CN101761364B - Method for generating electricity by using low-pressure saturated steam - Google Patents
Method for generating electricity by using low-pressure saturated steam Download PDFInfo
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- CN101761364B CN101761364B CN2009102514846A CN200910251484A CN101761364B CN 101761364 B CN101761364 B CN 101761364B CN 2009102514846 A CN2009102514846 A CN 2009102514846A CN 200910251484 A CN200910251484 A CN 200910251484A CN 101761364 B CN101761364 B CN 101761364B
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Abstract
The invention discloses a method for generating electricity by using low-pressure saturated steam. An electric generator is started by adopting such two levels of pressure steam as main steam and supplementary steam. The main steam is transmitted into a high pressure stage of a supplementary steam condensing steam turbine after voltage stabilization by a self-operated adjusting valve. The supplementary steam is transmitted into a low pressure stage of the supplementary steam condensing steam turbine. The main steam and the supplementary steam push the supplementary steam condensing steam turbine to rotate and the supplementary steam condensing steam turbine drives the electric generator to generate electricity. The invention is characterized as follows: 1. the invention directly uses saturated steam to generate electricity without steam super heating by using supplementary-burning boilers such as a superheated steam boiler and the like. The invention prevents environmental pollution and extra fuel consumption. Moreover, system complexity is low and productive maintenance is simple; and 2. the invention adopts higher pressure level of converter-vaporization saturated steam as a main steam source, and incorporates a certain flow of lower pressure level of heating furnace-vaporization saturated steam after a machine group regulating stage. The invention uses supplementary steam condensing steam turbine electric generating sets to generate electricity, thereby making full use of enterprise saturated steam source and resulting in higher cascade utilization rate of the source.
Description
Technical field
The present invention relates to the low-pressure saturated steam technical field of power generation, be applicable to that method, particularly smelter that enterprise such as metallurgy utilizes low-pressure saturated steam to generate electricity utilize the method for converter and the generating of oven vaporization recovered steam.
Background technique
Smelter is in consumes energy; Can produce secondary energy such as converter vaporization recovered steam, oven vaporization recovered steam again; The energy that they carry belongs to low temperature exhaust heat, is a kind of low-grade saturated vapour resource, is characterized in that pressure is low, water content is big.If insufficient being used, then a large amount of residual heat resources will slattern in vain.
At present, the utilization for above-mentioned steam resource roughly has dual mode: a kind of is heat utilization, directly utilizes its heat energy to supply to produce or living needs, and its utilization ratio is very low; Another kind is to convert thereof into conveying easy to use electric energy flexibly, mainly contains following several kinds of modes:
1) adopts the Steam Power Circulation cogeneration technology of being with additional combustion boiler, as using overhead steam boiler.Be characterized in overhead steam boiler, being heated to saturated vapour than higher parameter, make it become high-grade superheated vapor, generate electricity through the Turbo-generator Set of routine again with fuel.The shortcoming of this technology is: (1) owing to used overhead steam boiler, the whole system more complicated, and operation maintenance is cumbersome; (2) pollute greatly additive decrementation fuel, waste resource.Just to utilizing low-grade saturated vapour resource to have to add a cover additional combustion boiler, be uneconomic.
2) directly utilize converter vaporization recovered steam, adopt the exhaust heat recovery power generation of the hot merit ability that dehumidifies again in the band machine to generate electricity with condensing turbine.This technology is just utilized the generating of converter vaporization recovered steam merely, and is not used for pressure oven vaporization recovered steam resource on the low side, and the cascade utilization rate of the energy is on the low side.
Summary of the invention
The technical problem that the present invention will solve provides a kind of electricity-generating method that utilizes low-pressure saturated steam, and the low-pressure saturated steam of different pressures grade all is fully utilized, have the investment little, operating cost is low, the daily management characteristic of simple.
For solving the problems of the technologies described above; The electricity-generating method of low-pressure saturated steam that utilizes provided by the invention adopts main vapour and filling two-stage steam to start; Main vapour is imported the high pressure section 6 of filling condensing steam turbine 18 after the direct-operated regulator voltage stabilizing; The low pressure stage 8 of filling input filling condensing steam turbine 18, filling and main vapour promote filling condensing steam turbine 18 and rotate, and filling condensing steam turbine 18 drives generator 9 generatings.
