CN113982712A - Two-driving-one gas-steam combined cycle unit and steam-releasing method - Google Patents
Two-driving-one gas-steam combined cycle unit and steam-releasing method Download PDFInfo
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- CN113982712A CN113982712A CN202111401781.1A CN202111401781A CN113982712A CN 113982712 A CN113982712 A CN 113982712A CN 202111401781 A CN202111401781 A CN 202111401781A CN 113982712 A CN113982712 A CN 113982712A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/08—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with working fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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Abstract
The application discloses a two-in-one gas-steam combined cycle unit and a steam-releasing method. The two-to-one gas-steam combined cycle unit comprises a target steam-mixing pipeline, a steam-mixing valve and a steam bypass which are arranged on the target steam-mixing pipeline, and a waste heat boiler steam inlet main pipe connected with the target steam-mixing pipeline, wherein the steam bypass is arranged at the upstream of the steam-mixing valve and is in a conducting state; determining the steam pressure in a first pipe of a steam inlet main pipe of the waste heat boiler and the steam pressure in a second pipe at the upstream of a steam combination valve in a target steam combination pipeline; and closing the steam-merging valve under the condition that the steam pressure in the first pipe is greater than that in the second pipe. Because the size between the vapor pressure in the first pipe and the vapor pressure in the second pipe can reflect whether the vapor separation is not finished, the vapor separation valve of the target vapor separation pipeline can be closed under the condition that the vapor pressure in the first pipe is greater than the vapor pressure in the second pipe, and the vapor separation is finished.
Description
Technical Field
The application relates to the technical field of heat engineering, in particular to a two-in-one gas-steam combined cycle unit and a steam release method.
Background
As shown in fig. 1, in the use process of the two-to-one gas-steam combined cycle unit, two parallel gas turbines 11 respectively utilize high-temperature steam generated by gas combustion to do work, so as to convert a part of heat energy in the high-temperature steam into electric energy, and then utilize corresponding steam-merging pipelines 12 to respectively converge steam after the two gas turbines 11 do work to a waste heat boiler steam inlet main pipe 13, so as to utilize the waste heat boiler steam inlet main pipe 13 to convey steam after doing work to a waste heat boiler 14, so that the waste heat boiler 14 can further utilize waste heat in the steam after doing work.
In practical applications, for example, when the power demand changes, it is usually necessary to perform steam stripping so as to close the one steam merging pipe 12. In order to enable the two-in-one gas-steam combined cycle unit to stably run before and after steam stripping, a corresponding steam stripping method needs to be provided.
Disclosure of Invention
The two-in-one gas-steam combined cycle unit and the steam-releasing method provided by the embodiment of the application can be used for solving the problems in the prior art.
The embodiment of the application provides a two-in-one gas-steam combined cycle unit's method of dissolving vapour, two-in-one gas-steam combined cycle unit includes target steam-combining pipeline, set up in the steam-combining valve and the steam bypass of target steam-combining pipeline, and with the female pipe of exhaust-heat boiler admission that target steam-combining pipeline is connected, wherein, the steam bypass set up in the upper reaches of steam-combining valve to be in the on-state, the method includes:
determining the steam pressure in a first pipe of the waste heat boiler steam inlet main pipe and the steam pressure in a second pipe of the target steam combining pipeline, which is positioned at the upstream of the steam combining valve;
and closing the steam merging valve under the condition that the steam pressure in the first pipe is greater than that in the second pipe.
Preferably, the steam bypass is provided with a bypass valve, wherein the opening degree of the bypass valve is adjusted by the difference between the set value and the measured value of the steam pressure in the steam bypass pipe; then, the method further comprises:
the opening degree of the bypass valve is made larger than 0 by setting a set value of the steam pressure in the steam bypass pipe to be an actual measurement value plus a preset negative offset, so that the steam bypass is in a conducting state.
Preferably, a measured value of at least one safety index of the two-driving-one gas-steam combined cycle unit is obtained;
and evaluating the steam-resolving effect according to whether the obtained measured values of all safety indexes are in a standard range.
