CN1598250A - Method for controlling and device heat electricity linked production of condensing steam turbine with three low cylinder and three-exhauster - Google Patents

Method for controlling and device heat electricity linked production of condensing steam turbine with three low cylinder and three-exhauster Download PDF

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Publication number
CN1598250A
CN1598250A CN 200410020392 CN200410020392A CN1598250A CN 1598250 A CN1598250 A CN 1598250A CN 200410020392 CN200410020392 CN 200410020392 CN 200410020392 A CN200410020392 A CN 200410020392A CN 1598250 A CN1598250 A CN 1598250A
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steam
cylinder
pressure
flow
low pressure
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CN100494642C (en
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马克文
于希曾
孙龙彪
刘卫平
张兆新
何熙光
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Tianjin Power Science & Technology Development Corp
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Tianjin Power Science & Technology Development Corp
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]

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Abstract

The invention is a three-low-cylinder and three-gas-discharges condense steam turbine group heat coupler control method and the device. Its control method is: based on guaranteeing the function relation P middle discharge= f (G primary steam) between the pressure and the primary steam flow, through increasing the steam quantity in primary channel or decreasing steam flow in the low pressure cylinder, in order to satisfy the steam quantity needed by the oil extraction heat supplying pipe. The outlet pressure sensor of the middle pressure cylinder is connected to a remote control device; the remote control device controls the flow in branch flow, and adjusts the low pressure steam pipe flow adjusting device. The device includes oil heat supplying branch, on which there arranges with a flow adjusting device; a flow adjusting device is assembled on the low pressure air channel of the middle pressure cylinder and the symmetrical division low pressure cylinder; the pressure signal outputted by the pressure sensor is transmitted to the remote control device, the output end of the remote control device is connected to the flow adjusting devices for oil extraction and heat supplying branch and the low pressure steam guiding pipe.