In order to make full use of afterheat steam; Pressure type pressure regulative mode before pressure before main vapour and the filling input filling condensing steam turbine 18 is regulated and adopted; Pressure type pressure regulative mode is before so-called, when the vapor pressure before the input filling condensing steam turbine 18 is high, opens the atmos-valve flow; Let more steam get into filling condensing steam turbine 18 as far as possible, increase generated energy; When the vapor pressure before the input filling condensing steam turbine 18 is low, reduce the air valve flow, keep the initial steam pressure of filling condensing steam turbine 18, reduce generated energy.
The power generating equipment of utilizing low-pressure saturated steam provided by the invention is that the high pressure section 6 of main vapour generating means 1, self-contained pressure regulator 3, main vapour quick-closing valve 5, filling condensing steam turbine 18 is linked in sequence by steam conveying pipe; The low pressure stage 8 that steam control valve 7, filling condensing steam turbine 18 are joined in filling generating means 11, filling quick-closing valve 13, filling is linked in sequence by steam conveying pipe; Filling condensing steam turbine 18 drives generator 9 generatings.
Relative background technique, the present invention has following characteristics:
1) directly utilizes saturated vapour generating, do not adopt additional combustion boiler such as overhead steam boiler to carry out the Overheating Treatment of steam, avoided environmental pollution and extra fuel consumption, and system complexity is low, the production easy maintenance.
2) utilize the higher converter vaporization saturated vapour of pressure rating to be main vapour source; The pressure rating oven vaporization saturated vapour on the low side of also behind the unit governing stage, incorporating certain flow into; Utilize the generating of filling condensing steam turbine generator group; Thereby made full use of the saturated vapour resource of enterprise, the cascade utilization rate of resource is higher; Under the situation of main vapour source interruption, filling can be kept unit operation, guarantees that generator set is not interrupted frequent off-the-line because of converter system production.
3) pressure type pressure regulative mode before main steam adopts.Normal generator set adopts permanent power adjustments, promptly when pressure is high before the machine, closes the minor adjustment porthole, when pressure before the machine is low, opens big adjusting porthole, and it is constant to keep the unit generation amount.This unit is in order to make full use of afterheat steam, to have adopted the pressure regulative mode of preceding pressure adjusting, promptly when pressure is high before the machine, open big adjusting porthole, let more recovered steam get into steam turbine and generate electricity, increase generated energy as far as possible; When pressure before the machine is low, close the minor adjustment porthole, keep the unit initial steam pressure, the generated energy of unit reduces.Simultaneously; In order to solve the oxygen blast simultaneously of three block converters, evaporation generating capacity too high problem of moment is set up the self-erecting type pressure regulator valve on live steam piping; When moment, main vapour pressure surpassed the unit initial steam pressure; The self-erecting type modulating valve is opened automatically, and the steam of pressure peak is leaked into the bigger low pressure steam pipe network of capacity, guarantees that steam does not diffuse.Pressure type pressure regulative mode before this is fully used steam.
4) set up steam-water separator before main vapour, the filling mouth, guarantee out mass dryness fraction >=99.5% of vapour; Before each pressure level of the through-flow part of steam turbine hydrophobic groove is set, the laser hardening processing is carried out on last I and II blade vapour limit, and the three grades of dividing plates in end are provided with the hydrophobic circular groove of dehumidifying.
5) utilize condensate pump to reclaim water of condensation and utilization again, pump motor adopts converter technique, has adapted to unit load and has changed characteristics greatly.
Description of drawings
Below in conjunction with accompanying drawing the present invention is elaborated
Fig. 1 utilizes the electricity-generating method technological process of low-pressure saturated steam
Embodiment
Design philosophy of the present invention is:
1 thermodynamic system
Main vapour and filling get into steam turbine work done generating, and exhaust steam gets into vapour condenser and condenses, and is pooled in the hot well, and water of condensation is delivered to plant area's soft water station recycle through condensate pump through the pipeline that newly lays.Main vapour is established pipeline and is inserted the power station from the saturated vapour that converter vaporization cooling produces, and simultaneously one group of self-powering type vapor pressure modulating valve has been installed on this pipeline, has improved and stablized the main initial steam pressure of unit.Filling is established pipeline and is inserted the power station from the oven boil-off.To the moisture big shortcoming of saturated vapour, also set up water separator at the unit steam admission side, to guarantee unit admission mass dryness fraction, guarantee safe operation.Required moisturizing when turbine condenser starts connects the soft water pipe network from plant area, and establishes pipeline and insert the power station.