Preferably, the evaluating the steam-dissolving effect according to whether the obtained measured values of the safety indexes are all within the standard range specifically comprises:
under the condition that the measured values of all safety indexes are within the standard range, the evaluation and steam-dissolving effect is better; or, the evaluation of the steam-dissolving effect is poor under the condition that the measured value of any one or more safety indexes exceeds the standard range.
Preferably, the at least one safety indicator specifically includes any one or more of the following:
a steam turbine load ramp down;
the amount of steam of the operating furnace is changed;
the amount of desuperheating water of the steam bypass is increased;
the amount of fluctuation of the water level of the heater of the heat supply network.
The embodiment of the present application further provides a two-in-one gas-steam combined cycle unit, including:
the system comprises a first gas turbine, a first steam-mixing pipeline connected with a steam outlet of the first gas turbine, a first steam-mixing valve arranged on the first steam-mixing pipeline and a first steam bypass, wherein the first steam bypass is arranged at the upstream of the first steam-mixing valve;
the system comprises a second gas turbine, a second steam-mixing pipeline connected with a steam outlet of the second gas turbine, a second steam-mixing valve arranged on the second steam-mixing pipeline and a second steam bypass, wherein the second steam bypass is arranged at the upstream of the second steam-mixing valve;
the pipeline outlets of the first steam-mixing pipeline and the second steam-mixing pipeline are connected with a steam inlet main pipe of the waste heat boiler;
the pipeline outlet of the steam inlet main pipe of the waste heat boiler is connected with the waste heat boiler; and the number of the first and second groups,
the first steam-stripping device is used for determining the steam pressure in a first pipe of a steam inlet main pipe of the waste heat boiler and the steam pressure in a second pipe upstream of the steam-stripping valve in the target steam-stripping pipeline, and closing the steam-stripping valve of the target steam-stripping pipeline under the condition that the steam pressure in the first pipe is greater than the steam pressure in the second pipe, wherein the target steam-stripping pipeline is specifically the first steam-stripping pipeline or the second steam-stripping pipeline.
Preferably, the two-to-one gas-steam combined cycle unit further includes: and the steam turbine generates electricity by using the steam generated by the waste heat boiler.
Preferably, the steam turbine is provided with a steam outlet, which is connected to a heat network by means of a pipe.
Preferably, the two-to-one gas-steam combined cycle unit further includes: and the steam-removing effect evaluation device is used for acquiring the measured value of at least one safety index of the two-driving-one gas-steam combined cycle unit and evaluating the steam-removing effect according to whether the measured values of the safety indexes are in the standard range.
Preferably, the at least one safety indicator specifically includes any one or more of the following:
a steam turbine load ramp down;
the amount of steam of the operating furnace is changed;
the amount of desuperheating water of the steam bypass is increased;
water level fluctuation of heater of heat supply network
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
by adopting the steam-releasing method provided by the embodiment of the application, the steam pressure in the first pipe of the steam inlet main pipe of the waste heat boiler and the steam pressure in the second pipe at the upstream of the steam-releasing valve in the target steam-releasing pipeline are determined, and whether the steam-releasing is not completed can be reflected due to the size between the steam pressure in the first pipe and the steam pressure in the second pipe, so that the steam-releasing valve of the target steam-releasing pipeline can be closed under the condition that the steam pressure in the first pipe is greater than the steam pressure in the second pipe, and the steam-releasing is completed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a two-in-one gas-steam combined cycle unit in the prior art;
FIG. 2 is a schematic diagram of a specific structure of a two-in-one gas-steam combined cycle plant according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a steam stripping method provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
As shown above, it is generally necessary to perform steam stripping for the two-drive-one gas-steam combined cycle unit, so as to close one steam-combining pipeline, and therefore, in order to enable the two-drive-one gas-steam combined cycle unit to smoothly operate before and after steam stripping, a corresponding steam stripping method needs to be provided.
