A sampling device for acid-making flue gas

Abstract

The present invention discloses a sampling device for acid-making flue gas, comprising: a sampler for sampling acid-making flue gas, a sampling channel, comprising: a first pipe fitting, a valve, a second pipe fitting and a sealing member connected in sequence; the first pipe fitting is fixed on the acid-making flue gas pipeline and communicated with the acid-making flue gas pipeline; a through hole is opened in the middle of the sealing member; the through hole comprises: a first pipe diameter portion and a second pipe diameter portion, the pipe diameter of the first pipe diameter portion is larger than the pipe diameter of the second pipe diameter portion, and the first pipe diameter portion is located on a side of the through hole away from the valve; the pipe diameter of the first pipe diameter portion is slightly larger than the outer diameter of the sampler, and the pipe diameter of the second pipe diameter portion is slightly smaller than the outer diameter of the sampler. By setting a sealing member, the sampling channel is sealed by utilizing the pipe diameter of the through hole portion of the sealing member being slightly smaller than the outer diameter of the sampler, thereby effectively preventing leakage of acid-making flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas acid production, and in particular to a sampling device for flue gas used in acid production. Background Art

[0002] The main raw material for flue gas acid production is SO2 flue gas, which is a toxic and harmful gas. According to the requirements of the flue gas acid production process, in order to ensure the quality of sulfuric acid products, in order to obtain representative and accurate analytical data, it is necessary to sample and monitor the acid mist, moisture, dust, arsenic, fluorine, sulfur dioxide and other indicators in the flue gas at the monitoring point from the drying tower to the fan outlet. The flue gas at this monitoring point has the characteristics of high sulfur dioxide concentration (7%-15%) and high positive pressure (above 0.3MPa). During the sampling process, the flue gas will be rapidly ejected from the measuring hole accompanied by acid mud splashing, which will not only cause harm to the sampling personnel but also pollute the environment.

[0003] Therefore, how to improve the sampling of acid-making flue gas is an urgent problem to be solved. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a sampling device for acid-making flue gas, aiming to solve the problem of gas leakage in the existing sampling of acid-making flue gas.

[0005] A sampling device for acid-making flue gas, a sampler for sampling acid-making flue gas, wherein the sampling device further comprises:

[0006] A sampling channel, the sampling channel comprising: a first pipe fitting, a valve, a second pipe fitting and a sealing member connected in sequence;

[0007] The first pipe is fixed on the acid-making fume pipeline and is connected to the acid-making fume pipeline; a through hole is opened in the middle of the sealing member;

[0008] The through hole includes: a first tube diameter portion and a second tube diameter portion, the tube diameter of the first tube diameter portion is larger than the tube diameter of the second tube diameter portion, and the first tube diameter portion is located on the side of the through hole away from the valve; the tube diameter of the first tube diameter portion is larger than the outer diameter of the sampler, and the tube diameter of the second tube diameter portion is smaller than the outer diameter of the sampler.

[0009] The above-mentioned sampling device for acid-making flue gas is provided with a sealing member, and the middle through hole of the sealing member is arranged so that part of the tube diameter is slightly larger than the outer diameter of the sampler, and part of the tube diameter is slightly smaller than the outer diameter of the sampler. During the sampling process, the sampling channel is sealed by utilizing the part of the tube diameter of the through hole of the sealing member that is slightly smaller than the outer diameter of the sampler, thereby effectively preventing leakage of the acid-making flue gas.

[0010] Optionally, in the sampling device for acid-making flue gas, the sampler is a glass tube sampler, and the outer diameter of the glass tube sampler is 6-8 mm.

[0011] Optionally, in the sampling device for acid-making flue gas, the sealing member is a rubber plug, and the rubber plug is plugged onto one end of the second pipe member through a coil.

[0012] Optionally, in the sampling device for acid-making flue gas, the first tube diameter portion is obtained by expanding the second tube diameter portion.

[0013] Optionally, in the sampling device for acid-making flue gas, the length of the first tube diameter portion is greater than the length of the second tube diameter portion.

[0014] Optionally, in the sampling device for acid-making flue gas, the sampler includes an identification mark for identifying the length of the sampler extending into the sampling channel.

[0015] Optionally, in the sampling device for acid-making flue gas, the valve is a ball valve.

