CN115680884A - Elastic purging device and elastic purging method for gas turbine - Google Patents
Elastic purging device and elastic purging method for gas turbine Download PDFInfo
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- CN115680884A CN115680884A CN202211332937.XA CN202211332937A CN115680884A CN 115680884 A CN115680884 A CN 115680884A CN 202211332937 A CN202211332937 A CN 202211332937A CN 115680884 A CN115680884 A CN 115680884A
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Abstract
The invention relates to the field of gas turbine control, in particular to an elastic purging device and an elastic purging method for a gas turbine. By the method, the starting purging of the gas turbine in the prior art can be changed into elastic purging, and the peak regulation response efficiency and the economy of the unit can be greatly improved.
Description
Technical Field
The invention relates to the field of gas turbine control, in particular to an elastic purging device and an elastic purging method for a gas turbine.
Background
In the prior art, combustible materials may accumulate in the exhaust duct of the gas turbine and in the waste heat boiler. There are various sources of combustibles, depending on the type and characteristics of the fuel. With gas-fueled units, the combustible gas may result from leakage of the gas fuel during standby of the unit, or from incomplete and residual combustion of the fuel prior to shutdown. In a unit using liquid fuel, intermediate combustible gas (such as CO) or carbon powder can remain after insufficient combustion and is attached to the inner surface of a downstream flow passage of the gas turbine. These liquid fuels form a volatile combustible aerosol on the inner surface. When the temperature in the flue reaches the self-ignition point or is above the flash point and has igniters, the combustible gas mist can detonate to damage equipment. In order to ensure the safety of a downstream flow passage of a gas turbine and a waste heat boiler and avoid the accumulation of combustible materials in the downstream flow passage of the gas turbine, domestic power plants generally stipulate air purging before starting as a necessary safety measure.
Chinese patent CN113513409A discloses a purging system for a gas turbine and a control method thereof, the purging system for a gas turbine having a combustor, the purging system for a gas turbine comprising: fuel branch, air supply subassembly and control assembly. The fuel branch is multiple, the fuel branches are communicated with the combustor, the gas source assembly is communicated with the fuel branches, the gas source assembly is used for outputting inert gas to the fuel branches so as to purge the fuel branches before the fuel is supplied to the combustor and after the fuel is withdrawn, the control assembly is communicated with the gas source assembly and the fuel branches, and the control assembly is used for controlling the gas source assembly to purge the fuel branches. The scheme is used for the purging system of the gas turbine, the safety performance is high, the improvement of the combustion stability of the gas turbine is facilitated, and elastic purging cannot be achieved.
Although the types of gas turbines vary, the time required for purging the gas turbines is specified:
the method is characterized in that a combustion engine, a waste heat boiler (and other exhaust systems (such as a bypass chimney) are cleaned and blown before the unit is started and operated in international standards, the cleaning and blowing is at least five times of volume replacement, the typical cleaning and blowing time of the combustion engine at present ranges from 5 minutes to 18 minutes, the time for starting and connecting the combustion engine to a grid can be obviously shortened by reducing the blowing time, meanwhile, the consumption of service power for the high-speed barring blowing is reduced, and particularly, the energy-saving benefit is more remarkable for a peak shaving unit which starts and stops everyday.
In accordance with domestic combustion engine turbine standards, the start control system should provide sufficient time for the gas turbine to automatically purge to ensure safe operation of the gas turbine and downstream components. Unless the country dictates otherwise, the purge cycle should typically purge at least the entire exhaust system space (including the stack) prior to unit ignition. But may not be required for alternative precautions.
Ignition process of the gas turbine: after the unit sends a normal starting instruction, the igniter is pushed into a working position, the pressure control valves of main fuel and duty fuel are opened to a set opening, the static frequency converter is maintained to drive the unit to increase to a high disc rotating speed, the unit maintains the high disc rotating speed to purge an exhaust channel of the gas turbine, the purging time is counted from the rotating speed of 700rpm, after the counting is finished, the gas turbine starts to decrease to the ignition rotating speed of about 500rpm, the igniter of the gas turbine starts to ignite when being electrified, meanwhile, a tripping electromagnetic valve of an oil system is controlled to be closed, safe oil pressure is established, after the safe oil pressure is normal, the related valves of the natural gas supply system are opened, and when flame is detected from the start of fuel input, the ignition success is judged.
