The coke oven gas produced by the coking enterprises has been burned for a long time in a "daylight" way, which is a waste of resources and pollutes the environment. It is understood that coke oven gas is a by-product of the coking process. The main components are hydrogen and methane, as well as small amounts of olefins, carbon monoxide and carbon dioxide. About 430 cubic meters of coke oven gas is produced for each ton of coke produced, and half of it is used for reburning. According to statistics, in 2007, the coking enterprises above designated size in China produced 328 million tons of coke, produced more than 60 billion cubic meters of coke oven gas, and caused economic losses of more than ten billion yuan. While wasting valuable resources, it also caused extreme environmental problems. Big pollution. To this end, the comprehensive utilization of domestic coke oven gas is imminent.
The new technology for the comprehensive utilization of coke oven gas developed by Shaanxi Golden Nest Investment Co., Ltd. uses coke oven gas as raw material, and after cracking and deep purification, it produces synthetically clean fuel oil, high-purity paraffin and other chemical products. Billion cubic meters of coke oven gas can produce 9,000 tons of 0# diesel and 13,500 tons of high-purity paraffin. According to the introduction of Hu Hongjun, general manager of the company, at the end of 2006, the company invested 100 million yuan to build a 10,000-ton coke oven gas comprehensive utilization industrialization test device in Shaanxi Baoji. The results of the trial run for more than one year show that this technology has advanced production technology, and adopts a number of innovative technologies with independent intellectual property rights in the integration of raw material gas ratios, deep gas purification, and product synthesis. The total sulfur content in the synthesis gas is very low. It reaches 4 mg/m3; product ratio can be adjusted according to market demand, with flexible ratio; environmental protection and energy saving, no "three wastes" emissions in the entire production process, and 8 tons of clean water are produced as a by-product per 1 ton of product. Experts believe that the technology has broad prospects for development, and the promotion value is huge.
It is understood that the current domestic use of coke oven gas is mainly concentrated in the deep processing of fuel, power generation and by-products. The production of methanol and synthetic ammonia from coke oven gas has been applied in China. At present, nearly 10 coke oven gas production methanol projects have been completed and put into operation. There are more than 20 units under construction and proposed facilities, and the total annual methanol production capacity is close to 3 million tons. However, experts in the industry stated that at present, the comprehensive utilization of coke oven gas in China is still immature, and there are still many problems such as the inadequacy or imperfection of key technologies, the protection of gas sources, and the difficulty in recovering coke oven gas from small coking enterprises. Therefore, while continuously improving the existing process routes, it is of great practical significance to continuously develop new routes for the comprehensive utilization of coke oven gas according to the market demand and the actual conditions of the gas sources.
General Manager of Shanghai Chemical Industry Design Institute Co., Ltd. Yu Zhengrong, senior engineer Zhao Mailing and other industry experts said in an interview with reporters that the production of clean fuel oil by the technology of coke oven gas developed by Jinchao Co., Ltd. opened up a new brand of coke oven gas recycling. field. Compared with the production of methanol and synthetic ammonia, the cost of coke oven gas to make fuel oil is lower, the economic benefit is higher, and the environmental protection effect is better. It is estimated that the coke oven gas with an annual output of 1 million tons of coke will be 200 million cubic meters of coke oven gas, with an annual output of 100,000 tons of methanol, an investment of about 250 million yuan, and an annual production value of 330 million yuan, but its energy consumption will be lower. High, the release of gas is still required to recycle; while the same 200 million cubic meters of coke oven gas, with the technology of Golden Nest can produce 18,000 tons of 0# diesel oil, 27,000 tons of high-purity paraffin, annual output value of 480 million yuan, investment only 2.3 billion yuan, and environmental protection and energy saving, the product is less affected by the market. However, Yu Zhengrong also believes that coke oven gas fuel oil as a new technology is still in the exploration and development stage at home and abroad, but also needs to be continuously improved through practice.
It is reported that Jinchao Company has already started preliminary preparations for the industrialization of comprehensive utilization of coke oven gas, and is currently negotiating cooperation with several domestic coking enterprises and plans to build the first industrialized demonstration project. After the success of the project, Golden Nest will vigorously promote the results in 100 domestic coking enterprises and promote the recycling economy in the coking industry. “We have always been committed to the development of alternative energy and recycling economy and have positioned our development direction in the recycling of industrial waste gas. After industrialization of the coke oven gas fuel oil industrialization demonstration project, we will continue to plan the development of coalbed methane and calcium carbide. The comprehensive development and utilization of tail gas has resulted in the construction of oil products and high-purity paraffin wax projects for coal bed gas and calcium carbide tail gas,†Wang Wei, chairman of Golden Nest, told reporters.
At present, the economic operation of the oil and chemical industry faces a double challenge: One side is the tight international energy supply and the continuous soaring oil prices. On the one hand, there is a huge pressure on environmental protection and there is a shortage of clean fuel. An advanced technology that uses coke oven gas to produce clean fuel oil, high-purity paraffin, and other chemical products has now completed a 10,000-ton industrial trial. This technology can significantly increase energy efficiency, promote energy conservation and emission reduction in the industry, and add new routes for the comprehensive utilization of coke oven gas. According to estimates by experts, 100 million cubic meters of coke oven gas can produce nearly 10,000 tons of clean fuel oil.