[0016] Optionally, in the sampling device for acid-making flue gas, the length of the first pipe is 50-170 mm.

[0017] Optionally, in the sampling device for acid-making flue gas, the first pipe fitting is a 316L stainless steel pipe with an outer diameter of 30 mm and an inner diameter of 25 mm, one end of which is welded to the acid-making flue gas pipeline; and the valve is a DN30 stainless steel valve.

[0018] Optionally, in the sampling device for acid-making flue gas, the diameter of the first tube diameter portion is 9 mm, and the diameter of the second tube diameter portion is 7 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A process flow chart of flue gas acid production provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the structure of a sampling device for acid-making flue gas provided in an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view of a rubber stopper provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the sampling state of a sampling device for acid-making flue gas provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] The process of using flue gas to make acid is as follows: Figure 1 As shown, it includes an absorption tower circulation pump tank 1, a first absorption tower 2, a second absorption tower 3, a first heat exchanger 4, a second heat exchanger 5, a third heat exchanger 6, a fourth heat exchanger 7, a converter 8, a fan 9, a drying tower 10 and an exhaust chimney 11. According to the requirements of the flue gas acid production process, the quality of sulfuric acid products is guaranteed, and in order to obtain representative and accurate analysis data, it is necessary to sample and monitor the acid mist, moisture, dust, arsenic, fluorine, sulfur dioxide and other indicators in the flue gas at the monitoring points from the drying tower 10 to the fan outlet 9.

[0026] At present, the controlled analysis sampling of sulfuric acid at the fan outlet under high positive pressure is carried out by opening the sampling hole valve and inserting a glass sampling gun (sampler) for sampling. During the sampling process, when the personnel open or close the valve, the acid-making flue gas is instantly under the action of high positive pressure, and high-concentration SO2 flue gas and acid sludge are instantly splashed. The original cast iron pipe fittings are relatively thin and easily blocked by acid sludge, resulting in high safety risks for sampling personnel (they may be choked by high-concentration SO2 flue gas, burned by acid sludge, and burned by high-pressure flue gas splashing) and high environmental risks in the operation (the sulfur dioxide concentration of the splashing flue gas is about 7%-15%, and it takes an average of 10 seconds for the sampling tube to leak high-concentration SO2 flue gas in and out of the test hole to collect a sample. There are 10 measuring holes in the III and IV series, with a flow rate of about 12m / s. With 48 weeks of production per year, it is estimated that 18,000 liters of high-concentration SO2 acid-making flue gas will leak into the air and pollute the environment).

[0027] Based on this, the present invention provides a solution that can solve the above technical problems, and its details will be described in subsequent embodiments.

[0028] Please refer to Figure 2 ,like Figure 2As shown, an embodiment of the present invention provides a sampling device 12 for acid-making flue gas, the sampling device 12 comprising: a sampler 100 for sampling acid-making flue gas and a sampling channel 200, the sampling channel 200 comprising: a first pipe 201, a valve 202, a second pipe 203 and a sealing member 204 connected in sequence; the first pipe 201 is fixed on the acid-making flue gas pipeline 300 and communicated with the acid-making flue gas pipeline 300; a through hole 240 is opened in the middle of the sealing member 204; the through hole 240 comprises: a first tube diameter portion 241 and a second tube diameter portion 242, the tube diameter of the first tube diameter portion 241 is larger than the tube diameter of the second tube diameter portion 242, and the first tube diameter portion 241 is located on a side of the through hole away from the valve 202; the tube diameter of the first tube diameter portion 241 is slightly larger than the outer diameter of the sampler 100, and the tube diameter of the second tube diameter portion 242 is slightly smaller than the outer diameter of the sampler 100.

[0029] In this embodiment, the acid-making flue gas pipeline 300 is Figure 1 The connecting pipes between the blower 9 and the drying tower 10, the pipe diameters and the layout of the pipes can be set according to actual needs and are not limited here. It is easy to understand that a flue gas test hole is opened on the pipe, and the first pipe fitting 201 of the sampling channel can be fixed to the test hole by welding, and the first pipe fitting 201 is perpendicular to the pipe. The sampling device for acid-making flue gas includes two parts, one part is fixed on the pipe (acid-making flue gas passes through the pipe), and the other part is movable (such as a sampler). It can also be understood that one sampler 100 corresponds to multiple sampling channels 200.

