CN110500184B - Waste heat utilization system for improving gas turbine combined cycle economy - Google Patents
Waste heat utilization system for improving gas turbine combined cycle economy Download PDFInfo
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- CN110500184B CN110500184B CN201910799207.2A CN201910799207A CN110500184B CN 110500184 B CN110500184 B CN 110500184B CN 201910799207 A CN201910799207 A CN 201910799207A CN 110500184 B CN110500184 B CN 110500184B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/08—Heating air supply before combustion, e.g. by exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
Abstract
The invention provides a waste heat utilization system for improving the combined cycle economy of a gas turbine, which comprises a vertical tubular air preheater for improving the temperature of inlet air; and the main path flue is arranged between the waste heat boiler and the vertical tubular air preheater and comprises an air inlet flue and an exhaust flue, the air inlet flue is arranged between a low-temperature economizer flue gas side inlet flue of the waste heat boiler and an inlet of the vertical tubular air preheater and transmits the flue gas waste heat of the waste heat boiler to the vertical tubular air preheater, and the exhaust flue is arranged between an outlet of the vertical tubular air preheater and a flue gas side outlet flue of the low-temperature economizer of the waste heat boiler and transmits the flue gas after heat exchange of the vertical tubular air preheater to the waste heat boiler. The invention adopts part of low-grade smoke extracted from the inlet smoke side of the low-temperature economizer of the waste heat boiler to heat the inlet air of the compressor, thereby realizing the cascade utilization of waste heat, further reducing the smoke exhaust temperature of the waste heat boiler, improving the efficiency of the waste heat boiler and improving the operation economy of the combined cycle unit.
Description
Technical Field
The invention relates to performance optimization of a gas turbine combined cycle unit, in particular to a system for improving the running economy of the gas turbine combined cycle unit by adopting a flue gas waste heat utilization technology.
Background
The gas turbine combined cycle unit not only can be used as a peak regulation unit, but also has the capacity of driving a basic load, particularly for a gas turbine combined heat and power generation unit, the operation mode is 'fixing power by heat', and the power generation load is relatively stable relative to the peak regulation unit. However, as the installed capacity of the power unit is continuously increased, the gas unit is difficult to keep running under the rated load, the unit running economy is poor under partial load due to high heat consumption rate, and particularly under the background of the current peak shaving auxiliary service policy, the gas power plant faces the pressure of further reducing the generating load of the unit, so that the unit economy is further reduced. Moreover, for the gas turbine combined cycle unit which has been put into operation for a long time, the exhaust gas temperature is increased, the efficiency of the waste heat boiler is reduced and the running economy of the combined cycle unit is poor due to the unavoidable scaling phenomenon of the pipe wall of the waste heat boiler heat exchanger. Therefore, how to improve the running performance of the gas turbine combined cycle unit under partial load is an urgent problem to be solved.
The compressor equipment in the gas turbine is a rotary air compression device with constant volume, and the operation performance of the compressor equipment is greatly influenced by environmental conditions. As the ambient temperature increases, the air density decreases, resulting in a decrease in the mass flow of air into the compressor. Typically, the compressor inlet is equipped with a rotatable guide vane, and the air flow rate is varied by adjusting the inlet rotatable guide vane angle (IGV) to improve the economy of the combined cycle gas turbine unit at part load. When the power generation load of the gas turbine is kept unchanged, along with the gradual rise of the environmental temperature, the temperature of air at the outlet of the gas compressor gradually rises, the angle of the rotatable guide vane at the inlet of the gas compressor is gradually increased, the throttling loss at the inlet of the gas compressor is reduced, the operation load rate of the gas turbine gradually rises, and the heat consumption rate of the gas turbine is reduced.
The utility model discloses "gas turbine compressor inlet air temperature regulating device" (patent number ZL200520033435.2), "be used for the air heating mechanism (patent number ZL201721358582.6) of gas turbine air intake system compressor entry" has the following problem:
(1) when the environmental temperature is lower in winter and the temperature of the gas turbine is adjusted by adjusting the water quantity in the operation process of the gas turbine, if the water quantity is insufficient; or when the water inlet of the air inlet heater is cut off, the stored water in the air inlet heater can be frozen to crack the air inlet heater, so that the heater pipe is damaged. Further pipe damage may cause water deposits to be carried into the compressor, which may compromise the safe operation of the gas turbine.
