An enclosed jet flow aerosol sampling device

Abstract

The application discloses a kind of gas type jet flow aerosol sampling device, it is related to jet flow aerosol sampling technical field, and its technical solution points are as follows: including support bracket, the end of the support bracket is vertically provided with front baffle, the front baffle is provided with the gas guide hole one that it is penetrated;The top of the support bracket is equipped with high-pressure sealed tank, and the gas cutoff valve is equipped between the gas inlet end of the high-pressure sealed tank and the gas guide hole one;Two gas sealing valves that are communicated with the inside of the high-pressure sealed tank are equipped on the lateral wall of the high-pressure sealed tank;The top of the support bracket and the top of the front baffle are all equipped with at least two lugs;The end of the front baffle and support bracket is connected in the mode of bolt;The gas cutoff valve, high-pressure sealed tank and support bracket are all made of Q345 steel material processing and production.This sampler uses shock wave to carry aerosol to remain in the inside of sampler, and completes collection by high-pressure water flow to carry aerosol particles.

Description

Technical Field

[0001] This invention relates to the field of jet aerosol sampling technology, and more specifically, to a gas-collecting jet aerosol sampling device. Background Technology

[0002] Existing aerosol samplers mainly include active and passive samplers. Active samplers, including total dust samplers and staged samplers, primarily consist of high-flow-rate pumps, flow meters, and dividers. The electronic components and mechanical structures within these instruments are unlikely to survive the extreme environments of high temperature and pressure near the explosion epicenter. Furthermore, the sampling process requires active activation, resulting in a slow response to shock waves and high instrument costs. Passive samplers currently primarily use sampling tubes for near-field sampling. However, the long and winding sampling tubes lead to significant aerosol particle deposition and affect airflow, ultimately impacting the total sample volume.

[0003] To address the aforementioned technical issues, the applicant has invented a gas-collecting jet aerosol sampling device. Summary of the Invention

[0004] The purpose of this invention is to provide a gas-collecting jet aerosol sampling device, which uses shock waves to carry aerosols into the sampler and collects them by high-pressure water flow carrying aerosol particles.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a gas-collecting jet aerosol sampling device, comprising a support bracket, a front baffle vertically provided at the end of the support bracket, and a gas guide hole through the front baffle; a high-pressure sealing tank provided at the top of the support bracket, and a gas shut-off valve provided between the gas inlet end of the high-pressure sealing tank and the gas guide hole; and two gas sealing valves communicating with the interior of the high-pressure sealing tank provided on the side wall of the high-pressure sealing tank.

[0006] The present invention is further configured such that at least two lifting lugs are provided on the top of the support bracket and the top of the front baffle.

[0007] The present invention is further configured such that the front baffle and the end of the support bracket are connected by bolts.

[0008] The present invention is further configured such that the gas shut-off valve, the high-pressure sealing tank and the support bracket are all made of Q345 steel.

[0009] The present invention is further configured such that: the wall thickness of the high-pressure sealing tank is:

[0010]

[0011] Where p is the design pressure of the high-pressure sealed tank, d is the wall thickness of the high-pressure sealed tank, and Di This represents the inner diameter of the high-pressure sealed tank, and [σ] is the allowable stress of the material. C2 represents the corrosion allowance, where C is the weld joint coefficient.

[0012] In summary, the beneficial effects of the present invention are: the present invention realizes a rapid sampling method for obtaining near-field aerosol samples under dynamic loading or other air jet generation scenarios; at the same time, compared with existing aerosol sampling devices, the mechanical structure and electronic components of this device are simple and reliable, and can withstand high temperature and high pressure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a gas-collecting jet aerosol sampling device according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the high-pressure sealing tank in an embodiment of the present invention;

[0015] Figure 3 This is a graph showing the relationship between the sampler wall thickness and overpressure in an embodiment of the present invention.

[0016] In the diagram: 1. Front baffle; 2. Gas shut-off valve; 3. High-pressure sealing tank; 4. Gas sealing valve; 5. Support bracket; 6. Lifting lug; 7. Gas vent one; 8. Gas vent two. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0018] Example: A gas-collecting jet aerosol sampling device, such as... Figures 1 to 3 As shown, the system includes a front baffle 1, a gas shut-off valve 2, a high-pressure sealing tank 3, a gas sealing valve 4, a support bracket 5, and lifting lugs 6. The front baffle 1 and the gas shut-off valve 2 are connected by high-temperature welding. The front baffle 1 and the support bracket 5 are connected by six M28 bolts. The bottom left and right sides of the front baffle 1 are fixed to the ground by two M28 bolts. A lifting lug 6 is installed on each of the top left and right sides of the front baffle 1. A circular vent hole 7 is opened in the center of the upper part of the front baffle 1. The front end of the gas shut-off valve 2 is high-temperature welded to the circular vent hole 7 of the front baffle 1. The rear end of the gas shut-off valve 2 is high-temperature welded to the high-pressure sealing tank 3. The high-pressure sealing tank 3 is as follows... Figure 2 As shown, two gas sealing valves 4 are welded at high temperature through two vent holes 8 at the upper end, and are fixed to the support bracket 5 on the left and right sides with M28 bolts; the bottom of the support bracket 5 is fixed to the ground with 6 M28 bolts, and two lifting lugs 6 are installed on the upper part of the tail of the support bracket 5. In this preferred embodiment, the gas shut-off valve 2, the high-pressure sealing tank 3, and the support bracket 5 are all made of Q345 steel.

