What are the protection functions of the gas steam generator boiler?
What are the protection functions of the gas steam generator boiler?
1. Wind pressure protection: the wind pressure is too low, the burner does not start, ensuring that the wind pressure matches the combustion and the operation is safe;
2. Boiler overpressure protection: through the pressure limiter at the gas outlet of the gas boiler to achieve furnace shutdown protection when the boiler is overpressured and can output an alarm signal;
3. Gas pressure protection: When the gas pressure is lower than the minimum gas pressure switch setting value and higher than the gas pressure switch setting value, the burner can not be started, and another pair of normally closed electric shock can be connected to the alarm;
China has become the world's largest producer of Antipyretic And Analgesic drugs. The output of aspirin, paracetamol, analgin and other varieties has exceeded 10,000 tons, and the output of phenacetin, aminopyrine, antipyrine and other varieties has exceeded 1,000. Ton. At present, the output of Antipyretic analgesics in my country is growing rapidly, and it is expected to grow at a rate of about 8% in the future. The production of intermediates for antipyretic and analgesic drugs is large, and there are many manufacturers. With the growth of antipyretic and analgesic drugs, their intermediates have also developed by leaps and bounds.
In 2003, the domestic consumption of paracetamol increased rapidly, and the export also showed a rapid growth momentum. The export volume was 28,163 tons, and the annual export volume increased by about double. In the first half of 2004, although its export growth slowed down, it still increased. From January to May 2004, the export volume of paracetamol was 12,501 tons, slightly higher than the same period last year. Para-aminophenol is an important intermediate in the synthesis of paracetamol, which is growing rapidly. The annual output of p-aminophenol in my country is 32,000 tons. It is estimated that by 2005, the domestic production of paracetamol will reach more than 50,000 tons, and the pharmaceutical industry will consume 45,000 tons of p-aminophenol. The total demand for phenol is about 50,000 tons, the market gap is large, and the development and utilization prospects are broad.
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