Boiler furnace slag waste heat utilization system and process

Abstract

The invention discloses a boiler furnace slag waste heat utilization system and a process. The boiler furnace slag waste heat utilization system is composed of a dry type slag discharging machine, a cyclone separator and a heat exchanger. An air inlet and first slag inlet of the dry type slag discharging machine are formed in the front end of the dry type slag discharging machine. A slag outlet ofthe dry type slag discharging machine is arranged at the rear end of the dry type slag discharging machine. A gas outlet of the dry type slag discharging machine is arranged on the rear portion of the dry type slag discharging machine. The first slag inlet of the dry type slag discharging machine is connected with an outlet of a boiler slag bucket. A gas outlet of the dry type slag discharging machine is connected with a gas inlet of the cyclone separator. A gas outlet of the cyclone separator is connected with an air channel inlet of the heat exchanger. An air channel outlet of the heat exchanger is connected with a primary air inlet of a boiler. A flue gas channel inlet of the heat exchanger is connected with a flue gas outlet of a wet desulfurization tower. A flue gas channel outlet ofthe heat exchanger is connected with an inlet of a chimney. By means of the boiler furnace slag waste heat utilization system and the process, furnace slag waste heat can be used for reheating post-wet-desulfurization cooled flue gas, residual waste heat can be recycled, and the gradient application of energy of the whole waste heat recycling system is realized.

Description

technical field [0001] The invention belongs to the field of boiler energy saving and environmental protection, and in particular relates to a boiler slag waste heat utilization system and process. Background technique [0002] In the flue gas treatment system of the boiler unit, the wet desulfurization system is mostly used for desulfurization. Because the net flue gas at the outlet of the absorption tower of the wet flue gas desulfurization system is in a state of wet saturation, the temperature drops during the process of flowing through the flue and chimney into the atmosphere. , part of the vaporous water and pollutants in the flue gas will condense, the amount of slurry in the liquid state will increase, and there will be droplets falling in a certain area, which will be deposited on the ground and become white gypsum spots after drying, which is called gypsum rain. [0003] When the flue gas is discharged into the atmosphere at the chimney mouth, due to the temperatur...

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Problems solved by technology

This treatment method not only makes the slag contain a large amount of waste heat and cannot be fully utilized, which affects the thermal efficiency of the boiler, but also causes waste of water resources to a certain extent due to the evaporation of circulating water, and also causes thermal pollution to the environment.

During the immersion of circulating water into slag, the steam generated will also cause corrosion damage to the structure of the boiler body and boiler room in the long run

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