FTA analyzer dilution sample introduction device

Abstract

The utility model belongs to the technical field of FTA online analyzers, and particularly relates to a diluting and sampling device of an FTA analyzer. Comprising an instrument fan, a first instrument air ball valve, a second instrument air ball valve, an instrument air pressure reducing valve, a pressure gauge, an instrument air flow meter, an instrument air flow meter needle valve, a sampling probe, an integrated high-temperature electric tracing pipe cable, a sampling ball valve, a sample injection flow meter ball valve, an FTA analyzer, a pneumatic valve, a pneumatic control valve, a pressure transmitter, a sample injection flow meter, a mixing diluter and an ejector ball valve. The device comprises an ejector, an ejector pressure reducing valve, a bypass flowmeter, a return flowmeter, a return flowmeter ball valve, an ejector and a PLC (Programmable Logic Controller). According to the pretreatment dilution system, through the design of the connection relation among all the structures of the pretreatment dilution system, sample dilution is carried out on sample introduction gas under the condition that the concentration of the sample introduction gas is too high, the concentration of the sample gas is reduced to meet the sample introduction requirement of an instrument by mixing the diluted gas with combustible materials, and the measurement accuracy is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of FTA online analyzers, and particularly relates to a dilution injection device for an FTA analyzer. Background Art

[0002] Chemical industry production occupies an important position in national production, and its chemical products have greatly improved people's quality of life. Most of the chemicals used, processed and produced in chemical production are flammable, explosive, toxic and corrosive substances, which are likely to cause fires, explosions or poisoning, resulting in casualties and heavy property losses.

[0003] During the chemical production process, if the concentration of high-concentration VOCs gas exceeds the lower explosion limit, it may trigger an explosion accident, posing a major threat to personnel safety and equipment; in addition, it is very dangerous to sample and measure the injection gas when the concentration of the injection gas is too high. Therefore, using an FTA analyzer to dilute and sample the injection gas is an essential link in chemical safety production. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the technical problems existing in the background art. For this reason, a dilution injection device for an FTA analyzer is provided.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A dilution injection device for an FTA analyzer includes a sampling probe, an integrated high-temperature electric tracing heat pipe cable, a sampling ball valve, an injection flowmeter ball valve, a pneumatic valve, an injection flowmeter, a mixing diluter and an FTA analyzer;

[0007] The output end of the sampling probe is connected to the input end of the integrated high-temperature electric tracing heat pipe cable, the output end of the integrated high-temperature electric tracing heat pipe cable is connected to the input end of the sampling ball valve through a pipeline, the output end of the sampling ball valve is connected to the input end of the injection flowmeter ball valve through a pipeline, the output end of the injection flowmeter ball valve is connected to the input end of the pneumatic valve through a pipeline, the output end of the pneumatic valve is connected to the input end of the injection flowmeter through a pipeline, the output end of the injection flowmeter is connected to the first input end of the mixing diluter through a pipeline, and the output end of the mixing diluter is connected to the sample input end of the FTA analyzer through a pipeline.

[0008] The following is a further limited technical solution of the present utility model. A pressure transmitter is installed on the pipeline between the pneumatic valve and the sample injection flowmeter. The pressure transmitter is electrically connected to the PLC controller, and the PLC controller is electrically connected to the pneumatic control valve. The output end of the pneumatic control valve is connected to the pneumatic control end of the pneumatic valve through a pipeline. The input end of the pneumatic control valve is connected to the output end of the instrument air ball valve II through a pipeline. The input end of the instrument air ball valve II is connected to the output end of the instrument air ball valve I through a pipeline. The input end of the instrument air ball valve I is connected to the instrument air blower, and the PLC controller is electrically connected to the sample injection flowmeter.

[0009] The following is a further limited technical solution of the present utility model, which further includes an instrument air blower, an instrument air ball valve I, an instrument air ball valve II, an instrument air pressure reducing valve, an instrument air flowmeter, and an instrument air flowmeter needle valve;

[0010] The output end of the instrument air blower is connected to the input end of the instrument air ball valve I through a pipeline. The output end of the instrument air ball valve I is connected to the input end of the instrument air ball valve II through a pipeline. The output end of the instrument air ball valve II is connected to the input end of the instrument air pressure reducing valve through a pipeline. The output end of the instrument air pressure reducing valve is connected to the input end of the instrument air flowmeter through a pipeline. The output end of the instrument air flowmeter is connected to the input end of the instrument air flowmeter needle valve through a pipeline. The output end of the instrument air flowmeter needle valve is connected to the second input end of the mixing and dilution device through a pipeline.

[0011] The following is a further limited technical solution of the present utility model. A pressure gauge is installed on the pipeline between the instrument air pressure reducing valve and the instrument air flowmeter. The pressure gauge is electrically connected to the PLC controller, and the PLC controller is electrically connected to the instrument air pressure reducing valve and the instrument air flowmeter.

