Method for detecting concentration of gaseous extinguishing agent

Abstract

The invention discloses a gas extinguishing agent concentration detection method. The method comprises the steps that a gaseous extinguishing agent concentration testing system is built on site; when a fire occurs in a protection area and a fire extinguishing system is started, a flow control module on a gas extinguishing agent concentration testing system is started, gas samples in the protection area are continuously collected through a sampling probe, and the gas samples enter a multi-node one-way heat preservation sampling pipeline after being subjected to impurity filtration and constant-temperature adjustment through a pretreatment module; and detecting the concentration of the gas extinguishing agent by using a concentration testing module, and the like. By arranging the sampling probe, the preprocessing module, the multi-node one-way heat preservation sampling pipeline, the flow control module and the concentration testing module, a combined scheme of on-site continuous sampling and online real-time analysis is constructed, and the limitation of a traditional concentration testing method is broken through; the problems that a traditional concentration testing method is narrow in application range, high in testing cost, incapable of being matched with a novel fire extinguishing agent and poor in real-time performance are solved, and on-site, continuous and accurate concentration monitoring of various gas fire extinguishing agents is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas fire extinguishing system detection, and particularly relates to a concentration testing method suitable for various types of gas fire extinguishing agents (including new environmentally friendly fire extinguishing agents), and especially suitable for real-time and continuous concentration monitoring scenarios in fire extinguishing sites. BACKGROUND

[0002] With the implementation of environmental protection regulations, traditional gas fire extinguishing agents with ozone-depleting effect and greenhouse effect need to be gradually replaced, and therefore it is urgent to develop new environmentally friendly gas fire extinguishing agents. In the development of new environmentally friendly gas fire extinguishing agents, testing the fire extinguishing concentration of the fire extinguishing agent is a key work. There are mainly two methods for testing the concentration of existing gas fire extinguishing agents: single sampling analysis method based on gas chromatography and continuous analysis method based on spectrum. The continuous analysis method based on spectrum can realize real-time concentration testing, but needs to know the characteristic absorption peak of the sample to be tested in advance. For new gas fire extinguishing agents and their complex fire field decomposition products, this method is more restrictive. Although the single sampling analysis method based on gas chromatography can quantitatively and qualitatively analyze complex unknown samples, it cannot be continuously analyzed. Therefore, it is necessary to develop a gas fire extinguishing agent concentration detection method that combines the advantages of the above two methods. SUMMARY

[0003] In order to solve the above problems, the purpose of the present application is to provide a gas fire extinguishing agent concentration detection method.

[0004] In order to achieve the above purpose, the gas fire extinguishing agent concentration detection method provided by the present application comprises the following steps in sequence:

[0005] 1) Field construction of a gas fire extinguishing agent concentration testing system; the system comprises a flow control module, a multi-node one-way heat preservation sampling pipeline, a one-way valve, a pretreatment module, a sampling probe, an optical detection observation window with a silica gel sealed sampling port, and a concentration testing module; wherein a plurality of one-way valves are provided as nodes at equal intervals on the multi-node one-way heat preservation sampling pipeline, and a node interval is formed between any two adjacent nodes; an optical detection observation window with a silica gel sealed sampling port is provided on each node interval to provide a sample detection channel for the concentration testing module; one end of the multi-node one-way heat preservation sampling pipeline is connected to the flow control module, and the other end is connected to the sampling probe through the pretreatment module, and the sampling probe is placed in the protection zone;

[0006] 2) When a fire occurs in the protection zone and the fire extinguishing system is started, the flow control module of the above gas fire extinguishing agent concentration testing system is turned on, and the gas samples in the protection zone are continuously collected by the sampling probe, and after impurity filtration and constant temperature regulation by the pretreatment module, the samples enter the multi-node one-way heat preservation sampling pipeline;

[0007] 3) The concentration test module detects the concentration of the gaseous extinguishing agent in the gas sample in each node interval of the multi-node one-way heat preservation sampling pipeline through the optical detection observation window of each silica gel sealed sampling port.

[0008] The flow control module adopts a peristaltic pump, and the sampling flow is 80-1000 mL / min, with a fluctuation control within ±5%.

[0009] The multi-node one-way heat preservation sampling pipeline is provided with 5-100 one-way valves as nodes, so that the multi-node one-way heat preservation sampling pipeline is equally divided into 5-100 node intervals, the inner diameter of the multi-node one-way heat preservation sampling pipeline is 5-20 mm, and the length is not less than the volume of the required continuous collection divided by the cross-sectional area of the pipeline.

