System for analyzing continuous flow of hydrogen sulfide in air in workplace

Abstract

The utility model discloses a continuous flow analysis system for hydrogen sulfide in air in a workplace, and relates to the technical field of hydrogen sulfide analysis. The continuous flow analysis system for the hydrogen sulfide in the air of the workplace comprises a gas-liquid driving module, a chemical reaction module, an optical detection module and an analysis module. The driving module comprises a sample injector, a sampling needle, a peristaltic pump and a plurality of conveying pipes; the sample injector is connected with the peristaltic pump through the sampling needle, and the delivery pump is connected with the reaction module; a gas injector, an on-line mixer, a three-way joint and an on-line waste gas discharger are arranged in the reaction module; the detection module is used for measuring the absorption of light with specific wavelength by the colored compound on the basis of a light absorption principle and converting a light signal into an electric signal; the analysis module receives the electric signal and processes data to calculate the hydrogen sulfide content. The utility model aims to realize efficient and accurate hydrogen sulfide detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen sulfide analysis, in particular to a continuous flow analysis system for hydrogen sulfide in workplace air. BACKGROUND

[0002] Hydrogen sulfide gas is extremely toxic and can easily cause acute poisoning, with symptoms of rapid onset, rapid disease progression and extremely high mortality. In the field of industrial production, such as chemical processing, coal mining and urban sewage pipeline cleaning, it is possible to come into contact with hydrogen sulfide and then cause hydrogen sulfide poisoning accidents. The presence of hydrogen sulfide poses a serious occupational health risk, so the prevention and control of hydrogen sulfide poisoning accidents are crucial.

[0003] In terms of monitoring the concentration of hydrogen sulfide in workplace air, the current national standard for determination of hydrogen sulfide in workplace air in China is the silver nitrate visual colorimetric method in GBZ / T160.33-2004. However, this method has many limitations, such as insufficient accuracy and precision due to semi-quantitative analysis, large reagent consumption and toxicity, frequent manual operation which can harm the operator, and slow analysis process. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide a continuous flow analysis system for hydrogen sulfide in workplace air to solve the problems of slow analysis speed, large sample and reagent consumption, frequent manual operation, and poor accuracy and precision of the existing visual colorimetric method. The specific scheme is as follows:

[0005] The continuous flow analysis system for hydrogen sulfide in workplace air comprises a driving module, a reaction module, a detection module and an analysis module.

[0006] The driving module comprises a sample injector, a sampling needle, a peristaltic pump, a first conveying pipe, a second conveying pipe, a third conveying pipe, a fourth conveying pipe, a fifth conveying pipe and a sixth conveying pipe. The sample injector is connected to the peristaltic pump through the sampling needle, and the peristaltic pump is connected to the reaction module.

[0007] The reaction module comprises a reaction flow path connected with the peristaltic pump; the reaction flow path comprises a gas injector, a first online mixer, a three-way joint, a second online mixer, and an online waste gas discharger connected in sequence; the first delivery pipe, the second delivery pipe, the third delivery pipe, the fourth delivery pipe, and the fifth delivery pipe are pumped by the peristaltic pump; one end of each of the second delivery pipe, the third delivery pipe, the fourth delivery pipe, and the fifth delivery pipe is connected with the gas injector, the other end of the second delivery pipe is connected with a waste liquid bottle, the other end of the third delivery pipe is connected with the sample injector through the sampling needle, the other end of the fourth delivery pipe is suspended in air, and the fifth delivery pipe is connected with a first reagent bottle containing N-dimethyl-p-phenylenediamine hydrochloride hydrochloric acid solution containing a lubricant; one end of the first delivery pipe is connected with the three-way joint, and the other end of the first delivery pipe is connected with a second reagent bottle containing ferric chloride hydrochloric acid solution; the upper end outlet of the online waste gas discharger is connected with a waste liquid bottle, and the lower end outlet of the online waste gas discharger is connected with the detection module;

[0008] The detection module can measure the absorption degree of the generated colored complex in the sample to specific wavelength light by using the light absorption principle, can convert the measured light signal into an electric signal, and can send the electric signal to the outside;

[0009] The analysis module is electrically connected with the detection module, can receive the electric signal sent by the detection module, and can process the data contained in the electric signal to calculate the content of hydrogen sulfide in the sample.

