The working principle of the flame arrester of the pipe corrugated flame arrester

There are two main views on the working principle of flame arresters: one is based on heat transfer; One is based on the device wall effect. One of the necessary conditions for combustion is to reach a certain temperature, i.e. the ignition point.

Below the ignition point, the combustion stops. According to this principle, the spread of the flame can be stopped by reducing the temperature of the burning substance below its ignition point. When the flame passes.

Many of the tiny channels of the flame retardant element will then turn into a number of tiny flames. When designing the flame retardant elements inside the flame arrester, the contact area between the fine flame and the channel wall is maximized, and the heat transfer is strengthened, so that the flame temperature is reduced below the ignition point, so as to prevent the flame from spreading. The flame passes through the tiny channels of the fire-retardant elements and cools down within the channels.

When the flame is divided to a certain extent, the heat removed through the channel is enough to reduce the temperature below the ignition point of the combustible material and extinguish the flame. Or explained by the wall effect, when the channel is narrow to a certain extent, the collision between free radicals and the pipe wall is dominant, the free radicals are greatly reduced, and the combustion reaction cannot continue. Therefore, put under certain conditions (0.

1 MPa, 20) is defined as the "maximum experimental safe gap" (MESG) channel size that is just enough to extinguish the flame. The channel size of the flame arrestant element is a key factor in determining the performance of the flame arrester, and different gases have different MESG values. Therefore, when choosing a flame arrester, its MESG value should be determined according to the composition of the combustible gas.

In the specific selection, the gas is divided into several grades according to the MESG value. At present, two types of methods are often used internationally. One is the classification of the National Electrical Association (NEC), which classifies gases into four grades (A, B, C, D) according to their MESG value; The other is the International Electrotechnical Association (IEC) method, which also classifies gases into four classes (IIC, IIB, IIA and I).

Table 1 shows the MESG values and test gases for each type of gas classified by the two standards.

Table 1 Two MESG classification criteria.

NEC IEC MESG MM test gas.

a iic 0.25 acetylene.

b iic 0.28 Hydrogen.

c iib 0.65 ethylene.

d iia 0.90 propylene.

g m i 1.12 Methane.

In this way, when selecting a flame arrester, the grade of the combustible gas used can be found out first in the specification specified in the design, and then the corresponding flame arresting element can be selected according to the MESG value corresponding to the group of gases.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The flame arrester is a safety device used to prevent the flame spread of flammable gas and flammable liquid vapor Its working principle is: when the flame passes through the narrow pores, the flame can not continue due to the sudden increase in heat loss, so that the combustion can not continue and extinguish.

1. The function of the flame arrester is to prevent the open flame of the fire or constant light from entering the fuel gas system, causing a combustion accident.

2. It is generally installed in the pipeline for transporting combustible gas, or on the ventilated tank, and the device that prevents the spread of flame (deflagration or detonation) from passing through, which is composed of a flame retardant core, a flame arrester shell and accessories.

3. There are two main working principles of flame arresters: one is based on heat transfer, and the other is based on the wall effect.

Pipeline flame arrester, also known as fire arrester, the function of flame arrester is to prevent external flames from escaping into equipment and pipelines containing flammable and explosive gases or to prevent flames from spreading between equipment and pipelines. Flame arresters are designed and manufactured by applying the principle that when the flame passes through the narrow pores of the thermal conductor, it is extinguished due to heat loss. The flame arrester structure of the flame arrester is gravel, wire mesh or corrugated.

It is suitable for combustible gas pipelines, such as gasoline, kerosene, light diesel oil, benzene, toluene, ** and other oil storage and irrigation or flare systems, gas purification and ventilation systems, gas analysis systems, coal mine emission systems, heating furnace fuel gas pipeline networks, and can also be used in acetylene, oxygen, nitrogen pipeline supplies. This valve can be used in conjunction with a breathing valve or as a stand-alone valve. This type of valve should generally be installed horizontally or vertically in the pipeline according to the working conditions.

Main performance of pipeline flame arrester.

1. The explosion-proof performance is qualified, and the 13 consecutive explosion-proof performance tests can be fire-resistant each time.

2. The burn-resistance performance is qualified, and there is no tempering phenomenon in the burn-resistance test for 1 hour.

3. The shell hydrostatic test is qualified. This product has reasonable structure, light weight and corrosion resistance. Easy to access and easy to install. The flame arrester core is made of stainless steel, which is corrosion-resistant and easy to clean.

The piment function of the flame arrester is: to prevent the furnace fire from backing along the fuel gas pipeline and causing the attack fire of the fuel gas system, ** and other accidents.

The principle of the flame arrester is: the flame arrester is filled with brass metal mesh, when the flame enters the flame retardant flame informant, the metal mesh has high thermal conductivity, heat absorption and dispersion of heat, so that the temperature is reduced, the flame is extinguished, and the fire arrester plays a role in fire retardation.