Device and method for recycling afterheat of smoke of steam boiler

Abstract

The invention relates to recycling of afterheat of smoke of a steam boiler, and in particular relates to a device and method for recycling the afterheat of the smoke of the steam boiler that varies frequently in load. The device comprises at least one buffering water tank (1); a discontinuous water supply inlet (11) is formed in one side of the bottom part of the buffering water tank (1); a continuous circulating cold water outlet (13) connected with one side of a circulating water pump (2) is formed in the other side of the bottom part of the buffering water tank (1); the other side of the circulating water pump (2) is connected with an inlet of a heat exchanger (3); an outlet of the heat exchanger (3) is connected with a continuous circulating hot water inlet (14) at the other side of the top part of the buffering water tank (1); a discontinuous water supply outlet (12) is formed in one side of the top part of the buffering water tank (1). With the adoption of the device for recycling the afterheat, the energy saving efficiency can be raised by more than 9% compared with that of the whole original system.

Description

technical field [0001] The invention relates to waste heat recovery and utilization of steam boiler flue gas, in particular to a waste heat recovery device and a waste heat recovery method for steam boiler flue gas with frequent load changes. Background technique [0002] A large number of industrial gas-fired boilers are used in production enterprises to provide steam heat sources. Due to their flexible operation, simple operation and strong adaptability, these industrial gas-fired boilers will cause frequent start-stop and load changes according to the needs of the production process in practical applications. However, the instability of the operating conditions will affect the change of the exhaust gas volume at the tail, and also cause the change of the boiler feed water rate. The instability of the heat source flow puts forward higher requirements for the control method of the flue gas waste heat recovery system and the design of the recovery device. [0003] As a retr...

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Problems solved by technology

[0002] A large number of industrial gas-fired boilers are used in production enterprises to provide steam heat sources. Due to their flexible operation, simple operation and strong adaptability, these industrial gas-fired boilers will cause frequent start-stop and load changes according to the needs of the production process in practical applications. However, the instability of the operating conditions will affect the change of the exhaust smoke at the tail, and also cause the change of the boiler feed water rate

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