[0030] In this embodiment, the term "slightly larger than" means that the sampler 100 can move (extend in, pull out) in the seal 204 without being restricted, but the gap between the sampler and the through hole wall should also be smaller. For example, the outer diameter of the sampler is 8 mm, and the diameter of the through hole can be 9 mm. Similarly, the term "slightly smaller than" means that the sampler 100 can seal the through hole when passing through the through hole. That is to say, when the outer diameter of the sampler is 8 mm, the diameter of the through hole can be 7 mm. Of course, the above-mentioned specific values ​​are only examples and do not limit the sampler and the through hole.

[0031] In one embodiment of the present invention, the sampler 100 is a glass sampler, i.e., a glass tube, one end of which is tapered to facilitate the sampler 100 to extend into the sampling channel 200. The outer diameter of the glass tube can be 6 mm to 8 mm, and other diameters can be selected according to actual needs. The length of the glass tube can be 600 mm to 700 mm, such as 630 mm, for easy operation.

[0032] In one embodiment of this implementation, combined with Figure 3 The sealing member 204 is a rubber plug, a through hole 240 is opened in the middle of the rubber plug, a coil (or a thread) is arranged on the outer surface of the rubber plug, one end of which is plugged into the second pipe fitting (partially exposed on one side of the second pipe fitting, that is, partially protruding from one end of the second pipe fitting), and the rubber plug can be fixed by the coil to prevent it from falling off during use.

[0033] Furthermore, the through hole 240 can be prepared by using a puncher (of course, other methods are also possible). For example, a 7mm puncher is first used to punch a through hole 240 on the rubber plug, and then a 9mm puncher is used to expand the through hole 240 (partial expansion, not all expansion). After expansion, the through hole 240 includes a first tube diameter portion with a tube diameter of 9mm and a second tube diameter portion with a size of 7mm. Among them, the length of the first tube diameter portion is greater than the length of the second tube diameter portion. The size of the rubber plug can be set according to actual needs. For example, its length can be 35mm, then the length of the first tube diameter portion can be set to 20mm, and the length of the second tube diameter portion can be set to 15mm.

[0034] In one implementation of this embodiment, a mark (not shown) is also provided on the sampler 100, and the mark includes but is not limited to numbers, mark lines, mark points, etc. The mark can accurately know the distance that the sampler 100 extends into the sampling channel 200 (that is, the position of the sampler in the sampling channel is known).

[0035] Exemplary techniques, combined with Figure 4The sampling channel 200 is fixed to the acid-making flue gas pipeline 300 by welding, and the sealing member 204 is a rubber plug, which is plugged into one end of the second pipe 203. If the distance from the exposed end of the rubber plug to the valve core of the valve 202 is 73 mm, and the distance of the sampler 100 extending into the sampling channel is 73 mm, a mark is made on the sampler, and when the sampler 100 is inserted into the sampling pipeline, reaching this scale indicates that one end of the sampler 100 has entered the inside of the valve, but has not contacted the valve core of the valve at this time (at the same time, it will not affect the opening or closing of the valve, and the valve core will not damage the sampling tube when the valve is opened or closed, and the sampling tube will not hinder the movement of the valve core). When the sampling tube 100 is inserted for sampling, when it reaches the mark, the valve is opened. Since the diameter of the second diameter part of the through hole of the rubber stopper is slightly smaller than the diameter of the sampler 100, the sampler 100 is in close contact with the second diameter part, that is, the sampler 100 can seal the through hole. Although the valve is opened, the acid-making flue gas will not leak. Since the diameter of the first diameter part is slightly larger than the diameter of the sampler 100, the sampler can be easily extended further until it is inserted into the acid-making flue gas pipeline. The sampling is completed. When the sampler 100 is pulled out, when the mark appears, the valve can be closed and it can be pulled out again until it is completely pulled out. When closing the valve, since the sampler has a sealing effect on the through hole, when the valve is closed, there will be no leakage of acid-making flue gas.

[0036] In one implementation of this embodiment, the valve may be a ball valve, which is a commonly used ball valve in the prior art. Its specific structure is a known structure and will not be described in detail here.

