Device for controlling concentration of by-product hydrochloric acid of R142B production device

Abstract

The utility model relates to the technical field of hydrochloric acid production, in particular to a device for controlling the concentration of by-product hydrochloric acid of an R142B production device, which comprises a water inlet tank, a water washing tower, a hydrochloric acid collecting tank, an alkaline washing tower and a control module. The gas outlet end of the water washing tower is connected with the alkaline washing tower through a gas outlet pipe, the water inlet tank is connected with the water inlet end of the water washing tower through a water inlet pipe, the water outlet end of the water washing tower is connected with the hydrochloric acid collecting tank through a water outlet pipe, and a liquid level meter, a temperature sensor, a pressure sensor and a heater are installed in the water washing tower. And flow regulating valves are arranged on the air inlet pipe and the air outlet pipe. According to the device disclosed by the utility model, the environment in the water washing tower is controlled by adjusting the pressure intensity, the temperature and the water inflow, so that the target concentration of the hydrochloric acid solution in the water washing tower is controlled to be the saturation concentration in the environment, and the concentration of the byproduct hydrochloric acid of the R142B production device is further accurately controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrochloric acid production, and more specifically to a device for controlling the concentration of by-product hydrochloric acid in an R142B production device. Background Art

[0002] R142B, also known as difluorochloroethane, can be used as a refrigerant and foaming agent and is a very important organic intermediate. Furthermore, R142B can also be used to produce VDF (vinylidene fluoride), which is an important raw material for lithium batteries. Therefore, R142B is also an important raw material in the new energy industry. Currently, when R142B is produced, its production process involves photochlorination of R152a (difluoromethane) and chlorine. While R152a and chlorine undergo photochlorination to produce R142B gas, they also produce hydrochloric acid gas as a byproduct. To avoid waste, the hydrochloric acid gas obtained in the R142B production process is generally sold as a hydrochloric acid solution, which can generate more revenue while also avoiding resource waste.

[0003] Commercially available hydrochloric acid solutions must have a concentration of at least 31%; otherwise, they must be treated as waste acid. Currently, hydrochloric acid gas, a byproduct of the R142B production process, is mostly separated and liquidized using water scrubbing. After passing through a water scrubber, the hydrochloric acid gas dissolves in water, forming a hydrochloric acid solution, while the R142B gas remains insoluble in water and continues to flow. The concentration of the hydrochloric acid solution obtained by the water scrubbing method increases with aeration time. To obtain a hydrochloric acid solution of the target concentration, the solution must be sampled and analyzed regularly. This is not only time-consuming and laborious, but the samples collected are not necessarily representative, making them prone to errors and resulting in inaccurate results. This makes it difficult to control the concentration of the hydrochloric acid byproduct produced by the R142B production plant. Utility Model Content

[0004] The purpose of the utility model is to overcome the problem in the prior art that it is difficult to accurately control the concentration of by-product hydrochloric acid in an R142B production device, and to provide a control device for the concentration of by-product hydrochloric acid in an R142B production device, which can accurately control the concentration of by-product hydrochloric acid in an R142B production device and obtain a hydrochloric acid solution of a target concentration.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] Provided is a control device for the concentration of by-product hydrochloric acid of an R142B production device, comprising a water scrubber, a water inlet tank, a hydrochloric acid collecting tank, an alkali scrubber and a control module, wherein the air inlet end of the water scrubber is connected to an air inlet pipe, the other end of the air inlet pipe is used to connect to the air outlet end of the R142B production device, the air outlet end of the water scrubber and the alkali scrubber are connected through an air outlet pipe, the water inlet tank and the water inlet end of the water scrubber are connected through a water inlet pipe, the water outlet end of the water scrubber and the hydrochloric acid collecting tank are connected through a water outlet pipe, a liquid level meter, a temperature sensor and a pressure sensor are installed in the water scrubber, and a liquid level meter is installed in the water scrubber. A heater is used to heat the water outlet chamber of the water washing tower, and flow regulating valves are provided on the air inlet pipe and the air outlet pipe. The liquid level meter is connected to the control module to input the water level signal in the water washing tower; the temperature sensor is connected to the control module to input the temperature signal in the water washing tower; the control module is connected to the heater to control the operation of the heater; the pressure sensor is connected to the control module to input the pressure signal in the water washing tower; the control module is connected to the flow regulating valves on the air inlet pipe and the air outlet pipe to control the opening of the flow regulating valve.

