Waste treatment waste was converted to Baotai Huashi slag power plant good desulfurization agent can digest 64% of calcium carbide slag, but also can make desulfurization rate of 95% or more
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Taihua Chlor-alkali Company has an annual production capacity of 80,000 tons of PVC, and discharges about 110,000 tons of calcium carbide slag each year. The piles of calcium carbide slag piled up dust in the area, and its disposal has also become a chronic problem for the company.
Taiyuan First Thermal Power Plant, which is adjacent to Taihua Chlor-Alkali, is a large emitter in Taiyuan City. It emitted about 68,800 tons of sulphur dioxide last year, accounting for 38% of the city's total emissions. At present, the plant installed a flue gas desulphurization device on two of the six boilers. Although it has achieved good social benefits, limestone is used as a desulfurizing agent and consumes about 75,000 tons of limestone annually. 3.38 million yuan to increase the cost of power generation by 8.3%.
In order to solve the problems encountered by both parties, they took expert advice. Since last October, they have conducted a series of trials in which calcium carbide slag replaces limestone as a desulfurizer. Tests have shown that if calcium carbide slag is used as a desulfurization agent, the desulfurization efficiency can reach 95% or more and it can completely replace limestone. At the same time as the desulfurization, the product gypsum purity can reach more than 85%.
According to reports, the current cooperation between the two parties has been upgraded from trials to long-term cooperation. The 1.5 kilometer carbide slag conveying system just completed was put into operation. At present, the Taiyuan First Thermal Power Plant can digest about 50 tons of calcium carbide slag every day. By 2006, 11 # and 13 # 2 × 300 MW units flue gas desulfurization unit put into operation, the daily use of calcium carbide slag can reach 450 tons, accounting for the current production of chloralkali calcium carbide slag at 64%. Taihua chlor-alkali company's deposition of millions of tons of calcium carbide slag for many years will be digested and absorbed in the next few years. The use of calcium carbide slag has saved the one-time investment in the limestone powder milling and pulping system for the subsequent construction of thermal power plant desulfurization equipment, and the initial estimate has saved more than 10 million yuan. At the same time, the annual output of limestone is reduced by 240,000 tons, and 260,000 tons of gypsum is produced. This protects the natural environment, realizes the recycling of calcium carbide slag, breaks out of industry boundaries, and realizes a win-win circular economy model in the process of pollution control. .
Post-editing: Doing Well The use of calcium carbide slag from chemical companies to desulfurize power plant flue gas, Taihua Chlor-alkali and Taiyuan Thermal Power Plant have completed a meaningful cooperation – this is a successful case for the development of circular economy between factories.
We have reported that many companies have been looking for circular economy chains. However, all of them are internally digesting their own waste. Although the effectiveness is significant, the human and financial resources spent on finding waste outlets can be excessive. This practice of Taihua has opened up a new idea for chemical companies: The waste of chemicals may be needed by other industries. Why don't you look outwards, look at other industries and see the neighbors around you.
The accumulation of calcium carbide slag in chemical companies is a headache for many years. There is also great pressure on nearby power plants to find low-cost desulfurizers to reduce costs. In both of these situations, it is necessary to have people who want to wear needles, and scientific experiments are needed to find out the points of convergence between different companies. In this case, companies must be committed - not to let go of cooperation opportunities with any other unrelated companies; experts and relevant departments must do more to help people - to help both sides solve practical difficulties to create more opportunity to wear stitches, to create inter- factory cooperation Good environment.