The purging is used for ensuring that combustible gas does not accumulate in a downstream exhaust flow channel when the gas turbine is started and ignited so as to avoid the occurrence of explosion accidents. The third book of national gas turbines suggests the necessity of a purge of the engine, but requires only a relatively small amount of three times the volume to be purged compared to five times the international standard, which may not be required for alternative precautions. And the gas turbine is purged during the period from starting to igniting, the parameter is not counted in the purging time of the gas turbine, and operators directly calculate the volume of three times of the engine or the ignition time in shorter time before using the visual device for online monitoring.
However, in the measure, the uncertain factor is too large, the reduction of the purging time can certainly play a role of a peak shaving unit, but an effective internal condition monitoring scheme is not adopted, so that the operation becomes a blind selection process, for example, internal combustible gas exists, but sufficient purging time is not obtained, and great loss is caused once an accident occurs.
Therefore, a new elastic purging device and elastic purging method for a gas turbine are needed to solve the problems in the prior art.
Disclosure of Invention
In view of this, the invention provides an elastic purging device and an elastic purging method for a gas turbine, which can greatly improve the peak shaving response efficiency and the economy of a unit.
The technical scheme of the invention is as follows:
the elastic purging device of the gas turbine is characterized by comprising a gas turbine exhaust section, a waste heat boiler and a control module;
the gas turbine exhaust section comprises a gas turbine body, an exhaust section and a diffusion section which are sequentially connected, and a first combustible gas detector group is arranged in the exhaust section;
the waste heat boiler comprises a boiler body and a chimney which are mutually connected, and a second combustible gas detector group is arranged in the boiler body;
the diffusion section is connected with the boiler body;
the control module is respectively connected with the gas turbine body, the first combustible gas detector group and the second combustible gas detector group.
Further, first combustible gas detector group includes at least three first combustible gas detector, first combustible gas detector sets up respectively in the inside 10 o ' clock, 12 o ' clock, the 2 o ' clock direction setting along the axial exhaust direction of exhaust section. In the invention, three measuring points are taken at the tail part of a cylindrical exhaust section connected between a gas turbine exhaust cylinder and a boiler diffusion section, sampling holes are formed in the directions of 10 o ' clock, 12 o ' clock and 2 o ' clock along the axial flow direction of gas, a through hole is welded to the outer side of a clamp structure by using a flange, and an internal mechanical seal is not welded and fixed to prevent the metal from being broken under the action of stress.
Furthermore, a high-pressure area, a medium-pressure area and a low-pressure area are sequentially arranged in the boiler body, at least two heating modules are respectively arranged in the high-pressure area, the medium-pressure area and the low-pressure area, the heating modules are sequentially connected, a spacing part is arranged at the top between the adjacent heating modules or the top between the heating module and the chimney, and a second combustible gas detector group is arranged at the spacing part; the second combustible gas detector group comprises at least six second combustible gas detectors, and the second combustible gas detectors in the adjacent partition parts are symmetrically arranged left and right.
In particular, the number of the second combustible gas detectors of the invention is set correspondingly according to the heating modules arranged in the high-pressure region, the medium-pressure region and the low-pressure region.
Preferably, the boiler body of the present invention is implemented using the prior art. The heating module in the boiler is provided with a tube panel which adopts a fin tube for heating steam. The top of each heating module and the adjacent heating module are provided with the spacing parts, and a great deal of research of the applicant finds that the possibility of combustible gas accumulation is high as a geometric structure point, and the position where combustible gas is easy to accumulate is obtained by the applicant through a great deal of creative tests.
In one embodiment of the invention, the second combustible gas detector group comprises six second combustible gas detectors, the second combustible gas detectors are respectively arranged at intervals at the tops of the heating modules in the boiler body and at intervals at the tops between the heating modules and the chimney, the boiler body has six heating modules in total, two heating modules are respectively arranged in a high-pressure area, a medium-pressure area and a low-pressure area, the heating modules are arranged along the axial direction of exhaust, and the second combustible gas detectors which are sequentially provided with a first interval part, a second interval part, a third interval part, a fourth interval part, a fifth interval part and a sixth interval part are arranged on the left side; the second combustible gas detectors of the second spacing part, the fourth spacing part and the sixth spacing part are arranged on the right side.
In the invention, the middle of each heating module is provided with a geometric structure as an interval, the top of the interval is provided with an inspection window, a sampling measuring point is positioned beside the inspection window, the installation and maintenance are convenient, a sampling pipe extends into a distance of 10cm and is provided with a second combustible gas detector, and preferably, the second combustible gas detector is provided with a filtering structure.
