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Natural gas flame arresters are designed and manufactured based on the principle of extinguishing flames due to heat loss when they pass through narrow pores in thermal conductors. They are suitable for storage and flare systems of combustible gas pipelines, such as gasoline, kerosene, light diesel, benzene, methyl benzene, crude oil and other oil products, gas purification systems, gas analysis systems, coal mine gas emission systems, heating furnace fuel gas pipeline networks, and can also be used as pipeline supplies for acetylene, oxygen, nitrogen, and natural gas. This valve can be used in conjunction with a breathing valve or alone.
Item NO.:
XUVAL-372Lead Time:
45daysProduct Orgin:
ChinaBrand:
XUVALShipping Port:
ShanghaiPayment:
100%Color:
redMOQ:
1| caliber DN | inch | width L/mm | height H/mm |
| 20 | 3/4" | 125 | 182 |
| 25 | 1" | 130 | 195 |
| 32 | 1-1/4" | 150 | 208 |
| 40 | 1-1/2" | 170 | 220 |
| 50 | 2" | 190 | 240 |
| 65 | 2-1/2" | 205 | 250 |
| 80 | 3" | 220 | 260 |
| 100 | 4" | 240 | 275 |
| 125 | 5" | 280 | 300 |
| 150 | 6" | 330 | 325 |
| 200 | 8" | 385 | 365 |
| 250 | 10" | 450 | 405 |
| 300 | 12" | 520 | 440 |
| 350 | 14" | 595 | 465 |
| 400 | 16" | 665 | 495 |
| 450 | 18" | 710 | 525 |
| 500 | 20" | 780 | 565 |
There are currently two main views on the working principle of natural gas flame arresters: one is based on heat transfer; One is based on the wall effect.
1. One of the necessary conditions for heat transfer in combustion is to reach a certain temperature, which is the ignition point. If it is lower than the ignition point, combustion will stop. According to this principle, as long as the temperature of the combustion material is lowered below its ignition point, the spread of the flame can be stopped. When the flame passes through many small channels of the flame arrester, it will become several small flames. When designing the flame arrester's internal flame arrester components, the contact area between the small flames and the channel wall should be expanded as much as possible to strengthen heat transfer and reduce the flame temperature below the ignition point, thereby preventing flame propagation.
2. The wall effect of combustion and explosion is not a direct reaction between molecules, but is stimulated by external energy, causing molecular bonds to be broken and activated molecules to be produced. The activated molecules then split into short lived but very active free radicals, which collide with other molecules to produce new products. At the same time, new free radicals are also produced and continue to react with other molecules. When the combustible gas passes through the narrow channel of the flame arrester, the probability of collision between free radicals and the channel wall increases, and the number of free radicals participating in the reaction decreases. When the channel of the flame arrester is narrow to a certain extent, the collision between free radicals and the channel wall dominates. Due to the sharp decrease in the number of free radicals, the reaction cannot continue, that is, the combustion reaction cannot continue through the flame arrester. Spread.
3. The maximum experimental safety gap (MESG) is the value at which the flame passes through a small channel of the flame arrester and cools down inside the channel. When the flame is divided to a certain extent, the heat transferred through the channel is enough to lower the temperature below the ignition point of the combustible material, causing the flame to extinguish. Alternatively, explained by the wall effect, when the channel is narrow to a certain extent, the collision between free radicals and the pipeline wall dominates, and the free radicals are significantly reduced, making the combustion reaction unable to continue. Therefore, the size of the channel that can precisely extinguish the flame under certain conditions (0.1 MPa, 20 ℃) is defined as the maximum experimental safety gap (MESG) The channel size of flame arrester components is a key factor determining the performance of flame arresters, and different gases have different MESG values. Therefore, when selecting flame arresters, the MESG value should be determined based on the composition of combustible gases. In specific selection, gases are also divided into several levels based on the MESG value. Currently, two methods are commonly used internationally. One is the classification method of the National Electrical Association (NEC) in the United States, which divides gases into four levels (A, B, C, D) based on their MESG value; Another type is the method of the International Electrotechnical Association (IEC), which also divides gases into four levels (IIC, IIB, IIA, and I). The MESG values and test gases for each type of gas divided by the two standards are shown in the table.
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Natural gas flame arresters are designed and manufactured based on the principle that flames extinguish due to heat loss when passing through narrow pores in thermal conductors. Suitable for storage and flare systems, gas purification systems, gas analysis systems, coal mine gas emission systems, heating furnace fuel gas pipelines for combustible gas pipelines, such as gasoline, kerosene, light diesel, benzene, methyl benzene, crude oil and other oil products, as well as pipeline supplies for acetylene, oxygen, nitrogen, and natural gas. This valve can be used in conjunction with a breathing valve or as a standalone device.
Product use: D73H,D373H,D673H,D973H PN10 ~ PN100 three eccentric double clamp hard seal electric butterfly valve adopts precise J-shaped elastic seal ring and three eccentric multi-layer metal hard seal structure, which is widely used in metallurgy, electric power, petrochemical industry, water supply and drainage, municipal construction and other industrial pipelines with medium temperature ≤ 400 ℃ to regulate flow and carry off fluid.
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