[0007] The utility model discloses a control device for the concentration of hydrochloric acid by-product of an R142B production device. When the device is in operation, the device first calculates the total amount of hydrochloric acid gas that can be obtained after the R142B production device is completed according to the production efficiency and material input of the R142B production device, then calculates the target water injection volume in the water scrubber according to the concentration of the target hydrochloric acid solution and the total amount of hydrochloric acid gas, and determines the ambient temperature and pressure when the target concentration is the saturation concentration of the hydrochloric acid solution. After obtaining the target water injection volume, target temperature and pressure, the water scrubber is injected with water and the temperature and pressure of the water scrubber cavity are adjusted according to the target water injection volume, target temperature and pressure. When the water scrubber is injected with water, the water inlet pipe is opened, and the water flow in the water inlet trough is injected into the water injection cavity of the water scrubber along the water inlet pipe. The control module receives the water level signal from the liquid level gauge. When the liquid level gauge in the water scrubber monitors that the water level in the water scrubber reaches the target water injection volume, the liquid level gauge sends the water level signal at this time to the control module. After receiving the signal, the control module closes the water inlet pipe and stops injecting water. At this time, the control module sends a working signal to the heater. After receiving the signal, the heater starts working and heats the water in the water storage chamber of the water scrubber. At the same time, the temperature sensor monitors the temperature in the water storage chamber in real time and sends the water temperature information to the control module. When the temperature in the water scrubber is detected to have reached the target temperature, the control module controls the heater to stop working. The control module then sends a working signal to the flow regulating valves on the air inlet and outlet pipes to adjust their openings so that when the air outlet of the R142B production device injects gas into the water scrubber through the air inlet pipe, the air flow through the R142B production device changes the pressure in the water scrubber. At this time, the pressure sensor monitors the pressure in the water scrubber in real time and transmits the pressure information to the control module. After the control module receives the pressure signal from the pressure sensor that the pressure in the water scrubber cavity has reached the target pressure, the R142B production device can normally inject gas into the water scrubber through the air inlet pipe. When the R142B production unit injects gas into the water scrubber through the air inlet pipe, the water scrubber washes the airflow with water, and the hydrochloric acid gas in the airflow dissolves in water to form a hydrochloric acid solution. The R142B gas and the hydrochloric acid gas that has not yet dissolved in water flow out along the outlet pipe and enter the alkali scrubber. Then, the excess hydrochloric acid gas is neutralized in the alkali scrubber, and the R142B gas flows out from the outlet end of the alkali scrubber. Since the temperature and pressure in the water scrubber are both the preset temperature and pressure, after the R142B production unit completes production under these temperature and pressure conditions, the saturation concentration of the hydrochloric acid solution in the water scrubber is the target hydrochloric acid solution concentration. When the solubility of hydrochloric acid needs to be adjusted, the saturation concentration of the solution in the water scrubber can be adjusted by re-changing the water injection volume, temperature, and pressure in the water scrubber. After the R142B production unit completes production, the hydrochloric acid solution in the water washing tower also reaches the target concentration. At this time, the outlet pipe is opened, and the hydrochloric acid solution in the water washing tower is injected into the hydrochloric acid collection tank along the outlet pipe. After the hydrochloric acid solution in the water washing tower is discharged, the outlet pipe is closed and the inlet pipe is reopened to produce the hydrochloric acid solution for the second time.

[0008] This solution's hydrochloric acid concentration control device, a byproduct of the R142B production unit, controls the environment within the water scrubber by adjusting pressure, temperature, and water inflow. This control ensures that the target hydrochloric acid concentration is the saturated concentration within the scrubber. This allows for precise control of the concentration of the hydrochloric acid produced by the R142B production unit. To achieve different concentrations of hydrochloric acid solution, simply adjust the temperature, pressure, and water inflow, resulting in a simple and convenient adjustment method.

[0009] Furthermore, the water inlet end of the water scrubber is located at the top of the water storage chamber in the water scrubber, and the water outlet end of the water scrubber is located at the bottom of the water storage chamber in the water scrubber; the air inlet end of the water scrubber is located at the bottom of the water storage chamber in the water scrubber, and the air outlet end of the water scrubber is located at the top of the water scrubber. The water inlet end of the water scrubber is located at the top of the water storage chamber in the water scrubber, so as to prevent the water from flowing out along the water inlet end after the water injection is completed. The water outlet end of the water scrubber is located at the bottom of the water storage chamber in the water scrubber, so as to facilitate the water flow in the water scrubber to flow out of the water storage chamber. The air inlet end of the water scrubber is located at the bottom, and the air outlet end is located at the top, so that the air flow entering the water scrubber can fully contact the water flow in the water storage chamber, and the water washing effect on the hydrochloric acid gas is better.

