Chemical drawer type fluorine lined flame arrester

ZGBChemical drawer type fluorine lined flame arresterProduct Description

There are two main perspectives on the working principle of flame arresters: one is based on heat transfer; One is based on the wall effect. The flame arrester has a reasonable structure, light weight, corrosion resistance, and qualified explosion resistance performance. It has been tested for 13 consecutive subsonic flame tests and can block fire every time. Easy to maintain and install. The fire resistance performance is qualified, and there is no tempering phenomenon after 1 hour of fire resistance test. The flame arrester core is made of stainless steel material, which is corrosion-resistant and easy to clean. There is no leakage in the 2.4MPa hydrostatic test. This flame arrester is suitable for pipelines, Class A with a flash point below 28 ℃, oil products, hydrogen oxygen liquefaction products, and kerosene, diesel, methyl benzene crude oil with a flash point below 60 ℃, pipelines transporting flammable gases, torch series, oil and gas recovery systems, heating furnace fuel gas pipeline networks, gas purification and purification systems, gas analysis systems, and coal mine gas emission systems. Valve lining materials include synthetic rubber (-10-120 ℃), polytetrafluoroethylene PTEF (-200-180 ℃), soluble polytetrafluoroethylene PFA (-196-260 ℃), and polytetrafluoroethylene F46 (-85-150 ℃). The above are the maximum tolerance temperatures of various materials that are publicly available. The actual temperature of the medium used varies depending on the material and pressure. The long-term use temperature should usually be lower than the upper limit by about 30%. Otherwise, the lining of each component of the valve is prone to deformation, resulting in large leakage or valve failure to open and close normally.

The medium used should not contain hard particles, crystals, impurities, etc., in order to prevent wear and tear of the fluorine plastic lining or corrugated pipe during the opening and closing operation of the valve. For media with hard particles, crystals, and impurities, corrosion-resistant precious metal materials such as Hastelloy, nickel based alloys, alloy steel, and other hard sealed valves can be selected based on the characteristics of the process medium. Steel polytetrafluoroethylene composite pipes can resist corrosion from almost all chemical media, including concentrated nitric acid and aqua regia, except for molten metal lithium, potassium, sodium, oxygen trifluoride at high temperatures, and high flow rate liquid fluorine. They can work at temperatures of 230 ℃ -250 ℃ for a long time. Steel polyvinylidene fluoride or other polyvinylidene fluoride composite pipes have good corrosion resistance to halogens, halogenated hydrocarbons, strong oxidants, boiling acids, alkalis, and various organic solvents, but are not resistant to corrosion by fuming sulfuric acid, concentrated hot sulfuric acid and nitric acid, ketones, esters, amines above 90 ℃, and high-temperature sulfonating agents.

The main advantages of fluorine lined flame arresters are:

High temperature resistance - operating temperature up to 250 ℃

Low temperature resistance - with good mechanical toughness; Even if the temperature drops to -196 ℃, it can maintain a 5% elongation rate.

Corrosion resistance - exhibits inertness towards most chemicals and solvents, and can withstand strong acids, alkalis, water, and various organic solvents.

Climate resistance - has an aging life in plastics.

High lubrication - refers to the low coefficient of friction in solid materials.

Non adhesive - refers to the small surface tension in solid materials that does not adhere to any substance.

Non toxic - physiologically inert, non-toxic to living organisms.

The utility model discloses a pipeline system for transporting hydrochloric acid, comprising a pipeline body, corrugated pipes for connection, and fixing parts The pipeline body is divided into an outer layer of the pipeline body that can withstand external wear and tear and an inner lining of the pipeline body that is resistant to hydrochloric acid corrosion. The outer surfaces of both ends have pipeline body threads. The corrugated pipe is made of polytetrafluoroethylene material and has corrugated pipe threads on the inner surfaces of both ends. The fixing parts are two pieces of metal material connected by fixing bolts, and the inner surface of the inner diameter has inner gaskets for the fixing parts; Due to the use of corrugated pipes to connect pipelines, it is more convenient and flexible to install pipeline systems, and the fixing components can facilitate the fixation of pipelines on walls; The outer layer and fixing parts of the pipeline body are made of metal material, so they are not easily damaged by external environmental factors. When hydrochloric acid liquid flows through the pipeline system, it only comes into contact with the PTFE material of the pipeline body lining and corrugated pipe, making it less prone to corrosion and leakage Fire resistant breathable cap is an important accessory used in urban industrial and mining enterprises, gas stations, and installed on storage tanks (or small oil tanks with a pump delivery capacity of no more than 25m2/n for light oil products).