(2) For the gas turbine combined cycle unit which is put into production, the exhaust gas temperature of the waste heat boiler is influenced by factors such as scaling of the tube wall of the heat exchanger, so that the exhaust gas temperature is increased, and the heat transfer performance of the waste heat boiler is reduced. The prior art does not provide an effective method for further reducing the exhaust gas temperature, so that the economic improvement effect of the combined cycle unit is not obvious.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a set of flue gas waste heat utilization system is designed, the temperature of air at the inlet of the air compressor is heated by utilizing the waste heat of the exhaust gas of the waste heat boiler, the load rate of the gas turbine is improved, the exhaust gas temperature of the waste heat boiler is further reduced, and the operation economy of the combined cycle unit under partial load is improved.
In order to achieve the above object, the present invention provides a waste heat utilization system for improving the economy of a gas turbine combined cycle, which is used for improving the part load performance of a gas turbine combined cycle unit, and comprises:
the vertical pipe type air preheater is arranged at the inlet of the gas turbine compressor and used for exchanging heat for inlet air at the inlet of the gas turbine compressor so as to improve the temperature of the inlet air; and
the main path flue is arranged between the waste heat boiler and the vertical tubular air preheater and comprises an air inlet flue and an exhaust flue, the air inlet flue is arranged between a low-temperature economizer flue gas side inlet flue of the waste heat boiler and an inlet of the vertical tubular air preheater and transmits the flue gas waste heat of the waste heat boiler to the vertical tubular air preheater, and the exhaust flue is arranged between an outlet of the vertical tubular air preheater and a flue gas side outlet flue of the low-temperature economizer of the waste heat boiler and transmits the flue gas after heat exchange of the vertical tubular air preheater to the waste heat boiler.
Further, the low-temperature economizer comprises a bypass flue, wherein the bypass flue is arranged between the air inlet flue and the exhaust flue so that flue gas enters the air inlet flue and directly enters the exhaust flue without passing through the vertical tubular air preheater and is discharged from the flue gas side outlet flue of the low-temperature economizer.
Further, an air inlet control valve is arranged in the air inlet flue and used for adjusting the amount of flue gas entering the vertical tubular air preheater from the air inlet flue.
Still further, the air intake control valve may gradually open the bypass flue while gradually closing the air intake flue.
Further, an exhaust control valve is provided in the exhaust flue, and the exhaust control valve is used for adjusting the amount of flue gas entering the exhaust flue from the bypass flue.
Still further, the exhaust control valve may gradually open the bypass flue while gradually closing the exhaust flue.
Furthermore, one end of the bypass flue is arranged between the air inlet control valve and the flue gas inlet side of the low-temperature economizer of the waste heat boiler, and the other end of the bypass flue is arranged between the exhaust control valve and the flue gas outlet side of the low-temperature economizer of the waste heat boiler, so that the air inlet control valve and the exhaust control valve can adjust the amount of flue gas entering the exhaust flue from the air inlet flue.
Further, the air inlet control valve adopts an air inlet flue baffle plate, the air inlet flue baffle plate is used for adjusting the proportion of hot flue gas entering the vertical tubular air preheater and the bypass flue, and the bypass flue is closed when the main flue is opened.
Further, the exhaust control valve adopts an air outlet flue baffle, and the bypass flue is closed when the main path flue is opened by the air outlet flue baffle.
Furthermore, an induced draft fan is arranged in the main flue and used for controlling the flow of flue gas in the flue.
Furthermore, a first pressure measuring device and a first temperature measuring device are arranged on the air inlet flue.
Still further, the first pressure measuring device is located before the first temperature measuring device.
Furthermore, a second pressure measuring device and a second temperature measuring device are arranged on the exhaust flue.
Still further, the second pressure measuring device is located before the second temperature measuring device.
Further, a third pressure measuring device and a third temperature measuring device are arranged in the inlet channel of the gas turbine compressor and used for detecting the pressure and the temperature of the air after heat exchange.
Still further, the third pressure measuring device is located before the third temperature measuring device.
Furthermore, the system also comprises a first flow measuring device which is positioned between the air outlet flue baffle in the main flue and the induced draft fan.