[0012] The following is a further limited technical solution of the present utility model. The sample output end of the FTA analyzer is connected to the PP return pipe through a pipeline. The output end of the mixing and dilution device is connected to the input end of the return flowmeter through a pipeline. The output end of the return flowmeter is connected to the input end of the return flowmeter ball valve through a pipeline. The output end of the return flowmeter ball valve is connected to the first input end of the ejector through a pipeline. The output end of the ejector is connected to the PP return pipe. The return flowmeter is electrically connected to the PLC controller.

[0013] The following is a further limited technical solution of the present utility model. The second input end of the ejector is connected to the output end of the bypass flowmeter. The input end of the bypass flowmeter is connected to the output end of the sample injection flowmeter ball valve through a pipeline. The bypass flowmeter is electrically connected to the PLC controller.

[0014] The following are the further defined technical solutions of the present utility model. The pipeline of the second input end of the ejector is connected to the output end of the ejector pressure reducing valve. The input end pipeline of the ejector pressure reducing valve is connected to the output end of the ejector ball valve. The input end pipeline of the ejector ball valve is connected to the output end of the instrument air ball valve I. The input end pipeline of the instrument air ball valve I is connected to the instrument air blower.

[0015] Compared with the prior art, the present utility model has the following technical effects:

[0016] Through the design of the connection relationship between the various structures of the pretreatment dilution system (instrument air blower, instrument air ball valve I, instrument air ball valve II, instrument air pressure reducing valve, pressure gauge, instrument air flowmeter, instrument air flowmeter needle valve, sampling probe, integrated high-temperature electric tracing heat cable, sampling ball valve, sample injection flowmeter ball valve, pneumatic valve, air control valve, pressure transmitter, sample injection flowmeter, mixing diluter, ejector ball valve, ejector pressure reducing valve, bypass flowmeter, return flowmeter, return flowmeter ball valve, ejector, PLC controller), the present utility model realizes the sample dilution of the sample injection gas when the concentration of the sample injection gas is too high, solves the problem of inaccurate measurement of high-concentration VOCs exceeding the lower explosion limit percentage, and reduces the sample gas concentration to the instrument sample injection requirement by using the dilution gas to mix the combustibles, thereby enhancing the measurement accuracy.

[0017] The following further describes the present utility model in conjunction with the drawings and embodiments. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a simplified connection relationship diagram of the structure of the present utility model.

[0020] Reference numerals: 1, instrument air blower; 2, instrument air ball valve I; 3, instrument air ball valve II; 4, instrument air pressure reducing valve; 5, pressure gauge; 6, instrument air flowmeter; 7, instrument air flowmeter needle valve; 8, sampling probe; 9, integrated high-temperature electric tracing heat cable; 10, sampling ball valve; 11, sample injection flowmeter ball valve; 12, FTA analyzer; 13, pneumatic valve; 14, air control valve; 15, pressure transmitter; 16, sample injection flowmeter; 17, mixing diluter; 18, ejector ball valve; 19, ejector pressure reducing valve; 20, bypass flowmeter; 21, return flowmeter; 22, return flowmeter ball valve; 23, ejector; 24, PLC controller. Specific Embodiments

[0021] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0022] In the description of the present utility model, it should be understood that the terms "one" and "two" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "one" or "two" may explicitly or implicitly include at least one of such features.

[0023] In the embodiments of the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0024] As Figure 1 shown, this embodiment provides a dilution injection device for an FTA analyzer, which consists of an instrument blower 1, an instrument air ball valve 1 2, an instrument air ball valve 2 3, an instrument air pressure reducing valve 4, a pressure gauge 5, an instrument air flowmeter 6, an instrument air flowmeter needle valve 7, a sampling probe 8, an integrated high-temperature electric tracing heat cable 9, a sampling ball valve 10, an injection flowmeter ball valve 11, an FTA analyzer 12, a pneumatic valve 13, a pneumatic control valve 14, a pressure transmitter 15, an injection flowmeter 16, a mixing diluter 17, an ejector ball valve 18, an ejector pressure reducing valve 19, a bypass flowmeter 20, a return flowmeter 21, a return flowmeter ball valve 22, an ejector 23, a PLC controller 24, and so on.

[0025] Sampling system: sampling probe 8, integrated high-temperature electric tracing heat cable 9.

[0026] Pretreatment dilution system: instrument fan 1, instrument air ball valve 1 2, instrument air ball valve 2 3, instrument air pressure reducing valve 4, pressure gauge 5, instrument air flowmeter 6, needle valve of instrument air flowmeter 7, sampling probe 8, integrated high-temperature electric tracing heat cable 9, sampling ball valve 10, sample inlet flowmeter ball valve 11, pneumatic valve 13, pneumatic control valve 14, pressure transmitter 15, sample inlet flowmeter 16, mixing and dilution unit 17, ejector ball valve 18, ejector pressure reducing valve 19, bypass flowmeter 20, return flowmeter 21, return flowmeter ball valve 22, ejector 23, PLC controller 24.

