Desulfurization and denitration powder preheating gas generator and corresponding powder boiler

Abstract

The invention relates to a desulfurization and denitration powder preheating gas generator and a corresponding powder boiler. An existing pulverized coal preheating burner and a corresponding boiler are small in operation elastic space. Therefore, the desulfurization and denitration powder preheating gas generator comprises a preheating combustion chamber, a gas-solid separator and a return feeder; the preheating combustion chamber is provided with a feeding pipe; and a feeding valve or a spiral feeding machine are arranged at the upper end of the feeding pipe, and the feeding pipe communicates with the bottom of a feeding hopper through the feeding valve or the spiral feeding machine. A gas-solid pre-separation chamber and / or an auxiliary gas-solid separator can also be additionally arranged, the gas-solid pre-separation chamber and / or the auxiliary gas-solid separator respectively comprise an expansion shell, the cross sectional area of an inner cavity of each expansion shell is larger than or equal to 1.3 times that of an inner cavity of a preheating combustion chamber fluidized bed or a gas outlet pipe, and the height of each expansion shell is larger than or equal to 0.5 m. The desulfurization and denitration powder preheating gas generator and the corresponding powder boiler are strong in coal adaptability, low in in-boiler NOX emission, high in in-boiler desulfurizationefficiency, large in operation elastic space, easy in operation balance, easy in maintenance after balance, and suitable for various existing industrial and power station boilers.

Description

technical field [0001] The invention relates to a desulfurization and denitrification powder material preheating gas generator and a corresponding powder material boiler (including a powder material horizontal combustion boiler and a powder material vertical combustion boiler). Background technique [0002] 2018.03.23 authorized announcement, the Chinese invention patent with the announcement number CN 104791775 B discloses a vertical pulverized coal boiler with a bottom burner, 2015.08.12 authorized announcement, the announcement number is CN 204554755 U Chinese utility model publication waste heat boiler used in conjunction with it. [0003] The pulverized coal preheating burner disclosed in CN 104791775 B includes a preheating combustion chamber, a gas-solid separator and a feeder connected in sequence, and the three form a circulating fluidized bed gas generator. The vertical pulverized coal boiler has the advantages of sufficient combustion, small tail gas treatment bu...

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Problems solved by technology

However, this kind of pulverized coal preheating burner and corresponding vertical boilers have been used industrially in China, but they all have problems such as small operating flexibility space, difficult establishment of material balance during operation, and easy material loss after the establishment of material balance. , is currently under continuous improvement

[0006] In addition, desulfurization in pulverized coal combustion boilers has not been applied in industrial boilers

Research institutes and technology companies at home and abroad have carried out many desulfurization experiments in pulverized coal industrial boilers, but most of them stay in the laboratory research stage, and have not conducted in-depth research on the particle size, dispersion, atomization, etc. of calcium desulfurizers.

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