FTA analyzer stable-pressure sampling device

Abstract

The utility model belongs to the technical field of on-line analysis of tail gas emission, and particularly relates to a stable-pressure sampling device of an FTA analyzer. Comprising a sampling probe, a high-temperature electric heat tracing integrated pipe cable, a stop valve, a bypass filter, a sample injection pressure reducing valve, a sample injection needle valve, a sample injection pneumatic valve, a sample injection pressure transmitter, a bypass flowmeter, an instrument air pressure reducing valve, an I / P controller, a PID control unit, an FTA analyzer, a box body heater, a pretreatment heat preservation box and the like. According to the pretreatment pressure stabilizing system disclosed by the utility model, through the design of the connection relation among the structures of the pretreatment pressure stabilizing system, pressure stabilizing sampling can be realized under the condition of pipeline pressure fluctuation, and the measurement accuracy of real-time monitoring of chemical tail gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of on-line analysis of tail gas emissions, and particularly relates to a constant-pressure sampling device for an FTA analyzer. Background Art

[0002] The lower explosive limit gas analyzer for chemical tail gas emissions is an important device for monitoring the concentration of combustible gases in chemical tail gas. Its main purpose is to ensure that the concentration of combustible gases in the tail gas does not exceed the lower explosive limit, thereby preventing explosion accidents.

[0003] During the chemical production process, the tail gas may contain various flammable and explosive gases. If the concentration of these gases exceeds the explosion limit, explosion accidents may occur, posing a major threat to personnel safety and equipment. In addition, during the monitoring of chemical tail gas, due to the fluctuation of pipeline pressure, the measured value of the instrument will be inaccurate. Therefore, using a lower explosive limit gas analyzer to measure accurately and monitor chemical tail gas in real time is an essential link in chemical safety production. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the measured value of the instrument is inaccurate or fluctuates due to the fluctuation of pipeline pressure in the background art. For this reason, a constant-pressure sampling 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 constant-pressure sampling device for an FTA analyzer includes a sampling probe. The output end of the sampling probe is connected to the input end of an integrated high-temperature electric tracing pipe cable. The output end of the integrated high-temperature electric tracing pipe cable is connected to the input end of a stop valve through a pipeline. The output end of the stop valve is connected to the input end of a bypass filter through a pipeline. The first output end of the bypass filter is connected to the input end of a sampling pressure reducing valve through a pipeline. The output end of the sampling pressure reducing valve is connected to the input end of a sampling needle valve through a pipeline. The output end of the sampling needle valve is connected to the input end of a sampling pneumatic valve through a pipeline. The output end of the sampling pneumatic valve is connected to the sample input end of the FTA analyzer through a pipeline.

[0007] The following is a further limited technical solution of the utility model. It also includes a pretreatment insulation box, in which a box body heater is installed. The stop valve, bypass filter, sampling pressure reducing valve, sampling needle valve, sampling pneumatic valve, and FTA analyzer are all installed in the pretreatment insulation box. The sampling probe and the integrated high-temperature electric tracing pipe cable are both outside the pretreatment insulation box.

[0008] The following are the further defined technical solutions of the present utility model. A sample injection pressure transmitter is installed on the pipeline between the sample injection pneumatic valve and the FTA analyzer. The sample injection pressure transmitter is electrically connected to the PID control unit. The PID control unit is electrically connected to the I / P controller. The air outlet of the I / P controller is connected to the pneumatic control end of the sample injection pneumatic valve through a pipeline. The sample injection pressure transmitter, the PID control unit, and the I / P controller are all installed in the pretreatment insulation box.

[0009] The following are the further defined technical solutions of the present utility model. The air inlet pipeline of the I / P controller is connected to the output end of the instrument air pressure reducing valve. The input end of the instrument air pressure reducing valve is connected to the instrument air main pipe. The instrument air pressure reducing valve is installed in the pretreatment insulation box, and the instrument air main pipe is located outside the pretreatment insulation box.

[0010] The following are the further defined technical solutions of the present utility model. The sample output end of the FTA analyzer is connected to the PP return pipe through a pipeline. The second output end of the bypass filter is connected to the input end of the bypass flowmeter through a pipeline. The output end of the bypass flowmeter is connected to the PP return pipe. The PP return pipe and the bypass flowmeter are both installed in the pretreatment insulation box.