Description

Three-low cylinder three-exhauster condensing steam turbine group cogeneration of heat and power controlling method and device
Affiliated technical field
The present invention relates to the steam turbine of thermal power plant group, be specifically related to the controlling method and the device of a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration of heat and power.
Background technique
The 200MW steam turbine set of power plants use now has two steam discharges and two kinds of types of three-exhauster condensing steam turbine group.Three-low cylinder three-exhauster condensing steam turbine group can only provide mechanical output to generate electricity to generator, and can not thermotropism user heat supply draw gas.Its reason is: the conjuncted low pressure (LP) cylinder of intermediate pressure cylinder and intermediate pressure cylinder is made as one, so steam that intermediate pressure cylinder is arranged is divided into two strands of steam flows, the one tunnel enters the low pressure (LP) cylinder that joins together with intermediate pressure cylinder, promptly with the conjuncted low pressure (LP) cylinder of intermediate pressure cylinder; Another road enters the structurally symmetrical flow deviding type low pressure (LP) cylinder of symmetric arrangement through the low pressure steam guiding tube.If perforate is drawn gas from the low pressure steam guiding tube, the steam flow that drains into each low pressure (LP) cylinder is reduced, cause the intermediate pressure cylinder exhaust steam pressure to reduce, the pressure drop of cylinder final stage made its excess load during this will increase, and jeopardized safety in operation; On the other hand, because of there not being mean of calculating, can not guarantee the required heat supply pressure of heating power user.Therefore China's three-low cylinder three-exhauster 200MW unit can not transform cogeneration units as, and this point is generally acknowledged by manufacturing firm.
Summary of the invention
Purpose of the present invention just provides a kind of new controlling method and device, solves the problem of above-mentioned existence, reaches the purpose that realizes cogeneration of heat and power at three-low cylinder three-exhauster 200MW unit.
Technical solution of the present invention is achieved in that a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration of heat and power controlling method, move the mode that is converted to cogeneration of heat and power by the pure condensate mode and move, its controlling method is: at the function relation P that guarantees that the intermediate pressure cylinder exhaust steam pressure becomes with main steam flow amount Middle row=f (G Main vapour) the intermediate pressure cylinder exhaust steam pressure is met under the prerequisite of safe operation design load, by reducing symmetrical flow deviding type low pressure (LP) cylinder steam admission flow and/or increasing main steam intake line steam flow, to satisfy the required heating steam amount of extraction for heat supply arm.Its output of intermediate pressure cylinder outlet pressure sensor is connected to program control device; By program control device extraction for heat supply tube branching flow regulating device, low pressure steam guiding tube flow regulator and main steam flow controlling device are carried out the Continuous Tracking regulation and control.
Realize the device of above-mentioned a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration of heat and power controlling method, comprise intermediate pressure cylinder, low pressure steam guiding tube, symmetrical flow deviding type low pressure (LP) cylinder; External extraction for heat supply arm on the low pressure steam guiding tube, and on this extraction for heat supply arm, flow regulator is installed, the other end of this extraction for heat supply arm is connected with heat supply network; On the low pressure steam guiding tube before symmetrical flow deviding type low pressure (LP) cylinder flow regulator is installed also; The intermediate pressure cylinder outlet is provided with pressure transducer, and the pressure signal of its output is delivered to program control device, and the control signal of program control device output is connected to the flow regulator of extraction for heat supply arm and low pressure steam guiding tube respectively.
Described flow regulator is electric liquid modulating valve or electric control valve.
After the invention process, this N200-12.75/535/535 three-low cylinder three-exhauster 200MW unit is transformed into " two-purpose " cogeneration units according to the present invention after, when not needing heat supply, can the pure condensate way of steam generating, still keep the technical-economic index of former designs such as original generated output, heat consumption rate; And when the needs heat supply, can change the cogeneration of heat and power mode again immediately over to move, heat capacity is equivalent to the boiler room of a 135MW ultrahigh pressure cogeneration units or 260t/h scale, therefore has the energy utilization rate height; Improve advantages such as performance driving economy.
Description of drawings
Below in conjunction with drawings and Examples to the detailed description of the invention.
Fig. 1 is a structural representation of the present invention;
The 1-high-pressure cylinder, 2-intermediate pressure cylinder, the conjuncted low pressure (LP) cylinder of 3-and intermediate pressure cylinder, 4-symmetry flow deviding type low pressure (LP) cylinder, the 5-pressure transducer, 6-vapour condenser, 7-low pressure steam guiding tube, 8-extraction for heat supply arm, 9-low pressure steam guiding tube modulating valve, 10-heat supply arm modulating valve, 11-program control device, 12-main steam intake line controlling device, the 13-reheater
Specific embodiments
Embodiment 1