Further, still include an operation controller, it with the flue baffle of admitting air, the flue baffle of giving vent to anger the draught fan with gas turbine's control system is connected, the operation controller adopts following working method:
(1) when the system needs to be put into use, the flue baffle is closed completely, and the induced draft fan is started in a power frequency mode, so that all hot flue gas extracted from the flue gas side inlet of the low-temperature economizer of the waste heat boiler flows through the bypass flue so as to establish a flue gas loop;
(2) keeping the induced draft fan to operate in a power frequency mode, gradually opening the flue baffle until the induced draft fan is fully opened, so that hot flue gas slowly flows through the vertical tubular air preheater, and gradually opening a large IGV angle by a gas turbine control system on the basis of keeping load stable in the process;
(3) the flue baffle is opened completely, and simultaneously the bypass flue is closed, and hot flue gas is whole to be followed vertical tubular air heater flows through, will this moment the draught fan is cut to the frequency conversion mode from the power frequency mode, makes the air temperature after the heating maintain at the setting value unchangeably through adjusting hot flue gas flow.
The invention has the beneficial effects that:
(1) the invention adopts partial bypass flue gas at the inlet flue gas side of the low-temperature economizer of the waste heat boiler to heat the inlet air of the compressor, and does not adopt steam-water working media as heat source media, thereby avoiding the problem of the operation safety of the gas turbine caused by the damage of heat exchanger equipment due to the water stored in the tubular air preheater when the temperature is lower in winter.
(2) And part of low-grade flue gas extracted from the inlet flue gas side of the low-temperature economizer of the waste heat boiler is used for heating inlet air of the compressor, so that waste heat is utilized in a gradient manner, the exhaust gas temperature of the waste heat boiler can be further reduced, the efficiency of the waste heat boiler is improved, and the running economy of the combined cycle unit is improved.
(3) Furthermore, the bypass flue and the flue are arranged, the air inlet control valve and/or the air exhaust control valve improve the flexibility of the flue gas waste heat utilization system, the frequency conversion draught fan is arranged, the frequency is adjusted to realize accurate control on the heated air temperature, and the control flexibility is improved.
Drawings
FIG. 1 is a schematic diagram of a waste heat utilization system for improving the economy of a gas turbine combined cycle according to the present invention.
Description of reference numerals:
exhaust-heat boiler 100
Low-temperature economizer 101
Intake air filter 202
Vertical tubular air preheater 1
Bypass flue 3
Intake flue damper 31
Draught fan 4
First pressure measuring device 51
First temperature measuring device 52
Second pressure measuring device 61
Second temperature measuring device 62
Third pressure measuring device 71
Third temperature measuring device 72
First flow measuring device 81
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Certain terminology may be used herein for the convenience of the reader only and is not to be taken as a limitation on the scope of the invention. For example, words such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "horizontal," "vertical," "upstream," "downstream," "front," "back," etc., merely describe the configuration shown in the figures. Of course, one or more elements of an embodiment of the invention may be oriented in any direction and the terminology, therefore, should be understood as encompassing such variations unless specified otherwise.
Referring to fig. 1, the waste heat utilization system for improving the combined cycle economy of the gas turbine provided by the invention comprises a vertical tubular air preheater 1, a main flue 2 and a bypass flue 3. The vertical tube type air preheater 1 is disposed at an inlet of a compressor 201 of the gas turbine 200, and is configured to exchange heat with inlet air at the inlet of the compressor 201 of the gas turbine to increase a temperature of the inlet air. The main flue 2 is arranged between the waste heat boiler 100 and the vertical tubular air preheater 1, the main flue 2 comprises an air inlet flue 21 and an air outlet flue 22, the air inlet flue 21 is arranged between a flue at the flue gas side inlet of the low-temperature economizer 101 of the waste heat boiler 100 and the inlet of the vertical tubular air preheater 1, and the flue gas waste heat of the waste heat boiler 100 is transferred to the vertical tubular air preheater 1; the exhaust flue 22 is arranged between the outlet of the vertical tubular air preheater 1 and the flue gas side outlet flue of the low-temperature economizer 101 of the waste heat boiler 100, and transmits the flue gas entering the vertical tubular air preheater 1 for heat exchange to the waste heat boiler 100. The bypass flue 2 is arranged between the inlet flue 21 and the exhaust flue 22 so that flue gas entering the inlet flue 21 does not pass through the vertical tube air preheater 1 and directly enters the exhaust flue 22 to be discharged from the flue gas side outlet flue of the low-temperature economizer 201.
Further, an air intake control valve is provided in the air intake flue 21, and the air intake control valve is used for adjusting the amount of flue gas entering the vertical tube air preheater from the air intake flue. The intake control valve gradually opens the bypass flue 3 at the same time as the intake flue 21 is gradually closed. The intake control valve employs an intake flue damper 31 in the present embodiment. The air inlet flue baffle 31 is used for adjusting the proportion of flue gas entering the vertical tubular air preheater 1 and the bypass flue 3. Wherein it closes the bypass chimney 3 when the main chimney 2 is opened.
