Environment-friendly hydrochloric acid dosing device

Abstract

The utility model provides an environment-friendly hydrochloric acid dosing device which comprises a liquid storage tank, an acid mist absorber and a liquid outlet pipeline, the top of the liquid storage tank is provided with a breather valve and a hydrochloric acid inlet, the upper part of the liquid storage tank is provided with a second exhaust port, the lower part of the acid mist absorber is provided with an air inlet, and the second exhaust port is communicated with the air inlet through an exhaust valve. An alkali liquor inlet is formed in the upper portion of the acid mist absorber, a filler layer is arranged in the acid mist absorber and located above the air inlet and below the alkali liquor inlet, and a fourth liquor outlet valve is arranged at the position, away from the air inlet, of the lower portion of the acid mist absorber. The device is safe and environment-friendly, is suitable for an indoor closed environment, can efficiently absorb hydrochloric acid gas, prevents the hydrochloric acid gas from volatilizing into the air, polluting the air, harming the life safety of workers and prolonging the service life of other equipment, and meanwhile, is provided with an automatic liquid outlet pipeline, so that automatic dosing is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrochloric acid dosing, in particular to an environmentally friendly hydrochloric acid dosing device. Background Art

[0002] Hydrochloric acid is highly corrosive and volatile. In industrial production, in order to control the pressure in the hydrochloric acid storage tank, an air connection pipe is installed on the hydrochloric acid storage tank, which allows the acid mist containing hydrochloric acid gas to enter the production workshop through the air connection pipe. The acid mist will corrode human tissues, irreversibly damage the respiratory organs, eyes, skin and gastrointestinal tract, etc., affecting the life safety of operators. At the same time, it will also corrode other surrounding equipment and instruments, affecting the normal operation and service life of other equipment. The commonly used treatment method is to install an acid mist treatment system on the hydrochloric acid storage tank. For example, patent publication number CN212283474U, publication date January 5, 2021, the name of the invention is an acid mist treatment system for a hydrochloric acid storage tank in a sewage treatment plant, which discloses an acid mist treatment system for a hydrochloric acid storage tank, including a hydrochloric acid storage tank and a dissolution tank, the hydrochloric acid storage tank is provided with a feed pipe and an air connecting pipe, one side of the air connecting pipe is provided with a ventilation branch pipe, the dissolution tank has a water inlet end and a water outlet end, and a reducer is provided inside, and a connector is vertically provided on the small diameter section of the reducer to connect to the air connecting pipe. Its disadvantage is that industrial water is used to absorb acid mist, the absorption is incomplete, and the industrial water flow rate needs to be controlled to prevent the solution from overflowing and backflowing, and the operation is complicated. Utility Model Content

[0003] In order to solve the above-mentioned technical problems of low acid mist absorption efficiency and complex operation, the utility model provides an environmentally friendly hydrochloric acid dosing device, which can safely, environmentally friendly and efficiently realize the absorption and decomposition of acid mist, and the device has a simple structure and is easy to operate.

[0004] The specific technical scheme of the utility model is: an environmentally friendly hydrochloric acid dosing device, comprising a liquid storage tank, an acid mist absorber and a liquid outlet pipe, wherein a breathing valve and a hydrochloric acid liquid inlet are arranged on the top of the liquid storage tank, a second exhaust port is arranged on the upper part of the liquid storage tank, an air inlet is arranged on the lower part of the acid mist absorber, the second exhaust port is connected with the air inlet through an exhaust valve, an alkali liquid inlet is arranged on the upper part of the acid mist absorber, a packing layer is arranged inside the acid mist absorber, the packing layer is located above the air inlet and below the alkali liquid inlet, and a fourth liquid outlet valve is arranged on the lower part of the acid mist absorber away from the air inlet.

