Air pre-heater and tail waste heat utilization equipment ammonium bisulfate deposition preventing system and control method thereof
An ammonium bisulfate and air preheater technology is applied in the field of air preheating of boilers, which can solve the problems such as the inability to completely remove the clogging and deposition of the rotary ammonium bisulfate, the incompleteness and the lack of careful consideration, so as to reduce the loss and reduce the Power consumption and the effect of reducing smoke and wind resistance
Pending Publication Date: 2020-06-12
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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Problems solved by technology
[0007] The above technologies are all based on increasing the flue gas temperature at the outlet of the rotary air preheater to prevent the condensation of ammonium bisulfate and avoid the cleaning and maintenance of the rotary air preheater with a complicated structure. temperature, which slows down the corrosion of the cold end of the rotary preheater, but it cannot completely remove the clogging and deposition of the rotary ammonium bisulfate, and how to comprehensively utilize the existing boiler equipment and waste heat, etc., has not been fully considered. Complete, there is a need for improvement
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[0030] Such as figure 1 , figure 2 and image 3 As shown, a 300MW coal-fired boiler unit is taken as an example for illustration.
[0031] The unit has been transformed by applying the invention.
[0032] Before the transformation, the rotary air preheater was seriously clogged, and the side resistance of the flue gas was about 3000Pa, which greatly exceeded the original design value, and the exhaust gas temperature of the air preheater was relatively high, up to 160°C in summer (based on 40°C air intake).
[0033] The specific modification plan is as follows.
[0034] A flue gas heat exchanger 2 is installed in the flue after the air preheater. Before the flue gas heat exchanger 2 is the flue (inlet section) 1, and after the flue gas heat exchanger 2 is the flue (exit section) 3. The flue gas exchange Heater 2 is divided into four heat exchange modules 12, and the low temperature section of each heat exchange module 12 is provided with a wall temperature thermocouple 18,...
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The invention relates to the field of boiler system air preheating, and discloses an air pre-heater and tail waste heat utilization equipment ammonium bisulfate deposition preventing system and a control method thereof. The system involves an air pre-heater, a flue gas heat exchanger is arranged in a gas duct behind the air pre-heater, the flue gas heat exchanger is composed of at least two parallel heat exchange modules, each heat exchange module corresponds to a flue gas channel and a liquid phase working medium channel, the heat exchange modules are isolated from one another and can independently control flue gas-working medium heat exchange, the flue gas channels provided with heating flue gas inlets, and a working medium constant pressure system and a working medium heating device arearranged for a working medium of the flue gas heat exchanger. The system and method can reduce the flue gas resistance of the system, reduce the power consumption of an air feeder and a primary air fan, reduce the loss caused by blowing-out cleaning of the air pre-heater, reduce the smoke exhaust temperature of a boiler and thoroughly solve the problem of ammonium bisulfate blockage of the air pre-heater and tail waste heat utilization equipment, and is suitable for new design or transformation of a boiler preheating system.
Description
technical field [0001] The invention relates to air preheating of boilers, in particular to a system capable of preventing the deposition of ammonium bisulfate in air preheaters and tail waste heat utilization equipment. Background technique [0002] In large coal-fired boilers used for power generation, the air preheating device of the boiler usually adopts a tube preheater or a rotary preheater, a small power unit uses a tube preheater, and a large power unit uses a rotary preheater. heater. As the national environmental protection policy becomes more and more stringent, NO in the flue gas of coal-fired boilers X The emission concentration is getting lower and lower, and the SCR technology under the ultra-low emission requirement makes excessive ammonia injection and SO in the flue gas 3 The reaction produces ammonium bisulfate, which is attached to the heat exchange element at the cold end of the rotary air preheater or the tube wall of the tubular preheater, resulting ...
Claims
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IPC IPC(8): F23L15/04F23J15/02F28D21/00F28F27/00F23J3/02
CPCF23J3/02F23J15/022F23L15/04F28D21/0014F28F27/00Y02E20/34
Inventor 李小荣龚超冉燊铭陈刚
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP