Boiler gas comprehensive utilization and transformation project Lanzhou Fund Application Report Description of writing content:

1、 Necessity and purpose of project construction

1. Encouragement of national industrial policy: according to the Access Conditions for Calcium Carbide Industry (2007) issued by the National Development and Reform Commission in 2007 No. 70 Announcement, enterprises are encouraged to transform the existing internal combustion type into closed type and conduct comprehensive utilization of furnace gas. The existing 3 × 25500KVA internal combustion type calcium carbide furnace gas of Gansu ***** Co., Ltd. is not fully recycled. In view of the national energy shortage and the industrial policy for the carbide industry, Gansu * * * * Co., Ltd. implements this project to achieve the purpose of energy conservation and emission reduction and promote the sustainable development of enterprises.

2. Gansu * * * Co., Ltd. has three 25500KVA internal combustion calcium carbide production lines, with an annual design production capacity of 180000 tons. Its raw materials are mainly quicklime and semi coke. Among them, the annual demand for qualified raw materials is about 190000 tons of quicklime, all of which are produced and supplied by our company in the lime kiln in the official quarry of Minle, Yongdeng County. The technical level is low, the product quality and output are unstable, the annual consumption of standard coal is 27400 tons, and the cost of raw materials is high.

3. The company has formed a production scale with an annual output of 180000 tons of calcium carbide (3 sets with a total capacity of 76500 kVA). According to FGHZ [2006] No. 1457 Opinions on the Implementation of Ten Key Energy Conservation Projects during the Eleventh Five Year Plan Period and the reading of the implementation opinions, and the National FGHZ [2006] No. 1457 Opinions on the Implementation of Ten Key Energy Conservation Projects during the Eleventh Five Year Plan Period, After the internal combustion type calcium carbide furnace is transformed into a closed type calcium carbide furnace, the batching and feeding are continuous and automatic, which can optimize the electrical efficiency and thermal efficiency of the calcium carbide furnace, reduce the unit calcium carbide power consumption from about 4%, and realize the safe, high-yield and long-term operation of the calcium carbide furnace; Each ton of calcium carbide produced by closed calcium carbide furnace can produce 400Nm3 of usable furnace gas. Based on the annual output of 150000 tons of calcium carbide produced by our company, at least 60 million Nm3 of furnace gas can be converted into usable energy annually.

4. The project is mainly to use the current domestic mature closed technology of calcium carbide furnace to carry out closed transformation of the existing three 25500KVA internal combustion calcium carbide furnaces, and use calcium carbide furnace gas to burn raw lime for calcium carbide production, so as to achieve the purpose of comprehensive utilization of tail gas and energy conservation.

2、 Project construction content and the advancement of product technology and equipment

1. Project site selection: the project is a technological transformation and is built in the original site of the enterprise.

2. Construction scale: The original planned investment of the project is 69.687 million yuan, including 68.499 million yuan of fixed asset investment and 13 million yuan of additional investment.

3. Transformation content: three 25500KVA internal combustion calcium carbide furnaces are sealed with mature calcium carbide furnace sealing technology; Three new lime kilns with a daily output of 200 tons of gas and coal will be built; The conductive short net and electrode system of three calcium carbide furnaces were modified by using the combined controller technology; Transformation of tail gas dedusting system of three calcium carbide furnaces; Two new 250 t/d coke drying rotary kilns will be built;

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