[0005] As the hydrochloric acid solution is added or stopped, the pressure inside the hydrochloric acid storage tank changes continuously. The breathing valve can automatically open or close according to the pressure difference between the tank and the outside pressure, so that the pressure inside and outside the tank is balanced, preventing the storage tank from becoming unstable and deforming due to the inconsistency between the internal pressure and the outside, and preventing the hydrochloric acid gas from escaping, protecting the safety of operators and equipment. The acid mist absorber adopts an acid-base neutralization structure, and an alkaline solution is stored inside. The hydrochloric acid gas enters from the bottom of the acid mist absorber and meets the alkaline solution, a neutralization reaction occurs, and the volatilized hydrochloric acid gas is fully absorbed and decomposed, thereby improving the absorption efficiency and ensuring that the hydrochloric acid gas is completely neutralized and absorbed. The waste liquid such as the salt solution produced by the reaction flows out from the fourth liquid outlet valve. The device has a simple structure, can absorb and decompose acid mist safely, environmentally friendly and efficiently, and can be widely used in industrial production.

[0006] Preferably, the filler layer is filled with hollow spherical fillers and / or hollow polyhedral fillers.

[0007] The acid mist absorber is provided with a packing layer, which adopts hollow spherical packing and / or hollow polyhedral packing. The packing can change the flow direction of the alkaline solution and hydrochloric acid gas, slow down the flow speed, make the hydrochloric acid gas and the alkaline solution fully merge, accelerate the reaction, and further improve the absorption efficiency.

[0008] Preferably, the hollow spherical filler and / or the hollow polyhedral filler is a porous filler.

[0009] The porous filler can increase the flow path of the alkaline solution, allowing it to stay in the filler layer longer, fully react with the hydrochloric acid gas, and completely absorb the hydrochloric acid gas.

[0010] Preferably, the lower part of the liquid storage tank is connected to the liquid outlet pipe through the liquid outlet, and the liquid outlet pipe includes a first liquid outlet valve, a metering pump, a check valve and an electric valve that switches synchronously with the metering pump. The first liquid outlet valve is located below the liquid outlet, the electric valve is located above the dosing outlet, and the metering pump and the check valve are sequentially arranged between the first liquid outlet valve and the electric valve.

[0011] The metering pump is driven by an external drive device, and the electric valve is controlled by the metering pump and is switched synchronously with the metering pump, so as to achieve the function of automatically adjusting the hydrochloric acid addition flow rate and realize the automatic discharge of hydrochloric acid. When the dosing stops, the metering pump and the electric valve are closed synchronously. Due to the sudden change in the liquid flow rate, the hydrochloric acid solution will flow back. At this time, the check valve is preferably used to limit the backflow of the hydrochloric acid solution. A buffer is connected to the position between the metering pump and the check valve in the liquid outlet pipeline, and a second liquid outlet valve is provided between the buffer and the liquid outlet pipeline. A pressure gauge is connected to the buffer.

[0012] The buffer system is installed in the outlet pipeline to prevent the hydraulic shock caused by the change of the hydrochloric acid solution flow rate from damaging the pipeline, and to avoid the pipeline shaking caused by the excessive flow rate of the hydrochloric acid solution. Since the buffer is filled with gas, the pressure in the buffer is monitored by installing a pressure gauge to determine whether the buffer can operate normally.

[0013] Preferably, a filter is provided in the liquid outlet pipeline, and the filter is located between the first liquid outlet valve and the metering pump.

[0014] Since there are impurities in the hydrochloric acid solution, a detachable filter is provided in the automatic liquid outlet pipeline to remove the impurities, which helps to improve the use efficiency of the hydrochloric acid.

[0015] Preferably, the liquid outlet pipeline is provided with a safety valve, and the safety valve inlet pipeline is arranged between the first liquid outlet valve and the filter.

[0016] The safety valve is used to protect the safety of the automatic liquid outlet pipeline. When the pressure in the pipeline is too high, it will be activated to reduce the pressure in the pipeline to normal value.

