Rebalance system and method for wet-process desulfurization water system of heat-engine plant

Abstract

The invention relates to a rebalance system and method for a wet-process desulfurization water system of a heat-engine plant. The problem that water of a desulfurization system is deeply saved while a water system of the desulfurization system is rebalanced is not solved. The rebalance system comprises a gypsum carrying water pipe and a desulfurization wastewater pipe and is characterized by further comprising a water pipe for replacing pulping water with filtering water, a water pipe for replacing filter cloth filter cake washing water with the filtering water, and a water pipe for replacing demister washing water with the filtering water, wherein the two ends of the water pipe for replacing the pulping water with the filtering water are connected with a washing filtering water tank and a pulp tank respectively; and the two ends of the water pipe for replacing the filter cloth filter cake washing water with the filtering water are connected with the washing filtering water tank and a filter cloth filter cake respectively. The rebalance method has the characteristics that the filtering water in the filtering water tank is conveyed into the pulp tank by the water pipe for replacing the pulping water with the filtering water and is used for completely or partially replacing the pulping water. According to the rebalance system and method, the deep water saving is carried out on the desulfurization system so that the water system of the desulfurization system is rebalanced.

Description

technical field [0001] The present invention relates to a water system rebalancing system and rebalancing method, in particular to a thermal power plant wet desulfurization water system rebalancing system and rebalancing method, which is mainly used to solve the problem of installing low-temperature coal saving before the wet desulfurization device The device, or the flue gas system is equipped with a GGH system, and the wet desulfurization water balance imbalance problem caused by the low-load operation of the thermal power plant, the present invention re-establishes a new water balance system and method. Background technique [0002] At present, most of the domestic large units adopt the limestone-gypsum wet flue gas desulfurization process, that is, wet desulfurization. The main technical and economic indicators of wet desulfurization process operation include desulfurization efficiency, utilization rate of desulfurization equipment, limestone consumption, electricity con...

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Problems solved by technology

[0003] When the desulfurization system is in operation, by reducing the flue gas temperature at the inlet of the desulfurization absorption tower and reducing the steam content in the net flue gas, the deep water saving of the desulfurization system can be achieved, but the total water input to the desulfurization system remains unchanged, so that the input into the desulfurization system remains unchanged. The water volume of the desulfurization system is greater than the water output of the desulfurization system to the outside world, resulting in an excessively high liquid level in the absorption tower of the desulfurization system, nowhere to discharge the slurry in the desulfurization system, and the original balance of the water system is destroyed

[0004] There is also a relatively good desulfurization tower structure used in the wet desulfurization water system of thermal power plants. For example, in the Chinese patent with the publication date of January 05, 2011 and the publication number CN101934195A, a desulfurization tower suitable for wet desulfurization is disclosed. Tower-type sleeve-type desulfurization tower, the sleeve-type desulfurization tower includes a cooling section, an air intake box, an air distribution pipe, a slurry pool, an air outlet box, and a clean flue gas outlet. The cooling section is set on the upper end of the air intake box, and the air distribution pipe is set At the lower end of the air intake box, the slurry pool is set at the lower part of the air distribution pipe. The air intake box and the air outlet box are sleeve-type structures. The air outlet box is covered on the periphery of the air intake box and is closed with the slurry pool. The net flue gas outlet is set in the air outlet box. In the upper part, the flue gas enters the cooling section from the top of the sleeve-type desulfurization tower, and enters the air intake box after secondary cooling. The desulfurization slurry is used for cooling instead of process water. Although it can play a role in not affecting the overall water balance of the desulfurization system, However, it is difficult to achieve the purpose of deep water saving

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