Must look at whether the model that corresponds to the time to pay attention to what front-end work in the choice of condensing boiler plant and accessories, when the system or choose a condensing boiler, different manufacturers product specification are great differences, and condensing boilers Brand Model Size itself is difficult to enumerate the many, so before purchasing professionals should be consulted in advance to consider their own condensing boiler brand, model specifications, so in addition to custom or condensing boilers choose when to pay attention to what it? First, the working condition in case of condensing boilers due to the manufacturing process in which the use of technology and raw materials have some differences, so the purchase of such, when the product you must pay attention to how the main condensing boiler working environment, such as a major environmental corrosive environments, need to consider corrosion during pre-production, such as humidity, moisture coefficients need to be considered in advance in the operating environment conditions. Second, the intensity of work though professional condensing boilers are mostly used in the service sector, but the frequency of use of different enterprises of different, such as some condensing boilers work intensity, at the time of purchase must be required to work intensity guaranteed to avoid frequency too large cause damage condensing boiler, the work apparatus difference is also reflected in the condensing boiler different working strength. Third, the table material type by professionals who understand condensing boiler they use steel production, but added amount of each component in steel also significantly different, we should focus on to distinguish the types of steel procurement condensing boilers, regardless of the intensity of the work are recommended to choose high-quality steel condensing boiler material, the service life of such boilers to be generally higher than ordinary products, in addition to considerations beyond its material but also the focus of discretion table inside the component materials. At the same time good after-sales condensing boiler manufacturers also suggest that you and specifications on these devices need to have professionals do focus on brands such as appropriate depending on the product, but you also need to understand the overall demand for the device, if higher requirements for condensing boilers, We need to work technology, process and detail design standards etc, so in appearance and specifications are in line with the relevant requirements.
It is reported that Shandong Province to further promote the action of atmospheric pollutants governance, but also to "defend the blue sky strategy" escalating, the Shandong provincial government amended the new "Regional Air Pollutant Emission Standards" and other three local standards, as the province's mandatory local standards of environmental protection, on November 1, 2019 formally implemented.
1, to improve the standard index-related emissions, can improve the level of clean production, reduce pollutant emissions, Forced out of high-emission equipment, improve air quality. The revised standard canceled the densely populated high-polluting industries sewage privilege, the use of emissions phased strategy partition; divides a region of Shandong Province as the core focus, and general control zone, different regions perform different emission limits, based on the location of the enterprise partitioning control requirements.
2, a new round of defense blue sky "Strategy" will be ultra-low emissions standards covering all coal-fired boilers in Shandong Province, and will gradually promote the non-coal industry, requires iron and steel, coking industry emissions to meet ultra-low emission standards. Key building materials industry emissions control area cement, ceramics, lime, glass, etc. are also required to achieve ultra-low emission standards, the general control zone cement, ceramics, glass and other building materials industry emission requirements more stringent than the national standards.
3, changes in air pollutant emission standards in the current round of revisions is the biggest "air pollutant emission standards iron and steel industry." The new revised standard will help eliminate a number of small-scale, backward technology, compliance governance hopeless small-scale iron and steel enterprises, and guide the existing steel enterprises discharge standards by clean energy alternatives, etc., so as to promote Shandong Province, energy, industrial restructuring, improve the quality of atmospheric environment.
4, according to monitoring data, 2018, Shandong fine particulate matter (of PM2.5), particulate matter (of PM10), sulfur dioxide (SO2), (NO2) average concentration of nitrogen dioxide fell 14.0%, 8.5%, 33.3 %, 2.7%; the number of days of heavy pollution fell for 5 days. Wherein the fine particulate matter (of PM2.5) than the average concentration of 2013, 2015 decreased 50.0%, 35.5%.
According to the "2013 Shandong Province - 2020 air pollution control plan" in 2020, the province's basic ambient air quality standards, compared with 2010 improved by 50%. Since 2013, Shandong "broken wrist" environmental pollution, has released various standard 102.
Combustion air staging the first stage fuel rich combustion, excess air is added in the second stage, the lean burn combustion, the air is cooled between the two was added to ensure that the combustion temperature will not be too high. 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. (2) lean premixed combustion technology refers premixed combustion 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. (3) internal and external flue gas recirculation to reduce the combustion temperature of flue gas recirculation techniques may be implemented by adding a flame zone in the flue gas, the flue gas is added to reduce the combustion temperature of the endothermic.
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