CN103899365A - Power generation device and method using medium-temperature and medium-pressure steam and low-pressure saturated steam in metallurgical industry - Google Patents
Power generation device and method using medium-temperature and medium-pressure steam and low-pressure saturated steam in metallurgical industry Download PDFInfo
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Abstract
The invention relates to a power generation device and method using medium-temperature and medium-pressure steam and low-pressure saturated steam in the metallurgical industry. The power generation device structurally comprises a steam turbine, an electric generator, a low-pressure saturated steam inlet device, a dead steam condensing device, a deaerator and a combustion boiler, wherein the electric generator is connected with an output part of the steam turbine, the low-pressure saturated steam inlet device is connected with an auxiliary steam connector of the steam turbine, a condensed water inlet of the deaerator is connected with the condensing device, a heating steam connector is connected with the low-pressure saturated steam inlet device, the heating steam connector of the deaerator is also connected with external steam, and a steam outlet of the combustion boiler is connected with a main steam connector of the steam turbine. The power generation method comprises the steps that gas is collected to heat the combustion boiler, the medium-temperature and medium-pressure steam is generated, and then the steam turbine is pushed to rotate to drive the electric generator to generate electricity. According to the power generation device and method using the medium-temperature and medium-pressure steam and the low-pressure saturated steam in the metallurgical industry, the combustion boiler is used for recovering redundant gas in the metallurgical industry, and air pollution caused by diffusion of the gas is avoided; redundant low-pressure saturated steam can be recovered, and waste of energy is avoided; cyclic and economical utilization is achieved.
Description
Technical field
The present invention relates to a kind of medium temperature and medium pressure steam of a small amount of coal gas generation in metallurgy industry and device and method that low-pressure saturated steam generates electricity of being used in.
Background technique
Metallurgy industry is high energy consumption, high pollutive industries, and energy-saving and emission-reduction situation is very severe.In recent years, some enterprise was by taking multiple technologies measure, as built CCPP, private station etc.A large amount of coal gas (as blast furnace, converter and coke-stove gas), utilize boiler burning, produce steam for generating, and the saturated vapour of the large low pressure of a tittle is also utilized (as converter and oven saturated vapour etc.), but the coal gas that a tittle is few and low-pressure saturated steam are still diffused, that abandons ignores, and has caused the heavy losses of the energy.
Current metallurgy industry is mainly to adopt the large coal gas of independent burning boiler burning amount, and the steam of generation is mainly used in generating; Adopt independently Turbo-generator Set to reclaim low-pressure saturated steam for generating.The defect of its technology is: what the coal gas that a tittle is little and saturated vapour were abandoned ignores, and causes energy loss.
Summary of the invention
For the waste of minimizing data, make good use of more completely the inflammable gas of metallurgy industry discharge and the steam that contains energy, and reduce the harm of discharge to environment, the invention provides a kind of metallurgy industry medium temperature and medium pressure steam and low-pressure saturated steam electricity generating device and method.
Electricity generating device provided by the invention is as follows:
It comprises steam turbine, and for steam-energy being converted to mechanical rotation function, steam turbine arranges end and is provided with main steam interface, and middle part is provided with auxiliary steam interface, and afterbody is provided with exhaust steam exhaust port.
Comprise generator, for the power of steam turbine output is generated electricity; Generator is connected with the output of steam turbine.
Comprise low-pressure saturated steam access device, be connected with steam turbine auxiliary steam interface, for steam turbine provides auxiliary steam.
Comprise exhaust steam condensation device, for by acting after exhaust steam be converted into water of condensation, exhaust steam condensation device be connected to steam turbine afterbody exhaust steam exhaust port.
Comprise oxygen-eliminating device, for by water of condensation deoxygenation; Oxygen-eliminating device water of condensation water intake is connected with condensation device, and water outlet is connected with boiler water-feeding device; Heating steam interface is connected with low-pressure saturated steam access device; Oxygen-eliminating device heating steam interface is connected with steam-out (SO) simultaneously.
Comprise burning boiler, burn for gathering unnecessary coal gas, and produce medium temperature and medium pressure steam; Burning boiler steam (vapor) outlet is connected with steam turbine main steam interface.
