Automatic dilute acid preparation device

Abstract

The utility model relates to the field of ionic membrane alkali production industry, and provides an automatic dilute acid preparation device, which solves the problems of salt water concentration reduction and pipeline crystallization caused by design defects of the existing electrolysis device, and comprises a desalting water tank, a hydrochloric acid tank and an electrolytic acid metering tank, the desalting water tank is connected with a water delivery pipe, and the hydrochloric acid tank is connected with an acid delivery pipe. The device further comprises a mixer, the other end of the water conveying pipe and the other end of the acid conveying pipe are connected with the mixer, desalted water in the desalted water tank and hydrochloric acid in the hydrochloric acid tank are mixed in the mixer according to a set proportion, the mixer is connected with a mixing pipe, and the mixing pipe is connected with the acid conveying pipe. The mixing pipe is connected with the electrolytic acid metering tank, one side of the mixing pipe is connected with a sodium sulfite pipeline, the prepared low-concentration hydrochloric acid is adopted, the situation of blockage caused by crystallization in the electrolytic acid metering tank can be effectively reduced, and the service life of the electrolytic acid metering tank is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of ion membrane alkali making industry, in particular to an automatic dilute acid preparation device. Background Art

[0002] Chinese patent publication number CN218647541U discloses a physical device for electrolysis process testing and training, including: a simulated brine source; a simulated steam source; a brine heater, connected to the simulated brine source and the simulated steam source through a pipeline; a resin tower connected to the brine outlet of the brine heater; a refined brine storage tank connected to the outlet of the resin tower; a refined brine pump; a circulating water tank; a simulated hydrochloric acid source; an electrolytic cell connected to the refined brine pump, the circulating water tank and the simulated hydrochloric acid source at the same time; an anode gas-liquid separator connected to the anode chamber of the electrolytic cell; a chlorine discharge pipeline connected to the gas outlet of the anode gas-liquid separator; a cathode gas-liquid separator connected to the cathode chamber of the electrolytic cell; a hydrogen discharge pipeline connected to the gas outlet of the cathode gas-liquid separator; an alkali liquid circulation tank connected to the liquid outlet of the cathode gas-liquid separator; an alkali liquid circulation pump connected to the outlet of the alkali liquid circulation tank; an alkali liquid cooler connected to the alkali liquid circulation pump, and the outlet of the alkali liquid cooler is connected to the electrolytic cell; a sodium hydroxide discharge pipeline connected to the alkali liquid circulation pump.

[0003] The device proposed by the utility model has the same structure as the industrial electrolysis device. During the production process, hydrochloric acid needs to be added to the anode chamber for control. Adding acid can make the chlorine gas purer and reduce the content of chlorate and sodium hypochlorite in the light salt water, reduce the corrosion to the anode, and extend the service life of the electrolytic cell. The hydrochloric acid of the original industrial electrolysis device uses high-concentration hydrochloric acid (industrial hydrochloric acid concentration is usually 30%-36%) directly produced from the acid preparation device, which is directly passed to the industrial electrolysis device. However, because the solubility of salt in hydrochloric acid is very low, high-concentration hydrochloric acid will cause salt to precipitate from the brine, causing the concentration of the brine to decrease, resulting in a decrease in electrolysis efficiency. At the same time, a common ion effect will occur, causing the pipeline to crystallize and causing ion membrane blockage. Utility Model Content

[0004] Therefore, in view of the above problems, the utility model provides an automatic dilute acid preparation device to solve the problem of reduced brine concentration and pipeline crystallization caused by design defects in existing electrolysis devices.

[0005] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0006] An automatic dilute acid configuration device comprises a desalted water tank, a hydrochloric acid tank and an electrolytic acid metering tank, wherein the desalted water tank is connected to a water pipe, the hydrochloric acid tank is connected to an acid pipe, both the water pipe and the acid pipe are provided with flow meters, and further comprises a mixer, the other ends of the water pipe and the acid pipe are connected to the mixer, the desalted water in the desalted water tank and the hydrochloric acid in the hydrochloric acid tank are mixed in the mixer according to a set ratio, the mixer is connected to a mixing tube, the mixing tube is connected to the electrolytic acid metering tank, and one side of the mixing tube is connected to a sodium sulfite pipeline.

[0007] Furthermore, the concentration of hydrochloric acid in the hydrochloric acid tank is 30%-32%, and the concentration of hydrochloric acid introduced into the electrolytic acid metering tank is 17%-19%.

