CN104763537A - Method and device for main steam temperature control at combined cycle unit starting stage - Google Patents
Method and device for main steam temperature control at combined cycle unit starting stage Download PDFInfo
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- CN104763537A CN104763537A CN201510094427.7A CN201510094427A CN104763537A CN 104763537 A CN104763537 A CN 104763537A CN 201510094427 A CN201510094427 A CN 201510094427A CN 104763537 A CN104763537 A CN 104763537A
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Abstract
The invention discloses a method and device for main steam temperature control at a combined cycle unit starting stage. The combustion temperature of a gas turbine can be regarded as a function of gas turbine exhaust gas temperature and compressor pressure ratio, therefore the gas turbine compressor pressure ratio and the exhaust gas temperatures of a plurality of gas turbines are firstly measured, according to the exhaust gas temperatures of the plurality of gas turbines, a relatively accurate value can be obtained as the exhaust gas temperature, a starting stage gas turbine temperature control line is looked up according to the compressor pressure ratio of the gas turbine to obtain an exhaust gas temperature limit value, and then the accurate exhaust gas temperature is compared with the exhaust gas temperature limit value to obtain a difference value of the two, the combustion temperature of the gas turbine is controlled through an existing control system according to the difference value, the exhaust gas temperature of the gas turbine is controlled directly so as to reach the purpose of controlling the unit main steam temperature not beyond the limit.
Description
Technical field
The application relates to combined cycle generation field, more particularly, relates to controlling method and the device of main steam temperature start up period of a kind of Combined Cycle Unit.
Background technique
Integrated gas-steam combined cycle power plant technology is gradually ripe, and the further exploitation of natural gas resource in world wide, gas turbine and combined cycle generation thereof the status in electric power system is improved gradually.The installation that gas turbine possesses is fast, take up an area less, start and stop are rapid, safe and reliable, also enjoy favor by series of advantages such as water are few.Can predict, along with the adjustment of China's energy resource structure, environmental requirement increasingly stringent, combined cycle is as the generation technology of a kind of advanced person, and the status in China's electrical production industry is also improved day by day.
GE company produce 9F combustion gas-Steam Combined Cycle unit start up period specific load region, the easy overheating problem of ubiquity main steam, for certain gas turbine unit, gas turbine is at 80 ~ 160MW load area, combustion engine temperature of exhaust fume has reached 649.9 DEG C, because IGV temperature control gets involved, the unlatching of adjustable guide vane makes the high-temperature flue gas flow entering exhaust heat boiler increase considerably, and the steam flow that now exhaust heat boiler high pressure evaporator produces does not mate with flue gas flow, exhaust heat boiler considers that when designing operating mode is more simultaneously, the examination operating mode that is configured to of heat exchange area and vapor (steam) temperature and cooling water is checked, due to the particularity of gas turbine temperature of exhaust fume, gas turbine temperature of exhaust fume has hump characteristic in whole load alternation process, temperature variation is low-Gao-low, under Part load, consider that deficiency finally causes main steam overtemperature.
Some patents have been had to consider the temperature controlled problem of adjustable guide vane at present, as a kind of gas turbine blower import adjustable guide vane temperature control method that number of patent application is 201310117901.4, gas turbine is installed exhaust gas temperature sensor and import adjustable guide vane angle measurement transmitter, by regulating compressor inlet adjustable guide vane angle, delivery temperature is changed by known rules.But these patents just control for adjustable guide vane, realize the rule change of exhaust, effectively can not control the temperature variation of unit main steam, not consider the matching of exhaust heat boiler and gas turbine, therefore also have some limitations at application.
For multiaxis combustion gas-Steam Combined Cycle unit (S209FA), by the temperature control mode in optimal startup stage, control main steam temperature when Combined Cycle Unit starts, ensure that temperature overtemperature alarm does not occur, gas turbine combustion temperature during sub load reduces, the hot passage parts operating mode of unit is improved before optimizing, its combustion component, hot passage parts life consumption reduces, the temperature of exhaust fume control objectives that gas turbine start-up course is new makes gas turbine RB trip accident reduce, toggle speed is accelerated, accelerate the starting-up response speed of unit simultaneously, decrease discharge, improve the Security of unit operation, while Economy, also social benefit is brought.Therefore, by the temperature control mode in optimal startup stage, to solve the too high problem of unit main steam temperature, there is very strong realistic meaning.