Present embodiment is selected N200-12.75/535/535 three-low cylinder three-exhauster condensed steam type 200MW unit for use, because the function relation that the intermediate pressure cylinder exhaust steam pressure becomes with main steam flow amount, i.e. P have been determined in the strictness of unit design sheets Middle row=f (G Main vapour).After adopting the present invention, keeping under the constant prerequisite of this function relation, electricity determining by heat, the steam diversion of will partly generating electricity is used to heat supply, so both can keep P again for heat supply provides steam flow Middle row=f (G Main vapour) function relation is constant, guarantees the intermediate pressure cylinder safe operation.
Realize the device (as shown in Figure 1) of above-mentioned a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration of heat and power controlling method, comprise high-pressure cylinder 1, intermediate pressure cylinder 2, the reheater 13 that connects high-pressure cylinder 1 and intermediate pressure cylinder 2, low pressure steam guiding tube 7, with the conjuncted low pressure (LP) cylinder 3 of intermediate pressure cylinder, symmetrical flow deviding type low pressure (LP) cylinder 4, intermediate pressure cylinder outlet pressure sensor 5; External extraction for heat supply arm 8 on low pressure steam guiding tube 7, and modulating valve 10 is installed on this extraction for heat supply arm 8, the other end of this extraction for heat supply arm 8 is connected with heat supply network; On the low pressure steam guiding tube 7 of symmetrical flow deviding type low pressure (LP) cylinder 4 fronts, modulating valve 9 is installed also; Pressure transducer 5 is installed in the outlet of intermediate pressure cylinder 2, and its output is connected with program control device 11; The control electrical signal of program control device 11 outputs is connected with heat supply arm modulating valve 10 and main steam intake line controlling device 12 with low pressure steam guiding tube modulating valve 9 respectively.The control procedure of its cogeneration of heat and power operation is: obtaining intermediate pressure cylinder outlet exhaust steam pressure by pressure transducer 5 (is P Middle row) signal, be that electrical signal is delivered to program control device 11 with this signal conversion, compare with safe operation setting value in the program control device 11 that assignment of traffic software is installed; According to the needs of steam turbine heat, electric load operating mode and job security, follow the tracks of adjustment by 11 pairs of low pressure steam guiding tubes of program control device modulating valve 9, heat supply arm modulating valve 10.Guaranteeing that the intermediate pressure cylinder exhaust steam pressure meets in the safe operation upper and lower scope of design code, by reducing symmetrical flow deviding type low pressure (LP) cylinder 4 throttle flows and/or increase main steam intake line steam flow, satisfying the required heating steam amount of extraction for heat supply arm 8.The program control device 11 of present embodiment is a function of using Distributed Control System (DCS), uses the Logical Configuration software systems.
Below in conjunction with Fig. 1 cogeneration of heat and power controlling method of the present invention is described:
When being converted to cogeneration of heat and power, its control procedure is as follows:
1, opens heat supply arm modulating valve 10 steam supplies by program control device 11, make extraction for heat supply arm steam flow satisfy the heat supply user requirement, at this moment P Middle rowMust descend.
2, pressure transducer 5 is with P Middle rowDrop-out value is converted to electrical signal and is delivered to program control device 11, converses the control electrical signal by assignment of traffic software, at first makes low pressure steam guiding tube modulating valve 9 turn down throttling, according to the P of producer's requirement Middle row=f (G Main vapour) concern the generating steam flow that is reduced to symmetrical flow deviding type low pressure (LP) cylinder 4, make P Middle rowBe not less than intermediate pressure cylinder 2 exhaust steam pressure design loads under pure condensate vapour operating mode; Owing to the double influence of 9 throttlings of low pressure steam guiding tube modulating valve and extraction for heat supply, symmetrical flow deviding type low pressure (LP) cylinder 4 initial steam pressures must be lower than initial steam pressure under the pure condensate operating mode simultaneously, and safety condition is met.
3, if intermediate pressure cylinder exhaust steam pressure P Middle rowGreater than the needed heat supply pressure of heat supply user, then turn down heat supply arm modulating valve 10, make heat supply pressure equal the required pressure of heat supply user by 10 throttlings of heat supply arm modulating valve, drive big low pressure steam guiding tube modulating valve 9 simultaneously, make P Middle row=f (G Main vapour) function relation is constant.
4, if intermediate pressure cylinder exhaust steam pressure P Middle rowLess than the required pressure of heat supply user, then program control device 11 control main steam intake line controlling devices 12 increase main steam flow amount G Main vapour, till satisfying the required heat supply pressure of heat supply user.
Above-mentioned self-regulating process is that Continuous Tracking is steadily regulated, electricity determining by heat.If dispatching of power netwoks requires to change generator power or the heating power user changes parameter, program control device 11 can be regulated by automatic held stationary, make all operations of the designated value between given upper and lower of generator power, heat supply flow and heat supply pressure, and guarantee to satisfy the relevant parameter designing regulation of unit safety economy.

