The silicon powder is used as a raw material, and the desired shape is first formed by a usual molding method, and preliminary nitriding is performed in a nitrogen gas at a high temperature of 1200 ° C, and a part of the silicon powder is reacted with nitrogen to form silicon nitride, and the entire billet is then formed. The body already has a certain strength. Then, a second nitriding is carried out in a high temperature furnace at 1350 ° C to 1450 ° C to form a silicon nitride. A silicon nitride having a theoretical density of 99% can be obtained by a hot press sintering method. Silicon Nitride Ceramic Rod,Silicon Nitride Ceramic Threads,Silicon Nitride Ceramic Shaft Rod,Industrial Silicon Nitride Ceramic Rod Dongguan Haikun New Material Co., Ltd. , https://www.hkceram.com
Pipeline gas transmission and distribution process
Pipeline Gas Transmission and Distribution Process
1. Gate Station Process:
Natural gas is typically transported under high pressure, and in some cases, it can exist in a liquid state due to the pressure and temperature conditions. To prevent freezing and ensure smooth operation, the high-pressure natural gas from the upstream source is first passed through a water heater. This heating process raises the temperature of the gas, reducing the risk of ice formation that could block valves or damage seals.
After being heated, the gas enters an oil separator, where it undergoes initial filtration. This step removes any light oils and impurities present in the gas stream, ensuring cleaner gas for further processing. The separated oil can be recovered for reuse or proper disposal.
Next, the purified gas is metered using a flow meter to determine the volume being transported. It then goes through secondary dehydration, deoiling, and dust removal processes to remove any remaining moisture or particulate matter. Once cleaned, the gas is sent to a pressure regulating device, which reduces the pressure from high to medium levels, preparing it for distribution to different areas.
The medium-pressure gas is then directed into a manifold system. Here, it is measured again by a flow meter before being odorized using an odorant injection system. Adding an odorant is essential for safety, as it allows for early detection of leaks. Once the gas meets national industrial standards, it is delivered to the municipal gas network for further distribution.
2. Municipal Transmission and Distribution Process:
Before connecting to individual districts, a valve well is installed on the branch lines within the community. This provides easy access for maintenance and emergency shutdowns, ensuring efficient management of the gas supply.
Before entering residential buildings, the gas must be reduced to low pressure. This is achieved through a building pressure regulator, which ensures safe and stable delivery to homes. The inlet of the pressure regulator is equipped with a quick shut-off valve, allowing immediate isolation of the gas supply in case of emergencies, such as leaks or equipment failure.
Once the gas is at low pressure, it passes through a household flow meter, which measures the amount consumed. The gas is then supplied to appliances like stoves, water heaters, or furnaces, where it is ignited for use.
This entire process ensures the safe, efficient, and reliable delivery of natural gas from the source to end users, maintaining quality and safety throughout the system.
(Source: Hebei Zhenxing Gas Regulator Co., Ltd. gas pressure regulator http://)
(Editor: Hardware Business Network Information Center http://news.chinawj.com.cn)