CN101761393A - Fuel gas and steam combined circulating system with gas compressor being driven by steam turbine - Google Patents

Fuel gas and steam combined circulating system with gas compressor being driven by steam turbine Download PDF

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Publication number
CN101761393A
CN101761393A CN201010111837A CN201010111837A CN101761393A CN 101761393 A CN101761393 A CN 101761393A CN 201010111837 A CN201010111837 A CN 201010111837A CN 201010111837 A CN201010111837 A CN 201010111837A CN 101761393 A CN101761393 A CN 101761393A
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CN
China
Prior art keywords
turbine
gas compressor
pressure
compressor
steam
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CN201010111837A
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Chinese (zh)
Inventor
刘万才
张辉
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North China Electric Power University
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North China Electric Power University
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Priority to CN201010111837A priority Critical patent/CN101761393A/en
Publication of CN101761393A publication Critical patent/CN101761393A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

Abstract

The invention discloses a fuel gas and steam combined circulating equipment scope used for a turbo-generator and particularly relates to a fuel gas and steam combined circulating system with a gas compressor being driven by a steam turbine. The system of the invention comprises the steam turbine, the gas compressor, a combustion chamber, a turbine, a load, a waste heat boiler, a condenser and a feed pump. The invention includes three combined proposals, namely, a variable working condition system, a system in which the gas compressor is divided into a high pressure gas compressor and a low pressure gas compressor, and a system in which the gas compressor and the turbine are respectively divided into a high pressure structure and a low pressure structure. The biggest difference of the invention from the conventional combined circulating system lies in that the concept that the steam turbine drives the gas compressor to compress gas to apply work is introduced. In the invention, the gas compressor is separated from a combustion engine turbine behind the gas compressor; the state of the gas compressor and the working condition of the turbine are relatively independent; the gas compressor is operated under variable rotation speed and IGV regulation; therefore, when the air flow of the gas compressor is reduced under variable working condition, the surge can be avoided, and the efficiency of the system is improved.