Based on the above, the embodiment of the application provides a steam-removing method for a two-in-one gas-steam combined cycle unit, which can be used for solving the problems in the prior art.
First, a specific structure of a two-drive-one gas-steam combined cycle unit provided in an embodiment of the present application will be described with reference to fig. 2, where the two-drive-one gas-steam combined cycle unit may include:
the system comprises two gas turbines 21 connected in parallel, wherein each gas turbine 21 is connected with a corresponding steam combining pipeline 22, a corresponding steam combining valve 25 and a steam bypass 26 are arranged in each steam combining pipeline 22, the two steam combining pipelines 22 are connected to a steam inlet main pipe 23 of the waste heat boiler, and a steam outlet of the steam inlet main pipe 23 of the waste heat boiler is connected with a waste heat boiler 24.
For example, one of the two gas turbines 21 connected in parallel may be referred to as a first gas turbine, and the other may be referred to as a second gas turbine; then, the two-drive-one gas-steam combined cycle unit comprises a first gas turbine, a second gas turbine, a steam-combining pipeline (called a first steam-combining pipeline) connected with a steam outlet of the first gas turbine, a steam-combining valve (called a first steam-combining valve) arranged on the first steam-combining pipeline, and a steam bypass (called a first steam bypass), wherein the first steam bypass is arranged at the upstream of the first steam-combining valve, the steam-combining pipeline (called a second steam-combining pipeline) connected with a steam outlet of the second gas turbine, the steam-combining valve (called a second steam-combining valve) arranged on the second steam-combining pipeline, and the steam bypass (called a second steam bypass), and the second steam bypass is arranged at the upstream of the second steam-combining valve; wherein, the upstream and the downstream are determined according to the flow direction of the steam, for example, the steam can flow from the upstream to the downstream; the pipeline outlets of the first steam-mixing pipeline and the second steam-mixing pipeline are connected with a steam inlet main pipe 23 of the waste heat boiler, and the pipeline outlet of the steam inlet main pipe 23 of the waste heat boiler is connected with a waste heat boiler 24.
In the two-drive-one gas-steam combined cycle unit, the gas turbine 21 can utilize high-temperature steam generated during gas combustion to do work, thereby converting a part of heat energy in the high-temperature steam into electric energy. The high-temperature steam (hereinafter referred to as waste heat steam) after working has a relatively low temperature but still contains part of heat energy, and can be conveyed through the connected steam-combining pipe 22 for further utilization. For example, the exhaust-heat steam can be conveyed to the exhaust-heat boiler steam inlet main pipe 23 through the steam-mixing pipeline 22, and then the exhaust-heat steam is further conveyed to the exhaust-heat boiler 24 through the exhaust-heat boiler steam inlet main pipe 23, and the exhaust-heat in the exhaust-heat steam is recycled through the exhaust-heat boiler 27, so that the energy-saving effect is achieved; of course, the waste heat steam may be delivered to other devices through the waste heat steam bypass 26 provided in the steam merging pipeline 22 for waste heat utilization.
Of course, the two-to-one gas-steam combined cycle plant may further include a steam turbine 27, and the steam turbine 27 may generate electricity using the steam generated by the waste heat boiler 24. In practice, the exhaust-heat boiler 24 generally uses the waste heat of the exhaust-heat steam to produce steam, and the steam can be transported to the steam turbine 27 through a pipeline, so that the steam turbine 27 can generate electricity by using the steam.
In addition, the two-in-one gas-steam combined cycle unit may further include a heat supply network 28, and a steam inlet of the heat supply network 28 is connected to a steam outlet of the steam turbine 27 through a pipe, so that steam is introduced from the steam turbine 27 into the heat supply network 28 to be heated, and further, waste heat is utilized.
The opening degree of the steam-combining valve 25 provided in the steam-combining pipe 22 can be controlled, so that the on/off of the steam-combining pipe 22 and the magnitude of the flow rate of the waste heat steam can be controlled. For the specific type of the merging valve 25, it may be a general electrically-controlled valve, so that the opening degree of the electrically-controlled valve is electrically controlled by a remote; of course, the steam combining valve 25 may be a manual valve, so that the opening degree of the valve is manually controlled by a worker.
