Safety measures adopted by the rotor +CO exhaust gas treatment device

1、A set of waste gas concentration detector (infrared principle) is set up at the wheel desorption outlet and before the CO equipment to effectively warn and control the generation of dangers. The online detection of waste gas concentration is used to regulate the opening of the fresh air valve to prevent the furnace from overheating; when the waste gas concentration > 15% LEL, the alarm signal is linked with the fresh air valve through the two-level alarm setting, and when the combustible gas detector detects the waste gas concentration > 20% LEL, the waste gas does not enter the CO body, and the system is offline.

2、The corrugated plate flame arrester is installed on the pipeline before the waste gas enters the CO to prevent the flame from spreading and diffusing vertically. When the waste gas backfires, the corrugated plate (flame arrester disk) absorbs the heat energy by the wall effect of the arrester, which extinguishes the flame and prevents the spread of the flame of the combustible gas and prevents backfire from causing an explosion.

3、 CO furnace body is equipped with a pressure relief film at the top, which opens to relieve pressure when the furnace pressure increases to a certain value.

4、When the desorption waste gas passes through the heat exchanger and the temperature reaches the set high alarm value, the electric heater stops heating to prevent the waste gas temperature entering the CO furnace from being too high, causing the CO furnace to exceed the temperature.

5、When compiling the control program for this project, establish interlocking control points to ensure safety. When the furnace pressure or temperature is higher than the maximum set value, the PLC program must make corresponding actions to ensure the safe operation of the equipment.

(1) When the system inlet temperature is high-high, the system enters shutdown, the system inlet valve is closed, and the emergency cut-off valve on the waste gas pipeline is opened for emergency venting.

(2) When the high-high alarm of the outlet temperature of the rotary adsorption and the cooling outlet temperature occur, the system enters the parking, closes the system intake valve, and opens the emergency cut-off valve on the waste gas pipeline for emergency venting.

(3) When the high-high alarm of the turbine wheel desorption outlet temperature is triggered, the system enters shutdown, the system inlet valve is closed, the emergency cut-off valve on the waste gas pipeline is opened for emergency venting, and the fire protection system is opened for fire protection;

(4) When the temperature of the CO furnace exceeds the set value of the high-high alarm, the system enters停车, closes the system inlet valve, opens the emergency cut-off valve on the waste gas pipeline for emergency venting, and at the same time opens the direct discharge valve at the outlet of the CO furnace to directly vent and cool;

(5) The filter, wheel, flame arrester and CO furnace are equipped with differential pressure transmitters to monitor the pressure drop of each device. When the pressure drop exceeds the set value, a high alarm is triggered, and it is necessary to remind the inspection and replacement and send out alarm signals.

(6) The differential pressure transmitter is equipped in the rotary wheel processing area and the desorption area to monitor the pressure drop in the processing area and the desorption area, and to remind inspection and send alarm signals when the value exceeds the set value.

6、When the system is shut down, the waste gas pipeline will be effectively isolated (the system cut-off valve is closed, and the emergency discharge valve is opened) to prevent the accumulation of flammable and explosive waste gases in the wheel for a long time, to prevent the wheel from smoldering.

7、The compressed air system is set with low pressure alarm interlock, when the air pressure is lower than the set value, the system starts the shutdown procedure to ensure the normal operation of the system.

8、Control system setting UPS emergency power supply, when the system power failure, the system emergency power supply provided by UPS emergency power supply automatically switch to provide the system with emergency power. The emergency power supply provides the power needed for PLC to complete the safety shutdown procedure to ensure the safety of the device and to provide the control machine to keep the screen, to meet the operator to understand the fault cause and determine whether the device has been safely shut down.

9、Adopt PLC control, the monitoring system can give sound and light alarm for the fault of the main equipment such as fan, motor and valve, and some of the important equipment are triggered to stop in series.

10、The adsorption fan and the desorption fan are speed regulated by frequency converter (PID regulation according to the set value of the front-end pressure transmitter) to adapt to different air volume requirements.

11、Set up a one-key emergency parking procedure to reduce the risk of operational errors in emergency situations; set up a manual reset procedure for key equipment faults to prevent misoperation from causing safety accidents.

12、The power supply provides an independent circuit breaker and indicator light, the electrical cabinet is locked in place with a lock, and the power indicator light is displayed on the outside of the electrical cabinet, making it easy to identify.

13、In the design of equipment, consider lightning protection design and do a good job of equipment lightning protection and working grounding.

14. When designing parts, it is necessary to consider the use of safety protection devices in the following occasions: transmission mechanisms, cylinder meshing parts, high-temperature surfaces, etc., and post safety warning signs.

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