CN104696940A - High-pressure steam system for two-pull-one unit of fuel gas thermal power plant and start-stop control method of high-pressure steam system - Google Patents
High-pressure steam system for two-pull-one unit of fuel gas thermal power plant and start-stop control method of high-pressure steam system Download PDFInfo
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Abstract
The invention relates to a high-pressure steam system for a two-pull-one unit of a fuel gas thermal power plant and a start-stop control method of the high-pressure steam system. The high-pressure steam system comprises a first high-pressure steam system, a second high-pressure steam system and a steam turbine high-pressure cylinder, wherein the first high-pressure steam system comprises a first high-pressure steam pipeline, a first high-pressure steam converging electric door, a first high-pressure steam converging bypass electric door, a first high-pressure bypass control valve, a first high side temperature-reducing water pipeline, a first high side temperature-reducing water regulating valve and a first high side temperature-reducing water electric valve; the second high-pressure steam system comprises a second high-pressure steam pipeline, a second high-pressure steam converging electric door, a second high-pressure steam converging bypass electric door, a second high-pressure bypass control valve, a second high side temperature-reducing water pipeline, a second high side temperature-reducing water regulating valve and a second high side temperature-reducing water electric valve. According to the invention, automatic investment can be realized in the steam withdrawing state of the medium-pressure steam system on the side; in the investment state, automatic steam withdrawing or automatic steam converging of the medium-pressure steam system on the side is realized.
Description
Technical field
The invention relates to gas power station high steam technology, particularly drag a unit high pressure steam system and on off control method thereof about a kind of gas power station two.
Background technology
The major function of gas power station high pressure steam system is that conducting waste heat boiler HP steam drum carrys out vapour and goes steam turbine high-pressure cylinder to do work, but existing gas power station high pressure steam system cannot when steam turbine trips, play the effect of pressure release high steam, cannot balance and pressure reduction before and after vapour Electrically operated gate, middle pressure drum reheater cannot be removed by isolated high-voltage cylinder steam discharge.In addition, existing gas power station high pressure steam system under this side high pressure steam system exit status, cannot realize the automatic input of this side high pressure steam system; Under input state, automatically exiting of this side high pressure steam system cannot be realized; And under opposite side high pressure steam system input state, the automatic of this side high pressure steam system cannot be realized and vapour.
Summary of the invention
Embodiments provide a kind of gas power station two and drag a unit high pressure steam system and on off control method thereof, with under this side high pressure steam system exit status, realize the automatic input of this side high pressure steam system; Under input state, realize automatically exiting of this side high pressure steam system; Under opposite side high pressure steam system input state, realize the automatic of this side high pressure steam system and vapour.
To achieve these goals, embodiments provide a kind of gas power station two and drag a unit high pressure steam system, described gas power station two drags a unit high pressure steam system to comprise: the first high pressure steam system, the second high pressure steam system and steam turbine high-pressure cylinder;
First high pressure steam system comprises: the first high steam pipeline, the first high steam vapour Electrically operated gate, the first high steam vapour bypass Electrically operated gate, the first high pressure turbine by control valve, the first Desuperheating device, the first high other desuperheating water pipeline, the first high other desuperheating water adjust valve and the first high other desuperheating water motor-driven valve;
Second high pressure steam system comprises: the second high steam pipeline, the second high steam vapour Electrically operated gate, the second high steam vapour bypass Electrically operated gate, the second high pressure turbine by control valve, the second high other desuperheating water pipeline, the second high other desuperheating water adjust valve and the second high other desuperheating water motor-driven valve;
Described first high steam vapour Electrically operated gate is arranged on the first high steam pipeline, the first high steam the two ends of vapour bypass Electrically operated gate are connected to the first high steam and the two ends of vapour Electrically operated gate; Described first high steam pipeline one end connects steam turbine high-pressure cylinder, and the other end receives from the first waste heat boiler high steam; One end of described first high other desuperheating water pipeline is connected to described first high steam by described first Desuperheating device and the first high pressure turbine by control valve and on described first high steam pipeline between vapour Electrically operated gate and the first waste heat pot, the other end connects the first feed pump;
Described second high steam vapour Electrically operated gate is arranged on described second high steam pipeline, described second high steam the two ends of vapour bypass Electrically operated gate are connected to the two ends of described second high steam vapour Electrically operated gate; Described second high steam pipeline one end connects steam turbine high-pressure cylinder, and the other end receives from the second waste heat boiler high steam; One end of described second high other desuperheating water pipeline is connected to described second high steam by described second high pressure turbine by control valve and on the second high steam pipeline between vapour Electrically operated gate and the second waste heat pot, the other end connects the second feed pump.
