CN104613461B

CN104613461B - Gas power station low pressure feed water system and start and stop method thereof

Info

Publication number: CN104613461B
Application number: CN201510052561.0A
Authority: CN
Inventors: 任彦; 黄葆华; 司派友; 刘双白; 吕炜; 左川
Original assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd
Current assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd
Priority date: 2015-02-02
Filing date: 2015-02-02
Publication date: 2016-06-15
Anticipated expiration: 2035-02-02
Also published as: CN104613461A

Abstract

A kind of gas power station low pressure feed water system and start and stop method thereof, described gas power station low pressure feed water system includes: low-pressure drum system and low-pressure economizer system, and described low-pressure drum system connects described low-pressure economizer system; Described low-pressure drum system includes: low-pressure drum, low-pressure drum feedwater main road, low-pressure drum feed water by-pass, low pressure evaporator and low-pressure superheater; Described low-pressure economizer system includes: low-pressure coal saver, the first low-pressure coal saver recirculation pump, the second low-pressure coal saver recirculation pump, low-pressure coal saver entrance main road, low-pressure coal saver outlet main road and low-pressure coal saver bypass. Pass through the present invention, can under gas power station low pressure feed water system full cut-off state, realize the automatic startup of low pressure feed water system, realize being automatically stopped of low pressure feed water system under operation, and when gas power station low pressure feed water components of system as directed starts, realize the automatic startup of low pressure feed water system, and do not disturb original running status.

Description

Gas power station low pressure feed water system and start and stop method thereof

Technical field

The present invention is about gas power station low pressure feed water technology, especially with regard to a kind of gas power station low pressure feed water system and start and stop method thereof.

Background technology

The major function of existing gas power station low pressure feed water system is at desired value by low-pressure drum water lev el control; Put into auxiliary steam heating low-pressure drum water temperature to desired value, thus providing preparatory condition for water on pressure drum high, middle; Start low-pressure coal saver recirculation pump, it is ensured that low-pressure coal saver inlet water temperature is at desired value. But existing gas power station low pressure feed water system cannot under gas power station low pressure feed water system full cut-off state, realize the automatic startup of low pressure feed water system, being automatically stopped of low pressure feed water system cannot be realized under operation, and cannot when gas power station low pressure feed water components of system as directed starts, realize the automatic startup of low pressure feed water system, and do not disturb original running status.

Summary of the invention

Embodiments provide a kind of gas power station low pressure feed water system and starting method thereof, with under gas power station low pressure feed water system full cut-off state or under the state of part startup, realize the automatic startup of low pressure feed water system, and do not disturb original running status.

To achieve these goals, embodiments provide a kind of gas power station low pressure feed water system, described gas power station low pressure feed water system includes: low-pressure drum system and low-pressure economizer system, and described low-pressure drum system connects described low-pressure economizer system;Wherein,

Described low-pressure drum system includes: low-pressure drum, low-pressure drum feedwater main road, low-pressure drum feed water by-pass, low pressure evaporator and low-pressure superheater; Described low-pressure economizer system includes: low-pressure coal saver, the first low-pressure coal saver recirculation pump, the second low-pressure coal saver recirculation pump, low-pressure coal saver entrance main road, low-pressure coal saver outlet main road and low-pressure coal saver bypass;

The deoxygenation head of described low-pressure drum is connected to low-pressure coal saver by described low-pressure drum feedwater main road, and the two ends of described low-pressure drum feed water by-pass are connected to the two ends of described low-pressure drum feedwater main road; The entrance of described low pressure evaporator and outlet are respectively connecting to described low-pressure drum; Described low-pressure drum is connected to the entrance of described low-pressure superheater by a low-pressure drum bursting diaphragm, and the outlet of described low-pressure superheater is connected to condenser and steam turbine;

From condensate system water by main condensate Electrically operated gate be connected to described low-pressure coal saver entrance main road and low-pressure coal saver bypass; The water of described low-pressure coal saver entrance main road enters described low-pressure coal saver, exports after main road enters described first low-pressure coal saver recirculation pump and the pipeline of the second low-pressure coal saver recirculation pump parallel connection through described low-pressure coal saver from described low-pressure coal saver water out and is again introduced into described low-pressure coal saver entrance main road; Described low-pressure coal saver outlet main road and low-pressure coal saver bypass are respectively connecting to low-pressure drum.

In one embodiment, described low-pressure drum system is provided with low pressure feed water system program and controls logical button, condense water water quality ACK button, low-pressure coal saver water filling completes ACK button, auxiliary steam to low-pressure drum heating coil completes ACK button, low-pressure drum water temperature ACK button and low-pressure coal saver recirculation pump interlocking and throws standby button.

In one embodiment, described low-pressure drum is connected to auxiliary vapour header by an oral siphon road.

In one embodiment, the pipeline between low-pressure drum feedwater main road and described low-pressure coal saver is provided with a flow-through orifice.

In one embodiment, the pipeline between low-pressure drum feedwater main road and described deoxygenation head is provided with a steam discharge electrodynamic valve.

In one embodiment, the outlet of described low-pressure superheater is connected to flow-through orifice and non-return flap.

In one embodiment, the pipeline between entrance and the described low-pressure drum of described low pressure evaporator is provided with a flow-through orifice.

In one embodiment, described low-pressure drum is connected to high pressure water pump and middle pressure feed pump.

In one embodiment, the pipeline between described main condensate Electrically operated gate and described low-pressure coal saver entrance main road and low-pressure coal saver bypass is provided with a flow-through orifice.

In one embodiment, the connection pipeline between pipeline and the described low-pressure coal saver entrance main road of described first low-pressure coal saver recirculation pump and the parallel connection of the second low-pressure coal saver recirculation pump is provided with a flow-through orifice, a low-pressure coal saver motorized recycling valve and a low-pressure coal saver recirculation and adjusts valve.

In one embodiment, described flow-through orifice is disposed with on low-pressure coal saver to the described low-pressure coal saver entrance main road between described connection pipeline water and adjusts water electrodynamic valve and low-pressure coal saver bleeding valve on valve, low-pressure coal saver.

