Thermal oil heater cold commissioning and hot debugging steps
The heat conduction oil heater is also called the heat conduction oil temperature controller, the hot oil temperature control equipment, the oil heating temperature control device, the heat conduction oil electric heater, and is a large-scale hot oil temperature control device capable of operating the heat conduction oil under a lower operating pressure. Heated to 350 degrees Celsius, pumping flow, high heating power. The thermal oil heater is based on coal, heavy oil, light oil combustible gas and other combustible materials. The thermal oil is the heat carrier. The circulating oil pump is used to force the liquid-phase circulation to transfer the heat energy to the heating equipment and then return to the reheated DC-type special industrial furnace.
When the heat conduction oil heater is being debugged, it needs to take into account the installation quality, the system performance and familiarity with the essentials of these operations. The entire debugging work can be divided into two steps: cold state and hot state.
1. Cold debugging:
1 purpose:
Check the normal operation of each unit's equipment.
Check that the system is operating normally or not under cold conditions.
Familiarize yourself with and master operating procedures.
2 requirements:
All motors are correctly steered, the equipment load is normal, and the operation is correct and continuous for more than 2 hours.
The circulating oil pump should be cold-tested before the hydrostatic pressure test.
Make a good record of commissioning operations and eliminate possible malfunctions in time. Do all the preparatory work before commissioning.
3 cold debugging steps:
Check whether all equipment and pipeline installation meet the requirements of the drawings.
Check whether the system pressure purging meets the requirements.
Check the electrical system and control instrument are installed.
Hot oil pump bearing boxes and other transmission mechanisms are injecting clean oil or grease as required.
Each unit is commissioned by a single machine to check if the direction of operation is correct and the sound is normal.
Adjust each valve of the system to prepare for oil injection and test run.
The fuel injection pump fills the high expansion tank.
Start hot oil circulation pump.
Observe the inlet and outlet pressures of the hot oil circulation pump, the pressure drop of the furnace body, the temperature of the import and export oil, and the working display of the exhaust temperature and other instruments are normal.
Cold running for more than four consecutive hours, if there is no abnormal phenomenon, can be hot state debugging.
2. Hot debugging
Hot-state commissioning should include operations using thermal equipment. Please follow the instructions in Table 1.
(1). Initial warming stage:
The hot oil circulation pump is started and the cold stove is ignited. After the cold furnace is ignited, the temperature is raised at a rate of temperature increase of 10°C/hour. Until 90 ~ 95 °C. Due to the large viscosity of the oil in the cold furnace, the flow velocity in the heated surface is relatively low, the oil film on the wall is thick, and the heat transfer conditions are poor, making it easy to make the local oil film temperature too high.
(2). Dehydration stage:
In the range of 90 to 110°C, the residual water in the system and the trace amount of moisture contained in the organic heat carrier are driven. The heating rate is controlled within the range of 0 to 5°C/hour. The length of time depends on the dehydration conditions. When the high expansion tank has a large displacement at the emptying pipe, there is a water hammer sound at the bottom, the pipeline vibration is aggravated, and the gauges of the pressure gauges in the various locations are relatively large. Must stop heating, maintain a constant temperature, if necessary, can open the door to weaken the combustion.
The length of this stage depends on the amount of residual water and the quality of the heat carrier. Must not blindly speed up the rate of dehydration, because once the water in the system evaporates violently, the volume will expand more than 1,000 times, not only cause "boiling", so that the oil level rapid expansion of a lot of spouting, and may cause rupture of the pressure element into an accident .
(3). Reheating stage:
When the organic heat carrier furnace and the sound in the pipeline become smaller and the hot oil circulation pump no longer exhibits evacuation (the pump outlet pressure drops below 0.1 MPa and there is a heavy gasping sound), the temperature can be raised again at 5°C/hr, but Do not exceed 120°C until the vent tube is not vented.
(4). Light off component (degassing) stage:
After the dehydration process is completed, the temperature is increased again at a rate of 30°C/hour. However, it should be noted that there may be residual moisture evaporation and the temperature may be stopped at any time. When the temperature reaches 210 to 230 °C to stop, then remove the light components of the heat carrier. The presence of light components in the liquid phase heating heat carrier in the gas phase can cause "air lock" to destabilize the hot oil circulation pump and reduce or interrupt the flow.
The length of the light-off component process depends on the quality of the residual heat carrier. When the vent tube is not vented, the pressure of the hot oil circulation pump is stable, ie, the temperature can be increased again by 0 to 10°C/hour.
(5). Reheating stage:
From 210 until the operating temperature of the heat carrier is reheated at the rate of 40°C/hr after the degassing is completed. At this time, it is necessary to comprehensively examine whether the indications and actions of the respective measuring instruments are sensitive and accurate. Whether the supporting auxiliary machines and auxiliary equipment work properly. A thorough inspection of the heat carrier furnace and the entire heating system is working properly.
3. Note:
1. When the pressure difference is unstable, it must not be put into use.
2. When the furnace is shut down, the hot oil circulation pump can be stopped when the oil temperature should fall below 80°C.
3. Make sure the heat transfer oil is well-circulated during high temperatures.
4. In 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 in a low liquid level.
5. Lubricate the mechanical lubrication points as required.
6. The oil temperature must not exceed the allowable working temperature of the heat transfer oil.
7. Heat transfer oils of different types must not be mixed.
8. The ignition of the cold furnace must be started with a hot oil circulation pump before ignition.
9. The moisture removed during the ignition and heating process enters the expansion tank through the expansion tube in the form of water vapor. A part of the water is discharged from the emptying tube by gas, and the other part is condensed into water and sinks into the bottom of the tank. This part of water must be prevented from entering the circulation system again. During the heating process, the drain pipe at the bottom of the expansion tank should be opened periodically to discharge the condensate.
10. When the heat carrier temperature rises above 200°C, the heat carrier furnace and the entire heating system shall be thoroughly inspected, and all the connecting bolts shall be thermally tightened to eliminate leakage due to uneven expansion.
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