Zhejiang University of Technology Production Internship Report

College: College of Education and Science

Class: Building Materials 0601

Name: Tong Jianbin

Instructor: Ying Debiao Qiu Qiong

Internship location: Ningbo Kehuan New Building Materials Co., Ltd.

Internship time: July 16, 2008 - July 26, 2008

1. Internship Objectives

The purpose of the production internship is to enable students to understand the production process, production equipment and production organization of the factory Institution, through production internships, master the specific production process of cement materials, master the formation process of cement clinker, master the working principles and functions of various production equipment, lay perceptual knowledge for subsequent professional course study, and at the same time understand the society, cultivate independent thinking, Ability to work independently and collect necessary information and data for future graduation projects.

2. Company Profile

Ningbo Kehuan New Building Materials Co., Ltd. (formerly Ningbo Shunjiang Cement Co., Ltd., English name NINGBO KEHUAN NOVEL BUILDING MATERIAL CO., LTD.), located in Located in the northern suburbs of Yuyao City, Zhejiang Province, it was founded in 1975. So far, it is a large-scale cement enterprise covering an area of ??more than 400 acres. It is a backbone enterprise under the listed company Ningbo Fidelity Co., Ltd. It has 562 employees and fixed assets of 638 million yuan. The company has passed ISO9001 quality management system certification and ISO14001 environmental management system certification. It has been awarded the title of Zhejiang Famous Trademark and Ningbo City Famous Trademark. It is a green enterprise in Zhejiang Province and one of the top ten energy-saving and emission-reduction enterprises in Zhejiang Province. An advanced energy-saving enterprise in Zhejiang Province that is a benchmark enterprise, the "Shunjiang" brand cement produced is a national inspection-free product and a Zhejiang famous brand product.

2.1 Corporate culture

Enterprise spirit: efficient, pragmatic, striving for transcendence

Quality policy: preferred procurement, optimized operation, high quality factory delivery and excellent service

2.2 Enterprise Advantages

Production scale - The company has a new dry process cement production line with a design scale of 2500t/d, and the actual production capacity has reached 3000t/d. It is the second batch of national "double high and one excellent" projects. Currently The only new dry process cement production line in Ningbo City, it has an annual cement grinding capacity of 2 million tons and an annual slag powder production capacity of 400,000 tons. The main sales place is Ningbo area.

Product types——

■ General cement: ordinary Portland cement, composite Portland cement, Portland cement clinker, etc.

■ Special cement: marine cement, road cement, pipe pile cement, low-alkali cement, emergency repair cement, medium and low heat cement, grouting cement, etc.

■New building materials: slag powder, composite cementitious materials.

Main product characteristics——

■ General cement: stable performance, small fluctuation, high strength, workability and adaptability to admixtures.

■ Marine cement: high resistance to chloride ion penetration, low heat of hydration, impermeability, anti-freeze, and micro-expansion.

■ Pipe pile cement: No need for pressure steaming, pipe pile strength reaches C80 or above, good hammer resistance, excellent construction performance, shortens the pipe pile production cycle, and significantly reduces pipe pile production costs.

■ High-performance concrete formulated with high-performance slag powder and ordinary cement has high fluidity, high strength, high wear resistance, high durability, and excellent resistance to chloride ion (CI-) penetration.

Cleaner Production - The company is one of the first batch of resource comprehensive utilization enterprises in Ningbo City and the first batch of cleaner production audit pilot enterprises in Zhejiang Province. In order to reduce pollutants from the source, all raw material storage and conveying equipment in the production line are closed. According to monitoring by the environmental protection department, the exhaust gas emission concentration is below 20mg/m3 under standard conditions, which is far lower than the national standard of 100mg/m3. , unorganized emissions have also been effectively controlled. While achieving clean production in the cement production process, we actively utilize solid waste resources, including fly ash, slag, cinder, coal gangue, etc. There are more than ten categories, with an annual utilization of nearly 1 million tons. The company has also been awarded the honorary titles of Zhejiang Province Green Enterprise and Zhejiang Province Advanced Typical Pollution Control Enterprise.

Circular economy - the company is at the forefront of solid waste disposal in China.

With the support of the Ningbo Municipal Environmental Protection Department, the company cooperated with the China Building Materials Research Institute, Tsinghua University and other relevant units to conduct experimental research on the "harmless comprehensive utilization of heavy metal-containing industrial sludge" project, so that industrial sludge from the electroplating and stainless steel industries can be High-temperature treatment in a cement rotary kiln will not cause secondary pollution to the environment. It is the only company in Ningbo that uses a new dry process cement kiln to dispose of industrial waste. Transforming the company from a pure cement production enterprise to a unit that specializes in the disposal of solid waste, including hazardous solid waste, has become an important link in the construction of an ecological city in Ningbo. It has been selected into the China-Norwegian Cooperation "China Hazardous Waste and Industrial Waste Cement Kiln ***Disposal Environmentally Sound Management" project demonstration cement enterprise.

Energy Saving and Consumption Reduction——

■ In 2006, the company was listed by the National Development and Reform Commission as one of the “Thousands of Energy Saving Action” enterprises nationwide.

■ The first pure low-temperature waste heat power station in Ningbo was built using the waste heat from the kiln head and kiln tail of the new dry process cement rotary kiln. The annual power generation reached 28.08 million kwh. The standard coal volume is nearly 10,000 tons.

■ Equipped with four sets of circulating water treatment systems, the circulation rate reaches over 96%.

■ Equipped with a lubricating oil filtering system to recycle waste and dirty oil, saving more than 100 tons of lubricating oil annually.

■ Utilize the waste heat of kiln clinker to dry slag, fly ash and other mixed materials, saving 2,880 tons of standard coal per year