The reason why the ordinary pipeline filter used in the titanium dioxide production line is prone to failure.
The unreasonable structure causes large material resistance, complicated slag discharge and cleaning operations, and the ordinary stainless steel used has low strength and is easy to corrode.
In view of these reasons and defects, a new type of pipeline filter suitable for titanium dioxide production was developed.
After being put into use, the operation is simple and flexible, high-efficiency and energy-saving, and the cost is reduced, which improves the product quality.
The pipeline filter is mainly composed of a nozzle, a cylinder, a filter element and fasteners. It can be installed on the fluid material conveying pipeline to remove larger solid impurities in the fluid material. Make the machine equipment and instruments work normally, reduce the material blockage failure, achieve a stable process, and ensure the role of safe production. Pipeline filters are widely used in titanium dioxide production lines, which have an important impact on the quality of the final chemical product - titanium dioxide. Ordinary pipeline filter operators have high labor intensity, frequent failures, difficult maintenance and high costs, which affect the filtration quality and output of fluid materials in the production of titanium dioxide.
Defects and Analysis of Ordinary Pipeline Filters
The structure principle of the ordinary pipe filter is shown in Figure 1.
Statistical analysis of the failures of common pipeline filters shows that in the process of material filtration, there are three main defects in the use of outsourced pipeline filters:
- The feed pipe and the discharge pipe are at the same height, and the flow direction of the material during the filtration process has three 90° turns respectively.
This kind of design cannot adapt to the characteristics of titanium dioxide production fluid material containing relatively coarse and large amount of impurity residue and flocculent viscosity of fluid material.
The filtration rate is slow, the filtration pressure drop is large, the filter element is easily damaged, and the fine titanium dioxide particles are easily deposited in the filter element together with the filtered impurities and residues.
Or deposited on the inner wall of the filter and the outlet pipe after passing through the filter element, causing blockage of the inner wall and the outlet pipe, affecting the yield and quality of the filtered material.
- The slag discharge and cleaning operations are complicated.
Slag removal and cleaning operations require unscrewing the top cover plate of the in-line filter.
After the filter element is taken out, the impurities and residues in the filter element can be cleaned, and the filter element is installed into the filter after cleaning.
It is necessary to tighten the screws of the top sealing plate of the pipeline filter, and the whole slag discharge and cleaning time is long and labor-intensive.
- The whole is made of ordinary stainless steel, and its strength is lower than that of ordinary steel.
In particular, the filter element and the filter element support device of the filter element are difficult to bear the weight of the pipeline material and the deposited impurity residue due to their low strength.
And it is not resistant to the filtration of high-temperature titanium dioxide materials at about 100 ℃, which makes the filter element and the filter element support device easy to deform and crack.
Maintenance is difficult, frequent maintenance, and high maintenance costs.
High temperature and strong acid fluid materials that cannot be adapted to titanium dioxide production process.
Principle and Application of New Type Pipeline Filter
In view of the defects of ordinary pipeline filters, the company has developed a new type of pipeline filter.
It mainly includes a wedge wire filter element, a filter cylinder, and a slag discharge device, which are sequentially connected by hexagonal screws from top to bottom.
The new pipeline filter can theoretically reduce the frequency of slag discharge and cleaning and the frequency of maintenance and scrapping of the originally purchased pipeline filter.
Improve filtration efficiency, reduce labor intensity and reduce costs.
The structure principle is shown in Figure 2.
Features Of The Wedge Wire Pipe Filter
- The new pipeline filter makes the material flow from the inlet to the outlet of the entire filter channel with only one 90° turn.
It overcomes the defect that the feed pipe and the discharge pipe of the original purchased pipeline filter are at the same height, and the flow direction of the material during the filtration process has three 90° turns respectively, the filtration rate increases, and the filtration pressure decreases.
Reduce the wear of the filter element, avoid the deposition and blockage of fine titanium dioxide particles in the filter element, the inner wall of the filter and the outlet pipe, and improve the yield and quality of the filtered material.
The structure principle of feeding and discharging is as follows:
The upper end is connected to the feed pipe, the side vertical 90° opening is connected to the discharge pipe, and the lower end of the pipe filter is the filter residue outlet.
The filter element is composed of a wedge wire filter element with a continuous unsealing structure designed according to the filtering flow and the particle size of the filter medium, and two upper end face flanges and intermediate flanges located on the upper part of the cylindrical core body.
The upper end face flange of the filter element is connected with the feed pipe through the feed pipe flange.
The upper end of the filter cylinder body is fastened with the intermediate flange.
The filter cylinder body includes a cylinder and a first connecting flange and a second connecting flange respectively located at the 2 ends of the cylinder, and a hole is opened in the center of the side wall of the cylinder.
The outlet connecting flange at the opening and the cylinder are connected by a round pipe, and the first connecting flange of the filter cylinder body is connected with the middle flange of the filter core body by hexagonal screws.
The outlet connection flange of the filter cylinder is connected with the discharge pipe through the discharge pipe flange.
- The slag discharge and cleaning operations are more convenient and easy to operate.
The lower end is the filter residue outlet, and there is a residue tank below the filter residue outlet.
The slag discharge device includes a tubular short connection at one end for supporting and fixing the filter element, an upper connecting flange located at the upper part of the tubular short connection, a lower connecting flange located at the lower end of the tubular short connection, and a ball valve.
The upper connecting flange and the second connecting flange at the lower end of the filter cylinder are connected by hexagonal screws, and the lower connecting flange and the ball valve are fixedly connected by hexagonal screws.
The outer diameter of the uppermost part of the tubular short connection is the same as the inner diameter of the lower end of the circular tubular core body of the filter core body, and the uppermost part of the tubular short connection is inserted into the circular tubular core body for supporting and fixing the filter core body.
A residue tank is arranged below the ball valve, and a filter bracket is also arranged below the upper connecting flange.
Compared with the original outsourcing pipeline filter, the slag discharge and cleaning operations of the new pipeline filter are simpler and more flexible, and it also has the ability to backwash.
The slag can be discharged at any time by switching the slag discharge ball valve without assembly and disassembly, and without stopping the pipeline material transportation.
Under the condition that the pipeline material transportation is stopped but the pipeline filter does not need to be installed or disassembled, the cleaning operation can be realized by reversely cleaning the various components from the slag discharge port with water, which reduces the labor intensity and saves the operation time, which has high advantages.
In addition, the feeding, filtering and slag discharge channels are designed and assembled in a straight line without changing the labyrinth, which effectively protects the accessories on the equipment pipeline from wear and blockage, and is highly efficient and energy-saving.
The new pipeline filter is put into the titanium dioxide production line, which is more simple and flexible to operate, efficient, and energy-saving and the cost is greatly reduced compared with the originally purchased pipeline filter.
The related costs saved each year can be more than 2/3 less than that of using ordinary pipeline filters, and the product quality is also improved.