The heat transfer oil heater is also called the heat transfer oil temperature controller, the hot oil temperature control device, the oil heating temperature control machine, the heat transfer oil electric heater, and is a large hot oil temperature control device, which can heat the heat transfer oil at a lower operating pressure. Heated to 350 degrees Celsius, the pump flow is large, and the heating power is high. The heat transfer oil heater is fueled by coal, heavy oil, light oil flammable gas and other combustible materials, and the heat transfer oil is a heat carrier. The circulating oil pump is used to force the liquid phase to circulate, and the heat energy is transferred to the heating equipment, and then returned to the reheated DC type special industrial furnace.
The heat transfer oil heater needs to take into account the installation quality, the system performance and the familiarity with the operation. The whole commissioning work can be divided into two steps: cold and hot.
1. Cold state debugging:
1 purpose:
Check that the operation of each unit is normal or not.
Check if the system is running normally under cold conditions.
Familiar with the operation and master the operation essentials.
2 requirements:
All motors are turned correctly, the equipment load is normal, and the operation is correct for continuous operation for more than 2 hours.
The circulating oil pump should be cold-tested before the hydrostatic test.
Make a record of the commissioning operation and eliminate any possible faults in time. Do all the preparations before commissioning.
3 cold state debugging steps:
Check that all equipment and piping installations meet the drawing requirements.
Check if the system pressure test flush meets the requirements.
Check that the electrical system and control instrument are installed.
The hot oil pump bearing housing and other transmission mechanisms are filled with running oil or grease as required.
Test each machine in a single machine to check whether the running direction is correct and the sound is normal.
Adjust the various valves of the system to prepare for oiling and commissioning.
The oil filling pump fills the high expansion tank.
Start the hot oil circulation pump.
Observe the hot oil circulation pump inlet and outlet pressure, furnace body pressure drop and inlet and outlet oil temperature, exhaust gas temperature and other instruments to see if the work is normal.
The cold state is running for more than four hours. If there is no abnormality, the hot state can be debugged.
2. Hot state debugging
Hot-state commissioning should include operational operations including thermal equipment, as described in Table 1.
(1). Initial heating stage:
Start the hot oil circulation pump and ignite the furnace. After the furnace was ignited, the temperature was raised at a rate of temperature increase of 10 ° C / hour. Until 90 ~ 95 ° C. Due to the high viscosity of the oil in the cold furnace, the flow velocity in the heating surface tube is low, the oil film on the pipe wall is thick, and the heat transfer conditions are poor, so that the local oil film temperature is too high.
(2). Dehydration stage:
In the range of 90-110 °C, it is the stage of repelling the residual moisture in the system and the trace moisture contained in the organic heat carrier. The heating rate is controlled in the range of 0 to 5 ° C / hour, and the length of this time depends on the dehydration. When the high-level expansion tank venting tube has a large displacement, the bottom has a water hammer, the pipeline vibration is intensified, and the pressure gauge pointer swings everywhere. The temperature must be stopped, the temperature is kept constant, and if necessary, the furnace door can be opened to reduce the combustion.
The length of this stage depends on the amount of residual water and the quality of the heat carrier. Never accelerate the rate of dehydration by heating, because once the water in the system evaporates and vaporizes, the volume will expand by more than 1000 times, causing not only “bumpingâ€, but also causing the oil level to expand rapidly and causing a large number of injections, and it may cause the pressure component to rupture and cause an accident. .
(3). Reheating stage:
When the sound is reduced in the organic heat carrier furnace and the pipeline, the hot oil circulation pump no longer appears to be evacuated (the pump outlet pressure drops below 0.1 MPa, there is heavy gasping sound), and the temperature can be raised again at 5 ° C / hour, but Do not exceed 120 ° C until the vent tube is not removed.
(4). Delighting component (degassing) stage:
After the dehydration process is completed, the temperature is raised again at a rate of 30 ° C / hour, but it should be noted that there may be residual water evaporation, and the temperature is stopped at any time. When the temperature reaches 210 to 230 ° C, it is stopped, and the light components in the heat carrier are mainly removed. The light components in the heat carrier that is heated in the liquid phase are present in the gas phase, causing "gas resistance" to cause the pressure of the hot oil circulation pump to be unstable, and the flow rate to be lowered or interrupted.
The length of the light-removing component process depends on the quality of the residual heat carrier. When the venting tube is not exhausted, the pressure of the hot oil circulating pump is stable, that is, it can be heated again at a speed of 0 to 10 ° C / hour.
(5). Reheating stage:
From 210 until the heat carrier operating temperature is reheated at a rate of 40 ° C / hr after the end of degassing, then the indications and actions of each test instrument should be thoroughly investigated to be sensitive and accurate. Whether the auxiliary auxiliary equipment and auxiliary equipment work normally. Thoroughly check that the heat carrier furnace and the entire heating system are working properly.
3. Note:
1. When the pressure difference is unstable, it should not be put into use.
2. When the oil temperature is reduced to below 80 °C when the furnace is shut down, the hot oil circulation pump can be stopped.
3. Make sure that the heat transfer oil circulates well at high temperatures.
4. During normal operation, the heat transfer oil in the high tank maintains a high liquid level, and the heat transfer oil in the oil storage tank should be at a low liquid level.
5. Oil should be injected into each mechanical lubrication point as specified.
6. The oil temperature must not exceed the allowable operating temperature of the heat transfer oil.
7. Different types of heat transfer oils are generally not allowed to be mixed.
8. The furnace ignition must be started after the hot oil circulation pump is turned on.
9. The moisture removed during the ignition temperature rises into the expansion tank through the expansion tube in the form of water vapor, one part of which is discharged from the evacuation tube by gas, and the other part is condensed into water and sinks into the bottom of the tank, so as to prevent this part of moisture from entering the circulation system again, During the heating process, the sewage pipe at the bottom of the expansion tank should be opened periodically to release the condensed water.
10. When the heat carrier is heated above 200 °C, the heat carrier furnace and the entire heating system should be thoroughly inspected, and all the coupling bolts should be heat-tightened to eliminate leakage caused by uneven expansion.
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