褐煤泥干燥机，降低电厂排放，降低消费成本

实用程序在全国范围内看到产生和发送电力的成本的增加。批发电费高于往年8-10％，成本上升是一个行业的发展趋势 - 其中一个，将不会很快结束。

一个动力源，可以减轻该问题是褐煤，通常被称为作为褐煤，具有介于烟煤和泥炭。

褐煤是更容易转换成比排名较高的煤的气体和液体石油产品，但它是多雨，更容易受到自发combustrion。这显然会导致在运输和储存的问题。一些进程可以消除潜在的水分锁定在褐煤，自燃的风险越低的黑煤，而把它变成一个黑色的煤当量燃料。

明尼苏达州的电力能源供应商，大河能源，Heyl & Patterson更进了一步，并提供了一个可持续发展，能源浪费降低成本的解决方案，利用褐煤和提高电厂的效率，同时干燥和完善。这个过程被称为DryFining，或褐煤燃料增强。

Heyl & Patterson定制设计与褐煤干燥，从38％到29.5％，利用现有的和以前浪费的能量从电厂流化床干燥机。

该项目始于一个原型机，后来扩大到8流化床干燥机。

设计为处理自由流动的材料，如矿物，化学品，塑料，木制品，谷物和废物，悬浮在空气或气体的上升流，流化床干燥器使用能量高效的流化的方法，该方法使物料像一个流体。这提供了一个高的传热速率，同时轻轻地处理的固体。它还能降低资本设备和运营成本，全自动化操作的结果，其效率的计划控制系统集成到了。

这个概念是干燥褐煤使用相结合的直接和间接加热，然后才在电厂锅炉燃烧。使用废热从发电厂我们能够提高它的热值，这反过来又使电厂操作更有效地干燥的煤。总体而言，该过程降低客户的氮氧化物（NOx）的20％，35％的二氧化硫（SO 2）的排放量，并显着减少的二氧化碳（CO 2）和汞，以及他们的整体的维护成本。已处理超过40万吨的褐煤通过原型，没有显着的操作或维护问题。

该项目已取得了巨大成功，大河能源。

据能源部（DOE）项目部发表的一份声明，“技术经济捕获和使用已经被该厂生产的煤炭去除水中的余热。通过降低水分含量，需要较少的煤生成相同数量的电力，这意味着较少的排放量和较低的排放控制成本。“

2010年，DryFining的团队被评为年度电力工程公司的燃煤发电项目。 Heyl帕特森和他的团队^的大河能源，该小组还包括部，能源部国家能源技术实验室，利哈伊大学能源研究中心，电力科学研究院和工程建设承包商WorleyParsons的。

heyl＆Patterson的Renneburg司工程师一些市场上^有效的和成本有效的干衣机中，在^上^大的流化床干燥机，并且。该产品系列还提供了旋转式干燥机，分解炉和热处理器到^各地的客户。

Lignite Drying Reduces Power Plant Emissions, Lowers Consumer Costs

Utilities across the country are seeing increases in the cost of generating and transmitting electricity. With wholesale power bills 8-10% higher than previous years, rising costs are an industry trend – and one that won’t be ending soon.

One power source that can alleviate the problem is lignite, often referred to as brown coal, which has characteristics somewhere between bituminous coal and peat.

Lignite is easier to convert into gas and liquid petroleum products than higher ranking coal, but it is wetter and more susceptible to spontaneous combustrion.  This obviously causes problems in transportation and storage.  Some processes can remove the latent moisture locked within lignite, and lower the risk of spontaneous combustion to that of black coal, while transforming it into a black coal equivalent fuel.

For Minnesota-based electric energy provider Great River Energy, Heyl & Patterson went one step further, and provided a sustainable, cost-reducing solution utilizing waste energy to simultaneously dry and refine lignite and increase the efficiency of the power plant.  The process is called DryFining, or Lignite Fuel Enhancement.

Heyl & Patterson custom-engineered a Fluid Bed Dryer to work with lignite coal and dry it from 38% to 29.5%, utilizing existing and previously wasted energy from within the power plant.

The project began with a single prototype dryer and was later expanded to eight Fluid Bed Dryers.

Designed to process free-flowing material, such as minerals, chemical, plastics, wood products, grain and waste, suspended in a rising flow of air or gas, Fluid Bed Dryers use an energy efficient fluidizing method that causes the material to act like a fluid.  This provides a high rate of heat transfer while gently handling the solids.  It also provides lower capital equipment and operating costs, with fully automated operation that’s integrated into the plan control system as a result of its efficiencies.

The concept was to dry lignite using a combination of direct and indirect heating, before it is burned in the power plant boiler.  Using waste heat from the power plant we were able to dry the coal raising its heating value which in turn makes the power plant operate more efficiently. Overall, the process lowered the customer's nitrogen oxide (NOx) by 20%, sulfur dioxide (SO2) emissions by 35% and significantly reduced the carbon dioxide (CO2) and mercury as well as their overall maintenance costs.  Over 400,000 tons of lignite coal has been processed through the prototype with no significant operating or maintenances issues.

The project has been a tremendous success for Great River Energy.

According to a statement issued by the Department of Energy (DOE) regarding the project, “the technology economically captures and uses the waste heat already being produced by the plant to remove water from the coal. By reducing moisture content, less coal is required to generate the same amount of electricity, which means fewer emissions and lower-emission-control costs.”

In 2010, the DryFining team was awarded Power Engineering’s Coal-Fired Project of the Year.  Aside from Heyl & Patterson and team leader Great River Energy, the team also included the the Department of Energy's National Energy Technology Laboratory, the Lehigh University Energy Research Center, the Electric Power Research Institute and engineering construction contractor WorleyParsons.

Heyl & Patterson’s Renneburg Division engineers some of the largest Fluid Bed Dryers in the world and are among the most efficient and cost effective dryers on the market. The product line also provides Rotary Dryers, Calciners and Thermal Processors to customers around the world.