In one embodiment, water one tunnel of the tap of described first feed pump adjusts valve, the first Desuperheating device and the first high pressure turbine by control valve to enter the first high steam pipeline through the first high other desuperheating water motor-driven valve, the first high other desuperheating water successively; Valve, the first Desuperheating device are adjusted through the first high other desuperheating water motor-driven valve, the first high other desuperheating water successively in another road, then go reheater pipeline to enter in the first waste heat boiler by first and press reheater pipeline.
In one embodiment, water one tunnel of the tap of described second feed pump adjusts valve, the second Desuperheating device and the second high pressure turbine by control valve to enter the second high steam pipeline through the second high other desuperheating water motor-driven valve, the second high other desuperheating water successively; Valve, the second Desuperheating device are adjusted through the second high other desuperheating water motor-driven valve, the second high other desuperheating water successively in another road, then go reheater pipeline to enter in the second waste heat boiler by second and press reheater pipeline.
In one embodiment, described gas power station two drags in a unit high pressure steam system and is also provided with: the first high pressure steam system programed logic action button and the second high pressure steam system programed logic action button.
To achieve these goals, the invention provides a kind of on off control method, described on off control method comprises:
Judge whether the first high pressure steam system has dropped into automatic position;
If the first high pressure steam system has dropped into automatic position, judged whether to meet first condition, second condition and Article 3 part simultaneously; If asynchronously meet first condition, second condition and Article 3 part, send out the first waste heat boiler reheater entrance Electrically operated gate and throw and highly drain into the automatic instruction of the first waste heat boiler reheater adjustment doors; Wherein,
First condition is:
1. the second high pressure steam system is program control does not drop into and the second waste heat boiler steam vapour Electrically operated gate and the second waste heat boiler steam vapour bypass Electrically operated gate are closed;
Or 2. the second high steam vapour Electrically operated gate are opened, and the second waste heat boiler high pressure main steam flow predetermined percentage and the second waste heat boiler run, and the first high pressure main steam and before and after vapour motor-driven valve steam differential pressure be greater than the first predetermined pressure, and the first waste heat boiler runs;
Or 3. the first high steam vapour Electrically operated gate are opened;
Second condition is: the first waste heat boiler reheater entrance Electrically operated gate is opened;
Article 3 part is: the first waste heat boiler reheater entrance adjustment doors is thrown automatically;
If meet described first condition, second condition and Article 3 part simultaneously, judge the first waste heat boiler main steam pressure and the second waste heat boiler steam and after vapour Electrically operated gate, whether pressure difference value is greater than the second predetermined pressure;
If so, judge whether to meet Article 4 part and Article 5 part simultaneously, or whether meet Article 6 part; If not, the first main steam is sent out and the instruction of vapour bypass Electrically operated gate; Wherein,
Article 4 part is: the first boiler main steam by-pass Electrically operated gate is opened;
Article 5 part is: 1.: meet a, the second waste heat boiler runs; And predetermined percentage described in the second high steam load; And the second high steam vapour Electrically operated gate are opened; And the first main steam temperature is greater than predetermined temperature; And the quality of the first high steam confirms; And the first high pressure turbine by drops into remote control mode; And the first high steam and before and after vapour Electrically operated gate steam differential pressure be greater than the 3rd predetermined pressure; And meet b, the second high pressure turbine by automatic steam control valve opening is less than the first predetermined aperture and steam turbine power generation power is greater than predetermined ratio or the steam turbine trip of rated power;
Or 2. before and after the first high steam Electrically operated gate differential pressure be greater than described second predetermined pressure or the first main steam and vapour bypass Electrically operated gate is opened, and the second boiler main steam vapour Electrically operated gate are closed;
Or 3. steam turbine trip;
Article 6 part is: the first main steam vapour Electrically operated gate are opened;
Judge the first high steam and whether vapour Electrically operated gate is opened; If the first high steam vapour Electrically operated gate are not opened, send out the first high steam and the instruction of vapour Electrically operated gate;
If the first high steam vapour Electrically operated gate are opened, judge the first high steam and whether vapour bypass Electrically operated gate closes, if the first high steam vapour bypass Electrically operated gate are not closed, send pass first high steam and the instruction of vapour bypass Electrically operated gate.