Further, an exhaust control valve for adjusting the amount of flue gas entering the exhaust flue 22 from the bypass flue 3 is provided in the exhaust flue 22. The exhaust control valve will simultaneously gradually open the bypass flue 3 when gradually closing the exhaust flue. The exhaust control valve in this embodiment employs an outlet flue damper 32. The outlet flue damper 32 may further control the proportion of flue gas entering the exhaust flue 22. When the bypass 3 is opened, the exhaust gas duct 22 of the main flue 2 is closed.
One end of the bypass flue 3 is arranged between the inlet flue baffle 31 and the flue gas side inlet flue of the low-temperature economizer 101 of the waste heat boiler 100, and the other end is arranged between the outlet flue baffle 32 and the flue gas side outlet flue of the low-temperature economizer 101 of the waste heat boiler 100, so that the inlet flue baffle 31 and the outlet flue baffle 32 can adjust the amount of flue gas entering the exhaust flue 22 from the inlet flue 21.
And an induced draft fan 4 is arranged in the main path flue and is used for controlling the flue gas flow in the main path flue 2. In this embodiment, the induced draft fan 4 is disposed within the exhaust stack 22 of the main path stack 2. The induced draft fan can operate under power frequency or frequency conversion mode.
Further, a first pressure measuring device 51 and a first temperature measuring device 52 are provided in the intake air flue 21. The first pressure measuring device 51 is located before the first temperature measuring device 52. A second pressure measuring device 61 and a second temperature measuring device 62 are provided on the exhaust gas flue 22. The second pressure measuring device 61 is located before the second temperature measuring device 62.
A third pressure measuring device 71 and a third temperature measuring device 72 are provided in an inlet passage of the compressor 201 of the gas turbine 200 for detecting the pressure and temperature of the inlet air after heat exchange. The third pressure measuring device 71 is located before the third temperature measuring device 72.
The first flow measuring device 81 is located in the main flue 2 and between the air outlet flue baffle 32 and the induced draft fan 4, and is used for measuring the flue gas flow of the exhaust flue 22.
It can be seen from the figure that the inlet flue damper 31 and the outlet flue damper 32 of the present invention are designed more skillfully, the proportion of the flue gas entering the exhaust flue 22 can be further controlled conveniently by the proportion degree of opening, and the structure is simple and practical.
The waste heat utilization system for improving the economy of the combined cycle of the gas turbine can also comprise an operation controller so as to further improve the waste heat utilization efficiency of the waste heat utilization system for improving the economy of the combined cycle of the gas turbine. The operation controller is connected with a control system (not shown in the figure) of the air inlet flue baffle 31, the air outlet flue baffle 32, the induced draft fan 4 and the gas turbine 200, and adopts the following working modes:
(1) when the system needs to be put into use, the air inlet flue baffle 31 and the air outlet flue baffle 32 are completely closed, and the induced draft fan 4 is started in a power frequency mode, so that hot flue gas extracted from the flue gas side inlet of the low-temperature economizer 101 of the waste heat boiler flows through the bypass flue 3 so as to establish a flue gas loop;
(2) keeping the induced draft fan 4 running in a power frequency mode, gradually opening the air inlet flue baffle 31 and the air outlet flue baffle 32 to enable hot flue gas to slowly flow through the vertical tubular air preheater 1, and gradually opening a large IGV angle by a control system of the gas turbine 200 on the basis of keeping load stable in the process;
(3) the air inlet flue baffle 31 and the air outlet flue baffle 32 are fully opened, meanwhile, the bypass flue 3 is closed, hot flue gas completely flows through the vertical tubular air preheater 1, the induced draft fan 4 is switched to a frequency conversion mode from a power frequency mode, and the heated air temperature is kept unchanged at a set value by adjusting the flow of the hot flue gas.
Referring to fig. 1 again, the flue gas side inlet of the tubular air preheater 1 is connected to the air intake flue 21 of the main flue 2 through an upper tube plate, and the flue gas in the flue is extracted from the inlet flue gas side of the low-temperature economizer 101 of the waste heat boiler 100 and used as the heat source fluid of the heat exchanger. The flue gas side outlet of the vertical tubular air preheater 1 is connected with the exhaust flue 22 of the main flue through a lower tube plate, and the flue gas after heat exchange converges to the flue gas side outlet of the low-temperature economizer 101 of the waste heat boiler 100 and is discharged into a chimney together with the exhaust smoke.
