Sample gas pretreatment device
By designing a sample gas pretreatment device, the connecting pipes and negative pressure generators of the water washing chamber and the drain chamber are automatically cleaned, which solves the problem of fine dust interference in the online oxygen analyzer and realizes the purity of the analyzer Sample gas supply reduces maintenance costs and workload.
Patent Information
- Application Number
- CN202420618286.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The prior art cannot effectively remove fine dust interference factors in dissolving kettles or waste wire kettles, resulting in the analysis lag of the online oxygen analyzer and the measurement value drift, increasing maintenance costs and workload.
A sample gas pretreatment device is designed, including a water washing chamber and a drain chamber connected by a communication pipe, equipped with a filter layer and a flowmeter, and a negative pressure generator of the filter layer and a drain chamber in the water washing chamber. Automatically clean fine dust in the sample gas to ensure that the analyzer obtains pure and stable sample gas.
It effectively eliminates the problem of zero point drift, extended analysis lag time and sample tube blockage of the analyzer, reduces maintenance workload, is suitable for explosion-proof environments, and has a simple structure, low cost and convenient operation.
Smart Images
Figure CN222144662U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of real-time online analysis, and in particular relates to a sample gas pretreatment device. Background Art
[0002] During the open feeding process of the dissolving kettle or the waste silk kettle, the real-time online monitoring system of the oxygen concentration in the kettle is an important monitoring point to ensure the safety of pulping production. The sample gas extracted from the top of the waste silk kettle in real time carries many interference factors such as acetone gas, dust, flying catkins, air, water mist, etc., among which there is a kind of fine dust with a particle size of less than 5μm. However, the actual working conditions can no longer accept the replacement of filter elements with smaller mesh numbers, because filter elements with smaller mesh numbers are prone to liquid phase blockage, which will further increase the maintenance cost and workload of the analyzer system maintenance. There is no suitable and effective filtering or pretreatment device on the market that can remove the fine dust interference factor. After entering the measuring component of the online oxygen analyzer (such as the paramagnetic oxygen measurement method), the fine dust will be deposited in the sample gas pipe, which will extend the analysis lag time of the analyzer exponentially, and also cause the phenomenon of frequent drift of the measured values of the analyzer, and it is impossible to truly and accurately measure the oxygen concentration in the kettle. In addition, during instrument calibration, even if compressed air is used for continuous purging for 3-4 hours and then high-purity nitrogen standard gas is passed through the analyzer, it is difficult to restore the oxygen content to 0%. Therefore, it is urgent to provide a sample gas pretreatment device that can effectively remove interference factors such as fine dust, so that the analyzer can obtain pure, stable and qualified sample gas. Utility Model Content
[0003] In order to overcome the deficiencies of the prior art, the utility model aims to provide a sample gas pretreatment device that can effectively remove interference factors such as fine dust, so that the analyzer can obtain pure, stable and qualified sample gas.
[0004] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:
[0005] A sample gas pretreatment device comprises an upper water washing chamber and a lower drainage chamber, wherein the water washing chamber is connected to the drainage chamber via a connecting pipe; an air inlet pipe and an air outlet pipe are provided at the top of the water washing chamber, and the air inlet pipe extends to the bottom of the water washing chamber; a filter layer is provided inside the water washing chamber; the water washing chamber is connected to a water inlet pipe; and the drainage chamber is provided with a drainage pipe.
[0006] Compared with the prior art, the beneficial effects of the utility model are as follows: the sample gas pretreatment device is provided with a water washing chamber and a liquid discharge chamber distributed up and down, and the two chambers are connected by a connecting pipe, and the arrangement of the air inlet pipe, the air outlet pipe, the water inlet pipe and the liquid discharge pipe is optimized, so that the sample gas pretreatment device can automatically clean the interference factors such as fine dust particles in the sample gas, so that the analyzer can obtain pure, stable and qualified sample gas. The sample gas pretreatment device can eliminate the problems of zero drift of the analyzer, extended analysis lag time, and sample tube blockage; and the structure design is simple, the cost is low, the operation is convenient, the water washing effect is good, the waste liquid discharge flow rate is adjustable, and modular rapid disassembly and assembly can be realized; in addition, the sample gas pretreatment device has no electric or mechanical moving parts, and the operation is safe, stable and reliable. It can be used for fine dust treatment in areas with gas explosion-proof requirements, and the daily maintenance workload is less.
