The operation of the thermal oil heating system mainly includes preparation before driving, cold commissioning, hot commissioning, heating up, emergency handling of power outages, and shutdown of the furnace. The following is a detailed explanation of these operations:

1、 Preparation before driving

1. Check equipment and pipelines: Check whether each equipment and process pipeline is installed properly to ensure no leakage or damage.

2. Add lubricating oil: Add lubricating oil or grease to the operating equipment and transmission mechanism of the system as required to ensure smooth operation of the equipment.

3. Human resource preparation: Ensure that the relevant operators have received professional training and passed the assessment, and are familiar with the operating procedures and safety precautions of the thermal oil heating system.

2、 Cold state debugging

1. Oil injection and exhaust: Turn on the oil injection pump to inject oil into the high-level tank until the low-level tank does not sound an alarm. After turning off the oil injection pump, start the air-cooled hot oil pump to start the cold oil circulation, and open the high-level tank vent valve to continuously eliminate air. At the same time, timely supplement the heat transfer oil in the high-level tank to maintain a certain liquid level.

2. Cold oil circulation: The cold oil circulation time should not be less than 4 hours. Observe whether the inlet and outlet pressure of the oil circulation pump, as well as the system pressure gauge, temperature gauge and other instruments display normally. Until the pressure difference fluctuates and stabilizes, check that there are no leaks or blockages in the system. Clean the filter 2-3 times before conducting hot commissioning.

3、 Hot state debugging

1. Ignition and heating: Use non-metallic firewood evenly spread on the grate to ignite, and control the amount of combustion to keep the oil circulation pump from emptying. The oil heating rate is controlled at around 10 ℃/h. When the oil temperature rises to 70-80 ℃, the insulation cycle lasts for 36-48 hours to evenly dry the refractory materials in the furnace.

2. Coal loading and observation: Spread dry coal evenly into the furnace by hand, and gradually over load the coal with the coal hopper. Observe the combustion of the fire from the observation door to ensure stable combustion.

3. Dehydration and degassing: Dehydration and degassing operations shall be carried out according to the temperature curve requirements. The oil temperature should be controlled at around 105 ℃, and attention should be paid to observing the fluctuation of the pressure difference between the inlet and outlet of the circulating oil pump. If the circulating oil pump is empty, it can be stopped for 2-3 minutes and restarted. After the pressure difference fluctuation returns to normal, continue heating up to 120-150 ℃, with a focus on removing moisture and low volatile components from the oil. As the temperature rises above 200 ℃, thermal tightening operations can be performed at the system valve flange connection. Open all the low-level and high-level tank vent valves until there is a fluctuation in pressure difference and the direction becomes stable, and the exhaust is significantly reduced.

4、 Heating up

1. Control the heating rate: Control the heating rate at around 10 ℃/h, gradually raising the oil temperature to around 260 ℃.

2. Monitoring instruments: comprehensively control the normal display of each instrument to ensure the stable operation of the system. After normal use of the heating system, the surface temperature of the high-level groove must not exceed 70 ℃ (if there is an auxiliary exhaust valve, it must be closed after normal use).

5、 Emergency response to power outages

1. Hot and cold oil replacement: When the circulating oil pump cannot operate due to power outage, the heat transfer oil in the furnace coil will rapidly rise above the maximum allowable film temperature of the heat transfer oil, causing accelerated cracking and coking of the heat transfer oil. At this time, the hot and cold oil replacement valve should be quickly opened to replace the heat transfer oil from the high-level tank into the low-level tank through the furnace coil, and wet coal pressure ignition or steam pressure ignition should be carried out at the same time. This process should be completed within 5 minutes.

6、 Shutdown of furnace

1. Emergency shutdown: In case of emergency, the hot oil circulation pump must continue while stopping coal feeding and blowing, and the grate quickly sends out the red coal. If there is a power outage, use wet coal or steam ignition.

7、 Other precautions

1. Ensure sealing: When heating the thermal oil, ensure good sealing of the system to prevent oil and gas leakage from causing safety accidents.

2. Correct operation: Heating equipment should be operated correctly according to the operating instructions and equipped with reliable safety protection devices, such as over temperature protection, pressure protection, oil shortage protection, etc.

3. Regular maintenance: Regularly check the quality and heat transfer performance of the heat transfer oil, and replace sediment and oxides. Simultaneously inspect the corrosion status of equipment and pipelines, and promptly address corrosion issues.

In summary, the operation of the thermal oil heating system is complex and critical, requiring operators to strictly follow the operating procedures. At the same time, it is also necessary to pay attention to the daily maintenance and upkeep of the system to ensure its long-term stable operation.

Diphenyl ether manufacturer diphenyl ether Shandong