CN101806395B - Regulating method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises - Google Patents
Regulating method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises Download PDFInfo
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Abstract
The invention relates to a regulating method of pressure stabilization of a public steam pipe network for low-pressure production of iron and steel enterprises, belonging to the technical field of a regulating method of pressure of a pipe network. The invention is used for solving the problem of pressure stabilization of a public steam pipe network caused by frequent large-amplitude fluctuation because of unstable consumption of external steam users. The invention has the technical scheme that the control mode of a synchronized steam regulating valve arranged behind a heat accumulator is downstream flow regulation, and the set upper limit of flow is 30-35t/h; when a steam turbine operates, the pressure, the temperature and the vacuum degree of a pressure equalizing box are improved; and a'rotating barrier' of a steam turbine of a power plant is used for steam extraction to replace a temperature and pressure reducer for supplying steam to an external steam pipe network for low-pressure production. The measures improve the stability and the adaptability of steam source equipment to finally achieve the purposes of still ensuring the stabilization of the pressure of the steam pipe network for enterprises, simultaneously increasing the recovery amount of steam and improving the comprehensive utilization efficiency of energy sources when users with larger fluctuation exist in the steam pipe network and a large amount of fluctuation exists in recovery users.
Description
Technical field
The present invention relates to iron and steel enterprise's mesolow and produce a kind of adjusting method of the public pipe network pressure stability of steam, belong to ductwork pressure regulating method technical field.
Background technique
In iron and steel enterprise, steam many users are arranged, some user's steam consumptions are more stable, some users are because the reason steam consumption of production technology is extremely unstable, the highest and minimum mutually far short of what is expected, therefore cause the pressure surge of steam pipe system very large, be difficult to guarantee the stable of pressure.Simultaneously, some user of steel mill is very tight again to the stability requirement of vapor pressure, must be between 0.85～0.98MPa as the low pressure steam pressure that steel-making requirements is supplied with, its afterheat steam of " vaporizing cooling " recovery will be incorporated the external steam pipe network into and also require the vapor pressure of pipe network relatively stable, just can be conducive to the recovery of afterheat steam.
And in iron and steel enterprise, along with the development of cycle energy-saving technology, the recovery of steam and effectively utilize and become energy-saving and cost-reducing trend is so the vapour source of the public pipe network of steam has just formed multiple vapour source and vapour carries out a kind of mode of steam supply jointly to steam pipe system.How to solve the impact that various steam user fluctuation and Steam Recovery cause pipe network, guarantee stable task and the difficult problem that becomes each enterprise of ductwork pressure.
Usually the low pressure of iron and steel enterprise is produced steam pipe system three main steam supply source, is respectively power plant for self-supply, steel-making Steam Recovery, hot rolling Steam Recovery.Steam the user mainly contain: steel-making, ironmaking, hot rolling, coking, public auxiliary system etc.Wherein make steel due to production technology, cause the consumption of steam extremely unstable, maximum 40t/h, minimum 10t/h, and change extremely frequent.Before the invention process, low pressure is produced the steam supply of steam pipe system and mainly by power plant for self-supply's reducing-and-cooling plant, high temperature and high pressure steam pressure and temperature reducing to 0.98～0.90MPa is carried out feed, this kind mode is when causing energy significant wastage, to pressure controlled hysteresis, make the pressure of steam pipe system fluctuate widely due to reducing-and-cooling plant.The constant-pressure control mode is taked in the recovery of steel-making and hot rolling steam simultaneously, above-mentioned afterheat steam yield is changing suddenly or STEELMAKING PRODUCTION when unexpected with steam, certainly will cause that the external steam ductwork pressure fluctuates suddenly, reducing-and-cooling plant can not in time accurately carry out the adjusting of vapor pressure again, has more aggravated the fluctuation of steam pipe system pressure.Cause the frequent take-off of reducing-and-cooling plant outlet side safety valve, the pipeline of reducing-and-cooling plant outlet side valve and external steam pipe network, for a long time under the vapor pressure effect of alternation significantly, the serious accidents such as the valve flanges pad is revealed, the steam pipe system pipe welding seam breaks repeatedly occur, the production of making steel is caused seriously influence.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of adjusting method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises, this method can solve multiple steam source and automotive when capable, because external steam user consumption is unstable and often produce the problem of the public pipe network pressure stability of steam that fluctuation causes.