[0037] In one implementation of this embodiment, the first pipe 201 is a 316L stainless steel pipe with an outer diameter of 30 mm and an inner diameter of 25 mm. One end of the first pipe 201 is welded to the acid-making flue gas pipeline 300; the valve is a DN30 stainless steel valve. The length of the first pipe 201 can be 50 mm to 70 mm, 70 mm to 90 mm, 90 mm to 110 mm, 110 mm to 130 mm, 130 mm to 150 mm, or 150 mm to 170 mm.

[0038] In this embodiment, the second pipe 203 is a stainless steel sleeve, which can be 150 mm long and made of 316L stainless steel. It is easy to understand that the connection between the valve and the first pipe and the second pipe is flange connection, and other connection methods are also possible.

[0039] In summary, the present invention provides a sampling device for acid-making flue gas, the device comprising: a sampler for sampling acid-making flue gas, a sampling channel, the sampling channel comprising: a first pipe fitting, a valve, a second pipe fitting and a sealing member connected in sequence; the first pipe fitting is fixed on the acid-making flue gas pipeline and communicated with the acid-making flue gas pipeline; a through hole is opened in the middle of the sealing member; the through hole comprises: a first diameter portion and a second diameter portion, the diameter of the first diameter portion is larger than the diameter of the second diameter portion, the first diameter portion is located on the side of the through hole away from the valve; the diameter of the first diameter portion is slightly larger than the outer diameter of the sampler, and the diameter of the second diameter portion is slightly smaller than the outer diameter of the sampler. By setting a sealing member, and setting the middle through hole of the sealing member to have a diameter slightly larger than the outer diameter of the sampler and a diameter slightly smaller than the outer diameter of the sampler, during the sampling process, the sampling channel is sealed by using the diameter of the through hole of the sealing member to be slightly smaller than the outer diameter of the sampler, thereby effectively preventing the leakage of acid-making flue gas.

[0040] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A sampling device for acid-making flue gas, comprising a sampler for sampling acid-making flue gas, characterized in that: Also includes: A sampling channel, the sampling channel comprising: a first pipe fitting, a valve, a second pipe fitting and a sealing member connected in sequence; The first pipe is fixed on the acid-making fume pipeline and is connected to the acid-making fume pipeline; a through hole is opened in the middle of the sealing member; The through hole comprises: a first tube diameter portion and a second tube diameter portion, the tube diameter of the first tube diameter portion is larger than the tube diameter of the second tube diameter portion, and the first tube diameter portion is located at a side of the through hole away from the valve; the tube diameter of the first tube diameter portion is slightly larger than the outer diameter of the sampler, and the tube diameter of the second tube diameter portion is slightly smaller than the outer diameter of the sampler; The slightly larger than means that the sampler can move in the seal without being restricted, but the gap between the sampler and the through hole wall should also be smaller; the slightly smaller than means that the sampler can seal the through hole when passing through the through hole; The sealing member is a rubber plug, which is fixed to one end of the second pipe member by means of a coil plugging; the first pipe diameter portion is obtained by expanding the second pipe diameter portion; The sampler includes an identification mark for identifying the length of the sampler extending into the sampling channel; when the sampler is extended into the sampling pipeline, reaching the identification mark indicates that one end of the sampler has entered the interior of the valve, but has not yet contacted the valve core of the valve.

2. The sampling device for acid-making flue gas according to claim 1, characterized in that: The sampler is a glass tube sampler, and the outer diameter of the glass tube sampler is 6-8 mm.

3. The sampling device for acid-making flue gas according to claim 1, characterized in that: The length of the first tube diameter portion is greater than the length of the second tube diameter portion.

4. The sampling device for acid-making flue gas according to claim 1, characterized in that: The valve is a ball valve.

5. The sampling device for acid-making flue gas according to claim 1, characterized in that: The length of the first pipe is 50-170 mm.

6. The sampling device for acid-making flue gas according to any one of claims 1 to 5, characterized in that: The first pipe fitting is a 316L stainless steel pipe with an outer diameter of 30 mm and an inner diameter of 25 mm, one end of which is welded to the acid-making fume pipeline; the valve is a DN30 stainless steel valve.

7. The sampling device for acid-making flue gas according to claim 3, characterized in that: The diameter of the first diameter portion is 9 mm, and the diameter of the second diameter portion is 7 mm.

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