A kind of metallurgy industry medium temperature and medium pressure steam as above and low-pressure saturated steam electricity generating device, illustrate further for, described low-pressure saturated steam access device comprises steam-water separator and mortor operated valve, on steam-water separator, be provided with low-pressure saturated steam import, be used for inputting low-pressure saturated steam, on steam-water separator, be also provided with low-pressure saturated steam outlet, be connected with mortor operated valve, mortor operated valve is connected with steam turbine auxiliary steam interface and oxygen-eliminating device heating steam interface respectively.
The electricity-generating method step of metallurgy industry medium temperature and medium pressure steam and low-pressure saturated steam of utilizing provided by the invention is as follows:
1, a small amount of coal gas producing is collected, and by the heated by gas burning boiler of collecting.
2, burning boiler produces medium temperature and medium pressure steam, is input to steam turbine main steam interface, pushing turbine rotation, and steam turbine drives generator to generate electricity.
3, low-pressure saturated steam is input to steam-water separator, be dried by steam-water separator, dried low-pressure saturated steam is assigned to steam turbine auxiliary steam interface and oxygen-eliminating device by mortor operated valve, is used to steam turbine to add auxiliary force and moves, simultaneously for condensed water deoxygenation is carried out in oxygen-eliminating device heating.
4, the exhaust steam after acting enters into exhaust steam condensation device, becomes water of condensation after condensation, and water of condensation, by after oxygen-eliminating device deoxygenation, is added in boiler feed water again.
5, in the time inputting without low-pressure saturated steam, close mortor operated valve, cut off steam turbine auxiliary steam interface channel, oxygen-eliminating device heating steam interface and steam-out (SO) are connected, and utilize steam-out (SO) to heat deoxygenation.
the present invention has following beneficial effect:
Adopt burning boiler to reclaim unnecessary coal gas in metallurgy industry, avoid coal gas diffusion to pollute atmosphere; Can reclaim low-pressure saturated steam more than needed, avoid the waste of the energy.Have the advantages that recycling economy is utilized.
Adopt steam-water separator to improve the mass dryness fraction of saturated vapour, effectively avoided the water erosion of steam turbine.
In this technological process, only need medium temperature and medium pressure steam can be with 30% load, low-pressure saturated steam just can be used as filling and is used for generating electricity.
Low-pressure saturated steam in the present invention both can be used for deoxygenation, also can be used for generating.
In this technological process, in the time there is no low-pressure saturated steam, medium temperature and medium pressure steam also can be used for generating electricity.
Exhaust steam after work done, after circulating cooling water cooling, becomes water of condensation, then after oxygen-eliminating device deoxygenation, gives burning boiler use, has saved water.
Suitable filling mouth is set in steam turbine, in the time having saturated vapour, utilizes saturated vapour to carry out deoxygenation, while thering is no saturated vapour, the electric valve after steam-water separator is closed, and utilizes the filling mouth arranging to extract a part of steam deoxygenation out.
Its economic benefit calculation of the present invention:
For environmental protection:
One playscript with stage directions equipment can be avoided the discharge of metallurgy industry converter 0.9 ten thousand Nm3/h coal gas amounts, the discharge of blast furnace 1.2 ten thousand Nm3/h coal gas amounts.Can avoid 12.5t/h Converter Steam, 1.8～3t/h rolling line steam directly to discharge.
For economic benefit: completely by the metallurgy industry converter that can only discharge in the past 0.9 ten thousand Nm3/h coal gas amounts, blast furnace 1.2 ten thousand Nm3/h coal gas amounts, 12.5t/h Converter Steam, 1.8～3t/h rolling line steam for generating, its power benefit is according to generator power 6000kW, voltage rating 10500V meter
With operation in 300 days, 20 hours every days, generating effective output 6000KW (actual capacity), rated power factor: 0.8 gross output 6000KW * 0.8=4800KM;
20 hours X300 days=28800000 degree of annual electricity generating capacity 4800KW X;
Annual electricity generating capacity 28800000 is spent 0.35 yuan of X/degree (electric network access valency)=10080000 yuan.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention provides following embodiment:
The electricity-generating method step of metallurgy industry medium temperature and medium pressure steam and low-pressure saturated steam of utilizing provided by the invention is as follows:
1, a small amount of coal gas producing is collected, and by the heated by gas burning boiler of collecting.
