CN103133067A - Steel-mill residual blast-furnace gas and residual saturated steam comprehensive utilization power generation system - Google Patents
Steel-mill residual blast-furnace gas and residual saturated steam comprehensive utilization power generation system Download PDFInfo
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- CN103133067A CN103133067A CN2013100830915A CN201310083091A CN103133067A CN 103133067 A CN103133067 A CN 103133067A CN 2013100830915 A CN2013100830915 A CN 2013100830915A CN 201310083091 A CN201310083091 A CN 201310083091A CN 103133067 A CN103133067 A CN 103133067A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a steel-mill residual blast-furnace gas and residual saturated steam comprehensive utilization power generation system which comprises a gas boiler combustion utilization system, a saturated steam surplus heat utilization system, a steam turbine power generation system and an auxiliary system. An air pre-heater heats normal-temperature air through exhaust gas surplus heat of hearth combustion in a heat exchange mode, the air and gas are mixed at a nozzle position through a hot air pipeline to enter a hearth together to be combusted, high temperature flue gas after combustion successively passes through a high-low temperature overheater, a high-low temperature economizer and the air pre-heater and then is conveyed into a chimney through an induced draft fan, and a gas-fired boiler utilizes a single-pressure thermal system. Overheated steam (self-producing and outside supplying) passing through the gas-fired boiler is conveyed to a main throttle valve of a steam turbine from a main steam pipeline, and after the steam pushes the steam turbine to act and drive a generator to generate power, dead steam is condensed into water through a condenser. The steel-mill residual blast-furnace gas and residual saturated steam comprehensive utilization power generation system comprehensively utilizes secondary energy, improves boiler performance, and increases the output of boiler steam quantity.
Description
Technical field
The invention belongs to the technical field that energy recovery is utilized, be specifically related to a kind of steel mill blast furnace gas more than needed and saturated vapour comprehensive utilization power generation system more than needed and method thereof.
Background technique
China's steel industry is through development for many years, technically obtained the progress that attracts people's attention, but compare advanced international standard, China's ton steel comprehensive energy consumption average specific international most advanced level exceeds 10-15%, cause that the steel industry energy consumption is large, seriously polluted, the industrial resources utilization ratio is low, and the situation that progressively deepened by the restriction of resource, environment and the energy.With progressive, country progressively improves the requirement of the aspects such as comprehensive utilization of resources conservation, environmental protection, the energy along with the growing of society.Social in order to build the energy-saving low-carbon type, country's a series of laws and regulations of appearance its objective is and promote high energy-consuming enterprises to reduce energy consumption, low-carbon environment-friendly ground production.Add country " 12 " in the works to the emphasizing of energy-saving and emission-reduction, must carry out development of latent energy-saving potential to greatest extent, improve energy-saving horizontal to satisfy " 12 " in the works to the energy-saving index of steel industry as the steel industry of highly energy-consuming.
As everyone knows, the rich a large amount of secondary energy (by-product: saturated vapour and coal gas) that produce, use these by-products scientifically and rationally in the refining process of iron and steel, can reduce entreprise cost, improve the comprehensive benefit of enterprise.At present, because this part energy collection utilization is more difficult, be all directly to be discharged in atmosphere usually, cause a large amount of wastes of the energy and the pollution of environment.