[0010] Preferably, the detection module comprises a detection cell, a light source, and a photoelectric sensor electrically connected with the analysis module; the inlet end of the detection cell is connected with the lower end outlet of the online waste gas discharger, and the outlet end of the detection cell is connected with a waste liquid bottle through a sixth delivery pipe; the detection cell is respectively connected with the light source and the photoelectric sensor at two ends; and the sixth delivery pipe passes through the peristaltic pump.

[0011] Further, a circuit control module is further included; the circuit control module is connected with the driving module, the reaction module, the detection module, and the analysis module, and is used for circuit control of the driving module, the reaction module, the detection module, and the analysis module.

[0012] Preferably, the inner diameters of the first online mixer and the second online mixer are 1.5 mm to 1.8 mm.

[0013] Preferably, the first online mixer and the second online mixer are made of acid- and alkali-resistant glass.

[0014] One or more technical solutions provided in the application have at least the following technical effects or advantages:

[0015] The system adopts advanced bubble injection technology to ensure complete mixing of samples during the reaction, effectively prevent cross contamination between different samples, and promote complete reaction of the samples and reduce sample residue in the pipeline, thereby significantly improving reaction efficiency and analysis accuracy; the system uses a steady-state detection mode to ensure detection after the reaction is completed, further improving the accuracy and reliability of the detection results; the mixing, reaction and detection processes of the samples and reagents are continuous and seamless, enabling rapid completion of analysis of a large number of samples; the peristaltic pump provided by the system can strictly control the amount of samples and reagents, greatly reducing the consumption of reagents and samples, and effectively avoiding resource waste; the system performs sample addition, mixing and detection in a closed pipeline, reducing the harm to operators caused by frequent manual operations, and avoiding hydrogen sulfide loss and environmental pollution caused by volatilization. In summary, the system can solve the problems of slow operation process, large consumption of samples and reagents, frequent manual operation, and poor accuracy and precision of the existing visual colorimetric method.

[0016] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0018] Figure 1 is a structural schematic diagram of the hydrogen sulfide continuous flow analysis system in the workplace air of the present application.

[0019] Figure 2 is a principle block diagram of the hydrogen sulfide continuous flow analysis system in the workplace air of the present application.

[0020] In the figure: 1-sample injector; 2-sampling needle; 3-peristaltic pump; 301-first conveying pipe; 302-second conveying pipe; 303-third conveying pipe; 304-fourth conveying pipe; 305-fifth conveying pipe; 306-sixth conveying pipe; 4-gas injector; 5-first online mixer; 6-three-way joint; 7-second online mixer; 8-online waste gas discharger; 9-detection cell; 10-light source; 11-photoelectric sensor; 12-first reagent bottle; 13-second reagent bottle; W1-first waste liquid; W2-second waste liquid; W3-third waste liquid; R1-N-dimethyl-p-phenylenediamine hydrochloride hydrochloric acid solution; R2-ferric chloride hydrochloric acid solution; S-sample; G-air. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application. Obviously, the embodiments described in the present application are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Please refer to Figure 1 and Figure 2 , the continuous flow analysis system for hydrogen sulfide in workplace air, comprising a driving module, a reaction module, a detection module and an analysis module;

[0023] The driving module comprises a sample injector 1, a sampling needle 2, a peristaltic pump 3, a first conveying pipe 301, a second conveying pipe 302, a third conveying pipe 303, a fourth conveying pipe 304, a fifth conveying pipe 305 and a sixth conveying pipe 306; the sample injector 1 is connected with the peristaltic pump 3 through the sampling needle 2, and the peristaltic pump 3 is connected with the reaction module;

[0024] The reaction module comprises a reaction flow path connected with the peristaltic pump 3; the reaction flow path comprises a gas injector 4, a first online mixer 5, a three-way joint 6, a second online mixer 7, and an online waste gas discharger 8 connected in sequence; the first conveying pipe 301, the second conveying pipe 302, the third conveying pipe 303, the fourth conveying pipe 304, and the fifth conveying pipe 305 are pumped by the peristaltic pump 3; one end of each of the second conveying pipe 302, the third conveying pipe 303, the fourth conveying pipe 304, and the fifth conveying pipe 305 is connected with the gas injector 4, the other end of the second conveying pipe 302 is connected with a waste liquid bottle, the other end of the third conveying pipe 303 is connected with the sample injector 1 through the sampling needle 2, the other end of the fourth conveying pipe 304 is suspended in air G, and the fifth conveying pipe 305 is connected with a first reagent bottle 12 containing an N-dimethyl-p-phenylenediamine hydrochloride hydrochloric acid solution R1 containing a lubricant; one end of the first conveying pipe 301 is connected with the three-way joint 6, and the other end of the first conveying pipe 301 is connected with a second reagent bottle 13 containing an iron chloride hydrochloric acid solution R2; the upper end outlet of the online waste gas discharger 8 is connected with a waste liquid bottle, and the lower end outlet of the online waste gas discharger 8 is connected with the detection module;

