CN105822368A - Bypass starting system and starting method of combined cycle extraction condensing and back pressure unit - Google Patents

Bypass starting system and starting method of combined cycle extraction condensing and back pressure unit Download PDF

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Publication number
CN105822368A
CN105822368A CN201510843413.0A CN201510843413A CN105822368A CN 105822368 A CN105822368 A CN 105822368A CN 201510843413 A CN201510843413 A CN 201510843413A CN 105822368 A CN105822368 A CN 105822368A
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China
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back pressure
pressure
machine
combustion engine
engine load
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CN201510843413.0A
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Chinese (zh)
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CN105822368B (en
Inventor
邵杰
陈书平
李琪
张又新
张卫灵
陈丰
任渊源
石伟栋
丁雁湘
林俊光
Original Assignee
中国能源建设集团浙江省电力设计院有限公司
华能国际电力股份有限公司
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Priority to CN201510843413.0A priority Critical patent/CN105822368B/en
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Abstract

The invention provides a bypass starting system and starting method of a combined cycle extraction condensing and back pressure unit. The bypass starting system mainly comprises an extraction condensing type steam turbine unit, a back pressure type steam turbine unit and a steam condenser. The waste heat boiler capacity of the extraction condensing type steam turbine unit is the same as that of the back pressure type steam turbine unit. The extraction condensing type steam turbine unit is provided with the steam condenser with 100% waste heat boiler steam quantity. When the extraction condensing type steam turbine unit is under the maximum steam extraction condition, the steam condenser can contain the steam quantity generated during starting of the back pressure type steam turbine unit. The extraction condensing type steam turbine unit is provided with three bypasses including the extraction condensing machine 100% gas turbine load high-pressure bypass, the extraction condensing machine 100% gas turbine load medium-pressure bypass and the extraction condensing machine 100% gas turbine load low-pressure bypass. The back pressure type steam turbine unit is provided with a back pressure turbine 10% gas turbine load high-pressure bypass, a back pressure turbine 10% gas turbine load medium-pressure bypass, a back pressure turbine 15% gas turbine load medium-pressure bypass, and a back pressure turbine 100% gas turbine load low-pressure bypass.

Description

A kind of combined cycle takes out the solidifying and by-pass system for staring of back pressure unit and startup method

Technical field

The present invention relates to a kind of combined cycle and take out the solidifying and by-pass system for staring of back pressure unit and startup method, it is adaptable to " one-to-one " gas-steam combined cycle set, belong to Gas-steam Combined Cycle technical field.

Background technology

China is in during readjusting the energy structure, greatly develop Gas-steam Combined Cycle technology, this technology not only output electric energy, also waste heat inferior after generating is used for heat supply, substantially increase energy utilization rate, there is good social efficiency, energy-saving benefit and environmental benefit.

Back pressure unit does not has condenser, to environment, idle discharge vapour need to will be caused noise pollution to idle discharge vapour when being activated individually, and the life for nearby residents exerts an adverse impact;Meanwhile, the steam of discharge causes the loss of working medium.

Summary of the invention

It is an object of the invention to the deficiency overcoming prior art to exist, and provide a kind of rational in infrastructure, compact, and easy to use, noise pollution can be reduced, reclaim working medium, it is achieved take out solidifying and back pressure unit combined launch combined cycle and take out the solidifying and by-pass system for staring of back pressure unit and startup method simultaneously.

It is an object of the invention to complete by following technical solution, a kind of combined cycle takes out the solidifying and by-pass system for staring of back pressure unit, it specifically includes that sucking condensing turbine group, back pressure steam turbines, condenser, the waste heat boiler capacity that described sucking condensing turbine group is configured with back pressure steam turbines is identical, and sucking condensing turbine group is provided with the condenser that capacity is 100% waste heat boiler quantity of steam;Described sucking condensing turbine group is when maximum draws gas operating mode, and condenser can accommodate the quantity of steam produced when back pressure steam turbines starts;Described sucking condensing turbine group is provided with three bypasses altogether, including taking out solidifying machine 100% combustion engine load high pressure turbine by, taking out solidifying machine 100% combustion engine load intermediate pressure by-pass and take out solidifying machine 100% combustion engine load low voltage bypass;

Described back pressure steam turbines is provided with four bypasses altogether, including back pressure machine 10% combustion engine load high pressure turbine by, back pressure machine 10% combustion engine load intermediate pressure by-pass, back pressure machine 15% combustion engine load intermediate pressure by-pass and back pressure machine 100% combustion engine load low voltage bypass.