In one embodiment, when the flue gas waste heat utilization system of the invention needs to be put into use, the flue baffle is closed completely, the induced draft fan is started in a power frequency mode, and the hot flue gas completely passes through the bypass flue 3 to form a circulation loop. After the flue gas loop is established, the flue baffles are gradually opened, so that the hot flue gas gradually flows through the vertical tubular air preheater 1 until the flue baffles are fully opened, and at the moment, the hot flue gas completely passes through the vertical tubular air preheater 1. At this moment, can cut the frequency conversion from the power frequency with draught fan 4 operation mode, change the hot flue gas flow who takes out from exhaust-heat boiler 100 through the regulating frequency, realize the accurate control to the air temperature after the heating.
The method comprises the steps that partial flue gas extracted from the inlet flue gas side of a low-temperature economizer 101 of a waste heat boiler 100 passes through a first pressure measuring device 51 and a first temperature measuring device 52, the pressure and the temperature of hot flue gas extracted from the waste heat boiler 100 are respectively measured, the hot flue gas transfers heat to air through a vertical tubular air preheater 1, then enters an induced draft fan 4 through a main flue 2 to be boosted, and a second pressure measuring device 61, a second temperature measuring device 62 and a first flow measuring device 81 are arranged in front of the induced draft fan and used for measuring the temperature, the pressure and the flow of the flue gas after heat exchange. The pressure drop of the hot flue gas in the vertical tube air preheater can be measured by the first pressure measuring device 51 and the second pressure measuring device 61, and the temperature drop of the hot flue gas in the vertical tube air preheater can be obtained by the first temperature measuring device 52 and the second temperature measuring device 62.
In addition, a third pressure measuring device 71 and a third temperature measuring device 72 are installed before the inlet air filter 202 of the compressor 201 and after the vertical tube air preheater 1. The atmospheric pressure is compared with the measured value of the pressure measuring device 71, so that the pressure drop of the inlet air when the inlet air flows through the vertical tubular air preheater 1 can be known, and the temperature rise condition of the inlet air can be known by comparing the temperature measured by the third temperature measuring device 72 with the ambient temperature, so that the real-time monitoring of the heat exchange performance of the flue gas waste heat utilization system can be realized.
In one embodiment, a combined cycle unit simulation system of a gas turbine engine of PG9351FA type is established by using Apros software, and the 9F-class gas turbine engine is upgraded by Advanced Gas Path (AGP). Under the working conditions of spring or autumn and winter and under different loads of the gas turbine, calculating the change condition of the economy of the combined cycle unit after the flue gas waste heat utilization system is put into or cut.
Experiment one
Spring or autumn working conditions, the environmental parameters are as follows: ambient temperature 15.6 deg.C, atmospheric pressure 101.58kPa, and relative humidity 82%. Under the condition that the load of the gas turbine is 240MW and 220MW respectively, the economic comparison of the combined cycle unit before and after the flue gas throwing/cutting waste heat utilization system is calculated, and the result is shown in the table 1.
TABLE 1 comparison of performance of combined cycle units of flue gas waste heat utilization system for spring or autumn investment/cutting
Experiment two
Working conditions in winter, the environmental parameters are: ambient temperature 3.6 deg.C, atmospheric pressure 102.59kPa, and relative humidity 78%. Under the condition that the load of the gas turbine is 240MW and 220MW respectively, the economic comparison of the combined cycle unit before and after the flue gas throwing/cutting waste heat utilization system is calculated, and the result is shown in the table 2.