Furthermore, the control module is provided with a two-out-of-three redundancy voting program, and signals of the two-out-of-three redundancy voting program are respectively taken from the first combustible gas detector group and the second combustible gas detector group. In the invention, a two-out-of-three redundancy voting program is adopted as the prior art, signals output by a field combustible gas detector group are transmitted to a control module, and an action signal cannot be sent to a gas turbine unit control system only when one detector gives an alarm, and an action signal can be sent to the gas turbine unit control system only when two or more detectors give alarms at the same time.
Further, the control module includes a resilient purge control routine, the resilient purge control routine setting including:
entering a purge time of three volumes when the gas alarm concentration is 1-5% lel;
entering a purge time of five volumes when the gas alarm concentration is 6-25% LEL;
if the gas alarm concentration value is 0, directly entering a starting state or manually selecting whether to prolong the purging time;
the LEL performs a troubleshooting process on the gas turbine fuel system when the gas warning concentration is greater than 25%.
Preferably, the first combustible gas detector group can be arranged at a place where combustible gas is easy to detect according to the exhaust flow passage structure of the exhaust section, the characteristics of the combustible gas and the airflow direction.
Preferably, the combustible gas detector adopts a pump-suction type detector, gas in the exhaust channel is detected and analyzed before starting the engine, gas in a detection area is sent to the detector to be detected in a sampling mode, the detector sends out a configuration signal after detecting a concentration signal of the combustible gas, and if the concentration value is lower than an alarm value, the control system allows a start instruction to be directly sent.
The invention also provides an elastic purging method of a gas turbine, which is characterized by comprising the elastic purging device of the gas turbine, and the elastic purging device comprises the following steps:
adding a first combustible gas detector group at the exhaust section of the gas turbine to monitor the condition of combustible gas at the exhaust section of the gas turbine;
a second combustible gas detector group is added in the waste heat boiler to monitor the condition of the combustible gas of the waste heat boiler;
and an elastic purging program is added into the control module to realize automatic elastic purging of the gas turbine.
The method can effectively reduce the purging time by five times of the volume, and performs purging when the combustible gas detector detects the concentration of the combustible gas, and does not perform purging when the combustible gas detector does not detect the concentration of the combustible gas.
Before starting the engine, detecting the concentration of combustible gas in an exhaust section of the gas turbine and the concentration of combustible gas in a waste heat boiler; setting two-stage alarm for gas alarm concentration value, and dividing the purging procedure into three stages; wherein the primary gas alarm concentration is set at 5% LEL, the purging time is set at three times the volumetric time, the secondary gas alarm concentration is set at 25% LEL, the purging time is set at five times the volumetric time, the tertiary gas alarm concentration value is 0, and the start-up state is entered directly or whether the purging time is extended is selected manually.
According to the invention, after the combustible gas detector group detects gas in the space, detection data is transmitted to the unit control system, and the data is incorporated into the before-start purging logic to realize elastic purging, so that the unit correspondingly selects preset purging time according to the concentration value of the combustible gas before starting. This approach ensures safety and can be used to monitor the operating condition of the fuel system valve block and the completeness of combustion.
Furthermore, the method also comprises the steps of determining that a combustible gas concentration detection program is executed for a long time, detecting the combustible gas concentration in the exhaust section of the gas turbine and the waste heat boiler after shutdown, and judging that combustible gas does not exist in the exhaust section of the gas turbine and the waste heat boiler before starting the engine.
Furthermore, the invention also comprises the steps of detecting the concentration of the combustible gas during shutdown, setting two sections of alarms according to the gas alarm concentration value, and operating according to the actual condition when the concentration of two or more depth detectors in the combustible gas detector group is higher than the explosion lower limit: entering a three-volume purge time when the gas alarm concentration is 1-5% LEL; entering a five-time purge volume time when the gas alarm concentration is 6-25% LEL; if the gas alarm concentration value is 0, directly entering a starting state or manually selecting whether to prolong the purging time; the fuel system of the gas turbine is investigated when the gas warning concentration is greater than 25%LEL.
