Project project:
The introduction of steam from the steam tube and the discharge of condensed water directly affect the efficiency of the dryer. The traditional steam tube rotary dryer or steam calciner has a steam drum at one end and the steam heat exchange tubes in the dryer are connected. The steam drum is steam-distributed and hydrophobic by a steam drum. The connection between the steam heat exchange tube and the steam drum is subject to inspections such as hydrostatic tests, which are generally carried out at the factory. It is more difficult to complete these tasks on site, that is, complete machine manufacturing, overall transportation, and overall installation are required at the factory. Due to the application and development of coal chemical industry, a large-scale steam tube rotary dryer is required. Due to the large volume of the equipment, heavy weight, and overall transportation, the overall installation is difficult. However, the existing steam tube rotary dryer is difficult to manufacture on site due to the actual structure.
In order to solve the problem of processing and manufacturing and on-site assembly of steam tube rotary dryer parts factory, the project has been carried out to study related technical solutions.
Project achievement:
1. The steam hydrophobic structure of the steam tube rotary dryer can solve the problems of processing, manufacturing and on-site assembly of the steam tube rotary dryer parts factory, thereby avoiding the problems of transportation, on-site installation and inspection;
2. The basic structure includes a heat exchange tube for the dryer, a nozzle, a circular loop tube, a connecting tube, a steam distribution package, a rotary joint, and an equal blocking plate;
3. The rotary joint is sealed and communicated with one end of the connecting pipe uniformly arranged on the circumference of the inserted steam drum by the rotating steam separator, and the other section is connected with the circular ring tube arranged in the radial direction; the arc of the circular ring tube The section is connected to the rotating dryer heat exchange tube through the take-over; each circular loop tube and the circumferentially arranged connecting pipe are arranged with an aliquot blocking plate;
4. The rotating sub-pack is provided with a fixed elbow, one end of the elbow is downward, and the other end of the elbow is connected to the condensate outlet pipe of the rotary joint through the steam separator;
5. The connecting pipe is composed of two arranged pipes, one end of the two arranged pipes is radially inserted into the steam drum for a length; the other connecting pipe is provided with a connecting hole corresponding to the circular ring pipe arranged in the radial direction;
6. The circular ring tube is concentric, and is provided with a communication hole corresponding to the connecting pipe uniformly arranged in the circumference; a plurality of connecting pipes are arranged on the arc segment of the circular ring pipe, and the connecting pipe is connected to the heat exchange tube of the dryer through the flange;
7. The rotary center end of the steam drum is provided with a rotary joint, the steam distribution package is arranged on the axial center of the rotary dryer end, and the split steam center line is concentric with the axial line of the rotary dryer end;
8. The working steps are as follows: the pressure steam sent from the pipeline enters the steam drum through the steam inlet of the rotary joint; the circular pipe arranged in the radial uniform arrangement is connected through the connecting pipe arranged uniformly on the circumference of the steam drum; The loop pipe introduces pressure steam into each heat exchange tube of the dryer through the nozzle; the indirect heat exchange between the heat exchange tube and the material of the dryer according to the concentric circle is evaporation and drying of the material; the pressure steam in the heat exchanger tube of the dryer is heated by the steam The steam is condensed into condensed water; the condensed water is discharged to the circular ring pipe, and each round ring pipe and the circumferentially arranged connecting pipe are arranged with an equal dividing plate, when located between the two equal dividing plates of the annular pipe When the segment is higher than the rotary axis of the dryer, the condensed water in the heat exchange tube reaches the connecting pipe; with the rotation of the steam drum, the condensed water in the connecting pipe flows into the steam distribution bag by gravity; the condensation in the steam drum The water is discharged from the condensate outlet of the rotary joint by steam pressure through a fixed elbow;
9. On-site assembly, each dryer heat exchange tube can be independently assembled and flanged to connect with water pressure test. The steam drum and round ring tube can be factory-made, assembled on site and welded in place; steam hydrophobic structure is completely externally placed. In addition to the cylinder, it is separated from the material and evaporated moisture, and can be installed, inspected, repaired and maintained outside the cylinder;
10. The overall structure is a parallel connection of a plurality of concentric circular heat exchanger tubes and a plurality of circular loop tubes arranged in a concentric circle, and the connection mode is through the nozzles and the flanges. Each of the plurality of circular loop tubes arranged in a concentric circle may be equally divided into six equal parts, seven equal parts or eight equal parts in the circumferential direction, and is equally divided by the blocking plate. Each segment of the circular ring tube is open at both ends and connected to the steam distribution bag through the nozzle. And a split steam package of the steam hydrophobic structure is installed on the axial center of the rotary dryer;
11. The overall structure has the following advantages: the complex steam drum structure manufactured by the factory is simplified into a pipe connection structure that can be constructed and inspected on site. Therefore, the steam tube rotary dryer is simplified from the whole factory manufacturing, transportation and installation to factory parts manufacturing, split transportation, on-site assembly; large-scale manufacture of steam tube rotary dryer can be realized to meet the demand of large processing capacity; Other parts such as steam heat exchange tubes can be inspected and replaced separately; the steam distribution and hydrophobic structure can be easily observed and maintained; the manufacturing cost and transportation cost are reduced.
