CN101709918B - Integral cascade recovery system of associated energy sources during iron-making production - Google Patents
Integral cascade recovery system of associated energy sources during iron-making production Download PDFInfo
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- CN101709918B CN101709918B CN2009101550084A CN200910155008A CN101709918B CN 101709918 B CN101709918 B CN 101709918B CN 2009101550084 A CN2009101550084 A CN 2009101550084A CN 200910155008 A CN200910155008 A CN 200910155008A CN 101709918 B CN101709918 B CN 101709918B
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Abstract
The invention discloses an integral cascade recovery system of associated energy sources during iron-making production, which comprises a blast furnace gas combustion engine power generating system, a waste heat recovery power generating system, a sintered gas fume recovery system and a hot waste gas cooling recovery system, wherein the blast furnace gas combustion engine power generating system comprises a combustion gas turbine, and the waste heat recovery power generating system comprises a double pressure waste heat boiler. The sintered gas fume recovery system dedusts sintered gas fume derived from a sintering machine by using a deduster and sends the gas fume to the double pressure waste heat boiler under the suction action of a first induced draft fan; and the hot waste gas cooling recovery system also sends the hot waste gas which is generated from cooling thermal sintered ores by the hot waste gas cooling recovery system to the double pressure waste heat boiler under the suction action of a second induced draft fan. In the invention, sensible heat from a sintering process and associated blast furnace gas with low calorific value generated during iron making are integrally recovered and utilized in a cascading way, and an integrated and stable operating high-efficiency comprehensive utilization system of medium-low temperature waste heat and low calorific value blast furnace gas is formed.
Description
Technical field
The present invention relates generally to metallurgy and energy field, be efficient, the utilization system of associated energy sources in a kind of steel plant ironmaking processes (comprising blast furnace gas, sintering sensible heat, flue gas) specifically, integral body, cascade recovery system and the technology of particularly a kind of multi-source combined cycle associated energy sources in iron-making production.
Background technology
Point out in the 3rd " the waste heat overbottom pressure is utilized engineering " in China's Eleventh Five-Year Plan ten big emphasis energy conservation project implementation guidelines: waste heat overbottom pressure and other complementary energy of industry such as China's iron and steel, coloured, coal, building materials, chemical industry, weaving are not fully used, as the oven gas of iron and steel enterprise, blast furnace gas, converter gas, the coal bed gas in colliery, the flammable manufacture gas such as oven gas of coal chemical enterprise, a large amount of emptying, cause the serious waste of the energy, also polluted environment simultaneously.
Steel and iron industry is the important foundation industry of national economy, is the important symbol of national economy level and overall national strength.The steel and iron industry energy consumption accounts for 11% of China's whole nation total energy consumption, and the share that the iron-making production power consumption in the iron and steel production accounts for the steel and iron industry total energy consumption is up to 69.41%, and wherein the sintering process energy consumption almost accounts for 10% of whole enterprise energy consumption.Current China Ferrous Metallurgy industrial energy consumption mainly produces steel state energy consumption level apparently higher than the world, therefore, reduce the ironmaking energy consumption, has very important effect for improving China's steel and iron industry economic benefit and the market competitiveness, for China's energy-saving and emission-reduction and the strategy of sustainable development, also have very important significance simultaneously.
In recent years, domestic iron and steel enterprises is attached great importance to waste gas, UTILIZATION OF VESIDUAL HEAT IN Study on Technology and the application that produces in the iron and steel technology.Application number is that the Chinese patent application of 03104882.X has been announced " whole blast furnace combined cycle method ", and it is integrated oxygen generation system and association circulating power generation system in system for blast furnace ironmaking.Gas turbine engine systems Driven by Coaxial air compressor is for blast furnace air, system oxygen etc. provides compressed air; The oxygen that oxygen generation system produces is blended in the blast furnace air, makes blast furnace realize oxygen-enriched air blast.Application number is that 200710065858.6 Chinese patent has been announced " steel smelting sintering ring-cooling machine middle and low temperature waste heat power generation system ", it is arranging primary superheater, evaporimeter, one-level economizer, secondary economizer from feeding mouth on the high temperature along red ore deposit throughput direction, middle temperature, the low temperature three place's thermals source above the sintering circular-cooler successively, after primary superheater, be provided with the compensation combustion type two-stage superheater, make full use of the sintering circular-cooler waste gas residual heat.Though above-mentioned two patents relate to the heat recovery of blast furnace gas or sinter fume, all consider from whole angle, how simultaneously blast furnace gas, the sintering waste heat of association in steel plant's ironmaking processes carried out efficiently, fully utilizes.