The technological scheme that solves the problems of the technologies described above is:
A kind of adjusting method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises, it adopts following steps:
(1) control mode that is arranged on the steam regulation valve that is incorporated into the power networks after thermal accumulator is Flow-rate adjustment after valve, is limited to 30～35t/h on the flow of setting;
(2) when steam turbine operation, the High Temperature High Pressure initial steam of boiler is introduced surge tank by manually operated valve, to send the shaft seal stripping temperature to be controlled to be 265～280 ℃, Main Steam Temperature Control to 540～532 ℃, shaft seal steam pressure bring up to 0.08～0.085MPa, unit degree of vacuum and be-80～-88Kpa.
The adjusting method of above-mentioned pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises, adopt power plant's sucking condensing turbine capable of regulating " rotating barrier " to draw gas to substitute reducing-and-cooling plant to produce steam pipe system to outer low pressure and carry out steam supply:
(1) according to the demand of steel-making, be 0.90～0.95Mpa with the pressure setting that draws gas;
(2) steam turbine electro-hydraulic governing system is exported the PID electrical signal after the steam pipe system pressure signal that detects is calculated judgement, converts the electrical signal to simultaneously the hydraulic pressure signal of medium pressure servo-motor;
(3) control with this hydraulic pressure signal the pressure that steam turbine " rotating barrier " is adjusted the steam outer net.
The adjusting method of above-mentioned pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises, the pressure setting that described sucking condensing turbine capable of regulating " rotating barrier " draws gas is 0.9～0.95Mpa.
The adjusting method of above-mentioned pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises, vapour externally carries out feed steam jointly to adopt at least two sucking condensing turbines to draw gas also, when the steam user use amount of outer net increased suddenly, two extracted steam from turbine systems adjusted simultaneously.
The adjusting method of this pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises of the present invention has following beneficial effect:
1. the recovery of steel-making steam is reclaimed by original constant-pressure and is changed the flow setting type recovery into, has successfully solved unexpected variation of steel-making afterheat steam recovery flow steam pipe system is produced impact;
2. in steam turbine operation process, solve steam turbine by three kinds of ways that improve surge tank pressure, improve surge tank temperature, gas clean-up and thrown the amount of drawing gas when fluctuating widely, the problem that the negative swollen difference of steam turbine exceeds standard and trips has changed sucking condensing turbine and can not adapt to the state that the amount of drawing gas significantly changes;
3. draw gas with sucking condensing turbine capable of regulating " rotating barrier " and substitute reducing-and-cooling plant and produce steam pipe system to outer low pressure and carry out steam supply, because extracted steam from turbine can in time be followed the tracks of, regulate, greatly reduce the pressure wave momentum of steam outer net, stablized the pressure of whole steam outer net.
Above-mentioned these measures and effect have improved the Stability and adaptability of vapour source device, finally reaching has than the user of great fluctuation process in steam pipe system and reclaims when in the user, a large amount of fluctuation being arranged, still can guarantee the stable of enterprise's steam pipe system pressure, increase simultaneously amount of steam withdrawn, improve the efficient of comprehensive utilization of energy.
Embodiment
Specific embodiments of the present invention is as follows:
(1) constant-pressure of the recovery mountain plateau of steel-making steam reclaims, and changes the flow setting type take-back model into, has successfully solved unexpected variation of steel-making afterheat steam recovery flow steam pipe system is produced the problem of impacting.The vapor pressure that the steel works heat recovery produces is 2.5～3.0MPa, the pressure of external steam pipe network is 0.9～0.98MPa, incorporate if adopt steel-making steam the regulative mode that the pipeline network regulation downstream pressure is controlled the steam flow that is incorporated into the power networks into, can cause the steel-making steam flow that is incorporated into the power networks significantly to increase suddenly (maximum increase 40～60t/h) during bessemerizing, cause that other vapour source points of steam pipe system vapour pressure that is incorporated into the power networks raises, thereby cause whole steam pipe system pressure fluctuation.Consider the steel-making recovered steam bessemerize with blow off during pressure flow change large characteristics, change the control mode that is arranged on the steam regulation valve that is incorporated into the power networks after thermal accumulator, regulated changing Flow-rate adjustment after valve into by downstream pressure.On the basis of dropping into steel-making thermal accumulator recovered steam, setting steel-making steam is incorporated into the power networks and is limited to 30～35t/h on flow after modulating valve, the recovered steam amount is controlled in unlatching by modulating valve, the impact of minimizing to outside steam pipe system, modulating valve and thermal accumulator cooperatively interact and have extended the time that steam is incorporated into the power networks, and have stablized the pressure of external steam pipe network.
