Harmful gas multi-stage absorption experiment device

Abstract

The utility model discloses a multi-stage harmful gas absorption experiment device, and belongs to a chemical experiment technology. The device comprises absorption bottles, a gas conveying pipe, a gas collecting pipe, a first electromagnetic valve, a timing electromagnetic valve, a gas collecting container, a gas concentration sensor, a PLC (Programmable Logic Controller) control system and a rubber plug, different stages of absorption bottles are communicated through the gas conveying pipe, the gas collecting container is communicated with the gas conveying pipe through the gas collecting pipe, and the first electromagnetic valve is arranged on the gas collecting pipe; a gas concentration sensor is mounted in the gas collecting container, a gas collecting pipe and a timing electromagnetic valve are sequentially arranged on the gas conveying pipe behind each stage of absorption bottle according to the gas conveying direction, and the input ends of the first electromagnetic valve and the timing electromagnetic valve are in communication connection with the output end of the PLC control system; and the output ends of the gas concentration sensor and the timing electromagnetic valve are in communication connection with the input end of the PLC control system. The gas collection device can automatically complete gas collection work, reduces experiment work complexity, and improves working efficiency of experimenters.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical experiments and relates to a harmful gas multi-stage absorption experimental device. Background Art

[0002] Harmful gases are one of the sources of atmospheric pollution. Treating harmful gases to reduce or eliminate pollution is one of the important measures for environmental protection. Therefore, it is necessary to carry out relevant experiments on the effects of harmful gas treatment to provide support for the optimization of harmful gas treatment effects.

[0003] When conducting exploratory experiments to evaluate the effectiveness of harmful gas treatment, the gas is absorbed using an absorption liquid, and then the gas treated with the absorption liquid is collected, tested, and analyzed to evaluate the effectiveness of the harmful gas treatment. However, manual gas collection during the experiment is relatively cumbersome, especially in multi-stage absorption experiments, which involve collecting the treated gas at each stage separately at different time periods. Workers need to perform gas collection operations frequently, and even when workers are performing multiple tasks simultaneously, gas collection work may affect the normal progress of other tasks, resulting in a decrease in overall work efficiency.

[0004] Therefore, it is necessary to provide a multi-stage absorption experimental device for harmful gases, which can automatically collect the treated gas during the experiment, eliminating the need for staff to frequently collect the gas, thereby improving staff work efficiency and reducing the complexity of experimental work. Utility Model Content

[0005] In order to overcome the problems in the background technology, the utility model automatically controls the valves installed on each pipeline through a PLC control system to achieve the purpose of automatic gas collection during the multi-stage absorption experiment. There is no need for staff to frequently perform gas collection operations, thereby improving staff work efficiency and reducing the complexity of experimental work.

[0006] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0007] The experimental device includes an absorption bottle 1, a gas supply pipe 2, a gas collecting pipe 3, a first solenoid valve 4, a timing solenoid valve 5, a gas collecting container 6, a gas concentration sensor 7, a PLC control system, and a rubber stopper 11. The absorption bottle 1 is filled with gas absorption liquid and is sealed by the rubber stopper 11. The absorption bottles 1 at different levels are connected through the gas supply pipe 2. The experimental harmful gas enters the first-stage absorption bottle 1 through the gas supply pipe 2 and is output through the gas supply pipe 2 after multi-stage treatment. The harmful gas multi-stage absorption experimental device, the gas collecting container 6 is connected to the gas supply pipe 2 through the gas collection pipe 3, the first solenoid valve 4 is installed on the gas collection pipe 3, and the gas concentration sensor 7 is installed inside the gas collection container 6. According to the gas delivery direction, the gas collection pipe 3 and the timing solenoid valve 5 are sequentially arranged on the gas supply pipe 2 after each level of the absorption bottle 1. The input ends of the first solenoid valve 4 and the timing solenoid valve 5 are communicatively connected to the output end of the PLC control system, and the output ends of the gas concentration sensor 7 and the timing solenoid valve 5 are communicatively connected to the input end of the PLC control system;

[0008] Preferably, the experimental device further comprises a liquid exchange tube 8 , which is arranged at the bottom of the side wall of the absorption bottle 1 , and a valve is installed on the liquid exchange tube 8 .

[0009] Preferably, the gas collection pipe 3 is connected to multiple gas collection containers 6 through a branch pipe 9, and a second solenoid valve 10 is installed on each branch pipe 9. The input end of the second solenoid valve 10 is communicatively connected to the PLC control system.

[0010] Beneficial effects of the utility model:

[0011] 1. The utility model uses a PLC control system for automatic control to achieve automatic collection of gases during the multi-stage absorption experiment of harmful gases, reducing the complexity of experimental work and improving the work efficiency of staff.

[0012] 2. The utility model provides a liquid exchange tube, and the absorption liquid in the absorption bottle can be discharged or replaced through the liquid exchange tube without disassembling the experimental device, which is convenient for the staff to perform experimental operations.

[0013] 3. By setting up multiple gas collection containers, the utility model can collect the gas after the same level of treatment multiple times at different times, so as to obtain more abundant experimental samples and provide more comprehensive support for subsequent research work. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the utility model.