[0008] Furthermore, the hydrochloric acid tank and the electrolytic acid metering tank are both provided with liquid level gauges, and the acid delivery pipe is provided with a regulating valve.

[0009] Furthermore, the hydrochloric acid tank is connected to an acid preparation device, and when the liquid level in the electrolytic acid metering tank reaches a high level, the acid preparation device automatically stops.

[0010] Furthermore, a hydrochloric acid pump is provided on the acid delivery pipe, and when the liquid level in the electrolytic acid metering tank reaches a high level, the hydrochloric acid pump directly changes frequency to reduce the outlet pressure.

[0011] Furthermore, the free chlorine in the hydrochloric acid introduced into the electrolytic acid metering tank is less than 20 ppm.

[0012] Furthermore, the concentration of sodium sulfite in the sodium sulfite pipeline is 9%-11%.

[0013] Furthermore, a hydrochloric acid concentration meter is provided on the mixing tube.

[0014] Furthermore, the flow ratio in the water pipe and the acid pipe is 1.2:1-1.3:1.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The low-concentration hydrochloric acid prepared in the utility model can effectively reduce the blockage caused by crystallization in the electrolytic acid metering tank and extend the service life of the electrolytic acid metering tank.

[0017] 2. The utility model provides a flow meter and a regulating valve, and controls the acid distribution according to a set ratio, so there is no need to repeatedly adjust the acid concentration to control it, thereby reducing the workload of manual operation.

[0018] 3. The utility model introduces sodium sulfite into one side of the mixing tube, so as to dilute the hydrochloric acid and sodium chloride in the mixer to increase the solubility, and then remove the chloride ions from the mixed solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model.

[0020] Description of Figure Numbers

[0021] Desalted water tank 1; hydrochloric acid tank 2; electrolytic acid metering tank 3; water pipe 4; acid pipe 5, the water pipe 4 and the acid pipe 5; flow meter 6; mixer 7; mixing pipe 8; sodium sulfite pipeline 9; regulating valve 10; hydrochloric acid pump 11; acid preparation device 12. DETAILED DESCRIPTION

[0022] The following will describe the implementation methods of the present invention in detail in conjunction with specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0023] Example

[0024] like Figure 1 As shown, an automatic dilute acid configuration device includes a desalted water tank 1, a hydrochloric acid tank 2 and an electrolytic acid metering tank 3, wherein the desalted water tank 1 is connected to a water pipe 4, the hydrochloric acid tank 2 is connected to an acid pipe 5, both of which are provided with a flow meter 6, and further includes a mixer 7, the other ends of the water pipe 4 and the acid pipe 5 are connected to the mixer 7, the desalted water in the desalted water tank 1 and the hydrochloric acid in the hydrochloric acid tank 2 are mixed in the mixer 7 by setting a ratio, the mixer 7 is connected to a mixing tube 8, a hydrochloric acid concentration meter 13 is provided on the mixing tube 8, the mixing tube 8 is connected to the electrolytic acid metering tank 3, and one side of the mixing tube 8 is connected to a sodium sulfite pipeline 9;

[0025] The hydrochloric acid tank 1 and the electrolytic acid metering tank 3 are both provided with liquid level gauges (not shown in the figure), and the acid delivery pipe 5 is provided with a regulating valve 10; the acid delivery pipe 5 is provided with a hydrochloric acid pump 11, and the hydrochloric acid tank 2 is connected to an acid preparation device 12. When the liquid level gauge in the electrolytic acid metering tank 3 detects that the liquid level reaches a high level, the hydrochloric acid pump 11 directly changes frequency to reduce the outlet pressure, and the acid preparation device 12 automatically stops. At this time, the regulating valve 10 cooperates with the frequency conversion of the hydrochloric acid pump 11 to adjust the flow in the acid delivery pipe 5 to ensure that the flow ratio between the water delivery pipe 4 and the acid delivery pipe 5 remains unchanged, wherein the flow in the water delivery pipe 4 remains unchanged at the set value;

[0026] Among them, the flow meter 6, liquid level meter, regulating valve 10 and hydrochloric acid pump 11 can all be purchased from the market, the mixer 7 adopts a Venturi mixer, and the electrolytic acid metering tank is a conventional electrolysis equipment. The above equipment is anti-corrosion equipment and is a conventional technical means, which will not be repeated here;

