Recently, Nanchang, Jiangxi Province to fully implement the national environmental protection work conference and the province's environmental protection work conference, combined with the actual situation of the city, issued a "blue sky Nanchang win the Battle of three-year action plan (2018-2020 years)" (referred to as " plan"). "Plan" put forward a management plan for major air pollution problems.

As the relevant departments to actively promote the utilization of clean energy. The city gradually reduce the proportion of coal consumption, by 2020, coal accounted for the proportion of energy consumption dropped to below 65%; principles and has gradually increased the proportion of natural gas energy consumption, adhere to "the electric power should", "should air the gas" to promote natural gas work to build the pipeline, steadily "coal to gas" project.

2018, the main city of Nanchang to the new area, the main city area and open small blue through the open area to expand the range of city ban on burning areas. By the end of 2020, Nanchang County, Jinxian, Anyi required scoping combustion zone ban within the jurisdiction of, and informed consent of the uniform implementation of the municipal government.

"Plan" put forward in 2018, the main city of the new areas into the combustion zone ban, the main city through the open area and a small blue through the open area phasing out the 10 steam tons / hour and coal-fired boilers; 35 tons of steam launch built-up area / out of hours and coal-fired boilers. As of 2020, the city built basically out of the region 10 steam tons / hour and coal-fired boilers, coal-fired boilers within 10-35 tons of steam / hour range is substantially complete alternative clean energy sources, and no longer approve new 10-35 steam tons / hour of coal-fired boilers.

How to reduce the combustion temperature gas boiler Henan conventional low NOx combustion technique is mainly about how to reduce the combustion temperature to reduce thermal NOx generation undertaken Henan gas boiler main techniques include staged combustion, premixed combustion, flue gas recirculation, catalytic combustion porous media and flameless combustion. A, or fuel staging combustion air staging combustion thermal NOx generation largely depends on the combustion temperature. The equivalent ratio of the combustion temperature in the case where 1 is the highest, burned under lean or rich combustion cases, the combustion temperature will be much lowered. Using this principle has developed a staged combustion technology. Henan air staged combustion of gas boiler is a fuel rich combustion of the first stage, the second stage addition of excess air, the combustion is lean, the cooling air is added between the two to ensure that the boiler will not be too high combustion temperatures. Combustion air staging and fuel staging combustion contrary, with the first stage fuel lean combustion, fuel is added in the second stage so that the equivalent ratio required value is achieved. These two methods will eventually cause the excess air ratio of the entire system to maintain a constant, low nitrogen currently widely used as combustion control technique. Second, the premix lean premixed combustion technology Henan boiler combustion gas refers to fuel and oxidant completely mixed at the molecular level before the mixture is ignited. For controlling the generation of NOx, this technique has the advantage of controlling the combustion temperature can be achieved by fully controlling the equivalent ratio, thereby reducing thermal NOx formation rates, in some cases, partially premixed and the premixed combustion than non-premixed 85% -90% of combustion to reduce NOx production. Further, the premix can also be reduced completely to reduce the excess air ratio due to unevenness caused by generation control of NOx. However, premixed combustion technology there are still unresolved technical difficulties on the security control: First, because of its highly combustible premixed gas may cause tempering; the second is too high excess air ratio will lead to an increase in exhaust losses , reduces the thermal efficiency of the boiler.

Boiler heating surface reasonable transformation: the transformation of the boiler heat transfer surface reasonable: 1, horizontal boiler furnace arch demolition of the existing furnace, gas stove on the bed insulation and refractory bricks, transformed into a secondary radiation surface. Radiation at the furnace bottom can build stack, mounted in an upper portion of the furnace for vertical boiler radiation Arch. 2, controlling the amount of leakage of the furnace and the flue. Viewpoints boiler fire sealing of the boiler and flue duct seal transformation, particularly brick of the flue duct and the large amount of air leakage, after the burning gas, must be sealed, preferably to metal flue. When multiple boilers share a total flue partition to be provided on the partition means each boiler flue, preventing the boiler furnace flue gas and the residual gas flowing into the purge process to stop running.

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