Description

The combustion and steam combined cycle system of Steam Turbine Driven gas compressor
Technical field
The invention belongs to steam turbine generator combustion and steam combined cycle equipment scope, particularly a kind of combustion and steam combined cycle system of Steam Turbine Driven gas compressor.
Background technique
Gas turbine is described as the jewel on the mechanical industry imperial crown as type the most advanced in the thermodynamic device.Particularly the large-scale gas turbine combined cycle system is big with its single-machine capacity, the power supply efficiency height, and characteristics such as the construction period is short, and discharge amount of pollution is little enjoy favor.And integrated gasification combined cycle plants (IGCC) technology is considered to the most promising clean coal power generation technology at present especially.In order to bear system peak load, ensure the safe operation of electrical network, improve serious environmental problem day by day, China has set up a large amount of gas turbines and combustion gas-steam combined cycle.Aspect the coal-fired old power station of transformation, gas turbine is being brought into play enormous function equally, with power and the efficient that improves old power station, and its disposal of pollutants problem is improved.
At present, the merit that modern combustion gas combustion machine turbine is exported probably has 1/2~2/3 to offer the gas compressor acting, to improve the power and the efficient of unit operation.But the variation of the power that the load that gas turbine drives is required and the variation of atmospheric parameter will make gas turbine off-design operating mode, and move under the variable working condition condition, at this moment will cause the variation of series of parameters such as the efficient of unit and rotating speed.Even more serious is, after the flow that flows to gas compressor reduces to some numerical value, causes surge during variable working condition, and unit can not normally be moved, even causes unit that serious breaking-up accident takes place.
Summary of the invention
The combustion and steam combined cycle system that the purpose of this invention is to provide a kind of Steam Turbine Driven gas compressor, it is characterized in that the combustion and steam combined cycle system of described Steam Turbine Driven gas compressor comprises that steam turbine, gas compressor, firing chamber, turbine, load, exhaust heat boiler, vapour condenser and feed water pump constitute with three kinds of assembled schemes;
Scheme 1 is the variable parameter operation system, the variable parameter operation system is connected to firing chamber 3 inlets after being contacted by steam turbine 1 and gas compressor 2, turbine 4 connects load 5, exhaust heat boiler 6 and firing chamber 3 outlets respectively, the inlet of vapour condenser 7 connects steam turbine 1, vapour condenser 7 outlets are connected by feed water pump 8 and exhaust heat boiler 6, and the output tieback of exhaust heat boiler 6 is to steam turbine 1 inlet opening; The running of this variable parameter operation system adopts fixed pressure operation or sliding pressure operation, cooperatively interacts, and coordinates control, makes unit reduce to low-load and regulates, and regulate gas turbine and steam turbine simultaneously, control steam flow when reducing fuel quantity.
Described employing sliding pressure operation is to keep the efficient of exhaust heat boiler under the variable working condition, realize the adjusting of turbine speed and power, when regulating steam turbine, regulate gas compressor simultaneously, reduce the aperture of IGV (inlet guide vane), reduce air quantity, can reduce output power like this and t3 is remained unchanged, make gas turbine have higher combustion machine off-design efficiency.
Scheme 2 is divided into the system of high and low pressure gas compressor for gas compressor, different with scheme 1 structure is that gas compressor 2 is split up into low pressure compressor 21 and high-pressure compressor 22, contact then, low pressure compressor 21 is driven by steam turbine 1, high-pressure compressor 22 is connected with turbine 4, is still driven by turbine 4, and this has not only inherited the advantage of scheme 1, gas compressor flow coefficient at different levels before and after also will helping reasonably selecting helps anti-asthma; Described high-pressure compressor is connected with turbine, initial start stage need not drive whole compressor system, just can move, and has reduced the power plant investment and the demand for fuel of initial start stage, the hypervelocity of turbine helped the stable operation of unit when high-pressure compressor can limit the variable working condition load shedding again simultaneously.
Scheme 3 is the system that gas compressor and turbine are high pressure, low pressure separate structure, and wherein gas compressor 2 is split up into low pressure compressor 21 and high-pressure compressor 22, and turbine is split up into high-pressure turbine 41 and low-pressure turbine 42, then four polyphones; Low pressure compressor 21 is driven by steam turbine 1, high-pressure compressor 22 is driven by high-pressure turbine 41, low-pressure turbine 42 is connected with load 5, exhaust heat boiler 6 respectively, compare with scheme 2, increased power turbine, what the rotational speed regulation of high-pressure compressor 22 was not loaded like this directly influences, behind the gearbox of device, gas compressor flow coefficient at different levels before and after the variable-speed operation of high and low pressure gas compressor helps reasonably selecting is avoided the generation of surge.
