Hydrogen flame arrester

Abstract

The utility model discloses a hydrogen flame arrester with flame arresting and drainage functions, which comprises a sealable flame arrester body, an inlet connecting pipe is arranged on the lower portion of the flame arrester body, and an outlet connecting pipe is arranged on the upper portion of the flame arrester body. A fire-retardant and gas-water separation structure is arranged in the flame arrester body between the upper edge of the inlet connecting pipe and the lower edge of the outlet connecting pipe, the fire-retardant and gas-water separation structure comprises an upper-layer filter plate and a lower-layer filter plate, and a fire-retardant filler layer is filled between the upper-layer filter plate and the lower-layer filter plate; the fire-retardant packing layer comprises first Raschig ring layers regularly arranged on the lower filter plate and a second Raschig ring layer formed by filling Raschig rings irregularly arranged between the first Raschig ring layers and the upper filter plate, and a water storage cavity and a drainage connector are arranged at the bottom of the flame arrester body. Hydrogen containing moisture is subjected to gas-liquid separation in the flame arrester, the risk caused by condensed water accumulated in a pipeline is reduced, nitrogen can be introduced to further enhance the flame arresting function, and the safety is good.

Description

Technical Field

[0001] The utility model relates to a fire-blocking and drainage device used in a hydrogen transmission pipeline. Background Art

[0002] In a typical PVC production process, hydrogen chloride synthesis involves mixing and burning raw hydrogen and chlorine in a synthesis furnace to generate hydrogen chloride gas. Because the raw hydrogen produced by the electrolyzer has high humidity, it carries a small amount of water that is difficult to completely remove. Conventional pipeline flame arresters, such as the detonation-type flame arrester disclosed in CN17982829A, lack drainage capabilities. This means that the water-carrying hydrogen easily condenses and accumulates in the hydrogen delivery pipeline before entering the synthesis furnace, causing safety issues with the pipeline's liquid seal.

[0003] Therefore, it is necessary to design a hydrogen flame arrester with drainage function. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a hydrogen flame arrester with both fire arresting and water drainage functions.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a hydrogen flame arrester includes a sealable flame arrester body, an inlet pipe is arranged at the lower part of the flame arrester body, an outlet pipe is arranged at the upper part of the flame arrester body, a fire-stopping and gas-water separation structure is arranged inside the flame arrester body between the upper edge of the inlet pipe and the lower edge of the outlet pipe, the fire-stopping and gas-water separation structure includes an upper filter plate and a lower filter plate, a fire-stopping filler layer is filled between the upper filter plate and the lower filter plate, and a water storage chamber and a drainage interface are provided at the bottom of the flame arrester body.

[0006] The upper filter plate and the lower filter plate can adopt a composite structure of flower plates or multi-layer filter mesh, which is mainly used for buffering hydrogen with water and gas-liquid separation. The hydrogen after dehydration is output through the upper outlet pipe of the flame arrester. The water storage cavity at the bottom of the flame arrester can collect accumulated water and discharge it regularly through the drainage interface at the bottom; the fire-retardant filler layer is made of porous flame retardant material. When combustion occurs, the flame is divided into many small flame streams when passing through the small channels inside these porous flame retardant materials. Since the contact area between these small flame streams and the channel wall is increased, the heat transfer is enhanced, resulting in a decrease in the flame temperature and failure to reach its ignition point, thereby extinguishing the flame and preventing the flame from spreading to the hydrogen pipeline.

[0007] The fire-retardant packing layer includes a first Raschig ring layer composed of regularly arranged Raschig rings on the lower filter plate, and a second Raschig ring layer composed of irregularly arranged Raschig rings filling the space between the first and upper filter plates. Specifically, the fire-retardant packing layer completely fills the space between the two filter plates. The first layer of Raschig rings is regularly arranged to appropriately reduce hydrogen gas flow resistance, while the second layer of Raschig rings is irregularly arranged to appropriately increase the length of the flame-retardant channel.

[0008] Also based on the above considerations of reducing the resistance to hydrogen passing through and increasing the length of the flame-retardant channel, the size of the Raschig rings used in the first Raschig ring layer is larger than the size of the Raschig rings used in the second Raschig ring layer.

[0009] After testing, it was found that the first Raschig ring layer used 50mm ceramic Raschig rings and the second Raschig ring layer used 25mm ceramic Raschig rings, and the results were very good.

[0010] According to tests, when Raschig rings are used as filler, the thickness of the fire-retardant filler layer is not less than 500 mm.