Summary of the invention
In view of this, the start up period that the application providing a kind of Combined Cycle Unit, the controlling method of main steam temperature and device, by the temperature control mode in optimal startup stage, control the temperature of exhaust fume of gas turbine, reach the object controlling unit main steam temperature and do not transfinite.
To achieve these goals, the existing scheme proposed is as follows:
The controlling method of main steam temperature start up period of a kind of Combined Cycle Unit:
Obtain inner side multiple temperature of exhaust fume circumferentially of the compressor pressure ratio of gas turbine and the smoke evacuation Diffuser of gas turbine;
Calculate the average temperature of exhaust fume of described multiple temperature of exhaust fume;
The start up period of looking into according to the compressor pressure ratio of gas turbine, gas turbine temperature control line, obtains temperature of exhaust fume limit value;
More described average temperature of exhaust fume and described temperature of exhaust fume limit value, obtain the temperature difference of the two;
The combustion temperature of gas turbine start up period of control according to described temperature difference adjustment, and then the temperature of exhaust fume of adjustment gas turbine, reach the object controlling unit main steam temperature and do not transfinite.
Preferably, after multiple temperature of exhaust fume of described acquisition gas turbine, also comprise:
Determine the highest temperature of exhaust fume in multiple temperature of exhaust fume and minimum temperature of exhaust fume;
The highest described temperature of exhaust fume and described minimum temperature of exhaust fume are rejected.
Preferably, multiple temperature of exhaust fume of described acquisition gas turbine, comprising:
In the inner side of the smoke evacuation Diffuser of gas turbine, multiple thermocouple is circumferentially installed, obtains multiple temperature of exhaust fume.
A control gear for main steam temperature the start up period of Combined Cycle Unit, comprising:
Collecting unit, for inner side multiple temperature of exhaust fume circumferentially of the smoke evacuation Diffuser of the compressor pressure ratio and gas turbine that obtain gas turbine;
Computing unit, for calculating the average temperature of exhaust fume of described multiple temperature of exhaust fume;
Search unit, the start up period of for looking into according to the compressor pressure ratio of gas turbine, gas turbine temperature control line, obtains temperature of exhaust fume limit value
Comparing unit, for more described average temperature of exhaust fume and described temperature of exhaust fume limit value, obtains the temperature difference of the two;
Control unit, the combustion temperature of gas turbine start up period of for controlling according to described temperature difference adjustment, and then the temperature of exhaust fume of adjustment gas turbine, reach the object controlling unit main steam temperature and do not transfinite.
Through as shown from the above technical solution, the application discloses a kind of gas turbine combustion temperature control method and device.The combustion temperature of gas turbine can regard a function of gas turbine temperature of exhaust fume and press machine pressure ratio as, thus first the present invention measures and obtains the compressor pressure ratio of gas turbine and the temperature of exhaust fume of multiple gas turbine, and then obtain a relatively real value as temperature of exhaust fume according to the temperature of exhaust fume of above-mentioned multiple gas turbine, this temperature of exhaust fume of comparison and the temperature of exhaust fume limit value that the start up period of being looked into by the compressor pressure ratio of gas turbine, gas turbine temperature control line obtains, obtain the difference between them, indirectly controlled the temperature of exhaust fume of gas turbine by the combustion temperature of existing control system control gas turbine by difference, reach the object controlling unit main steam temperature and do not transfinite.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The schematic flow sheet of an embodiment of the method for Main Steam Temperature Control start up period that Fig. 1 showing a kind of Combined Cycle Unit of the present invention;
Fig. 2 shows the distribution map of combustion engine temperature of exhaust fume thermocouple of the present invention;
Gas turbine temperature control line schematic diagram start up period that Fig. 3 showing of the present invention;
Fig. 4 shows temperature control logic schematic diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The schematic flow sheet of an embodiment of the method for Main Steam Temperature Control start up period of showing a kind of Combined Cycle Unit of the present invention see Fig. 1.
101: the inner side multiple temperature of exhaust fume circumferentially obtaining the compressor pressure ratio of gas turbine and the smoke evacuation Diffuser of gas turbine.
In the inner side of smoke evacuation Diffuser, some Zhi Ge-aluminium sheathed thermocouple is circumferentially installed, these thermocouples are used for measuring temperature of exhaust fume, all these temperature are delivered in SPEEDTRONIC MARK VI control panel by cable, by terminal block, I/O module, finally enter <R><SGreatT.Grea T.GT<T> controller respectively.