[0010] Furthermore, the heater is a heating rod located on the inner wall of the water storage chamber of the water scrubber. The heating rod has good heating effect, is compact, and has a long service life. Multiple heating rods are provided, and the plurality of heating rods are arranged in an array on the inner wall of the water storage chamber of the water scrubber.

[0011] Furthermore, the water scrubber is equipped with a water-washing circulation pump for lifting the liquid within the water scrubber into its inner cavity. The two ends of the water-washing circulation pump are connected to the bottom and top of the inner cavity of the water scrubber, respectively. The water-washing circulation pump can lift the liquid within the water storage cavity of the water scrubber from the top of the water scrubber, allowing the liquid to fall back into the water storage cavity of the water scrubber. During the process of the liquid being lifted and then falling, the contact area between the hydrochloric acid gas and the liquid is further increased, allowing the hydrochloric acid gas to be fully absorbed.

[0012] Furthermore, the water level in the inner cavity of the water scrubber is 50%-70% of its inner cavity height, so that the liquid raised by the water scrubbing circulation pump has a sufficiently long path to contact the hydrochloric acid gas in the air flow to form a hydrochloric acid solution.

[0013] Furthermore, the water scrubber includes a first water scrubber and a second water scrubber, wherein the air inlet of the first water scrubber is connected to the air inlet pipe, the air outlet of the second water scrubber is connected to the alkali scrubber via the air outlet pipe, the air inlet of the first water scrubber and the air outlet of the second water scrubber are connected via an air guide pipe, and the air guide pipe is provided with a flow regulating valve; the water outlet of the first water scrubber is connected to the water outlet pipe, the water inlet of the second water scrubber is connected to the water inlet pipe, and the water inlet of the first water scrubber and the water outlet of the second water scrubber are connected via a water guide pipe. The two water scrubbers are provided so that the second water scrubber can absorb hydrochloric acid gas not absorbed by the first water scrubber, thereby reducing the loss of hydrochloric acid gas. When injecting water, the water pipe and the water inlet pipe are opened simultaneously, and the water inlet tank simultaneously injects water into the first and second water washing towers. When discharging the hydrochloric acid solution, the water outlet pipe is first opened to discharge the hydrochloric acid solution in the first water washing tower into the hydrochloric acid collection tank, and then the water outlet pipe is closed. The water pipe and the water inlet pipe are opened to allow the water in the water inlet tank to flow into the second water washing tower and the first water washing tower, and the water in the second water washing tower to flow into the first water washing tower. When adjusting the pressure in the water washing tower, the opening of the flow regulating valves on the air inlet pipe, the air guide pipe, and the air outlet pipe is changed, so that the opening of the three flow regulating valves is reduced in sequence until the target pressure is reached in both the first and second water washing towers.

[0014] Furthermore, the outlet pipe is equipped with a gas-liquid separator for removing liquid from the airflow. A flow guide tube is located at the bottom of the gas-liquid separator, connecting to the inner cavity of the second water scrubber. The gas-liquid separator can further remove water vapor from the airflow, purifying the R142B gas. The collected water vapor is then transferred to the inner cavity of the second water scrubber via the flow guide tube, further avoiding waste.

[0015] Furthermore, a first valve is installed on the water inlet pipe, located at one end of the water inlet pipe near the water inlet trough; a second valve is installed on the water conduit, located at one end of the water conduit near the second water scrubber; and a third valve is installed on the water outlet pipe, located at one end of the water outlet pipe near the first water scrubber. The valve configuration allows operators to open and close the pipeline through the valve. The valve can be configured as a remote control valve such as a solenoid valve, allowing operators to remotely control the opening and closing of the valve, further reducing their workload.

[0016] Furthermore, a first water pump is installed on the water inlet pipe, located at one end of the water inlet pipe near the second water scrubber; a second water pump is installed on the water conduit, located at one end of the water conduit near the first water scrubber; and a third water pump is installed on the water outlet pipe, located at one end of the water outlet pipe near the hydrochloric acid collection tank. Installing water pumps on the water pipes allows for rapid and efficient water transfer. The pumps are closer to the outlet than the pipes, preventing water flow from impacting the pump after the valve is closed, thus extending the pump's service life.

