Gas-liquid component analysis pretreatment system

Abstract

The utility model discloses a gas-liquid component analysis pretreatment system, which is used for on-line component analysis of chemical waste gas or waste liquid, and comprises a sampling device, a temperature control unit and a pressure monitoring unit, the temperature control unit is used for cooling or preserving heat of a medium to be analyzed through circulating cooling liquid, and the pressure monitoring unit is used for monitoring the temperature of the medium to be analyzed. A to-be-analyzed medium output by the temperature control unit is conveyed into the screw-in filter through the pressure pump, and is finally conveyed into chemical analysis equipment including a chromatographic instrument for component analysis; a pressure transmitter is arranged on an output pipeline of the pressure pump and used for converting monitored pressure into an electric signal and feeding the electric signal back to the pressure pump, and then automatic starting and stopping of the pressure pump are controlled. The device can be suitable for chemical component analysis of to-be-analyzed media such as gas or liquid.

Description

Technical Field

[0001] This utility model pertains to chemical analysis devices, specifically relating to a pretreatment system for gas-liquid component analysis. Background Technology

[0002] In industrial production instrument analysis, the sample pretreatment system is the prerequisite and guarantee for the normal operation of the online analysis system. For continuous and accurate online sample analysis, the pretreatment system must provide safe, reliable, stable, and effective samples. The pretreatment results not only affect the measurement accuracy and results of the instruments but can also damage the instruments and even cause production process accidents. Currently, pretreatment systems have limited functionality and unstable operating conditions. This invention can perform cooling, filtration, dust removal, and voltage stabilization on samples, handling samples in different states to meet the sample analysis needs of online instruments. Utility Model Content

[0003] The purpose of this invention is to provide a gas-liquid component analysis pretreatment system that is applicable to the pretreatment of the media to be analyzed, including gaseous or liquid media, and includes pretreatment processes such as cooling, heat preservation, filtration, dust removal, and pressure stabilization.

[0004] Technical solution: A gas-liquid component analysis pretreatment system, which is used for online component analysis of chemical waste gas or waste liquid, including a sampling device, a temperature control unit and a pressure monitoring unit. The temperature control unit cools or keeps the medium to be analyzed by circulating coolant. The medium to be analyzed output by the temperature control unit is transported to a swirl filter by a pressure pump and finally transmitted to chemical analysis equipment including a chromatograph for component analysis.

[0005] A pressure transmitter is installed on the output pipeline of the pressure pump. The pressure transmitter is used to convert the monitored pressure into an electrical signal and feed it back to the pressure pump, thereby controlling the automatic start and stop of the pressure pump.

[0006] Furthermore, the pressure pump includes two or more units connected in parallel to regulate pressure based on the pressure value monitored by the pressure transmitter.

[0007] Furthermore, the pressure pump includes a straight-through pipeline connected in parallel, and the on / off state of the straight-through pipeline is controlled by a solenoid valve.

[0008] Furthermore, for two or more pressure pumps, at least one of them may be configured for gas or liquid return.

[0009] Furthermore, the temperature control unit includes a tubular cooling tank, and the coolant circulating in the tubular cooling tank includes a heating device to heat the coolant or a cooling device to cool the coolant.

[0010] Furthermore, the system includes setting up two sampling paths, with one of them configured as a loop, including transporting the residual gas discharged from the pressure pump output and / or the swirl filter back to the chemical waste gas / waste liquid discharge pipeline.

[0011] Furthermore, the pipeline in which the inlet filter delivers the medium to be analyzed to the chemical analysis equipment includes a calibration unit connected to it, the calibration unit including those for gas calibration or liquid calibration.

[0012] Furthermore, the system includes several flow meters or pressure gauges installed on the pipeline for transmitting the medium to be analyzed to monitor the flow or pressure, and also includes a temperature sensor to detect the temperature of the medium to be analyzed.

[0013] Furthermore, the system includes a thermally insulated environment, including an insulated box or an insulation layer on the pipeline.

[0014] Furthermore, the system includes a nitrogen backflushing unit connected to the output pipeline of the pressure pump.

[0015] Beneficial effects: This invention includes a tubular water-cooled tank, which can effectively regulate sample temperature by introducing cold water for cooling or hot water for sample insulation. The system also includes a pressure pump controlled by a pressure transmitter, suitable for both low and high sample pressures. For gaseous or liquid analytes, this invention employs a multi-stage filtration system, including pipeline filters, swirl filters, and two-way filters, to purify the sample and protect the instruments. Attached Figure Description

[0016] Figure 1 This is a structural diagram of one embodiment of the system described in this utility model. Detailed Implementation

[0017] This invention provides a gas-liquid component analysis pretreatment system, which is applied to the front end of instrument analysis and measurement in industrial production processes such as fertilizer, chemical, metallurgy, power, environmental protection, hydrogen production, and oxygen production. This analytical device can effectively change or remove obstructive and interfering components in the sample, providing the instrument with a stable sample that meets the measurement requirements, making the process parameters measured by the instrument more reliable, and providing a strong guarantee for the safe operation of the analytical instrument.

[0018] A gas-liquid component analysis pretreatment system, combined with Figure 1 The system, as shown in the diagram, includes:

[0019] Sampling unit 1 takes samples from chemical waste gas flare or waste liquid pipeline through sampling probe, and transports the collected medium to be analyzed to temperature control unit through sampling root ball valve 101 and connecting flange 102.