[0015] In the figure, 1-absorption bottle, 2-gas delivery pipe, 3-gas collection pipe, 4-first solenoid valve, 5-timing solenoid valve, 6-gas collection container, 7-gas concentration sensor, 8-liquid exchange pipe, 9-branch pipe, 10-second solenoid valve, 11-rubber stopper. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to specific embodiments.

[0017] like Figure 1 As shown, the experimental device includes an absorption bottle 1, a gas supply pipe 2, a gas collecting pipe 3, a first solenoid valve 4, a timing solenoid valve 5, a gas collecting container 6, a gas concentration sensor 7, a PLC control system, and a rubber stopper 11. The absorption bottle 1 is filled with gas absorption liquid and is sealed by a rubber stopper 11. The absorption bottles 1 at different levels are connected through the gas supply pipe 2. The experimental harmful gas enters the first-level absorption bottle 1 through the gas supply pipe 2 and outputs the harmful gas through the gas supply pipe 2 after multi-stage treatment. Multi-stage absorption experimental device, the gas collecting container 6 is connected to the gas supply pipe 2 through the gas collection pipe 3, the first solenoid valve 4 is installed on the gas collection pipe 3, and a gas concentration sensor 7 is installed inside the gas collection container 6. According to the gas delivery direction, the gas collection pipe 3 and the timing solenoid valve 5 are sequentially arranged on the gas supply pipe 2 after each level of the absorption bottle 1. The input ends of the first solenoid valve 4 and the timing solenoid valve 5 are communicatively connected to the output end of the PLC control system, and the output ends of the gas concentration sensor 7 and the timing solenoid valve 5 are communicatively connected to the input end of the PLC control system.

[0018] During the experiment, the gas pipe 2 passes through the rubber stopper 11 so that the end of the gas pipe 2 is located inside the absorption bottle 1, and the end of the gas pipe 2 that inputs gas into the absorption bottle 1 extends into the absorption liquid, so that the gas can directly contact the absorption liquid. The end of the gas pipe 2 that enters the gas does not contact the absorption liquid, preventing the absorption liquid from entering the gas pipe 2.

[0019] After the experiment begins, the harmful gas is fed into the first-stage absorption bottle 1 through the gas pipe 2. After being absorbed by the absorption liquid in the first-stage absorption bottle 1, it continues to pass through the gas pipe 2 into the next-stage absorption bottle 1. After being absorbed by the absorption liquid in the next-stage absorption bottle 1, the gas is treated and then enters the next-stage absorption bottle 1 through the gas pipe 2 for absorption treatment. Figure 1What is shown in the figure is a three-stage absorption experimental device for harmful gases. The harmful gas conveying direction in the figure is from left to right, and from left to right in the figure are the first-stage absorption bottle, the second-stage absorption bottle, and the third-stage absorption bottle. The experimental harmful gas enters the first-stage absorption bottle from the air inlet pipe, and after being treated, enters the second-stage absorption bottle through the air supply pipe 2 for treatment, and then enters the third-stage absorption bottle through the air supply pipe 2 for treatment. Finally, the treated gas in the third-stage absorption bottle is output through the air supply pipe 2 for unified collection and treatment. During the experiment, the timing solenoid valve 5 is set according to the preset gas collection time of the experiment. When the timing solenoid valve 5 reaches the preset time, it automatically closes and transmits a signal to the PLC control system. After receiving the signal, the PLC control system controls the first solenoid valve 4 to open. At this time, the air supply pipe 2 is blocked, and the gas collection pipe 3 is unblocked. The gas is transported from the gas collection pipe 3 to the gas collection container 6 for collection. During the gas collection process of the container 6, the gas concentration sensor 7 transmits a signal to the PLC control system in real time. When the collected gas volume meets the conditions, the PLC control system receives the signal transmitted by the gas concentration sensor 7, controls the first solenoid valve 4 to close, and controls the timing solenoid valve 5 to open. At this time, the gas collection pipe 3 is blocked, and the gas supply pipe 2 is unobstructed. The gas continues to be transported to the next-level absorption bottle through the gas supply pipe 2, thereby realizing automatic gas collection during the experiment. The staff only needs to collect the gas collection container 6 filled with gas in a unified manner after the experiment is completed, and the gas samples needed for subsequent research and analysis can be obtained. The amount of gas collected after different levels of treatment needs to be determined during the experimental design. The gas collection volume of the experimental design can be input into the PLC control system in advance, so that the PLC control system can judge whether the amount of gas collected in the gas collection container 6 meets the experimental requirements based on the signal transmitted by the corresponding gas concentration sensor 7.

[0020] The experimental device further comprises a liquid exchange tube 8 , which is arranged at the bottom of the side wall of the absorption bottle 1 , and a valve is installed on the liquid exchange tube 8 .

