User talk:Merrylyr

May 2015
Hello, I'm Andy Dingley. I wanted to let you know that I undid one or more of your recent contributions to Firetube boiler because it did not appear constructive. If you would like to experiment, please use the sandbox. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Andy Dingley (talk) 09:15, 27 May 2015 (UTC)

Circulating fluidized bed combustion technology research and development
Circulating fluidized bed combustion technology is developed in the last two decades a new generation of combustion technology, is considered to be innovative coal combustion technology has been widely used in the world. The technology is based on the first-generation overcome bubbling fluidized bed combustion technology on its high ash content and low combustion efficiency heating surface pipe wear serious disadvantages inherent low sorbent utilization and development. This combustion furnace substance is run under a special state flow characteristics, the furnace section finer particles are carried through the furnace flue gases, part of the solid particles generated reflux is carried out particles were then returned to the furnace gas-solid separator Repeated burning, multiple cycles. As the circulating fluidized bed desulfurizer fuel and recycled many times, repeatedly burning and reactions, and the furnace movement strong turbulence, which can achieve the desired desulfurization efficiency and combustion efficiency. It is currently the circulating fluidized bed boiler show that has the following characteristics: (1) high combustion efficiency; circulating fluidized bed combustion efficiency of different coals can reach more than 98 to 99%, when burning coal combustion efficiency better same with the pulverized coal furnace, fueled with low-quality coal combustion is more efficient than a Pulverized; (2) to control the discharge of pollutants; incorporation of limestone make Ca / S molar ratio of 1.5 to 1.7, the desulfurization efficiency up to 90% above, the use of oxygen combustion and staged combustion technology enables the NOX emissions below 200ppm; Canton (3) fuel adaptability; fuel preparation and feed system is simple; circulating fluidized bed boiler not only with traditional pulverized coal furnace combustible, layer burning stove can be fueled with various fuels, and can be fueled with pulverized coal furnace, layer burner and a variety of difficult burning fuel. (4) load regulation than large; run the operating flexibility; circulating fluidized bed boiler for combustion of the fuel in the absence of minimum load of up to 25% of rated load, load change rate of up to 5% of the load per minute; (5) in favor of ash utilization; fuel cycle in the bed are "low" burning, ash suitable for use as cement mix or other material; (6), moderate investment and operating costs; investment and operating costs circulating fluidized bed boilers and conventional pulverized coal fired close but lower than a Pulverized configuration desulfurization unit 15 to 20%.

Zhejiang University in the early 1960s opened fluidized bed combustion technology research, it is the first one of the fluidized bed combustion technology research unit. Since the late sixties to carry out research and development of twin fluidized bed boiler, according to China's economic development needs, but also has research and development of the coal washing mud fluidized bed combustion technology, without additives of cheap coal slurry fluidized bed combustion technology, pulse stream fluidized bed combustion technology, circulating fluidized bed combustion technology and circulating fluidized bed combustion technology. These techniques not only can burn a variety of high-quality fuel, can also be fueled with coal, coal washing mud, waste rock and other low-grade fuel, and thus make full use of China's coal resources are of great significance. Institute for Thermal Power Engineering, Zhejiang University in sixty-five, seventy-five results achieved during the international level or six international advanced level in the field of research. As seventy-five national scientific and technological project "35t / h coal washing mud fluidized bed boiler developed" in Shandong Xinglong Zhuang Jianli international's first direct burning coal washing mud 6000kW thermal power stations, to run in 1994 has accumulated 6000 hours, coal Mud combustion efficiency of over 96%, boiler efficiency of 84%, the national identification that reached the international advanced level. The success of the project to solve the slime of nearly 10 million tons annually outlet, have significant socio-economic and environmental benefits. In this research, international cooperation in scientific research Institute of Thermal Engineering, Zhejiang University and the famous boiler manufacturers (such as Sulzer companies) and research institutes is very active, as with the Swiss Sulzer company signed a five-year long-term cooperation projects.