To achieve these goals, embodiments providing a kind of gas power station low pressure feed water system start and stop method, described gas power station low pressure feed water system start and stop method includes: starting step, described startup step includes:

Receive the feedback information of combustion engine, judge whether described combustion engine has fire according to described feedback information;

If described combustion engine is without fire, receives the force value of low-pressure drum, and judge that whether described force value is more than the first preset pressure;

If described force value is not more than the first preset pressure, it is judged that the bypass of the urgent draining valve of low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver adjusts whether valve and electrodynamic valve all close, and whether low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve are all opened; If it does not, send the instruction closing the urgent draining valve of described low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver bypass tune valve and electrodynamic valve, and open the instruction of described low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve;

If it is, judge that low voltage bypass adjusts whether valve pressure puts into automatically; If described low voltage bypass adjusts valve pressure automatically not put into, send input low voltage bypass and adjust the automatic instruction of valve pressure;

If described low voltage bypass adjusts valve pressure automatically to put into, it is judged that whether low-pressure drum water level is lower than the first preset water level;

If low-pressure drum water level is lower than the first preset water level, judge that low-pressure drum feed water by-pass regulates whether valve has opened predetermined aperture, and judge that on low-pressure drum feed water by-pass electrodynamic valve, low-pressure coal saver, water adjusts whether water electrodynamic valve on valve, low-pressure coal saver, low-pressure coal saver recirculation adjustment valve, low-pressure coal saver recirculation electrodynamic valve, first and second low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver bleeding valve are all opened; If not, send the instruction that described low-pressure drum feed water by-pass adjustment valve is opened into predetermined aperture, and water on described low-pressure drum feed water by-pass electrodynamic valve, low-pressure coal saver is adjusted water electrodynamic valve on valve, low-pressure coal saver, low-pressure coal saver recirculation regulate the instruction of valve, low-pressure coal saver recirculation electrodynamic valve, first and second low-pressure coal saver recirculation pump outlet Electrically operated gate, the unlatching of low-pressure coal saver bleeding valve;

If it is, judge whether main condensate Electrically operated gate does not close and whether first scheduled time of time delay; If described main condensate Electrically operated gate is closed, or described main condensate Electrically operated gate is not closed but time delay is not up to described first scheduled time, send the instruction opening described second scheduled time of main condensate Electrically operated gate;

If described main condensate Electrically operated gate is not closed and first scheduled time of time delay, it is judged that whether described low-pressure coal saver entrance pipe water filling completes;

If described low-pressure coal saver entrance pipe water filling completes, it is judged that whether described main condensate Electrically operated gate has opened and low-pressure coal saver pipeline bursting diaphragm, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation adjust whether valve, low-pressure coal saver motorized recycling valve close; If it does not, send out described main condensate Electrically operated gate and close the instruction of described low-pressure coal saver pipeline bursting diaphragm, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation tune valve, low-pressure coal saver motorized recycling valve;

If it is, judge that whether described low-pressure drum water level is higher than described first preset water level;

If described low-pressure drum water level is higher than described first preset water level, it is judged that it is automatic that described low-pressure drum feed water by-pass adjusts valve whether to throw water level; If it is automatic that described low-pressure drum feed water by-pass adjusts valve not throw water level, send and adjust valve to throw the automatic instruction of water level described low-pressure drum feed water by-pass;

If described low-pressure drum feed water by-pass adjusts valve to throw automatically, it is judged that auxiliary vapour header pressure whether more than the second preset pressure and temperature whether more than the first preset temperature;

If it is, judge described auxiliary vapour header is to whether low-pressure drum pipeline draining valve is opened; If described auxiliary vapour header is not opened to low-pressure drum pipeline draining valve, send the instruction opening described auxiliary vapour header to low-pressure drum pipeline draining valve;

If described auxiliary vapour header is opened to low-pressure drum pipeline draining valve, it is judged that auxiliary vapour header is to whether low-pressure drum heating coil completes;

If auxiliary vapour header completes to low-pressure drum heating coil, it is judged that whether auxiliary steam has been opened to low-pressure drum Electrically operated gate and auxiliary steam to low-pressure drum regulates whether valve has been opened to the second predetermined aperture; If it does not, send the described auxiliary steam of unlatching to low-pressure drum Electrically operated gate, and described auxiliary steam to low-pressure drum adjustment valve is opened the instruction to described second predetermined aperture;

If it is, judge that auxiliary steam to low-pressure drum regulates whether valve temperature puts into automatically, automatically do not put into if auxiliary steam to low-pressure drum regulates valve temperature, send input auxiliary steam to low-pressure drum and regulate valve temperature automatically to the instruction of a predetermined value;

Automatically put into if auxiliary steam to low-pressure drum regulates valve temperature, it is judged that low-pressure drum water temperature whether more than the second predetermined temperature or low-pressure drum water temperature whether through manual confirmation;

If it is, judge whether the low-pressure coal saver recirculation pump of preliminary election runs, if the low-pressure coal saver recirculation pump off-duty of described preliminary election, send the instruction of the low-pressure coal saver recirculation pump starting described preliminary election;

If the low-pressure coal saver recirculation pump of described preliminary election runs, it is judged that low-pressure coal saver recirculation adjusts whether valve has opened the 3rd predetermined aperture, and whether low-pressure coal saver recirculation electrodynamic valve is opened; If it does not, send, low-pressure coal saver recirculation is adjusted valve be opened into described 3rd predetermined aperture, and by the instruction of low-pressure coal saver recirculation electrodynamic valve unlatching;

If it is, judge whether low-pressure coal saver recirculation pump interlocking puts into, if low-pressure coal saver recirculation pump interlocking does not put into, send the instruction putting into low-pressure coal saver recirculation pump interlocking;

If low-pressure coal saver recirculation pump interlocking puts into, it is judged that whether whether described combustion engine have fire and low-pressure drum pressure more than described first preset pressure;

If described combustion engine has fire and low-pressure drum pressure more than described first preset pressure, it is judged that low-pressure drum feed water by-pass regulates whether valve has thrown water level automatically, and whether low-pressure drum water level is in predetermined water level threshold range, and whether low-pressure drum bursting diaphragm closes; If it does not, send, low-pressure drum feed water by-pass is regulated the instruction that valve water level is thrown automatically and closed low-pressure drum bursting diaphragm.