except traditional direct discharge method, also have two kinds of technology in prior art: the one, steel mill's afterheat steam is heating technology (number of patent application: CN201220242978.5) again, this technology is that design one cover gas fired boiler is passed into the saturated vapour that produces in the iron and steel refining process and carries out in gas fired boiler being used after overheated, be characterized in that boiler is down " U " font, one end sealing of furnace chamber consists of insulated combustion chamber, the other end opening also is connected with air preheater, there is smoke outlet the air preheater below, on the sidewall of insulated combustion chamber, blast furnace gas burner is arranged, in furnace chamber above air preheater, superheater is set.This technology is that saturated vapour in the iron and steel refining process is as Raw material processing, so high to the degree of dependence of steel mill due to what utilize.the 2nd, coal gas of converter and afterheat steam comprehensive utilization electricity generating device (number of patent application: CN200410058542.0), this technology is to enter the generating of turbine generator group after the coal gas in the iron and steel refining process is passed into the self-produced superheated vapor of gas fired boiler, be characterized in the fuel chambers take coal gas of converter as fuel, steam generator, drum, on the basis of superheater and Converter Residual Heat Boiler, newly-increased thermal accumulator and gas-distributing cylinder, thermal accumulator is connected with gas-distributing cylinder with drum respectively, gas-distributing cylinder is connected with Converter Residual Heat Boiler steam and other fluctuation or non-fluctuation afterheat steam summary device again, gas-distributing cylinder is connected with steam turbine generator by superheater, form complete closed-circuit power generation system.This technological synthesis utilizes coal gas of converter and afterheat steam, wasted original saturated vapour, not only reduce the Boiler Steam quality and also reduced boiler safety, and owing to being that self-produced steam carries out heat exchange, if the boiler unstable state is easy to cause the dry combustion method of boiler superheater, cause the booster phenomenon to occur.
Summary of the invention
The art of this patent is intended to the secondary energy in comprehensive full use steel manufacture process: coal gas and saturated vapour are scientificlly and effectively utilized.Utilize coal gas to burn to produce superheated vapor and utilize its waste heat to remove saturated vapour in overheated steelmaking process; this technological scheme had both reduced the dependence of boiler to steel mill; can make again the stable output in large quantities of boiler; improved steam quality; be conducive to the operation of steam turbine power generation group and reduced the discharging of pollutant, be conducive to environmental protection.
For achieving the above object, the present invention is by the following technical solutions:
Steel mill's blast furnace gas more than needed and saturated vapour comprehensive utilization power generation system more than needed, comprise that the gas boiler burning utilizes system, useless saturated vapour bootstrap system, turbine generating system and auxiliary system, described gas boiler burning utilizes system to comprise: gas fired boiler, drum, steam generator water cooled furnace wall, high temperature superheater, low temperature superheater, high-temperature economizer, low-level (stack-gas) economizer, air preheater, blower, cold-air duct, hot-air duct and valve; Wherein said steam generator water cooled furnace wall is layed in the inwall of gas fired boiler burner hearth, and is connected with drum with falling tube by asending pipe; Described high temperature superheater and low temperature superheater be positioned at burner hearth above, high temperature superheater is connected with steam turbine with main steam line; Described high-temperature economizer, low-level (stack-gas) economizer and air preheater are arranged in the flue of fire box, and arrange from top to bottom successively; Described hot-air duct is connected with gas pipeline, and described cold-air duct is connected with air preheater by blower; The smoke outlet pipeline connects fire box, and is connected with chimney by induced draught fan;
Described useless saturated vapour bootstrap system comprises saturated vapour conveyance conduit, high temperature superheater, low temperature superheater and main steam line, and wherein the saturated vapour conveyance conduit is connected with described steam turbine with main steam line by described low temperature superheater, described high temperature superheater successively;
Described turbine generating system comprises described steam turbine, generator, vapour condenser, condensate pump and corresponding pipeline, and wherein said steam turbine is connected with generator, and described steam turbine, vapour condenser are connected successively with condensate pump.