The distribution map of combustion engine temperature of exhaust fume thermocouple of the present invention is shown see Fig. 2.The distribution of combustion engine temperature of exhaust fume thermocouple is as follows: TT-XD-1, TT-XD-4, TT-XD-7, TT-XD-10, TT-XD-13, TT-XD-16, TT-XD-19, TT-XD-22, TT-XD-25, TT-XD-28, TT-XD-31 carry out into < R > controller.TT-XD-2, TT-XD-5, TT-XD-8, TT-XD-11, TT-XD-14, TT-XD-17, TT-XD-20, TT-XD-23, TT-XD-26, TT-XD-29 carry out into < S > controller.TT-XD-3, TT-XD-6, TT-XD-9, TT-XD-12, TT-XD-15, TT-XD-18, TT-XD-21, TT-XD-24, TT-XD-27, TT-XD-30 carry out into < R > controller.
102: the average temperature of exhaust fume calculating described multiple temperature of exhaust fume.
The gas turbine temperature of exhaust fume (TT-XD-1 to XD-31) by temperature control logic temperature of exhaust fume being controlled set point and measurement is compared, and by these values from being up to minimum sequence, TT-XD-2 uses in combustion monitor logic and temperature control logic, in combustion monitor and temperature control logic, all smoke evacuation thermocouple inputs are monitored, if when the setting constant in any one reading and controller compares too low, this value will be abandoned.The highest minimum also will be dropped, then be averaging processing its remainder values, and produce a reality, accurately TTXM survey number, for control logic.
103: gas turbine temperature control line start up period of looking into according to the compressor pressure ratio of gas turbine, obtains temperature of exhaust fume limit value.
The combustion temperature of gas turbine is the function of temperature of exhaust fume and compressor pressure ratio (CPD) or temperature of exhaust fume and fuel consumption measurement.Combustion temperature is by the linear function of temperature of exhaust fume and limited by the linear function of smoke evacuation and FSR.Temperature control deviation program is kept in control system computer storage.
104: more described average temperature of exhaust fume and described temperature of exhaust fume limit value, obtain the temperature difference of the two.
105: the combustion temperature of gas turbine start up period of control according to described temperature difference adjustment, and then the temperature of exhaust fume of adjustment gas turbine, reach the object controlling unit main steam temperature and do not transfinite.
Gas turbine temperature control line schematic diagram (abscissa pressure ratio, the y coordinate temperature of exhaust fume) start up period of showing of the present invention see Fig. 3.In IGV temperature controls, original three temperature control lines, on present Control System Software to start up period sub load time temperature control line do to optimize amendment, increase by one new start up period the temperature control line that uses, according to this newly-increased temperature control line realization, the combustion temperature of gas turbine is controlled.
It should be noted that, the invention also discloses the control gear of main steam temperature start up period of a kind of Combined Cycle Unit, show temperature control logic schematic diagram of the present invention see Fig. 4.This device mainly comprises:
Collecting unit, for inner side multiple temperature of exhaust fume circumferentially of the smoke evacuation Diffuser of the compressor pressure ratio and gas turbine that obtain gas turbine;
Computing unit, for calculating the average temperature of exhaust fume of described multiple temperature of exhaust fume;
Search unit, the start up period of for looking into according to the compressor pressure ratio of gas turbine, gas turbine temperature control line, obtains temperature of exhaust fume limit value
Comparing unit, for more described average temperature of exhaust fume and described temperature of exhaust fume limit value, obtains the temperature difference of the two;
Control unit, the combustion temperature of gas turbine start up period of for controlling according to described temperature difference adjustment, and then the temperature of exhaust fume of adjustment gas turbine, reach the object controlling unit main steam temperature and do not transfinite.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or control panel, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. the controlling method of main steam temperature start up period of Combined Cycle Unit, is characterized in that, comprising:
Obtain inner side multiple temperature of exhaust fume circumferentially of the compressor pressure ratio of gas turbine and the smoke evacuation Diffuser of gas turbine;
Calculate the average temperature of exhaust fume of described multiple temperature of exhaust fume;
The start up period of looking into according to the compressor pressure ratio of gas turbine, gas turbine temperature control line, obtains temperature of exhaust fume limit value;
More described average temperature of exhaust fume and described temperature of exhaust fume limit value, obtain the temperature difference of the two;
The combustion temperature of gas turbine start up period of control according to described temperature difference adjustment, and then the temperature of exhaust fume of adjustment gas turbine, reach the object controlling unit main steam temperature and do not transfinite.