In one embodiment, described gas power station low pressure feed water system start and stop method includes: stopping step, described stopping step including:

Judge whether described combustion engine has stopped and low voltage bypass regulates whether valve closes;

If described combustion engine has been stopped and low voltage bypass regulates valve and closes, judging that low-pressure drum feedwater main road regulates valve and whether low-pressure drum feed water by-pass feed-regulating valve has closed and whether be switched to manually, whether low-pressure drum feedwater main road electrodynamic valve and low-pressure drum feed water by-pass feedwater electrodynamic valve close; Regulate valve and low-pressure drum feed water by-pass feed-regulating valve if it does not, send closedown low-pressure drum feedwater main road and be switched to manual instruction, and closing described low-pressure drum feedwater main road electrodynamic valve and the instruction of low-pressure drum feed water by-pass feedwater electrodynamic valve;

If low-pressure drum feedwater main road regulates valve and low-pressure drum feed water by-pass feed-regulating valve has closed and be switched to manually, and low-pressure drum feedwater main road electrodynamic valve and low-pressure drum feed water by-pass feedwater electrodynamic valve close, judge that on low-pressure coal saver, water adjusts water electrodynamic valve on valve, low-pressure coal saver, low-pressure coal saver bypass tune valve, low-pressure coal saver bypass electrodynamic valve, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation regulates valve and whether low-pressure coal saver recirculation electrodynamic valve closes, and whether first and second low-pressure coal saver recirculation pump stops transport;

If not, sending water on closedown low-pressure coal saver adjusts water electrodynamic valve on valve, low-pressure coal saver, low-pressure coal saver bypass to adjust valve, low-pressure coal saver bypass electrodynamic valve, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation to regulate valve and low-pressure coal saver recirculation electrodynamic valve and the instruction of first and second low-pressure coal saver recirculation pump described of stopping transport.

In one embodiment, the condition that the permission of described startup step runs is:

Arbitrary condensate pump runs and outlet main-piping pressure meets preset pressure; And

Arbitrary enclosed cooling water pump runs and outlet main-piping pressure is more than 0.45MPa; And

Condense water water quality and meet preassigned.

In one embodiment, the condition that the permission of described stopping step running is:

In waste heat boiler, the middle pressure feed pump in pressure water supply system is stopped transport; And

High-pressure feed water pump shutdown in waste heat boiler high-pressure feed water system.

In one embodiment, in described startup step, if described combustion engine has fire, it is judged that whether low-pressure drum pressure is more than described first preset pressure.

In one embodiment, in described startup step, if described force value is more than described first preset pressure, it is judged that it is automatic whether low-pressure drum feed water by-pass adjustment valve has thrown water level, and whether low-pressure drum water level is in predetermined water level threshold range, and whether low-pressure drum bursting diaphragm closes.

Having the beneficial effects that of the embodiment of the present invention, pass through the present invention, can under gas power station low pressure feed water system full cut-off state, realize the automatic startup of low pressure feed water system, realize being automatically stopped of low pressure feed water system under operation, and when gas power station low pressure feed water components of system as directed starts, it is achieved the automatic startup of low pressure feed water system, and do not disturb original running status.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described 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 premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of the low-pressure drum system of the embodiment of the present invention;

Fig. 2 is the structural representation of the low-pressure economizer system of the embodiment of the present invention;

The startup flow chart of steps of Fig. 3 A and gas power station low pressure feed water system start and stop method that Fig. 3 B is the embodiment of the present invention;

Fig. 4 is the stopping flow chart of steps of the gas power station low pressure feed water system start and stop method of the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.

The embodiment of the present invention provides a kind of gas power station low pressure feed water system, and described gas power station low pressure feed water system includes: low-pressure drum system and low-pressure economizer system, and described low-pressure drum system connects described low-pressure economizer system.

As it is shown in figure 1, described low-pressure drum system includes: low-pressure drum 1, low-pressure drum feedwater main road 2, low-pressure drum feed water by-pass 3, low pressure evaporator 4 and low-pressure superheater 5.

The deoxygenation 6 of low-pressure drum 1 is connected to low-pressure coal saver 35 by low-pressure drum feedwater main road 2, and the two ends of low-pressure drum feed water by-pass 3 are connected to the two ends of low-pressure drum feedwater main road 2; The entrance of described low pressure evaporator 4 and outlet are respectively connecting to described low-pressure drum 1, and wherein, low-pressure drum 1 connects the pipeline of the entrance of low pressure evaporator 4 by filter screen 24;Described low-pressure drum 1 is connected to the entrance of described low-pressure superheater 5 by a low-pressure drum bursting diaphragm 7, the outlet of described low-pressure superheater 5 is connected to condenser and steam turbine (low pressure main steam), and is provided with low voltage bypass tune valve 19 on the pipeline go condenser.

As shown in Figure 1, in described low-pressure drum system, it is provided with low pressure feed water system program and controls logical button a1, condense water water quality ACK button a2, low-pressure coal saver water filling completes ACK button a3, auxiliary steam to low-pressure drum heating coil completes ACK button a4, low-pressure drum water temperature ACK button a5 and standby button a6 thrown by low-pressure coal saver recirculation pump interlocking.

