1、220t / h fuel technical and economic analysis of blast furnace gas boiler Abstract: A large steel company in the energy guzzler, the construction of the 220 t / h burning blast furnace gas boiler project technical and economic analysis for enterprise development, on the basis of energy saving and en
2、vironmental protection to achieve coordination and sustainable development provide the basis for decision-making services. Keywords: burning blast furnace gas boiler； economic analysis； energy saving 0 Overview A large steel company in 2005, energy consumption 544 million tons of coal, the comprehen
3、sive energy consumption of 836 tons of steel.3Kgce, tons of steel comparable energy consumption 796. 3Kgce, high Iron and steel industry in 2005 ton of steel 741Kgce of the overall energy consumption per tone of steel than the energy consumption 715Kgce average level. furnace gas emission losses of
4、the company in 2005 was 10.22%. Blast furnace gas emission loss of 143,000 tons of standard coal. (2) of the enterprise in 2005 tons of steel converter gas recovery ratio of 54 m3 and 95 m3 there is a big gap compared with the domestic advanced level. Ton of steel recycled 90 cubic meters of convert
5、er gas, in 2005 the company loss of converter gas 1.77 Billion cubic meters. Enterprises to improve energy efficiency, energy conservation, and plans to build two sets of 220t / h full-burning blast furnace gas temperature and high pressure boilers, and configure a 15MW high back pressure pre-genera
6、tor set. 1 design 1.1 energy-saving and gas balance calculation Corporate pig iron and coke production in 2005 were 6.53 million tons and 300 tons, that is, the hour is high, coke oven gas remains unchanged. In order to reduce the overall energy consumption of tons of steel, converter steel, iron an
7、d steel ratio decreased from 1.08 in 2005, 1.0, converter steel production was 6.5 million tons. Tons of steel converter gas back Yield of 54 cubic meters in 2005 to 90 cubic meters, the recovery of the amount of 585 million cubic meters, 73,100 cubic meters of hours converter gas recovery, more tha
8、n 41,200 cubic meters in 2005 / multi-recycling 38,100 m3 / h. Transfer is to improve the quality of the sinter and blast furnace air temperature, will be more than recovered Ironmaking and sintering of the furnace gas supply system, the replacement of the original use of blast furnace gas. blast fu
9、rnace gas emission in 2005 loss of 10.22%. Should the construction of this work Agenda item, blast furnace gas is basically to hold loose. through the construction of this project, can reduce the thermal power plant of the existing pulverized coal fired boiler steam production, reduce the blast furn
10、ace gas co-firing amount. And steam for the steam capacity of 1.2 heat load calculation and analysis the current situation of supply and demand of the heat load of the whole plant, the main problems are: enterprise Thermal Power Plant 12 pulverized coal boiler. Of which, there are eight Taichung tem
11、perature and pressure boiler was built in the mid-50s of last century, so far has been running for 50 years, the boiler thermal efficiency and steam production capacity has not meet the need for the whole plant pressure steam of, force produced by high-pressure boiler high-pressure steam desuperheat
12、ing supply after decompression, resulting in high-pressure steam pressure losses and energy Source of waste. To this end, the new 220 t / h high temperature and high pressure boilers burning blast furnace gas, and configure a 15MW high back pressure pre-generator sets, hour production of 440 tons of
13、 high-pressure steam. Among them, 300 tons of pressure / high temperature and high pressure steam through the high back pressure pre-generator sets, the use of high temperature and high pressure steam generating 126 million kwh of standard coal equivalent 50,900 tons to achieve residual pressure rec
14、ycling； 300 tons / pressure exhaust steam for the blast furnace to steam moving blower； In addition, 140 t / h high-temperature high-pressure steam for the high pressure thermal power plant turbine generator with gasoline and can reduce the supply of pulverized coal boiler heat load of 140 t /, the
15、corresponding decrease thermal coal consumption by 17 million tons of standard coal equivalent 12 and 07 million tons of. 1.3 design According to the amount of surplus of the enterprise per hour, nearly 40 million cubic meters of blast furnace gas, there are two sets of available programs, the progr
16、am first, the construction of 220 tons / Blast Furnace Gas Boiler (Including front-end) project, two of the program is to build 300 MW Blast Furnace Gas of CCPP (the gas steam combined cycle power generation) project 2 Technical and Economic Analysis Technical and economic construction content using
17、 the analogy of two programs, economic benefits, the investment comparison analysis. (1) the construction of the content Program: The main works include: construction of two sets of 220t / h high temperature and high pressure burning blast furnace gas boiler 1 15MW high back pressure of the front un
18、it, temperature and pressure reduction devices, heaters, deaerator, gas manifolds, instrument control, electrical, plant, and other auxiliary facilities and so on. Option II: The main projects include: construction of a 300 MW Blast Furnace Gas Gas Turbine, a three-pressure waste heat boiler, a 100M
19、W condensing turbine generator, a gas compressor and an air compressor, a reduction temperature reduction pressure equipment, as well as ancillary equipment. Hours use of blast furnace gas power plant of about 400,000 cubic meters, 20,000 cubic meters of coke oven gas, hours of generating capacity 300,000 Kwh. (2) economic benefits Program: The project is put into production, outsourced power raw coal folding of standard coal can be reduced by about 30 million tons a year, saving the purchase of coal of about 1 500 million yuan (coal equivalent discount of 500 yuan / ton), an