Each parallel steam pipeline 22 is further provided with a steam bypass 26, and steam in the corresponding parallel steam pipeline 22 can be led out through the steam bypass 26, so that waste heat steam can be led out through the steam bypass 26 in the steam stripping process and after the steam stripping is completed, and the influence of the stripping on the gas turbine 21 is reduced.
In practical applications, a bypass valve 261 may be further disposed on the steam bypass 26, so that the opening degree of the bypass valve 261 can be controlled to control the conduction and the stop of the steam bypass 26 and the magnitude of the waste heat steam flow.
The bypass valve 261 may be an electrically controlled valve or a manually controlled valve, and an electrically controlled valve may be selected as the bypass valve 261 to facilitate remote control of the opening degree of the bypass valve 261.
For example, when the bypass valve 261 is an electrically controlled valve, a PID controller (proportional-integral-derivative controller) may be used to control the opening degree of the bypass valve 261. For example, in practical applications, the opening of the bypass valve 261 can be controlled by using the pressure of the vapor in the pipe of the vapor bypass 26 as a basis, and particularly, in specific applications, a set value is preset for the pressure of the vapor in the pipe of the vapor bypass 26, an actual measurement value of the pressure of the vapor in the pipe of the vapor bypass 26 is obtained by a real-time monitoring method, and a difference between the set value and the actual measurement value is obtained and input to the PID controller, so that the PID controller can increase or decrease the opening of the bypass valve 261 by using the positive, negative, magnitude, etc. of the difference. For example, when the difference between the set value and the measured value is negative, it means that the set value is smaller than the measured value, and the opening degree of the bypass valve 261 needs to be increased, and at this time, the PID controller may control the opening degree of the bypass valve 261 to be increased according to the difference; alternatively, when the difference between the set value and the measured value is positive, which means that the set value is greater than the measured value, the PID controller may control to decrease the opening degree of the bypass valve 261 according to the difference.
The above is a description of a specific structure of a two-drive-one gas-steam combined cycle unit provided in an embodiment of the present application, and based on the two-drive-one gas-steam combined cycle unit, the embodiment of the present application may further provide a steam-stripping method, and as shown in fig. 3, the specific flow diagram of the steam-stripping method is provided, and the steam-stripping method includes the following steps:
step S1: and selecting a target steam-mixing pipeline.
Referring to fig. 2, the two-in-one gas-steam combined cycle unit includes two gas turbines 21 connected in parallel, each gas turbine 21 is connected to a corresponding steam-combining pipe 22, a corresponding steam-combining valve 25 and a steam bypass 26 are respectively disposed in each steam-combining pipe 22, both steam-combining pipes 22 are connected to a waste heat boiler steam inlet main pipe 23, and a steam outlet of the waste heat boiler steam inlet main pipe 23 is connected to a waste heat boiler 24.
It should be noted that the target steam-merging pipe selected in step S1 may be any one of the two steam-merging pipes 22, that is, any one of the two steam-merging pipes 22 may be randomly selected as the target steam-merging pipe; of course, a certain designated steam-merging pipe 22 may also be selected as the target steam-merging pipe according to the actual demand, so as to perform steam-resolving on the target steam-merging pipe, and finally close the steam-merging valve on the target steam-merging pipe.
Step S2: and inputting the difference value between the set value and the measured value of the steam pressure in the steam bypass pipe of the target steam-merging pipe into the PID controller, and controlling the bypass valve to increase the opening degree through the PID controller, wherein the set value of the steam pressure in the steam bypass pipe is set as the measured value plus a preset negative offset.
In step 2, since the set value of the steam pressure in the steam bypass pipe is set to the actual measurement value plus the predetermined negative offset amount, the difference between the set value and the actual measurement value is the predetermined negative offset amount, and since the predetermined negative offset amount is a negative value, the predetermined negative offset amount is input to the PID controller, and the opening of the bypass valve can be controlled by the PID controller to be continuously increased.