[0011] Compared with the prior art, the present utility model has the following technical effects:

[0012] Through the design of the connection relationships among the various structures of the pretreatment pressure stabilization system (i.e., stop valve, bypass filter, sample injection pressure reducing valve, sample injection needle valve, sample injection pneumatic valve, sample injection pressure transmitter, bypass flowmeter, instrument air pressure reducing valve, I / P controller, PID control unit, cabinet heater, pretreatment insulation box) of the present utility model, stable sampling can be achieved even under the condition of pipeline pressure fluctuations, and the measurement accuracy of real-time monitoring of chemical tail gas is improved.

[0013] The present utility model will be further described below in conjunction with the drawings and embodiments. Description of the Drawings

[0014] 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 described below 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.

[0015] Figure 1 It is a simplified connection relationship diagram of the structure of the present utility model.

[0016] Reference numerals: 1, sampling probe; 2, high-temperature electric tracing integrated cable; 3, globe valve; 4, bypass filter; 5, sample inlet pressure reducing valve; 6, sample inlet needle valve; 7, sample inlet pneumatic valve; 8, sample inlet pressure transmitter; 9, bypass flowmeter; 10, instrument air pressure reducing valve; 11, I / P controller; 12, PID control unit; 13, FTA analyzer; 14, cabinet heater; 15, pretreatment incubator. Detailed implementation manners

[0017] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be given in conjunction with 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.

[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0019] In the embodiments of the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", etc. 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, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. 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.

[0020] As Figure 1 shown, this embodiment provides a constant-pressure sample injection device for an FTA analyzer, which mainly consists of a sampling probe 1, a high-temperature electric tracing integrated cable 2, a globe valve 3, a bypass filter 4, a sample inlet pressure reducing valve 5, a sample inlet needle valve 6, a sample inlet pneumatic valve 7, a sample inlet pressure transmitter 8, a bypass flowmeter 9, an instrument air pressure reducing valve 10, an I / P controller 11, a PID control unit 12, an FTA analyzer 13, a cabinet heater 14, a pretreatment incubator 15, etc.

[0021] Sampling system: sampling probe 1, high-temperature electric tracing integrated cable 2. The sampling system is located outside the pretreatment incubator 15.

[0022] Pretreatment voltage stabilizing system: globe valve 3, bypass filter 4, sample inlet pressure reducing valve 5, sample inlet needle valve 6, sample inlet pneumatic valve 7, sample inlet pressure transmitter 8, bypass flowmeter 9, instrument air pressure reducing valve 10, I / P controller 11, PID control unit 12, cabinet heater 14. The pretreatment voltage stabilizing system is inside the pretreatment insulation box 15.

[0023] Instrument detection system: FTA analyzer 13.

[0024] Working process: The sampling probe 1 inserts into the process pipeline to a depth of 1 / 3 of the inner diameter to take a representative sample (chemical tail gas). The sample then flows through the high-temperature electric tracing integrated cable 2 and then reaches the globe valve 3, bypass filter 4, sample inlet pressure reducing valve 5, sample inlet needle valve 6, sample inlet pneumatic valve 7, and sample inlet pressure transmitter 8 of the pretreatment voltage stabilizing system, and arrives at the FTA analyzer 13 for quantitative and qualitative analysis of the sample.

[0025] In the above working process, the sample air pressure is determined by the saturated vapor pressure corresponding to the highest temperature that the electric tracing belt in the high-temperature electric tracing integrated cable 2 can reach when its surface temperature complies with the regulations. After the sample enters the pretreatment insulation box 15, the cabinet heater 14 will maintain the temperature of the entire pretreatment and keep the entire pretreatment sample in a gaseous state. The sample passes through the globe valve 3 to the bypass filter 4, and the filter accuracy of the paper filter element inside the filter is 0.01um, which absorbs the free moisture of the sample; when the high-pressure sample reaches the sample inlet pressure reducing valve 5, the pressure control set value will be set at 50Kpag; the sample inlet needle valve 6 will limit the sample flow rate to the maximum sample injection volume acceptable to the instrument, which is 150L / H; the sample inlet pneumatic valve 7 will be adjusted by the I / P controller 11 according to the change in the pressure of the sample inlet pressure transmitter 8. When the pressure is high, the valve opening becomes smaller, and when the pressure is low, the valve opening becomes larger. The I / P controller 11 is precisely controlled by the PID control unit 12 by receiving the pressure data of the sample inlet pressure transmitter 8 through three parameters: proportional, integral, and differential, so as to control the sample flow rate and pressure at a stable value, making the measurement of the instrument more stable and accurate. 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 arts, and are only used for those skilled in the art to understand the working process of this embodiment.