In the mid-1980s, Zhejiang University in the original fluidized bed combustion technology, based on research and development of circulating fluidized bed combustion technology. Zhejiang University has developed four steps of cross-cutting, the first is the establishment of a circulating fluidized bed cold test station, and then in the cold test bench for fluid dynamics simulation circulating fluidized bed; the second is in the above-mentioned cold established on a trial basis circulating fluidized bed thermal test station, and experimental study of a circulating fluidized bed combustion characteristics, heat transfer characteristics and properties to reduce pollution emissions, and to establish a comprehensive model of a circulating fluidized bed boiler, the theory computing; The third step is based on the design of the above test demonstration circulating fluidized bed boiler, a well-designed method of circulating fluidized bed boiler, and the development of new circulating fluidized bed boiler; The fourth step is to promote the circulating fluidized bed boiler, the accumulation of operating experience, the circulating fluidized bed boiler and pulverized coal boiler has the ability to compete.

Circulating fluidized bed combustion mechanism in technology research, it has undertaken a "research and test modeling and numerical simulation of large-scale circulating fluidized bed combustion system working process," nearly ten National Natural Science Foundation, the national "eight five" key project and "circulating fluidized bed steam generation equipment gas research," national "Nine Five" project "10MW circulating fluidized bed package design," and the National Key Basic Research Development Program projects. In collaboration with Canadian institutions concerned to the Canadian joint application to the Canadian International Development Agency CIDA Project "to develop combustion technology research with the Chinese coal combustion circulating fluidized bed", made a series of achievements in scientific research, especially in the circulating fluidized bed combustion, heat transfer, desulfurization and other aspects of a deeper study, in cooperation with the United Technologies Corporation a "vortex fluidized bed combustion technology research", in cooperation with the US F & W company "a new gas-solid separation technology research." Cooperation with the South Korean development of large circulating fluidized bed boiler. In a lot of research work on the basis of the mechanism for circulating fluidized bed combustion technology with sufficient knowledge, especially in the hydrodynamic characteristics of circulating fluidized bed, a circulating fluidized bed coal and special fuels (anthracite, coal, coal gangue, Health biomass fuels, coal, petroleum coke, etc.) of the combustion characteristics of a circulating fluidized bed furnace heat transfer characteristics and tail heating surface, the control process pollutants (SO2, NOx and heavy metals) circulating fluidized bed combustion, circulating fluidized Key components such as splitters bed, feed back mechanism and external fluidized bed heat exchanger. At present the main fluidized bed combustion test rig owned are: cross-section of 200 × 200 high as 4000 cold circulating fluidized bed test bed cross-section of 200 × 200 high of 4000 circulating fluidized bed thermal test bench, sectional as high as 500 × 500 6000 circulating fluidized bed thermal test bench, cross-section of 350 × 350 high as 10,000 hot circulating fluidized bed test bed 1MW fluidized bed combustion test stand and vortex. In addition to research in the laboratory scale test rig performed, still 75t / h circulating fluidized bed boiler and 220t / h circulating fluidized bed boiler exhaustive testing, to obtain large flow boiler, combustion, heat transfer, pollutant Characteristics of emissions.

On the basis of circulating fluidized bed technology research on the mechanism of combustion, circulating fluidized bed combustion technology theoretical research system, the establishment of a comprehensive mathematical model, put forward a complete design calculation method of circulating fluidized bed boiler, and the design and development of a multi- forms fired circulating fluidized bed boilers of various fuels, such as 35t / h Coal fired circulating fluidized bed boiler, 35t / h slime gangue fired circulating fluidized bed boiler, 35t / h, 75t / H and 130t / h Coal fired circulating fluidized bed boiler, 35t / h circulating fluidized bed combustion boiler with garbage, 10t / h fueled with coffee grounds circulating fluidized bed boiler, 35t / h fueled with rice circulating fluidized bed boiler shells, 35t / h coal-fired circulating fluidized bed boiler stone, 75t / h burning bituminous coal high temperature cyclone CFB boilers and other forms of boilers, these boilers have been applied to industrial real for many years, and has been a large scale. Meanwhile eligible for more than 20 patents in the field, where the slime circulating fluidized bed combustion technology access to national Invention. Currently, with the Harbin Boiler Works, Dongfang Boiler Factory work together to complete a 410t / h circulating fluidized bed boiler design and development work, has entered the stage of promotion.