Interview with Engineer Cao:2*280t/h CFB Power Plant Boiler Project in Inner Mongolia
Customer introduction:
Located in beautiful Xilin Gol Prairie--- Ximeng Xiwuqi Baiyinhua Industrial Park(now known as Regional Industrial Park), the Inner Mongolia Xing’an Copper Zinc Smelting Co., Ltd., a joint venture founded in 2007 by Inner Mongolia Mining Group and SPIC Mengdong Energy Group with a registered capital of 300 million RMB, is a non-ferrous metal smelting company, which is specialized in zinc, cooper and sulfuric acid production and trade.
Project background:
The overall design scale of Inner Mongolia Xing’an Copper Zinc Smelting Co., Ltd. is annual production of 200,000ton zinc, 100,000 cooper, and it will totally cover an area of 1,800 acres. The general program is divided into three stages: the first stage has completed; the second stage and technology projects have started and put into production, of which, the 2*280t/h CFB boiler project cooperated with ZG belongs to the 2*50,000KW captive power plant, with a total investment of more than 6 billion.
Engineer Cao, who designed the 280 ton high temperature high pressure boilers
Q: What’s the role of the 2 sets of CFB Boilers in the Inner Mongolia project?
A: There are “three driving force” in the project: boiler, steam turbine, and generator. The 2*280t/h high temperature high pressure CFB Boilers belong to the boiler part and they take a very important position in captive power plant running. The quality of boilers can directly affect the operation of captive power plant, so our CFB boilers are the fundamental equipment in the project.
Q: Why the company builds captive power plant?
A: It is a energy-consumption industry and it consumes enormous electricity every year. The company is located in a coal-rich zone, and there are special policies support from power department and autonomous region. So building a captive power plant is a prior choice to reduce its cost.
Q: This Inner Mongolia power plant boiler project is currently the largest high temperature high pressure boiler project in Henan, and ZG Group even listed it as “NO 1 Project” at that time. For this project, how did ZG deal with the technicians deployment?
A: The whole project is led by the leadership of ZG Group, all departments cooperate and successfully complete the boiler’s design, manufacture, installation and commissioning. To ensure smooth progress of the project, five excellent technical staffs and an experienced site representative were arranged from installation to commissioning.
Q: You said “a 280 ton CFB power plant boiler is equivalent to 320 ton load one”, how can it achieve such a high load?
A: The equipped steam turbine and generator are 2*60,000KW high temperature high pressure double suction air cooling units. Under normal conditions, it is a 2*50,000KW generating capacity, but according to enterprise’s demand for production load electricity, the full load power is 2 * 60,000KW without extraction. So, the boilers are expected to operate safely and stably under 20%-110%B-MCR. At the same time, the generator unit should have the over-load ability. To meet user’s requirements, the boilers are designed of a nominal capacity 280t/h, but the actual outputs can reach 320t/h.
After 168 hours commissioning, the user was very satisfied.
Q: What are the actual benefits that the 2*280t/h boilers can bring to the Inner Mongolia company?
A: The project can basically meet its demand for electricity, saving at least 876 million kilowatts electricity cost every year. Besides, the project fully utilizes the flue gas waste heat of CFB power plant boiler, adopts advanced technologies such as desulfurization washing and degassing, and finally realize the recycle and reuse of smelting waste(zinc oxide). This not only improves zinc metal recovery rate, also completes the recycling of sulfur and other harmful ingredients. The boilers help realize energy-saving, circulating water utilization, comprehensive recycle, and brings huge economic benefit and social benefit.
2*280 ton/hr CFB power plant boiler for co-generation
Q: The two sets of 280 ton boilers joined the grid power successfully in the morning of November 29. Many clients are confused about the grid-generation, so can you give us an explanation? For example, what is grid-connection? When the boiler can join grid power?
A: A power station is generally said to have achieved grid connection when it first supplies power outside of its own boundaries. Before a boiler can join grid-generation, the boiler must operate normally and the main steam parameters (temperature, pressure) must meet the the requirements of steam turbine generator unit, then the boiler can enter into on-load commissioning stage; if the pilot phase is completed successfully, it could eventually be delivered to users, and formally enter into commercial operation for power supply. In fact, success of power generation also means that the final product meets the user's requirements, and we fulfill all contractual obligations.
Q: Does the Inner Mongolia 280 ton power plant boiler belong to thermal power plant?
A: This is a captive power plant project, but serious speaking, it not belongs to co-generation. This project is a little special. This captive power plant is equipped with condensate air-cooled unit, through steam extraction, supplying energy to high and low heating device for raising boiler feed water temperature, to improve the efficiency of the whole generator unit. But when this part of steam extraction is used in heating supply, it can be regarded as co-generation in some degree.
Q: What is co-generation? And what enterprises can use co-generation?
A: Co-generation, also known as combined heat and power (CHP), refers to a group of proven technologies that operate together for the concurrent generation of electricity and useful heat in a process that is generally much more energy-efficient than the separate generation of electricity and useful heat. During industry production, paper-making, steel & iron, chemical and other energy-consumption industry can choose co-generation. Large power plant co-generation can meet industrial boiler load requirement, replace industrial boiler and keep heat supply efficiency. No matter enterprise co-generation or thermal power plant co-generation, the essence is the same, just heating scope and user are different.
Q: Under the trend of co-generation, what are the competitiveness of ZG circulating fluidized bed boiler power plant boiler?
A: Energy Efficient is the core competitiveness of our CFB power plant boiler. The energy efficiency testing data can clear prove the fact. 3% reduction of coal-consumption, 30% power saving, more than 8000 hours annual running time, low SOx, NOx emission, low maintenance cost...
Q: Co-generation is a challenging field for ZG Group. How do you evaluate your company's strength in the sector?
A: The success of the 2*280 ton CFB power plant boiler is a milestone that ZG Boiler has entered and had its place in the field of power plant boiler. 70-year ZG Boiler will go on moving and try our best to design and manufacture better products for our clients! And we believe in the future, ZG’s power plant boiler will be the most trustful products!
