Calculation method of regulating space of slurry circulating system and device thereof

Abstract

The invention relates to a calculation method of a regulating space of a slurry circulating system and a device thereof. The calculation method includes the following steps that according to the equipment size and resistance factor of each part in a slurry circulation pipeline, the loss of a pipeline pressure head is calculated; according to the minimum inlet pressure value to ensure the atomization effect of a nozzle, the minimum flow value of a pipeline is calculated; according to the state parameter of slurry at a pipeline inlet / outlet, the loss of the pipeline pressure head and the minimumflow value of the pipeline, and the minimum lift value of a pump is calculated; according to a performance curve of the pump at other rotation speeds, the minimum flow value of the pipeline and the minimum lift value of the pump, the minimum rotation speed value of the pump is obtained; the space between the minimum rotation speed value of the pump and a rated rotation speed value is a single pipeline regulating space; the sum of the pipeline regulating spaces is the regulating space of the slurry circulating system. According to a regulating device, a frequency converter or a speed regulating hydraulic coupler is additionally installed on the pump of the pipeline. The method can guide the transformation of a desulfurizing slurry circulating system, the safety and stability of operation of a wet desulfurizing system and the flexibility in regulating are improved, and the energy saving effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of wet desulfurization, and in particular relates to a method for calculating adjustment space of a slurry circulation system and a device thereof. Background technique [0002] In the past two years, a large number of domestic coal-fired power generation units have begun to undergo flexible technical transformation and gradually participate in deep peak regulation. However, the flue gas desulfurization (FGD) system using the limestone-gypsum wet desulfurization process is still optimized by the combination of traditional slurry circulation pumps. , Absorption tower slurry pH adjustment and other methods to adjust, lack of rapid adjustment performance and deep adjustment performance, so in order to ensure the stable operation of the desulfurization system and avoid SO 2 If the concentration exceeds the standard discharge, a more conservative operation mode is usually adopted, which leads to the problem of hi...

AI Technical Summary

Problems solved by technology

[0005] (1) Insufficient safety and stability of the desulfurization system: frequent start and stop of high-power pumps will affect the life of the pump motor, the stability of the liquid level of the absorption tower, and cause voltage fluctuations in the power grid in the plant

[0006] (2) Insufficient flexibility of the desulfurization system: For the coal-fired power units participating in peak regulation, the load fluctuations of the units are relatively frequent, and it is difficult for the desulfurization system to follow the main engine to optimize the operation of energy-saving pump combinations, because this adjustment method affects the desulfurization effect. It is nonlinear, that is, the desulfurization system lacks the SO 2 The linear adjustment performance and rapid adjustment performance of concentration and unit load fluctuation; when the unit load is low or the sulfur content of coal is much lower than the design coal sulfur content, even if the most energy-saving operation mode is adopted, it is still possible to reduce SO 2 The emission concentration is very low or even zero, and SO cannot be fully utilized 2 Emission concentration pressure line space, that is, the desulfurization system lacks deep adjustment performance

[0007] (3) The energy consumption of the desulfurization system is relatively high: the increase in the amount of slurry spraying is beneficial to the enhancement of mass transfer performance, thereby improving the desulfurization efficiency, but the desulfurization efficiency increases gradually with the increase in the amount of slurry spraying. When the amount of spraying increases to a certain extent, the impact on improving the desulfurization efficiency becomes smaller, but the energy consumption of the system increases proportionally

After ultra-low emission transformation, most desulfurization systems operate in the high desulfurization efficiency range to meet 35mg / Nm 3 emission standards, and in order to avoid excessive emission caused by fluctuations in working conditions, the net flue gas SO 2 The concentration is relatively low, that is, the desulfurization system cannot make full use of the net flue gas SO 2 Concentration pressure line running space, high energy consumption

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