[0027] Instrument detection system: FTA analyzer 12.

[0028] Working process: The sampling probe 8 is inserted into the process pipeline to a depth of 1 / 3 of the inner diameter to take a representative sample (high-concentration VOCs gas). After sampling, the sample passes through the integrated high-temperature electric tracing heat cable 9 and flows through the sampling ball valve 10, sample inlet flowmeter ball valve 11, pneumatic valve 13, pressure transmitter 15, and sample inlet flowmeter 16 to reach the mixing and dilution unit 17, where it is mixed and diluted with the dilution gas, and then reaches the FTA analyzer 12 for sample analysis.

[0029] During the above working process, the integrated high-temperature electric tracing heat cable 9 is heated to ensure that the pretreated sample is in a gaseous state throughout the process. The sample passes through the sampling ball valve 10, through the sample inlet flowmeter ball valve 11 to the pressure transmitter 15. The pressure transmitter 15 displays the current real-time pressure change, and then enters the mixing and dilution unit 17 through the sample inlet flowmeter 16. During the sample flow process, through the pressure value set by the pressure transmitter 15 and the signal feedback connected to the PLC controller 24, the opening of the pneumatic valve 13 is adjusted through the signal feedback of the pneumatic control valve 14 connected to the PLC controller 24 through the pressure transmitter 15 to change the sample flow rate, so that it enters the mixer at a set flow rate of 11 L / h set by the sample inlet flowmeter 16; at the same time, start the instrument fan 1 (i.e., air compressor) to connect the instrument air. After passing through the instrument air ball valve 1 2 and instrument air ball valve 2 3 to the instrument air pressure reducing valve 4, the instrument air pressure is adjusted by the instrument air pressure reducing valve 4, and then passes through the pressure gauge 5. The pressure gauge 5 displays the current pressure value in real time, and then passes through the instrument air flowmeter 6. By setting the value of the instrument air flowmeter 6, the current instrument air flow is fed back, and the instrument air flow rate is adjusted through the instrument air needle valve, so that the instrument air flow rate is stabilized at the set flow rate of 250 L / h set by the flowmeter and enters the mixing and dilution unit 17, completing the sample dilution in proportion, so that the concentration of the sample entering the FTA analyzer 12 is reduced, and the measurement is more stable and accurate.

[0030] A quick loop is formed by a return flowmeter 21, a return flowmeter ball valve 22, and an ejector 23. The ejector 23 uses instrument air as its power source. Through an ejector ball valve 18 and an ejector pressure reducing valve 19, the ejector 23 has a stable intake air pressure and can ensure the purity of the instrument air. Its main function is to be able to extract samples and introduce the samples into the FTA analyzer 12 for analysis. After the sample analysis work is completed, the ejector 23 will also eject the analyzed samples and send the samples back to the process pipeline through a PP return pipe. Such a design ensures that no gas diffuses into the current working environment, thereby avoiding environmental pollution problems. At the same time, the sample forms a quick loop through a bypass flowmeter 20 and is sent back to the process pipeline through the ejector 23, reducing the response time of sample transmission. It should be noted that the control algorithms and programs involved in the working process of this embodiment are not within the protection scope of the present utility model, and the control algorithms and programs involved are all prior art and are only used for those skilled in the art to understand the working process of this embodiment.

[0031] Compared with other types of analyzers, such as FID analyzers, etc., after the sample measurement is completed, the data is not accurate enough. In this embodiment, the FTA analyzer 12 dilutes the sample in a certain proportion in the mixing diluter 17, and then calculates the current sample concentration through proportion calculation. The concentration is output to the PLC controller 24 through a 4-20mA signal to obtain the lower explosion limit value (0-2000% LEL) and the corresponding PPM value (0-1000000 PPM) after dilution according to the proportion. This enhances the measurement accuracy of the FTA analyzer 12, and the sample after the measurement is directly returned to the process pipeline. Compared with directly discharging into the measurement environment, the product design of the present utility model reduces pollution and is more environmentally friendly. It should be noted that the structure of the FTA analyzer 12 itself is not within the protection scope of the present utility model, and the FTA analyzer 12 is prior art and is only used for those skilled in the art to understand the application of the FTA analyzer 12.

[0032] The above is only a preferred embodiment of the present utility model and does not impose any form of limitation on the present utility model. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. Therefore, all equivalent changes made according to the shape, structure, and principle of the present utility model without departing from the content of the technical solution of the present utility model should be covered by the protection scope of the present utility model.