[0017] Preferably, the metering pump is provided with an external drive device, and the external drive device is driven by an external variable frequency motor or an electric stroke controller.

[0018] The metering pump is driven by an external drive device and receives signals from the PLC or host computer to change the flow rate.

[0019] Preferably, the metering pump is a digital metering pump with a 4-20mA signal.

[0020] The digital metering pump itself has a 4-20mA signal, and the host computer or PLC can directly control the metering pump to adjust the flow rate.

[0021] Preferably, a water inlet is provided at the top of the acid mist absorber, and an overflow port is provided above the packing layer.

[0022] There is an overflow port on the upper side of the acid mist absorber, which leads to the sewage pipe to prevent the backflow of alkali solution. When cleaning the acid mist absorber, add aqueous solution through the water inlet.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] 1. Safe and environmentally friendly, suitable for indoor closed environments. The hydrochloric acid storage tank is equipped with a breathing valve, which can automatically adjust the pressure inside the tank to balance the air pressure inside and outside the tank, protect the safety of the storage tank, and prevent acid mist from escaping, thereby ensuring the safety of the staff and the service life of other equipment.

[0025] 2. High acid mist treatment efficiency. The hydrochloric acid storage tank is equipped with an acid mist absorber. The acid mist absorber adopts an acid-base neutralization structure, with an additional filler layer inside and multi-faceted hollow ball fillers, which accelerates the reaction and fully integrates, improves the acid mist absorption efficiency, and ensures that the acid mist gas is completely absorbed.

[0026] 3. High degree of automation. The dosage of the metering pump is controlled by PLC or host computer, and the electric valve controlled by the metering pump is set to realize the fully automatic dosing function. It has on-site and remote control functions, and the safety and stability of the device are improved by configuring the safety valve and buffer system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a structural schematic diagram of an environmentally friendly hydrochloric acid dosing device.

[0028] Among them: 1-exhaust valve, 2-breathing valve, 3-hydrochloric acid inlet, 4-liquid storage tank, 5-liquid level meter, 6-first liquid outlet valve, 7-filter, 8-metering pump, 9-safety valve, 10-pressure gauge, 11-buffer, 12-second liquid outlet valve, 13-check valve, 14-electric valve, 15-dosing outlet, 16-third liquid outlet valve, 17-acid mist absorber, 18-drain outlet, 19-fourth liquid outlet valve, 20-first exhaust port, 21-first liquid inlet valve, 22-water inlet, 23-alkali solution inlet, 24-second liquid inlet valve, 25-overflow port, 26-packing layer, 27-air inlet, 28-second exhaust port, 29-liquid outlet. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with embodiments.

[0030] Overall embodiment

[0031] An environmentally friendly hydrochloric acid dosing device comprises a liquid storage tank 4, an acid mist absorber 17 and a liquid outlet pipe, wherein a breathing valve 2 and a hydrochloric acid inlet 3 are provided on the top of the liquid storage tank 4, a second exhaust port 28 is provided on the upper part of the liquid storage tank 4, an air inlet 27 is provided on the lower part of the acid mist absorber 17, the second exhaust port 28 is connected with the air inlet 27 through an exhaust valve 1, an alkali liquid inlet 23 is provided on the upper part of the acid mist absorber 17, a packing layer 26 is provided inside the acid mist absorber 17, the packing layer 26 is located above the air inlet 27 and below the alkali liquid inlet 23, and a fourth liquid outlet valve 19 is provided on the lower part of the acid mist absorber 17 away from the air inlet 27.