The predetermined negative bias may be selected from a value greater than or equal to-0.5 MPa and less than 0 as the predetermined negative bias, for example, the predetermined negative bias is-0.5 MPa, -0.45MPa, -0.4MPa, -0.35MPa, -0.3MPa, -0.25MPa, -0.2MPa, -0.15MPa, -0.1MPa, -0.05MPa, or the like, or may be a value between-0.5 MPa and 0 MPa.
In the above step S1 and step S2, the PID controller continuously controls the bypass valve to increase the opening degree, so that the steam bypass of the target steam-merging pipeline is always in a conducting state, and the flow rate of the waste heat steam of the steam bypass is continuously increased along with the continuous increase of the opening degree of the bypass valve, so that the steam in the target steam-merging pipeline is continuously led out, and the flow rate of the waste heat steam entering the steam inlet main pipe of the waste heat boiler through the target steam-merging pipeline is continuously reduced, so that the steam can be desorbed. And finally, when certain closing conditions are met, the steam-mixing valve on the target steam-mixing pipeline can be closed. The closing condition may be, for example, that the flow rate of the exhaust-heat steam entering the steam inlet main pipe of the exhaust-heat boiler is small enough, or other similar conditions capable of reflecting the smooth operation of the two-drive-one gas-steam combined cycle unit before and after steam stripping.
For example, when the steam pressure in the pipe (called as the first pipe steam pressure) of the steam inlet main pipe of the waste heat boiler is smaller than the steam pressure in the pipe (called as the second pipe steam pressure) at the upstream of the steam merging valve in the target steam merging pipeline, it is indicated that more waste heat steam exists in the target steam merging pipeline, and steam is not completely decomposed, and at this time, if the steam merging valve is closed, the steam can not stably run before and after steam is decomposed; and when the steam pressure in the first pipe is higher than that in the second pipe, the steam release is finished, and at the moment, even if the steam valve is closed, the two-driving-one gas-steam combined cycle unit can still stably run. The size between the steam pressure in the first pipe and the steam pressure in the second pipe can reflect whether the steam separation is not finished, so that the size comparison between the first pipe and the second pipe can be used as the closing condition, and the steam mixing valve of the target steam mixing pipeline can be closed to finish the steam separation under the condition that the steam pressure in the first pipe is greater than the steam pressure in the second pipe.
Therefore, the steam-stripping method provided by the embodiment of the application may further include the following steps S3 and S4.
Step S3: and determining the steam pressure in a first pipe of a steam inlet main pipe of the waste heat boiler and the steam pressure in a second pipe at the upstream of a steam combination valve in a target steam combination pipeline.
For a specific way of determining the steam pressure in the first pipe and the steam pressure in the second pipe, for example, pressure detection devices may be disposed in the steam inlet main pipe and the target steam-merging pipe of the waste heat boiler, so as to measure the steam pressure in the first pipe and the steam pressure in the second pipe respectively.
Step S4: and closing the steam-combining valve in the target steam-combining pipeline under the condition that the steam pressure in the first pipe is greater than that in the second pipe.
In practical applications, other closing conditions may also be set for the steam-merging valve of the target steam-merging pipeline, for example, a threshold may be preset for a bypass valve of a steam bypass of the target steam-merging pipeline, and in the steam-merging process, the steam-merging valve in the target steam-merging pipeline is closed as the opening degree of the bypass valve gradually increases to the threshold. Compared with the closing conditions obtained by comparing the steam pressure in the first pipe with the steam pressure in the second pipe in the steps S3 and S4, the closing conditions for setting the threshold value are generally difficult to accurately grasp, so that the problem of insufficient steam release is easily caused, and further, the operation of the two-to-one gas-steam combined cycle unit before and after steam release may be unstable.
