Electrical & Instrument assembly requirements in PSA oxygen generator machine room
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The rational configuration and application of electrical parts & instruments in PSA oxygen generator machine room can improve the industrialization of the oxygen production line, improve processing accuracy, improve efficiency, reduce error and reduce labor cost. It can also directly read the production data and master the production progress at any time. At the same time, the alarm instrument can timely detect the occurrence of dangerous situations, and the interlocking device can automatically respond to emergencies, so as to avoid further development of the situation and reduce the occurrence of safety accidents and casualties. It can be said that the application of electrical parts & instruments is an indispensable part of PSA oxygen generator. Similarly, the electrical parts and instruments assembling shall also follow certain specifications and standards, specifically:

 

1. The power supply load classification of PSA oxygen generator machine room shall comply with the relevant provisions of the current(GB50052). Except for those whose interruption of gas supply will cause great losses, it should be class III load.

2. The electrical facilities in rooms or areas with explosion and fire hazards shall comply with the relevant provisions of the current(GB50058). The centrifugal oxygen compressor room and oxygen pressure regulating valve group room shall be Zone 21 fire hazard area.

3. Except that the interruption of gas supply will cause great losses, emergency lighting for continuous operation is not a MUST for the lighting of PSA oxygen generator machine room. Local lighting should be set at the centralized place of instruments.

4. The oil storage in the room with high-pressure oil switch shall not be greater than 25kg.

5. Interlock link signals should be set between the compressor room of air separation products and the bottle filling room, air bag or gas storage tank room. Emergency stop button of booster compressor shall be set in bottle filling room.

6. PSA oxygen generator machine room shall be equipped with power, water and other measuring instruments required for cost accounting, as well as measuring, telemetering and recording instruments for outputting of air separation products.

7. Instruments in contact with oxygen must be free of grease.

8. Various equipment accumulating liquid oxygen and liquid air, oxygen compressor, oxygen filling platform and oxygen pipeline shall be equipped with electrostatic conductive grounding device, and the grounding resistance shall not be greater than 10 Ohm.

9. The lightning protection design of oxygen station, oxygen storage tank and liquid oxygen storage tank with yellow cloth in the open air shall comply with the relevant provisions of the current(GB50057).

10. The oxygen generator machine room shall be equipped with the following analytical instruments according to the needs of gas production, storage, transportation and filling:

 ① Oxygen purity analysis of air separation products at the outlet of product oxygen

     Analysis of impurity content in the outlet of high purity air separation products

Regularly detect the oxygen content in the air of oxygen making room, oxygen compressor room, oxygen storage tank room, oxygen bottle filling room, etc.

11. In addition to various measurement and control devices equipped with various equipments, the following parameter measurement and control devices shall be installed in PSA oxygen generator machine room:

 ① Pressure test and regulation of various air separation products at the outlet of the station building

Gas escape and exhaust pressure measuring room, purity detection and flow regulation device of gas compressor for transmission

 ③ Remote measurement and recording of gas storage tank pressure

 ④ Telemetering and recording of outlet pressure and temperature of gas making equipment

 ⑤ Display and record the operation status of each single equipment

    12. The following alarm interlocking control devices should be set in PSA oxygen generator machine room:

 ① Alarm for excessive carbon dioxide at the outlet of raw air purification unit

Alarm for exceeding standard of acetylene and hydrocarbon in liquid oxygen of main condensing evaporator of air separation unit

 ③ Alarm for unqualified product purity at the outlet of air separation unit

The compressor lubricating oil system is equipped with alarm and interlock control for high, low oil pressure and high oil temperature

The bottle filling compressor room and bottle filling room shall be equipped with contact signal alarm and interlocking control device


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