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This standard was prepared in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by State Administration of Quality and Technical Supervision.
This standard is under the jurisdiction of the Subcommittee on Chemical Safety of National Technical Committee on Safety Production of Standardization Administration of China (SAC/TC 288/SC 3).
Rules of Safety Technology of Produced Calcium Carbide
1 Scope
This standard specifies the safety technology requirements of each position during calcium carbide production.
This standard applies to calcium carbide production with submerged arc furnace, in which lime and carbon materials are adopted as raw materials.
2 Normative References
The following documents for the application of this document are essential. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB 10665 Calcium Carbide
YB 5215 Electrode Paste
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
furnace of calcium carbide; calcium carbide furnace
submerged arc furnace producing calcium carbide, with lime and carbon materials as the raw materials
3.2
airtight calcium carbide furnace
calcium carbide furnace producing calcium carbide with airtight process
4 Requirements
4.1 Safety technical requirements for raw materials
4.1.1 Strictly control the quality of raw materials so that calcium carbide products meet the requirements of GB 10665.
4.1.2 The quality of electrode paste shall meet the requirements of YB 5215.
4.2 Safety technology indexes for production process control
4.2.1 The oxygen content of protective nitrogen shall be not larger than 0.5%.
4.2.2 The acetylene content within equipment and facilities storing calcium carbide shall be less than 0.5%.
4.2.3 The carbon monoxide content in the air of the operation site shall less than 30 mg/m3.
4.2.4 The noise shall be less than 80 dB.
4.2.5 The water content of carbon materials entering into furnace shall be not larger than 1%.
4.2.6 The furnace pressure shall be -10 Pa~10 Pa.
4.3 Raw materials preparation and conveying positions
4.3.1 Before operating the crusher, it shall be checked that whether the crusher is blocked by materials or foreign matters, the equipment shall not be started with load.
4.3.2 Before operating the conveying equipment, it shall be confirmed that the screening equipment, drying equipment, hoist, belt conveyer, roller, jockey pulley, vibrating machine, deduster, vibrating feeder and equipment driving parts, etc. (lubricating points) are in good condition, and the material storage bin has material receiving space.
4.3.3 After it is confirmed that the equipment is in good condition, the equipment shall be started according to the specified operating provisions, and feeding, crushing and conveying may be conducted after the equipment operates normally.
4.3.4 During equipment operation, it is not allowed to put hands into the feed inlet or other rotating parts of crusher for taking objects, cleaning, oiling or troubleshooting.
4.3.5 During normal production, the operation condition of screening equipment, hopper and belt conveyer shall be inspected regularly, and it shall be handled timely in case of any abnormality.
4.3.6 The discharge rate shall be controlled to ensure that it is even.
4.3.7 The site and equipment shall be cleaned from high to low positons.
4.3.8 In case of the following conditions, the equipment shall be stopped and the power supply of electric equipment shall be cut off effectively;
a) The crusher is blocked by materials;
b) The screening equipment is overfilled, blocked or pours materials;
c) The conveyor belt slips;
d) The belt is blocked by lime;
e) The equipment has other operation abnormalities.
4.3.9 Before igniting hot blast furnace, it shall be confirmed that the furnace internal parts and gas pipeline have been replaced to be qualified.
4.3.10 During normal operation of hot blast furnace, the internal pressure of furnace shall be controlled between -20Pa~0Pa, and operating at positive pressure is not allowed.
4.3.11 After feeding of dryer, the rotation speed of the machine shall be adjusted according to the material water content so that it can adapt to the requirements of drying process.
4.3.12 Before shutdown, dryer shall operate without load, and the drum shall be shut down to dry the motor after the surface temperature of drum is close to the room temperature.
4.3.13 The filter bag used for drying tail gas bag deduster shall be subjected to anti-static treatment.
4.3.14 The injecting gas used for drying tail gas bag deduster shall be dried air.
4.3.15 After drying, carbon material storage bin of low ignition point shall be kept airtight and have protective device, long-time storage without any safeguard measure shall be avoided.
4.4 Electrode paste position
4.4.1 Electrode paste shall be lifted with special facilities in a stable way.
4.4.2 Electrode paste shall be added only after removal of conductive matters between electrodes of two phases and those at the parts likely to have arc strike due to conduction.
4.4.3 The size of electrode paste put into electrode barrel shall be less than 10cm, and the paste type, feeding consumption, and paste face depth shall be recorded clearly.
4.4.4 It is not allowed to stand on the rotating parts to conduct operation of measuring electrode paste column.
4.4.5 Insulation cover shall be applied for protection after electrode paste is added and the site is cleaned.
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Requirements
