Dust removal framework: design standards and installation precautions
Mar 13,2026
The dust removal skeleton is the core supporting component of the bag filter, mainly used to fix the filter bag, ensure smooth airflow, prevent the filter bag from collapsing and being damaged, and directly determine the service life and dust removal efficiency of the filter bag. For foreign trade factories, following standardized design and controlling installation details can not only meet export environmental compliance requirements, but also reduce equipment operation and maintenance losses.
1、 Core Design Standards for Dust Removal Skeleton
There is no unified template for the design of the dust removal framework, but it needs to fit the working conditions and match the filter bag specifications. The core follows the following hard standards to ensure stability and durability:
1. Size matching standard: The outer diameter of the skeleton should be 1-3mm smaller than the inner diameter of the filter bag, and the length should be precisely aligned with the filter bag, with an error controlled within ± 5mm, to ensure smooth insertion of the filter bag and avoid excessive clearance that may cause dust to escape; The spacing between vertical bars should be ≤ 30mm, and the spacing between rings should be adjusted according to the working conditions. The conventional spacing is 150-250mm. For high negative pressure working conditions, rings should be densified to prevent deformation of the skeleton.
2. Material selection criteria: Galvanized and spray coated carbon steel skeleton is selected for normal temperature conditions (≤ 130 ℃), with high cost-effectiveness and strong rust resistance; 304 stainless steel frame is selected for medium and high temperature conditions (130-260 ℃), and 316L stainless steel is upgraded for special corrosion conditions to prevent high-temperature deformation and acid-base corrosion; It is strictly prohibited to use thin iron sheets and inferior steel to avoid short-term cracking and deformation.
3. Structural process standards: The overall use of spot welding full welding process, the welding points are firm without virtual welding, leakage welding, burrs, weld beads, sharp edges and corners, to prevent scratching of the filter bag; The top is equipped with a Wen tube (injection tube) to optimize the distribution of dust cleaning airflow and improve the pulse dust cleaning effect; Smooth closure at the bottom to avoid scratching the filter bag and reduce airflow resistance.
4. Strength and load-bearing standards: The number of vertical bars in the skeleton should be adjusted according to the length and negative pressure value. For long bags with a length exceeding 3 meters, the number of vertical bars should be increased to ensure axial compression resistance and radial deformation resistance, withstand the weight of filter bag dust accumulation and equipment negative pressure suction, and operate without shaking or bending.
2、 Precautions for on-site installation
Installation errors are the main cause of skeleton damage and filter bag damage. During the actual operation process, it is necessary to strictly control the details and follow the standardized procedures:
1. Pre inspection first: Before installation, check the skeleton one by one to eliminate defective products such as deformation, cracking, excessive burrs, and coating peeling; Check whether the specifications of the skeleton are consistent with the size of the filter bag and flower plate holes to avoid model mismatch; Clean up debris and welding slag inside the flower plate holes to ensure smooth and regular hole positions.
2. Bagging and installation specifications: Smooth the filter bag into the frame, strictly prohibit pulling or twisting the filter bag with brute force, and prevent damage to the filter bag fibers; The end of the skeleton with a Venturi tube facing upwards is vertically inserted into the flower plate hole, ensuring that the bottom is not suspended and the top is tightly clamped to ensure sealing and prevent airflow short circuits; When installing multiple rows of skeletons, maintain even spacing and avoid touching each other.
3. Avoid external damage: During installation, handle with care and do not smash or step on the skeleton to prevent deformation of vertical bars and detachment of welding points; Take protective measures during high-altitude operations to prevent the skeleton from falling and colliding; The ash cleaning system is synchronized with the skeleton for debugging, ensuring that the pulse jet is aligned with the center of the Venturi tube to avoid airflow deviation and impact on the skeleton.
4. Post installation debugging and maintenance: After installation, check the fit between the filter bag and the skeleton, as well as the sealing of the flower board; Run the equipment without load, observe whether the skeleton shakes or makes abnormal noises, and check for air leakage problems; Regularly inspect the condition of the skeleton, and replace it promptly if any deformation, rust, or detachment is found to avoid damage to the filter bag.
3、 Additional adaptation points for foreign trade factories
For export-oriented dust removal equipment, the skeleton design and installation should also comply with the working conditions standards of the destination country: priority should be given to using environmentally friendly and odorless spray coating, and food grade stainless steel materials should be selected for food and pharmaceutical working conditions; Prepare anti rust and moisture-proof packaging to cope with the humidity environment during ocean transportation; Retain material inspection reports and size specification sheets to meet the inspection and compliance verification needs of overseas customers.
In summary, the dust removal framework may seem simple in structure, but it is the "invisible support" of bag filters. Standard design and standardized installation are the key to extending the life of filter bags and ensuring dust removal stability. Only by controlling the details in place can faults be reduced and long-term operation and maintenance costs be lowered.
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