After the steam-mixing valve in the target steam-mixing pipeline is closed in step S4, the steam-mixing effect may be further evaluated, for example, an actual measurement value of at least one safety index of the two-drive-one gas-steam combined cycle unit may be obtained, and then the steam-mixing effect may be evaluated according to whether the actual measurement values of the safety indexes are all within a standard range. For example, under the condition that the measured values of all safety indexes are within the standard range, the evaluation steam-dissolving effect is better; or, the evaluation of the steam-dissolving effect is poor under the condition that the measured value of any one or more safety indexes exceeds the standard range.
Wherein, according to the actual situation, the at least one safety index may specifically include any one or more of the following: the load sudden drop amount of the steam turbine, the steam quantity variation amount of the operating furnace, the temperature reduction water quantity increase amount of a steam bypass of a target steam-merging pipeline and the heater water level fluctuation amount of a heat supply network.
For example, the measured values of the sudden load drop of the steam turbine and the steam quantity variation of the operating furnace can be obtained, so that whether the measured values of the two safety indexes exceed the standard range or not is judged, if both the measured values exceed the standard range, the steam-resolving effect is better, and the two-drive-one gas-steam combined cycle unit can stably operate before and after resolving steam; on the contrary, when one or two safety indexes exceed the standard range, the steam-releasing effect is poor, and the two-driving-one gas-steam combined cycle unit can not run stably.
It should be noted that, in practical applications, the standard ranges of different safety indexes are usually different, for example, the standard range of the load sudden drop amount of the steam turbine is usually 5MW, the standard range of the steam amount variation of the operating furnace is usually 20t/h, the standard range of the amount increase of the attemperation water amount of the steam bypass of the target steam-merging pipeline is usually 2t/h, and the standard range of the heater water level fluctuation amount of the heat supply network is usually 50 mm.
Based on the same inventive concept as the steam-dissolving method provided by the embodiment of the application, a steam-dissolving device can be correspondingly added in the two-dragging-one gas-steam combined cycle unit to perform steam dissolving, and for specific description of each steam-dissolving device, if the specific description is unclear, reference can be made to other parts of the description.
For example, a first steam release device may be additionally arranged in the two-to-one gas-steam combined cycle unit provided in the embodiment of the present application, and is configured to determine a steam pressure in a first pipe of a steam inlet main pipe of the waste heat boiler and a steam pressure in a second pipe of the target steam-combining pipe, where the second pipe is located upstream of the steam-combining valve, and close the steam-combining valve of the target steam-combining pipe when the steam pressure in the first pipe is greater than the steam pressure in the second pipe.
In addition, after the steam-mixing valve of the target steam-mixing pipeline is finally closed through the first steam-mixing device, in order to evaluate the steam-mixing effect, a steam-mixing effect evaluation device can be additionally arranged in the two-in-one gas-steam combined cycle unit and used for obtaining the measured value of at least one safety index of the two-in-one gas-steam combined cycle unit and evaluating the steam-mixing effect according to whether the obtained measured values of all safety indexes are in the standard range.
For example, a second steam-dissolving device may be further added to the two-drive-one gas-steam combined cycle unit provided in the embodiment of the present application, and configured to input a difference between a set value and an actual value of the steam pressure in the steam bypass pipe to the PID controller, and control the bypass valve of the target steam-merging pipe to increase the opening degree through the PID controller, so as to perform steam dissolving, where the set value of the steam pressure in the steam bypass pipe is set as the actual value plus the preset negative offset.
Wherein, the value range of the preset negative offset is more than or equal to-0.5 MPa and less than 0.
The bypass valve of the target steam combining line may specifically comprise an electrically controlled valve or a manually controlled valve.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A steam-removing method of a two-in-one gas-steam combined cycle unit is characterized in that the two-in-one gas-steam combined cycle unit comprises a target steam-combining pipeline, a steam-combining valve and a steam bypass which are arranged on the target steam-combining pipeline, and a waste heat boiler steam inlet main pipe connected with the target steam-combining pipeline, wherein the steam bypass is arranged at the upstream of the steam-combining valve and is in a conducting state, and the method comprises the following steps:
determining the steam pressure in a first pipe of the waste heat boiler steam inlet main pipe and the steam pressure in a second pipe of the target steam combining pipeline, which is positioned at the upstream of the steam combining valve;
and closing the steam merging valve under the condition that the steam pressure in the first pipe is greater than that in the second pipe.