[0019] To ensure normal operation in chemical explosion scenarios, dynamic loading, or other scenarios generating high-pressure air jets, the front baffle 1, gas shut-off valve 2, high-pressure sealing tank 3, and high-pressure flow meter (not labeled in the diagram) require a reasonable design of the wall thickness of the high-pressure sealing tank 3. This ensures its rigidity and sealing under high pressure. The wall thickness of the high-pressure sealing tank 3 should satisfy the internal pressure formula:

[0020]

[0021] Where p is the design pressure of high-pressure sealing tank 3, d is the wall thickness of high-pressure sealing tank 3, and D i This represents the inner diameter of the high-pressure sealed tank 3, where [σ] is the allowable stress of the material. C2 represents the corrosion allowance, where C is the weld joint coefficient. Based on the allowable stress of the Q345 steel material, the relationship between wall thickness and overpressure is calculated for different application scenarios as follows: Figure 3 As shown. Before and after sampling, the pressure difference Δp inside the high-pressure sealed container 3 was measured using a barometer. Then, according to the ideal gas law, the volume of gas collected is... In the formula p m Given standard atmospheric pressure, the volume of the received gas at standard atmospheric pressure can be calculated.

[0022] Working principle: After the sampling device is fully installed, open the gas sealing valve 4 and use a vacuum pump to evacuate the inside of the high-pressure sealing tank 3. At this time, the forward pressure difference of the gas shut-off valve 2 is less than one atmosphere, so the gas shut-off valve 2 remains sealed. After evacuation, close the gas sealing valve 4. Lift the sampling device into a fixed position using the four lifting lugs 6 installed above the front baffle 1 and support bracket 5, and fix it to the ground with eight M28 bolts or ground nails. The front baffle 1 faces the direction of the jet. The jet and aerosol particles enter the gas shut-off valve 2 through the central circular hole of the front baffle 1. The gas shut-off valve 2 has the function of guiding airflow in the forward direction and sealing in the reverse direction. When the high-pressure jet passes through the gas shut-off valve 2 and reaches the inside of the high-pressure sealed container 3, a reflected overpressure is generated at the end face of the high-pressure sealed container 3, causing the pressure difference on both sides of the gas shut-off valve 2 to reverse. At this time, the valve is sealed to prevent gas backflow, and the jet aerosol is retained in the high-pressure sealed container 3, along with the aerosol particles it carries. After collecting the aerosol sample, a gas pressure gauge is connected to the gas sealing valve 4 to measure the collected gas pressure. Then, both gas sealing valves 4 are opened, and a high-pressure water flow is injected from one of the gas sealing valves 4 to flush the inside of the high-pressure sealed container 3. The high-pressure water flow carrying aerosol particles flows out from the other gas sealing valve 4, and the aerosol sample is collected.

[0023] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An enclosed jet aerosol sampling device characterized by: It includes support bracket (5), the end of support bracket (5) is vertically provided with front baffle (1), and the front baffle (1) is provided with gas guide hole one (7) penetrating it;The top of support bracket (5) is provided with high-pressure sealed tank (3), and the gas cut-off valve (2) is arranged between the gas inlet end of high-pressure sealed tank (3) and gas guide hole one (7);Two gas sealing valves (4) are arranged on the sidewall of high-pressure sealed tank (3) and communicate with the inside thereof; At least two lifting lugs (6) are arranged on the top of support bracket (5) and the top of front baffle (1); The end of front baffle (1) and support bracket (5) is connected by bolts; The wall thickness of high-pressure sealed tank (3) is: ； wherein, P is the design pressure for the high pressure containment vessel (3), t is the wall thickness for the high pressure containment vessel, D is the inside diameter of the high pressure containment vessel, S is the allowable stress of the material, Cw is the weld joint coefficient, E is the corrosion allowance.

2. A gas-collecting fluidic aerosol sampler according to claim 1, wherein: The gas cut-off valve (2), high-pressure sealed tank (3) and support bracket (5) are all made of Q345 steel material.

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