I. Design Objectives

The design of the bag filter housing should ensure efficient dust collection, meet the dust removal requirements of a specific industrial environment, and at the same time achieve a compact structure, easy maintenance, economy, and durability.

II. Determination of Design Parameters

① Treatment Air Volume:

Determine the gas flow rate to be treated based on the production process and on-site environment. This is a key parameter for determining the size of the housing.

② Dust Characteristics:

Understand the particle size distribution, concentration, viscosity, chemical composition, etc. of the dust. If the dust has a small particle size and high concentration, higher filtration accuracy is required.

③ Operating Temperature and Pressure:

Clarify the temperature and pressure range of the gas to select appropriate materials and determine the pressure and heat resistance performance of the housing. For example, the operating temperature is 80°C and the pressure is normal pressure.

III. Housing Structure Design

① Shape and Dimensions:

• Common shapes include cuboids and cylinders. Cuboids are convenient for installing and arranging filter bags, while cylinders have more advantages in withstanding pressure. Determine the dimensions according to the treatment air volume and space limitations.

• Consider the maintenance space. Sufficient passageways and operating space should be reserved inside the housing to facilitate the replacement of filter bags and equipment maintenance.

② Inlet and Outlet:

• The position of the inlet should ensure uniform distribution of the gas flow to each filter bag area. Devices such as gas flow distribution plates and guide vanes can be used.

• The design of the outlet should ensure the smooth discharge of the purified gas and avoid generating turbulence and resistance.

③ Ash Hopper:

• The ash hopper is located at the bottom of the housing and is used to collect the settled dust. The inclination angle of the ash hopper should be greater than the angle of repose of the dust to ensure the smooth sliding of the dust.

• The volume of the ash hopper is determined according to the dust production rate and the ash cleaning cycle, and it is necessary to ensure that the ash hopper will not overflow within the ash cleaning cycle.

IV. Material Selection

① Housing Shell:

Generally, Q235 carbon steel is selected, which has a low cost and sufficient strength. If the working environment is corrosive, stainless steel or carbon steel with surface anti-corrosion treatment can be used.

② Internal Components:

For internal components such as gas flow distribution plates and filter bag frames, materials such as galvanized carbon steel and stainless steel can be selected according to the actual situation to prevent rust from affecting the equipment performance.

V. Strength and Stability Calculation

① Pressure Calculation:

Calculate the pressure borne by each part of the housing according to the working pressure and possible pressure fluctuations to determine the thickness of the plate.

② Stability Analysis:

Conduct a mechanical analysis of the housing structure to ensure that no deformation or instability occurs during the working state. Finite element analysis software can be used to simulate the stress conditions of the housing under different working conditions and optimize the structural design.

VI. Sealing Design

① Housing Joints:

Use sealants or sealing strips for sealing to ensure that no gas leakage occurs. The joints can be welded or bolted, and sealing treatment is carried out after welding.

② Inspection Doors:

Inspection doors should be equipped with good sealing devices, such as rubber sealing strips, to ensure sealing when closed. At the same time, the opening of the inspection doors should be convenient and quick for daily maintenance.

VII. Design of Auxiliary Facilities

① Ash Cleaning System:

Common ash cleaning methods include pulse jet ash cleaning and mechanical vibration ash cleaning. Pulse jet ash cleaning has good effects and low energy consumption and is widely used. The design of the ash cleaning system should ensure the effective removal of dust on the filter bags without damaging the filter bags.

② Temperature Monitoring and Control:

Install temperature sensors to monitor the gas temperature inside the housing in real time. When the temperature is too high, cooling devices (such as air coolers and water spray cooling devices) can be used for cooling to prevent the filter bags from being damaged due to high temperature.

③ Pressure Monitoring:

Set up a pressure gauge to monitor the pressure difference between the inlet and outlet of the housing. When the pressure difference exceeds the set value, it prompts for ash cleaning or inspection of whether there is a blockage in the equipment.