In one embodiment, described on off control method also comprises:
Judge whether that the first waste heat boiler moves back, or the first high lateral pressure control valve is in automatic position;
If the first waste heat boiler moves back, or the first high lateral pressure control valve is in automatic position, judges whether that the first waste heat boiler is out of service; Or first high steam vapour Electrically operated gate close; Or the left and right high-pressure main throttle valve of steam turbine is closed; Or second waste heat boiler reheating main steam vapour Electrically operated gate open and the second main steam flow be greater than described predetermined percentage and the second waste heat boiler in operation;
Judge whether the first high steam bypass pressure control valve aperture is greater than the second predetermined aperture, if the first high steam bypass pressure control valve aperture is not more than the second predetermined aperture, send out the instruction of the first high steam bypass pressure control valve to target aperture;
If the first high steam bypass pressure control valve aperture is greater than the second predetermined aperture, judge whether the first high steam and vapour Electrically operated gate has been closed and the first high steam bypass vapour Electrically operated gate are closed; And the first stove reheater entrance adjustment doors has been closed and has been opened in manual position or the first stove reheater entrance adjustment doors and the second reheater entrance adjustment doors pass;
If not, send closedown first high steam and vapour Electrically operated gate and close the first high steam vapour bypass Electrically operated gate, and close the first reheater entrance adjustment doors and be switched to manual instruction.
In one embodiment, described predetermined percentage is 60%.
In one embodiment, described first predetermined pressure is-2MPa.
In one embodiment, described second predetermined pressure is-0.4MPa.
In one embodiment, described predetermined temperature is 390 DEG C.
In one embodiment, described 3rd predetermined pressure is 0MPa.
In one embodiment, described first predetermined aperture is 2%.
In one embodiment, described second predetermined aperture is 27%.
The beneficial effect of the embodiment of the present invention is, by the present invention, under this side high pressure steam system exit status, can realize the automatic input of this side high pressure steam system; Under input state, realize automatically exiting of this side high pressure steam system; Under opposite side high pressure steam system input state, realize the automatic of this side high pressure steam system and vapour.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation that the gas power station two of the embodiment of the present invention drags a unit high pressure steam system;
Fig. 2 is the on off control method flow diagram of one embodiment of the invention;
Fig. 3 is the on off control method flow diagram of another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of gas power station two to drag a unit high pressure steam system, as shown in Figure 1, this gas power station two drags a unit high pressure steam system to comprise: #1 high pressure steam system, #2 high pressure steam system and steam turbine high-pressure cylinder 21, #1 high pressure steam system is connected to steam turbine high-pressure cylinder 21, #2 high pressure steam system by #1 high steam pipeline 18 and is connected to steam turbine high-pressure cylinder 21 by #2 high steam pipeline 22.
#1 high pressure steam system comprises: #1 high steam pipeline 18, #1 high steam vapour Electrically operated gate 4, #1 high steam the other desuperheating water pipeline 19 of vapour bypass Electrically operated gate 5, high pressure turbine by control valve 1, Desuperheating device 20, #1 height, the other desuperheating water of #1 height adjust valve 2 and the other desuperheating water motor-driven valve 3 of #1 height.
#1 high steam pipeline 18 one end connects steam turbine high-pressure cylinder 21, and the other end receives from #1 waste heat boiler high steam; #1 high steam vapour Electrically operated gate 4 is arranged on #1 high steam pipeline 18, #1 high steam the two ends of vapour bypass Electrically operated gate 5 are connected to #1 high steam and the two ends of vapour Electrically operated gate 4; One end of the other desuperheating water pipeline 19 of #1 height is connected to #1 high steam by Desuperheating device 20 and high pressure turbine by control valve 1 and on #1 high steam pipeline 18 between vapour Electrically operated gate 4 and #1 waste heat pot, the other end connects feed pump.High pressure turbine by control valve 1 is for decompression, and the effect of Desuperheating device 20 is desuperheats, and high pressure turbine by control valve 1 and Desuperheating device 20 integrally, are called reducing-and-cooling plant.In addition, Desuperheating device 20 goes reheater pipeline 22 to be connected in 1# waste heat boiler by first and presses reheater pipeline 23.
Water one tunnel of feed pump tap adjusts valve 2, Desuperheating device 20 and high pressure turbine by control valve 1 to enter #1 high steam pipeline 12 through the other desuperheating water motor-driven valve 3 of #1 height, the other desuperheating water of #1 height successively; Valve 2, Desuperheating device 20 are adjusted through the other desuperheating water motor-driven valve 3 of #1 height, the other desuperheating water of #1 height successively in another road, then go reheater pipeline 22 to enter in 1# waste heat boiler through first and press reheater pipeline 23.
#2 high pressure steam system comprises: #2 high steam pipeline 24, #2 high steam vapour Electrically operated gate 11, #2 high steam the other desuperheating water pipeline 26 of vapour bypass Electrically operated gate 12, high pressure turbine by control valve 8, Desuperheating device 25, #2 height, the other desuperheating water of #2 height adjust valve 9 and the other desuperheating water motor-driven valve 10 of #2 height.