[0032] As a specific embodiment, the packing layer 26 is filled with hollow spherical packing and / or hollow polyhedral packing. The hollow spherical packing and / or hollow polyhedral packing are porous packing. The lower part of the liquid storage tank 4 is connected to the liquid outlet pipeline through the liquid outlet 29. The liquid outlet pipeline includes a first liquid outlet valve 6, a metering pump 8, a check valve 13 and an electric valve 14 that switches synchronously with the metering pump 8. The first liquid outlet valve 6 is located below the liquid outlet 29, and the electric valve 14 is located above the dosing outlet 15. The metering pump 8 and the check valve 13 are sequentially arranged between the first liquid outlet valve 6 and the electric valve 14. The liquid outlet pipeline is provided with a filter 7, and the filter 7 is located between the first liquid outlet valve 6 and the metering pump 8. The liquid outlet pipeline is provided with a safety valve 9, and the inlet pipeline of the safety valve 9 is arranged between the first liquid outlet valve 6 and the filter 7. The metering pump 8 has an external drive device, which is driven by an external variable frequency motor or an electric stroke controller. A water inlet 22 is provided on the upper portion of the acid mist absorber 17 , and an overflow port 25 is provided above the packing layer 16 . Specific embodiments

[0034] The present invention is described below by specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Without departing from the spirit and scope of the concept of the present invention, changes and advantages that can be thought of by those skilled in the art are included in the present invention, and the attached claims and any equivalents thereof are the protection scope of the present invention.

[0035] Unless otherwise defined, all technical terms and scientific terms used in this utility model have the same meanings as those commonly understood by ordinary technicians in the field to which the present disclosure belongs. Unless otherwise specified, the raw materials and equipment used in this utility model are conventional raw materials and equipment in the field and can be obtained from conventional commercial channels; unless otherwise specified, the methods used in this utility model are conventional methods in the field.

[0036] Example 1

[0037] This embodiment provides an environmentally friendly hydrochloric acid dosing device, referring to Figure 1It is understood that it includes a liquid storage tank 4, an acid mist absorber 17 and an automatic liquid outlet pipe. The top of the liquid storage tank 4 is provided with a hydrochloric acid inlet 3, a breathing valve 2 and an inspection port in parallel. The breathing valve 2 is arranged at the top of the liquid storage tank 4 between the hydrochloric acid inlet 3 and the inspection port. The breathing valve 2 is used to automatically adjust the pressure difference between the inside and outside of the liquid storage tank 4 to prevent the liquid storage tank 4 from becoming unstable and deformed due to the inconsistency between the internal pressure and the outside, and at the same time facilitate the pumping out of the hydrochloric acid solution through the dosing pump. The tank body of the liquid storage tank 4 is equipped with a liquid level gauge 5 to facilitate monitoring the liquid level of the solution in the tank. The upper part of the liquid storage tank 4 is provided with a second exhaust port 28, and the second exhaust port 28 is connected to the acid mist absorber air inlet 27 through the exhaust valve 1. The air inlet 27 is located at the lower part of the acid mist absorber 17. The acid mist absorber 17 is used to absorb and decompose the hydrochloric acid gas volatilized from the liquid storage tank 4. The top of the acid mist absorber 17 is provided with an alkali liquid inlet 23, a water inlet 22 and a first exhaust port 20 in parallel, and a second liquid inlet valve 24 and a first liquid inlet valve 21 are respectively provided between the alkali liquid inlet 23 and the water inlet 22 and the acid mist absorber 17, and the water inlet 22 is arranged at the top of the acid mist absorber between the alkali liquid inlet 23 and the first exhaust port 20, and the alkali liquid inlet 23 is used to add alkaline solution into the acid mist absorber 17, and the water inlet 22 is used to add aqueous solution into the acid mist absorber 17, and the first exhaust port 20 is used to discharge the gas in the acid mist absorber 17 to the outside to adjust the pressure in the acid mist absorber 17. The acid mist absorber 17 is also provided with an overflow port 25 near the top side to prevent the alkali liquid from flowing back. The bottom of the liquid storage tank 4 is connected to the sewage outlet 18 through the third liquid outlet valve 16, and the lower outlet of the acid mist absorber 17 is connected to the sewage outlet 18 through the fourth liquid outlet valve 19.

