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Analysis of Waste Heat Recovery in Gas - fired Gas - Making System
TIME:2017-2-15 15:01:49 | VIEW:
1) First, the analysis of the gas furnace type is mostly moving bed UGI furnace type of furnace (operating form of oxygen-rich, oxygen and intermittent gas, etc.), in order to prevent hangers, scarring, gas furnace furnace cooling System cooling form, the vast majority has also been used in circular water tank type water jacket, this water jacket in the use of the following deficiencies: First, poor pressure resistance, the pressure of saturated steam produced (≤ 0.2MPa ) And the temperature is low, it is difficult to overheat, so that gas into the furnace steam decomposition rate is low, high steam consumption; Second, the heat loss is serious, due to the water jacket of the cold wall effect consumed a large number of effective gas heat furnace. Semi-water gas in the decomposition of the steam will take away a lot of heat in the furnace, directly reducing the gas-making furnace gas strength. And because the pressure is too low, is not conducive to the extension of cogeneration and thermal energy utilization, comprehensive consideration is a waste of energy; Third, short life, jacket bottom of the sink due to long-term work in the dew point temperature below, serious corrosion, low temperature dew point corrosion increased wear , So that the gas furnace water jacket life shortened.
2) Second, the gas system semi-water gas, water gas heat recovery (waste heat boiler) and more use of fire pipe, water pipes and heat pipes and other forms of heat exchanger. Due to the limitations of the design, there are some problems such as the heat transfer form of the fire tube, the elimination of the thermal stress of the tube sheet and the long-term safety of the operation. The heat transfer efficiency of the water pipe is low, Low, and dew point fouling, corrosion, resulting in ash block, there is a heat exchanger failure and other issues.
3) Third, due to the gas furnace water jacket, waste pan design operating pressure is low, with supporting the use of larger steam drum shape, management difficulties.
4) the urgency of the Trinity technology. Gas furnace water jacket, waste pot actual design, operating pressure is less than 0.1MPa, so that the furnace steam temperature is low, the effective heat loss more directly affect the gas strength. And is not fully reasonable, the extension of the use of these heat, such as low-voltage power generation and superheated steam drive turbine drive equipment and other comprehensive utilization. Thus highlighting the gas furnace water jacket, waste heat boiler, steam drum pressure trinity operation of the urgency and necessity.
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