#2 high steam pipeline 24 one end connects steam turbine high-pressure cylinder 21, and the other end receives from #2 waste heat boiler high steam; #2 high steam vapour Electrically operated gate 11 is arranged on #2 high steam pipeline 24, #2 high steam the two ends of vapour bypass Electrically operated gate 12 are connected to #2 high steam and the two ends of vapour Electrically operated gate 11; One end of the other desuperheating water pipeline 26 of #2 height is connected to #2 high steam by Desuperheating device 25 and high pressure turbine by control valve 8 and on #2 high steam pipeline 24 between vapour Electrically operated gate 11 and #2 waste heat pot, the other end connects feed pump.Desuperheating device 25 is connected to condenser by condenser branch road 19.Desuperheating device 25 goes reheater pipeline 27 to be connected in 2# waste heat boiler by second and presses reheater pipeline 28.
Water one tunnel of feed pump tap adjusts valve 9, Desuperheating device 25 and high pressure turbine by control valve 8 to enter #2 high steam pipeline 24 through the other desuperheating water motor-driven valve 10 of #2 height, the other desuperheating water of #2 height successively; Valve 9, Desuperheating device 25 are adjusted through the other desuperheating water motor-driven valve 10 of #2 height, the other desuperheating water of #1 height successively in another road, then go reheater pipeline 27 to enter in 1# waste heat boiler through second and press reheater pipeline 28.
Gas power station two of the present invention drags in a unit high pressure steam system and is also provided with four artificial action buttons: #1 high pressure steam system programed logic action button a1, #1 high steam quality ACK button a2, #2 high pressure steam system programed logic action button a3 and #2 high steam quality ACK button a4.
Gas power station two of the present invention drags a unit high pressure steam system except by except above-mentioned high steam pipeline, valve, also comprises relevant thermal technology's measuring point (as the multiple pressure-measuring-point in figure and temperature point).High steam pipeline (comprising #1 high steam pipeline 18 and #2 high steam pipeline 24) is the connecting pipe between waste heat boiler HP steam drum and steam turbine high-pressure cylinder 21, plays the effect of transport high steam.The effect of high steam vapour Electrically operated gate (#1 high steam vapour Electrically operated gate 4 and #2 high steam vapour Electrically operated gate 11) is that isolation waste heat boiler high steam removes steam turbine high-pressure cylinder.The effect of high steam vapour bypass Electrically operated gate (#1 high steam vapour bypass Electrically operated gate 5 and #2 high steam vapour bypass Electrically operated gate 12) is balance and pressure reduction before and after vapour Electrically operated gate.The effect of high pressure turbine by Steam pressure control valve (#1 high lateral pressure control valve 1 and #2 high lateral pressure control valve 6) regulates High Pressure Steam Host Piping pressure, high steam parameter is controlled by this pressure-control valve before steam turbine high-pressure cylinder admission, when steam turbine trips, this pressure-control valve can also play the effect of pressure release high steam.Waste heat boiler reheater entrance Electrically operated gate (#1 reheater entrance Electrically operated gate 7 and #2 reheater entrance Electrically operated gate 14) effect is that isolation steam turbine high-pressure cylinder steam discharge removes middle pressure drum reheater; Waste heat boiler reheater entrance adjustment doors (#1 reheater entrance adjustment doors 7 and #2 reheater entrance adjustment doors 14) regulates high pressure cylinder exhaust steam flow.The overheated main steam of HP steam drum is through high steam and vapour Electrically operated gate (#1 high steam vapour Electrically operated gate 4 and #2 high steam vapour Electrically operated gate 11), high-pressure main throttle valve enter steam turbine high-pressure cylinder acting; High pressure cylinder steam discharge, through reheater entrance adjustment doors adjustment flow, enters middle pressure drum reheater through reheater entrance Electrically operated gate and is heated.
The embodiment of the present invention provides a kind of on off control method, and be applied to the gas power station two shown in Fig. 1 and drag a unit high pressure steam system, this on off control method comprises: setting up procedure, and as shown in Figure 2, this setting up procedure comprises:
S201: judge whether the first high pressure steam system has dropped into automatic position; If the first high pressure steam system has dropped into automatic position, enter S202.
S202: judge whether to meet first condition, second condition and Article 3 part simultaneously, if meet first condition, second condition and Article 3 part simultaneously, carry out S204; Otherwise, carry out S203, send out the first waste heat boiler reheater entrance Electrically operated gate and throw and highly drain into the automatic instruction of the first waste heat boiler reheater adjustment doors.
