The most efficient way of catching fine dispersed dust out of outgoing gases and aspiration emissions of different technological processes and units is filtration. During this process gases go through the filtering fabric, which is a fabric with different characteristics.
Fabric filters are widely-spread in ferrous metallurgy and nonferrous metallurgy, in chemical and oil industry, in building material manufacture and other sectors of national economy.
In the enlarged view, the fabric filter is a metal body with the filtering elements inside consisting of fabric bags pulled on metal wire frameworks.
Pulse-jet blow by the compressed air through quick-operating blowing valves is used for regeneration of the filtering elements. Dust discharge can be carried out only through blinker units, rotary valves or through the system of pneumatic transport, which is manufactured and supplied at the customer’s order. It is also possible to set up the system of pneumatic caving or vibratory caving of dust, accumulated in the dust bunker, to avoid its hanging.
Company specialists are constantly working to improve the efficiency and reliability of machine operations, improve their construction and separated elements, using new filtering materials, which have a high dust-catching ability and are resistant to higher temperatures and influence of aggressive atmosphere. Suggested devices of cleaning gases are not inferior to foreign analogues, and by some characteristics even excel them, at the same time having lower cost.
The main differences of the fabric filters consist in means of regeneration, construction of the filtering elements (filter bags or cassettes), quantity of the sections in a filter, regimes of the carrying out the filtration and regeneration.
Efficiency of eliminating the dust from gases in the filter depends on dispersion ability of dust particles, characteristics of the filtering fabric, means and regime of regeneration, volume of specific gas and dust load, hydraulic resistance of the device.
Filters are equipped with a highly efficient and safe system of regeneration by compressed air with use of quick-operating blowing valves. Operation of the equipment is completely automatized.
The system of control and measuring instruments and automatics provides measurement of all necessary technological parameters and automated control of such systems as regeneration, dust unload, reduction of temperature at the entrance of the filter etc.
Bag house filters with pulse jet regeneration are used to clean waste gases and aspiration emissions from fine dispersed dust. The sphere of use of the filters can be any industry, the technology of which supposes creation of dust-loaded gases or air.
The filter consists of the body and mechanic equipment. The body is a bearing construction. It is divided into chambers of clean and dirty gas by horizontal partitions, that is, bag boards with holes for fixation of the filter bags. The filter bags are situated in the chamber of dirty gas. They have a one-side fixation, from the side of the chamber of dirty gas.
The upper part of the chamber of clean gas is equipped by replaceable covers, providing approach to bags during carrying out technical servicing. The chamber of dirty gas has one section without partitions.
The chamber of clean gas is divided into sections by vertical partitions according to the number of cut-off valves (in case of equipping the filter with cut-off valves). Entrance of clean gas is general.
The lower part of the filter body is made up by pyramidal or slatted hoppers, ending by flanges for installation of lock feeders or screw conveyors. At the custom’s wish, we can set up a system of pneumatic transport of the caught dust and a system of pneumatic dust caving, of dust collected in hopper.
Other requirements to the construction of the filter body are defined by the working documentation concerning the construction of the dust catching equipment. At that, during the design stage, it’s necessary to calculate tensile strength of the body of the filter, taking into account the filtration process as well as climatological and seismic load in the region of the building equipment and to correct the documentation for the manufacturing of the body and the covering of the filter (“shack”).
Mechanic equipment of the filter consists of: the system of regeneration of bags (compressed air collector, blowing valves and distributing headers), the bag boards, the filter bags, the wire frameworks, the cut-off valves, the pressure reduction spool of compressed air, the dust removing devices and the filter regeneration control box.
Bag house filters with pulse-jet regeneration with capacity of up to 30000 m3/h are equipped with the system of regeneration with blowing valves with nominal bore of 50 mm, filters with middle and big capacity (of more than 30000 m3/h) are equipped with valves with nominal bore of 70 mm. Regeneration of bags is carried out automatically after reaching the design value of the hydraulic resistance of the filter. It’s possible to carry out regeneration in a cyclic regime, that is through the given time intervals. The regimes of regeneration of bags with cut-off or without cut-off of the clean gas flow are indicated at installation of cut-off valves on the clean side of the filter, in the system of automated control.
As a filter fabric, a cloth with different physical characteristics made of both domestic and foreign manufacturers can be used. Its choice is specified by characteristics of the dust and gas flow, and first of all by the temperature regime of the filtration process.
The necessary pressure of compressed air for the work of the system of regeneration in the dust catching device is 0,4 - 0,5 MPa. The compressed air must be dried-up and cleaned-up not lower than the 10th class under the government standard 17433-80.
Standard size of the filter, type of fabric, its list of equipment of single order, equipment status and climatological performance are defined at the development of the working documentation of the gas cleaning equipment, only on the basis of the material requisition of the customer containing the whole information about the parameters of the dust and gas flow and dust characteristics.
In the catalogue there are basic technical characteristics of the equipment mentioned for the entry dust load of gases not more than 10 g/m3 and the temperature of the cleaned gases not higher than 135°С. Maximum recommended gas load on fabric for these
conditions is not more than 1,5 m3/m2 х min. In case of the difference of the real conditions of operation of the equipment from the specified conditions, it’s necessary to coordinate the setting-up of this or that standard size of the filter with the manufacturer.
Specialists of our enterprise are ready to consider any wishes of the customers connected with changes of constructive elements of the equipment and their use in non-standard technological processes. After receiving the material requisition, you will be offered an optimal gas cleaning system with use of the given or an alternative equipment. At signing the contract for the manufacturing of the filters we separately consider erection supervision work issues, setting up issues and after-sales service issues.
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