[0011] The beneficial effects of the utility model are: gas-liquid separation can be completed for hydrogen containing water during transportation, the risk caused by accumulation of condensed water in the pipeline can be reduced, nitrogen can be connected to further enhance the fire-retardant function, and the safety is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure and usage of the hydrogen flame arrester of the utility model.

[0013] Markings in the figure are: 1-hydrogen program-controlled valve, 2-hydrogen inlet pipe, 3-nitrogen program-controlled valve, 4-nitrogen inlet pipe, 5-hydrogen flame arrester, 6-flame arrester outlet pipe, 7-drain valve, 8-drainage pipe, 50-sealing plate, 51-flame arrester body, 52-inlet pipe, 53-outlet pipe, 54-water storage chamber, 55-drainage interface, 56-upper filter plate, 57-lower filter plate, 58-second Raschig ring layer, 59-first Raschig ring layer. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Example:

[0016] like Figure 1As shown, the hydrogen flame arrester of the present invention includes a flame arrester body 51, and an openable and closable sealing plate 50 is provided on the top of the flame arrester body 51, which is convenient for filling the flame arrester with a fire-retardant filler layer and for inspecting the internal structure of the flame arrester. An inlet pipe 52 is arranged at the lower part of the flame arrester body 51, and an outlet pipe 53 is arranged at the upper part of the flame arrester body 51. A fire-retardant and gas-water separation structure is arranged inside the flame arrester body between the upper edge of the inlet pipe 52 and the lower edge of the outlet pipe 53, and hydrogen with water is separated from gas and water during entering and leaving the device. A water storage chamber 54 and a drainage interface 55 are provided at the bottom of the flame arrester body 51. The water storage chamber 54 is used to accumulate condensed water condensed during the gas-water separation process and regularly discharge it through the drainage interface 55. The fire-retardant and gas-water separation structure includes an upper filter plate 56 and a lower filter plate 57, and a fire-retardant filler layer is filled between the upper filter plate 56 and the lower filter plate 57. The fire-retardant filler layer can be one layer or multiple layers. The fire-retardant filler layer can fill the space between the two filter plates. When the hydrogen flame arrester is installed at a sufficient height, there can also be some buffer space between the fire-retardant filler layer and the two filter plates.

[0017] To minimize the size of the entire flame arrester, the lower filter plate serves as support for the flame-retardant packing layer. To balance the requirements of minimal hydrogen resistance and optimal flame arrestance, the fire-retardant packing layer includes a first Raschig ring layer 59, composed of regularly arranged Raschig rings on the lower filter plate 57. A second Raschig ring layer 58, composed of irregularly arranged Raschig rings, fills the gap between the first Raschig ring layer 59 and the upper filter plate 56. Numerous tiny channels are formed between the Raschig rings, through which the flame is divided into numerous fine flame streams. The increased contact area between these fine flame streams and the channel walls enhances heat transfer, lowering the flame temperature and preventing it from reaching its ignition point. This prevents backfire from the furnace flame and the spread to the hydrogen pipeline.

[0018] The first Raschig ring layer 59 uses 50mm ceramic Raschig rings, and the layer height of this layer is an integer multiple of the height of a single Raschig ring. The second Raschig ring layer 58 uses 25mm ceramic Raschig rings, which are randomly stacked on the regularly arranged first Raschig ring layer 59. The spacing between the upper filter plate 56 and the lower filter plate 57 is 500mm. The thickness of the entire fire-retardant filler layer is 500mm in this embodiment.

[0019] like Figure 1As shown, the above-mentioned hydrogen flame arrester is used in the auxiliary equipment of hydrogen chloride synthesis production. The hydrogen flame arrester 5 is made of carbon steel and has a vertical container structure. The bottom head is used as a water storage chamber 54 to ensure that there is sufficient space for collecting the accumulated water separated from the hydrogen. The hydrogen inlet is at the inlet pipe 52 at the lower part of the flame arrester, and the hydrogen outlet is at the outlet pipe 53 at the upper part of the flame arrester near the sealing plate 50. The inlet and outlet pipes are low inlet and high out. The auxiliary equipment includes a hydrogen input pipe 2 and a nitrogen input pipe 4. The hydrogen input pipe 2 is provided with a hydrogen program-controlled valve 1, and the nitrogen input pipe 4 is provided with a nitrogen program-controlled valve 3. The hydrogen input pipe 2 and the nitrogen input pipe 4 are simultaneously connected to the inlet pipe 52 of the hydrogen flame arrester 5. The outlet pipe 53 of the hydrogen flame arrester 5 is connected to the flame arrester outlet pipe 6, and the hydrogen after gas-liquid separation is sent to the hydrogen chloride synthesis furnace. The drainage interface 55 of the hydrogen flame arrester 5 is connected to the drainage pipe 8 through a drainage valve 7.