Wherein, first condition is:
1. the second high pressure steam system is program control does not drop into and the second waste heat boiler steam vapour Electrically operated gate and the second waste heat boiler steam vapour bypass Electrically operated gate are closed;
Or 2. #2 high steam vapour Electrically operated gate opened and #2 waste heat boiler high pressure main steam flow be greater than predetermined percentage (in an embodiment, this predetermined percentage is 60%) and #2 waste heat boiler run and #1 high pressure main steam and before and after vapour motor-driven valve steam differential pressure be greater than the first predetermined pressure (in an embodiment, this first predetermined pressure is-2MPa) and #1 waste heat boiler runs;
Or 3. #1 high steam vapour Electrically operated gate are opened.
Second condition is: the first waste heat boiler reheater entrance Electrically operated gate is opened;
Article 3 part is: the first waste heat boiler reheater entrance adjustment doors is thrown automatically.
It should be noted that, the first waste heat boiler is the Electrically operated gate be connected with the first high pressure steam system, and the second waste heat boiler is the Electrically operated gate be connected with the second high pressure steam system.First, second in description is not intended to limit sequencing and actual numbering, and such as the first high pressure steam system is not #1 high pressure steam system, and also can represent the second high-pressure system, namely first can be #1, also can be #2.In the present embodiment, for convenience of description, represent #1 with first, second represents #2.
S204: judge the first waste heat boiler main steam pressure and the second waste heat boiler steam and after vapour Electrically operated gate, whether pressure difference value is greater than the second predetermined pressure (-0.4MPa), if the first waste heat boiler main steam pressure and the second waste heat boiler steam and after vapour Electrically operated gate pressure difference value be greater than-0.4MPa, carry out S205.
S205: judge whether to meet Article 4 part and Article 5 part simultaneously, or judge whether to meet Article 6 part.
If meet Article 4 part and Article 5 part simultaneously, or judge whether to meet Article 6 part, carry out S207; Otherwise, carry out S206, send out the first main steam and the instruction of vapour bypass Electrically operated gate.
Wherein, Article 4 part is: the first boiler main steam by-pass Electrically operated gate is opened.
Article 5 part is: 1. #2 waste heat boiler runs; And #2 high steam load >60%; And #2 high steam vapour Electrically operated gate are opened; And #1 main steam temperature is greater than predetermined temperature (being such as 390 DEG C); And #1 high steam quality confirms; And #1 high pressure turbine by drops into remote control mode; And steam differential pressure is greater than the 3rd predetermined pressure (being such as 0MPa) before and after #1 high steam Electrically operated gate; And (#2 high pressure turbine by automatic steam control valve opening is less than predetermined aperture (being such as 2%) and steam turbine power generation power is greater than 10% rated power) or steam turbine trip) }; Or 2. { (before and after #1 high steam Electrically operated gate differential pressure be greater than-0.4MPa or #1 main steam and vapour bypass Electrically operated gate is opened) and #2 boiler main steam vapour Electrically operated gate close }; Or 3. steam turbine trip.
Article 6 part is: the first main steam vapour Electrically operated gate are opened.
S207: judge the first high steam and whether vapour Electrically operated gate is opened.If the first high steam vapour Electrically operated gate are opened, carry out S209; Otherwise, carry out S208, send out the first high steam and the instruction of vapour Electrically operated gate.
S209: judge the first high steam and whether vapour bypass Electrically operated gate closes.If the first high steam vapour bypass Electrically operated gate are closed, setting up procedure terminates; Otherwise, carry out S210, send pass first high steam and the instruction of vapour bypass Electrically operated gate.
In S202, judge that two drag a unit under three kinds of ruuning situation, the automatic input logic of the first high pressure steam system (#1 high pressure steam system) can be continued: 1. the second high pressure steam system (#2 high pressure steam system) is program control does not drop into and the second high steam vapour Electrically operated gate (#2 high steam vapour Electrically operated gate) are closed and the second high steam vapour bypass Electrically operated gate are closed; 2. #2 high steam vapour Electrically operated gate opened and #2 waste heat boiler in operation; 3. #1 (first) high steam vapour Electrically operated gate are opened.
In S205, when the second high pressure steam system (#2 high pressure steam system) under normal operation, continue the first high pressure steam system (#1 high pressure steam system) and steam-operating makes the following condition of demand fulfillment:
[#1 boiler main steam by-pass Electrically operated gate is opened] and
[1. #2 waste heat boiler runs; And #2 high steam load >60%; And #2 high steam vapour Electrically operated gate are opened; And #1 main steam temperature is greater than 390 DEG C; And #1 high steam quality confirms! And #1 high pressure turbine by drops into remote control mode; And steam differential pressure is greater than 0MPa before and after #1 high steam Electrically operated gate; And (#2 high pressure turbine by automatic steam control valve opening is less than 2% and steam turbine power generation power is greater than 10% rated power) or steam turbine trip) }
Or 2. { (before and after #1 high steam Electrically operated gate differential pressure be greater than-0.4MPa or #1 main steam and vapour bypass Electrically operated gate is opened) and #2 boiler main steam vapour Electrically operated gate close }
Or 3. steam turbine trip].