execution standard

1. GB13347-92 "Fire resistance performance and test methods of flame arresters for petroleum gas pipelines"

2. SH/T3413-99 "Selection, Inspection, and Acceptance of Fire Arresters for Petrochemical Petroleum Gas Pipeline"

3. HG/T20570.19-95 "Setting of Flame Arresters"

Heat transfer effect

One of the conditions required for combustion is to reach a certain temperature, which is the ignition point. Below the ignition point, the combustion will stop. According to this principle, as long as the temperature of the burning substance is lowered below its ignition point, the spread of flames can be prevented. When the flame passes through many small channels of the flame retardant element, it will turn into several small flames. When designing the flame retardant components inside the flame arrester, try to expand the contact area between the small flame and the channel wall as much as possible, enhance heat transfer, and lower the flame temperature below the ignition point, thereby preventing flame spread.

Wall effect

Combustion and explosion are not direct reactions between molecules, but are stimulated by external energy, which breaks the molecular bonds and produces activated molecules. The free radicals of activated molecules collide with other molecules to produce new products, while also generating new free radicals that continue to react with other molecules. When the combustible gas passes through the narrow channel of the flame retardant element, the collision probability 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 becomes 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 to propagate through the flame arrester.

As the size of the flame arrester channel decreases, the collision probability between free radicals and reaction molecules decreases, while the collision probability between free radicals and channel walls increases, which promotes a decrease in free radical reactions. When the channel size decreases to a certain value, this wall effect creates a condition where the flame cannot continue to propagate, and the flame is stopped. Therefore, the wall effect is the mechanism for preventing flames.

Execution standard:

Design Specification: GB5908-86

Testing and Inspection: GB1347-92

Flange connection: JB/T79, GB9112-9131, HG20592, SH3406, ANSI B16.5

Product identification: GB/T 12220

Supply Specification: JB/T 7928

ZGBChemical drawer type fluorine lined flame arresterPerformance indicators:

Main appearance and installation dimensions:

Technical Requirements:

① The explosion resistance performance is qualified, and it can block fire every time for thirteen consecutive tests;

② Qualified fire resistance, heat-resistant, and no tempering for 1 hour.

Maintenance and repair of drawer type flame arresters:

In order to ensure the safe use of flame arresters, they should be regularly inspected and maintained.

1. The flame arrester should be inspected every six months to check whether the flame arrester core is blocked, deformed, corroded, etc.

2. The blocked fire-resistant layer core should be cleaned thoroughly to ensure that each hole on the core is unobstructed, and any deformed or corroded fire-resistant layer should be replaced.

3. When reinstalling the fire-resistant layer core, it should be ensured that the joint surface is tight and there is no air leakage.

Operating parameters:

Product installation

1. Remove all protective covers from flanges and discard all packaging materials.

2. Check the valve seat and the matching flange gasket on the valve seat surface. It must be clean, flat, scratch free, corrosion-resistant, and have tool marks.

3. Check the gasket to ensure that the material is suitable for the application.

4. Lubricate all bolts and nuts with appropriate thread lubricant. If the fastener is made of high temperature or stainless steel material, use anti seize compounds such as molybdenum disulfide.

5. Internal gasket of bolt ring.

6. When setting up the flame arrester shell flange to connect with the pipeline flange, attention should be paid to the lifting handle and top nut position of the flame arrester element to facilitate the removal of flame arrester components in the future.

Ordering Notice:

1、 ① Product name and model ② Caliber ③ Is there any accessory for us to correctly select for you ④ Operating pressure ⑤ Temperature of the medium used.
2、 If the company's model has already been selected by the design unit, please order the model directly from our sales department.

3、 When the usage situation is very important or the environment is complex, please provide design drawings and detailed parameters as much as possible, and our valve company experts will review and control them for you. If you have any questions: Please: We will do our best to provide you with high-quality service. We provide comprehensive and professional "valve system solutions" and are also willing to help users solve problems encountered in production.