[0007] In the above-mentioned sample gas pretreatment device, the filter layer is arranged at the bottom of the water washing chamber, and the upper end of the connecting pipe is higher than the filter layer. It can be understood that the upper end of the connecting pipe, i.e., the connecting pipe, is located at one end of the water washing chamber. After the sample gas is washed with water, the waste water in the water washing chamber contains fine dust and acetone liquid, etc., which enters the drainage chamber through the connecting pipe. By controlling the upper end of the connecting pipe to be higher than the filter layer, the sample gas can be fully washed, and the substances in the filter layer can be prevented from entering the drainage chamber through the connecting pipe.
[0008] In the above-mentioned sample gas pretreatment device, the filter layer contains granular quartz sand. Preferably, the particle size of the granular quartz sand is 2-4 mm.
[0009] In the above-mentioned sample gas pretreatment device, the thickness of the filter layer is 1 / 5 to 3 / 5 of the height of the water washing chamber, preferably 3 / 10 to 1 / 2.
[0010] In the above-mentioned sample gas pretreatment device, the drainage pipe includes a portion A located inside the drainage chamber and a portion B located outside the drainage chamber; the height of the portion A is 3 / 10 to 9 / 10 of the height of the drainage chamber, preferably 1 / 2 to 4 / 5. By setting the height of the portion A of the drainage pipe, the wastewater flowing into the drainage chamber can be stored and diluted for a second time, and the water level of the wastewater can also be used to balance the upper and lower chambers.
[0011] The sample gas pretreatment device is provided with a gas negative pressure generator on the drainage pipe outside the drainage chamber, which can generate negative pressure to draw away the waste liquid in the drainage chamber.
[0012] In the above-mentioned sample gas pretreatment device, flow meters are respectively provided on the gas outlet pipe and the water inlet pipe to ensure that the inlet and outlet flow rates are adjustable.
[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 A schematic structural diagram of a sample gas pretreatment device provided in an embodiment of the utility model.
[0015] Description of Figure Numbers:
[0016] A water washing chamber 100, an air inlet pipe 110, an air outlet pipe 120, a water inlet pipe 130, and a filter layer 140;
[0017] Drainage chamber 200, drainage pipe 210, gas negative pressure generator 211, air filter pressure reducing valve 212;
[0018] A connecting pipe 300;
[0019] The bracket 400 is fixed. DETAILED DESCRIPTION
[0020] The embodiments of the present invention are described in detail below. Figure 1 An embodiment of the utility model provides a sample gas pretreatment device, including an upper water washing chamber 100 and a lower drainage chamber 200, the water washing chamber 100 and the drainage chamber 200 are connected by a connecting pipe 300; an air inlet pipe 110 and an air outlet pipe 120 are provided at the top of the water washing chamber 100, and the air inlet pipe 110 extends to the bottom of the water washing chamber 100; a filter layer 140 is provided at the bottom of the water washing chamber 100; the water washing chamber 100 is connected to a water inlet pipe 130; and the drainage chamber 200 is provided with a drainage pipe 210.
[0021] Specifically, there is no special restriction on the shapes of the water washing chamber 100 at the top and the drainage chamber 200 at the bottom of the sample gas pretreatment device, such as a cylindrical chamber, a rectangular chamber, etc. However, it is necessary to be able to be stably installed up and down to meet the actual installation conditions. The walls of the water washing chamber 100 and the drainage chamber 200 are preferably made of transparent material to facilitate observation of the internal conditions. For example, in a specific embodiment, the water washing chamber 100 at the top and the drainage chamber 200 at the bottom of the sample gas pretreatment device are respectively composed of two transparent tempered glass cylinders, and the space between the two transparent tempered glass cylinders, as well as the upper part of the first transparent tempered glass cylinder and the lower part of the second transparent tempered glass cylinder are respectively connected to the fixed bracket 400.