S205 to S209 completes the also vapour process of side high pressure steam system, namely first high steam is opened and vapour bypass Electrically operated gate, wait for and before and after vapour Electrically operated gate steam parameter close to and after receiving manual confirmation high steam quality confirmation signal, then open high steam and vapour Electrically operated gate; Treat high steam and vapour Electrically operated gate is opened, then close high steam and vapour bypass Electrically operated gate.
By the flow process shown in Fig. 2, the automatic input of this gas power station high pressure steam system under system exit status can be realized.
The embodiment of the present invention also provides a kind of on off control method, and be applied to the gas power station two shown in Fig. 1 and drag a unit high pressure steam system, this on off control method comprises: stop step, as shown in Figure 3, this stopping step comprising:
S301: judge whether that out of service or the first high steam bypass pressure control valve of the first waste heat boiler is in automatic position; If the first waste heat boiler is out of service or the first high steam bypass pressure control valve 1 in automatic position, carry out S302.
S302: judge whether that 1. the first waste heat boiler is out of service; Or 2. the first high steam vapour Electrically operated gate are closed; Or 3. the left and right high-pressure main throttle valve of steam turbine is closed; Or 4. the second waste heat boiler reheating main steam vapour Electrically operated gate open and the second main steam flow be greater than 60% and #2 waste heat boiler in operation.If on 1., 2., 3., 4. one of them satisfies condition, and carries out S303.
S303: judge whether the first high steam bypass pressure control valve 1 aperture is greater than 27%, if the first high steam bypass pressure control valve 1 aperture is greater than 27%, carry out S305; If the first high steam bypass pressure control valve aperture is not more than 27%, carry out S304, send the instruction of forcing to open the first high steam bypass pressure control valve to 30%.The forced signal of S304 instruction, means through-flow a part of first high steam of enforced opening high steam pipeline 18, for next step closes the first high steam and vapour Electrically operated gate and non-superpressure creates conditions.
S305: judge whether the first high steam and vapour Electrically operated gate closed and the first high steam bypass vapour Electrically operated gate closed and the first stove reheater entrance adjustment doors has been closed and in manual position, or the first stove reheater entrance adjustment doors opens and the second reheater entrance adjustment doors is closed; If the first high steam vapour Electrically operated gate have been closed and the first high steam bypass vapour Electrically operated gate have been closed and { the first stove reheater entrance adjustment doors has been closed and in manual position, or first stove reheater entrance adjustment doors open and second reheater entrance adjustment doors close, stop step terminating; Otherwise, carry out S306, send closedown first high steam and vapour Electrically operated gate and close the first high steam vapour bypass Electrically operated gate, and close the first reheater entrance adjustment doors and be switched to manual instruction.
On off control method of the present invention (on off control logic) possesses protection exit function: when there is high steam and vapour Electrically operated gate pass or combustion engine trip during two kinds of situations, then ongoing high pressure steam system programed logic can exit immediately.
When gas power station high pressure steam system programed logic moves to a certain step, if condition does not meet, single for judge that this condition can be ignored, manually can carry out the operation that leapfrog action continues control logic, until institute is complete in steps.
In S301, below judging two kinds in situation, just can exit #1 high pressure steam system: 1. #1 waste heat boiler is out of service; Or 2. the other steam control valve of #1 height in automatic position.
In S302, judge further below in four kinds of situations, just can carry out next step high steam and move back steam-operating and do: 1. #1 waste heat boiler is out of service; Or 2. #1 high steam vapour Electrically operated gate are closed; Or 3. the left and right high-pressure main throttle valve of steam turbine is closed; Or 4. #2 waste heat boiler reheating main steam vapour Electrically operated gate open and #2 main steam flow be greater than 60% and #2 waste heat boiler in operation.
On off control method shown in Fig. 3, achieves this gas power station high pressure steam system automatically exiting under input state.
Gas power station two of the present invention drags the programed logic of a unit high pressure steam system to proceed to a certain step, and when not receiving due feedback signal, programed logic can rest on this step, waits for manual operation.Power plant operations staff can find the unreceived feedback signal of current operation step sequence, artificially judges whether unreceived feedback signal affects the continuation execution of programed logic.If this feedback signal does not affect proceeding of present procedure control logic, operations staff can operate the execution that leapfrog action continues programed logic; If this feedback signal affects proceeding of present procedure control logic, then operations staff according to each the unsatisfied feedback signal found, can go investigation problem targetedly, until receive this feedback signal, continues performing a programme control logic.
