Such as boiler load increased, but also to ensure the boiler load unchanged or decreased in order to prevent pressure shall increase the amount of fuel and air supply, strengthen the burning, causing the furnace exit flue gas temperature of the flue gas volume increases and lower water temperature , temperature increase; If the oil and gas fuel is combusted in the furnace carbon black is not fully formed, into the superheater flue causing secondary combustion, but also greatly increase the superheat temperature. Reducing the temperature of the main reasons: improper adjustment of combustion, low flame center furnace; superheater area is small, or too much leakage at the furnace wall; Save water flow rising or temperature reduction; drum water level or high gas-water separator separating efficiency is lowered, the humidity of the vapor is increased; superheater tube fouling, reduced heat absorption and the like.
You must know the problems of energy consumption boiler (boiler thermal efficiency) 1, because the thermal efficiency of boiler problems of a high exhaust gas temperature. b sootblowers into low. c ash combustible large. d is too large or too small boiler oxygen. e heat loss is large. f large air preheater air leakage rate. g coarse pulverized coal. h steam - water quality is poor. I defective equipment, operating parameters are forced down. 2, measures to solve the problem of a lower exhaust gas temperature. b timely elimination of soot blowers defects and improve the investment rate of soot blowers. c reduce fuel ash, slag combustibles. d control the amount of oxygen in the boiler. e reduce heat loss. f air preheater to reduce air leakage rate. g qualified coal fineness control. h to improve the quality of soft drinks. i According to circumstances, the boiler heating surface adjustment arrangement. J burner when necessary transformation to fit the gaseous fuel.
Gas steam boiler load changes in the water level of air pressure adjustment What happens next: load fluctuation gas steam boiler water level of the air pressure regulating what impact the boiler load refers to the amount of steam is supplied outside?. When the variation amount of steam needed outside world, boiler pressure, temperature, level crossing will move. When the load increases, the pressure drop in the water level is low, the air supply should be increased and the amount of coal. While enhanced combustion, and gradually increase the amount of water to maintain normal air pressure and water level. When reducing the load, the air pressure is high the water level rises, the amount of coal should be reduced and the air volume, reduce combustion, then the appropriate amount of water to reduce or suspend the water supply, the air pressure and water level in the stable nominal range, then press normally combustion and to adjust the amount of water. When reducing the load, the pressure rise when the water level is low, to increase the amount of water should be, until the water level returns to normal, then the need for air pressure changes and the load situation, and to adjust the combustion water.
Recently, Yuhang District, Hangzhou, Zhejiang Province, a printing company 20 steam tons / hour of coal-fired boilers have been stalled, this is the last Yuhang district an industrial coal-fired boilers, which marks the shutting down of Yuhang District of industrial enterprises to bid farewell to coal energy structure of coal turned to natural gas and other clean energy, Yuhang District from entering the industrial coal-free era.
Yuhang District "coal-free zone" construction of road resistance and long. As a major industrial zone, a long time, Yuhang District to focus on coal-fired thermal power plants, coal-fired boilers and other industrial enterprises formed a coal-dominated energy consumption structure. In 2014, the maximum amount of coal Yuhang District reached 783,600 tons. Large coal consumption that emissions of sulfur dioxide, dust and the like remain high for many years.
In order to further deepen the air pollution control, to win the Battle of the blue sky, Yuhang District, from 2017, will gradually tangqi thermoelectric, thermoelectric and sea Chongxian three coal-fired thermoelectric power plant with all closed down, the sea of clean natural gas for thermoelectric realized heat. 3 thermal power plant shut down so that the region's coal consumption, pollutant emissions and other indicators to achieve substantial reductions in road construction of "coal-free zone" has taken a crucial step.
Yuhang bid farewell to coal road this did not stop. While coal-fired thermoelectric accounted for the bulk of coal consumption and pollution emissions, but only out of coal-fired power plant is not enough. 2018, the government decided to promote taking advantage of Yuhang District, the region within the remaining four coal-fired industrial enterprises (Coal Products) pot (kiln) furnace closed down or eliminated or modified.
Yuhang District to increase the proportion of electricity consumption, and actively guide the region's energy unit of coal to electricity, oil to electricity, gas bottle to electricity, the construction of an orderly distribution grid, promoting smart grid construction; continue to improve the level of utilization of natural gas, and urban area in addition to all the town cormorant birds, Baizhang full realization of natural gas supply, a total of 850 kilometers of natural gas pipeline construction and municipal gas transformation 45000; to promote the application of photovoltaic power generation, the region's industrial and commercial enterprises amounted to 173 megawatts of photovoltaic capacity building distributed, clean energy applications has taken shape in Yuhang District.
According to statistics, "Thirteen Five Year Plan" (2016-2020) since the implementation of environmental statistics included in Yuhang district industrial enterprises coal consumption from 588,900 tons in 2016 down to 38,900 tons in 2018, to drop in early 2019 0.
A substantial decline in coal consumption is brought to slash emissions of pollutants and air quality improved significantly. 2018, the main pollutant urban air Linping PM2.5 average concentration of 38 micrograms / cubic meter, decreased 40% in 2015. Region sulfur dioxide emissions of 7,833 tons in 2014 to 2018 had dropped more than 90%; NOx emissions to 8490 tons in 2014 to 2018 had dropped more than 60%.
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