[0025] The detection module can measure the degree of absorption of a specific wavelength of light by the colored complex generated in the sample S by using the light absorption principle, can convert the measured light signal into an electric signal, and can send the electric signal to the outside;

[0026] The analysis module is electrically connected with the detection module, can receive the electric signal sent by the detection module, and can process the data contained in the electric signal to calculate the content of hydrogen sulfide in the sample S.

[0027] With reference to Figure 1 , the detection module comprises a detection cell 9, a light source 10, and a photoelectric sensor 11 electrically connected with the analysis module; the inlet end of the detection cell 9 is connected with the lower end outlet of the online waste gas discharger 8, and the outlet end of the detection cell 9 is connected with a waste liquid bottle through a sixth conveying pipe 306; the detection cell 9 is connected with the light source 10 and the photoelectric sensor 11 at two ends respectively; and the sixth conveying pipe 306 passes through the peristaltic pump 3.

[0028] With reference to Figure 2 , the hydrogen sulfide continuous flow analysis system in the workplace air further comprises a circuit control module; the circuit control module is connected with the driving module, the reaction module, the detection module, and the analysis module, and is used for circuit control of the driving module, the reaction module, the detection module, and the analysis module.

[0029] In this embodiment, the inner diameter of the first online mixer 5 and the second online mixer 7 is 1.5mm-1.8mm.

[0030] In this embodiment, the first online mixer 5 and the second online mixer 7 are made of acid and alkali resistant glass material, which has good chemical inertness and good passability for complex samples and various reagents.

[0031] In combination with the drawings, Figure 1 The first waste liquid W1, the second waste liquid W2 and the third waste liquid W3 finally flow into the waste liquid bottle. The first reagent bottle 12 is filled with N-dimethyl-p-phenylenediamine hydrochloride hydrochloric acid solution R1 containing lubricant, and the second reagent bottle 13 is filled with ferric chloride hydrochloric acid solution R2.

[0032] In combination with the drawings, Figure 1 The hydrogen sulfide in the workplace air is continuously absorbed by the sample needle 2 of the automatic sampler 1. The sample S can be obtained by connecting a porous glass plate absorption tube containing triethanolamine sodium hydroxide absorption solution to an air collector, and pumping air at a flow rate of 0.5L / min for 15min. The hydrogen sulfide in the workplace air is absorbed by the triethanolamine sodium hydroxide absorption solution, and the obtained absorption solution is the sample S. The sample S and the reagent (R1, R2) are pushed into the reaction module by the peristaltic pump 3 through the delivery pipe (301-306). The sample S and the reagent (R1, R2) continuously flow in the closed pipeline and undergo color reaction. In this process, the fourth delivery pipe 304 on the peristaltic pump 3 introduces air G, which enters the liquid pipeline to form bubbles, so that the sample S and the reagent (R1, R2) are separated by the air bubbles formed by the air G according to a certain rule. The air bubbles are finally discharged from the online waste gas discharger 8 together with the second waste liquid W2.

[0033] In combination with the drawings, Figure 1 The hydrogen sulfide in the sample S reacts with the N-dimethyl-p-phenylenediamine hydrochloride hydrochloric acid solution R1 containing lubricant introduced by the fifth delivery pipe 305 and the ferric chloride hydrochloric acid solution R2 introduced by the first pump pipe 401 to generate a blue compound. The blue compound has maximum absorption at a wavelength of 660nm. The absorbance of the compound is measured by the photoelectric sensor 11, and the data is processed by the analysis module, so that the content of hydrogen sulfide in the sample can be obtained.

[0034] The hydrogen sulfide in the workplace air continuously flowing analysis system adopts continuous flow analysis technology, which detects in the state of chemical reaction dynamic balance. The system injects air bubbles in the reaction module to make the reaction more sufficient and the samples do not interfere with each other, so that the maximum sensitivity can be achieved, the sample concentration also reaches the maximum value, the sample residue can be effectively reduced, the quantitative detection can be achieved, the detection accuracy is high, the repeatability is good, the detection limit is low, the degree of automation is high, and batch detection is realized.

