With the elimination of low-power calcium carbide furnaces and open calcium carbide furnaces, is the spring of natural gas acetylene production coming? ?
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The "Action Plan for Strict Energy Efficiency Constraints in Key Petrochemical and Chemical Industries to Promote Energy Conservation and Carbon Reduction (2021-2025)" was issued. The "Plan" proposes to guide the orderly exit of inefficient production capacity. Strictly implement the "Industrial Structural Adjustment Guidance Catalog" and other regulations, and promote the elimination of refining units with a capacity of 2 million tons/year or less, natural gas atmospheric pressure intermittent conversion process to produce ammonia, and calcium carbide furnaces and open calcium carbide furnaces with a single furnace capacity of less than 12,500 kVA.
1. The calcium carbide method is produced by the interaction of calcium carbide (calcium carbide) and water. The reaction between calcium carbide and water is quite intense, and a separatory funnel can be used to control the amount of water added to adjust the gas outlet speed. Saturated salt water can also be used. After the test is completed, acetylene is collected using the drainage gas collection method. The chemical equation is CaC2+2H-OH→Ca(OH)2+C2H2↑. 2. Natural gas method. Raw natural gas and oxygen preheated to 600-650℃ enter the multi-tube burner plate acetylene furnace. At 1500℃, methane is cracked to produce about 8% dilute acetylene, which is then concentrated with N-methylpyrrolidine to produce 99% acetylene finished product.
As far as the natural gas acetylene technology that has been industrialized is currently used, the main product is actually synthesis gas, and the by-product is acetylene. Each standard cubic meter of acetylene co-produced syngas produced is about 11 to 15 standard cubic meters (there are differences in technology between Sichuan Wei, BASF and Ukraine). Therefore, in terms of economics, it is important to consider what products are produced by co-producing syngas.
The "Chemical Industry Action Plan" proposes that the benchmark level of energy consumption per unit product of calcium carbide should reach 940 kilograms of standard coal/ton, and the benchmark level should reach 805 kilograms of standard coal/ton. The overall energy efficiency level of the industry has been significantly improved, the carbon emission intensity has been significantly reduced, and the green and low-carbon development capabilities have been significantly enhanced.
Mainly, the 400,000 tons/year natural gas acetylene process PVC needs to be equipped with a 1.2 million tons/year methanol unit or a 700,000 tons/year ammonia synthesis unit, which will significantly affect the investment decisions of chlor-alkali companies and the methanol and PVC markets.
Is it now 400,000 tons? ? ? ?
It refers to PVC production capacity. Acetylene-based PVC belongs to the restricted category regardless of its scale. In principle, the requirement is equal replacement of technological improvements (retiring the old and building the new). Approval for new construction and expansion projects is extremely difficult. In recent years, the scale of new construction has generally been above 300,000 tons/year, with 400,000 tons/year projects being more typical.
I happened to see a 400,000-ton calcium carbide production project online.