Utilize the method for above-mentioned power generation system specific as follows:
described gas boiler burning utilizes system, at first modulating valve and air-regulating valve turn on the gas-fire, air preheater utilizes the fume afterheat of hearth combustion that normal temperature air is heated in the mode of heat exchange, then be mixed into hearth combustion at the nozzle place by hot-air duct and coal gas, utilize the water cooled furnace wall of arranging in burner hearth can also play a protective role to inboard wall of burner hearth simultaneously as steam generator, after burning, high-temperature flue gas passes through high temperature superheater successively, low temperature superheater, high-temperature economizer, low-level (stack-gas) economizer, be transported in chimney by induced draught fan after air preheater, wherein gas fired boiler adopts single thermodynamic system of pressing, described steamer power generation system is delivered to the main inlet throttle-stop valve of steam turbine by main steam line through the overheated steam of gas fired boiler (self-produced+outer for), after the Steam Actuation steam turbine do work and drives generator and generate electricity, exhaust steam process vapour condenser was condensed into water.wherein boiler circuit is by condensate pump, the water of condensation in condenser hotwell to be delivered to oxygen-eliminating device, delivered in the high low-level (stack-gas) economizer of gas boiler by feed water pump after deoxygenation and heat, feedwater after heating is delivered in the gas boiler drum, then heat exchange forms saturated vapour in the steam generator water cooled furnace wall, the hot gas of crossing that finally meets process design parameter by the overheated one-tenth of high low temperature superheater is transported in steam turbine and does work, so form a complete steam/water circulating loop, and external saturated vapour is to be introduced in the low temperature superheater header, then carrying out the self-produced hot gas of crossing of gas that overheated one-tenth meets process design parameter and boiler by high low temperature superheater mixes to send in steam turbine in the lump and does work.
The present invention takes full advantage of the saturated vapour of by-product in the coal gas of by-product in the blast furnace refining process and steelmaking process, be that single utilization coal gas is compared with useless saturated vapour with present conventional art, this technology comparison Comprehensive has utilized secondary energy and has improved boiler performance, increased the output of Boiler Steam amount, had the following advantages:
1, fully utilized the secondary energy in the steelmaking process, reduced the discharging of pollutant: blast furnace gas is burnt to be produced superheated vapor and useless saturated vapour is carried out overheated recycling;
2, stability and the Security of boiler have been strengthened: because the boiler self-produced steam has reduced dependency to process for making, introduce again the dry combustion method phenomenon that the saturated vapour in steelmaking process avoided boiler superheater to occur simultaneously and occur, extended boiler working life;
So 3, owing to introducing the overheated generated energy that increases turbine generator of saturated vapour, reduced cost of production.
Description of drawings
Fig. 1 is the installation drawing of power generation system of the present invention.in figure except the word of having indicated, the 1-gas pipeline, the 2-hot-air duct, 3-steam generator water cooled furnace wall, the 4-high temperature superheater, the 5-low temperature superheater, the 6-high-temperature economizer, the 7-low-level (stack-gas) economizer, the 8-air preheater, the 9-cold-air duct, the 10-blower, the 11-drum, 12-saturated vapour conveyance conduit, the 13-main steam line, the 14-steam turbine, the 15-generator, the 16-vapour condenser, 17-exhaust steam pipeline, the 18-condensing water conduit, the 19-vacuum dust cather, 20-cool cycles waterpipe, the 21-cooling tower, the 22-feedwater piping, 23-smoke outlet pipeline, the 24-induced draught fan, the 25-chimney, the 26-gas fired boiler, the 27-falling tube, the 28-asending pipe, the 29-condensate pump, the 30-feed water pump.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, the rich blast furnace gas of steel mill of the present invention and rich saturated vapour utilize power generation system, utilize the gas boiler combustion system to comprise: gas fired boiler 26, drum 11, steam generator water cooled furnace wall 3, high temperature superheater 4, low temperature superheater 5, high-temperature economizer 6, low-level (stack-gas) economizer 7, air preheater 8, blower 10, cold-air duct 9, hot-air duct 2 and valve; Wherein steam generator water cooled furnace wall 3 is layed in the inwall of gas fired boiler 26 burner hearths, and is connected with drum 11 with falling tube 27 by asending pipe 28; Described high temperature superheater 4 and low temperature superheater 5 be positioned at burner hearth above, high temperature superheater 4 is connected with steam turbine 14 with main steam line 13; High-temperature economizer 6, low-level (stack-gas) economizer 7 and air preheater 8 are arranged in the flue of fire box, and arrange from top to bottom successively; Described hot-air duct 2 is connected with gas pipeline 1, and cold-air duct 9 is connected with air preheater 8 by blower 10; Smoke outlet pipeline 23 connects fire box, and is connected with chimney 25 by induced draught fan 24.