2 clean circulations
System adopts industrial water purification open-circuit system, is that Turbo-generator Set vapour condenser, oil cooler and air cooling device supply water, and supplies water and adopts the pressurization of pump group to supply water, and the recycling water utilization overbottom pressure directly goes up and arrives cooling tower, is back to absorbing well, absorption well after cooling and recycles.Be provided with valveless filter, piping filter and medicine system in the system, to guarantee quality of water supply.
3 electrical design
1) high-pressure system
Generator outlet is established the 10KV voltage bus, and system is the single bus scheme mode, establishes the generator outlet circuit breaker respectively and is incorporated into the power networks network interconnecting circuit, and generator synchronous point is located on the generator outlet circuit breaker.
2) low service system
The low-voltage-powered two-way power supply power supply of generator 380V, the one tunnel connects the low pressure station service transformer of spontaneous motor 10KV system busbar, and one the tunnel connects from pumping station.
4, control system
1) regulating system of steam turbine set has adopted the hydraulic executing system that 505 digital electric-hydraulics speed regulator+Siemens of U.S. WOODWARD company production makes, and can realize pressing adjusting before the vapor pressure.The filling system adopts steam turbine to carry the low steam control valve that is press-fitted, by Siemens S-300 control system system control filling pressure and flow.
2) dispose Bentley 3500 detection systems, can detect each vibration of unit, displacement and the difference situation that expands.
3) adopted Siemens S-300 control system, can show relevant operation information, be convenient to the operations staff runnability of generator set is kept watch on and controlled.
4) simultaneously pumping plant appearance control system is upgraded, adopted the DCS control system, to guarantee the stable of water system.
The saturated vapour that produces with the converter cooling system of iron and steel enterprise is below explained the present invention with the example that is utilized as of the steam of oven evaporated cooling system generation.
As shown in Figure 1; Low-pressure saturated steam electrification technique as well as flow process is following: the saturated vapour that main vapour produces from converter vapourization cooling system 1; On the steam line of its conveying, be provided with self-powering type pressure regulator 3; When main vapour pressure is too high, with part steam diversion to plant area steam pipe system 2, to reduce the fluctuation of converter vaporization saturated vapour.Saturated vapour after voltage stabilizing is sent into main vapour steam-water separator 4 again, gets into turbine high-pressure section 6 through main vapour quick-closing valve 5 again; Filling is from oven evaporated cooling system 11; It sends into filling steam-water separator 12 through pipe special; Again through filling quick-closing valve 13 and the low steam control valve 7 that is press-fitted; Send into steam turbine low-pressure section 8 by the filling mouth of steam turbine, steam carries out transformation of energy in steam turbine, and steam turbine drawing generator 9 generates electricity; Exhaust steam after the acting gets into vapour condenser 17, and water of condensation is then sent into through frequency conversion condensate pump 16 and concentrated soft water station 15, after sending into plant area's soft water pipe network 10 after the water pump pressurization, supplies converter vapourization cooling system again) and 11 recycles of oven evaporated cooling system.The saturated main steam that produces from converter vapourization cooling system 1 gets into steam turbine from different positions respectively with the filling from oven evaporated cooling system 11.In order to make full use of afterheat steam, the pressure regulative mode that the present invention has adopted preceding pressure to regulate is promptly opened big adjusting porthole when pressure is high before the machine, lets more recovered steam get into steam turbine as far as possible and generates electricity, and increases generated energy; When pressure before the machine is low, close the minor adjustment porthole, keep the unit initial steam pressure, the generated energy of unit reduces.