As described in Figure 1, described low-pressure drum 1 is connected to auxiliary vapour header (see carrying out auxiliary steam in Fig. 1) by an outlet pipeline 8, and oral siphon road 8 is above-mentioned is provided with adjustment valve 30, electrodynamic valve 31, auxiliary vapour header to low-pressure drum pipeline draining valve 32, auxiliary vapour header to low-pressure drum pipeline draining valve 33 and non-return flap 34. Pipeline 9 between low-pressure drum feedwater main road 2 and described low-pressure coal saver 35 is provided with a flow-through orifice 10. Pipeline 11 between low-pressure drum feedwater main road 2 and described deoxygenation 6 is provided with a steam discharge electrodynamic valve 12, and described deoxygenation 6 is also connected with deoxygenation electrodynamic valve 27. Low-pressure drum feedwater main road 2 is provided with low-pressure drum feedwater main road and regulates valve 13 and low-pressure drum feedwater main road electrodynamic valve 14, and low-pressure drum feed water by-pass 3 is provided with low-pressure drum feed water by-pass feed-regulating valve 15 and low-pressure drum feed water by-pass feedwater electrodynamic valve 16. The outlet of described low-pressure superheater 5 is connected to flow-through orifice 17 and non-return flap 18. Pipeline 20 between entrance and the described low-pressure drum 1 of described low pressure evaporator 4 is provided with a flow-through orifice 21, low pressure evaporator draining valve 22 and low pressure evaporator draining valve 23. It addition, described low-pressure drum is connected to high pressure water pump, middle pressure feed pump, low-pressure drum safety door 25, low-pressure drum safety door 26, the urgent draining valve of low-pressure drum 28, the urgent draining valve 29 of low-pressure drum. Low-pressure drum system shown in Fig. 1 also has a lot of valves and pipeline, for element commonly used in the art, repeats no more.

As in figure 2 it is shown, described low-pressure economizer system includes: low-pressure coal saver the 35, first low-pressure coal saver recirculation pump the 36, second low-pressure coal saver recirculation pump 37, low-pressure coal saver entrance main road 38, low-pressure coal saver outlet main road 39 and low-pressure coal saver bypass 40.

Water from condensate system passes through non-return flap 55 and main condensate Electrically operated gate 56 is connected to described low-pressure coal saver entrance main road 38 and low-pressure coal saver bypass 40, the water of described low-pressure coal saver entrance main road 38 enters described low-pressure coal saver 35, goes out, from described low-pressure coal saver 35, the water flowed out and is again introduced into described low-pressure coal saver entrance main road 38 after described low-pressure coal saver outlet main road 39 enters the pipeline that described first low-pressure coal saver recirculation pump 36 is in parallel with the second low-pressure coal saver recirculation pump 37, described low-pressure coal saver outlet main road 39 and low-pressure coal saver bypass 40 are respectively connecting to low-pressure drum. described first low-pressure coal saver recirculation pump 36 pipeline in parallel with the second low-pressure coal saver recirculation pump 37 includes the first low-pressure coal saver recirculation pump branch line 41 and the second low-pressure coal saver recirculation pump branch line 42, and the first low-pressure coal saver recirculation pump branch line 41 is provided with the first low-pressure coal saver recirculation pump outlet Electrically operated gate 43, non-return flap 44, filter screen 45, isolating valve 46, isolating valve 47 and inlet valve 48, second low-pressure coal saver recirculation pump branch line 42 is provided with the first low-pressure coal saver recirculation pump outlet Electrically operated gate 49, non-return flap 50, filter screen 51, isolating valve 52, isolating valve 53 and inlet valve 54.

It addition, described main condensate Electrically operated gate 56 and described low-pressure coal saver entrance main road 38 and low-pressure coal saver bypass is provided with a flow-through orifice 57 on the pipeline between 40. Connection pipeline 58 between pipeline and described low-pressure coal saver entrance main road 38 that described first low-pressure coal saver recirculation pump 36 is in parallel with the second low-pressure coal saver recirculation pump 37 is provided with flow-through orifice 59, low-pressure coal saver motorized recycling valve 60 and a low-pressure coal saver recirculation adjusts valve 61. Described flow-through orifice 57 is disposed with on low-pressure coal saver to the described low-pressure coal saver entrance main road 38 between described connection pipeline 58 water and adjusts water electrodynamic valve 63 and low-pressure coal saver bleeding valve 64 on valve 62, low-pressure coal saver. Low-pressure coal saver bypass 40 is provided with low-pressure coal saver bypass and adjusts valve 65 and low-pressure coal saver bypass electrodynamic valve 66. Low-pressure economizer system shown in Fig. 2 also has a lot of valves and pipeline, for element commonly used in the art, repeats no more.

In Fig. 1 and Fig. 2, the effect of low-pressure drum 1 is to receive the condensation water from low-pressure coal saver 35, and provides, as storing container, the pressure drum paramount, middle that feeds water; Additionally by auxiliary steam heat low-pressure drum 1, it is ensured that on pressure drum high, middle coolant-temperature gage suitable while also function to deoxygenation function.

The function of the first low-pressure coal saver recirculation pump 36 and the second low-pressure coal saver recirculation pump 37 is to drive a part to go the condensation water water of heating lower temperature through the water that condenses of the higher temperature of low-pressure coal saver 35, it is ensured that before low-pressure coal saver, condensing water temperature is at desired value. Low pressure feed water pipeline 11 there is water on two-way adjust valve and electrodynamic valve, low-pressure drum main road 2 upper hose footpath is bigger, bypass upper hose footpath is less, uses the upper water of bypass to adjust valve to control flow and is more suitable for, therefore in low-pressure drum bypass 3 water adjust valve be used in programmed logic on water and throw water level and automatically control. Auxiliary steam adjusts valve (the adjustment valve 30 on oral siphon road 8, electrodynamic valve 31) to be used to control low-pressure drum water temperature for low-pressure drum. Condense water to be heated through low-pressure economizer system, condensation water after sub-fraction is heated is driven by the first low-pressure coal saver recirculation pump 36 and the second low-pressure coal saver recirculation pump 37 and goes heat-setting water water, and major part condenses water and adjusts valve and electrodynamic valve to be sent to low-pressure drum through the upper water of low pressure feed water bypass; Auxiliary steam enters low-pressure drum 1 heat low pressure feed water through overregulating valve and electrodynamic valve, also ensure that to the temperature of water on pressure drum high, middle while deoxygenation; The feedwater of low-pressure drum 1 is constantly heated to form steam by low pressure evaporator 4 and returns low-pressure drum 1, and the steam in low-pressure drum is heated to form superheated steam through low-pressure superheater and is supplied to turbine low pressure cylinder acting.