The invention has the beneficial effects as follows to have proposed 3 kinds of novel combined cycle arrangements that its difference with the combined cycle system maximum of routine is to introduce the notion of Steam Turbine Driven gas compressor compressed air to do work.Gas compressor is separated with thereafter turbine, the gas compressor state will be relatively independent with the operating mode of turbine, gas compressor operation under variable speed and the adjusting of IGV (inlet guide vane) varied angle, when making gas compressor under variable working condition, reduce air mass flow, avoid the generation of surge, simultaneously can guarantee that the compression ratio of gas compressor maintains higher level, like this, unit is moved under lower load, can keep combustion gas initial temperature before the combustion gas turbine invariable or reduce less, the operation purpose that the steam power that produces by exhaust heat boiler just can the drive pressure mechanism of qi.
Description of drawings
Fig. 1 is that the variable parameter operation system of scheme 1 forms schematic representation.
Fig. 2 is divided into the system schematic of high and low pressure gas compressor for scheme 2 gas compressors.
Fig. 3 is the system schematic of separate structure for scheme 3 gas compressors and turbine
Embodiment
The invention provides a kind of combustion and steam combined cycle system of Steam Turbine Driven gas compressor, comprise that steam turbine, gas compressor, firing chamber, turbine, load, exhaust heat boiler, vapour condenser and feed water pump constitute with three kinds of assembled schemes; Further specified below in conjunction with accompanying drawing.
Figure 1 shows that the variable parameter operation system of scheme 1, be connected to firing chamber 3 inlets behind steam turbine 1 and gas compressor 2 polyphones among the figure, turbine 4 connects load 5, exhaust heat boiler 6 and firing chamber 3 outlets respectively, the inlet of vapour condenser 7 connects steam turbine 1, vapour condenser 7 outlets are connected by feed water pump 8 and exhaust heat boiler 6, and the output tieback of exhaust heat boiler 6 is to steam turbine 1 inlet opening; The adjusting that the running of this variable parameter operation system adopts fixed pressure operation or sliding pressure operation, particularly unit to reduce to low-load is one of characteristic of this programme.Can regulate gas turbine and steam turbine simultaneously, cooperatively interact, coordinate control.When reducing fuel quantity, can control steam flow, this process can be fixed pressure operation or sliding pressure operation certainly, adopts sliding pressure operation to keep the efficient of exhaust heat boiler under the variable working condition, realizes the adjusting of turbine speed and power.When regulating steam turbine, should regulate gas compressor simultaneously, reduce the aperture of IGV, reduce air quantity, can reduce output power like this and t3 is remained unchanged, make gas turbine have higher combustion machine off-design efficiency.But should prevent because pressure ratio reduces, bring the combustion gas release heat energy that can not fully expand, cause turbine afterbody fuel gas temperature too high.As adopt the exhaust heat boiler afterburning, and increase the output work of steam turbine, the pressure ratio of air is improved, can reach higher cycle efficiency when increasing load.Certainly coordinate between the control at each parts, the hypervelocity of turbine during as load shedding, the stability of unit will be difficult problems that needs to be resolved hurrily.
Figure 2 shows that the gas compressor of scheme 2 is divided into the system of high and low pressure gas compressor, different with scheme 1 structure is that gas compressor 2 is split up into low pressure compressor 21 and high-pressure compressor 22, contact then, low pressure compressor 21 is driven by steam turbine 1, high-pressure compressor 22 is connected with turbine 4, is still driven by turbine 4, and this has not only inherited the advantage of scheme 1, gas compressor flow coefficient at different levels before and after also will helping reasonably selecting helps anti-asthma;
At the beginning of starting, the connection of high-pressure compressor and turbine, initial start stage need not drive whole compressor system, has reduced the power plant investment and the demand for fuel of initial start stage, the hypervelocity of turbine helped the stable operation of unit when high-pressure compressor can limit the variable working condition load shedding again simultaneously.Can find out that therefrom the combined cycle scheme of such layout-Steam Turbine Driven gas compressor is compared with conventional scheme, and many advantages are arranged, and merits attention research.
Figure 3 shows that gas compressor and turbine are the system of high pressure, low pressure separate structure, wherein gas compressor 2 is split up into low pressure compressor 21 and high-pressure compressor 22, and turbine is split up into high-pressure turbine 41 and low-pressure turbine 42, then four polyphones; Low pressure compressor 21 is driven by steam turbine 1, high-pressure compressor 22 is driven by high-pressure turbine 41, low-pressure turbine 42 is connected with load 5, exhaust heat boiler 6 respectively, compare with scheme 2, increased power turbine, what the rotational speed regulation of high-pressure compressor 22 was not loaded like this directly influences, behind the gearbox of device, gas compressor flow coefficient at different levels before and after the variable-speed operation of high and low pressure gas compressor helps reasonably selecting is avoided the generation of surge.Initial start stage has further reduced the power plant investment and the demand for fuel of initial start stage as long as drive high-pressure compressor.