[0017] Furthermore, the outlet of the water inlet trough is located above the water inlet of the second water scrubber; the outlet of the second water scrubber is located above the water inlet of the first water scrubber; and the outlet of the first water scrubber is located above the hydrochloric acid collection tank. The outlet of the water inlet trough, the water inlet of the second water scrubber, the outlet of the second water scrubber, the water inlet of the first water scrubber, the outlet of the first water scrubber, and the hydrochloric acid collection tank are arranged in a stepped shape, so that water can flow from the water inlet trough to the second water scrubber, from the second water scrubber to the first water scrubber, and from the first water scrubber to the hydrochloric acid collection tank by its own gravity, without the need for additional power.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This utility model provides a control device for the concentration of hydrochloric acid, a byproduct of an R142B production unit. By adjusting the pressure, temperature, and water inlet, the environment within the water scrubber is controlled to achieve a target hydrochloric acid solution concentration equal to the saturation concentration under these conditions, thereby precisely controlling the concentration of the hydrochloric acid produced as a byproduct of the R142B production unit. When hydrochloric acid solutions of varying concentrations are required, the concentration can be adjusted simply by adjusting the temperature, pressure, and water inlet, resulting in a simple and convenient adjustment method.

[0020] The utility model discloses a device for controlling the concentration of by-product hydrochloric acid in an R142B production device, further comprising a water-washing circulation pump and a gas-liquid separator. The water-washing circulation pump can lift liquid within the water storage chamber of the water scrubber from the top of the water scrubber, further increasing the contact area between the hydrochloric acid gas and the liquid, thereby ensuring sufficient absorption of the hydrochloric acid gas. The gas-liquid separator can further remove water vapor from the airflow, thereby purifying the R142B gas.

[0021] In a control device for the concentration of by-product hydrochloric acid in an R142B production device of the present invention, a water inlet washing tower includes a first water inlet washing tower and a second water inlet washing tower. The arrangement of the second water inlet washing tower can absorb hydrochloric acid gas that has not yet dissolved in water in the first water inlet washing tower, thereby further reducing the loss of hydrochloric acid gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a schematic structural diagram of Example 1 of a device for producing hydrochloric acid of different concentrations based on an R142B production process;

[0023] Figure 2 This is a schematic structural diagram of Example 2 of a device for producing hydrochloric acid of different concentrations based on an R142B production process;

[0024] Figure 3 This is a schematic structural diagram of Example 3 of a device for producing hydrochloric acid of different concentrations based on an R142B production process;

[0025] Figure 4 FIG4 is a schematic structural diagram of a fourth embodiment of an apparatus for producing hydrochloric acid of different concentrations based on an R142B production process;

[0026] Figure 5 This is a schematic diagram of the working of a control module of a device for producing hydrochloric acid of different concentrations based on the R142B production process, where the direction of the arrow indicates the direction of signal transmission.

[0027] In the attached figure: 1. Water washing tower; 2. Water inlet tank; 3. Hydrochloric acid collecting tank; 4. Alkali washing tower; 5. Air inlet pipe; 6. Air outlet pipe; 7. Water inlet pipe; 8. Water outlet pipe; 9. Flow regulating valve; 10. Water washing circulation pump; 101. First water washing tower; 102. Second water washing tower; 11. Air guide pipe; 12. Water guide pipe; 13. Gas-liquid separator; 14. Flow guide pipe; 15. First valve; 16. Second valve; 17. Third valve; 18. First water pump; 19. Second water pump; 20. Third water pump. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Example 1

[0031] This embodiment is the first embodiment of a device for controlling the concentration of by-product hydrochloric acid in an R142B production device. Figure 1 As shown, it includes a water washing tower 1, a water inlet tank 2, a hydrochloric acid collecting tank 3, an alkali washing tower 4 and a control module. The air inlet end of the water washing tower 1 is connected to the air inlet pipe 5, and the other end of the air inlet pipe 5 is used to connect to the air outlet end of the R142B production device. The air outlet end of the water washing tower 1 and the alkali washing tower 4 are connected through the air outlet pipe 6, the water inlet tank 2 and the water inlet end of the water washing tower 1 are connected through the water inlet pipe 7, and the water outlet end of the water washing tower 1 and the hydrochloric acid collecting tank 3 are connected through the water outlet pipe 8. A liquid level meter, a temperature sensor and a pressure sensor are installed in the water washing tower 1. The water washing tower 1 is also provided with a heater that can heat the water storage chamber of the water washing tower 1. Flow regulating valves 9 are provided on the air inlet pipe 5 and the air outlet pipe 6. The liquid level meter is connected to the control module to input the water level signal in the water washing tower 1; the temperature sensor is connected to the control module to input the temperature signal in the water washing tower 1; the control module is connected to the heater to control the operation of the heater; the pressure sensor is connected to the control module to input the pressure signal in the water washing tower 1; the control module is connected to the flow regulating valve 9 on the air inlet pipe 5 and the air outlet pipe 6 to control the opening of the flow regulating valve 9.