As shown in Fig. 3 A and Fig. 3 B, the embodiment of the present invention provides a kind of gas power station low pressure feed water system start and stop method, and described gas power station low pressure feed water system start and stop method includes: starting step, described startup step includes:

S301: receive the feedback information of combustion engine;

S302: judge whether described combustion engine has fire according to described feedback information;

S303: if described combustion engine is without fire, receives the force value of low-pressure drum, and judge that whether described force value is more than the first preset pressure; In one embodiment, the first preset pressure is 0.1MPa.

If described force value is not more than the first preset pressure, carry out S304.

S304: judge that the bypass of the urgent draining valve of low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver adjusts whether valve and electrodynamic valve all close, and whether low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve are all opened;If not, carry out S305, send the instruction closing the urgent draining valve of described low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver bypass tune valve and electrodynamic valve, and open the instruction of described low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve, to close the urgent draining valve of low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver bypass tune valve and electrodynamic valve, and open low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve.

If the bypass of the urgent draining valve of low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver adjusts valve and electrodynamic valve all to close, and low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve have driven row S306 all into.

S306: judge that low voltage bypass adjusts whether valve pressure puts into automatically; If described low voltage bypass adjusts valve pressure automatically not put into, carry out S307, send input low voltage bypass and adjust the automatic instruction of valve pressure;

If described low voltage bypass adjusts valve pressure automatically to put into, carry out S308.

S308: judge that whether low-pressure drum water level is lower than the first preset water level; In one embodiment, this first preset water level is-1000mm, and the present invention is not limited.

If low-pressure drum water level is lower than the first preset water level, carry out S309.

S309: judge that low-pressure drum feed water by-pass regulates whether valve has opened predetermined aperture, and judge that on low-pressure drum feed water by-pass electrodynamic valve, low-pressure coal saver, water adjusts whether water electrodynamic valve on valve, low-pressure coal saver, low-pressure coal saver recirculation adjustment valve, low-pressure coal saver recirculation electrodynamic valve, first and second low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver bleeding valve are all opened. In one embodiment, this predetermined aperture is 25%, and the present invention is not limited.

If it is no for existing one or more in the feedback judged result of S309, carry out S310, send the instruction that described low-pressure drum feed water by-pass adjustment valve is opened into predetermined aperture, and by described low-pressure drum feed water by-pass electrodynamic valve, on low-pressure coal saver, water adjusts valve, water electrodynamic valve on low-pressure coal saver, low-pressure coal saver recirculation regulates valve, low-pressure coal saver recirculation electrodynamic valve, first and second low-pressure coal saver recirculation pump outlet Electrically operated gate, the instruction that low-pressure coal saver bleeding valve (foregoing invention is called for short first-phase closing valve) is opened, so that described low-pressure drum feed water by-pass adjustment valve is opened into predetermined aperture, by described low-pressure drum feed water by-pass electrodynamic valve, on low-pressure coal saver, water adjusts valve, water electrodynamic valve on low-pressure coal saver, low-pressure coal saver recirculation regulates valve, low-pressure coal saver recirculation electrodynamic valve, first and second low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver bleeding valve is opened.

If low-pressure drum feed water by-pass regulates valve and opened predetermined aperture, and on low-pressure drum feed water by-pass electrodynamic valve, low-pressure coal saver, water adjusts water electrodynamic valve on valve, low-pressure coal saver, low-pressure coal saver recirculation adjustment valve, low-pressure coal saver recirculation electrodynamic valve, first and second low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver bleeding valve all to drive row S311 into.

S311: judge whether main condensate Electrically operated gate does not close and whether first scheduled time of time delay; If described main condensate Electrically operated gate is closed, or described main condensate Electrically operated gate is not closed but time delay is not up to described first scheduled time, carry out S312, send the instruction opening described second scheduled time of main condensate Electrically operated gate, having turned on described second scheduled time of main condensate Electrically operated gate, in one embodiment, this first scheduled time is 120 seconds, this second scheduled time is 5 seconds, and the present invention is not limited.

If described main condensate Electrically operated gate is not closed and first scheduled time of time delay, carry out S313.

S313: judge whether described low-pressure coal saver entrance pipe water filling completes;

If described low-pressure coal saver entrance pipe water filling completes, carry out S314. Here in connection with artificial judgment. When operations staff observes that the bursting diaphragm aerofluxus of low-pressure coal saver pipeline terminates and during continuously water breakthrough, it is possible to click pipeline water filling and complete ACK button, continue next step (S314).

S314: judge described main condensate Electrically operated gate whether opened and low-pressure coal saver pipeline bursting diaphragm, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation adjust valve, low-pressure coal saver motorized recycling valve (above-mentioned low-pressure coal saver pipeline bursting diaphragm, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation adjust valve, low-pressure coal saver motorized recycling valve be called for short second-phase closing valve) whether close.

If in the judged result of S314, there is negative decision, carry out S315, send out described main condensate Electrically operated gate and close the instruction of described low-pressure coal saver pipeline bursting diaphragm, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation tune valve, low-pressure coal saver motorized recycling valve, to open main condensate Electrically operated gate, and close low-pressure coal saver pipeline bursting diaphragm, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation tune valve, low-pressure coal saver motorized recycling valve.

If described main condensate Electrically operated gate has been opened and low-pressure coal saver pipeline bursting diaphragm, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation adjust valve, low-pressure coal saver motorized recycling valve to close and carry out S316.

S316: judge that whether described low-pressure drum water level is higher than described first preset water level;

If described low-pressure drum water level is higher than described first preset water level, carry out S317.

S317: judge that described low-pressure drum feed water by-pass adjusts valve whether to throw water level automatic; If it is automatic that described low-pressure drum feed water by-pass adjusts valve not throw water level, carry out S318, send and adjust valve to throw the automatic instruction of water level described low-pressure drum feed water by-pass, valve is adjusted to throw water level described low-pressure drum feed water by-pass automatic, in one embodiment, it is possible to low-pressure drum feed water by-pass is adjusted valve throw water level automatically to-400mm.

If described low-pressure drum feed water by-pass adjusts valve to throw automatically, carry out the S319 of Fig. 3 B.

