Multi-layer parallel-connection overlaid frame type spraying flue gas waste heat recovery and heat exchange device

Abstract

The invention discloses a multi-layer parallel-connection overlaid frame type spraying flue gas waste heat recovery and heat exchange device. The device comprises a flue gas waste heat recovery and heat exchange tower, a multi-layer overlaid parallel-connection flue gas system, a multi-layer overlaid spraying and delivering loop system, an alkaline adding neutralization system and a waste great recovery heat energy utilizing system. A plurality of overlaid spraying flue gas waste heat recovery and heat exchange assemblies are arranged in the flue gas waste heat recovery and heat exchange tower, supported and connected into a whole through a heat exchanger tower frame structure and connected in parallel on a flue gas circulating loop. According to the multi-layer parallel-connection overlaid frame type spraying flue gas waste heat recovery and heat exchange device, the heat exchange performance of the device is remarkably enhanced, and recovered waste heat can be increased by 20-40%; flue gas flowing resistance and the power consumption of a draught fan are remarkably reduced, all the spraying flue gas waste heat recovery and heat exchange assemblies can independently run, and running is more economical and more flexible; the acidoid absorbing performance can also be remarkably improved, and therefore the desulfurization and denitration dust removal effects of flue gas can be greatly enhanced; meanwhile, the occupied area can also be remarkably reduced, cost of investment is saved, the quality of equipment can be monitored conveniently, and potential safety hazards of site construction are reduced.

Description

technical field [0001] The invention relates to the field of flue gas waste heat recovery equipment, in particular to a multi-layer parallel stacked frame type spray flue gas waste heat recovery heat exchange device. Background technique [0002] The deep recovery and utilization of waste heat of flue gas can obtain significant energy saving and environmental protection benefits. At present, the flue gas waste heat recovery devices of large boilers generally adopt partition wall heat exchange devices with fins or spray contact heat exchange devices. In the partition wall heat exchange device, the cooling circulating water and the flue gas are separated by a solid wall, and the heat of the flue gas is transferred to the cooling circulating water through the solid wall. The use of a partitioned heat exchange device is beneficial to ensure the quality of circulating water, but the heat transfer effect of the partitioned heat exchange device is poor, and the pipelines of the he...

AI Technical Summary

Problems solved by technology

The use of a partitioned heat exchange device is beneficial to ensure the quality of circulating water, but the heat transfer effect of the partitioned heat exchange device is poor, and the pipelines of the heat exchange equipment are large, complex and occupy a large area. Scale blockage will affect the heat exchange effect and increase the burden of maintenance and cleaning in the later period, resulting in shortened service life of the device

In the spray contact flue gas-water heat exchange device, in order to increase the air-water contact area, the cooling water needs to be fine mist particles, which leads to a substantial increase in the flow resistance of the flue gas, resulting in a large fan power consumption , the operating cost is high, and at the same time, in order to increase the gas-water contact area and contact time, the volume of the heat exchange device needs to be set larger, especially when recovering the waste heat of the flue gas of a large boiler, the matching low-temperature flue gas depth The waste heat recovery heat exchange device is bulky, requires high investment, and occupies a large area, which is sometimes even too large to bear and implement.

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