The
Sub-cylinder, also known as the sub-air bag, is widely used in petrochemical, power generation, steel, cement, construction and other industries, and is an indispensable auxiliary equipment for steam boilers.
Sub-cylinder performance structure
The sub-cylinder is the key supporting facility equipment of the heating furnace, which is used to distribute the steam that needs to be generated during the operation of the boiler to each pipeline. The main function of the sub-cylinder is to distribute steam, which is a high-pressure container, and the sub-cylinder is a pressure-bearing mechanical equipment. Therefore, the sub-cylinder is equipped with several high-pressure gate valves to connect the main steam valve and the steam gate valve of the heating furnace, so that the steam of the sub-cylinder can be distributed to the required places. The main pressure components of the sub-cylinder are: steam distribution valve seat, relief valve seat, pressure gauge valve seat and thermometer valve seat. Shell, head and flange material Q235-A/B, 20g, 16MnR, working pressure 1-2.5MPa, specification ф159-ф1500, working temperature 0-400℃, working medium is hot and cold water, steam and compressed air.
Sub-cylinder technical indicators
According to the design of the "Pressure Vessel Regulations", when the medium is steam, determine the material, thickness and diameter of the cylinder. Generally, it can be determined according to the flow rate of the fluid in the cylinder. The diameter of the cylinder should be 2-2.5 times the maximum diameter of the connecting pipe. 16MnR sheet should be rolled up, 10-20# seamless pipe, Q235B, 20g, the number of connecting pipes is determined by engineering design.
Equipment specifications: The specifications of the cylinders are DN200-DN1200, and the actual vessel capacity is determined by the customer. The design concept temperature is less than 350 ℃, the design concept working pressure is usually 1.43MPa, the working medium is steam, and the container type is a Class I high-pressure container.
sub-cylinder
1. Pressure and temperature parameters, supply flow.
2. Provide the number and diameter of steam inlet, outlet and drain pipes.
3. Whether the cylinder size is required.
4. Whether a thermometer, pressure gauge and safety valve are required.
Sub-cylinder features:
1. Standardized production, regardless of the size of the cylinder product, the annular seam is automatically welded.
2. Wide range of application, the maximum working pressure is 16mpa.
3. Each sub-cylinder is manufactured, tested and accepted in accordance with the national industry standards; after the sub-cylinder passes the factory inspection, the local quality and technical supervision bureau will conduct inspection and acceptance before leaving the factory to ensure the quality and safety of the sub-cylinder, and check the qualification of the sub-cylinder, etc. Certificate drawings.
4. It can be designed and manufactured according to the needs of users.
How to choose the sub-cylinder correctly
1. The design pressure meets the requirements, and then the selected cylinder material meets the requirements.
2. Look at the appearance. The appearance of the product reflects its grade and use value.
3. Look at the product nameplate. Whether the upper right corner of the nameplate is stamped with the seal of the supervision and inspection unit, and the nameplate shall indicate the name and production date of the supervision and inspection unit and the manufacturer.