(2) in the steam turbine operation process, by improve surge tank pressure, improve the surge tank temperature, three kinds of main ways improving vacuum have solved steam turbine and have thrown the amount of drawing gas when fluctuating widely, the problem that the negative swollen difference of steam turbine exceeds standard and trips has changed sucking condensing turbine and can not adapt to the present situation that the amount of drawing gas significantly changes.It is as follows that Operational Limits is adjusted: will send the shaft seal stripping temperature by 160～180 ℃ bring up to 265～280 ℃, suitably control main steam temperature to 540～532 ℃, shaft seal steam pressure by 0.04～0.045MPa bring up to 0.08 present～0.085MPa, improve unit degree of vacuum by-77～-75KPa brings up to-86～-88KPa.
Because steam turbine is the diaphragm type structure, namely moving vane is inlaid on the outer rim of wheel disc, and nozzle is contained on dividing plate, and the outer rim of dividing plate embeds on cylinder inner wall in corresponding conduit.This kind structure causes the high-temperature steam inwall Flow Structure Nearby at the close cylinder of steam turbine in steam turbine, and it is more obvious that heating (or cooling) effect of heating (or cooling) the effect comparison rotor of the variation countercylinder of steam turbine steam inside flow shows.When the extracted steam from turbine amount changes in a large number, the steam flow that the later blade pass at different levels of extraction opening are crossed can obviously reduce, the thermal insulation layer of cylinder outside can effectively be organized the cooling of cylinder, turbine rotor " cools down " by the conduction of heat of wheel disc, cause steam turbine to occur negative swollen poor, trip during over-2.5mm when negative swollen difference.structural feature and the negative swollen poor mechanism that forms for steam turbine, measure of the present invention is that the High Temperature High Pressure initial steam of boiler is introduced surge tank by manually operated valve, to send the shaft seal stripping temperature to bring up to 265～280 ℃ by 160～180 ℃, while suitable control main steam temperature to 540 in service～532 ℃, the shaft seal steam pressure is brought up to 0.08 present～0.085MPa by 0.04～0.045MPa, improve unit degree of vacuum by-77～-75KPa brings up to-86～-88Kpa, by these methods, the swollen difference of effectively having controlled unit-1.5～-1.8mm between, be starkly lower than alarming value (2.5mm), improved steam turbine to the stability of the ability of outer net steam supply and unit with to the adaptability of the quantitative change of drawing gas.
(3) adopt power plant's sucking condensing turbine capable of regulating " rotating barrier " to draw gas to substitute reducing-and-cooling plant to produce steam pipe system to outer low pressure and carry out steam supply.demand according to steel-making, be 0.9～0.95MPa with the pressure setting that draws gas, steam turbine electro-hydraulic governing system WOODWARD 505E digital governor is exported the PID electrical signal after the steam pipe system pressure signal that detects is calculated judgement, the hydraulic pressure signal that converts the electrical signal to simultaneously medium pressure servo-motor is in time adjusted the pressure of steam outer net by the capable of regulating " rotating barrier " of controlling steam turbine, system can in time follow the tracks of and regulate the vapor pressure that is sent to the steam outer net due to extracted steam from turbine, greatly reduce the pressure wave momentum of steam outer net, stablized the pressure of whole outer net.
(4) two sucking condensing turbines of power plant for self-supply being drawn gas also, vapour externally carries out feed steam jointly, increase because of outer net steam user steam consumption with minimizing suddenly, cause the sudden change of extracted steam from turbine amount that the safe and stable operation of steam turbine is impacted, alleviate the amount of drawing gas acute variation to the impact of the swollen difference of Turbo-generator Set and vibration.Power plant of enterprise as relevant in certain builds up and the sucking condensing type Turbo-generator Set of 3 same model that put into operation simultaneously, the machine stove adopts the piping-main scheme operation, the control system configuration of steam turbine is identical, make the adjustment of the control that steam turbine rotary spacing plate draws gas and the operating pressure that draws gas can be consistent with each other, in running, drawing gas simultaneously of at least two steam turbine dropped into and incorporate the low pressure steam pipe network into, when the steam user use amount of outer net increases suddenly, the steam bleeding system of two steam turbine is adjusted simultaneously, has stablized vapor pressure on the basis of improving the steam supportability.