Claims (5)

1. the combustion and steam combined cycle system of a Steam Turbine Driven gas compressor, it is characterized in that the combustion and steam combined cycle system of described Steam Turbine Driven gas compressor comprises that steam turbine, gas compressor, firing chamber, turbine, load, exhaust heat boiler, vapour condenser and feed water pump constitute with three kinds of assembled schemes;
Scheme 1 is the variable parameter operation system, the variable parameter operation system is connected to firing chamber 3 inlets after being contacted by steam turbine 1 and gas compressor 2, turbine 4 connects load 5, exhaust heat boiler 6 and firing chamber 3 outlets respectively, the inlet of vapour condenser 7 connects steam turbine 1, vapour condenser 7 outlets are connected by feed water pump 8 and exhaust heat boiler 6, and the output tieback of exhaust heat boiler 6 is to steam turbine 1 inlet opening; The running of this variable parameter operation system adopts fixed pressure operation or sliding pressure operation, cooperatively interacts, and coordinates control, makes unit reduce to low-load and regulates, and regulate gas turbine and steam turbine simultaneously, control steam flow when reducing fuel quantity;
Scheme 2 is divided into the system of high and low pressure gas compressor for gas compressor, different with scheme 1 structure is that gas compressor 2 is split up into low pressure compressor 21 and high-pressure compressor 22, contact then, low pressure compressor 21 is driven by steam turbine 1, high-pressure compressor 22 is connected with turbine 4, is still driven by turbine 4, and this has not only inherited the advantage of scheme 1, gas compressor flow coefficient at different levels before and after also will helping reasonably selecting helps anti-asthma;
Scheme 3 is the system that gas compressor and turbine are high pressure, low pressure separate structure, and wherein gas compressor 2 is split up into low pressure compressor 21 and high-pressure compressor 22, and turbine is split up into high-pressure turbine 41 and low-pressure turbine 42, then four polyphones; Low pressure compressor 21 is driven by steam turbine 1, high-pressure compressor 22 is connected with high-pressure turbine 41, high-pressure compressor 22 is driven by high-pressure turbine 41, low-pressure turbine 42 is connected with load 5, exhaust heat boiler 6 respectively, compares with scheme 2, has increased power turbine, what the rotational speed regulation of high-pressure compressor 22 was not loaded like this directly influences, behind the gearbox of device, gas compressor flow coefficient at different levels before and after the variable-speed operation of high and low pressure gas compressor helps reasonably selecting is avoided the generation of surge.
2. according to the combustion and steam combined cycle system of the described Steam Turbine Driven gas compressor of claim 1, it is characterized in that, described employing sliding pressure operation is to keep the efficient of exhaust heat boiler under the variable working condition, realize the adjusting of turbine speed and power, when regulating steam turbine, regulate gas compressor simultaneously, reduce the aperture of IGV (inlet guide vane), reduce air quantity, can reduce output power like this and t3 is remained unchanged, make gas turbine have higher combustion machine off-design efficiency.
3. according to the combustion and steam combined cycle system of the described Steam Turbine Driven gas compressor of claim 1, it is characterized in that described gas compressor is divided into the system of high and low pressure gas compressor.
4. according to the combustion and steam combined cycle system of the described Steam Turbine Driven gas compressor of claim 1, it is characterized in that described gas compressor and turbine are the system of high pressure, low pressure separate structure.
5. according to the combustion and steam combined cycle system of the described Steam Turbine Driven gas compressor of claim 1, it is characterized in that, described high-pressure compressor is connected with high-pressure turbine, make initial start stage need not drive whole compressor system, just can move, reduced the power plant investment and the demand for fuel of initial start stage, the hypervelocity of turbine helped the stable operation of unit when high-pressure compressor can limit the variable working condition load shedding again simultaneously.
CN201010111837A 2010-02-11 2010-02-11 Fuel gas and steam combined circulating system with gas compressor being driven by steam turbine Pending CN101761393A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103748323A (en) * 2011-06-28 2014-04-23 布莱特能源存储科技有限责任公司 Semi-isothermal compression engines with separate combustors and expanders, and associated system and methods
CN104534539A (en) * 2015-01-08 2015-04-22 清华大学 Gas steam combined cycle central heating device and heating method
CN105204372A (en) * 2015-09-14 2015-12-30 国网福建省电力有限公司 Gas-steam combined circulation unit speed-regulating system model and model establishment method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6003298A (en) * 1997-10-22 1999-12-21 General Electric Company Steam driven variable speed booster compressor for gas turbine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6003298A (en) * 1997-10-22 1999-12-21 General Electric Company Steam driven variable speed booster compressor for gas turbine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103748323A (en) * 2011-06-28 2014-04-23 布莱特能源存储科技有限责任公司 Semi-isothermal compression engines with separate combustors and expanders, and associated system and methods
CN104534539A (en) * 2015-01-08 2015-04-22 清华大学 Gas steam combined cycle central heating device and heating method
CN105204372A (en) * 2015-09-14 2015-12-30 国网福建省电力有限公司 Gas-steam combined circulation unit speed-regulating system model and model establishment method thereof
CN105204372B (en) * 2015-09-14 2018-02-09 国网福建省电力有限公司 A kind of Combined cycle gas-steam turbine set speed adjustment system model and its modeling method

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