[0032] Specifically, the temperature in the water washing tower 1 is not higher than 60° C., and the pressure is not higher than 50 KPa, so that the saturation concentration of the hydrochloric acid solution in the water washing tower 1 is not less than 31%, and the concentration of the hydrochloric acid solution meets the lowest commercial standard.

[0033] The working principle or working process of this embodiment is as follows:

[0034] When the device is working, it first calculates the total amount of hydrochloric acid gas that can be obtained after the R142B production device is completed based on the production efficiency and material input of the R142B production device, and then calculates the target water injection volume in the water scrubber 1 based on the target hydrochloric acid solution concentration and the total amount of hydrochloric acid gas, and determines the ambient temperature and pressure when the target concentration is the saturated concentration of the hydrochloric acid solution. After obtaining the target water injection volume, target temperature and pressure, the water scrubber 1 is injected with water and the temperature and pressure of the inner cavity of the water scrubber 1 are adjusted through the control module according to the target water injection volume, target temperature and pressure. Figure 5As shown, when filling the water washing tower 1 with water, the water inlet pipe 7 is opened, and the water in the water inlet tank 2 flows along the water inlet pipe 7 into the water filling chamber of the water washing tower 1. The control module receives the water level signal from the liquid level gauge. When the liquid level gauge in the water washing tower 1 detects that the water level in the water washing tower 1 has reached the target water filling volume, the liquid level gauge sends the water level signal at this time to the control module. After receiving the signal, the control module closes the water inlet pipe 7 and stops filling water. At this time, the control module sends a working signal to the heater. After receiving the signal, the heater starts working and heats the water in the water storage chamber of the water washing tower 1. At the same time, the temperature sensor monitors the temperature in the water storage chamber in real time and sends the water temperature information to the control module. When the temperature in the water washing tower 1 reaches the target temperature, the control module controls the heater to stop working. The control module then sends a working signal to the flow control valve 9 on the air inlet pipe 5 and the air outlet pipe 6, adjusting its opening so that when the outlet end of the R142B production device injects gas into the water scrubber 1 through the air inlet pipe 5, the airflow through the R142B production device changes the pressure inside the water scrubber 1. At this time, the pressure sensor monitors the pressure inside the water scrubber in real time and transmits the pressure information to the control module. After the control module receives the pressure signal of the inner cavity of the water scrubber 1 monitored by the pressure sensor and reaches the target pressure, the R142B production device normally injects gas into the water scrubber 1 through the air inlet pipe 5. When the R142B production device injects gas into the water scrubber through the air inlet pipe, the water scrubber 1 washes the airflow with water, and the hydrochloric acid gas in the airflow dissolves in water to form a hydrochloric acid solution. The R142B gas and the hydrochloric acid gas that has not yet dissolved in water flow out along the air outlet pipe 6 and enter the alkali scrubber 4. Then, the excess hydrochloric acid gas is neutralized in the alkali scrubber 4, and the R142B gas flows out from the air outlet end of the alkali scrubber 4. Since the temperature and pressure in the water scrubber 1 are both preset temperature and pressure, after the R142B production device completes production under the conditions of the temperature and pressure, the saturated concentration of the hydrochloric acid solution in the water scrubber 1 is the target hydrochloric acid solution concentration. When it is necessary to adjust the solubility of hydrochloric acid, the adjustment of the saturated concentration of the solution in the water scrubber 1 can be completed by re-changing the water injection rate, temperature and pressure in the water scrubber 1. After the R142B production device completes production, the hydrochloric acid solution in the water scrubber 1 also reaches the target concentration. At this time, the water outlet pipe 8 is opened, and the hydrochloric acid solution in the water scrubber 1 is injected into the hydrochloric acid collecting tank 3 along the water outlet pipe 8. After the hydrochloric acid solution in the water scrubber 1 is discharged, the water outlet pipe 8 is closed, and the water inlet pipe 7 is reopened to produce the second hydrochloric acid solution.

[0035] The beneficial effects of this embodiment are as follows:

[0036] The device for controlling the concentration of hydrochloric acid, a byproduct of the R142B production unit, in this solution controls the environment within water scrubber 1 by adjusting pressure, temperature, and water inflow, ensuring that the target concentration of the hydrochloric acid solution is the saturated concentration under these conditions. This allows for precise control of the concentration of the hydrochloric acid produced as a byproduct of the R142B production unit. To obtain hydrochloric acid solutions of varying concentrations, the temperature, pressure, and water inflow are simply adjusted, resulting in a simple and convenient adjustment method.