[0038] The liquid storage tank 4 is provided with a liquid outlet 29 near the bottom side, and the liquid outlet 29 is connected to the automatic liquid outlet pipeline through the first liquid outlet valve 6, and the terminal of the automatic liquid outlet pipeline is the dosing outlet 15. The automatic liquid outlet pipeline includes the first liquid outlet valve 6, the filter 7, the metering pump 8, the check valve 13, the electric valve 14 and the dosing outlet 15 connected in sequence. The automatic liquid outlet pipeline is also provided with a safety valve 9 for protecting the filter 7 and the metering pump 8. The inlet pipeline of the safety valve 9 is arranged between the first liquid outlet valve 6 and the filter 7, and the outlet pipeline of the safety valve 9 is arranged between the metering pump 8 and the check valve 13. The automatic liquid outlet pipeline is provided with a buffer system, and the buffer system includes a pressure gauge 10, a buffer 11 and a second liquid outlet valve 12 connected in sequence, and the buffer system is arranged between the metering pump 8 and the check valve 13. The buffer system is used to prevent the hydraulic shock caused by the change in the flow rate of the hydrochloric acid solution from damaging the pipeline, and at the same time avoid the pipeline shaking caused by the excessive flow rate of the hydrochloric acid solution.

[0039] This embodiment adopts a control system composed of a PLC, a metering pump 8 and an electric valve 14 to realize the automatic discharge of hydrochloric acid. The metering pump 8 is driven by an external variable frequency motor, and the frequency converter is controlled by the PLC control module to adjust the motor speed of the metering pump 8, thereby changing the number of reciprocating times of the metering pump 8. The electric valve 14 is controlled by the metering pump 8, and the switch of the electric valve 14 is consistent with the switch of the metering pump 8, thereby achieving the function of automatically adjusting the hydrochloric acid addition flow rate and realizing the automatic discharge of hydrochloric acid.

[0040] The working mode of this embodiment is as follows: hydrochloric acid solution is added into the liquid storage tank 4 through the hydrochloric acid inlet 3. With the addition of the hydrochloric acid solution, the hydrochloric acid gas in the liquid storage tank 4 is discharged from the gas outlet on the upper side. The hydrochloric acid gas enters the acid mist absorber 17 through the exhaust valve 1. Since the density of the hydrochloric acid gas is less than the density of the alkali solution, when the HCL in the hydrochloric acid gas is fully absorbed through the acid-base neutralization reaction, the remaining gas is discharged from the first exhaust port 20, and the salt solution produced by the reaction is discharged from the sewage outlet 18 through the fourth liquid outlet valve 19. The hydrochloric acid solution flows out from the liquid outlet 29 of the liquid storage tank 4 and enters the automatic liquid outlet pipeline, enters the filter 7 through the first liquid outlet valve 6 for filtration and impurity removal, and the hydrochloric acid solution after filtration is controlled by the metering pump to flow out at a suitable flow rate. A part of the hydrochloric acid solution enters the buffer system on the branch line to reduce the liquid outlet speed, and a part of the hydrochloric acid solution maintains the original flow rate and merges with the hydrochloric acid solution with reduced flow rate at the liquid outlet 29 of the buffer system, and then flows out to the dosing outlet 15 through the check valve 13 and the electric valve 14.