The invention also provides another elastic purging method of the gas turbine, which is characterized by comprising the elastic purging device of the gas turbine, and the elastic purging method comprises the following steps:
A. when the gas turbine is shut down, the concentration of combustible gas at the exhaust section of the gas turbine is detected, and a gas alarm concentration value is set for two-section alarm;
B. detecting the concentration of combustible gas of the waste heat boiler during shutdown, and setting a gas alarm concentration value as a two-stage alarm;
C. when the concentration of two or more depth detectors in the combustible gas detector group is higher than a certain explosion lower limit output signal; the following operations were carried out: entering a three-volume purge time when the gas alarm concentration is 1-5% LEL; entering a five volume purge time when the gas alarm concentration is 6-25% LEL; troubleshooting the fuel system of the gas turbine when the gas warning concentration is greater than 25% LEL;
D. when the gas alarm concentration value is 0, directly entering a starting state or letting an operator select whether to prolong the purging time.
Further, in the step A, the combustible gas concentration of the gas turbine exhaust section is set to two-section alarm, wherein one-section alarm is set to 5% LEL, and the second-section alarm is set to 25% LEL; in said step B, the waste heat boiler combustible gas concentration is set to two-stage alarm, one stage is 5% LEL, and two stage is 25% LEL; and in the step C, extracting gas concentration data of the combustible gas detector, and judging whether to send an elastic purging signal to the combustion engine or not by the control module through a signal obtained by a two-out-of-three redundancy voting program.
Furthermore, purging is performed when the combustible gas detector detects the concentration of the combustible gas, and purging is not performed when the concentration of the combustible gas is not detected.
According to the invention, combustible gas detectors are respectively added in the exhaust section of the gas turbine and the waste heat boiler to monitor combustible gas in the exhaust runner of the gas turbine, signals of the combustible gas detectors are controlled through a two-out-of-three redundancy voting program, and the control module is used for extracting gas concentration data and determining whether to send an elastic purging signal. The device and the method can effectively reduce the starting time of the gas unit and greatly improve the peak shaving response efficiency and the economy of the unit.
When the combustible gas detector group does not detect the gas concentration in the exhaust runner space of the combustion engine, the start-up purging can be cancelled, the load time of the combustion engine after the start-up purging is cancelled, the volume flow when the purging is removed by calculating the volume of the exhaust runner space can be reduced by 14 minutes at most, the heat loss of the purging airflow to the boiler economizer is reduced, and the load time of a grid-connected belt can be reduced when the steam turbine boiler is in a hot state and a warm state.
During purging, cold air enters from the gas turbine to the boiler volume environment three to five times, so that the metal temperature, the water temperature and the steam pressure of a boiler header are reduced, the separation of superheated steam condensate water is accelerated, the drainage time is prolonged, the loading rate of the gas turbine is limited, and the grid-connected loading time of the steam turbine is delayed. Compared with an exemplary power plant without the combustion engine blowing and cleaning, the method has the advantage that the grid-connected loading can be advanced by 5 minutes by eliminating the combustion engine blowing and cleaning steam turbine.
Compared with the part of gains of reducing the heat energy loss of the system after the blowing is cancelled, the combined cycle grid-connected loading time is shortened by 20 minutes, and with the increasing emphasis on the peak regulation response and the auxiliary service of the power grid, the combined cycle grid-connected loading method can bring considerable indirect value to the power plant, and can possibly obtain better auxiliary service compensation and power spot-order transaction opportunities besides improving the priority scheduling sequence of the power plant on the power grid.
The invention has the beneficial effects that:
1. the unit is quickly connected to the grid and put into operation, and the corresponding power generation and heat supply output of the unit is improved;
2. the unit quickly responds to the power grid requirement, and the unit has a prominent advantage on bidding and surfing;
3. the unit is quickly started, the heat loss of the hot water side is less, the steam-water system is quickly responded, and the income is improved;
4. the hot channel and the boiler part are quickly cooled for a short time, the thermal stress damage is reduced, and the service life of the hot channel part is prolonged;
5. the single start-up purging time is reduced, and the auxiliary power is saved.
Drawings
FIG. 1 is a schematic view of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a flexible purge flow scheme of a method according to an embodiment of the invention;
fig. 4 is a schematic diagram illustrating the working principle of the two-out-of-three redundancy voting procedure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
An elastic purging device of a gas turbine is characterized by comprising a gas turbine exhaust section 1, a waste heat boiler 2 and a control module (not labeled);
the gas turbine exhaust section comprises a gas turbine body 11, an exhaust section 12 and a diffusion section 13 which are connected in sequence, and a first combustible gas detector group 3 is arranged in the exhaust section;
the waste heat boiler comprises a boiler body 21 and a chimney 22 which are mutually connected, and a second combustible gas detector group 4 is arranged in the boiler body;
the diffusion section is connected with the boiler body;
the control module is respectively connected with the gas turbine body, the first combustible gas detector group and the second combustible gas detector group.
