Gas sample pretreatment device and analyzer with same

Abstract

The utility model relates to a gas sample pretreatment device and an analyzer with the same. The gas sample pretreatment device comprises a pressure reducing valve, a filter and a cooler which are sequentially connected along the flowing direction of gas, gas can be discharged after passing through the pressure reducing valve, the filter and the cooler in sequence; an inflow port of the drainage pipeline is connected to a pipeline between the pressure reducing valve and the filter, and a pressure regulating valve is arranged on the drainage pipeline; by adjusting the opening degree of the pressure regulating valve, a pressure difference is formed between an outlet of the pressure regulating valve and an outlet of the pressure reducing valve, so that gas is introduced into a pipeline where the filter is located. The drainage pipeline is arranged, the pressure regulating valve on the drainage pipeline is opened to enable the drainage pipeline to be in a continuous release state, natural gas subjected to pressure reduction through the pressure regulating valve drives part of the natural gas to flow in the process of flowing towards the drainage pipeline, the natural gas stably flows in the main pipeline, and therefore it is guaranteed that the natural gas stably flows towards the filter and the cooler.

Description

Technical Field

[0001] The utility model relates to the technical field of sample treatment of sulfur analyzers, and particularly to a gas sample pretreatment device and an analyzer having the same. Background Art

[0002] During the process of natural gas collection, in order to ensure that the desulfurized and purified natural gas meets the qualified requirements, it is necessary to analyze the sulfur content in the natural gas sample. Therefore, a sulfur analyzer is usually installed at the outlet of the desulfurization device to detect and analyze the sample.

[0003] Since the natural gas after the desulfurization process has a high temperature and carries water vapor, and the water vapor in the natural gas will condense into liquid during transportation due to temperature and pressure changes, and the liquid entering the sulfur analyzer will affect the detection result. Therefore, it is necessary to set a gas sample pretreatment device upstream of the sulfur analyzer to pretreat the natural gas sample.

[0004] Although the Chinese patent (authorization publication number: CN213482238U) discloses an on-line sulfur and nitrogen analyzer sample pretreatment and sampling and quantification device, which sequentially sets a pressure reducer, a filter, a cooler and a quantification module, but since the upstream pressure reducer reduces the pressure of the sample, it may cause the problem of unstable flow rate during the flow of the depressurized sample to the downstream filter. Summary of the Utility Model

[0005] The utility model provides a gas sample pretreatment device and an analyzer having the same, which are used to solve the problem of unstable flow rate during the flow of the gas sample to the downstream after the upstream pressure reducer in the gas sample pretreatment device reduces the pressure of the gas sample in the prior art.

[0006] On the one hand, the utility model provides a gas sample pretreatment device, which includes a pressure reducer, a filter and a cooler connected in sequence along the flow direction of the gas; the gas can be discharged after passing through the pressure reducer, the filter and the cooler in sequence; it further includes:

[0007] A diversion pipeline, the inlet of the diversion pipeline is connected to the pipeline between the pressure reducer and the filter, and a pressure regulating valve is arranged on the diversion pipeline; by adjusting the opening degree of the pressure regulating valve, a pressure difference is formed between the outlet of the pressure regulating valve and the outlet of the pressure reducer, so as to introduce the gas into the pipeline where the filter is located.

[0008] Further, the filter has an inlet, an outlet and a first sewage discharge port; wherein, the inlet of the filter is communicated with the gas transmission pipeline segment through a first gas transmission pipeline, and the pressure reducer is arranged on the first gas transmission pipeline;

[0009] The outlet of the filter is connected to the cooler and is adapted to discharge the filtered gas into the cooler; the first drain port is used to discharge the liquid water in the gas.

[0010] Optionally, the cooler includes a cooling pipe and a refrigerator. The cooling pipe has an inlet connected to the outlet of the filter, an outlet for discharging the cooled gas, and a second drain port for discharging the condensed water.

[0011] Preferably, the gas sample pretreatment device further includes:

[0012] A peristaltic pump. The inlet of the peristaltic pump is communicated with the outlet of the second drain port. The peristaltic pump is used to drive the condensed water in the cooling pipe to be discharged from the cooling pipe.