[0041] In the present embodiment, the acid mist absorber 17 adopts an acid-base neutralization structure, in which an alkaline solution is stored and a packing layer 26 is provided, and the hydrochloric acid gas volatilized is fully absorbed and decomposed by the acid-base neutralization reaction, and a certain number of porous hollow hexahedral fillers are placed in the internal packing layer 26. When the alkaline solution and the hydrochloric acid gas pass through the packing layer 26, the flow direction changes, the flow path becomes longer, and the flow speed slows down, thereby making the hydrochloric acid gas and the alkali solution fully merge and react faster, improving the absorption efficiency, and ensuring that the hydrochloric acid gas is completely absorbed. In addition, the top of the acid mist absorber 17 is provided with a first exhaust port 20, and the upper side is provided with an overflow port 25 to prevent the alkali solution from backflowing and secondary pollution of indoor air. When the hydrochloric acid gas in the liquid storage tank 4 continuously enters the acid mist absorber 17, the pressure in the liquid storage tank 4 continues to decrease, and when the operating negative pressure of the breathing valve 2 is reached, the breathing valve 2 is opened, and the outside air enters the tank, so that the pressure inside and outside the tank is balanced, and the safety of the liquid storage tank 4 is protected, and the breathing valve 2 can prevent the acid mist from escaping at the same time, and the life safety of the staff and the service life of other equipment are guaranteed. When the hydrochloric acid dosing equipment is cleaned and repaired, the third liquid outlet valve 16 can be opened to discharge waste liquid. Due to the presence of impurities in the hydrochloric acid solution, in order to ensure the purity of the dosing, it is necessary to filter, and the filter 7 is a detachable device. The safety valve 9 is used to protect the safety of the automatic liquid outlet pipeline. When the pressure in the pipeline is too high, it is activated to reduce the pressure in the pipeline to a normal value. During the automatic liquid discharge of hydrochloric acid, the hydrochloric acid flow in the pipeline will change. The buffer system is set to maintain the stability of the liquid discharge, and the buffer 11 is installed to reduce the liquid discharge speed of the hydrochloric acid solution. Since the buffer 11 is filled with gas, the pressure in the buffer 11 is monitored by installing a pressure gauge 10 to determine whether the buffer 11 can operate normally. When the dosing stops, the metering pump 8 and the electric valve 14 are closed synchronously. Due to the sudden change in the liquid flow rate, the hydrochloric acid solution will reflux. At this time, the check valve 13 limits the reflux of the hydrochloric acid solution. The exhaust valve 1 , the first liquid outlet valve 6 , the second liquid outlet valve 12 , the third liquid outlet valve 16 , the fourth liquid outlet valve 19 , the first liquid inlet valve 21 and the second liquid inlet valve 24 are all ball valves.

[0042] Example 2

[0043] The present embodiment proposes an environmentally friendly hydrochloric acid dosing device, including a liquid storage tank 4, an acid mist absorber 17 and an automatic liquid discharge pipeline. The structure and working method of the present embodiment are roughly the same as those of Example 1, and the only difference is that a stirring device is provided inside the acid mist absorber 17, and the stirring device is arranged on the center line of the acid mist absorber, and is composed of a motor, a stirring shaft and a U-shaped stirring part. When stirring, the contact area between the hydrochloric acid gas and the alkaline solution can be increased, and the acid-base neutralization reaction can be accelerated at the same time, so that the hydrochloric acid gas is fully absorbed. The acid mist absorber 17 is also provided with a temperature indicator for monitoring the temperature inside the acid mist absorber to prevent the acid mist absorber from being too high and affecting the stirring of the stirring device. The present embodiment adopts a host computer, a metering pump 8 and an electric valve 14 to form a control system to realize the automatic liquid discharge of hydrochloric acid. The metering pump 8 is driven by an external variable frequency motor, and the frequency converter is controlled by the host computer control module to adjust the motor speed of the metering pump 8, thereby changing the number of reciprocating times of the metering pump 8. The electric valve 14 is controlled by the metering pump 8, and the switch of the electric valve 14 is consistent with the switch of the metering pump 8, thereby achieving the function of automatically adjusting the hydrochloric acid addition flow rate and realizing automatic discharge of hydrochloric acid.