2. method according to claim 1, is characterized in that, after multiple temperature of exhaust fume of described acquisition gas turbine, also comprises:
Determine the highest temperature of exhaust fume in multiple temperature of exhaust fume and minimum temperature of exhaust fume;
The highest described temperature of exhaust fume and described minimum temperature of exhaust fume are rejected.
3. method according to claim 1, is characterized in that, multiple temperature of exhaust fume of described acquisition gas turbine, comprising:
In the inner side of the smoke evacuation Diffuser of gas turbine, multiple thermocouple is circumferentially installed, obtains multiple temperature of exhaust fume.
4. the control gear of main steam temperature start up period of Combined Cycle Unit, is characterized in that, comprising:
Collecting unit, for inner side multiple temperature of exhaust fume circumferentially of the smoke evacuation Diffuser of the compressor pressure ratio and gas turbine that obtain gas turbine;
Computing unit, for calculating the average temperature of exhaust fume of described multiple temperature of exhaust fume;
Search unit, the start up period of for looking into according to the compressor pressure ratio of gas turbine, gas turbine temperature control line, obtains temperature of exhaust fume limit value
Comparing unit, for more described average temperature of exhaust fume and described temperature of exhaust fume limit value, obtains the temperature difference of the two;
Control unit, the combustion temperature of gas turbine start up period of for controlling according to described temperature difference adjustment, and then the temperature of exhaust fume of adjustment gas turbine, reach the object controlling unit main steam temperature and do not transfinite.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107035537A (en) * | 2017-04-28 | 2017-08-11 | 申能股份有限公司 | A kind of combined cycle warming-up load dynamic matching method |
| CN107304689A (en) * | 2016-04-22 | 2017-10-31 | 北京澳尔金石油技术开发有限公司 | A kind of gas turbine and its whole Combined Cycle Unit temperature-adjusting device and method |
| CN108518671A (en) * | 2018-04-16 | 2018-09-11 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of waste heat boiler Main Steam Temperature Control device and control method |
| CN109812299A (en) * | 2019-01-17 | 2019-05-28 | 杭州汽轮动力集团有限公司 | A kind of gas turbine turbine rotor cooling means and cooling gas system |
| CN113091047A (en) * | 2021-04-02 | 2021-07-09 | 杭州华电半山发电有限公司 | Control method for main steam desuperheating water of unit |
| CN113982762A (en) * | 2021-10-27 | 2022-01-28 | 华能国际电力股份有限公司 | Early warning method for combustion temperature of gas turbine |
| CN114033555A (en) * | 2021-11-19 | 2022-02-11 | 华能国际电力股份有限公司 | Method for reducing yellow smoke emission time |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107304689A (en) * | 2016-04-22 | 2017-10-31 | 北京澳尔金石油技术开发有限公司 | A kind of gas turbine and its whole Combined Cycle Unit temperature-adjusting device and method |
| CN107035537A (en) * | 2017-04-28 | 2017-08-11 | 申能股份有限公司 | A kind of combined cycle warming-up load dynamic matching method |
| CN107035537B (en) * | 2017-04-28 | 2018-09-25 | 申能股份有限公司 | A kind of combined cycle warming-up load dynamic matching method |
| CN108518671A (en) * | 2018-04-16 | 2018-09-11 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of waste heat boiler Main Steam Temperature Control device and control method |
| CN108518671B (en) * | 2018-04-16 | 2019-10-25 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of waste heat boiler Main Steam Temperature Control device and control method |
| CN109812299A (en) * | 2019-01-17 | 2019-05-28 | 杭州汽轮动力集团有限公司 | A kind of gas turbine turbine rotor cooling means and cooling gas system |
| CN113091047A (en) * | 2021-04-02 | 2021-07-09 | 杭州华电半山发电有限公司 | Control method for main steam desuperheating water of unit |
| CN113091047B (en) * | 2021-04-02 | 2022-07-12 | 杭州华电半山发电有限公司 | Control method for main steam desuperheating water of unit |
| CN113982762A (en) * | 2021-10-27 | 2022-01-28 | 华能国际电力股份有限公司 | Early warning method for combustion temperature of gas turbine |
| CN114033555A (en) * | 2021-11-19 | 2022-02-11 | 华能国际电力股份有限公司 | Method for reducing yellow smoke emission time |
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