Circulating fluidized bed boiler high efficiency desulfurization technology

Abstract

The invention provides a technology of preparing low heat cement which uses the highly effective desulphurization and the pulverized coal ash of the circulation fluid bed boiler, the sweetening agent is composed of the following component of percent weight: the quick-lime is 70-95%, fluorspar 1-10%, zinc dregs 1-10%, silicon manganese iron slag 1-10%, titanium dregs 1-10%, when using the sweetening agent,it maintains the calcium sulfur ratio of sweetening agent calcareous quantity and the coal-burning sulphur content is 2.5-10.5:1; the invention includes the following step: takes the various components 42-81% of modified pulverized fly ash, 15-50% of cement clinker with the intensity is the 50-65MPa, 3-8% of the alkalinity excitant, 0-20% of the blast furnace slag, 1-5% of the gypsum, mixes and rubs to 0.045mm sieves and the triage which is smaller than 10%, prepares the coal ash low heat cement whose intensity rank is 32.5- 42.5MPa.

Description

technical field [0001] The invention relates to a high-efficiency desulfurization technology for a circulating fluidized bed boiler, which belongs to the field of environmental engineering. The technique of preparing low-heat cement from fly ash involved in the present invention has been proposed as a divisional application. Background technique [0002] Sulfur dioxide is an important indicator of environmental protection. Its annual environmental capacity is 12 million tons, while my country's emission of 25 million tons in 2005 ranks first in the world. 90% of air pollution comes from industry, and 70% of industrial pollution comes from thermal power. 85% of China's energy structure is coal-fired, and thermal power investment increases by more than 50% every year, which will inevitably produce a large amount of sulfur dioxide and carbon dioxide. In order to reduce environmental pollution, strict desulfurization policies must be implemented. At the same time, most of the ...

AI Technical Summary

Problems solved by technology

However, its actual defect at present is that the desulfurization efficiency is low, which can only reach about 50%, which is less than 85% of the design value. At the same time, the power generation efficiency is reduced due to the decomposition of calcium carbonate and absorption of part of the heat; in addition, the pulverized coal produced The gray quality is poor, so it can only be used for low value-added applications such as road backfilling