[0044] Example 3

[0045] This embodiment proposes an environmentally friendly hydrochloric acid dosing device, including a liquid storage tank 4, an acid mist absorber 17 and an automatic liquid outlet pipe. The structure and working method of this embodiment are roughly the same as those of Example 1, and the only difference is that: an alkali liquid spraying device is provided inside the acid mist absorber 17, and the alkali liquid spraying device is located at the top of the inner cavity of the acid mist absorber, and is composed of a spray rod connecting a first spray port, a second spray port and a third spray port, and each spray port opens toward the bottom of the acid mist absorber and is spaced at equal intervals. The use of a spraying method to add an alkali solution can make the acid mist gas at the top of the inner cavity of the acid mist absorber fully contact with the alkali solution, thereby improving the absorption efficiency of the hydrochloric acid gas and preventing the presence of untreated hydrochloric acid gas from being discharged from the first exhaust port 20 of the acid mist absorber to pollute the indoor air. In this embodiment, an acid mist leak detector is installed in the dosing room where the hydrochloric acid dosing device is located. The acid mist leak detector can perform continuous online detection of hydrochloric acid gas in the air. If it is found that the hydrochloric acid gas content in the air exceeds the set value, an audible and visual alarm will be issued. The device has an early warning effect on on-site gas leakage, so that leakage can be handled in time, personnel can be evacuated, and the life safety and property safety of on-site operators can be protected.

[0046] Example 4

[0047] This embodiment proposes an environmentally friendly hydrochloric acid dosing device, including a liquid storage tank 4, an acid mist absorber 17 and an automatic liquid discharge pipeline. The structure and working mode of this embodiment are roughly the same as those of Example 1, and the only difference is that: this embodiment adopts an acid mist absorber 17 provided with a packing layer 26, and the internal packing layer 26 is filled with a certain number of porous hollow spherical fillers; PLC, metering pump 8 and electric valve 14 form a control system to realize the automatic discharge of hydrochloric acid. The metering pump 8 is controlled by an external electric stroke controller, which automatically adjusts the stroke length of the metering pump by receiving the signal sent by the PLC control module. The electric valve 14 is controlled by the metering pump 8, and the switch of the electric valve 14 is consistent with the switch of the metering pump 8, so as to achieve the function of automatically adjusting the hydrochloric acid addition flow rate and realize the automatic discharge of hydrochloric acid. The electric valve 14 is provided with a manual valve operation bypass, which is convenient for equipment maintenance without stopping when the electric valve fails or is damaged.

[0048] Example 5

[0049] This embodiment proposes an environmentally friendly hydrochloric acid dosing device, including a liquid storage tank 4, an acid mist absorber 17 and an automatic liquid discharge pipeline. The structure and working method of this embodiment are roughly the same as those of Example 2, and the only difference is that this embodiment adopts a host computer, a metering pump 8 and an electric valve 14 to form a control system to achieve automatic liquid discharge of hydrochloric acid. The metering pump 8 is controlled by an external electric stroke controller, which automatically adjusts the stroke length of the metering pump by receiving a signal from the host computer. The electric valve 14 is controlled by the metering pump 8, and the switch of the electric valve 14 is consistent with the switch of the metering pump 8, thereby achieving the function of automatically adjusting the hydrochloric acid addition flow rate and realizing automatic liquid discharge of hydrochloric acid. The electric valve 14 is provided with a pneumatic valve operation bypass, which is convenient for equipment maintenance without stopping when the electric valve fails or is damaged.

