A coal-fired power plant ash storage yard and industrial tailings dust suppression process and device

Abstract

The invention relates to fields of dust suppression processes and devices, and particularly relates to an ash storage field for a coal-fired power plant and a dust suppression process and a device for industrial tailings. The dust suppression process comprises the following steps: ash stack region surface layer compaction, namely spraying water to an ash stack layer surface layer, and carrying out mechanical compaction or water-stable compaction; dust suppression slurry preparation, wherein the raw materials of the dust suppression slurry are formed by mixing of water, cement, aggregate and an auxiliary material; covering the dust suppression slurry, namely spraying the dust suppression slurry. According to the ash storage field for the coal-fired power plant and the dust suppression process and the device for industrial tailings provided by the invention, construction equipment is simple to operate and high in operation efficiency during construction; the construction equipment is capable of spraying 800-1,000m<2> per hour; dust suppression films are free of maintenance after being molded; the period of validity with different time limits can be set according to the difference of the strength and the thickness of the dust suppression films; the dust suppression films, which are relatively long in period of validity, can be subjected to a secondary spraying operation at an interval of a dust suppression period; therefore, the materials are saved by over about 30%; the dust suppression effect is relatively good.

Description

technical field [0001] The technology of the invention relates to the field of dust suppression technology and devices, in particular, to a dust suppression technology and device for coal-fired power plant ash storage yards and industrial tailings. Background technique [0002] Dust from coal-fired power plant ash storage yards and industrial tailings is an open pollution source that enters the atmosphere due to the fine loose particles on the ash storage surface and tailings surface of the ash storage yard that form wind erosion dust under the action of wind or machinery and other power. It is an important part of the total suspended particulate matter in the ambient air. In order to avoid the phenomenon of dust in the above pollution sources, certain dust suppression methods must be adopted to control and ensure that dust storage and industrial tailings will not be polluted by dust during use. [0003] At present, the methods used to control dust in ash storage yards and ...

AI Technical Summary

Problems solved by technology

[0008] ②Requires a large amount of water resources, resulting in waste of water resources;

[0009] ③The spray water seeps into the ground, which will cause serious soil and groundwater pollution (poisonous, arsenic, sulfur and other harmful substances);

[0010] ④It is not suitable for the northern cold areas where power generation companies gather. The ash storage yard needs dust suppression in spring, autumn and winter, and the temperature is below zero, so it will not be used

[0014] ① The cost of covering soil and transportation is high, and the cost of covering the surface of the ash yard is about 30 yuan per square meter;

[0015] ② It is easy to cause secondary dusting of the covering soil, which will pollute the atmosphere;

[0016] ③The overburden occupies the ash storage yard and the volume of industrial tailings accounts for more than one-tenth of the above-mentioned volume. The cumulative volume of overburden will greatly shorten the service life of the ash yard and industrial tailings, resulting in huge investment in production costs. Conventional ash storage The field investment ranges from 70 to 80 million yuan to as many as hundreds of millions of yuan, and covering soil and dust suppression will account for more than one tenth of the investment cost of the ash field;

[0017] ④ Covering soil will not be conducive to the secondary utilization of ash storage resources in the ash storage yard. After covering the soil, the soil will be mixed with fly ash, which will have a great impact on the strength of cement and commercial concrete made from the stored fly ash, and most of them will not be usable.

[0022] ②The maintenance cost is high, and the use of the ash storage yard requires more than 3 to 5 people for maintenance every day;

[0023] ③When the wind force exceeds level 7, it will be blown away by the strong wind, torn, and the dust cannot be controlled.

[0024] (4) Other dust suppressants, not suitable for dust control methods in ash storage yards of power generation enterprises and industrial tailings

[0025] In short, the currently used dust control methods for coal-fired power plant ash storage yards and industrial tailings have disadvantages such as poor control effect, waste of resources, environmental pollution, and high cost.

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