Claims

1. A dilution injection device for an FTA analyzer, characterized in that, It includes a sampling probe (8), an integrated high-temperature electric tracing heat pipe cable (9), a sampling ball valve (10), an injection flowmeter ball valve (11), a pneumatic valve (13), an injection flowmeter (16), a mixing and dilution device (17) and an FTA analyzer (12); The output end of the sampling probe (8) is connected to the input end of the integrated high-temperature electric tracing heat pipe cable (9). The output end of the integrated high-temperature electric tracing heat pipe cable (9) is connected to the input end of the sampling ball valve (10) through a pipeline. The output end of the sampling ball valve (10) is connected to the input end of the injection flowmeter ball valve (11) through a pipeline. The output end of the injection flowmeter ball valve (11) is connected to the input end of the pneumatic valve (13) through a pipeline. The output end of the pneumatic valve (13) is connected to the input end of the injection flowmeter (16) through a pipeline. The output end of the injection flowmeter (16) is connected to the first input end of the mixing and dilution device (17) through a pipeline. The output end of the mixing and dilution device (17) is connected to the sample input end of the FTA analyzer (12) through a pipeline.

2. The dilution injection device of an FTA analyzer according to claim 1, characterized in that, A pressure transmitter (15) is installed on the pipeline between the pneumatic valve (13) and the injection flowmeter (16). The pressure transmitter (15) is electrically connected to a PLC controller (24). The PLC controller (24) is electrically connected to a pneumatic control valve (14). The output end of the pneumatic control valve (14) is connected to the pneumatic control end of the pneumatic valve (13) through a pipeline. The input end of the pneumatic control valve (14) is connected to the output end of an instrument air ball valve two (3). The input end of the instrument air ball valve two (3) is connected to the output end of an instrument air ball valve one (2). The input end of the instrument air ball valve one (2) is connected to an instrument air blower (1). The PLC controller (24) is electrically connected to the injection flowmeter (16).

3. The dilution injection device of an FTA analyzer according to claim 1, characterized in that, It also includes an instrument air blower (1), an instrument air ball valve one (2), an instrument air ball valve two (3), an instrument air pressure reducing valve (4), an instrument air flowmeter (6) and an instrument air flowmeter needle valve (7); The output end of the instrument air blower (1) is connected to the input end of the instrument air ball valve one (2) through a pipeline. The output end of the instrument air ball valve one (2) is connected to the input end of the instrument air ball valve two (3) through a pipeline. The output end of the instrument air ball valve two (3) is connected to the input end of the instrument air pressure reducing valve (4) through a pipeline. The output end of the instrument air pressure reducing valve (4) is connected to the input end of the instrument air flowmeter (6) through a pipeline. The output end of the instrument air flowmeter (6) is connected to the input end of the instrument air flowmeter needle valve (7) through a pipeline. The output end of the instrument air flowmeter needle valve (7) is connected to the second input end of the mixing and dilution device (17) through a pipeline.

4. The dilution injection device of an FTA analyzer according to claim 3, characterized in that, A pressure gauge (5) is installed on the pipeline between the instrument air pressure reducing valve (4) and the instrument air flowmeter (6). The pressure gauge (5) is electrically connected to the PLC controller (24). The PLC controller (24) is electrically connected to the instrument air pressure reducing valve (4). The PLC controller (24) is electrically connected to the instrument air flowmeter (6).

5. The dilution injection device of an FTA analyzer according to claim 1, characterized in that The pipeline at the sample output end of the FTA analyzer (12) is connected to the PP return pipe. The pipeline at the output end of the mixing and diluting device (17) is connected to the input end of the return flowmeter (21). The pipeline at the output end of the return flowmeter (21) is connected to the input end of the return flowmeter ball valve (22). The pipeline at the output end of the return flowmeter ball valve (22) is connected to the first input end of the ejector (23). The pipeline at the output end of the ejector (23) is connected to the PP return pipe. The return flowmeter (21) is electrically connected to the PLC controller (24).

6. The dilution injection device of an FTA analyzer according to claim 5, wherein The pipeline at the second input end of the ejector (23) is connected to the output end of the bypass flowmeter (20). The input end of the bypass flowmeter (20) is connected to the output end of the sample injection flowmeter ball valve (11). The bypass flowmeter (20) is electrically connected to the PLC controller (24).

7. The dilution injection device of an FTA analyzer according to claim 5, characterized in that, The pipeline at the second input end of the ejector (23) is connected to the output end of the ejector pressure reducing valve (19). The pipeline at the input end of the ejector pressure reducing valve (19) is connected to the output end of the ejector ball valve (18). The pipeline at the input end of the ejector ball valve (18) is connected to the output end of the instrument air ball valve 1 (2). The input end of the instrument air ball valve 1 (2) is connected to the instrument air blower (1).

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