Harmful gas detection device for limnoperna fortunei dehydration death and decay physical model

Abstract

The utility model discloses a limnoperna fortunei dehydration death and decay physical model harmful gas detection device, which comprises a water delivery tunnel model and a detection system, the water delivery tunnel model adopts a cylinder structure, two ends of the water delivery tunnel model are provided with closing plates, the left closing plate is provided with an overflow hole, and the right closing plate is provided with an air inlet hole, an air outlet hole and a multi-purpose hole. An electric blanket wraps the outer side of the water delivery tunnel model, a temperature and humidity measuring hole is formed in the side wall of the water delivery tunnel model, the water delivery tunnel model is rotatably installed on the support, the detection system comprises a condensation pipe, an H2S sensor, an NH3 sensor, a TVOC sensor and a data acquisition instrument which are sequentially connected in series, an air inlet of the condensation pipe is connected with the air outlet, an outlet of the TVOC sensor is connected with the air inlet, and the data acquisition instrument is connected with the water delivery tunnel model. And the data acquisition instrument acquires measurement data of the H2S sensor, the NH3 sensor and the TVOC sensor. The device can be used for exploring the harmful gas release characteristics of the limnoperna fortunei in the overhaul period of the water delivery tunnel.

Description

Technical Field

[0001] This utility model belongs to the field of physical model detection technology, and specifically relates to a device for detecting harmful gases in a physical model of dehydration, death and decay of freshwater shellfish. Background Technology

[0002] Freshwater mussels are a type of aquatic snail. Distributed in the middle and lower reaches of the Yangtze and Han Rivers, they typically attach to the inner walls of pipelines, the bottoms of ships, and rocks, leading to a decrease in pipeline transport capacity and an increase in ship resistance. In water conveyance projects, freshwater mussels readily adhere to the walls of water pipelines, reducing the pipe's flow area, increasing its roughness, and decreasing its flow capacity. Concrete surfaces of water conveyance structures with freshwater mussel attachments are susceptible to erosion, leading to mortar loss and aggregate exposure, thus affecting the structural safety of the water conveyance structures.

[0003] Currently, freshwater mussels are widely attached to water conveyance tunnels in the Yangtze and Han River basins. Therefore, water conveyance projects regularly inspect and clean these mussels. However, during these maintenance periods, the dehydration and decay of the mussels produce large amounts of harmful gases such as NH3 and H2S. This not only causes foul odor pollution within the tunnels but also, if accumulated in confined spaces, can seriously endanger human health. Therefore, it is essential to understand the release patterns of these decaying gases from freshwater mussels to facilitate timely ventilation and reduce pollution. However, due to the influence of high geothermal temperatures in some sections of the water conveyance tunnels, the internal temperature varies, resulting in different decay processes and gas release patterns for the mussels at different temperatures. Therefore, investigating the harmful gas release characteristics of freshwater mussels considering temperature effects is of great significance. Utility Model Content

[0004] This invention provides a device for detecting harmful gases from a physical model of dehydration, death, and decay of freshwater shellfish, in order to solve the technical problems existing in the prior art. It is used to investigate the release characteristics of harmful gases from freshwater shellfish during the maintenance period of water conveyance tunnels.

[0005] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: a harmful gas detection device for a physical model of dehydration, death and decay of freshwater shellfish, including a water conveyance tunnel model and a detection system. The water conveyance tunnel model adopts a cylindrical structure with closed plates at both ends, namely a left closed plate and a right closed plate. An overflow hole is provided on the left closed plate, and an air inlet, an air outlet and a multi-purpose hole are provided on the right closed plate. The water conveyance tunnel model is wrapped with an electric heating blanket on the outside, and temperature and humidity measuring holes are provided on the side wall. The water conveyance tunnel model is rotatably mounted on a support. The detection system includes a condenser tube, an H2S sensor, an NH3 sensor and a TVOC sensor connected in series, and a data acquisition instrument. The air inlet of the condenser tube is connected to the air outlet, and the outlet of the TVOC sensor is connected to the air inlet. The data acquisition instrument collects the measurement data of the H2S sensor, the NH3 sensor and the TVOC sensor.

[0006] The water conveyance tunnel model is made of plexiglass.

[0007] The advantages and positive effects of this utility model are as follows: A cylindrical structure wrapped with an electric heating blanket simulates a water conveyance tunnel. Temperature control via the electric heating blanket simulates different ground temperatures in an actual tunnel. Rotating the cylinder ensures even distribution of freshwater mussels within it, and the transparent material allows observation of the mussels' decay. Temperature and humidity control via the electric heating blanket regulate the model's internal temperature and humidity, and temperature and humidity measurement holes allow for real-time monitoring of these changes, effectively ensuring that the model's internal environment closely matches the environmental conditions during the maintenance period of an actual water conveyance tunnel. A detection system monitors changes in harmful gas concentrations in real time, thus revealing the release patterns of harmful gases. Gases detected by the system flow back into the model, ensuring that the gas concentration within the model is unaffected by the detection system, making it more closely resemble the actual situation. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 This is a schematic diagram of the detection system of this utility model.