Useless saturated vapour bootstrap system, comprise saturated vapour conveyance conduit 12, high temperature superheater 4, low temperature superheater 5 and main steam line 13, wherein saturated vapour conveyance conduit 12 is connected with steam turbine 14 with main steam line 13 by low temperature superheater 4, high temperature superheater 5 successively.
Turbine generating system comprises steam turbine 14, generator 15, vapour condenser 16, condensate pump 29 and corresponding pipeline, and wherein steam turbine 14 is connected with generator 15, and steam turbine 14, vapour condenser 16 are connected successively with condensate pump 29.
the concrete technology flow process: the boiler burning that turns on the gas-fire utilizes gas regulator and the air-regulating valve of system, air preheater 8 utilizes the fume afterheat of hearth combustion that normal temperature air is heated in the mode of heat exchange, then be mixed into hearth combustion at the nozzle place by hot-air duct 2 and coal gas, utilize the water cooled furnace wall 3 of arranging in burner hearth can also play a protective role to inboard wall of burner hearth simultaneously as steam generator, after burning, high-temperature flue gas is successively by high temperature superheater 4, low temperature superheater 5, high-temperature economizer 6, low-level (stack-gas) economizer 7, be transported in chimney 25 by induced draught fan 24 after air preheater 8, wherein gas fired boiler adopts single thermodynamic system of pressing, delivered to the main inlet throttle-stop valve of steam turbine 14 by main steam line 13 through gas fired boiler overheated steam, after the Steam Actuation steam turbine do work and drives generator 15 and generate electricity, exhaust steam was passed through vapour condenser 16 and is condensed into water, wherein condensate pump 18 is delivered to oxygen-eliminating device 19 to the water of condensation in condenser hotwell, pass through successively low-level (stack-gas) economizer 7 by feed water pump 30 after deoxygenation, high-temperature economizer 6 heating, feedwater after heating is delivered in gas boiler drum 11, then heat exchange forms saturated vapour in steam generator water cooled furnace wall 3, the hot gas of crossing that finally meets process design parameter by the overheated one-tenth of high low temperature superheater is transported in steam turbine and does work, so form a complete steam/water circulating loop, and external saturated vapour is to be introduced in the low temperature superheater header, then carrying out successively the self-produced hot gas of crossing of the overheated gas that becomes to meet process design parameter and boiler by low temperature superheater 5 and high temperature superheater 4 mixes to send in steam turbine in the lump and does work.
The present invention utilizes discarded coal gas to be resource, build gas fired boiler and produce steam, introduce simultaneously the saturated vapour that produces in steel-making, ironmaking processes and enter boiler, make system can guarantee that boiler self-produced steam parameter reaches designing requirement and guarantees that simultaneously external steam quality is improved by the reasonable Arrangement to boiler heating surface.The steam that after mixing, quality is improved is transported to Turbo-generator Set and generates electricity.So not only rationally utilize secondary energy to create the discharge amount that new value has also reduced atmospheric pollutant, belonged to environmental protection and economy type technology.