[0050] Example 6

[0051] This embodiment proposes an environmentally friendly hydrochloric acid dosing device, including a liquid storage tank 4, an acid mist absorber 17 and an automatic liquid discharge pipeline. The structure and working mode of this embodiment are roughly the same as those of Example 1, and the only difference is that this embodiment adopts a PLC, a metering pump 8 and an electric valve 14 to form a control system to achieve automatic liquid discharge of hydrochloric acid. The metering pump 8 adopts a digital metering pump, which itself has a 4-20mA signal. By receiving the instruction issued by the PLC, it adjusts its own motor speed. The electric valve 14 is controlled by the metering pump 8, and the switch of the electric valve 14 is consistent with the switch of the metering pump 8, so as to achieve the function of automatically adjusting the hydrochloric acid addition flow rate and realize automatic liquid discharge of hydrochloric acid. In order to ensure the effect of hydrochloric acid solution addition, the dosing outlet 15 is connected to the dosing pump, and a safety valve is installed on the outlet pipe of the dosing pump. The dosing pump is a double diaphragm metering pump. When a diaphragm is broken, the device will send an alarm signal to remind the staff to start the standby pump and repair the fault in time. The advantage of using a double diaphragm metering pump is that it has two diaphragms. When one diaphragm ruptures, the other diaphragm still exists to separate the hydraulic oil in the pump body from the hydrochloric acid solution, preventing the hydrochloric acid solution from being contaminated.

[0052] The raw materials and equipment used in the present invention, unless otherwise specified, are all commonly used raw materials and equipment in the field; the methods used in the present invention, unless otherwise specified, are all conventional methods in the field.

[0053] The above description is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent transformation made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. An environmentally friendly hydrochloric acid dosing device, characterized in that: It includes a liquid storage tank, an acid mist absorber and a liquid outlet pipe. The top of the liquid storage tank is provided with a breathing valve and a hydrochloric acid inlet, the upper part of the liquid storage tank is provided with a second exhaust port, the lower part of the acid mist absorber is provided with an air inlet, the second exhaust port is connected with the air inlet through an exhaust valve, the upper part of the acid mist absorber is provided with an alkali solution inlet, a packing layer is provided inside the acid mist absorber, the packing layer is located above the air inlet and below the alkali solution inlet, and a fourth liquid outlet valve is provided at the lower part of the acid mist absorber away from the air inlet.

2. An environmentally friendly hydrochloric acid dosing device according to claim 1, characterized in that: The packing layer is filled with hollow spherical packing and / or hollow polyhedral packing.

3. An environmentally friendly hydrochloric acid dosing device according to claim 2, characterized in that: The hollow spherical filler and / or the hollow polyhedral filler is a porous filler.

4. An environmentally friendly hydrochloric acid dosing device according to claim 1, characterized in that: The lower part of the liquid storage tank is connected to the liquid outlet pipeline through the liquid outlet. The liquid outlet pipeline includes a first liquid outlet valve, a metering pump, a check valve and an electric valve that switches synchronously with the metering pump. The first liquid outlet valve is located below the liquid outlet, the electric valve is located above the dosing outlet, and the metering pump and the check valve are sequentially arranged between the first liquid outlet valve and the electric valve.

5. An environmentally friendly hydrochloric acid dosing device according to claim 4, characterized in that: A buffer is connected to a position between the metering pump and the check valve in the liquid outlet pipeline, a second liquid outlet valve is arranged between the buffer and the liquid outlet pipeline, and a pressure gauge is connected to the buffer.

6. An environmentally friendly hydrochloric acid dosing device according to claim 4 or 5, characterized in that: A filter is arranged in the liquid outlet pipeline, and the filter is located between the first liquid outlet valve and the metering pump.

7. An environmentally friendly hydrochloric acid dosing device according to claim 6, characterized in that: A safety valve is arranged in the liquid outlet pipeline, and an inlet pipeline of the safety valve is arranged between the first liquid outlet valve and the filter.

8. An environmentally friendly hydrochloric acid dosing device according to claim 4, characterized in that: The metering pump is provided with an external drive device, which is driven by an external variable frequency motor or an electric stroke controller.

9. An environmentally friendly hydrochloric acid dosing device according to claim 4, characterized in that: The metering pump is a digital metering pump with a 4-20mA signal.

10. The environmentally friendly hydrochloric acid dosing device according to claim 1, characterized in that: A water inlet is arranged on the upper part of the acid mist absorber, and an overflow port is arranged above the packing layer.

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