Solidifying machine 100% combustion engine load high pressure turbine by live steam pipe before taking out solidifying owner's steam valve of taking out of the present invention is drawn, and through bypass valve pressure and temperature reducing, is connected to the high pressure turbine by interface of condenser;Described middle pressure steam pipe before solidifying machine 100% combustion engine load intermediate pressure by-pass therefrom presses stop valve of taking out is drawn, and through bypass valve pressure and temperature reducing, is connected to condenser intermediate pressure by-pass interface;Described solidifying machine 100% combustion engine load low voltage bypass low pressure steam pipe before low pressure stop valve of taking out is drawn, and through bypass valve pressure and temperature reducing, is connected to the low voltage bypass interface of condenser.

Back pressure machine 10% combustion engine load high pressure turbine by of the present invention live steam pipe before back pressure machine stop valve is drawn, and after bypass valve pressure and temperature reducing, accesses pipeline after the valve taking out solidifying machine 100% combustion engine load high pressure turbine by, and is connected to condenser high-pressure bypass interface;Before described back pressure machine 10% combustion engine load intermediate pressure by-pass therefrom presses stop valve, middle pressure steam pipe is drawn, and after bypass valve pressure and temperature reducing, accesses pipeline after the valve taking out solidifying machine 100% combustion engine load intermediate pressure by-pass, and is connected to condenser intermediate pressure by-pass interface;Described back pressure machine 15% combustion engine load intermediate pressure by-pass is drawn from back pressure machine gland steam exhauster, after bypass valve pressure and temperature reducing, with take out solidifying machine 100% combustion engine load intermediate pressure by-pass, back pressure machine 10% combustion engine load intermediate pressure by-pass valve after after pipeline converges into female pipe, be connected to the intermediate pressure by-pass interface of condenser;Described back pressure machine 100% combustion engine load low voltage bypass low pressure steam pipe before low pressure stop valve is drawn, after bypass valve pressure and temperature reducing, with take out solidifying machine 100% low voltage bypass valve after pipeline converge into female pipe and be followed by the low voltage bypass interface to condenser.

A kind of combined cycle described above takes out the startup method of the solidifying by-pass system for staring with back pressure unit, and described startup method comprises the steps:

A) extraction and condensing unit first passes through 100% combustion engine load high, medium and low voltage bypass start-up, and after reaching stable operation situation, bypass valve cuts out;

B) take out solidifying machine and externally carry out extraction for heat supply, progressively reach maximum and draw gas and keep stable operation after operating mode;

C) back pressure unit waste heat boiler brings into operation, when before not up to back pressure machine rolling parameter, the main vapour that waste heat boiler produces enters condenser by back pressure machine 10% combustion engine load high pressure turbine by, after parameter meets back pressure machine rolling parameter, main steam enters back pressure machine, closes back pressure machine 10% combustion engine load high pressure turbine by;

D) after back pressure unit red switch, gland steam exhauster produces not met simultaneously and supplies heat condition steam, now closes gland steam exhauster electric gate valve, and steam discharge enters condenser through back pressure machine 15% combustion engine load intermediate pressure by-pass, after back pressure machine steam discharge meets heating parameter requirement, close back pressure machine 15% combustion engine load intermediate pressure by-pass;

E) low-pressure steam that back pressure unit waste heat boiler produces enters condenser by back pressure machine 100% combustion engine load low voltage bypass before reaching nominal parameter, and after reaching nominal parameter, low-pressure steam enters waste heat boiler, closes back pressure machine 100% combustion engine load low voltage bypass.Beneficial effects of the present invention is embodied in several aspect: first, is taken out the setting of solidifying-back pressure unit by-pass system for staring by combined cycle, solves back pressure machine when being activated individually, the noise pollution producing idle discharge vapour;Second, utilize this primary Ioops of bypass-condenser-waste heat boiler to reclaim working medium;3rd, it is ensured that the clean boot of back pressure machine, meet to greatest extent and take out solidifying-back pressure unit start-up characteristic.

Accompanying drawing explanation

Fig. 1 is that combined cycle of the present invention takes out the solidifying and schematic flow sheet of back pressure unit by-pass system for staring.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention will be described in detail: shown in Fig. 1, a kind of combined cycle of the present invention takes out the solidifying and by-pass system for staring of back pressure unit, it specifically includes that sucking condensing turbine group 1, back pressure steam turbines 2, condenser 3, described sucking condensing turbine group 1 is identical with the waste heat boiler capacity that back pressure steam turbines 2 is configured, and sucking condensing turbine group 1 is provided with the condenser that capacity is 100% waste heat boiler quantity of steam;Described sucking condensing turbine group is when maximum draws gas operating mode, and condenser can accommodate the quantity of steam produced when back pressure steam turbines 2 starts;Described sucking condensing turbine group 1 is provided with three bypasses altogether, including taking out solidifying machine 100% combustion engine load high pressure turbine by 4, taking out solidifying machine 100% combustion engine load intermediate pressure by-pass 5 and take out solidifying machine 100% combustion engine load low voltage bypass 6;

Described back pressure steam turbines 2 is provided with four bypasses altogether, including back pressure machine 10% combustion engine load high pressure turbine by 7, back pressure machine 10% combustion engine load intermediate pressure by-pass 8, back pressure machine 15% combustion engine load intermediate pressure by-pass 9 and back pressure machine 100% combustion engine load low voltage bypass 10.