[0037] Example 2

[0038] This embodiment is the second embodiment of a device for controlling the concentration of by-product hydrochloric acid in an R142B production device. Figure 2 As shown, this embodiment further limits the structure of the device based on the first embodiment.

[0039] Specifically, the water inlet end of the water washing tower 1 is located at the top of the water storage chamber in the water washing tower 1, and the water outlet end of the water washing tower 1 is located at the bottom of the water storage chamber in the water washing tower 1; the air inlet end of the water washing tower 1 is located at the bottom of the water storage chamber in the water washing tower 1, and the air outlet end of the water washing tower 1 is located at the top of the water washing tower 1.

[0040] Specifically, the heater is a heating rod, and the heater is located on the inner wall of the water storage chamber of the water washing tower. There are several heating rods, and the heating rods are arranged in an array on the inner wall of the water storage chamber of the water washing tower 1.

[0041] Specifically, the water washing tower 1 is provided with a water washing circulation pump 10 for raising the liquid in the inner cavity of the water washing tower 1. The two ends of the water washing circulation pump 10 are respectively connected to the bottom and the top of the inner cavity of the water washing tower 1. The water level in the inner cavity of the water washing tower 1 is 50%-70% of its inner cavity height.

[0042] The beneficial effects of this embodiment are as follows:

[0043] In this scheme, the control device for the concentration of hydrochloric acid byproduct produced by the R142B production unit has a water inlet at the top of the water storage chamber of the water scrubber 1, preventing water from flowing out of the water inlet after the water is filled. The water outlet of the water scrubber 1 is located at the bottom of the water storage chamber of the water scrubber 1, facilitating the flow of water from the water scrubber 1. The air inlet of the water scrubber 1 is located at the bottom, and the air outlet is located at the top, ensuring that the airflow entering the water scrubber 1 fully contacts the water in the water storage chamber, thereby improving the washing effect on the hydrochloric acid gas.

[0044] The heating rod has good heating effect, small size and long service life. There are several heating rods, which can further improve the heating effect of the heater and accelerate the temperature rise speed of the water body in the water storage chamber of the water washing tower 1.

[0045] The water-washing circulation pump 10 lifts the liquid within the water storage chamber of the water-washing tower 1 from the top of the water-washing tower 1, allowing the liquid to fall back into the water storage chamber of the water-washing tower 1. This further increases the contact area between the hydrochloric acid gas and the liquid, ensuring that the hydrochloric acid gas is fully absorbed. The water level in the water-washing tower 1 is 50%-70% of its height, ensuring that the liquid lifted by the water-washing circulation pump 10 has a sufficient path to contact the hydrochloric acid gas in the airflow, forming a hydrochloric acid solution.

[0046] Example 3

[0047] This embodiment is a third embodiment of a device for controlling the concentration of by-product hydrochloric acid in an R142B production device. This embodiment is based on the second embodiment. Figure 3 As shown, the structure of the water washing tower 1 is further limited.

[0048] Specifically, the water scrubber 1 includes a first water scrubber 101 and a second water scrubber 102. The air inlet of the first water scrubber 101 is connected to the air inlet pipe 5, and the air outlet of the second water scrubber 102 is connected to the alkali scrubber 4 via the air outlet pipe 6. The air inlet of the first water scrubber 101 and the air outlet of the second water scrubber 102 are connected via an air guide pipe 11, which is provided with a flow regulating valve 9. The water outlet of the first water scrubber 101 is connected to the water outlet pipe 8, and the water inlet of the second water scrubber 102 is connected to the water inlet pipe 7. The water inlet of the first water scrubber 101 and the water outlet of the second water scrubber 102 are connected via a water guide pipe 12. The temperature within the water scrubber 1 is not higher than 60°C, and the pressure within the water scrubber 1 is not higher than 50 kPa.

[0049] Specifically, the gas outlet pipe 6 is further provided with a gas-liquid separator 13 for removing liquid in the gas flow, and a flow guide pipe 14 communicating with the inner cavity of the second water washing tower 102 is provided at the bottom of the gas-liquid separator 13 .

[0050] Specifically, a first valve 15 is installed on the water inlet pipe 7, located at one end of the water inlet pipe 7 near the water inlet tank 2. A second valve 16 is installed on the water conduit 12, located at one end of the water conduit 12 near the second water scrubber 102. A third valve 17 is installed on the water outlet pipe 8, located at one end of the water outlet pipe 8 near the first water scrubber 101. The first, second, and third valves 15, 16, and 17 are all remote-controlled solenoid valves.