Claims (4)

1, a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration of heat and power controlling method is characterized in that: at the function relation P that guarantees that the intermediate pressure cylinder exhaust steam pressure becomes with main steam flow amount Middle row=f (G Main vapour) the intermediate pressure cylinder exhaust steam pressure is met under the prerequisite of safe operation design load, by reducing symmetrical flow deviding type low pressure (LP) cylinder steam admission flow and/or increasing main steam intake line steam flow, to satisfy the required heating steam amount of extraction for heat supply arm.
2, a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration of heat and power controlling method according to claim 1, it is characterized in that: described its output of intermediate pressure cylinder outlet pressure sensor is connected to program control device; By program control device extraction for heat supply tube branching flow regulating device, low pressure steam guiding tube flow regulator and main steam flow controlling device are carried out the Continuous Tracking regulation and control.
3, a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration system, it is characterized in that: external extraction for heat supply arm on the low pressure steam guiding tube, and on this extraction for heat supply arm, flow regulator is installed, the other end of this extraction for heat supply arm is connected with heat supply network; On the low pressure steam guiding tube before symmetrical flow deviding type low pressure (LP) cylinder flow regulator is installed also; The intermediate pressure cylinder outlet is provided with pressure transducer, and the pressure signal of its output is delivered to program control device, and the control signal of program control device output is connected to the flow regulator of extraction for heat supply arm and low pressure steam guiding tube respectively.
4, a kind of three-low cylinder three-exhauster condensing steam turbine group cogeneration system according to claim 3, it is characterized in that: described flow regulator is electric liquid modulating valve or electric control valve.
CN 200410020392 2004-08-31 2004-08-31 Method and device for controlling heat electricity linked production of condensing steam turbine with three low cylinder and three-exhauster Expired - Fee Related CN100494642C (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102392693A (en) * 2011-11-28 2012-03-28 北京北重汽轮电机有限责任公司 Heating cogeneration turbogenerator system
CN101672203B (en) * 2009-10-15 2012-05-30 华北电力大学 Adjusting method for heating steam of cogeneration system
CN102510932A (en) * 2009-09-23 2012-06-20 西门子公司 Steam power plant
CN101798941B (en) * 2010-01-08 2013-05-01 华北电力大学 Optimal cold source heating network heater and determination method for parameter thereof
CN103382860A (en) * 2013-05-24 2013-11-06 华电国际电力股份有限公司山东分公司 Control method for steam turbine power generation and heat supply system
CN103403303A (en) * 2010-12-08 2013-11-20 西门子公司 Retrofitting a heating steam extraction facility in a fossil-fired power plant
CN103628937A (en) * 2013-11-29 2014-03-12 东方电气集团东方汽轮机有限公司 Method for better utilizing waste gas of turboset
CN103670547A (en) * 2013-12-11 2014-03-26 东方电气集团东方汽轮机有限公司 Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset
CN105189941A (en) * 2013-03-22 2015-12-23 三菱重工业株式会社 Steam turbine plant
CN106523049A (en) * 2015-09-11 2017-03-22 上海上电漕泾发电有限公司 Turbine steam extraction and heat supply system
CN107905858A (en) * 2017-11-17 2018-04-13 中国大唐集团科学技术研究院有限公司火力发电技术研究所 Final stage safe traffic Monitoring and control system and method

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102510932A (en) * 2009-09-23 2012-06-20 西门子公司 Steam power plant
CN101672203B (en) * 2009-10-15 2012-05-30 华北电力大学 Adjusting method for heating steam of cogeneration system
CN101798941B (en) * 2010-01-08 2013-05-01 华北电力大学 Optimal cold source heating network heater and determination method for parameter thereof
CN103403303A (en) * 2010-12-08 2013-11-20 西门子公司 Retrofitting a heating steam extraction facility in a fossil-fired power plant
CN102392693A (en) * 2011-11-28 2012-03-28 北京北重汽轮电机有限责任公司 Heating cogeneration turbogenerator system
CN105189941A (en) * 2013-03-22 2015-12-23 三菱重工业株式会社 Steam turbine plant
US9726048B2 (en) 2013-03-22 2017-08-08 Mitsubishi Heavy Industries, Ltd. Steam turbine plant
CN103382860A (en) * 2013-05-24 2013-11-06 华电国际电力股份有限公司山东分公司 Control method for steam turbine power generation and heat supply system
CN103382860B (en) * 2013-05-24 2015-12-02 华电国际电力股份有限公司山东分公司 Steam turbine power generation heating system controlling method
CN103628937B (en) * 2013-11-29 2015-06-24 东方电气集团东方汽轮机有限公司 Method for better utilizing waste gas of turboset
CN103628937A (en) * 2013-11-29 2014-03-12 东方电气集团东方汽轮机有限公司 Method for better utilizing waste gas of turboset
CN103670547A (en) * 2013-12-11 2014-03-26 东方电气集团东方汽轮机有限公司 Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset
CN106523049A (en) * 2015-09-11 2017-03-22 上海上电漕泾发电有限公司 Turbine steam extraction and heat supply system
CN106523049B (en) * 2015-09-11 2018-03-16 上海上电漕泾发电有限公司 A kind of extracted steam from turbine heating system
CN107905858A (en) * 2017-11-17 2018-04-13 中国大唐集团科学技术研究院有限公司火力发电技术研究所 Final stage safe traffic Monitoring and control system and method
CN107905858B (en) * 2017-11-17 2023-06-30 中国大唐集团科学技术研究院有限公司火力发电技术研究所 Final stage safety flow monitoring and controlling system and method

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