[0020] When the flame arrester is in operation, hydrogen from the hydrogen main pipe enters the hydrogen inlet pipe 2 through the hydrogen program-controlled valve 1. The delivered hydrogen enters the hydrogen flame arrester 5 through the inlet pipe 52. The water entrained in the hydrogen is separated inside the flame arrester and stored in the water storage chamber 54 at the bottom of the flame arrester. The clean hydrogen is then delivered to the synthesis furnace through the flame arrester outlet pipe 6. The accumulated water at the bottom of the flame arrester is transported to the water storage tank for storage through the drain valve 7 and the drain pipe 8. Nitrogen from the nitrogen main pipe is also connected to the inlet pipe 52 of the hydrogen flame arrester 5 through the nitrogen program-controlled valve 3 and the nitrogen inlet pipe 4. If hydrogen flashback occurs, the hydrogen program-controlled valve 1 is immediately closed, the nitrogen program-controlled valve 3 is opened, and the hydrogen flame arrester 5 and the flame arrester outlet pipe 6 are filled with nitrogen to extinguish the fire. This can achieve the fire extinguishing function of hydrogen caused by flame flashback in the hydrogen chloride synthesis furnace, while simultaneously eliminating the safety hazards caused by the accumulation of water entrained by hydrogen in the hydrogen inlet pipe, ensuring the safety of the production system.

[0021] This new hydrogen flame arrester, installed in front of a hydrogen chloride synthesis furnace, features a simple structure and allows for remote monitoring and fully automatic control, eliminating the need for on-site personnel. Condensed water entrained in the hydrogen is separated through the flame arrester's internal buffering space. Condensed water accumulated at the bottom of the flame arrester is manually drained periodically and then piped into a water storage tank for storage and treatment. This eliminates the potential safety hazards associated with the accumulation of entrained condensed water and ensures the safety of the production system.

Claims

1. A hydrogen flame arrester, comprising a sealable flame arrester body (51), an inlet pipe (52) arranged at the lower portion of the flame arrester body (51), an outlet pipe (53) arranged at the upper portion of the flame arrester body (51), and a flame arresting and gas-water separation structure arranged inside the flame arrester body between the upper edge of the inlet pipe (52) and the lower edge of the outlet pipe (53), wherein: The fire arrester and gas-water separation structure comprises an upper filter plate (56) and a lower filter plate (57), a fire arrester filler layer is filled between the upper filter plate (56) and the lower filter plate (57), and a water storage chamber (54) and a drainage interface (55) are provided at the bottom of the flame arrester body (51).

2. The hydrogen flame arrester according to claim 1, wherein: The fire-retardant filler layer comprises a first Raschig ring layer (59) composed of Raschig rings regularly arranged on a lower filter plate (57), and a second Raschig ring layer (58) composed of Raschig rings irregularly arranged is filled between the first Raschig ring layer (59) and the upper filter plate (56).

3. The hydrogen flame arrester according to claim 2, wherein: The size of the Raschig rings used in the first Raschig ring layer (59) is larger than the size of the Raschig rings used in the second Raschig ring layer (58).

4. The hydrogen flame arrester according to claim 2, wherein: The first Raschig ring layer (59) uses ceramic Raschig rings with a specification of 50 mm, and the second Raschig ring layer (58) uses ceramic Raschig rings with a specification of 25 mm.

5. The hydrogen flame arrester according to claim 1, 2, 3 or 4, characterized in that: The thickness of the fire-retardant filler layer is not less than 500 mm.

6. The hydrogen flame arrester according to claim 1, 2, 3 or 4, characterized in that: The inlet pipe (52) is connected to (2) and the nitrogen inlet pipe (4) at the same time. The hydrogen inlet pipe (2) is provided with a hydrogen program-controlled valve (1), and the nitrogen inlet pipe (4) is provided with a nitrogen program-controlled valve (3).

7. The hydrogen flame arrester according to claim 1, 2, 3 or 4, characterized in that: The outlet pipe (53) is connected to the hydrogen chloride synthesis furnace.

8. The hydrogen flame arrester according to claim 1, 2, 3 or 4, characterized in that: The drainage interface (55) is connected to the drainage pipe (8) via a drainage valve (7).

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