Multi-oxygen combustion flue gas recirculation system for pulverized coal boiler

Abstract

The invention provides a pulverized-coal boiler multi-oxygen-combustion smoke recirculation system, which solves the problem of environmental pollution in the pulverized-coal boiler application process and achieves the goals of energy saving and emission reduction. The system comprises a baiting device, a boiler, a primary oxygen pipeline, a first smoke recirculation pipeline, a material conveying pipeline and an automatic control device, wherein the baiting device comprises a powder tank, a rotary valve, a double spiral weighing unit and a hyperbola mixing injector; the boiler is provided with a multi-oxygen combustor which is provided with a primary oxygen lance and a fuel spray lance; the boiler is connected with a smoke master pipe; the primary oxygen pipeline is connected with the primary oxygen lance and provided with a primary oxygen valve station; both ends of the first smoke recirculation pipeline are respectively connected with the smoke master pipe and hyperbola mixing injector; the first smoke recirculation pipeline is provided with a first smoke valve station; both ends of the material conveying pipeline are respectively provided with the hyperbola mixing injector and the fuel spray lance; the automatic control device comprises a PLC (programmable logic controller) upper computer; the PLC upper computer is respectively connected with the baiting device, boiler, primary oxygen valve station and first smoke valve station; and the baiting device, boiler, primary oxygen valve station and first smoke valve station are controlled by the PLC upper computer.

Description

technical field [0001] The invention relates to the technical field of flue gas recirculation, in particular to a multi-oxygen combustion flue gas recirculation system for pulverized coal boilers. Background technique [0002] Pulverized coal combustion technology and its corresponding systems are widely used in my country. The core device of pulverized coal combustion technology is the combustion boiler. In the prior art, the pulverized fuel required in the combustion boiler is mostly transported by compressed air, and the pulverized fuel and air are mixed and burned in the boiler. [0003] The above-mentioned method of using compressed air as the delivery gas has the following defects: First, the proportion of nitrogen in the air accounts for 78%, and the powdered fuel and air are mixed and burned in the boiler, and the temperature in the boiler is extremely high. , the nitrogen in the air reacts with oxygen to produce a variety of nitrogen oxides. The existence of nitrog...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pulverized coal boiler multi-oxygen combustion flue gas recirculation system to solve the problem of environmental pollution caused by the pulverized coal boiler during the application process, and at the same time achieve the effects of energy saving and emission reduction

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