S319: judge auxiliary vapour header pressure whether more than the second preset pressure and temperature whether more than the first preset temperature;

If auxiliary vapour header pressure more than the first preset temperature, carries out S320 more than the second preset pressure and temperature. In one embodiment, the second preset pressure is 0.8MPa, and the first preset temperature is 280 degree.

S320: judge described auxiliary vapour header is to whether low-pressure drum pipeline draining valve (auxiliary vapour header to low-pressure drum pipeline draining valve 32 and auxiliary vapour header to low-pressure drum pipeline draining valve 33) is opened; If described auxiliary vapour header is not opened to low-pressure drum pipeline draining valve, carry out S321, send and open described auxiliary vapour header to the instruction of low-pressure drum pipeline draining valve, to open described auxiliary vapour header to low-pressure drum pipeline draining valve.

If described auxiliary vapour header is opened to low-pressure drum pipeline draining valve, carry out S322.

S322: judge auxiliary vapour header is to whether low-pressure drum heating coil completes;

If auxiliary vapour header completes to low-pressure drum heating coil, carry out S323. Here in connection with artificial judgment, when operations staff judge auxiliary steam to low-pressure coal saver hydrophobic pipeline see vapour continuously and during without water, it is possible to click heating coil and complete ACK button, continue next step (S323).

S323: judge whether auxiliary steam has been opened to low-pressure drum Electrically operated gate and auxiliary steam to low-pressure drum regulates whether valve has been opened to the second predetermined aperture; If not, carry out S324, send the described auxiliary steam of unlatching to low-pressure drum Electrically operated gate, and described auxiliary steam to low-pressure drum adjustment valve is opened the instruction to described second predetermined aperture, to open described auxiliary steam to low-pressure drum Electrically operated gate, and described auxiliary steam to low-pressure drum adjustment valve is opened to described second predetermined aperture. In one embodiment, the second predetermined aperture is 5%.

If auxiliary steam has been opened to low-pressure drum Electrically operated gate and auxiliary steam to low-pressure drum regulates valve and is out to the second predetermined aperture, carry out S324.

S324: judge that auxiliary steam to low-pressure drum regulates whether valve temperature puts into automatically, if auxiliary steam to low-pressure drum regulates valve temperature and does not automatically put into, carry out S325, send input auxiliary steam to low-pressure drum and regulate valve temperature automatically to the instruction of a predetermined value, to put into auxiliary steam to low-pressure drum adjustment valve temperature automatically to a predetermined value, in one embodiment, this predetermined value can be 80 degree.

If auxiliary steam to low-pressure drum regulates valve temperature and automatically puts into, carry out S326.

S326: judge low-pressure drum water temperature whether more than the second predetermined temperature or low-pressure drum water temperature whether through manual confirmation. In one embodiment, the second predetermined temperature is 75 DEG C. This step is the step that low-pressure drum water temperature is determined, has also got involved artificial judgment while automatic decision. If low-pressure drum water temperature more than 75 degree, then automatically continues next step; If less than 75 degree, power plant operations staff can according to the temperature difference of the wall temperature of pressure drum high, middle and current low-pressure drum water temperature, judge whether to water on pressure drum high, middle, namely whether can to carry out the program control input action of next step pressure water supply system high, middle.

If low-pressure drum water temperature through manual confirmation, carries out S327 more than the second predetermined temperature or low-pressure drum water temperature.

S327: judge whether the low-pressure coal saver recirculation pump of preliminary election runs, if the low-pressure coal saver recirculation pump off-duty of described preliminary election, carry out S328, send the instruction of the low-pressure coal saver recirculation pump starting described preliminary election, to start the low-pressure coal saver recirculation pump of described preliminary election. The gas power station low pressure feed water system of the present invention is provided with low-pressure coal saver recirculation pump interlocking and throws standby button, and this step axle, by clicking this button, it is possible to the first low-pressure coal saver recirculation pump 36 and the second low-pressure coal saver recirculation pump 37 in advance.

If the low-pressure coal saver recirculation pump of described preliminary election runs, carry out S329.

S329: judge that low-pressure coal saver recirculation adjusts whether valve has opened the 3rd predetermined aperture, and whether low-pressure coal saver recirculation electrodynamic valve is opened; If low-pressure coal saver recirculation is adjusted and do not opened the 3rd predetermined aperture, carry out S330, send and low-pressure coal saver recirculation is adjusted valve be opened into described 3rd predetermined aperture, and by the instruction of low-pressure coal saver recirculation electrodynamic valve unlatching. In one embodiment, the 3rd predetermined aperture is 10%.

If low-pressure coal saver recirculation adjusts valve to open the 3rd predetermined aperture, carry out S331.

S331: judge whether low-pressure coal saver recirculation pump interlocking puts into, if low-pressure coal saver recirculation pump interlocking does not put into, enters S332, sends the instruction putting into low-pressure coal saver recirculation pump interlocking, to put into low-pressure coal saver recirculation pump interlocking.

If low-pressure coal saver recirculation pump interlocking puts into, carry out S333.

S333: judge whether whether described combustion engine have fire and low-pressure drum pressure more than described first preset pressure.

If described combustion engine has fire and low-pressure drum pressure more than described first preset pressure, carry out S334.

S334: judge whether low-pressure drum feed water by-pass adjustment valve has been thrown water level and automatically (can have been thrown water level automatically to setting value, such as 0mm), and whether low-pressure drum water level is in predetermined water level threshold value (predetermined water level threshold value can be such as-50～50mm) scope, and whether low-pressure drum bursting diaphragm closes; If it does not, carry out S335, send and low-pressure drum feed water by-pass is regulated the instruction that valve water level is thrown automatically and closed low-pressure drum bursting diaphragm, so that low-pressure drum feed water by-pass adjustment valve water level is thrown automatically and closed low-pressure drum bursting diaphragm.

As shown in Figure 4, in one embodiment, described gas power station low pressure feed water system start and stop method includes: stopping step, this stopping step including:

S401: judge whether described combustion engine has stopped and low voltage bypass regulates whether valve closes;

If described combustion engine has been stopped and low voltage bypass regulates valve and closes, carry out S402.

