China is the world's largest producer of calcium carbide, with a production capacity of 41 million tons, and its output in 2014 was about 26 million tons. Among them, the capacity of closed calcium carbide furnace is more than 30 million tons, and the total amount of calcium carbide furnace gas by-produced reaches 12 billion Nm3. The content of CO in the exhaust gas of the calcium carbide furnace is 70% ~ 90%. If it is fully recycled, about 8 billion Nm3 / year CO can be obtained. (According to the data provided by China calcium carbide industry association and Asia Chemical Consulting)
High-purity CO is a high-quality chemical raw material. At present, most of the calcium carbide exhaust is used for combustion, which not only has low utilization efficiency but also has a large amount of carbon emissions. If high-quality resources can be used, it will not only bring significant economic benefits to enterprises, but also contribute to China's energy conservation and emission reduction and environmental protection cause.
The production of 1 ton of calcium carbide by-products of calcium carbide is about 400Nm3, and the purity of CO in the tail gas is increased to about 99% by using Peking Pioneer VPSA-CO separation process. The price is about 1.5 yuan; taking an annual output of 50,000 tons of ethylene glycol as an example, the cost per ton of coal-to-gas production enterprises can save about 1,000 yuan, and the annual cost savings can reach 50 million yuan.
-The successful application of calcium carbide furnace gas purification technology-
Xinjiang Tianye Group uses Peking Pioneer's unique pressure swing adsorption technology to separate high-purity carbon monoxide from the exhaust gas of calcium carbide furnace for the synthesis of ethylene glycol. This is the first domestic industrial device to synthesize ethylene glycol with calcium carbide furnace gas. After successfully putting into operation, this device completely solved the problem of recycling of calcium carbide furnace exhaust gas, which not only effectively promoted energy conservation and emission reduction of enterprises, but also greatly reduced the cost of raw materials for high-purity carbon monoxide and saved large gas production costs.
Following the world ’s first industrial CO2 and H2 industrialization plant for the separation of CO2 and H2 from the exhaust of calcium carbide furnaces, Xinjiang Tianye Group's first-phase 50,000-ton / year ethylene glycol project from calcium carbide furnace exhaust was successfully put into operation. In August 2013, in-depth cooperation was reached again, and the pressure swing adsorption purification CO, which was used for the 200,000 tons / year ethylene glycol and 170,000 tons / year 1,4-butanediol project for the comprehensive utilization of Tianye's second-phase calcium carbide furnace exhaust gas was signed. H2 installation supply contract. In view of the smooth commissioning of the first phase of the project and the product indicators are better than expected, Xinjiang Tianye continued to use Peking Pioneer's proprietary technology for the construction of the second phase of the construction of calcium carbide furnace tail gas purification CO, H2 equipment and methanol purge gas In the H2 unit, the obtained CO products are used for the production of downstream ethylene glycol and 1,4-butanediol.