Further, the first combustible gas detector group comprises at least three first combustible gas detectors 31, and the first combustible gas detectors are respectively arranged inside the exhaust section along the axial exhaust direction at 10 o ' clock, 12 o ' clock and 2 o ' clock.
Further, a high-pressure area 211, a medium-pressure area 212 and a low-pressure area 213 are sequentially arranged in the boiler body, at least two heating modules 5 are respectively arranged in the high-pressure area, the medium-pressure area and the low-pressure area, the heating modules are sequentially connected, a spacing part (not labeled) is arranged at the top between the adjacent heating modules or the top between the heating module and the chimney, and a second combustible gas detector group is arranged at the spacing part; the second combustible gas detector group comprises at least six second combustible gas detectors 41, and the second combustible gas detectors in the adjacent partition parts are symmetrically arranged left and right.
Furthermore, the control module is provided with a two-out-of-three redundancy voting program, and signals of the two-out-of-three redundancy voting program are respectively taken from the first combustible gas detector group and the second combustible gas detector group.
Example 2
The embodiment provides a gas turbine elastic purging device with the same structure as that of embodiment 1, except that the second combustible gas detector group comprises six second combustible gas detectors, the second combustible gas detectors are respectively arranged at intervals at the tops of heating modules in a boiler body and at intervals at the tops between the heating modules and a chimney, the boiler body comprises six heating modules in total, two heating modules are respectively arranged in a high-pressure area, a medium-pressure area and a low-pressure area and are arranged along the axial direction of exhaust, a first partition part, a second partition part, a third partition part, a fourth partition part, a fifth partition part and a sixth partition part are sequentially arranged in the high-pressure area, and the second combustible gas detectors of the first partition part, the third partition part and the fifth partition part are arranged on the left side; and the second combustible gas detectors of the second spacing part, the fourth spacing part and the sixth spacing part are arranged on the right side.
Example 3
The embodiment provides a gas turbine elastic purging device with the same structure as that of embodiment 1, except that the second combustible gas detector group comprises six second combustible gas detectors, the second combustible gas detectors are respectively arranged at intervals at the tops of heating modules in a boiler body and at intervals at the tops between the heating modules and a chimney, the boiler body comprises six heating modules in total, two heating modules are respectively arranged in a high-pressure area, a medium-pressure area and a low-pressure area and are arranged along the axial direction of exhaust, a first partition part, a second partition part, a third partition part, a fourth partition part, a fifth partition part and a sixth partition part are sequentially arranged in the high-pressure area, and the second combustible gas detectors of the first partition part, the third partition part and the fifth partition part are arranged on the right side; and the second combustible gas detectors of the second spacing part, the fourth spacing part and the sixth spacing part are arranged on the left side.
Example 4
This embodiment provides a gas turbine resilient purge apparatus of the same construction as any of embodiments 1-3, except that the control module includes a resilient purge control routine, the resilient purge control routine setting including:
entering a purge time of three volumes when the gas alarm concentration is 1-5% LEL;
entering a purge time of five volumes when the gas alarm concentration is 6-25% LEL;
if the gas alarm concentration value is 0, directly entering a starting state or manually selecting whether to prolong the purging time;
the LEL performs a troubleshooting process on the gas turbine fuel system when the gas warning concentration is greater than 25%.
Preferably, the first combustible gas detector group can be arranged at a place where combustible gas is easy to detect according to the exhaust flow passage structure of the exhaust section, the characteristics of the combustible gas and the airflow direction.
Example 5
The elastic purging method of the gas turbine is characterized by comprising the elastic purging device of the gas turbine, and comprises the following steps:
adding a first combustible gas detector group at the exhaust section of the gas turbine to monitor the condition of combustible gas at the exhaust section of the gas turbine;
a second combustible gas detector group is added in the waste heat boiler to monitor the condition of the combustible gas of the waste heat boiler;
and adding an elastic purging program into the control module to realize automatic elastic purging of the gas turbine.
