Low-nitrogen shell boiler

Abstract

The invention discloses a low-nitrogen shell boiler which is mainly composed of a furnace pipe, a smoke transfer chamber, a smoke pipe, a boiler shell, a front smoke box, an economizer, a combustor, aCEMS smoke online monitoring system, a denitration temperature measuring point and a denitration reducing agent jetting device. The furnace pipe and the smoke pipe are transversely arranged in the boiler shell. The smoke transfer chamber is arranged at the rear portion of the boiler shell. A film type wall structure is adopted for the smoke transfer chamber to form a diversion film type wall andcommunicates with the furnace pipe so that after fuel is completely combusted in the furnace pipe, generated smoke enters the smoke transfer chamber. The low-nitrogen shell boiler has the beneficial effects that the smoke transfer chamber with the large volume is arranged at the rear portion of the boiler, and the film type wall structure is adopted for the smoke transfer chamber; a temperature sensor and the denitration reducing agent jetting device are arranged in the boiler smoke transfer chamber; due to detection of the temperature of smoke, it can be ensured that a denitration reducing agent can work in the best temperature interval, and the denitration efficiency is improved; and the diversion film type wall is arranged in the boiler smoke transfer chamber, the process is prolonged,sufficient and effective contact and mixing of the denitration reducing agent and the smoke can be ensured, and the denitration efficiency is improved.

Description

Technical field [0001] The invention relates to the field of boilers, and is mainly a low-nitrogen shell boiler. Background technique [0002] In recent years, with the rapid development of my country's economy and the deepening of industrialization and urbanization, energy consumption has continued to increase. At the same time, the ensuing air pollution problem has become increasingly prominent, and the air quality in some cities has gradually deteriorated, becoming the most severe environmental problem facing our country. If effective measures are not taken to prevent further deterioration of the ecological environment, environmental problems may restrict the sustained, rapid and healthy development of my country's economy. [0003] The nitrogen oxides produced in the process of fuel combustion are an important factor affecting ambient air quality. Industrial boilers are large energy consumers. How to reduce the emission of nitrogen oxides in boiler flue gas is the current res...

AI Technical Summary

Problems solved by technology

For natural gas-fired boilers, low-nitrogen technologies such as flue gas recirculation and staged combustion can be used to greatly reduce the emission of nitrogen oxides. The use of flue gas recirculation, staged combustion and other technologies cannot significantly reduce the emission of nitrogen oxides

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