Claims (2)
1. steel mill's blast furnace gas more than needed and saturated vapour more than needed fully utilize power generation system, comprise that the gas boiler burning utilizes system, useless saturated vapour bootstrap system, turbine generating system and auxiliary system, is characterized in that:
Described gas boiler burning utilizes system to comprise: gas fired boiler (26), drum (11), steam generator water cooled furnace wall (3), high temperature superheater (4), low temperature superheater (5), high-temperature economizer (6), low-level (stack-gas) economizer (7), air preheater (8), blower (10), cold-air duct (9), hot-air duct (2) and valve; Wherein said steam generator water cooled furnace wall (3) is layed in the inwall of gas fired boiler (26) burner hearth, and is connected with drum (11) with falling tube (27) by asending pipe (28); Described high temperature superheater (4) and low temperature superheater (5) be positioned at burner hearth above, high temperature superheater (4) is connected with steam turbine (14) with main steam line (13); Described high-temperature economizer (6), low-level (stack-gas) economizer (7) and air preheater (8) are arranged in the flue of fire box, and arrange from top to bottom successively; Described hot-air duct (2) is connected with gas pipeline (1), and described cold-air duct (9) is connected with air preheater (8) by blower (10); Smoke outlet pipeline (23) connects fire box, and is connected with chimney (25) by induced draught fan (24);
Described useless saturated vapour bootstrap system comprises saturated vapour conveyance conduit (12), high temperature superheater (4), low temperature superheater (5) and main steam line (13), and wherein saturated vapour conveyance conduit (12) is connected with described steam turbine (14) with main steam line (13) by described low temperature superheater (4), described high temperature superheater (5) successively;
Described turbine generating system, comprise described steam turbine (14), generator (15), vapour condenser (16), condensate pump (29) and corresponding pipeline, wherein said steam turbine (14) is connected with generator (15), and described steam turbine (14), vapour condenser (16) are connected successively with condensate pump (29).
2. utilize the electricity-generating method of steel mill as claimed in claim 1 blast furnace gas more than needed and saturated vapour comprehensive utilization power generation system more than needed, comprise the steps: at first to open gas regulator and the air-regulating valve that described gas boiler burning utilizes system, air preheater utilizes the fume afterheat of hearth combustion that normal temperature air is heated in the mode of heat exchange, then be mixed into hearth combustion at the nozzle place by hot-air duct and coal gas, utilize the water cooled furnace wall of arranging in burner hearth can also play a protective role to inboard wall of burner hearth simultaneously as steam generator, after burning, high-temperature flue gas passes through high temperature superheater successively, low temperature superheater, high-temperature economizer, low-level (stack-gas) economizer, be transported in chimney by induced draught fan after air preheater, wherein gas fired boiler adopts single thermodynamic system of pressing, delivered to the main inlet throttle-stop valve of steam turbine by main steam line through gas fired boiler overheated steam, after the Steam Actuation steam turbine do work and drives generator and generate electricity, exhaust steam was passed through vapour condenser and is condensed into water, wherein condensate pump is delivered to oxygen-eliminating device to the water of condensation in condenser hotwell, delivered in the high low-level (stack-gas) economizer of gas boiler by feed water pump after deoxygenation and heat, feedwater after heating is delivered in the gas boiler drum, then heat exchange forms saturated vapour in the steam generator water cooled furnace wall, the hot gas of crossing that finally meets process design parameter by the overheated one-tenth of high low temperature superheater is transported in steam turbine and does work, so form a complete steam/water circulating loop, and external saturated vapour is to be introduced in the low temperature superheater header, then carrying out successively the self-produced hot gas of crossing of the overheated gas that becomes to meet process design parameter and boiler by low temperature superheater and high temperature superheater mixes to send in steam turbine in the lump and does work.
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| CN103344124A (en) * | 2013-07-17 | 2013-10-09 | 广州智光节能有限公司 | Lime kiln waste gas waste heat electricity generating system with by-product coal gas afterburning function |
| CN103343955A (en) * | 2013-07-25 | 2013-10-09 | 南京凯盛开能环保能源有限公司 | Comprehensive recycling boiler device of extra coal gas and saturated steam of steel plant |
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| CN103343955A (en) * | 2013-07-25 | 2013-10-09 | 南京凯盛开能环保能源有限公司 | Comprehensive recycling boiler device of extra coal gas and saturated steam of steel plant |
| CN103673650A (en) * | 2013-12-13 | 2014-03-26 | 南京凯盛开能环保能源有限公司 | Steel mill surplus gas and sanitary steam comprehensive utilization system and method |
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Application publication date: 20130605 |