[0026] A fast loop is formed by the bypass filter 4 and the bypass flowmeter 9 to reduce the response time of sample transmission. The instrument air pressure reducing valve 10 is matched with the I / P controller 11, so that the I / P controller 11 has a stable intake air pressure and can ensure the purity of the instrument air.

[0027] The FTA analyzer 13 is equipped with an ejector in its internal structure. This ejector uses instrument air as its power source, and its main function is to be able to extract samples and introduce the samples into the instrument analysis system for analysis. After completing the analysis of the samples, the ejector will also eject the analyzed samples and send them back to the original process through the PP return pipe. In this way, no gas will diffuse into the environment, thus avoiding the problem of environmental pollution. Compared with other types of analyzers, such as FID analyzers, etc., which need to discharge the samples into the atmosphere after completing the measurement of the samples, the design of the FTA analyzer 13 is obviously more environmentally friendly and more friendly to the development of on-site environmental protection work. It should be noted that the structure of the FTA analyzer 13 itself is not within the protection scope of the present utility model, and the FTA analyzer 13 is prior art and is only used for the understanding of the application of the FTA analyzer 13 by those skilled in the art.

[0028] The above are only the preferred embodiments of the present utility model and do not impose any formal limitations 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, or modify it into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of the present utility model without departing from the content of the technical solution of the present utility model shall be covered by the protection scope of the present utility model.

Claims

1. A constant voltage sample injection device for an FTA analyzer, characterized in that, It includes a sampling probe (1). The output end of the sampling probe (1) is connected to the input end of a high-temperature electric tracing integrated cable (2). The output end of the high-temperature electric tracing integrated cable (2) is connected to the input end of a stop valve (3) through a pipeline. The output end of the stop valve (3) is connected to the input end of a bypass filter (4) through a pipeline. The first output end of the bypass filter (4) is connected to the input end of a sample pressure reducing valve (5) through a pipeline. The output end of the sample pressure reducing valve (5) is connected to the input end of a sample needle valve (6) through a pipeline. The output end of the sample needle valve (6) is connected to the input end of a sample pneumatic valve (7) through a pipeline. The output end of the sample pneumatic valve (7) is connected to the sample input end of an FTA analyzer (13) through a pipeline.

2. The constant-pressure sample injection device of an FTA analyzer according to claim 1, characterized in that, It further includes a pretreatment incubator (15). A box heater (14) is installed inside the pretreatment incubator (15). The stop valve (3), the bypass filter (4), the sample pressure reducing valve (5), the sample needle valve (6), the sample pneumatic valve (7) and the FTA analyzer (13) are all installed inside the pretreatment incubator (15). The sampling probe (1) and the high-temperature electric tracing integrated cable (2) are both outside the pretreatment incubator (15).

3. The voltage-stabilized sample injection device of an FTA analyzer according to claim 1, characterized in that, A sample pressure transmitter (8) is installed on the pipeline between the sample pneumatic valve (7) and the FTA analyzer (13). The sample pressure transmitter (8) is electrically connected to a PID control unit (12). The PID control unit (12) is electrically connected to an I / P controller (11). The air outlet of the I / P controller (11) is connected to the pneumatic control end of the sample pneumatic valve (7) through a pipeline. The sample pressure transmitter (8), the PID control unit (12) and the I / P controller (11) are all installed inside the pretreatment incubator (15).

4. The constant pressure sample injection device of an FTA analyzer according to claim 3, characterized in that, The air inlet of the I / P controller (11) is connected to the output end of an instrument air pressure reducing valve (10). The input end of the instrument air pressure reducing valve (10) is connected to the instrument air main pipe. The instrument air pressure reducing valve (10) is installed inside the pretreatment incubator (15), and the instrument air main pipe is outside the pretreatment incubator (15).

5. The constant-pressure sample injection device of an FTA analyzer according to claim 1, characterized in that, The sample output end of the FTA analyzer (13) is connected to a PP return pipe. The second output end of the bypass filter (4) is connected to the input end of a bypass flowmeter (9) through a pipeline. The output end of the bypass flowmeter (9) is connected to the PP return pipe. The PP return pipe and the bypass flowmeter (9) are both installed inside the pretreatment incubator (15).

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