System adopts industrial water purification closed circuit circulatory system, for Turbo-generator Set vapour condenser, oil cooler and air cooling device supply water.Supply water to adopt the pressurization of pump group to supply water, the recycling water utilization overbottom pressure directly goes up and arrives cooling tower 14, is back to absorbing well, absorption well after cooling and recycles.Be provided with valveless filter, piping filter and medicine system in the system, to guarantee quality of water supply.
Generator outlet is established the 10KV voltage bus, and system is the single bus scheme mode, establishes the generator outlet circuit breaker respectively and is incorporated into the power networks network interconnecting circuit, and generator synchronous point is located on the generator outlet circuit breaker.Generator set and site are located at electric substation, adopt cable run.The power supply of the low-voltage-powered employing two-way of generator 380V power supply.
The hydraulic executing system that 505 digital electric-hydraulics speed regulator+Siemens that the regulating system of steam turbine set has adopted U.S. WOODWARD company to produce makes; The filling system adopts steam turbine to carry the low steam control valve that is press-fitted, by Siemens S-300 control system system control filling pressure and flow.Adopt Bentley 3500 detection systems.
Main power generating equipment of the present invention is following:
1) thermodynamic system equipment mainly comprises filling condensing steam turbine generator, condenser, concentrates oily station, condensate pump, water-jet pump, water separator, self-powering type vapor pressure controlling device and valve etc.;
2) clean circulation equipment mainly comprises cooling tower, pond, raw water service pump group, valveless filter, piping filter, medicine machine and valve etc.;
3) high low pressure electrical system equipment mainly comprises high-low voltage electric power distribution cabinet, excitation device, protection equipment for generator etc.;
4) control system equipment mainly comprises System for Steam Turbine device, unit vibration detection device, PLC control system and one-shot measurement device.
Filling condensing steam turbine group is produced by Hangzhou Zhongneng Steam Turbine Co., Ltd., rated power 9000kw/h.The steam that this steam turbine set is rolled about 45～55t/h that three block converter evaporated cooling systems produce, pressure 2.0Mpa with a steel is as main vapour source, and the oven boil-off of behind the unit governing stage, incorporating 10t/h, pressure 0.8Mpa into simultaneously is as filling.
Filling condensing steam turbine group has A, B, three point of admissions of C, and its major parameter is:
The A point. normal point
Initial steam pressure: 2.0 (scope 1.9～2.2) Mpa (A) throttle (steam) temperatures: saturation temperature
Exhaust steam pressure: 0.007Mpa (A) admission flow: 45t/h
Filling pressure: 0.65 (scope 0.6～0.8) Mpa (A) filling temperature: saturation temperature
Filling flow: 10t/h circulating water temperature: 25 ℃ (maximum 34 ℃)
Quantity of circulating water: 4000t/h
Generated output: 9015kw
The B point. maximum point
Initial steam pressure: 2.0 (scope 1.9～2.2) Mpa (A) throttle (steam) temperatures: saturation temperature
The maximum admission flow of exhaust steam pressure: 0.007Mpa (A): 55t/h
Filling pressure: 0.65 (scope 0.6～0.8) Mpa (A) filling temperature: saturation temperature
Maximum filling flow: 15t/h circulating water temperature: 25 ℃ (maximum 34 ℃)
Quantity of circulating water: 4900t/h
Generated output: 11550kw
The C point. smallest point
Initial steam pressure: 2.0 (scope 1.9～2.2) Mpa (A) throttle (steam) temperatures: saturation temperature
Exhaust steam pressure: 0.007Mpa (A) admission flow: 0t/h
Filling pressure: 0.65 (scope 0.6～0.8) Mpa (A) filling temperature: saturation temperature
Filling flow: 10t/h circulating water temperature: 25 ℃ (maximum 34 ℃)
Quantity of circulating water: 750t/h
Generated output :～200kw
The generator set major parameter
Rated power: 12MW
Voltage rating: 10.5KV
Rated speed: 3000r/min
Frequency: 50Hz.