Before starting, detecting the combustible gas concentration of the exhaust section of the gas turbine and the waste heat boiler; setting two-stage alarm for gas alarm concentration values, and dividing a purging program into three stages; wherein, the first level gas alarm concentration is set at 5% LEL, the purging time is set at three times of volume time, the second level gas alarm concentration is set at 25% LEL, the purging time is set at five times of volume time, the third level gas alarm concentration value is 0, and whether the purging time is prolonged or not is directly entered into a starting state or manually selected.
And further, determining that a combustible gas concentration detection program is executed for a long time, detecting the combustible gas concentrations in the gas turbine exhaust section and the waste heat boiler after shutdown, and judging that combustible gas does not exist in the gas turbine exhaust section and the waste heat boiler before starting.
And further, detecting the concentration of the combustible gas during shutdown, setting a gas alarm concentration value for two-stage alarm, and operating according to actual conditions when the concentration of two or more depth detectors in the combustible gas detector group is higher than the explosion lower limit: entering a three-volume purge time when the gas alarm concentration is 1-5% LEL; entering a five-time purge volume time when the gas alarm concentration is 6-25% LEL; if the gas alarm concentration value is 0, directly entering a starting state or manually selecting whether to prolong the purging time; the LEL performs a troubleshooting process on the gas turbine fuel system when the gas warning concentration is greater than 25%.
Example 6
A gas turbine elastic purging method comprises a gas turbine elastic purging device of embodiment 1, and comprises the following steps:
A. when the gas turbine is shut down, the concentration of combustible gas at the exhaust section of the gas turbine is detected, and a gas alarm concentration value is set for two-section alarm;
B. detecting the concentration of combustible gas of the waste heat boiler during shutdown, and setting a gas alarm concentration value as a two-stage alarm;
C. when the concentration of two or more depth detectors in the combustible gas detector group is higher than a certain explosion lower limit output signal; the following operations were carried out: entering a three-volume purge time when the gas alarm concentration is 1-5% LEL; entering five times of volume purging time when the gas alarm concentration is 6-25% LEL; troubleshooting the fuel system of the gas turbine when the gas warning concentration is greater than 25%LEL;
D. when the gas alarm concentration value is 0, directly entering a starting state or letting an operator select whether to prolong the purging time.
Further, in the step A, the combustible gas concentration of the gas turbine exhaust section is set to two-section alarm, wherein one-section alarm is set to 5% LEL, and the second-section alarm is set to 25% LEL; in said step B, the waste heat boiler combustible gas concentration is set to two-stage alarm, one stage is 5% LEL, and two stage is 25% LEL; and C, extracting gas concentration data of the combustible gas detector, and judging whether to send an elastic purging signal to the combustion engine or not by the control module through a signal obtained by a two-out-of-three redundancy voting program.
Furthermore, purging is performed when the combustible gas detector detects the concentration of the combustible gas, and purging is not performed when the concentration of the combustible gas is not detected.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art. It should be noted that the technical features not described in detail in the present invention can be implemented by any prior art in the field.
Claims (10)
1. The elastic purging device of the gas turbine is characterized by comprising a gas turbine exhaust section, a waste heat boiler and a control module;
the gas turbine exhaust section comprises a gas turbine body, an exhaust section and a diffusion section which are sequentially connected, and a first combustible gas detector group is arranged in the exhaust section;
the waste heat boiler comprises a boiler body and a chimney which are mutually connected, and a second combustible gas detector group is arranged in the boiler body;
the diffusion section is connected with the boiler body;
the control module is respectively connected with the gas turbine body, the first combustible gas detector group and the second combustible gas detector group.
2. The gas turbine elastic purging device according to claim 1, wherein the first combustible gas detector group comprises at least three first combustible gas detectors, and the first combustible gas detectors are respectively arranged inside the exhaust section along the directions of 10 o ' clock, 12 o ' clock and 2 o ' clock of the axial exhaust direction.
3. The elastic purging device for the gas turbine as claimed in claim 2, wherein a high-pressure area, a medium-pressure area and a low-pressure area are sequentially arranged in the boiler body, at least two heating modules are respectively arranged in the high-pressure area, the medium-pressure area and the low-pressure area, the heating modules are sequentially connected, a spacer is arranged at the top between the adjacent heating modules or at the top between the heating module and a chimney, and a second combustible gas detector group is arranged at the spacer; the second combustible gas detector group comprises at least six second combustible gas detectors, and the second combustible gas detectors in the adjacent partition parts are symmetrically arranged left and right.