Whether S402: judge that low-pressure drum feedwater main road regulates valve and whether low-pressure drum feed water by-pass feed-regulating valve has closed and whether be switched to manually, low-pressure drum feedwater main road electrodynamic valve and low-pressure drum feedwater low-pressure drum feed water by-pass feedwater electrodynamic valve close; If not, carry out S403, send closedown low-pressure drum feedwater main road regulate valve and low-pressure drum feed water by-pass feed-regulating valve and be switched to manual instruction, and close described low-pressure drum feedwater main road electrodynamic valve and the instruction of low-pressure drum feedwater low-pressure drum feed water by-pass feedwater electrodynamic valve, to close low-pressure drum feedwater main road adjustment valve and low-pressure drum feed water by-pass feed-regulating valve and to be switched to manually, and close described low-pressure drum feedwater main road electrodynamic valve and low-pressure drum feedwater low-pressure drum feed water by-pass feedwater electrodynamic valve.

If low-pressure drum feedwater main road regulates valve and low-pressure drum feed water by-pass feed-regulating valve has closed and has been switched to manually, and low-pressure drum feedwater main road electrodynamic valve and low-pressure drum feedwater low-pressure drum feed water by-pass feedwater electrodynamic valve close, carry out S404.

S404: judge that on low-pressure coal saver, water adjusts whether water electrodynamic valve on valve, low-pressure coal saver, low-pressure coal saver bypass tune valve, low-pressure coal saver bypass electrodynamic valve, low-pressure coal saver recirculation pump outlet Electrically operated gate (the first low-pressure coal saver recirculation pump outlet Electrically operated gate 43 and the second low-pressure coal saver recirculation pump outlet Electrically operated gate 49), low-pressure coal saver recirculation adjustment valve and low-pressure coal saver recirculation electrodynamic valve close, and whether the first low-pressure coal saver recirculation pump and the second low-pressure coal saver recirculation pump stop transport.

If not, enter S405, send water on closedown low-pressure coal saver and adjust valve, water electrodynamic valve on low-pressure coal saver, valve is adjusted in low-pressure coal saver bypass, low-pressure coal saver bypass electrodynamic valve, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation regulates valve and low-pressure coal saver recirculation electrodynamic valve, and the instruction of first and second low-pressure coal saver recirculation pump described of stopping transport, to close water tune valve on low-pressure coal saver, water electrodynamic valve on low-pressure coal saver, valve is adjusted in low-pressure coal saver bypass, low-pressure coal saver bypass electrodynamic valve, low-pressure coal saver recirculation pump outlet Electrically operated gate, low-pressure coal saver recirculation regulates valve and low-pressure coal saver recirculation electrodynamic valve, and first and second low-pressure coal saver recirculation pump described of stopping transport.

When being embodied as, the condition that Fig. 3 A and the permission of the startup step shown in Fig. 3 B run is:

Arbitrary condensate pump runs and outlet main-piping pressure meets preset pressure (in one embodiment, this preset pressure is 2.5MPa); And

Condensing water water quality and meet preassigned, this standard is determined according to concrete operating mode.

When being embodied as, the condition that the stopping step permission shown in Fig. 4 runs is:

In waste heat boiler, the middle pressure feed pump in pressure water supply system (pressing pressure feed pump in feed pump and #2 in #1) is stopped transport; And

High pressure water pump (#1 high pressure water pump and #2 high pressure water pump) in waste heat boiler high-pressure feed water system is stopped transport.

In one embodiment, if it is determined that described combustion engine has fire in the S302 of Fig. 3 A, S333 is carried out, it is judged that whether low-pressure drum pressure is more than described first preset pressure. This avoid the interference gas power station original running status of low pressure feed water system, it also avoid the work of the repeated priming of low pressure feed water system.

In one embodiment, in described startup step, if S303 judges that described force value is more than the first preset pressure, carry out S334: judge whether low-pressure drum feed water by-pass adjustment valve has thrown water level automatic, and whether low-pressure drum water level is in predetermined water level threshold range, and whether low-pressure drum bursting diaphragm closes. This step considers low-pressure drum already at hot situation, and therefore this step avoids the interference gas power station original running status of low pressure feed water system, it also avoid the work of the repeated priming of gas power station low pressure feed water system.

In S308, if it is determined that low-pressure drum water level is higher than the first preset water level, carry out S317, it is judged that it is automatic that described low-pressure drum feed water by-pass adjusts valve whether to throw water level. This step considers low-pressure drum water level and has reached the situation of desired value, and therefore this step avoids the interference original running status of low pressure feed water system, it also avoid the upper water conservancy project that repeats of low pressure feed water system and makees.

In the start and stop method of the gas power station low pressure feed water system of the embodiment of the present invention, (programed logic) proceeds to a certain step, and when not receiving due feedback signal, programed logic can rest on this step, waits manual operation. Power plant operations staff can find the currently running unreceived feedback signal of step sequence, artificially judges whether unreceived feedback signal affects continuing executing with of programed logic. If this feedback signal does not affect present procedure controls proceeding of logic, operations staff can operate leapfrog action and continue the execution of programed logic; If this feedback signal affects present procedure controls proceeding of logic, then operations staff according to each found unsatisfied feedback signal, can going investigation problem, until receiving this feedback signal, continuing executing with programed logic targetedly.

The start and stop method (programed logic starts step sequence) of this gas power station low pressure feed water system can automatically engage low-pressure coal saver recirculation pump interlocking, and this is embodied in S331 and S332 starting step sequence. After low-pressure coal saver recirculation pump interlocking puts into, when low-pressure coal saver entrance mother's pipe feed temperature is lower than certain definite value; Or when having arbitrary low-pressure coal saver recirculation pump to trip, all can another low-pressure coal saver recirculation pump of interlocked startup, thus ensureing that low-pressure coal saver entrance mother's pipe feed temperature is normal.

Pass through the present invention, can under gas power station low pressure feed water system full cut-off state, realize the automatic startup of low pressure feed water system, realize being automatically stopped of low pressure feed water system under operation, and when gas power station low pressure feed water components of system as directed starts, realize the automatic startup of low pressure feed water system, and do not disturb original running status.

