(Iii) use of a waste heat boiler for heat recovery. Using the waste heat boiler using waste heat discharged from the heat of the flue gas in a boiler to heat water or generate steam. Such waste heat boiler is provided thermal oil furnace itself does not change the fuel consumption, the waste heat boiler to produce steam or hot water may be used for the production and the occurrence of heating, thereby indirectly ADSF fuel savings. A waste heat boiler provided the following effects: First, since the heat recovery water, it is easy to improve the thermal efficiency of the furnace. Second, because the number of boiler flue gas can be centralized heat recovery, thereby reducing the cost of construction of the heat recovery unit.
Luoyang, Henan Province issued the "Luoyang coal consumption reductions embodiment (2019-2020 years)", the program proposes: To continue to promote alternative coal consumption reduction, the implementation of industry "electricity instead of coal" project.
2016-2018 years, the city of Luoyang excess capacity, coal-fired boiler demolition, energy saving, clean energy alternative through a series of measures to resolve the power industry, pushing the total coal consumption control achieved some success, but the energy mix partial coal, thermal power installed capacity of migraine and thermal power multi siege pattern has not fundamentally changed, there is still emphasis on the industrial structure, high energy-consuming industries continued to increase the proportion of energy consumption, coal consumption is highly concentrated and other issues. Especially since 2018, comprehensive energy consumption of coke, chemical high energy-consuming industries rise significantly, the whole society electricity demand continues to grow, the amount of coal for power generation system tune up utility power plants rise, not fall, some counties (cities, districts) large-scale industrial coal consumption rise, not fall. Therefore, Luoyang City will continue to work to phase out coal-fired boilers to improve the quality of atmospheric environment.
"Plan" put forward the overall goal of coal governance: By 2020, the city's total coal consumption and strive to 2015, down from about 23% control in less than 20.3 million tons. Among them, the total consumption of non-coal power industry control in less than 9.6 million tons, the total coal consumption in coal-fired units ganged public control in less than 10.7 million tons.
"Plan" requirement, the industry needs all kinds of hot water, steam, hot air in the production process, and gradually promote regenerative and direct thermal electric industrial boiler applications. In the metal processing, casting, ceramics, refractories, glass and other industries to promote electric furnaces, industrial kilns and encourage qualified to carry coal to electricity.
Vigorously promote clean heating pilot city construction, 2019, 2020, respectively, the implementation of urban and rural residents electricity instead of coal, 110,000. 2019, 2020, respectively, to complete the electrical heating 500,000 square meters, 800,000 square meters.
In addition, the "plan" also proposed to accelerate the development of clean energy and new energy, the implementation of comprehensive improvement of coal-fired facilities, the city will no longer approve the domain, and the new 35 tons of steam coal-fired boilers, accelerate the elimination of 35 tons of steam / h and coal-fired boiler.
When the pressure of the combi steam boiler protection small small steam boiler pressure exceeds the rated boiler steam pressure protection, the need for chain protection: is shutdown, the system stops the combustion; fire mouth can also be varied, single-stage or two-stage combustion, You can adjust the amount of oil, so the buck, to ensure the safe operation of the boiler. Fuel (gas) pressure protection and steam boiler water, as the use of multiple protection: the pressure controller typically use two pressure controller, the pressure signal converted to an electrical signal, the electromechanical converter, the function of the high pressure, or low levels of signal The electrical switching loss, external circuits or automatic control chain protection. Common pressure controller and pressure gauge, vapor pressure overpressure alarm can cut off the burner limit is reached; pressure controller adjusts single fire or dual fire burning the actual operating pressure; for large burner, the pressure may be adjusted according to the size of the size of the amount of fuel, and always maintain a stable pressure relief valve operation is the last line of defense to protect the boiler, the boiler pressure exceeds the limit, according to the set pressure relief valve design feature, the exhaust pressure relief, to ensure the normal operation of the boiler. Temperature protection temperature protection is an important procedure in the safe operation of the boiler, is particularly important for the regulation and protection of the boiler temperature steam; at the same time to regulate protective role in over-temperature hot water boilers. Conventional boiler temperature protection means is a bimetallic temperature controller.
For the biomass fuel boiler pressure parts,the water side is mainly electro chemical corrosion,the fire side (or flue gas side) is mainly chemical corrosion.The oxygen corrosion belongs to electrochemical corrosion, it is mainly caused by the dissolved oxygen in water.At room temperature,the dissolved oxygen concentration is about 9.1mg / L,according to the GB1576-2001 “industrial boiler water quality” requirement ,the rated steam pressure should not be more than 1.0MPa,the dissolved oxygen concentration should not be more than 0.1mg / L,otherwise,it is likely to lead to metal corrosion.
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