[0010] In the diagram: 1-Water conveyance tunnel model, 2-Overflow hole, 3-Temperature and humidity measurement hole, 4-Electric blanket, 5-Support, 6-Air inlet, 7-Air outlet, 8-Multi-purpose hole, 9-Air outlet, 10-Air inlet, 11-Data acquisition instrument, 12-Detection system, 13-TVOC sensor, 14-NH3 sensor, 15-H2S sensor, 16-Condenser pipe. Detailed Implementation

[0011] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0012] Please see Figure 1 and Figure 2 A physical model of dehydration, death and decay of freshwater shellfish and a device for detecting harmful gases, comprising a water conveyance tunnel model 1 and a detection system 12.

[0013] The water conveyance tunnel model 1 adopts a cylindrical structure with closed plates at both ends, namely a left closed plate and a right closed plate. An overflow hole 2 is provided on the left closed plate, and an air inlet hole 6, an air outlet hole 7 and a multi-purpose hole 8 are provided on the right closed plate. The water conveyance tunnel model 1 is wrapped with an electric heating blanket 4 on the outside, and temperature and humidity measuring holes 4 are provided on the side wall. The water conveyance tunnel model 1 is rotatably mounted on a support 5.

[0014] The detection system 12 includes a condenser 16, an H2S sensor 15, an NH3 sensor 14, and a TVOC sensor 13 connected in series, as well as a data acquisition instrument 11. The air inlet 10 of the condenser 16 is connected to the air outlet 7, the outlet of the TVOC sensor 14 is connected to the air inlet 6, and the data acquisition instrument 11 collects the measurement data of the H2S sensor 15, the NH3 sensor 14, and the TVOC sensor 13.

[0015] In this embodiment, the water conveyance tunnel model 1 is made of plexiglass, which is transparent and facilitates observation of the decay of freshwater shellfish inside.

[0016] Applications of this utility model:

[0017] Taking a water conveyance tunnel in Guangdong as an example, the tunnel model is set with a diameter of 0.8m, a length of 1m, and a volume of 0.5m³. 3 The survey revealed that the average density of freshwater shellfish attached to the tunnel was 912 g / m³. 3 The mass of freshwater shellfish placed in the tunnel model based on the adhesion density is 912 * 0.5 = 456 g.

[0018] Follow these steps:

[0019] 1) Pass a certain amount of water into the model through the multi-purpose hole, turn on the electric heating blanket, and after the temperature reaches the predetermined temperature, drain the water from the model to simulate the actual water conveyance tunnel maintenance environment. Place freshwater shellfish into the model through the multi-purpose hole and rotate the model to make the freshwater shellfish evenly distributed on the inner wall of the model.

[0020] 2) Harmful gases are produced after the freshwater shellfish die. These gases diffuse completely within the model. Temperature and humidity inside the model are monitored in real time using a temperature and humidity meter. The harmful gases enter the detection system through the air inlet for detection.

[0021] 3) In the detection system, harmful gases are detected sequentially by electrochemical sensors for H2S, NH3, and TVOC. The detected exhaust gas flows back into the model from the outlet. The changes in the concentration of harmful gases can be obtained by reading the data from the data acquisition instrument.

[0022] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and these all fall within the protection scope of the present invention.

Claims

1. A device for detecting harmful gases in a physical model of the dehydrated and decomposed decay of freshwater mussels, characterized in that, Includes a water conveyance tunnel model and detection system. The water conveyance tunnel model adopts a cylindrical structure with sealing plates at both ends, namely a left sealing plate and a right sealing plate. The left sealing plate has an overflow hole, and the right sealing plate has an air inlet, an air outlet, and a multi-purpose hole. The water conveyance tunnel model is wrapped with an electric heating blanket on the outside, and temperature and humidity measuring holes are provided on the side walls. The water conveyance tunnel model is rotatably mounted on a support. The detection system includes a condenser, an H2S sensor, an NH3 sensor, and a TVOC sensor connected in series, as well as a data acquisition instrument. The air inlet of the condenser is connected to the air outlet, the outlet of the TVOC sensor is connected to the air inlet, and the data acquisition instrument collects measurement data from the H2S sensor, the NH3 sensor, and the TVOC sensor.

2. The harmful gas detection device based on the physical model of dehydration, death, and decay of freshwater shellfish according to claim 1, characterized in that, The water conveyance tunnel model is made of plexiglass.

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