Those skilled in the art are it should be appreciated that 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, complete software implementation or the embodiment in conjunction with software and hardware aspect. And, the present invention can adopt the form at one or more upper computer programs implemented of computer-usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) wherein including computer usable program code.

The present invention is that flow chart and/or block diagram with reference to method according to embodiments of the present invention, equipment (system) and computer program describe. It should be understood that can by the combination of the flow process in each flow process in computer program instructions flowchart and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame. These computer program instructions can be provided to produce a machine to the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device so that the instruction performed by the processor of computer or other programmable data processing device is produced for realizing the device of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.

These computer program instructions may be alternatively stored in and can guide in the computer-readable memory that computer or other programmable data processing device work in a specific way, the instruction making to be stored in this computer-readable memory produces to include the manufacture of command device, and this command device realizes the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram 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 provides for realizing the step of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.

Applying specific embodiment in the present invention principles of the invention and embodiment are set forth, the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention; Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, all will change in specific embodiments and applications, in sum, this specification content should not be construed as limitation of the present invention.

Claims

1. a gas power station low pressure feed water system, it is characterised in that described gas power station low pressure feed water system includes: low-pressure drum system and low-pressure economizer system, described low-pressure drum system connects described low-pressure economizer system; Wherein,

From condensate system water by main condensate Electrically operated gate be connected to described low-pressure coal saver entrance main road and low-pressure coal saver bypass;The water of described low-pressure coal saver entrance main road enters described low-pressure coal saver, exports after main road enters described first low-pressure coal saver recirculation pump and the pipeline of the second low-pressure coal saver recirculation pump parallel connection through described low-pressure coal saver from described low-pressure coal saver water out and is again introduced into described low-pressure coal saver entrance main road; Described low-pressure coal saver outlet main road and low-pressure coal saver bypass are respectively connecting to low-pressure drum;

Described low-pressure drum system is provided with low pressure feed water system program and controls logical button, condense water water quality ACK button, low-pressure coal saver water filling completes ACK button, auxiliary steam to low-pressure drum heating coil completes ACK button, low-pressure drum water temperature ACK button and low-pressure coal saver recirculation pump interlocking and throws standby button;

Described low-pressure drum is connected to auxiliary vapour header by an oral siphon road.

2. gas power station low pressure feed water system according to claim 1, it is characterised in that the pipeline between low-pressure drum feedwater main road and described low-pressure coal saver is provided with a flow-through orifice.

3. gas power station low pressure feed water system according to claim 1, it is characterised in that the pipeline between low-pressure drum feedwater main road and described deoxygenation head is provided with a steam discharge electrodynamic valve.

4. gas power station low pressure feed water system according to claim 1, it is characterised in that the outlet of described low-pressure superheater is connected to flow-through orifice and non-return flap.

5. gas power station low pressure feed water system according to claim 1, it is characterised in that the pipeline between entrance and the described low-pressure drum of described low pressure evaporator is provided with a flow-through orifice.

6. gas power station low pressure feed water system according to claim 1, it is characterised in that described low-pressure drum is connected to high pressure water pump and middle pressure feed pump.

7. gas power station low pressure feed water system according to claim 1, it is characterised in that be provided with a flow-through orifice on the pipeline between described main condensate Electrically operated gate and described low-pressure coal saver entrance main road and low-pressure coal saver bypass.

8. gas power station low pressure feed water system according to claim 7, it is characterized in that, the connection pipeline between pipeline and the described low-pressure coal saver entrance main road of described first low-pressure coal saver recirculation pump and the parallel connection of the second low-pressure coal saver recirculation pump is provided with a flow-through orifice, a low-pressure coal saver motorized recycling valve and a low-pressure coal saver recirculation and adjusts valve.

9. gas power station low pressure feed water system according to claim 8, it is characterized in that, described flow-through orifice is disposed with on low-pressure coal saver to the described low-pressure coal saver entrance main road between described connection pipeline water and adjusts water electrodynamic valve and low-pressure coal saver bleeding valve on valve, low-pressure coal saver.

10. a gas power station low pressure feed water system start and stop method, it is applied to the gas power station low pressure feed water system according to any one of claim 1-9, it is characterized in that, described gas power station low pressure feed water system start and stop method includes: starting step, described startup step includes:

If described force value is not more than the first preset pressure, it is judged that the bypass of the urgent draining valve of low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver adjusts whether valve and electrodynamic valve all close, and whether low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve are all opened;If it does not, send the instruction closing the urgent draining valve of described low-pressure drum, low pressure evaporator draining valve, low-pressure coal saver bypass tune valve and electrodynamic valve, and open the instruction of described low-pressure drum bursting diaphragm and deoxygenation electrodynamic valve;

If auxiliary vapour header completes to low-pressure drum heating coil, it is judged that whether auxiliary steam has been opened to low-pressure drum Electrically operated gate and auxiliary steam to low-pressure drum regulates whether valve has been opened to the second predetermined aperture;If it does not, send the described auxiliary steam of unlatching to low-pressure drum Electrically operated gate, and described auxiliary steam to low-pressure drum adjustment valve is opened the instruction to described second predetermined aperture;

11. gas power station low pressure feed water system start and stop method according to claim 10, it is characterised in that described gas power station low pressure feed water system start and stop method includes: stopping step, described stopping step including:

12. gas power station low pressure feed water system start and stop method according to claim 11, it is characterised in that the condition that the permission of described startup step runs is:

Condense water water quality and meet preassigned.

13. gas power station low pressure feed water system start and stop method according to claim 11, it is characterised in that the condition that the permission of described stopping step running is:

14. gas power station low pressure feed water system start and stop method according to claim 10, it is characterised in that in described startup step, if described combustion engine has fire, it is judged that whether low-pressure drum pressure is more than described first preset pressure.

15. gas power station low pressure feed water system start and stop method according to claim 10, it is characterized in that, in described startup step, if described force value is more than described first preset pressure, judge whether low-pressure drum feed water by-pass adjustment valve has thrown water level automatic, and whether low-pressure drum water level is in predetermined water level threshold range, and whether low-pressure drum bursting diaphragm closes.