[0051] Specifically, a first water pump 18 is installed on the water inlet pipe 7, and the first water pump 18 is located on the water inlet pipe 7 at one end close to the second water washing tower 102; a second water pump 19 is installed on the water pipe 12, and the second water pump 19 is located on the water pipe 12 at one end close to the first water washing tower 101; a third water pump 20 is installed on the water outlet pipe 8, and the third water pump 20 is located on the water outlet pipe 8 at one end close to the hydrochloric acid collection tank 3.

[0052] The working principle or working process of this embodiment is as follows:

[0053] When injecting water, open the second valve 16 and the first valve 15, and the water inlet tank 2 injects water into the first water washing tower 101 and the second water washing tower 102 through the water inlet pipe 7 and the water guide pipe 12 until the liquid level gauges in the first water washing tower 101 and the second water washing tower 102 detect that the water volume has reached the target water volume, and then close the first valve 15 and the second valve 16. When discharging the hydrochloric acid solution, first open the third valve 17, and discharge the hydrochloric acid solution in the first water washing tower 101 into the hydrochloric acid collection tank 3 through the outlet pipe 8, then close the third valve 17, open the first valve 15 and the second valve 16, so that the water in the water inlet tank 2 flows back into the second water washing tower 102, and the water in the second water washing tower 102 flows into the first water washing tower 101. When adjusting the pressure in the water washing tower 1, the openings of the flow regulating valves 9 on the air inlet pipe 5, the air guide pipe 11 and the air outlet pipe 6 are changed so that the openings of the three flow regulating valves 9 are reduced in sequence until the target pressure is reached in the first water washing tower 101 and the second water washing tower 102.

[0054] The beneficial effects of this embodiment are as follows:

[0055] Two water scrubbers 1 are provided, and the second water scrubber 102 can absorb the hydrochloric acid gas not absorbed by the first water scrubber 101, thereby reducing the loss of hydrochloric acid gas. The gas-liquid separator 13 can further remove the water vapor in the air flow, purify the R142B gas, and transfer the collected water vapor to the inner cavity of the second water scrubber 102 through the guide pipe 14, thereby further avoiding waste. The setting of the valve enables the operator to realize the opening and closing of the pipeline through the valve. The valve is configured as a remote control solenoid valve, so that the staff can remotely control the opening and closing of the valve, thereby further reducing the workload of the staff. A water pump is installed on the water pipe, and the transfer of the water body can be completed by the water pump, with fast and high efficiency.

[0056] Example 4

[0057] This embodiment is the fourth embodiment of a device for controlling the concentration of by-product hydrochloric acid in an R142B production device. Figure 4 As shown, the difference between this embodiment and embodiment three is that: no water pump is provided, and in the vertical direction, the water outlet end of the water inlet tank 2 is located above the water inlet end of the second water washing tower 102; the water outlet end of the second water washing tower 102 is located above the water inlet end of the first water washing tower 101; and the water outlet end of the first water washing tower 101 is located above the hydrochloric acid collection tank 3.

[0058] The beneficial effects of this embodiment are as follows:

[0059] The water outlet end of the water inlet tank 2, the water inlet end of the second water washing tower 102, the water outlet end of the second water washing tower 102, the water inlet end of the first water washing tower 101, the water outlet end of the first water washing tower 101 and the hydrochloric acid collection tank 3 are arranged in a stepped shape, so that the water flow can flow from the water inlet tank 2 into the second water washing tower 102, from the second water washing tower 102 into the first water washing tower 101, and from the first water washing tower 101 into the hydrochloric acid collection tank 3 by its own gravity, without the need for additional power.

[0060] Other features, working principles and beneficial effects of this embodiment are consistent with those of the third embodiment.

[0061] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A device for controlling the concentration of by-product hydrochloric acid in an R142B production device, characterized in that: The invention comprises a water washing tower (1), a water inlet tank (2), a hydrochloric acid collecting tank (3), an alkali washing tower (4) and a control module, wherein the air inlet end of the water washing tower (1) is connected to an air inlet pipe (5), the other end of the air inlet pipe (5) is used to connect to the air outlet end of an R142B production device, the air outlet end of the water washing tower (1) and the alkali washing tower (4) are connected via an air outlet pipe (6), the water inlet tank (2) and the water inlet end of the water washing tower (1) are connected via an air inlet pipe (7), the water outlet end of the water washing tower (1) and the hydrochloric acid collecting tank (3) are connected via an air outlet pipe (8), a liquid level meter, a temperature sensor and a pressure sensor are installed in the water washing tower (1), a heater capable of heating the water storage chamber of the water washing tower (1) is further provided in the water washing tower (1), a flow regulating valve (9) is provided on both the air inlet pipe (5) and the air outlet pipe (6), The liquid level meter is connected to the control module to input a water level signal in the water washing tower (1); the temperature sensor is connected to the control module to input a temperature signal in the water washing tower (1); the control module is connected to the heater to control the operation of the heater; The pressure sensor is connected to the control module to input a pressure signal in the water washing tower (1); the control module is connected to the flow regulating valve (9) on the air inlet pipe (5) and the air outlet pipe (6) to control the opening of the flow regulating valve (9).

