commercial hot water boiler ebay
There are eight bed ash drains, consisting of vertical pipes which extend through the furnace floor. The bed material is cooled in water-cooled screws located under the furnace windbox at each drain. The solids drain flow rate is controlled by the rotational speed of water cooled screws. While fluidized bed ash drain coolers have been specified for a number of boilers having high ash, water cooled screws were selected for this project. The choice between a fluidized bed ash cooler and screw cooler was carefully examined. The advantage of a fluidized bed ash cooler in utilizing the sensible heat in the bottom ash is offset by several disadvantages: a) in the case of anthracite schtib firing, there is a possibility of temperature excursions in the cooler due to carbon burnout leading to agglomerate formation, and b) a considerable amount of cooling air/flue gas is needed which can affect boiler performance. With multiple screw coolers, there is redundancy allowing for repairs to be made with the boiler on-line with little or no reduction of boiler capacity. Secondary separator recycle. The solids collected in the multi-cyclone are recycled to the furnace side wall injection nozzles at the required rate using air-assisted conveyors. One air-assisted conveyor serves two multi-cyclone hoppers. The flow rate to each conveyor is controlled by a variable speed feeder installed between the hopper discharge connection and the conveyor inlet. Control algorithms determine the aggregate quantity of solids to be recycled to meet furnace performance requirements and the flow rate from each hopper required to accommodate non-uniform distribution of solids from hopper to hopper. Excess solids are removed from the system when required by means of overflow pipes in each hopper. Solids from the overflow pipes are sent to disposal via the plant ash removal system.
Water Tube Boiler
Water tube boiler is reverse of the fire tube boiler. In water tube boiler the water is heated inside tubes and hot gasses surround these tubes.A water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them.
The most common problem is that boiler water treatment is not implemented. At present, some boilers are often ignored because of their small capacity or are used only in winter, and those who manage small boilers often do not have enough experience in the treatment of boiler water. In the process of boiler management, there is no effective boiler water treatment to the small boiler, which makes the boiler scale or corrosion, which has a serious impact on the boiler management for a long time.
Recently, Taiyuan, Shanxi Province Environmental Protection Leading Group issued a circular on promoting the transformation of ultra-low emissions and low nitrogen transformation of biomass boilers gas-fired boiler. Resolutely implement - the latest requirements "2018 in Beijing, Tianjin and the surrounding areas in 2019 autumn and winter tackling air pollution comprehensive management action plan" in, and further reduces boiler emissions standards.
1, 2019 until October 31, the use of boiler tail decoration efficient dust removal, desulfurization, stock device is accomplished ultra-low emission biomass boilers transformation of the necessary funds by the counties (cities, districts) and users together to solve, not the municipal finance I grant.
2, October 31, 2019 update for ultra-low emissions of nitrogen gas boilers, electric boilers biomass boilers, municipal finance one-time grant 30 yuan / square meter construction costs, in part by the lack of counties (cities, districts) and user common solutions.
Way: by transformation to replace the low NOx combustion, a flue gas recirculation device installation mode, NOx emission is less than 30 mg / m item.
NOx emission cuts ≥50%, and the concentration value of less than 30 mg / cubic meter project, to give up prize money of 30% in accordance with the transformation of investment.
3, after December 31, 2017 the new gas boiler, should meet the emission requirements on Taiyuan low NOx combustion, but does not enjoy the low NOx combustion subsidies.