[0022] In the actual processing process, clean water enters the water washing chamber 100 through the water inlet pipe 130 at a certain flow rate, and ensures the dynamic liquid level balance of the upper and lower chambers. The sample gas to be measured enters from the bottom of the water washing chamber 100 through the air inlet pipe 110, and is dispersed into tiny bubbles when passing through the filter layer 140. The fine dust contained in the tiny bubbles is cleaned and the acetone liquid is diluted. When the gas reaches the liquid surface, it becomes a pure, stable and qualified sample gas, which can eliminate problems such as analyzer zero drift, extended analysis lag time, and sample tube blockage. In the analyzer calibration check, after the high-purity nitrogen standard gas is introduced, the oxygen concentration measurement value of the online oxygen analyzer can quickly return to zero in only about 1 minute.
[0023] The wastewater washed with the sample gas to be tested is mixed with fine dust and diluted acetone liquid. When the liquid level of the wastewater is higher than the upper end of the connecting pipe 300, the wastewater enters the drainage chamber 200 through the connecting pipe 300, and is stored and diluted again in the drainage chamber 200. When the wastewater in the drainage chamber 200 is discharged from the sample gas pretreatment device through the drainage pipe 210.
[0024] Furthermore, the upper end of the connecting pipe 300 is higher than the filter layer 140. It can be understood that the upper end of the connecting pipe 300, i.e., the connecting pipe 300, is located at one end of the water washing chamber 100. After the sample gas is washed with water, the waste water in the water washing chamber 100 contains fine dust and acetone liquid, etc., and enters the drainage chamber 200 through the connecting pipe 300. By controlling the upper end of the connecting pipe 300 to be higher than the filter layer 140, the sample gas can be fully washed, and the substances in the filter layer 140 can be prevented from entering the drainage chamber 200 through the connecting pipe 300. Specifically, the connecting pipe 300 can select a 1 / 2-inch stainless steel pipe for welding to connect the water washing chamber 100 and the drainage chamber 200.
[0025] Specifically, the filter layer 140 contains granular quartz sand. The particle size of the granular quartz sand is 2-4 mm. When the sample gas to be measured passes through the filter layer 140 filled with quartz sand, it is dispersed into tiny bubbles. The edges and stacking space of the quartz sand are used to hang the fine dust in the sample gas, which plays a role in quickly washing the gas; at the same time, the bubbles in the water washing chamber are used to loosen the quartz sand, which can also achieve the purpose of cleaning the quartz sand, reducing the amount of quartz sand hanging on the wall, and extending the replacement time of the quartz sand.
[0026] Furthermore, the thickness of the filter layer 140 is 1 / 5 to 3 / 5 of the height of the washing chamber 100 , and in some embodiments, can be 3 / 10 to 1 / 2.
[0027] Furthermore, the drainage pipe 210 includes a portion A located inside the drainage chamber 200 and a portion B located outside the drainage chamber 200; the height of the portion A is 3 / 10 to 9 / 10 of the height of the drainage chamber 200, and in some embodiments, 1 / 2 to 4 / 5 can be selected. By setting the height of the portion A of the drainage pipe 210, the wastewater flowing into the drainage chamber 200 can be stored and diluted for a second time, and the water level of the wastewater can also be used to balance the upper and lower chambers. The drainage pipe 210 can be made of a stainless steel pipe and welded through the bottom of the drainage chamber 200.
[0028] Furthermore, a gas negative pressure generator 211 is provided on the drainage pipe 210 outside the drainage chamber 200 (ie, on the B portion of the drainage pipe 210 ), which can generate negative pressure to draw away the waste liquid in the drainage chamber.