2. The control device for the concentration of by-product hydrochloric acid in an R142B production device according to claim 1, characterized in that: The water inlet end of the water scrubber (1) is located at the top of the water storage chamber in the water scrubber (1), and the water outlet end of the water scrubber (1) is located at the bottom of the water storage chamber in the water scrubber (1); the air inlet end of the water scrubber (1) is located at the bottom of the water storage chamber of the water scrubber (1), and the air outlet end of the water scrubber (1) is located at the top of the water scrubber (1).

3. The control device for the concentration of by-product hydrochloric acid in an R142B production device according to claim 1, characterized in that: The heater is a heating rod, and the heater is located on the inner side wall of the water storage chamber of the water washing tower (1).

4. The control device for the concentration of by-product hydrochloric acid in an R142B production device according to claim 1, characterized in that: The water washing tower (1) is provided with a water washing circulation pump (10) for raising the liquid in the water washing tower (1) into its inner cavity, and the two ends of the water washing circulation pump (10) are respectively connected to the bottom of the inner cavity of the water washing tower (1) and the top of the inner cavity of the water washing tower (1).

5. The control device for the concentration of by-product hydrochloric acid in an R142B production device according to claim 4, characterized in that: The water level in the inner cavity of the water washing tower (1) is 50%-70% of its inner cavity height.

6. A control device for the concentration of by-product hydrochloric acid in an R142B production device according to any one of claims 1 to 5, characterized in that: The water washing tower (1) comprises a first water washing tower (101) and a second water washing tower (102), wherein the air inlet end of the first water washing tower (101) is connected to the air inlet pipe (5), and the air outlet end of the second water washing tower (102) is connected to the alkali washing tower (4) through the air outlet pipe (6); the air inlet end of the first water washing tower (101) and the air outlet end of the second water washing tower (102) are connected through an air guide pipe (11), and a flow regulating valve (9) is provided on the air guide pipe (11); the water outlet end of the first water washing tower (101) is connected to the water outlet pipe (8), the water inlet end of the second water washing tower (102) is connected to the water inlet pipe (7), and the water inlet end of the first water washing tower (101) and the water outlet end of the second water washing tower (102) are connected through a water guide pipe (12).

7. The device for controlling the concentration of by-product hydrochloric acid in an R142B production device according to claim 6, characterized in that: The gas outlet pipe (6) is also provided with a gas-liquid separator (13) for removing liquid in the gas flow, and a flow guide pipe (14) communicating with the inner cavity of the second water washing tower (102) is provided at the bottom of the gas-liquid separator (13).

8. The device for controlling the concentration of by-product hydrochloric acid in an R142B production device according to claim 6, characterized in that: A first valve (15) is installed on the water inlet pipe (7), and the first valve (15) is located on one end of the water inlet pipe (7) close to the water inlet trough (2); a second valve (16) is installed on the water guide pipe (12), and the second valve (16) is located on one end of the water guide pipe (12) close to the second water washing tower (102); a third valve (17) is installed on the water outlet pipe (8), and the third valve (17) is located on one end of the water outlet pipe (8) close to the first water washing tower (101).

9. The device for controlling the concentration of by-product hydrochloric acid in an R142B production device according to claim 8, characterized in that: A first water pump (18) is installed on the water inlet pipe (7), and the first water pump (18) is located on one end of the water inlet pipe (7) close to the second water washing tower (102); a second water pump (19) is installed on the water guide pipe (12), and the second water pump (19) is located on one end of the water guide pipe (12) close to the first water washing tower (101); a third water pump (20) is installed on the water outlet pipe (8), and the third water pump (20) is located on one end of the water outlet pipe (8) close to the hydrochloric acid collection tank (3).

10. The device for controlling the concentration of by-product hydrochloric acid in an R142B production device according to claim 8, characterized in that: In the vertical direction, the water outlet of the water inlet trough (2) is located above the water inlet of the second water washing tower (102); the water outlet of the second water washing tower (102) is located above the water inlet of the first water washing tower (101); and the water outlet of the first water washing tower (101) is located above the hydrochloric acid collecting tank (3).

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