[0027] In this embodiment, the concentration of hydrochloric acid in the hydrochloric acid tank 2 is 31%, and the concentration of hydrochloric acid introduced into the electrolytic acid metering tank 3 is 18%; the concentration of sodium sulfite in the sodium sulfite pipeline 9 is 10%; the flow ratio in the water pipe 4 and the acid pipe 5 is 1.28:1; the free chlorine in the hydrochloric acid introduced into the electrolytic acid metering tank 3 is less than 20ppm;

[0028] The use of prepared low-concentration hydrochloric acid can effectively reduce the occurrence of blockage caused by crystallization in the electrolytic acid metering tank 3, thereby extending the service life of the electrolytic acid metering tank 3; by setting the flow meter 6 and the regulating valve 10, and controlling the acid preparation according to the set ratio, there is no need to repeatedly adjust the acid concentration to control it, thereby reducing the workload of manual operation;

[0029] The method for preparing hydrochloric acid by the acid preparation device 12 is: chlorine and hydrogen are burned to synthesize hydrogen chloride in a hydrochloric acid synthesis furnace (not shown in the figure), and then pure water is used to absorb gaseous hydrogen chloride to obtain qualified hydrochloric acid with a mass fraction of 31% and pass it into the hydrochloric acid tank 2. Since chlorine is the main preparation raw material, the hydrochloric acid in the hydrochloric acid tank 2 often contains a small amount of free chlorine, also known as free effective chlorine or free effective residual chlorine, which exists in the form of dissolved elemental chlorine or hypochlorous acid and hypochlorite ion and has strong oxidizing property. If the free chlorine content exceeds the standard, it will cause the pressure in the hydrochloric acid furnace to increase, resulting in the tail gas emission of the hydrochloric acid synthesis furnace not meeting the standard, affecting the production of the entire chlor-alkali industry. By passing sodium sulfite on one side of the mixing pipe 8, it is convenient to dilute the hydrochloric acid and sodium chloride in the mixer 7 to increase the solubility, and then remove the chloride ions from the mixed solution to avoid safety hazards.

[0030] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An automatic dilute acid preparation device, comprising a desalted water tank, a hydrochloric acid tank and an electrolytic acid metering tank, characterized in that: The desalted water tank is connected to a water pipe, the hydrochloric acid tank is connected to an acid pipe, both the water pipe and the acid pipe are provided with flow meters, and also includes a mixer, the other ends of the water pipe and the acid pipe are connected to the mixer, the desalted water in the desalted water tank and the hydrochloric acid in the hydrochloric acid tank are mixed in the mixer according to a set ratio, the mixer is connected to a mixing tube, the mixing tube is connected to the electrolytic acid metering tank, and one side of the mixing tube is connected to a sodium sulfite pipeline.

2. The automatic dilute acid preparation device according to claim 1, characterized in that: The concentration of hydrochloric acid in the hydrochloric acid tank is 30%-32%, and the concentration of hydrochloric acid introduced into the electrolytic acid metering tank is 17%-19%.

3. The automatic dilute acid preparation device according to claim 1, characterized in that: The hydrochloric acid tank and the electrolytic acid metering tank are both provided with liquid level gauges, and the acid delivery pipe is provided with a regulating valve.

4. The automatic dilute acid preparation device according to claim 3, characterized in that: The hydrochloric acid tank is connected to an acid dispensing device, and when the liquid level in the electrolytic acid metering tank reaches a high level, the acid dispensing device automatically stops.

5. The automatic dilute acid preparation device according to claim 3, characterized in that: The acid delivery pipe is provided with a hydrochloric acid pump. When the liquid level in the electrolytic acid metering tank reaches a high level, the hydrochloric acid pump directly changes frequency to reduce the outlet pressure.

6. The automatic dilute acid preparation device according to claim 1, characterized in that: The free chlorine in the hydrochloric acid introduced into the electrolytic acid metering tank is less than 20 ppm.

7. The automatic dilute acid preparation device according to claim 1, characterized in that: The sodium sulfite concentration in the sodium sulfite pipeline is 9%-11%.

8. The automatic dilute acid preparation device according to claim 1, characterized in that: The mixing tube is provided with a hydrochloric acid concentration meter.

9. The automatic dilute acid preparation device according to claim 1, characterized in that: The flow ratio in the water pipe and the acid pipe is 1.2:1-1.3:1.

Images