[0010] The pretreatment module is composed of an external electric heating cylinder and an internal filter core.

[0011] The sampling probe is made of 316L stainless steel material and is installed at the top, middle or bottom of the protection zone.

[0012] The optical detection observation window of the silica gel sealed sampling port comprises a main body, a silica gel sealed sampling port is arranged at the upper end of the main body, and a sample inlet and a sample outlet are arranged on the left and right side surfaces respectively.

[0013] The concentration test module comprises an optical test instrument and a gas chromatography test instrument; wherein the optical test instrument adopts at least one of a Fourier infrared test instrument and a Raman spectrum test instrument; and the gas chromatography test instrument adopts at least one of a gas mass spectrometer and a gas chromatograph.

[0014] Compared with the prior art, the gaseous extinguishing agent concentration detection method provided by the present application has the following beneficial effects:

[0015] (1) The present application can solve the problem that the traditional extinguishing agent concentration test method is only limited to a single or several extinguishing agents by using the combination scheme of "on-site continuous sampling + online real-time analysis", which greatly expands the types and quantities of detectable extinguishing agents.

[0016] (2) The present application can realize two modes of in-situ real-time monitoring and indirect sampling test, and combines the advantages of the two modes.

[0017] (3) The flow control module can be used to control the sampling speed of the gas sample, and in cooperation with the aperture and length of the multi-node one-way heat preservation sampling pipeline, the continuous sampling time can be controlled.

[0018] (4) The one-way valve used on the multi-node one-way heat preservation sampling pipeline can effectively prevent the backflow of the gas sample, and at the same time, the heat preservation measures provided by the pretreatment module ensure the accuracy and consistency of the gaseous extinguishing agent concentration test. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the gas extinguishing agent concentration testing system provided by the present invention.

[0021] Figure 2 This is a schematic diagram of the optical detection observation window structure with a silicone-sealed sampling port provided by the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The method for detecting the concentration of gaseous fire extinguishing agents provided by this invention includes the following steps performed in sequence:

[0024] 1) On-site setup such as Figure 1 The system shown is a gas extinguishing agent concentration testing system. The system includes a flow control module 1, a multi-node unidirectional insulated sampling pipeline 2, one-way valves 3, a pretreatment module 4, a sampling probe 5, an optical detection and observation window 6 with a silicone-sealed sampling port, and a concentration testing module. The multi-node unidirectional insulated sampling pipeline 2 has multiple one-way valves 3 spaced at equal intervals as nodes, forming a node interval between adjacent nodes. Each node interval has an optical detection and observation window 6 with a silicone-sealed sampling port, providing a sample detection channel for the concentration testing module. One end of the multi-node unidirectional insulated sampling pipeline 2 is connected to the flow control module 1, and the other end is connected to the sampling probe 5 via the pretreatment module 4, with the sampling probe 5 placed within a protected area.

[0025] 2) When a fire occurs in the protected area and the fire extinguishing system is activated, the flow control module 1 on the gas extinguishing agent concentration testing system is turned on. The gas sample in the protected area is continuously collected through the sampling probe 5. After impurity filtration and constant temperature adjustment by the pretreatment module 4, the sample enters the multi-node unidirectional heat preservation sampling pipeline 2.

[0026] 3) The concentration test module detects the concentration of gaseous extinguishing agent in the gas sample in each node interval of the multi-node one-way heat preservation sampling pipeline 2 through the optical detection observation window 6 of each silica gel sealed sampling port. In this embodiment, the concentration of gaseous extinguishing agent can be detected by placing the detection head of the optical test instrument 7 (Fourier infrared test instrument and Raman spectrum test instrument) into the optical detection observation window 9, or by sampling through the silica gel sealed sampling port 10 on the upper side of the optical detection observation window 9 and then detecting by the gas chromatography test instrument 8 (gas mass spectrometer and gas chromatograph). The above-mentioned gaseous extinguishing agent concentration test system can monitor the concentration change of gaseous extinguishing agent in the protection zone within 4.71 minutes from the release of gaseous extinguishing agent according to the parameter setting, and can extend or shorten the detection time by adjusting the flow of the flow control module 1, and at the same time, the number of nodes can be adjusted to increase or decrease the number of detection points in the gaseous extinguishing agent concentration change process.

[0027] The flow control module 1 uses a peristaltic pump, and the sampling flow is 80-1000 mL / min, with a fluctuation control within ±5%. In this embodiment, the flow of the flow control module 1 is set to 100 mL / min.