Claims (5)
1. an electricity-generating method that utilizes low-pressure saturated steam adopts main vapour and filling two-stage steam to start, and main vapour is imported the high pressure section (6) of filling condensing steam turbine (18) after the direct-operated regulator voltage stabilizing; The low pressure stage (8) of filling input filling condensing steam turbine (18); Filling and main vapour promote filling condensing steam turbine (18) and rotate, and filling condensing steam turbine (18) drives generator (9) generating, it is characterized in that; Pressure type pressure regulative mode before the preceding pressure of main vapour and filling input filling condensing steam turbine (18) is regulated and adopted; Pressure type pressure regulative mode is before said, when the preceding vapor pressure of input filling condensing steam turbine (18) is high, opens the atmos-valve flow; Let more steam get into filling condensing steam turbine (18) as far as possible, increase generated energy; When the preceding vapor pressure of input filling condensing steam turbine (18) is low, reduce the air valve flow, keep the initial steam pressure of filling condensing steam turbine (18), reduce generated energy.
2. the electricity-generating method that utilizes low-pressure saturated steam as claimed in claim 1 is characterized in that, main vapour carries out carbonated drink with filling at the preceding process earlier of input filling condensing steam turbine (18) steam-water separator to be separated, and improves more than the mass dryness fraction to 99.5% of steam.
3. the electricity-generating method that utilizes low-pressure saturated steam as claimed in claim 1; It is characterized in that; Each pressure level of flow passage component at described filling condensing steam turbine (18) is provided with the water delivery groove; The laser hardening processing is carried out on I and II blade vapour limit, end, and the three grades of isolating plates in end are provided with the hydrophobic circular groove of dehumidifying.
4. the electricity-generating method that utilizes low-pressure saturated steam as claimed in claim 1; It is characterized in that; Main vapour and the filling exhaust steam after filling condensing steam turbine (18) acting gets into vapour condenser (17), and water of condensation is sent into through frequency conversion condensate pump (16) and concentrated soft water station (15).
5. the electricity-generating method that utilizes low-pressure saturated steam as claimed in claim 5; It is characterized in that; Adopt industrial water purification closed circuit circulatory system vapour condenser (17) to supply water; Supply water to adopt the pressurization of pump group to supply water, the recycling water utilization overbottom pressure directly goes up and arrives cooling tower (14), is back to absorbing well, absorption well after cooling and recycles.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101886556B (en) * | 2010-06-28 | 2011-10-26 | 青岛捷能汽轮机集团股份有限公司 | Steam compensating turbine |
| CN101922315B (en) * | 2010-09-16 | 2011-10-26 | 青岛捷能汽轮机集团股份有限公司 | Steam supplementing type turbine and steam supplementing device thereof |
| CN102562189B (en) * | 2012-03-14 | 2015-07-08 | 思安新能源股份有限公司 | Low-pressure saturated steam recycling equipment |
| CN103033235A (en) * | 2012-12-19 | 2013-04-10 | 中国船舶重工集团公司第七�三研究所 | Flushing-type water level gauge with remote quick closing device |
| CN103470322A (en) * | 2013-08-21 | 2013-12-25 | 江苏凯茂石化科技有限公司 | Formaldehyde process device capable of comprehensively recycling heat energy of byproduct steam |
| CN103527273B (en) * | 2013-10-21 | 2015-07-08 | 上海交通大学 | Passive type organic working medium generating set |
| CN103899365A (en) * | 2014-03-02 | 2014-07-02 | 成都成发科能动力工程有限公司 | Power generation device and method using medium-temperature and medium-pressure steam and low-pressure saturated steam in metallurgical industry |
| CN105089723B (en) * | 2015-09-10 | 2016-12-07 | 昆明理工大学 | A kind of saturated vapor directly enters the device of turbine expansion generating |
| CN113374539B (en) * | 2021-06-09 | 2022-07-19 | 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 |
| CN114643292B (en) * | 2022-03-17 | 2023-06-30 | 河北鑫达钢铁集团有限公司 | Strip steel cooling device |
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Application publication date: 20100630 Assignee: ANHUI XINCHUANG ENERGY-SAVING ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Assignor: Ma'anshan Iron and Steel Co., Ltd. Contract record no.: 2013340000076 Denomination of invention: Method for generating electricity by using low-pressure saturated steam Granted publication date: 20120530 License type: Exclusive License Record date: 20130527 |
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Address after: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |
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Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Patentee after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Patentee before: Ma'anshan Iron and Steel Co., Ltd. |