4. The gas turbine elastic purging device according to claim 3, wherein the control module is provided with a two-out-of-three redundant voting program, and signals of the two-out-of-three redundant voting program are respectively taken from the first combustible gas detector group and the second combustible gas detector group.
5. The gas turbine resilient purge apparatus of claim 4, wherein the control module comprises a resilient purge control routine, the resilient purge control routine setting comprising:
entering a purge time of three volumes when the gas alarm concentration is 1-5% LEL;
entering a purge time of five volumes when the gas alarm concentration is 6-25% LEL;
if the gas alarm concentration value is 0, directly entering a starting state or manually selecting whether to prolong the purging time;
the LEL performs a troubleshooting process on the gas turbine fuel system when the gas warning concentration is greater than 25%.
6. A method for elastically purging a gas turbine, comprising the elastically purging device for a gas turbine according to any one of claims 1 to 5, comprising:
adding a first combustible gas detector group at the exhaust section of the gas turbine to monitor the condition of combustible gas at the exhaust section of the gas turbine;
a second combustible gas detector group is added in the waste heat boiler to monitor the condition of the combustible gas of the waste heat boiler;
adding an elastic purging program into the control module to realize automatic elastic purging of the gas turbine;
before starting the engine, detecting the combustible gas concentrations of an exhaust section of the gas turbine and a waste heat boiler; setting two-stage alarm for gas alarm concentration values, and dividing a purging program into three stages; wherein the primary gas alarm concentration is set at 5% LEL, the purging time is set at three times the volumetric time, the secondary gas alarm concentration is set at 25% LEL, the purging time is set at five times the volumetric time, the tertiary gas alarm concentration value is 0, and the start-up state is entered directly or whether the purging time is extended is selected manually.
7. The gas turbine elastic purging method according to claim 6, further comprising determining that a combustible gas concentration detection program is executed for a long time, detecting the combustible gas concentrations in the gas turbine exhaust section and the exhaust heat boiler after shutdown, and judging that combustible gas does not exist in the gas turbine exhaust section and the exhaust heat boiler before startup.
8. The gas turbine elastic purging method as claimed in claim 7, further comprising detecting the combustible gas concentration during shutdown, setting two-stage alarm for the gas alarm concentration value, and operating according to actual conditions when the concentration of two or more depth detectors in the combustible gas detector group is higher than the explosion lower limit: entering triple volume time when the gas alarm concentration is 1-5% LEL; entering five times of volume time when the gas alarm concentration is 6-25% LEL; if the gas alarm concentration value is 0, directly entering a starting state or manually selecting whether to prolong the purging time; the LEL performs a troubleshooting process on the gas turbine fuel system when the gas warning concentration is greater than 25%.
9. A method for elastically purging a gas turbine, comprising the elastically purging device for a gas turbine as claimed in any one of claims 1 to 5, comprising the steps of:
A. when the gas turbine is shut down, the concentration of combustible gas at the exhaust section of the gas turbine is detected, and a gas alarm concentration value is set for two-section alarm;
B. detecting the concentration of combustible gas of the waste heat boiler during shutdown, and setting a gas alarm concentration value as a two-stage alarm;
C. when the concentration of two or more depth detectors in the combustible gas detector group is higher than a certain explosion lower limit output signal; the following operations were carried out: entering triple volume time when the gas alarm concentration is 1-5% LEL; entering five times of volume time when the gas alarm concentration is 6-25% LEL; troubleshooting the fuel system of the gas turbine when the gas warning concentration is greater than 25%LEL;
D. when the gas alarm concentration value is 0, directly entering a starting state or letting an operator select whether to prolong the purging time.
10. The gas turbine elastic purge method of claim 9, wherein, in said step a, said gas turbine exhaust section combustible gas concentration setting two-stage alarm, one stage setting 5%lel, two stage setting 25%lel;
in said step B, the waste heat boiler combustible gas concentration is set to two-stage alarm, one stage is 5% LEL, and two stage is 25% LEL;
in the step C, gas concentration data of the combustible gas detector are extracted, and the control module judges whether an elastic purging signal is sent to the combustion engine or not through a signal obtained by a two-out-of-three redundancy voting program;
purging is carried out when the combustible gas detector detects the concentration of the combustible gas, and purging is not carried out when the concentration of the combustible gas is not detected.
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