Reduce Heat Loss Of Rotary Dryer

According to the development prospect of non-woven enterprises and the implementation of national energy conservation and consumption reduction policy, the high efficiency and energy saving dryer has become the trend of development, and will gradually replace the dryer with low output, high energy consumption and high production cost. Therefore, the QC design team of the Heng Tian heavy industry technology development center optimizes the structure of the rotary dryer and further reduces its heat loss according to the company's production technology and user's usage.

Goal setting: QC The team members communicated with the users' manufacturers, and made detailed measurements of the temperature of the equipment in different locations, and understood the problem that the drying temperature of the rotary screen dryer was too high at the user's production site. After investigation, it was found that the vicinity of the equipment valve and the inner plate and the panel were the areas with the highest popular temperature and the largest heat loss. The QC group sets the target value and reduces the hot surface temperature to about 35 degrees based on the existing W2728 series rotary dryer. Heat loss 。

Feasibility analysis: foreign textile machinery manufacturers FLEISSNER the same type of rotary dryer has reached 32.2 degrees centigrade, so there is much room for reducing the temperature of the popular surface. The group is led by a number of experienced senior engineers. The overall quality of the team is strong and the ability to research is strong. This is an important guarantee for the completion of this research goal.

The cause analysis is made by group members discussing and drawing correlation diagrams. Rotary dryer There are two main factors around the valve, which are too high temperature and too much heat loss at the connection of the inner plate and the panel. The conclusion is that 5 end factors are: the insulation layer is not filled tightly, the inner panel is directly contacted, the valve structure is not reasonable, the sealing strip material is not suitable, and the sealant is not smeared evenly.

After the group members' verification of the end factors one by one, the following 2 main reasons were identified: the direct contact of the inner panel and the unreasonable structure of the valve pressing.

The implementation of countermeasures: according to the two main reasons for confirmation, the group formulates corresponding countermeasures, puts forward improvement measures, sets specific targets, implements corresponding responsibilities and stipulates the completion time and place.

Aiming at the direct contact of the inner panel, the group proposes to add heat insulation facilities between the inner panel and the panel, increase the heat insulation strip, isolate the inner panel, increase the heat insulation card, and wrap the edge of the panel to achieve the goal of lowering the temperature of the panel to 35 degrees. In view of the unreasonable pressure of valve structure, the group changed the valve handle to bolt connection by increasing the tightening degree of the valve, and then welded the nut inside the inner plate. After the aging of the sealing strip, it could still be pressed through the bolt to avoid air leakage.

In 2013, the company collected the test data of new equipment for users. The hot surface temperature was evenly distributed from 45.6 degrees to 33.3 degrees. There was no leakage of air around the valve. The result was remarkable and achieved the expected goal.

Benefit: because of the high temperature of the front dryer and the lack of pressure on the valve, the sealing strip is easy to be aged and the handle of the valve is easy to damage. The company should provide a large number of spare parts for users every year, and send technicians to repair it, resulting in a lot of manpower and financial losses.

After tackling the problem, the average value of spare parts per unit was 1300 yuan, and the maintenance staff spent 1000 yuan, totaling 2300 yuan.

The energy consumption of a user in Jiangxi was tracked and the consumption of 1000 tons of non-woven natural gas was calculated. Before the user consumes 85 cubic meters of natural gas per ton of non-woven fabric, after the application is 82 cubic meters per ton, it saves 60750 yuan a year.