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Ash Handling

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.

Recently, we learned, Shaoxing City, Zhejiang Province People's Government Office issued the "coastal city 2018--2019 autumn and winter tackling air pollution comprehensive management action plan", as follows.

Less adopt comprehensive measures to reduce coal total coal consumption, coal consumption in 2018 to ensure that the total amount of negative growth. New non-owned coal-fired units, the implementation of new large-scale coal-fired units and coal consumption capacity equal or reduction alternative.

Optimize the use of natural gas structure, in principle, to new natural gas cogeneration and gas chemical projects, gas will adhere to the reform, orderly manner "coal to gas" project.

Carry out boiler (with tea furnace, operating a stove, grain storage and drying equipment, coal-fired facilities) an intensive investigation to establish accounting and inventory management, to develop a comprehensive remediation program in accordance with the unified deployment requirements boiler city, according to the law in accordance with regulations to increase fuel coal boiler out of efforts to achieve all cleared 10 steam tons / hour and coal-fired boilers to prevent high-polluting fuel boiler rebound has been eliminated. Boiler registration strictly prohibit new steam per hour 35 tons / hour of coal-fired boilers, coal-fired boilers new emission concentration to meet ultra-low emission of air pollutants, strict control of new biomass boilers, coal-fired boilers embodiments and low nitrogen urban built-up area of ​​ultra-low emission biomass boilers transformation.

Oven gas hot water boiler power generation sales england boiling out any difference in the boiling gas hot water boiler steam boiler furnace substantially similar, but the difference is as follows: ① boiler water temperature controlled at 95 ℃. ② bleed valve should be open all the way, if the steam discharged from the purge valve, the valve should be boiler feed water to release the water so far. Oven gas hot water boiler steam boiler are substantially similar, but the difference is as follows: ① medium and large hot water boiler heating system may not together with, the oven may be a small hot water boiler with a heating system. ② end stage oven boiler water temperature should not exceed 95 degrees. ③ Because no water table, the water level can not monitor, in advance to connect to the water pipe boilers, boiler feed water after the water pipe up to the discharge.

Fourth, boiler power generation sales england emissions

Boiler, fuel combustion, emissions will inevitably occur. Our country attaches great importance to air emissions of pollutants, environmental policy after another, contaminants in the boiler selection, must be produced as a criterion of choice. Therefore, enterprises in the choice of heating boilers, to be issued in accordance with local air pollution emissions requirements, select the appropriate boiler products.

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