Pretreatment device of analyzer for hydrogen production

Abstract

The utility model relates to the technical field of drying equipment, and provides a pretreatment device of an analyzer for hydrogen production, which is arranged at the front end of the analyzer and comprises a gas-liquid separation tank for separating moisture in gas to be analyzed; the drying pipe is connected to the gas outlet of the gas-liquid separation tank and is used for drying the gas to be analyzed; wherein a liquid outlet in the bottom of the gas-liquid separation tank is sequentially connected with a first valve, a water storage tank and a second valve; in the hydrogen production process, the first valve is normally opened, and the second valve is normally closed; when the water storage tank discharges water, the first valve is closed, and the second valve is opened. According to the utility model, the water storage tank is arranged at the liquid outlet at the bottom of the gas-liquid separation tank, so that the gas-liquid separation tank does not store water, online drainage can be carried out in time under the condition that the measurement of an analyzer is not influenced, the problem of shutdown of a hydrogen production device is avoided, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment, in particular to a pretreatment device of an analyzer for hydrogen production. Background Art

[0002] In the production process of polysilicon, the electrolytic hydrogen production device needs to provide sufficient hydrogen for the entire system after the system is started and reduced to ensure the stable operation of cold hydrogenation and reduction. During the operation of the hydrogen production device, the hydrogen in oxygen and hydrogen in oxygen analyzers need to monitor the operation effect of the device in real time. If the oxygen content in hydrogen exceeds the control range, it will cause the hydrogen to explode; if the analyzer has a false alarm due to water ingress and other reasons, it will also stop, causing the entire system to operate at a reduced capacity. Accurate measurement of the analyzer is a crucial factor in ensuring the stable operation of the hydrogen production device.

[0003] At present, the 801 oxygen-hydrogen and hydrogen-oxygen analyzers used in hydrogen production devices have the following problems during operation:

[0004] 1. The gas-liquid separation tank installed in front of the existing analyzer cannot observe whether there is liquid accumulation in the tank. If the liquid level in the tank rises, the liquid will enter the analyzer with the airflow, causing the analyzer to display abnormalities and eventually causing the hydrogen production to stop.

[0005] 2. The drying device installed in front of the existing analyzer cannot be processed online after water enters it. The system can only be shut down to replace the color-changing desiccant and clean up the accumulated water, causing the hydrogen production device to be unable to operate continuously, seriously affecting the overall production load. Each time the color-changing desiccant is replaced and the accumulated water is cleaned up, the hydrogen production device needs to be shut down for 4 hours, affecting the production of hydrogenated liquid, resulting in a reduction of 68.4 tons of trichlorosilane, a loss of approximately 75,000 yuan, and a high maintenance cost. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a pretreatment device for an analyzer for hydrogen production, which can drain the gas-liquid separation tank online and replace the discolored desiccant online without affecting the measurement of the analyzer, thereby avoiding the problem of shutdown of the hydrogen production device and reducing maintenance costs.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A pretreatment device for an analyzer for hydrogen production, arranged at the front end of the analyzer, the pretreatment device comprising:

[0009] A gas-liquid separation tank, used to separate the water in the gas to be analyzed; and

[0010] A drying tube, connected to the gas outlet of the gas-liquid separation tank, for drying the gas to be analyzed;

[0011] Among them, the liquid outlet at the bottom of the gas-liquid separation tank is connected to the first valve, the water storage tank and the second valve in sequence; during the hydrogen production process, the first valve is normally open and the second valve is normally closed; when the water storage tank is drained, the first valve is closed and the second valve is opened.

[0012] In one embodiment disclosed in the present application, a pressure reducing valve is installed at the gas inlet of the gas-liquid separation tank to adjust the pressure of the gas to be analyzed entering the pretreatment device.

[0013] In one embodiment disclosed in the present application, the pressure reducing valve has two pressure gauges, one is arranged at the inlet end of the pressure reducing valve, and the other is arranged at the outlet end of the pressure reducing valve, which are respectively used to display and adjust the inlet pressure and outlet pressure of the pressure reducing valve.