2, burning boiler produces medium temperature and medium pressure steam, is input to steam turbine main steam interface, pushing turbine rotation, and steam turbine drives generator to generate electricity.
3, low-pressure saturated steam is input to steam-water separator, be dried by steam-water separator, dried low-pressure saturated steam is assigned to steam turbine auxiliary steam interface and oxygen-eliminating device by mortor operated valve, is used to steam turbine to add auxiliary force and moves, simultaneously for condensed water deoxygenation is carried out in oxygen-eliminating device heating.
4, the exhaust steam after acting enters into exhaust steam condensation device, becomes water of condensation after condensation, and water of condensation, by after oxygen-eliminating device deoxygenation, is added in boiler feed water again.
5, in the time inputting without low-pressure saturated steam, close mortor operated valve, cut off steam turbine auxiliary steam interface channel, oxygen-eliminating device heating steam interface and steam-out (SO) are connected, and utilize steam-out (SO) to heat deoxygenation.Press 6MW Power Plant Design, its scale is 1 6MW medium temperature and medium pressure sucking condensing type Turbo-generator Set, joins 1 35t/h medium temperature and medium pressure burning boiler, 1 4.6m3 steam-water separator.Its fuel is blast furnace gas, coal gas of converter.Need supplement again rich saturated vapour.
About coal gas amount: in the present embodiment, adopt steelmaking converter tail gas in metallurgy industry and blast furnace gas as combustion gas, and after this is collected, be input in burning boiler by gas pipe, wherein,
For generating coal gas of converter amount: 0.9 ten thousand Nm3/h
For generating coal gas of converter calorific value: 1359Kcal/Nm3
For coal for power generation atmospheric pressure: 10kPa
For generating blast furnace coal tolerance: when 1.2 ten thousand Nm3/h(boilers steam and are 30 t/h, needing blast furnace coal tolerance is 1.2 ten thousand Nm3/h, and boiler steams while being 24 t/h, and needing blast furnace coal tolerance is 0.5 ten thousand Nm3/h)
For generating blast furnace gas calorific value: 800 Kcal/Nm3
For coal for power generation atmospheric pressure: 10kPa
Above coal gas amount is produced 35t/h steam not, and blast furnace gas fuel is provided in the present embodiment separately.
Close steam about low pressure is full, in the present embodiment, adopt steam and the rolling line that the steelmaking converter in metallurgy industry produces to produce steam, wherein,
Converter Steam amount :～12.5t/h
Vapor pressure: 0.6MPa(g)
Vapor (steam) temperature: saturated
Rolling line steam flow: 1.8～3t/h
Rolling line vapor pressure: 0.6MPa(g)
Rolling line vapor (steam) temperature: saturated
The burning boiler of selecting in the present embodiment:
Rated capacity: 35t/h
Nominal steam pressure: 3.82MPa
Nominal steam temperature: 450 DEG C
The steam turbine of selecting in the present embodiment:
Rated power: 6MW
Main steam pressure: 3.43MPa
Main steam temperature: 435
Main steam flow: 22.5t/h(rated point when 30t/h when not filling (rated point)/filling)
Filling pressure: 0.5MPa
Filling temperature: saturated
Filling flow: not filling when 15t/h(winter heating)
Declared working condition exhaust steam pressure: 8.3kPa
Specified/the highest coolant water temperature: 20 DEG C/33 DEG C
Rated speed: 3000r/min
The generator of selecting in the present embodiment:
Rated power: 6000kW
Voltage rating: 10500V
Rated speed: 3000r/min
The steam-water separator of selecting in the present embodiment:
Volume: 4.6m3
Design pressure: 1.5Mpa
Design temperature: 250 DEG C
This engineering is selected 1 thermal deaerator, the oxygen-eliminating device 40t/h that exerts oneself, and deoxygenation water tank actual volume is 28.5 m
3.
In the present embodiment, burning boiler temperature of exhaust fume is 160 DEG C, and flue gas is sent into desulfurizer by burning boiler back-end ductwork through induced draught fan, and the clean flue gas after desulfurization enters atmosphere from chimney.