Summary of the invention
The invention provides a kind of be used for the researching and developing integral body of sintering process middle-low temperature heat and low combustion value furnace gas composition, efficient, reliable multi-source (coal gas, flue gas, sensible heat, steam) association circulating power generation system, really accomplish the recycled in its entirety of the low combustion value furnace gas of sintering process sensible heat and ironmaking processes association, the new technology and the method for cascade utilization, strive forming middle-low temperature heat, low combustion value furnace gas high-efficiency comprehensive utilization system complete, energy stable operation.
For achieving the above object, the technical solution used in the present invention is:
The integral cascade recovery system of associated energy sources during iron-making production, comprise, have the blast furnace gas fuel engine power generation system and the waste heat recovery generating system that has two pressure waste heat boilers of gas turbine, waste heat recovery generating system is connected to sinter fume recovery system and heat of cooling gas recovery system.
Described gas turbine is connected with two pressure waste heat boilers.
Described sinter fume recovery system comprises sintering machine, deduster and first air-introduced machine, after the deduster dedusting, sends into the high pressure heated portion of two pressure waste heat boilers from the sinter fume of sintering machine under the swabbing action of first air-introduced machine.
Described heat of cooling gas recovery system comprises disintegrating machine, air-cooler and second air-introduced machine, heat sinter falls from the afterbody of sintering machine, after crusher in crushing, cool off to cooler, the hot waste gas that the cooling back produces is also sent into the low pressure heated portion of two pressure waste heat boilers under the swabbing action of second air-introduced machine again.
In the described waste heat recovery generating system, two pressure waste heat boilers connect steam turbines, and promote the cogeneration machine by steam turbine, and steam turbine is connected with condenser, and the condensed water of condenser returns pair pressure waste heat boilers after by heater and oxygen-eliminating device.
The recirculated water of described condenser recycles by cooling tower and water circulating pump.
The low pressure heated portion of described pair of pressure waste heat boiler is provided with heat pipe.
Described steam turbine is the tonifying Qi condensing turbine.
The present invention compared with prior art has marked improvement and good effect:
(1) the integral body utilization of associated energy sources during iron-making production.Adopt on the basis of gas-steam combined circulation at existing low combustion value furnace gas, the hot waste gas of the sinter fume of sintering machine generation and cooler generation entered respectively in the combined cycle waste heat boiler high and low pressure heating surface, play following four important function:
I) can alleviate or eliminate because sintering cigarette temperature fluctuation is big, and instability, discontinuous such as sinter fume cutout (sintering process allows) may occur, the impact of Turbo-generator Set;
Ii) original sintering waste heat boiler (no afterburning) only produces saturated vapor usually, make that the initial steam that enters steam turbine is moist steam (water entrained by steam), can bring serious water erosion to several grade blades in steam turbine end, after using present technique, produce superheated steam (initial steam) and saturated vapor (filling), reduce the humidity at several grade blades place, steam turbine end, improve the reliability of steam turbine operation;
Iii) can improve the generating efficiency of sintering sensible heat and cooler hot waste gas;
Iv) promote the evaporation capacity of waste heat boiler and the generated energy of unit.
Above-mentioned 4 economy, security, reliabilities that improve the Turbo-generator Set operation greatly.
(2) cascade utilization of associated energy sources during iron-making production.
I) burning of low-calorie blast furnace gas produces about 1000 ℃ flue gas and does work in gas turbine, its exhaust and sinter fume and cooler hot waste gas enter respectively in two pressure waste heat boilers and produce steam, in filling, condensing turbine, do work then, really accomplish the step of waste gas, waste heat energy, efficient, comprehensive utilization;
Ii) the waste heat boiler low-pressure section adopts the gravity assisted heat pipe heat transfer technology, low temperature, little temperature difference afterheat utilization efficient in helping improving.
Description of drawings
Fig. 1 is the integral cascade recovery system flow chart of associated energy sources during iron-making production of the present invention.
Among the figure, 1 is gas compression pump, and 2 is air compressor, and 3 is gas-turbine combustion chamber, 4 is gas turbine, and 5 is two pressure waste heat boilers, and 6 is sintering machine, and 7 is deduster, 8 is first air-introduced machine, and 9 is disintegrating machine, and 10 is cooler, and 11 is second air-introduced machine, 12 is heat pipe, and 13 is steam turbine, and 14 are the cogeneration machine, and 15 is the blast furnace gas generator, 16 is condenser, and 17 is water circulating pump, and 18 is cooling tower, and 19 is condensate pump, 20 is heater, and 21 is oxygen-eliminating device, and 22 is feed pump.
