According to relevant data, with the speeding up of changing coal to gas, the project that change industrial coal-fired boilers to industrial gas boiler no matter in quality or quantity are growing faster. In addition to the support of national policy, the development of industrial gas boiler also benefited from the convenience of natural gas.
Recently, Tianjin issued a notice to expand the scope of the ban on high-pollution fuel combustion zone, which is based on high-pollution fuel combustion zone ban on the delineation of Tianjin in 2015, to further expand this range, Tianjin has completed the bulk of urban and rural coal clean energy alternative areas have been completed and no did not go to the construction of Wuqing classified as high-pollution fuel combustion zone ban, and to delineate new range of units street town combustion zone ban.
1, the implementation of zoning classification control. Still requires strict control within the range 2015 designated combustion zone ban, prohibited the use of a single steam of less than 35 t / h of coal-fired boiler, steam 35 tons / hr or higher requires a particularly coal-fired boiler for emission limits or ultra-low emission requirements, while a total ban on all kinds of loose coal burning.
2, ban on burning area has expanded. New ban on burning area of 3107.99 square kilometers, Binhai New Area and design Dongli, Xiqing, Jinnan, Beichen, Wuqing, Baodi, Ninghe 9 district and Haihe Education Park. After the adjustment, the city's high-pollution fuel combustion zone ban area of 830.54 square kilometers by 2015 increased to 3938.53 square kilometers, accounting for 33.05 percent of the city's total area.
3, clearly biomass fuel control requirements. According to local emission standards biomass fired boiler air pollutants Tianjin promulgated in 2018, re-notice provisions of the central city, Binhai New Area, the seat of government of other towns and other key areas of government regulations prohibit burning biomass briquettes .
First, in line with environmental standards, higher efficiency due to low gas other fuel gas traveling grate coal fired boiler in vietnam surat ash, sulfur and nitrogen than coal, burning more fully, and thus the amount of dust in the dust rarely, can greatly mitigate environmental pollution, and better meet the environmental requirements of modern production, on the other hand due to better overall environmental performance of a gas boiler, prompting the convection bank erosion bear small, good heat transfer, heat radiation and strong, low exhaust gas temperature, thermal efficiency is significantly improved, better use of effects to enhance the overall durability of the good gas boiler, prompting the two complement each other to produce the effect.
According to this feature, the blower must be segmented to meet the needs of the combustion. Although the current domestic production of traveling grate coal fired boiler in vietnam surats are taken into account this feature, using the sub-air room, and is equipped with a damper. However, according to the survey, many units in the actual operation is not performed in accordance with the combustion characteristics of air volume control, the amount of air required for combustion and an actual amount of supply air does not fit very well, so that incomplete combustion loss increases. Therefore, adjustment the combustion in the boiler, the air amount to be supplied to the combustion timely adjusted according to need, to reduce heat loss and improve the thermal efficiency. 3. The use of secondary air. Strengthening of the combustion secondary air stream is very effective, it has the following effects: (1) strengthening the furnace turbulence and mixing of the gas stream in the furnace oxygen and fuel gas are uniformly mixed, so that the chemical loss of incomplete combustion and furnace excess air coefficient is decreased. (2) the secondary air vortex formed in the furnace flue gas, on the one hand to extend the suspension of fine coal particles travel in the furnace increases the residence time of the suspension of fine particles in the furnace, so that there is sufficient time than combustion, incomplete combustion to reduce heat loss; on the other hand due to the separation effect of the vortex gas flow, the coal particles and ash particles thrown back to the furnace, reducing the amount of fly ash escaping the mechanical incomplete combustion to reduce heat loss. (3) the high temperature secondary air in the furnace flue gas is improved fullness, that eliminates dead reduced stagnation zone and improve the utilization of the furnace heating surface. In addition to the secondary air had a marked effect on energy conservation, but on the smoke and dust is also very effective.