The structure
The flow characteristics of tubular oil cooler are oil passing through shell and water passing through pipe. The heat transfer coefficient of the oil side outside the pipe is 1/10-1/20 of that of the heat transfer coefficient inside the pipe, and the thermal resistance is mainly on the oil side.
Principle of
This equipment changes the traditional bow separator to the cyclone guide plate. The main principle is: the cooling oil passes through the shell of the oil cooler, and rotates along with the cyclone guide plate, and the oil is washed along the tube circumference while rotating. The structural parameters of the tube are the results of multiple comparative tests.
Product Features
Compared with other types of oil coolers, tubular oil coolers have the following advantages:
1, high heat transfer efficiency is 2-3 times that of plate oil cooler;
2, compact structure, its compactness for plate heat exchanger 1-2 times;
3. Small oil resistance: due to the use of cyclone guide plate, the oil enters the tangential flow, which is conducive to fluid operation;
4, long service life, convenient installation and detection: the heat exchange tube thermal expansion stress is small, so there is no common heat exchange tube expansion, leakage problems. Because it is still shell and tube structure, convenient installation and maintenance.
Selection of products
This product series is specially designed for condensing steam turbines and various heating steam turbines in thermal power plants. It can also be used for the lubrication of boilers, water pumps, coal mills and suction fans of power machinery in industrial and mining enterprises, and for the cooling of power oil.
Installation
1. Preparation before installation: the oil cooler shall be tested by 0.6mpa hydraulic pressure before leaving the factory. However, before installation, it should be carried out in accordance with the provisions of "Technical Specifications for Construction and Acceptance of Electric Power Construction" (Steam turbine) : "water pressure test of 1.5 times of working pressure should be carried out on the side of oil cooler, and no leakage should be kept for 5 minutes. If the wind pressure test is carried out, the pressure should be working pressure".
2. Installation of oil cooler: (1) the oil cooler is supported on the support prepared in advance, and can reliably meet its dynamic and static load requirements. (2) Because the support bow separator is changed to the cyclone guide plate, the oil inlet direction of the oil cooler is clockwise, do not install the reverse direction.
Tube cooler cleaning method is as follows:
1. Cleaning the water side of the tube cooler
a, trichloroethylene solution can be used for washing, so that the cleaning liquid in the cooler circulation flow, the solution pressure is not more than 0.63MPa, the flow direction of the solution is best opposite to the direction of the cooler oil flow. The cleaning time depends on the dirt condition. After rinsing, introduce clean water into the cleaning until the outgoing water is visually checked to be clean.
B. Carbon tetrachlor can also be used for soaking, pouring the solution into the cooler, and watching the color of the solution after 15 ~ 20 minutes. If it is seriously turbid, replace the new solution and repeat soaking until the color of the solution after soaking is similar to that of the clean solution, and then introduce clean water into cleaning until the water out of the water is clean after visual inspection.
C. If there is no obvious structure in the pipeline on the water side, it can be cleaned with the corresponding brush according to the caliber of the pipeline, and then rinsed with clean water.
2. Hydraulic test is carried out after cleaning the tube cooler. The interpipe cavity of the tubular cooler shall be tested for tightness with water according to its nominal pressure or 1.25 times the working pressure, and the pressure shall be maintained for 30 minutes. There shall be no leakage at the tube expansion or welding place. The water must be completely drained after the test.
3. Check the heat exchange effect of tube cooler. After the lubricating oil is cooled by the cooler, the general temperature can be reduced by 5 ~ 10℃, and the cooling water temperature can be increased by 3 ~ 5℃.
4. The connecting oil ports of the tubular cooler shall not be opened without reason during cleaning, and must be sealed with a bulkhead or flange cover.