Solidifying machine 100% combustion engine load high pressure turbine by 4 live steam pipe before taking out solidifying owner's steam valve of taking out of the present invention is drawn, and through bypass valve pressure and temperature reducing, is connected to the high pressure turbine by interface of condenser 3;Described middle pressure steam pipe before solidifying machine 100% combustion engine load intermediate pressure by-pass 5 therefrom presses stop valve of taking out is drawn, and through bypass valve pressure and temperature reducing, is connected to condenser 3 intermediate pressure by-pass interface;Described solidifying machine 100% combustion engine load low voltage bypass 6 low pressure steam pipe before low pressure stop valve of taking out is drawn, and through bypass valve pressure and temperature reducing, is connected to the low voltage bypass interface of condenser 3.

Back pressure machine 10% combustion engine load high pressure turbine by 7 of the present invention live steam pipe before back pressure machine stop valve is drawn, and after bypass valve pressure and temperature reducing, accesses pipeline after the valve taking out solidifying machine 100% combustion engine load high pressure turbine by 4, and is connected to condenser 3 high pressure turbine by interface;Before described back pressure machine 10% combustion engine load intermediate pressure by-pass 8 therefrom presses stop valve, middle pressure steam pipe is drawn, and after bypass valve pressure and temperature reducing, accesses pipeline after the valve taking out solidifying machine 100% combustion engine load intermediate pressure by-pass 5, and is connected to condenser 3 intermediate pressure by-pass interface;Described back pressure machine 15% combustion engine load intermediate pressure by-pass 9 is drawn from back pressure machine gland steam exhauster, after bypass valve pressure and temperature reducing, with take out solidifying machine 100% combustion engine load intermediate pressure by-pass 5, back pressure machine 10% combustion engine load intermediate pressure by-pass 8 valve after after pipeline converges into female pipe, be connected to the intermediate pressure by-pass interface of condenser 3;Described back pressure machine 100% combustion engine load low voltage bypass 10 low pressure steam pipe before low pressure stop valve is drawn, after bypass valve pressure and temperature reducing, with take out solidifying machine 100% low voltage bypass 6 valve after pipeline converge into female pipe and be followed by the low voltage bypass interface to condenser 3.

A kind of combined cycle described above takes out the startup method of the solidifying by-pass system for staring with back pressure unit, and described startup method comprises the steps:

A) extraction and condensing unit first passes through 100% combustion engine load high, medium and low voltage bypass start-up, and after reaching stable operation situation, bypass valve cuts out;

B) take out solidifying machine and externally carry out extraction for heat supply, progressively reach maximum and draw gas and keep stable operation after operating mode;

C) back pressure unit waste heat boiler brings into operation, when before not up to back pressure machine rolling parameter, the main vapour that waste heat boiler produces enters condenser by back pressure machine 10% combustion engine load high pressure turbine by, after parameter meets back pressure machine rolling parameter, main steam enters back pressure machine, closes back pressure machine 10% combustion engine load high pressure turbine by;

D) after back pressure unit red switch, gland steam exhauster produces not met simultaneously and supplies heat condition steam, now closes gland steam exhauster electric gate valve, and steam discharge enters condenser through back pressure machine 15% combustion engine load intermediate pressure by-pass, after back pressure machine steam discharge meets heating parameter requirement, close back pressure machine 15% combustion engine load intermediate pressure by-pass;

E) low-pressure steam that back pressure unit waste heat boiler produces enters condenser by back pressure machine 100% combustion engine load low voltage bypass before reaching nominal parameter, and after reaching nominal parameter, low-pressure steam enters waste heat boiler, closes back pressure machine 100% combustion engine load low voltage bypass.