2. The steam stripping method as claimed in claim 1, characterized in that the steam bypass is provided with a bypass valve, wherein the opening degree of the bypass valve is adjusted by the difference between the set value and the measured value of the steam pressure in the steam bypass pipe; then, the method further comprises:
the opening degree of the bypass valve is made larger than 0 by setting a set value of the steam pressure in the steam bypass pipe to be an actual measurement value plus a preset negative offset, so that the steam bypass is in a conducting state.
3. The method of de-steaming as claimed in claim 1, further comprising:
acquiring a measured value of at least one safety index of the two-driving-one gas-steam combined cycle unit;
and evaluating the steam-resolving effect according to whether the obtained measured values of all safety indexes are in a standard range.
4. The steam resolving method of claim 3, wherein evaluating the steam resolving effect according to whether the obtained measured values of the safety indexes are all within a standard range specifically comprises:
under the condition that the measured values of all safety indexes are within the standard range, the evaluation and steam-dissolving effect is better; or, the evaluation of the steam-dissolving effect is poor under the condition that the measured value of any one or more safety indexes exceeds the standard range.
5. The steam-stripping method as claimed in claim 3, wherein the at least one safety index specifically includes any one or more of the following:
a steam turbine load ramp down;
the amount of steam of the operating furnace is changed;
the amount of desuperheating water of the steam bypass is increased;
the amount of fluctuation of the water level of the heater of the heat supply network.
6. A two-for-one gas-steam combined cycle unit, comprising:
the system comprises a first gas turbine, a first steam-mixing pipeline connected with a steam outlet of the first gas turbine, a first steam-mixing valve arranged on the first steam-mixing pipeline and a first steam bypass, wherein the first steam bypass is arranged at the upstream of the first steam-mixing valve;
the system comprises a second gas turbine, a second steam-mixing pipeline connected with a steam outlet of the second gas turbine, a second steam-mixing valve arranged on the second steam-mixing pipeline and a second steam bypass, wherein the second steam bypass is arranged at the upstream of the second steam-mixing valve;
the pipeline outlets of the first steam-mixing pipeline and the second steam-mixing pipeline are connected with a steam inlet main pipe of the waste heat boiler;
the pipeline outlet of the steam inlet main pipe of the waste heat boiler is connected with the waste heat boiler; and the number of the first and second groups,
the first steam-stripping device is used for determining the steam pressure in a first pipe of a steam inlet main pipe of the waste heat boiler and the steam pressure in a second pipe upstream of the steam-stripping valve in the target steam-stripping pipeline, and closing the steam-stripping valve of the target steam-stripping pipeline under the condition that the steam pressure in the first pipe is greater than the steam pressure in the second pipe, wherein the target steam-stripping pipeline is specifically the first steam-stripping pipeline or the second steam-stripping pipeline.
7. The two-drive-one gas-steam combined cycle unit of claim 6, further comprising: and the steam turbine generates electricity by using the steam generated by the waste heat boiler.
8. A two-over-one gas-steam combined cycle plant according to claim 7, wherein the steam turbine is provided with a steam outlet which is connected to a heat network by a pipe.
9. The two-drive-one gas-steam combined cycle unit of claim 6, further comprising: and the steam-removing effect evaluation device is used for acquiring the measured value of at least one safety index of the two-driving-one gas-steam combined cycle unit and evaluating the steam-removing effect according to whether the measured values of the safety indexes are in the standard range.
10. A two-in-one gas-steam combined cycle plant according to claim 9, wherein the at least one safety indicator specifically comprises any one or more of the following:
a steam turbine load ramp down;
the amount of steam of the operating furnace is changed;
the amount of desuperheating water of the steam bypass is increased;
the amount of fluctuation of the water level of the heater of the heat supply network.
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