[0021] When it is necessary to discharge the absorption liquid in the absorption bottle 1 or replace the liquid, it is only necessary to open the valve first, and the absorption liquid in the absorption bottle 1 will be discharged through the liquid replacement tube 8. After the absorption liquid is discharged, if new absorption liquid needs to be added, the absorption liquid is then fed into the absorption bottle 1 through the liquid replacement tube 8, and then the valve can be closed. There is no need to remove the rubber stopper 11 connected to the air supply pipe 2 and other components to discharge and replace the absorption liquid, which is convenient for operation.

[0022] The gas collection pipe 3 is connected to a plurality of gas collection containers 6 via a branch pipe 9 , and a second solenoid valve 10 is installed on each branch pipe 9 . The input end of the second solenoid valve 10 is communicatively connected to a PLC control system.

[0023] When it is necessary to collect the gas absorbed and treated at the same level multiple times, the gas collection pipe 3 is connected to multiple gas collection containers 6 through a branch pipe 9. After the timing solenoid valve 5 reaches the preset time, it automatically closes and transmits the signal to the PLC control system. The PLC control system simultaneously controls the first solenoid valve 4 and the second solenoid valve 10 to open, so that the gas enters one of the gas collection containers 6. The gas concentration sensor 7 in the corresponding gas collection container 6 transmits a signal to the PLC control system. When the collected gas volume meets the requirements, the PLC control system controls the second solenoid valve 10 and the first solenoid valve 4 to close after receiving the signal, and controls the timing solenoid valve 5 to open at the same time. The PLC control system only needs to control different second solenoid valves 10 to open at different times, and the first solenoid valve 4 and the corresponding second solenoid valve 10 installed on the same gas collection pipe 3 are in a state of simultaneous switching, which can achieve the purpose of collecting the gas absorbed and treated at the same level multiple times.

[0024] The working process of the utility model is as follows: after the experiment starts, the harmful gas first enters the first-stage absorption bottle through the air inlet pipe and contacts with the absorption liquid in the first-stage absorption bottle. The treated gas enters the next-stage absorption bottle through the air supply pipe and contacts with the absorption liquid, and this process is repeated until it enters the last-stage absorption bottle. After being absorbed and treated by the absorption liquid in the last-stage absorption bottle, the gas enters the subsequent process through the air outlet pipe. As the experiment time increases, when the preset gas collection time is reached, the timing solenoid valve determines through timing that gas collection is required, and the timing solenoid valve automatically closes and transmits a signal to the PLC control system. The PLC control system controls the first solenoid valve to open (when there is a second solenoid valve, the PLC control system simultaneously controls the first solenoid valve and the second solenoid valve to open), and the gas enters the gas collection container through the gas collection pipe. When enough gas is collected in the gas collection container, the PLC control system receives the signal and controls the first solenoid valve to close (when there is a second solenoid valve, the PLC control system simultaneously controls the first solenoid valve and the second solenoid valve to close), and at the same time controls the timing solenoid valve to open, returning to the absorption experiment process, and repeating the above-mentioned gas collection and absorption experiment process until the entire experiment is completed. When the absorption liquid in the absorption bottle needs to be discharged or replaced, the valve on the liquid replacement pipe is opened, the original absorption liquid can be discharged through the liquid replacement pipe, and the new absorption liquid can be sent to the absorption bottle.

[0025] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A harmful gas multi-stage absorption experimental device, characterized by: The experimental device comprises an absorption bottle (1), a gas transmission pipe (2), a gas collection pipe (3), a first electromagnetic valve (4), a timing electromagnetic valve (5), a gas collection container (6), a gas concentration sensor (7), a PLC control system, and a rubber stopper (11). The absorption bottle (1) is filled with gas absorption liquid and is sealed by the rubber stopper (11). Different levels of absorption bottles (1) are connected through the gas transmission pipe (2). The experimental harmful gas enters the first-stage absorption bottle (1) through the gas transmission pipe (2) and is output through the gas transmission pipe (2) after multi-stage treatment. The multi-stage absorption experimental device of harmful gas is provided. The gas collection container (6) is connected to the gas delivery pipe (2) through a gas collection pipe (3), a first solenoid valve (4) is installed on the gas collection pipe (3), a gas concentration sensor (7) is installed inside the gas collection container (6), and a gas collection pipe (3) and a timing solenoid valve (5) are sequentially arranged on the gas delivery pipe (2) after each level of the absorption bottle (1) according to the gas delivery direction, the first solenoid valve (4) and the timing solenoid valve (5) input end are communicatively connected to the output end of the PLC control system, and the gas concentration sensor (7) and the timing solenoid valve (5) output end are communicatively connected to the input end of the PLC control system.

2. A harmful gas multi-stage absorption experimental device according to claim 1, characterized in that: The experimental device further comprises a liquid exchange tube (8), which is arranged at the bottom of the side wall of the absorption bottle (1), and a valve is installed on the liquid exchange tube (8).

3. A harmful gas multi-stage absorption experimental device according to claim 1 or 2, characterized in that: The gas collection pipe (3) is connected to a plurality of gas collection containers (6) via a branch pipe (9), and a second solenoid valve (10) is installed on each branch pipe (9), and an input end of the second solenoid valve (10) is communicatively connected to a PLC control system.

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