[0014] In one embodiment disclosed in the present application, two drying tubes are arranged in parallel, and the interiors of the drying tubes are filled with a desiccant that changes color after absorbing moisture;

[0015] A first switching valve and a second switching valve are respectively installed on the pipelines of the inlet and outlet of each drying pipe;

[0016] Through the mutual opening and closing between the first switching valve and the second switching valve, the two drying tubes can be switched online to replace the color-changing desiccant.

[0017] In one embodiment disclosed in the present application, the first outlet between the two second switching valves is connected to a vent valve via a first three-way connection.

[0018] In one embodiment disclosed in the present application, the second outlet between the two second switching valves is connected to a flow meter via a second three-way connection;

[0019] The flow meter outlet is communicated with the analyzer inlet and is used to adjust the flow of the gas to be analyzed entering the analyzer.

[0020] In one embodiment disclosed in the present application, the flow meter is a glass tube flow meter.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] 1. By installing a water storage tank at the liquid outlet at the bottom of the gas-liquid separation tank, the gas-liquid separation tank itself does not store water, and can be drained online in time without affecting the measurement of the analyzer, avoiding the problem of hydrogen production device shutdown and reducing maintenance costs.

[0023] 2. By adjusting the pressure reducing valve, the pressure of the gas to be analyzed can meet the requirements, thereby ensuring the safe operation and normal operation of the pretreatment device and analyzer.

[0024] 3. The two drying tubes arranged in parallel are used as backup for each other. When the desiccant in one of the drying tubes changes color, it can be cut out and replaced online without affecting the measurement of the analyzer.

[0025] 4. Open the vent valve to displace and discharge the air that enters the pipeline when replacing the desiccant, preventing abnormal display of the analyzer due to air entering the pipeline.

[0026] 5. By using the flow meter, the flow rate and flow rate of the gas to be analyzed can be accurately controlled to improve the accuracy of the analyzer's measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0029] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0035] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 As shown, the utility model provides a pretreatment device for an analyzer for hydrogen production, which is arranged at the front end of the analyzer (not shown in the figure), and the pretreatment device includes:

[0037] A gas-liquid separation tank 1, used to separate water from the gas to be analyzed; and

[0038] A drying tube 2, connected to the gas outlet of the gas-liquid separation tank 1, for drying the gas to be analyzed;

[0039] Among them, the liquid outlet at the bottom of the gas-liquid separation tank 1 is connected to the first valve 3, the water storage tank 4 and the second valve 5 in sequence; during the hydrogen production process, the first valve 3 is normally open and the second valve 5 is normally closed; when the water storage tank 4 is drained, the first valve 3 is closed and the second valve 5 is opened.

[0040] Specifically, all the above components are connected by pipelines; the analyzer is arranged downstream of the drying tube 2 and is used to measure the oxygen content in the gas to be analyzed. During operation, the gas to be analyzed (hydrogen) is introduced into the gas inlet of the gas-liquid separation tank 1 to achieve gas-liquid separation, and the water flows into the water storage tank 4 from the liquid outlet at the bottom of the gas-liquid separation tank 1. The liquid level in the tank can be observed at any time through the water storage tank 4. When there is a liquid level in the water storage tank 4, the first valve 3 between the gas-liquid separation tank 1 and the water storage tank 4 is closed, and the second valve 5 behind the water storage tank 4 is opened, and the water storage tank 4 is drained online, so as not to affect the measurement of the analyzer. That is to say, by providing the water storage tank 4 at the liquid outlet at the bottom of the gas-liquid separation tank 1, the gas-liquid separation tank 1 itself does not store water, and can be drained online in time without affecting the measurement of the analyzer, thereby avoiding the problem of stopping the hydrogen production device and reducing the maintenance cost.

[0041] The gas inlet of the gas-liquid separation tank 1 is equipped with a pressure reducing valve 6 for adjusting the pressure of the gas to be analyzed entering the pretreatment device. Specifically, the pressure reducing valve 6 has two pressure gauges, one at the inlet end of the pressure reducing valve 6 and the other at the outlet end of the pressure reducing valve 6, which are respectively used to display and adjust the inlet pressure and outlet pressure of the pressure reducing valve 6. By adjusting the pressure reducing valve 6, the pressure of the gas to be analyzed can meet the requirements, thereby ensuring the safe operation and normal operation of the pretreatment device and the analyzer.

[0042] Two drying tubes 2 are arranged in parallel, and the interior of each drying tube 2 is filled with a desiccant that changes color after absorbing moisture; the first switching valve 21A / 21B and the second switching valve 22A / 22B are respectively installed on the inlet and outlet pipelines of each drying tube 2; through the mutual opening and closing between the first switching valve and the second switching valve, the two drying tubes 2 can be switched online to replace the color-changing desiccant. That is, 21A and 22A are opened, 21B and 22B are closed, and the gas to be analyzed enters one drying tube 2 for drying, and the other drying tube 2 replaces the color-changing desiccant online; vice versa. In other words, the two drying tubes 2 arranged in parallel are standby for each other, and the desiccant in one of the drying tubes 2 can be cut out online for replacement after the color changes, so as not to affect the measurement of the analyzer.

[0043] The first outlet between the two second switching valves 22A / 22B is connected to a vent valve 8 through a first three-way valve 7. By opening the vent valve 8, the air entering the pipeline when replacing the desiccant can be replaced and discharged to prevent abnormal display of the analyzer due to air entering the pipeline.

[0044] The second outlet between the two second switching valves 22A / 22B is connected to a flow meter 10 through a second three-way valve 9; the outlet of the flow meter 10 is connected to the inlet of the analyzer, and is used to adjust the flow rate of the gas to be analyzed entering the analyzer. Through the flow meter 10, the flow rate and flow rate of the gas to be analyzed can be accurately controlled, and the accuracy of the measurement results of the analyzer can be improved.

[0045] In this embodiment, the flow meter 10 is a glass tube flow meter.

[0046] In summary, when water accumulation in the water storage tank 4 and discoloration of the desiccant in the drying tube 2 are detected, the pretreatment device can ensure the continuous operation of the hydrogen production device by online drainage and online replacement, thereby avoiding display abnormalities and damage caused by frequent water ingress to the analyzer, and extending the service life of the analyzer to a certain extent.

[0047] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A pretreatment device for an analyzer for hydrogen production, arranged at the front end of the analyzer, characterized in that: The pretreatment device comprises: A gas-liquid separation tank, used to separate the water in the gas to be analyzed; and A drying tube, connected to the gas outlet of the gas-liquid separation tank, for drying the gas to be analyzed; The liquid outlet at the bottom of the gas-liquid separation tank is connected to a first valve, a water storage tank and a second valve in sequence; during the hydrogen production process, the first valve is normally open and the second valve is normally closed; when the water storage tank is drained, the first valve is closed and the second valve is opened; Two drying tubes are arranged in parallel, and the interior of each of them is filled with a desiccant that changes color after absorbing moisture; a first switching valve and a second switching valve are respectively installed on the inlet and outlet pipelines of each drying tube; by opening and closing the first switching valve and the second switching valve, the two drying tubes can be switched online to replace the color-changing desiccant.

2. The pretreatment device of the hydrogen production analyzer according to claim 1, characterized in that: The gas inlet of the gas-liquid separation tank is equipped with a pressure reducing valve for adjusting the pressure of the gas to be analyzed entering the pretreatment device.

3. The pretreatment device of the hydrogen production analyzer according to claim 2, characterized in that: The pressure reducing valve is provided with two pressure gauges, one is arranged at the inlet end of the pressure reducing valve, and the other is arranged at the outlet end of the pressure reducing valve, which are respectively used to display and adjust the inlet pressure and outlet pressure of the pressure reducing valve.

4. The pretreatment device of the hydrogen production analyzer according to any one of claims 1 to 3, characterized in that: The first outlet between the two second switching valves is connected to a vent valve via a first three-way connection.

5. The pretreatment device of the hydrogen production analyzer according to claim 4, characterized in that: The second outlet between the two second switching valves is connected to a flow meter via a second three-way connection; The flow meter outlet is communicated with the analyzer inlet and is used to adjust the flow of the gas to be analyzed entering the analyzer.

6. The pretreatment device of the hydrogen production analyzer according to claim 5, characterized in that: The flow meter is a glass tube flow meter.

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