The combustion gas of this engineering is made up of blast furnace and coal gas of converter, and coal gas is delivered to stokehold by aerial pipeline, causes the burner of boiler front side, and burner adopts individual layer to arrange, while opening stove, lights a fire with liquid gas.
This engineering is established the condensate pump of 2 110% capacity, an operation, and one is for subsequent use.Condensing water conduit is provided with recirculation pipe to vapour condenser, the minimum discharge requirement of condensate pump when ensureing low-load.
Claims (3)
1. metallurgy industry medium temperature and medium pressure steam and low-pressure saturated steam electricity generating device, is characterized in that,
It comprises steam turbine, and for steam-energy being converted to mechanical rotation function, steam turbine arranges end and is provided with main steam interface, and middle part is provided with auxiliary steam interface, and afterbody is provided with exhaust steam exhaust port;
Comprise generator, for the power of steam turbine output is generated electricity; Generator is connected with the output of steam turbine;
Comprise low-pressure saturated steam access device, be connected with steam turbine auxiliary steam interface, for steam turbine provides auxiliary steam;
Comprise exhaust steam condensation device, for by acting after exhaust steam be converted into water of condensation, exhaust steam condensation device be connected to steam turbine afterbody exhaust steam exhaust port;
Comprise oxygen-eliminating device, for by water of condensation deoxygenation; Oxygen-eliminating device water of condensation water intake is connected with condensation device, and water outlet is connected with boiler water-feeding device; Heating steam interface is connected with low-pressure saturated steam access device; Oxygen-eliminating device heating steam interface is connected with steam-out (SO) simultaneously;
Comprise burning boiler, burn for gathering unnecessary coal gas, and produce medium temperature and medium pressure steam; Burning boiler steam (vapor) outlet is connected with steam turbine main steam interface.
2. a kind of metallurgy industry medium temperature and medium pressure steam as claimed in claim 1 and low-pressure saturated steam electricity generating device, it is characterized in that, described low-pressure saturated steam access device comprises steam-water separator and mortor operated valve, on steam-water separator, be provided with low-pressure saturated steam import, be used for inputting low-pressure saturated steam, on steam-water separator, be also provided with low-pressure saturated steam outlet, be connected with mortor operated valve, mortor operated valve is connected with steam turbine auxiliary steam interface and oxygen-eliminating device heating steam interface respectively.
3. metallurgy industry medium temperature and medium pressure steam and low-pressure saturated steam electricity-generating method, comprises following steps:
3.1, a small amount of coal gas producing is collected, and by the heated by gas burning boiler of collecting;
3.2, burning boiler produces medium temperature and medium pressure steam, is input to steam turbine main steam interface, pushing turbine rotation, and steam turbine drives generator to generate electricity;
3.3, low-pressure saturated steam is input to steam-water separator, be dried by steam-water separator, dried low-pressure saturated steam is assigned to steam turbine auxiliary steam interface and oxygen-eliminating device by mortor operated valve, be used to steam turbine to add auxiliary force and move, simultaneously for condensed water deoxygenation is carried out in oxygen-eliminating device heating;
3.4, the exhaust steam after acting enters into exhaust steam condensation device, becomes water of condensation after condensation, and water of condensation, by after oxygen-eliminating device deoxygenation, is added in boiler feed water again;
3.5, in the time inputting without low-pressure saturated steam, close mortor operated valve, cut off steam turbine auxiliary steam interface channel, oxygen-eliminating device heating steam interface and steam-out (SO) are connected, and utilize steam-out (SO) to heat deoxygenation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113374539A (en) * | 2021-06-09 | 2021-09-10 | 攀钢集团攀枝花钢钒有限公司 | Steam inlet control system of double-cylinder double-pressure waste heat generating set and steam supplementing control method thereof |
| CN114132983A (en) * | 2021-11-15 | 2022-03-04 | 山东钢铁集团日照有限公司 | Oxygen removing device capable of providing high-temperature condensed water |
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| CN114132983B (en) * | 2021-11-15 | 2023-10-31 | 山东钢铁集团日照有限公司 | Deoxidizing device capable of providing high-temperature condensed water |
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Application publication date: 20140702 |