[0035] With reference to Figure 2 The circuit control module respectively controls the circuit of the gas-liquid driving module, the chemical reaction module, the optical detection module and the analysis module, so as to realize full online automation of hydrogen sulfide sample processing in the air of a workplace, and to realize automatic sample adding, mixing and detection and other functions, thereby ensuring the efficiency and accuracy of the analysis process. The comprehensive function coverage enables the system to continuously and stably determine the content of hydrogen sulfide without manual intervention, thereby greatly improving the efficiency and reliability of the analysis.

[0036] In addition, the design of the hydrogen sulfide continuous flow analysis system in the air of a workplace focuses on practicability and convenience, adopts small and light components, and connects the components through hoses, so that the components are independent of each other and easy to operate. Such a design not only saves space, but also facilitates daily maintenance and updating work. Whether it is system upgrading or fault elimination, it can be quickly and easily completed, ensuring long-term stable operation of the system. At the same time, the functions of online automatic sample adding, mixing and detection are carried out in a closed pipeline, reducing the loss of hydrogen sulfide due to volatilization and environmental pollution.

[0037] In summary, the hydrogen sulfide continuous flow analysis system in the air of a workplace can solve the problems of slow analysis speed, large sample and reagent consumption, manual operation throughout the process, and poor accuracy and precision of the existing visual colorimetric method.

[0038] The chemical raw materials involved in the present application are materials known in the prior art, and the present application does not improve the materials themselves.

[0039] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0040] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application also intends to include these modifications and variations.

Claims

1. A continuous flow analytical system for hydrogen sulfide in workplace air, characterized in that, The driving module, the reaction module, the detection module and the analysis module are included. The driving module includes a sample injector, a sampling needle, a peristaltic pump, a first conveying pipe, a second conveying pipe, a third conveying pipe, a fourth conveying pipe and a fifth conveying pipe. The reaction module includes a reaction flow path connected with the peristaltic pump. The reaction flow path includes a gas injector, a first online mixer, a three-way joint, a second online mixer and an online waste gas discharger connected in sequence. The second conveying pipe, the third conveying pipe, the fourth conveying pipe and the fifth conveying pipe are connected with the gas injector at one end.

2. The continuous flow analytical system for hydrogen sulfide in workplace air according to claim 1, wherein, The second conveying pipe is connected with a waste liquid bottle at the other end.

3. The continuous flow analytical system for hydrogen sulfide in workplace air according to claim 1, wherein, The third conveying pipe is connected with the sample injector through the sampling needle at the other end.

4. The continuous flow analytical system for hydrogen sulfide in workplace air according to claim 1, wherein, The fourth conveying pipe is suspended in air at the other end.

5. The continuous flow analytical system for hydrogen sulfide in workplace air according to claim 1, wherein, The fifth conveying pipe is connected with a first reagent bottle containing N-dimethyl-p-phenylenediamine hydrochloride hydrochloric acid solution containing lubricant. The first conveying pipe is connected with the three-way joint at one end. The first conveying pipe is connected with a second reagent bottle containing ferric chloride hydrochloric acid solution at the other end. The upper end outlet of the online waste gas discharger is connected with a waste liquid bottle. The lower end outlet of the online waste gas discharger is connected with the detection module. The detection module can measure the absorption degree of the generated colored complex in the sample to specific wavelength light by using the light absorption principle. The detection module can convert the measured light signal into an electrical signal and send the electrical signal externally. The analysis module is electrically connected with the detection module. The analysis module can receive the electrical signal sent by the detection module and process the data contained in the electrical signal to calculate the content of hydrogen sulfide in the sample. The detection module includes a detection cell, a light source and a photoelectric sensor electrically connected with the analysis module. The inlet end of the detection cell is connected with the lower end outlet of the online waste gas discharger. The outlet end of the detection cell is connected with a waste liquid bottle through a sixth conveying pipe. The two ends of the detection cell are respectively connected with the light source and the photoelectric sensor. The sixth conveying pipe passes through the peristaltic pump. The circuit control module is connected with the driving module, the reaction module, the detection module and the analysis module for circuit control of the driving module, the reaction module, the detection module and the analysis module. The inner diameter of the first online mixer and the second online mixer is 1.5mm-1.8mm. The first online mixer and the second online mixer are made of acid and alkali resistant glass material.

Images