[0020] The temperature control unit is connected to the sampling unit via a pipe flange 2, including a control valve at the connection point. This control valve can be a three-piece ball valve PB01. The medium to be analyzed then enters the tubular cooling tank 3. The tubular cooling tank 3 uses circulating coolant to keep or cool the medium to be analyzed. The medium to be analyzed after passing through the tubular cooling tank 3 is further transported to the pretreatment tank through the pipeline of the pressure pump 4. The pretreatment tank uses a swirl filter for filtration. At the output end of the pressure pump 4, a pressure transmitter 5 is installed. The pressure transmitter 5 converts the monitored pressure data into an electrical signal and feeds it back to the pressure pump 4, thereby controlling the start and stop of the pressure pump 4.

[0021] Specifically, the three-piece ball valves (PB01, PB03, PB04) are opened, and the liquid sample enters the tubular cooling tank 3 for processing (the tubular cooling tank 3 is composed of tubular components, which can effectively cool the sample; when the sample temperature is too high, the ball valve PB08 and needle valve NV01 of the cooling pipe are opened, and the eccentric impeller water flow indicator ISG01 can monitor the presence of cooling water in real time, and cooling water enters for cooling; when the sample temperature is at room temperature, the cooling water is turned off). After passing through the Y-type filter ST01 for the first filtration to remove impurities and solid particles, the sample then passes through the three-piece ball valve PB03 and either the pressure pump 4 or the needle valve NV01 to reach the pressure transmitter 5 (the pressure transmitter 5 is used to monitor the sample pressure; when the sample pressure is too low, the pressure pump 4 is turned on to transport the sample backward; when the sample pressure is too high, the pressure pump 4 stops working, and the sample is transported backward through the control path of the needle valve NV01). At this point, the sample is divided into two paths. One path returns to the pipeline via a needle valve, and the other path goes to the pretreatment tank (the return pipeline is a large pipe, and the inlet pretreatment pipeline is a small pipe; the different sizes allow for flow separation). After passing through a ball valve to a pressure gauge (pressure monitoring), and then a thermometer (temperature monitoring), the sample reaches the swirl filter SF (under the action of the swirl filter, the sample will undergo a second filtration, removing impurities through rotational sedimentation). Then, within the swirl filter, it is divided into two paths. One path goes to a needle valve flow meter and a check valve (to prevent liquid backflow). After pressure detection, it goes to the pipeline via a ball valve. The other path, the clean sample, passes through the "Work-Calibration" switching valve set to "Work" and the pipeline filter (a third filtration to protect the analytical instruments) to reach the analytical device for analysis. Then, it exits through a needle valve flow meter (to adjust the sample flow rate) and a check valve (to prevent liquid backflow) and is discharged, forming a closed loop.

[0022] When the system described in this utility model needs to be purged, nitrogen gas is split into two paths through the air filter pressure reducing valve and then purged through the pipeline via ball valve BV03 and one-way valve CV01. When the system needs to be calibrated, the "Work-Calibration" switching valve BXV01 is set to "Calibration" to complete the calibration flow path switching.

Claims

1. A gas-liquid component analysis pretreatment system, used for online component analysis of chemical waste gas or waste liquid, comprising a sampling device, a temperature control unit, and a pressure monitoring unit, characterized in that, The temperature control unit cools or keeps the medium to be analyzed by circulating coolant. The medium to be analyzed output by the temperature control unit is delivered to the swirl filter by a pressure pump, and finally transmitted to chemical analysis equipment including a chromatograph for component analysis. A pressure transmitter is installed on the output pipeline of the pressure pump. The pressure transmitter is used to convert the monitored pressure into an electrical signal and feed it back to the pressure pump, thereby controlling the automatic start and stop of the pressure pump.

2. The gas-liquid component analysis pretreatment system according to claim 1, characterized in that, The pressure pump includes two or more units connected in parallel to regulate pressure based on the pressure value monitored by the pressure transmitter.

3. The gas-liquid component analysis pretreatment system according to claim 1 or 2, characterized in that, The pressure pump includes a straight-through pipeline connected in parallel, and the on / off state of the straight-through pipeline is controlled by a solenoid valve.

4. The gas-liquid component analysis pretreatment system according to claim 2, characterized in that, For two or more pressure pumps, including at least one of them being configured for gas or liquid return.

5. The gas-liquid component analysis pretreatment system according to claim 1, characterized in that, The temperature control unit includes a tubular cooling tank, and the coolant circulating in the tubular cooling tank includes a heating device to heat the coolant or a cooling device to cool the coolant.

6. The gas-liquid component analysis pretreatment system according to claim 1, characterized in that, The system includes two sampling paths, one of which is configured as a loop to transport the residual gas discharged from the pressure pump output and / or the swirl filter back to the chemical waste gas / waste liquid discharge pipeline.

7. The gas-liquid component analysis pretreatment system according to claim 1, characterized in that, The spiral filter includes a calibration unit connected to the pipeline that delivers the medium to be analyzed to the chemical analysis equipment. The calibration unit includes functions for gas calibration or liquid calibration.

8. The gas-liquid component analysis pretreatment system according to claim 1, characterized in that, The system includes several flow meters or pressure gauges installed on the pipeline for transmitting the medium to be analyzed to monitor the flow or pressure, and also includes a temperature sensor to detect the temperature of the medium to be analyzed.

9. The gas-liquid component analysis pretreatment system according to claim 1, characterized in that, The system includes a thermally insulated environment, including an insulated box or an insulation layer on the pipeline.

10. The gas-liquid component analysis pretreatment system according to claim 2, characterized in that, The system includes a nitrogen backflushing unit, which is connected to the output pipeline of the pressure pump.

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