Claims (4)

1. a combined cycle takes out the solidifying and by-pass system for staring of back pressure unit, it specifically includes that sucking condensing turbine group (1), back pressure steam turbines (2), condenser (3), described sucking condensing turbine group (1) is identical with the waste heat boiler capacity that back pressure steam turbines (2) is configured, and sucking condensing turbine group (1) is provided with the condenser that capacity is 100% waste heat boiler quantity of steam;Described sucking condensing turbine group is when maximum draws gas operating mode, and condenser can accommodate the quantity of steam produced when back pressure steam turbines (2) starts;It is characterized in that described sucking condensing turbine group (1) is provided with three bypasses altogether, including taking out solidifying machine 100% combustion engine load high pressure turbine by (4), taking out solidifying machine 100% combustion engine load intermediate pressure by-pass (5) and take out solidifying machine 100% combustion engine load low voltage bypass (6);
Described back pressure steam turbines (2) is provided with four bypasses altogether, including back pressure machine 10% combustion engine load high pressure turbine by (7), back pressure machine 10% combustion engine load intermediate pressure by-pass (8), back pressure machine 15% combustion engine load intermediate pressure by-pass (9) and back pressure machine 100% combustion engine load low voltage bypass (10).
Combined cycle the most according to claim 1 takes out the solidifying and by-pass system for staring of back pressure unit, it is characterized in that described solidifying machine 100% combustion engine load high pressure turbine by (4) live steam pipe before taking out solidifying owner's steam valve of taking out is drawn, through bypass valve pressure and temperature reducing, it is connected to the high pressure turbine by interface of condenser (3);Described middle pressure steam pipe before solidifying machine 100% combustion engine load intermediate pressure by-pass (5) therefrom presses stop valve of taking out is drawn, and through bypass valve pressure and temperature reducing, is connected to condenser (3) intermediate pressure by-pass interface;Described solidifying machine 100% combustion engine load low voltage bypass (6) low pressure steam pipe before low pressure stop valve of taking out is drawn, and through bypass valve pressure and temperature reducing, is connected to the low voltage bypass interface of condenser (3).
Combined cycle the most according to claim 1 takes out the solidifying and by-pass system for staring of back pressure unit, it is characterized in that described back pressure machine 10% combustion engine load high pressure turbine by (7) live steam pipe before back pressure machine stop valve is drawn, after bypass valve pressure and temperature reducing, pipeline after the valve of solidifying machine 100% combustion engine load high pressure turbine by (4) is taken out in access, and is connected to condenser (3) high pressure turbine by interface;Before described back pressure machine 10% combustion engine load intermediate pressure by-pass (8) therefrom presses stop valve, middle pressure steam pipe is drawn, and after bypass valve pressure and temperature reducing, accesses pipeline after the valve taking out solidifying machine 100% combustion engine load intermediate pressure by-pass (5), and is connected to condenser (3) intermediate pressure by-pass interface;Described back pressure machine 15% combustion engine load intermediate pressure by-pass (9) is drawn from back pressure machine gland steam exhauster, after bypass valve pressure and temperature reducing, with take out solidifying machine 100% combustion engine load intermediate pressure by-pass (5), back pressure machine 10% combustion engine load intermediate pressure by-pass (8) valve after after pipeline converges into female pipe, be connected to the intermediate pressure by-pass interface of condenser (3);Described back pressure machine 100% combustion engine load low voltage bypass (10) low pressure steam pipe before low pressure stop valve is drawn, after bypass valve pressure and temperature reducing, with take out solidifying machine 100% low voltage bypass (6) valve after pipeline converge into female pipe and be followed by the low voltage bypass interface to condenser (3).
4. a combined cycle as described in claim 1 or 2 or 3 takes out the startup method coagulating the by-pass system for staring with back pressure unit, it is characterised in that described startup method comprises the steps:
A) extraction and condensing unit first passes through 100% combustion engine load high, medium and low voltage bypass start-up, and after reaching stable operation situation, bypass valve cuts out;
B) take out solidifying machine and externally carry out extraction for heat supply, progressively reach maximum and draw gas and keep stable operation after operating mode;
C) back pressure unit waste heat boiler brings into operation, when before not up to back pressure machine rolling parameter, the main vapour that waste heat boiler produces enters condenser by back pressure machine 10% combustion engine load high pressure turbine by, after parameter meets back pressure machine rolling parameter, main steam enters back pressure machine, closes back pressure machine 10% combustion engine load high pressure turbine by;
D) after back pressure unit red switch, gland steam exhauster produces not met simultaneously and supplies heat condition steam, now closes gland steam exhauster electric gate valve, and steam discharge enters condenser through back pressure machine 15% combustion engine load intermediate pressure by-pass, after back pressure machine steam discharge meets heating parameter requirement, close back pressure machine 15% combustion engine load intermediate pressure by-pass;
E) low-pressure steam that back pressure unit waste heat boiler produces enters condenser by back pressure machine 100% combustion engine load low voltage bypass before reaching nominal parameter, and after reaching nominal parameter, low-pressure steam enters waste heat boiler, closes back pressure machine 100% combustion engine load low voltage bypass.
CN201510843413.0A 2015-11-26 2015-11-26 A kind of combined cycle takes out the by-pass system for staring and startup method of solidifying and back pressure unit CN105822368B (en)

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