[0013] Optionally, the outlet of the cooling pipe is connected to an analyzer.

[0014] Optionally, the gas sample pretreatment device further includes:

[0015] A check valve, which is arranged on the second gas pipeline between the filter and the cooler.

[0016] Optionally, the gas sample pretreatment device further includes:

[0017] A pressure relief pipeline. The inlet of the pressure relief pipeline is connected to the pipeline between the pressure reducing valve and the filter. A safety pressure relief valve is arranged on the pressure relief pipeline.

[0018] On the other hand, the present invention also provides an analyzer, which includes the gas sample pretreatment device in the above embodiment.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] 1. In the present invention, the pipeline through which the natural gas can flow through the filter and the cooler is the main pipeline. By setting a diversion pipeline on the bypass of the main pipeline and opening the pressure regulating valve on the diversion pipeline so that the diversion pipeline is in a continuous discharge state, the opening degree of the pressure regulating valve is adjusted according to the flow rate and pressure requirements on the main pipeline to adjust the gas flow rate and pressure on the diversion pipeline, so that a pressure difference is formed between the outlet of the pressure regulating valve and the outlet of the pressure reducing valve. During the flow of the natural gas decompressed by the pressure regulating valve towards the diversion pipeline, part of the natural gas will be driven to flow stably in the main pipeline to ensure that the natural gas flows stably towards the filter and the cooler.

[0021] The pressure reducing valve is used to reduce the pressure of the natural gas in the pipeline; the filter is used to remove the liquid water carried in the natural gas and reduce the moisture content in the natural gas sample; the cooler is used to cool the filtered natural gas to condense the water vapor in the natural gas at a low temperature and further reduce the moisture content in the natural gas sample.

[0022] 2. The working principle of the filter is as follows: The natural gas to be filtered enters the filter through the inlet of the filter for filtration. The filtered natural gas can flow out through the outlet of the filter and flow to the cooler; while the liquid water filtered out is discharged through the first drain port on the filter.

[0023] 3. The working principle of the cooler is as follows: The natural gas to be cooled enters the cooling pipe through the inlet of the cooling pipe. Under the heat exchange and refrigeration effect of the cooler, the water vapor in the natural gas condenses when it meets the cold, and the condensed water is discharged through the second drain port. The natural gas with the water vapor filtered out is discharged through the outlet of the cooling pipe.

[0024] 4. The peristaltic pump is used to drive the condensed water in the cooling pipe to be discharged from the cooling pipe, so as to assist in discharging the condensed water in the cooling pipe.

[0025] 5. In the present utility model, a pressure relief pipeline is provided. The pressure reducing valve can reduce the pressure of the natural gas. However, when a failure or other situations occur to the pressure reducing valve, the gas pressure at the outlet of the pressure reducing valve exceeds the preset pressure condition. At this time, the safety pressure relief valve needs to be opened to discharge the overpressure natural gas to ensure that the natural gas entering the filter meets the preset pressure, so as to protect the gas sample pretreatment device and the analyzer.

[0026] 6. The function of the check valve in the present utility model is to prevent the reverse flow of gas between the filter and the cooler. Especially when the safety pressure relief valve is opened for pressure relief, the natural gas in the pipeline is prone to reverse flow. By setting the check valve, the reverse flow of gas can be effectively avoided. Description of the Drawings

[0027] In the following, the present utility model will be described in more detail based on the embodiments with reference to the drawings.

[0028] Figure 1 It is a schematic structural diagram of the gas sample pretreatment device.

[0029] Reference Signs:

[0030] 100, gas transmission pipe section; 200, sulfur analyzer;

[0031] 1, pressure reducing valve; 2, filter;

[0032] 3, cooler; 31, cooling pipe; 32, refrigerator;

[0033] 4, drainage pipeline; 41, pressure regulating valve;

[0034] 51, first drain valve; 52, second drain valve;

[0035] 6, peristaltic pump;

[0036] 7, pressure relief pipeline; 71, safety pressure relief valve; 8, check valve. Detailed implementation mode

[0037] The present utility model will be further described below in conjunction with the accompanying drawings.