[0028] The multi-node one-way heat preservation sampling pipeline 2 is provided with 5-100 one-way valves as nodes, so as to divide the multi-node one-way heat preservation sampling pipeline 2 into 5-100 node intervals at equal intervals, and the inner diameter of the multi-node one-way heat preservation sampling pipeline 2 is 5-20 mm, and the length is not less than the volume of the required continuous collection of gas divided by the cross-sectional area of the pipeline. In this embodiment, the aperture and length of the multi-node one-way heat preservation sampling pipeline 2 are 10 mm and 6000 mm, respectively.

[0029] The pretreatment module 4 is composed of an external electric heating cylinder and an internal filter core.

[0030] The sampling probe 5 is made of 316L stainless steel material and is installed at the top, middle or bottom of the protection zone.

[0031] As shown in Figure 2 The optical detection observation window 6 with a silica gel sealed sampling port includes a main body 9, and the upper end of the main body 9 is provided with a silica gel sealed sampling port 10, and the left and right sides are respectively provided with a sample inlet 11 and a sample outlet 12.

[0032] The concentration test module includes an optical test instrument 7 and a gas chromatography test instrument 8; wherein the optical test instrument 7 uses at least one of a Fourier infrared test instrument and a Raman spectrum test instrument; and the gas chromatography test instrument 8 uses at least one of a gas mass spectrometer and a gas chromatograph.

[0033] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of detecting the concentration of a gaseous fire extinguishing agent, characterized by: The gas extinguishing agent concentration detection method comprises the following steps in sequence: 1) Field construction of a gas extinguishing agent concentration test system; the system comprises a flow control module (1), a multi-node one-way heat preservation sampling pipeline (2), a one-way valve (3), a pretreatment module (4), a sampling probe (5), an optical detection observation window (6) with a silica gel sealed sampling port, and a concentration test module; wherein a plurality of one-way valves (3) are arranged as nodes on the multi-node one-way heat preservation sampling pipeline (2) at equal intervals, and a node interval is formed between any two adjacent nodes; an optical detection observation window (6) with a silica gel sealed sampling port is arranged on each node interval to provide a sample detection channel for the concentration test module; one end of the multi-node one-way heat preservation sampling pipeline (2) is connected to the flow control module (1), and the other end is connected to the sampling probe (5) through the pretreatment module (4), and the sampling probe (5) is arranged in the protection zone; 2) When the fire extinguishing system is started after a fire occurs in the protection zone, the flow control module (1) of the above-mentioned gas extinguishing agent concentration test system is opened, the gas samples in the protection zone are continuously collected through the sampling probe (5), and after impurity filtration and constant temperature regulation by the pretreatment module (4), the gas samples enter the multi-node one-way heat preservation sampling pipeline (2); 3) The concentration test module detects the gas extinguishing agent concentration in the gas samples in each node interval of the multi-node one-way heat preservation sampling pipeline (2) through each optical detection observation window (6) with a silica gel sealed sampling port.

2. The gas fire extinguisher concentration detection method according to claim 1, characterized by: The flow control module (1) uses a peristaltic pump, and the sampling flow rate is 80-1000 mL / min, with a fluctuation control within ±5%.

3. The gas fire extinguisher concentration detection method according to claim 1, characterized by: The multi-node one-way heat preservation sampling pipeline (2) is provided with 5-100 one-way valves as nodes, so that the multi-node one-way heat preservation sampling pipeline (2) is equally divided into 5-100 node intervals, the inner diameter of the multi-node one-way heat preservation sampling pipeline (2) is 5-20 mm, and the length is not less than the volume of the continuously collected gas divided by the cross-sectional area of the pipeline.

4. The gas fire extinguisher concentration detection method according to claim 1, characterized by: The pretreatment module (4) is composed of an external electric heating cylinder and an internal filter core.

5. The gas fire extinguisher concentration detection method according to claim 1, characterized by: The sampling probe (5) is made of 316L stainless steel and is installed at the top, middle or bottom of the protection zone.

6. The gas fire extinguisher concentration detection method according to claim 1, characterized by: The optical detection observation window (6) with a silica gel sealed sampling port comprises a main body (9), the upper end of the main body (9) is provided with a silica gel sealed sampling port (10), and sample inlets (11) and sample outlets (12) are arranged on the left and right sides of the main body (9), respectively.

7. The gas fire extinguisher concentration detection method according to claim 1, characterized by: The concentration test module comprises an optical test instrument (7) and a gas chromatography test instrument (8); wherein the optical test instrument (7) uses at least one of a Fourier infrared test instrument and a Raman spectrum test instrument; and the gas chromatography test instrument (8) uses at least one of a gas mass spectrometer and a gas chromatograph.

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