By the present invention, under this side high pressure steam system exit status, the automatic input of this side high pressure steam system can be realized; Under input state, realize automatically exiting of this side high pressure steam system; Under opposite side high pressure steam system input state, realize the automatic of this side high pressure steam system and vapour.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (13)
1. gas power station two drags a unit high pressure steam system, it is characterized in that, described gas power station two drags a unit high pressure steam system to comprise: the first high pressure steam system, the second high pressure steam system and steam turbine high-pressure cylinder;
First high pressure steam system comprises: the first high steam pipeline, the first high steam vapour Electrically operated gate, the first high steam vapour bypass Electrically operated gate, the first high pressure turbine by control valve, the first Desuperheating device, the first high other desuperheating water pipeline, the first high other desuperheating water adjust valve and the first high other desuperheating water motor-driven valve;
Second high pressure steam system comprises: the second high steam pipeline, the second high steam vapour Electrically operated gate, the second high steam vapour bypass Electrically operated gate, the second high pressure turbine by control valve, the second high other desuperheating water pipeline, the second high other desuperheating water adjust valve and the second high other desuperheating water motor-driven valve;
Described first high steam vapour Electrically operated gate is arranged on the first high steam pipeline, the first high steam the two ends of vapour bypass Electrically operated gate are connected to the first high steam and the two ends of vapour Electrically operated gate; Described first high steam pipeline one end connects steam turbine high-pressure cylinder, and the other end receives from the first waste heat boiler high steam; One end of described first high other desuperheating water pipeline is connected to described first high steam by described first Desuperheating device and the first high pressure turbine by control valve and on described first high steam pipeline between vapour Electrically operated gate and the first waste heat pot, the other end connects the first feed pump;
Described second high steam vapour Electrically operated gate is arranged on described second high steam pipeline, described second high steam the two ends of vapour bypass Electrically operated gate are connected to the two ends of described second high steam vapour Electrically operated gate; Described second high steam pipeline one end connects steam turbine high-pressure cylinder, and the other end receives from the second waste heat boiler high steam; One end of described second high other desuperheating water pipeline is connected to described second high steam by described second high pressure turbine by control valve and on the second high steam pipeline between vapour Electrically operated gate and the second waste heat pot, the other end connects the second feed pump.
2. gas power station two according to claim 1 drags a unit high pressure steam system, it is characterized in that, water one tunnel of the tap of described first feed pump adjusts valve, the first Desuperheating device and the first high pressure turbine by control valve to enter the first high steam pipeline through the first high other desuperheating water motor-driven valve, the first high other desuperheating water successively; Valve, the first Desuperheating device are adjusted through the first high other desuperheating water motor-driven valve, the first high other desuperheating water successively in another road, then go reheater pipeline to enter in the first waste heat boiler by first and press reheater pipeline.
3. gas power station two according to claim 1 drags a unit high pressure steam system, it is characterized in that, water one tunnel of the tap of described second feed pump adjusts valve, the second Desuperheating device and the second high pressure turbine by control valve to enter the second high steam pipeline through the second high other desuperheating water motor-driven valve, the second high other desuperheating water successively; Valve, the second Desuperheating device are adjusted through the second high other desuperheating water motor-driven valve, the second high other desuperheating water successively in another road, then go reheater pipeline to enter in the second waste heat boiler by second and press reheater pipeline.
4. gas power station two according to claim 1 drags a unit high pressure steam system, it is characterized in that, described gas power station two drags in a unit high pressure steam system and is also provided with: the first high pressure steam system programed logic action button and the second high pressure steam system programed logic action button.
