Steam production steam-water system with waste heat recovery function

Abstract

The invention relates to a steam production steam-water system with a waste heat recovery function. The system is provided with a combustion boiler, a water supply unit and a steam production unit; the water supply unit comprises a raw water softening and desalting treatment device and an oxygen removal device; the steam production unit comprises coal economizers, a water cooling wall and superheaters; the coal economizers comprise an upper-level coal economizer, a middle-level coal economizer and a lower-level coal economizer, the water cooling wall is arranged on the inner wall of the hearthof the combustion boiler, the superheaters comprise a low-temperature superheater, a desuperheater and a high-temperature superheater which are sequentially connected, the lower-level coal economizeris connected with the oxygen removal device, the upper-level coal economizer is connected with the water cooling wall, and the water cooling wall is connected with the low-temperature superheater. According to the system, the water supply unit is used for softening and desalting the supplied water, so that corrosion can be avoided, in addition, the three stages of coal economizers are arranged, so that the contact area between the flue gas and the supplied water can be enhanced, the heat exchange capacity of the flue gas is improved, therefore, the flue gas waste heat resources are efficiently utilized, the steam production cost is reduced, meanwhile, flue gas cooling is facilitated, and the environmental protection effect is achieved.

Description

technical field [0001] The invention relates to the field of boiler combustion systems, in particular to a waste heat recovery steam production system. Background technique [0002] The use of boilers in my country is very common. At present, there are about 500,000 industrial boilers in my country. The average capacity of a single boiler is small, the overall energy consumption level of the boiler is high, the management level of energy saving and emission reduction is low, and energy waste is serious. [0003] Among them, for conventional heating boilers, there is a large amount of high-temperature flue gas, and the exhaust gas temperature of most boilers is above 300°C. It is a kind of waste, and it will cause environmental heat pollution due to the temperature rise near the smoke exhaust port. Contents of the invention [0004] The present invention is proposed in view of the above problems, and its purpose is to provide a waste heat recovery steam production system, ...

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Problems solved by technology

[0003] Among them, for conventional heating boilers, there is a large amount of high-temperature flue gas, and the exhaust gas temperature of most boilers is above 300°C. It is a waste, and it will cause environmental heat pollution due to the temperature rise near the smoke exhaust port

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