[0038] It should be noted that the arrow direction in the figure is the gas flow direction.

[0039] On the one hand, the present utility model provides a gas sample pretreatment device, which includes a pressure reducing valve 1, a filter 2, a cooler 3 and a diversion pipeline 4.

[0040] Specifically, along the gas flow direction, the pressure reducing valve 1, the filter 2 and the cooler 3 are sequentially connected in series, and the gas can be discharged after passing through the pressure reducing valve 1, the filter 2 and the cooler 3 in sequence. The pressure reducing valve 1 is used to reduce the pressure of natural gas in the pipeline; the filter 2 is used to remove the liquid water carried in the natural gas and reduce the moisture content in the natural gas sample; the cooler 3 is used to cool the filtered natural gas to condense the water vapor in the natural gas at a low temperature, further reducing the moisture content in the natural gas sample, thereby improving the detection accuracy of the analyzer.

[0041] The inlet of the diversion pipeline 4 is connected to the pipeline between the pressure reducing valve 1 and the filter 2, and a pressure regulating valve 41 is provided on the diversion pipeline 4; by adjusting the opening of the pressure regulating valve 41, a pressure difference is formed between the outlet of the pressure regulating valve 41 and the outlet of the pressure reducing valve 1 to introduce the gas into the pipeline where the filter 2 is located.

[0042] In the embodiment of the present utility model, the pipeline through which natural gas can flow through the filter 2 and the cooler 3 is the main pipeline. By setting a diversion pipeline 4 on the bypass of the main pipeline, opening the pressure regulating valve 41 on the diversion pipeline 4 to make the diversion pipeline 4 in a continuous discharge state, and adjusting the opening of the pressure regulating valve 41 according to the flow rate and pressure requirements on the main pipeline to adjust the gas flow rate and pressure on the diversion pipeline 4, so that a pressure difference is formed between the outlet of the pressure regulating valve 41 and the outlet of the pressure reducing valve 1. During the flow of the natural gas decompressed by the pressure regulating valve 41 towards the diversion pipeline 4, it will drive part of the natural gas to flow and stably flow in the main pipeline to ensure that the natural gas stably flows towards the filter 2 and the cooler 3.

[0043] The filter 2 has an inlet, an outlet and a first sewage discharge port; among them, the inlet of the filter 2 is communicated with the gas transmission pipeline segment 100 through a first gas transmission pipeline, and the pressure reducing valve 1 is arranged on the first gas transmission pipeline; the outlet of the filter 2 is connected to the cooler 3, and the first sewage discharge port is used to discharge the liquid water in the gas. A first sewage discharge valve 51 for controlling the opening and closing of the first sewage discharge port is arranged at the first sewage discharge port.

[0044] The working principle of the filter 2 is as follows: The natural gas to be filtered enters the filter 2 through the inlet of the filter 2 for filtration. The filtered natural gas can flow out through the outlet of the filter 2 and flow to the cooler 3; while the filtered liquid water is discharged from the first drain port on the filter 2.

[0045] The cooler 3 includes a cooling pipe 31 and a refrigerator 32. The refrigerator 32 is used to cool the cooling pipe 31. The cooling pipe 31 has an inlet connected to the outlet of the filter 2, an outlet for discharging the cooled gas, and a second drain port for discharging the condensed water. A second drain valve 52 for controlling the opening and closing of the second drain port is provided at the second drain port. Preferably, the cooling pipe 31 is a coiled pipe, which can increase the flow path of the natural gas and the cooling area, thereby improving the refrigeration efficiency of the cooler 3. Preferably, the gas sample pretreatment device further includes a peristaltic pump 6. The inlet of the peristaltic pump 6 is communicated with the outlet of the second drain port. The peristaltic pump 6 is used to drive the condensed water in the cooling pipe 31 to be discharged from the cooling pipe 31, thereby assisting in discharging the condensed water in the cooling pipe 31. Optionally, the outlet of the cooling pipe 31 is connected to an analyzer, and the analyzer can be a sulfur analyzer 200. The sulfur analyzer 200 can measure and analyze the sulfur content in the pretreated natural gas sample.