Outstanding feature of the present invention is: the regulative mode that reclaims by vapour source point method of supplying and afterheat steam to steam pipe system improves, crucial supplementary equipment to Turbo-generator Set is transformed, improve the Stability and adaptability of vapour source device, finally reaching has than the user of great fluctuation process in steam pipe system and reclaims when in the user, a large amount of fluctuation being arranged, still can guarantee the stable of enterprise's steam pipe system pressure, increase simultaneously amount of steam withdrawn, improve the efficient of comprehensive utilization of energy.
Claims (3)
1. the adjusting method of a pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises, it is characterized in that: it adopts following steps:
(1) control mode that is arranged on the steam regulation valve that is incorporated into the power networks after thermal accumulator is Flow-rate adjustment after valve, is limited to 30～35t/h on the flow of setting;
(2) when steam turbine operation, the High Temperature High Pressure initial steam of boiler is introduced surge tank by manually operated valve, to send the shaft seal stripping temperature to be controlled to be 265～280 ℃, Main Steam Temperature Control to 540～532 ℃, shaft seal steam pressure bring up to 0.08～0.085MPa, unit degree of vacuum and be-86～-88KPa;
(3) adopting sucking condensing turbine capable of regulating " rotating barrier " to draw gas to substitute reducing-and-cooling plant to produce steam pipe system to outer low pressure and carry out steam supply, according to the demand of steel-making, is 0.9～0.95MPa with the pressure setting that draws gas.
2. the adjusting method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises according to claim 1, it is characterized in that: it also comprises the steps:
(1) steam turbine electro-hydraulic governing system is exported the PID electrical signal after the steam pipe system pressure signal that detects is calculated judgement, converts the electrical signal to simultaneously the hydraulic pressure signal of medium pressure servo-motor;
(2) control with this hydraulic pressure signal the pressure that steam turbine " rotating barrier " is adjusted the steam outer net.
3. the adjusting method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises according to claim 2, it is characterized in that: adopt at least two extracted steam from turbines and vapour jointly externally to carry out feed steam, when the steam user use amount of outer net increased suddenly, two extracted steam from turbine systems adjusted simultaneously.
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| CN 201010112870 CN101806395B (en) | 2010-02-24 | 2010-02-24 | Regulating method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises |
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| CN 201010112870 CN101806395B (en) | 2010-02-24 | 2010-02-24 | Regulating method of pressure stabilization of public steam pipe network for low-pressure production of iron and steel enterprises |
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| CN101806395B true CN101806395B (en) | 2013-05-08 |
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| CN103790657A (en) * | 2012-10-31 | 2014-05-14 | 贵阳铝镁设计研究院有限公司 | Steam distributing method and device for waste heat generating system of charcoal ink factory |
| CN105757457A (en) * | 2016-03-30 | 2016-07-13 | 本钢板材股份有限公司 | Steel cold-rolling steam supply system |
| CN108534128A (en) * | 2018-04-24 | 2018-09-14 | 邯郸钢铁集团有限责任公司 | A kind of parameter regulation means of two kinds of vapour systems of iron and steel enterprise supply and recycling |
| CN114429870B (en) * | 2022-02-24 | 2023-03-24 | 江苏振华新云电子有限公司 | Steam flow stable output adjusting device for chip tantalum electrolytic capacitor |
Citations (3)
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| CN2560883Y (en) * | 2002-06-27 | 2003-07-16 | 北京中投洁天节能环保科技有限公司 | Water-strike buffering device for condensed water tube net |
| CN2780998Y (en) * | 2005-03-11 | 2006-05-17 | 王汝武 | Novel steam extraction type steam turbine |
| CN101104878A (en) * | 2007-08-09 | 2008-01-16 | 首钢总公司 | Device for mixing saturated steam and superheated steam used for vacuum refining furnace |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2560883Y (en) * | 2002-06-27 | 2003-07-16 | 北京中投洁天节能环保科技有限公司 | Water-strike buffering device for condensed water tube net |
| CN2780998Y (en) * | 2005-03-11 | 2006-05-17 | 王汝武 | Novel steam extraction type steam turbine |
| CN101104878A (en) * | 2007-08-09 | 2008-01-16 | 首钢总公司 | Device for mixing saturated steam and superheated steam used for vacuum refining furnace |
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