Efficient and energy-saving primary air preheating method

Abstract

An efficient and energy-saving primary air preheating method is that primary air is preheated for four times through cooperation of low-pressure steam and high-pressure steam; specifically, the primary air is preheated for the fourth time through the high-pressure steam, the primary air is preheated for the third time through the low-pressure steam, high-pressure condensate water generated by preheating the primary air through the high-pressure steam is used for carrying out second-time preheating treatment on the primary air, and condensate water generated by preheating the primary air through the low-pressure steam is used for carrying out first-time preheating treatment on the primary air. High-pressure steam used in the efficient and energy-saving primary air preheating method comes from steam extraction of a steam pocket, and low-pressure steam used in the efficient and energy-saving primary air preheating method comes from steam extraction of a steam turbine. The efficient and energy-saving primary air preheating method has the advantages that the design is reasonable, the implementation is easy, four-time preheating treatment can be conducted on primary air, the method is efficient and energy-saving, the preheating effect is good, and economic benefits are effectively improved.

Description

technical field [0001] The invention relates to the technical field of primary air preheating, in particular to a high-efficiency and energy-saving primary air preheating method. Background technique [0002] The primary air refers to the air sent from the lower part of the grate when the layer-burning furnace is burning; the air sent into the furnace together with the pulverized coal when the pulverized coal is burned; the air sent into the furnace from the root of the fire when the oil and gas fuel are burned. [0003] The primary air plays a leading role in the combustion of the boiler. Therefore, in actual operation, the air preheater is generally used to preheat the primary air to ensure the combustion effect of the boiler. However, the existing primary air preheating method There are some disadvantages: [0004] 1. After heat exchange, the temperature of the condensate drain is high, and the steam-water separation is not efficient. Part of the steam directly enters th...

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Problems solved by technology

[0004] 1. After heat exchange, the temperature of the condensate drain is high, and the steam-water separation is not efficient. Part of the steam directly enters the high-pressure drain expander system, and the heat source is not effectively utilized in the air preheater;

[0005] 2. Due to the insufficient effect of the air preheater, the effect of the matching steam trap is not enough. Part of the steam is not condensed and enters the main drain pipe, and the steam and water mix and wash the drain pipe, which is easy to cause leakage of the drain pipe, which seriously affects the safe operation of the system. ;

[0006] 3. The high-pressure drain expander matched with the air preheater drains the water through the atmospheric expander and then enters the drain tank, and the flash steam of the expander is directly discharged into the atmosphere, which cannot be fully utilized

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