[0029] In actual production, due to the generation of acetone gas in the waste silk kettle, if a conventional water washing device is used to dissolve the acetone and then discharge it. The drainage function relies solely on the deadweight of the liquid in the drain tank to achieve drainage. However, the entire pretreatment process uses a negative pressure extraction circuit, and the drain tank is affected by the negative pressure state, so that the liquid in the cavity may not be able to be discharged by itself. As a result, after the water washing chamber is 100% full of liquid, there is a risk that the wastewater will enter the subsequent treatment link from the sample gas outlet. When the wastewater flows out of the sample gas outlet, liquid resistance will be formed at the subsequent 5μm precision filter position. This will cause insufficient sample gas flow of the analyzer, reduced measurement accuracy and stability, and frequent triggering of preset high-concentration false alarms.
[0030] The problem of poor drainage can be effectively solved by setting a gas negative pressure generator 211 on the B part of the drainage pipe 210. By adjusting the pressure value of the air filter pressure reducing valve 212 of the gas negative pressure generator 211, the negative pressure value extracted by the end of the gas negative pressure generator 211 close to the drainage chamber 200 is lower than the pressure value of the drainage chamber 200. When the liquid level in the drainage chamber 200 is higher than the A part of the drainage pipe 210, it will be drawn out in time, so that the pressure and liquid level of the water washing chamber 100 and the drainage chamber 200 reach a dynamic balance. Finally, the analyzer can obtain a pure, stable and qualified sample gas supply.
[0031] Furthermore, flow meters are provided on the air outlet pipe 120 and the water inlet pipe 130 respectively to ensure that the inlet and outlet flows are adjustable.
[0032] The sample gas pretreatment device provided by the embodiment of the utility model can effectively eliminate the problems such as zero drift of the analyzer, extended analysis lag time, frequent clogging of the sampling tube, etc.; the liquid acetone condensed in the sample gas is treated to achieve the goal of qualified emissions; at the same time, the maintenance workload of the equipment can be reduced and the maintenance cost can be saved. At the same time, because the medium used by the device is tap water and compressed air, it can be applied to different production environments and has a wide range of uses, especially in places with explosion-proof requirements. In addition, the device can filter fine dust, and the effect is very obvious. Subsequently, it is matched with a vortex condenser to eliminate water vapor, and the use effect is better.
[0033] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation on the present invention.
[0034] In the description of the present utility model, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0036] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.
Claims
1. A sample gas pretreatment device, characterized in that: The invention comprises an upper water-washing chamber (100) and a lower drainage chamber (200), wherein the water-washing chamber (100) is connected to the drainage chamber (200) via a connecting pipe (300); an air inlet pipe (110) and an air outlet pipe (120) are provided at the top of the water-washing chamber (100), wherein the air inlet pipe (110) extends to the bottom of the water-washing chamber (100); a filter layer (140) is provided inside the water-washing chamber (100); the water-washing chamber (100) is connected to a water inlet pipe (130); and the drainage chamber (200) is provided with a drainage pipe (210).
2. A sample gas pretreatment device according to claim 1, characterized in that: The filter layer (140) is disposed at the bottom of the water washing chamber (100), and the upper end of the connecting pipe (300) is higher than the filter layer (140).
3. A sample gas pretreatment device according to claim 1 or 2, characterized in that: The filter layer (140) comprises granular quartz sand.
4. A sample gas pretreatment device according to claim 3, characterized in that: The particle size of the granular quartz sand is 2-4 mm.
5. A sample gas pretreatment device according to claim 2, characterized in that: The thickness of the filter layer (140) is 1 / 5 to 3 / 5 of the height of the water washing chamber (100).
6. A sample gas pretreatment device according to claim 1, characterized in that: The drainage pipe (210) comprises a portion A located inside the drainage chamber (200) and a portion B located outside the drainage chamber (200); the height of the portion A is 3 / 10 to 9 / 10 of the height of the drainage chamber (200).
7. A sample gas pretreatment device according to claim 6, characterized in that: The height of the A portion is 1 / 2 to 4 / 5 of the height of the drainage chamber (200).
8. A sample gas pretreatment device according to claim 6, characterized in that: A gas negative pressure generator (211) is provided on the liquid discharge pipe (210) located outside the liquid discharge chamber (200).
9. A sample gas pretreatment device according to claim 1, characterized in that: The air outlet pipe (120) and the water inlet pipe (130) are respectively provided with flow meters.