Air outlet structure of tubular air preheater

Abstract

The invention provides an air outlet structure of a tubular air preheater, which can be used for reasonably distributing temperatures of primary air and secondary air to ensure that the primary air has high drying efficiency to pulverized coal so that heat efficiency of combustion is increased. The air outlet structure comprises an upper channel group of an upper-stage air preheater channel, a lower channel group of the upper-stage air preheater channel, an upper channel group of a low-stage air preheater channel and a lower channel group of the low-stage air preheater channel. The air outletstructure is characterized in that a cold air inlet is communicated with the lower channel group of the low-stage air preheater channel, the upper channel group of the low-stage air preheater channelcomprises three horizontal independent channels, the lower channel group of the low-stage air preheater channel is respectively corresponding connected with the three independent channels of the upper channel group of the low-stage air preheater channel at the upper part of the air outlet structure through a lower communicating box, the lower channel group of the upper-stage air preheater channelcomprises three horizontal independent channels, the three independent channels of the upper channel group of the low-stage air preheater channel are respectively correspondingly connected with the three independent channels of the lower channel group of the upper-stage air preheater channel at the upper part of the air outlet structure through an upper communicating box.

Description

technical field [0001] The invention relates to the structural technical field of a tubular air preheater, in particular to the air outlet structure of the tubular air preheater. Background technique [0002] Tubular air preheater is a gas-gas heat exchanger that uses the heat of flue gas to heat the air required for boiler combustion. It is an important and indispensable part of power plant boilers. The main function of the air preheater is to heat the combustion air and reduce the exhaust gas temperature to improve the boiler efficiency. One of the important functions is that the flue gas heats the air to a temperature that speeds up the drying of the fuel and the evolution of volatiles. [0003] When the boiler burns coal with high moisture content, the temperature of the desiccant required by the pulverized coal is high, and it is necessary to obtain a hot air of about 380°C to meet the drying output requirements of the pulverizing system, while the air from the air...

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Problems solved by technology

[0003] When the boiler burns coal with high moisture content, the temperature of the desiccant required by the pulverized coal is high, and it is necessary to obtain a hot air of about 380°C to meet the drying output requirements of the pulverizing system, while the air from the air preheater The secondary hot air only needs about 320°C to participate in the combustion, while the air outlet of the existing tubular air preheater leads to the position of the primary air and secondary air of the boiler through different pipelines, so that the primary air and secondary air The temperature of the location is the same, although the temperature of the secondary air can be ensured, but the temperature of the primary air is low, which reduces the drying efficiency of coal powder, and then reduces the thermal efficiency of combustion

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