5. an on off control method, be applied to gas power station two according to claim 1 and drag a unit high pressure steam system, it is characterized in that, described on off control method comprises:
Judge whether the first high pressure steam system has dropped into automatic position;
If the first high pressure steam system has dropped into automatic position, judged whether to meet first condition, second condition and Article 3 part simultaneously; If asynchronously meet first condition, second condition and Article 3 part, send out the first waste heat boiler reheater entrance Electrically operated gate and throw and highly drain into the automatic instruction of the first waste heat boiler reheater adjustment doors; Wherein,
First condition is:
1. the second high pressure steam system is program control does not drop into and the second waste heat boiler steam vapour Electrically operated gate and the second waste heat boiler steam vapour bypass Electrically operated gate are closed;
Or 2. the second high steam vapour Electrically operated gate are opened, and the second waste heat boiler high pressure main steam flow predetermined percentage and the second waste heat boiler run, and the first high pressure main steam and before and after vapour motor-driven valve steam differential pressure be greater than the first predetermined pressure, and the first waste heat boiler runs;
Or 3. the first high steam vapour Electrically operated gate are opened;
Second condition is: the first waste heat boiler reheater entrance Electrically operated gate is opened;
Article 3 part is: the first waste heat boiler reheater entrance adjustment doors is thrown automatically;
If meet described first condition, second condition and Article 3 part simultaneously, judge the first waste heat boiler main steam pressure and the second waste heat boiler steam and after vapour Electrically operated gate, whether pressure difference value is greater than the second predetermined pressure;
If so, judge whether to meet Article 4 part and Article 5 part simultaneously, or whether meet Article 6 part; If not, the first main steam is sent out and the instruction of vapour bypass Electrically operated gate; Wherein,
Article 4 part is: the first boiler main steam by-pass Electrically operated gate is opened;
Article 5 part is: 1.: meet a, the second waste heat boiler runs; And predetermined percentage described in the second high steam load; And the second high steam vapour Electrically operated gate are opened; And the first main steam temperature is greater than predetermined temperature; And the quality of the first high steam confirms; And the first high pressure turbine by drops into remote control mode; And the first high steam and before and after vapour Electrically operated gate steam differential pressure be greater than the 3rd predetermined pressure; And meet b, the second high pressure turbine by automatic steam control valve opening is less than the first predetermined aperture and steam turbine power generation power is greater than predetermined ratio or the steam turbine trip of rated power;
Or 2. before and after the first high steam Electrically operated gate differential pressure be greater than described second predetermined pressure or the first main steam and vapour bypass Electrically operated gate is opened, and the second boiler main steam vapour Electrically operated gate are closed;
Or 3. steam turbine trip;
Article 6 part is: the first main steam vapour Electrically operated gate are opened;
Judge the first high steam and whether vapour Electrically operated gate is opened; If the first high steam vapour Electrically operated gate are not opened, send out the first high steam and the instruction of vapour Electrically operated gate;
If the first high steam vapour Electrically operated gate are opened, judge the first high steam and whether vapour bypass Electrically operated gate closes, if the first high steam vapour bypass Electrically operated gate are not closed, send pass first high steam and the instruction of vapour bypass Electrically operated gate.
6. on off control method according to claim 5, is characterized in that, described on off control method also comprises:
Judge whether that the first waste heat boiler moves back, or the first high lateral pressure control valve is in automatic position;
If the first waste heat boiler moves back, or the first high lateral pressure control valve is in automatic position, judges whether that the first waste heat boiler is out of service; Or first high steam vapour Electrically operated gate close; Or the left and right high-pressure main throttle valve of steam turbine is closed; Or second waste heat boiler reheating main steam vapour Electrically operated gate open and the second main steam flow be greater than described predetermined percentage and the second waste heat boiler in operation;
If, judge whether the first high steam bypass pressure control valve aperture is greater than the second predetermined aperture, if the first high steam bypass pressure control valve aperture is not more than the second predetermined aperture, send out the instruction of the first high steam bypass pressure control valve to target aperture;
If the first high steam bypass pressure control valve aperture is greater than the second predetermined aperture, judge whether the first high steam and vapour Electrically operated gate has been closed and the first high steam bypass vapour Electrically operated gate are closed; And the first stove reheater entrance adjustment doors has been closed and has been opened in manual position or the first stove reheater entrance adjustment doors and the second reheater entrance adjustment doors pass;
If not, send closedown first high steam and vapour Electrically operated gate and close the first high steam vapour bypass Electrically operated gate, and close the first reheater entrance adjustment doors and be switched to manual instruction.
7. on off control method according to claim 5, is characterized in that, described predetermined percentage is 60%.
8. on off control method according to claim 5, is characterized in that, described first predetermined pressure is-2MPa.
9. on off control method according to claim 5, is characterized in that, described second predetermined pressure is-0.4MPa.
10. on off control method according to claim 5, is characterized in that, described predetermined temperature is 390 DEG C.
11. on off control methods according to claim 5, is characterized in that, described 3rd predetermined pressure is 0MPa.
12. on off control methods according to claim 5, is characterized in that, described first predetermined aperture is 2%.
13. on off control methods according to claim 5, is characterized in that, described second predetermined aperture is 27%.
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| CN111457354A (en) * | 2020-04-08 | 2020-07-28 | 华北电力科学研究院有限责任公司 | Input control method and device for feed water heating system of thermal power plant |
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