Modified grate furnace waste incineration device

Abstract

The invention discloses a modified grate furnace waste incineration device. An air vent is formed in the rear arch of a hearth of a waste incineration furnace, is connected with the air chamber of a fire grate at the drying section of an incinerator through a pipeline, and is also connected with an outlet flue of the hearth of the incinerator through the pipeline; the coal economizer outlet of a waste heat boiler joins the pipeline connected with the air vent of the rear arch of the hearth through the pipeline; a circulating fan is further arranged on the pipeline; an air conditioning bypass is arranged at the inlet of the circulating fan. According to the invention, partial hot smoke containing certain content of oxygen at the tail part of the hearth and the partial hot smoke at the outlet of the coal economizer are recycled, so that drying and preheating of waste and disturbance and combustion support of smoke are met, the fed combustion air amount and the total smoke amount can be effectively reduced, the oxygen content of a combustion area is reasonably controlled, improvement of the waste combustion quality is facilitated, improvement of the utilization efficiency of combustion thermal energy is also facilitated, and the content of pollutants in the discharged flue gas is decreased.

Description

technical field [0001] The invention belongs to the field of domestic waste treatment, and in particular relates to an improved grate furnace waste incineration device. Background technique [0002] With the rapid development of the national economy and the acceleration of the urbanization process, people's living standards are improving day by day, and the amount of municipal solid waste is increasing. Getting rid of the dependence on a large amount of land resources and meeting the dual requirements of environmental protection and resource utilization will gradually become the main garbage disposal method. [0003] In recent years, under the encouragement of the national industrial policy of domestic waste reduction, harmlessness and recycling, my country's waste incineration industry has entered a period of rapid development. At present, the main application in China is the direct incineration treatment of grate furnace and waste heat power generation technology, which e...

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Problems solved by technology

However, my country's waste incineration has the following problems: domestic waste has low calorific value, high moisture, heavy ash, and large seasonal changes, which are not conducive to stable combustion. In order to achieve effective drying and preheating of waste, the traditional design of the drying section A large amount of primary air is introduced into the chamber, which is beneficial to promote the drying of the garbage, but also increases the excessive air required for combustion, thereby increasing the total amount of flue gas and affecting the overall operation level; For the full combustion of unburned flue gas, the traditional secondary air design also introduces too much air required for combustion to a certain extent

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