TABLE 2 comparison of performance of combined cycle unit of flue gas waste heat utilization system for winter input/cut
As can be seen from the tables 1 and 2, after the flue gas waste heat utilization system disclosed by the invention is adopted, the air temperature at the inlet of the compressor 201 can be increased by 4.3-5.8 ℃, the exhaust gas temperature of the waste heat boiler 100 is reduced by 3.8-5.8 ℃, the efficiency of the waste heat boiler 100 can be increased by about 1%, the heat consumption rate of a gas turbine is reduced by 34.2-85.8 kJ/(kW.h), the combined cycle heat consumption rate can be reduced by 33.9-70.9 kJ/(kW.h), and the coal consumption rate of the synthetic power generation is 1.16-2.42 g/(kW.h). Although the plant power utilization rate can be increased by using the flue gas waste heat utilization system, the influence of the flue gas waste heat utilization system on the plant power utilization rate only enables the plant power utilization rate to be increased by about 0.10% from the aspect of calculation and analysis. From the comprehensive effect, the flue gas waste heat utilization system can well improve the running economy of the combined cycle unit of the gas turbine at partial load, so the flue gas waste heat utilization system has substantial technical progress.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A waste heat utilization system for enhancing the economics of a gas turbine combined cycle, comprising:
the vertical pipe type air preheater is arranged at the inlet of the gas turbine compressor and used for exchanging heat for inlet air at the inlet of the gas turbine compressor so as to improve the temperature of the inlet air;
the main path flue is arranged between the waste heat boiler and the vertical tubular air preheater and comprises an air inlet flue and an exhaust flue, the air inlet flue is arranged between a flue at the flue side inlet of a low-temperature economizer of the waste heat boiler and an inlet of the vertical tubular air preheater and is used for transmitting the waste heat of the flue gas of the waste heat boiler to the vertical tubular air preheater, and the exhaust flue is arranged between an outlet of the vertical tubular air preheater and the flue at the flue side outlet of the low-temperature economizer of the waste heat boiler and is used for transmitting the flue gas subjected to heat exchange of the vertical tubular air preheater to the waste heat boiler;
a bypass flue disposed between the inlet flue and the exhaust flue so that flue gas entering the inlet flue does not pass through the riser air preheater directly into the exhaust flue and exits the low temperature economizer flue gas side outlet flue;
the air inlet control valve is arranged in the air inlet flue and used for adjusting the amount of flue gas entering the vertical pipe type air preheater from the air inlet flue, and the air inlet control valve can gradually open the bypass flue when gradually closing the air inlet flue;
an exhaust control valve disposed in the exhaust flue for regulating the amount of flue gas entering the exhaust flue from the bypass flue, the exhaust control valve gradually opening the bypass flue while gradually closing the exhaust flue;
the induced draft fan is used for controlling the flue gas flow in the main flue; and
an operation controller connected with the control system of the air inlet control valve, the air exhaust control valve, the induced draft fan and the gas turbine, wherein the operation controller adopts the following working modes:
(1) when a waste heat utilization system for improving the combined cycle economy of the gas turbine needs to be put into operation, the air inlet control valve and the air exhaust control valve are fully closed, and the induced draft fan is started in a power frequency mode, so that all hot flue gas extracted from the flue gas side inlet of the low-temperature economizer of the waste heat boiler flows through the bypass flue so as to establish a flue gas loop;
(2) keeping the induced draft fan to operate in a power frequency mode, gradually opening the air inlet control valve and the air exhaust control valve until the induced draft fan is fully opened, so that hot flue gas slowly flows through the vertical tubular air preheater, and in the process, a gas turbine control system gradually opens a large inlet rotatable guide vane angle on the basis of keeping the load stable; and (3) fully opening the air inlet control valve and the air exhaust control valve, simultaneously closing the bypass flue, completely flowing hot flue gas from the vertical tubular air preheater, switching the induced draft fan to a frequency conversion mode from a power frequency mode, and keeping the heated air temperature unchanged at a set value by adjusting the flow of the hot flue gas.
2. The system of claim 1, wherein the inlet control valve employs an inlet flue damper for regulating the proportion of hot flue gases entering the standpipe air preheater and the bypass flue, which closes the bypass flue when the main flue is open.
3. The system of claim 1, wherein the exhaust control valve employs an outlet flue damper that closes the bypass flue when the main flue is opened.
4. The system of claim 3, further comprising a first flow measurement device positioned in the main flue between the outlet flue damper and the induced draft fan.
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| CN1094496A (en) * | 1992-11-13 | 1994-11-02 | 福斯特·惠勒能源公司 | The circulating fluid bed reactor of combined cycle power generation system |
| JP2006266085A (en) * | 2005-03-22 | 2006-10-05 | Mitsui Eng & Shipbuild Co Ltd | Regenerative cycle type gas turbine power generation system |
| JP2006283655A (en) * | 2005-03-31 | 2006-10-19 | Mitsui Eng & Shipbuild Co Ltd | Surplus steam quantity control system for gas turbine cogeneration system |
| CN101545404A (en) * | 2008-03-24 | 2009-09-30 | 通用电气公司 | A system for extending the turndown range of a turbomachine |
| CN107143391A (en) * | 2016-12-16 | 2017-09-08 | 华北电力大学 | A kind of new middle backheating gas turbine combined cycle system |
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