The specific embodiment
The integral cascade recovery system of associated energy sources during iron-making production as shown in Figure 1 comprises blast furnace gas fuel engine power generation system, waste heat recovery generating system, sinter fume recovery system and heat of cooling gas recovery system,
Blast furnace gas fuel engine power generation system is made up of gas compression pump 1, air compressor 2, gas-turbine combustion chamber 3, gas turbine 4 and blast furnace gas generator 15.
Waste heat recovery generating system comprises two pressure waste heat boilers 5, and the low pressure heated portion of two pressure waste heat boilers 5 is provided with heat pipe 12; Two pressure waste heat boilers 5 connect steam turbine 13, and promote cogeneration machine 14 by steam turbine 13; Steam turbine 13 is connected with condenser 16, and the condensed water of condenser 16 returns two pressure waste heat boilers 5 after by condensate pump 19, heater 20, oxygen-eliminating device 21, feed pump 22; The recirculated water of condenser 16 returns condenser 16 by cooling tower 18 and water circulating pump 17 and recycles.
The sinter fume recovery system comprises sintering machine 6, deduster 7 and first air-introduced machine 8, after deduster 7 dedustings, sends into the high pressure heated portion and the low pressure heated portion of two pressure waste heat boilers 5 from the sinter fume of sintering machine under the swabbing action of first air-introduced machine 8,
Heat of cooling gas recovery system comprises disintegrating machine 9, air-cooler 10 and second air-introduced machine 11, heat sinter falls from the afterbody of sintering machine 6, after disintegrating machine 9 fragmentations, cool off to cooler 10, the hot waste gas that the cooling back produces is also sent into the high pressure heated portion and the low pressure heated portion of two pressure waste heat boilers 5 under the swabbing action of second air-introduced machine 11 again.
Steam turbine 13 adopts the tonifying Qi condensing turbine, and heater 20 adopts gland heater.
Its concrete technological process is as follows:
Blast furnace gas is managed introducing from mother, through cooling (in order to improve coal gas density, heat is reclaimed by condensate water), dedusting, after gas compression pump 1 supercharging, enters gas-turbine combustion chamber 3; Air enters air compressor 2 after filtering; Air after boosting and the mixed combustion in gas-turbine combustion chamber 3 of high pressure blast furnace gas.At the burning initial stage, coke-stove gas is blended in the blast furnace gas to improve calorific value, be easy to burning.The flue gas of HTHP is the adiabatic expansion acting in gas turbine 4, and its energy is converted into mechanical energy, drives air compressor 2 and gas compression pump 1 work and promotes 15 generatings of blast furnace gas generator.Reduce to about 500 ℃ through the flue-gas temperature after gas turbine 4 actings, enter two pressure waste heat boilers 5 and reclaim heat energy.Meanwhile, after deduster 7 dedustings, under the swabbing action of first air-introduced machine 8, send into two pressure waste heat boilers 5 from the sinter fume of sintering machine 6; Heat sinter falls from the afterbody of sintering machine 6, after disintegrating machine 9 fragmentations, cools off to cooler 10 again, and the hot waste gas that the cooling back produces is also sent into two pressure waste heat boilers 5 under the swabbing action of second air-introduced machine 11.Sinter fume and hot waste gas are sent into the different heating surfaces (the high pressure heating surface of high pressure heated portion and the low pressure heating surface of low pressure heated portion) of two pressure waste heat boilers 5 respectively according to its temperature grade.High-pressure section adopts the Natural Circulation technology, and low-temp low-pressure partly adopts the gravity assisted heat pipe heat transfer technology, produces high and low pressure steam respectively, enters filling condensing turbine 13 acting of expanding, and the energy of steam is converted into mechanical energy and promotes 14 generatings of cogeneration machine.Steam in steam turbine 13 after the acting is called exhaust steam, enters in the condenser 16 and is condensed into water.The recirculated water that is used for cooler condenser 16 by cooling tower 18 coolings after, again through water circulating pump 17 pressurizations, get back to condenser 16 and continue the cooling exhaust steam.Pressurize by condensate pump 19 through condenser 16 cooled condensate water, and be heated to uniform temperature, get back to oxygen-eliminating device 21 then and carry out deoxygenation through gland heater 20.Water after the deoxygenation is again through getting back to two pressure waste heat boilers 5 after feed pump 22 pressurizations.