[0046] The working principle of the cooler 3 is as follows: The natural gas to be cooled enters the cooling pipe 31 through the inlet of the cooling pipe 31. Under the heat exchange and refrigeration action of the cooler 3, the water vapor in the natural gas is condensed when it meets the cold, and the condensed water is discharged through the second drain port. The natural gas from which the water vapor is filtered is discharged from the outlet of the cooling pipe 31.

[0047] Optionally, the gas sample pretreatment device further includes a pressure relief pipeline 7. The inlet of the pressure relief pipeline 7 is connected to the pipeline between the pressure reducing valve 1 and the filter 2. A safety pressure relief valve 71 is provided on the pressure relief pipeline 7. The pressure reducing valve 1 can reduce the pressure of the natural gas. However, when the pressure reducing valve 1 fails or other situations occur, the gas pressure at the outlet of the pressure reducing valve 1 exceeds the preset pressure condition. At this time, the safety pressure relief valve 71 needs to be opened to release the overpressure natural gas to ensure that the natural gas entering the filter 2 meets the preset pressure, thereby protecting the gas sample pretreatment device and the analyzer.

[0048] Preferably, the gas sample pretreatment device further includes a check valve 8, which is arranged on the second gas pipeline between the filter 2 and the cooler 3. The function of the check valve 8 is to prevent the gas between the filter 2 and the cooler 3 from flowing back. Especially when the safety pressure relief valve 71 is opened for pressure relief, the natural gas in the pipeline is prone to flow back. By setting the check valve 8, the gas flow back can be effectively avoided.

[0049] On the other hand, the present invention also provides an analyzer, which includes the gas sample pretreatment device in the above embodiment.

[0050] Although the present utility model has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A gas sample pretreatment device, characterized in that, It includes a pressure reducing valve, a filter, and a cooler that are sequentially connected in the gas flow direction; the gas can be discharged after passing through the pressure reducing valve, the filter, and the cooler in sequence; it further includes: A drainage pipeline, the inlet of the drainage pipeline is connected to the pipeline between the pressure reducing valve and the filter, and a pressure regulating valve is provided on the drainage pipeline; by adjusting the opening degree of the pressure regulating valve, a pressure difference is formed between the outlet of the pressure regulating valve and the outlet of the pressure reducing valve to introduce the gas into the pipeline where the filter is located.

2. The gas sample pretreatment device according to claim 1, characterized in that, The filter has an inlet, an outlet, and a first sewage discharge port; wherein, the inlet of the filter is communicated with the gas pipeline segment through a first gas pipeline, and the pressure reducing valve is arranged on the first gas pipeline; The outlet of the filter is connected to the cooler and is adapted to discharge the filtered gas into the cooler; the first sewage discharge port is used to discharge the liquid water in the gas.

3. The gas sample pretreatment device according to claim 1, characterized in that The cooler includes a cooling pipe and a refrigerator, and the cooling pipe has an inlet connected to the outlet of the filter, an outlet for discharging the cooled gas, and a second sewage discharge port for discharging the condensed water.

4. The gas sample pretreatment device according to claim 3, characterized in that, It further includes: A peristaltic pump, the inlet of the peristaltic pump is communicated with the outlet of the second sewage discharge port, and the peristaltic pump is used to drive the condensed water in the cooling pipe to be discharged from the cooling pipe.

5. The gas sample pretreatment device according to claim 3 or 4, characterized in that, The outlet of the cooling pipe is connected to an analyzer.

6. The gas sample pretreatment device according to claim 1, wherein It further includes: A check valve, which is arranged on the second gas pipeline between the filter and the cooler.

7. The gas sample pretreatment device according to claim 1, characterized in that, It further includes: A pressure relief pipeline, the inlet of the pressure relief pipeline is connected to the pipeline between the pressure reducing valve and the filter, and a safety pressure relief valve is provided on the pressure relief pipeline.

8. An analyzer, characterized in that, It includes the gas sample pretreatment device according to any one of claims 1-7.

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