Claims (5)
1. the integral cascade recovery system of associated energy sources during iron-making production, comprise: have the blast furnace gas fuel engine power generation system and the waste heat recovery generating system that has two pressure waste heat boilers (5) of gas turbine (4), it is characterized in that: waste heat recovery generating system is connected to sinter fume recovery system and heat of cooling gas recovery system;
Described gas turbine (4) is connected with two pressure waste heat boilers (5);
Described sinter fume recovery system comprises sintering machine (6), deduster (7) and first air-introduced machine (8), after deduster (7) dedusting, under the swabbing action of first air-introduced machine (8), send into the high pressure heated portion and the low pressure heated portion of two pressure waste heat boilers (5) from the sinter fume of sintering machine (6);
Described heat of cooling gas recovery system comprises disintegrating machine (9), air-cooler (10) and second air-introduced machine (11), heat sinter falls from the afterbody of sintering machine (6), after disintegrating machine (9) fragmentation, cool off to cooler (10), the hot waste gas that the cooling back produces is also sent into the high pressure heated portion and the low pressure heated portion of two pressure waste heat boilers (5) under the swabbing action of second air-introduced machine (11) again.
2. integral cascade recovery system as claimed in claim 1, it is characterized in that: in the described waste heat recovery generating system, two pressure waste heat boilers (5) connect steam turbine (13), steam turbine (13) promotes cogeneration machine (14), steam turbine (13) is connected with condenser (16), and the condensed water of condenser (16) returns two pressure waste heat boilers (5) after by heater (20) and oxygen-eliminating device (21).
3. integral cascade recovery system as claimed in claim 2 is characterized in that: the recirculated water of described condenser (16) recycles by cooling tower (18) and water circulating pump (17).
4. integral cascade recovery system as claimed in claim 1 is characterized in that: the low pressure heated portion of described pair of pressure waste heat boiler (5) is provided with heat pipe (12).
5. integral cascade recovery system as claimed in claim 1 is characterized in that: described steam turbine (13) is the tonifying Qi condensing turbine.
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| CN2009101550084A CN101709918B (en) | 2009-12-10 | 2009-12-10 | Integral cascade recovery system of associated energy sources during iron-making production |
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| CN102183152B (en) * | 2011-01-12 | 2012-12-05 | 浙江大学 | Steel enterprise associated energy combined cycle power generation system and method |
| CN103540761B (en) * | 2013-10-22 | 2015-12-02 | 株洲鼎端装备股份有限公司 | High temperature continuous smelting platform furnace |
| CN104153832B (en) * | 2014-08-13 | 2016-06-01 | 昆明钢铁集团有限责任公司 | A kind of iron and steel enterprise's complementary energy synthesis efficient electric power generation method and power generation system thereof |
| CN105443244A (en) * | 2015-11-13 | 2016-03-30 | 武汉钢铁(集团)公司 | Fuel gas-steam combined cycle power generator set two-stage coal gas pressurization system |
| CN105695649B (en) * | 2016-04-15 | 2017-06-30 | 中冶华天工程技术有限公司 | Distributed energy resource system based on blast furnace ironmaking |
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| CN1434132A (en) * | 2003-02-21 | 2003-08-06 | 钢铁研究总院 | Integral blast furnace combined circulation method |
| CN1959084A (en) * | 2006-04-13 | 2007-05-09 | 中国科学院工程热物理研究所 | Combined cycle method and installation of combustion turbine of burning blast furnace gas |
| CN101071043A (en) * | 2007-05-09 | 2007-11-14 | 昆明阳光数字技术股份有限公司 | Low-temperature residual heat power generating system for steel smelting sintering ring-cooling machine |
| CN101509729A (en) * | 2009-01-15 | 2009-08-19 | 江苏东能环保能源科技有限公司 | Sintered power generation by waste heat system with by-product gas afterburning |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1434132A (en) * | 2003-02-21 | 2003-08-06 | 钢铁研究总院 | Integral blast furnace combined circulation method |
| CN1959084A (en) * | 2006-04-13 | 2007-05-09 | 中国科学院工程热物理研究所 | Combined cycle method and installation of combustion turbine of burning blast furnace gas |
| CN101071043A (en) * | 2007-05-09 | 2007-11-14 | 昆明阳光数字技术股份有限公司 | Low-temperature residual heat power generating system for steel smelting sintering ring-cooling machine |
| CN101509729A (en) * | 2009-01-15 | 2009-08-19 | 江苏东能环保能源科技有限公司 | Sintered power generation by waste heat system with by-product gas afterburning |
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| JP昭56-2427A 1981.01.12 |
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