Heat supply energy-saving lifting system of nuclear turbine

Abstract

The invention discloses a heat supply energy-saving lifting system of a nuclear turbine, relates to the field of heat supply, and aims to solve the problem that carbon reduction and energy conservation of a heat supply source cannot be better planned in the conventional heat supply mode. The steam output end of each low-pressure cylinder is connected with the steam input end of one condenser, heat supply network return water is introduced into an inlet of a water inlet pipeline, an outlet of the water inlet pipeline is connected with the heating input end of a heat supply network heater, the heating output end of the heat supply network heater is connected with an inlet of a water outlet pipeline, and an outlet of the water outlet pipeline is connected with the heat supply network return water. The heat supply network circulating pump is arranged on the water inlet pipeline; an inlet of the first cold-state pipeline and an outlet of the first hot-state pipeline are both communicated with the water inlet pipeline, an outlet of the first cold-state pipeline is connected with an inlet of the first cooling circulating water supply pipeline, and an outlet of the first cooling circulating water supply pipeline is connected with the first heating input end of the condenser. A first heating output end of the condenser is connected with an inlet of a first cooling circulating water return pipeline, and an outlet of the first cooling circulating water return pipeline is connected with an inlet of a first thermal state pipeline. The system is used for supplying heat to users.

Description

Technical Field

[0001] The invention relates to the field of heating and belongs to a heating system. Background Art

[0002] With the continuous development of urbanization in my country, the scale of heating is constantly expanding. At the same time, in order to make efficient use of energy, the heating method is becoming more centralized. At present, large-scale coal-fired cogeneration units are mainly responsible for heating. The main fuel is still fossil fuels. It is difficult to avoid the emission of chemical pollutants such as carbon and sulfur. The livelihood demand for centralized heating has become the main obstacle to carbon emission reduction. Compared with other forms of heating such as traditional fossil energy, nuclear power plant heating has very obvious environmental advantages: nuclear fission has a high energy density. Compared with coal-fired boilers of the same power, the annual transportation volume of nuclear fuel is only about one hundred thousandth of the coal volume; nuclear energy heating can also significantly reduce carbon dioxide emissions, which coincides with the demand for "carbon emission reduction".

[0003] However, existing large-power nuclear power plant steam turbine heating mostly uses high-pressure cylinder exhaust steam extraction modification to achieve heating, but fails to better plan the heating source to further reduce carbon emissions and save energy. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing heating mode fails to better plan the heating source and further reduce carbon emissions and save energy, and proposes a nuclear power steam turbine heating energy-saving improvement system.

[0005] A nuclear power steam turbine heating energy-saving and improving system, the system comprises a steam-water separator reheater, a high-pressure cylinder, n low-pressure cylinders and n steam inlet hydraulic quick-opening valves; the steam input end of the steam-water separator reheater is connected to the nuclear power secondary circuit main steam, the steam output end of the steam-water separator reheater is connected to the input end of the high-pressure cylinder, the output end of the high-pressure cylinder is connected to the reheat input end of the steam-water separator reheater, the reheat output end of the steam-water separator reheater is simultaneously connected to the steam input ends of n low-pressure cylinders, 1≤n≤3, and one steam inlet hydraulic quick-opening valve is respectively arranged on the pipeline between the steam-water separator reheater and each low-pressure cylinder;

[0006] The system also includes n heating devices;

[0007] Each heating device includes a No. 1 cold state pipeline, a No. 1 cooling circulating water supply pipeline, a condenser, a No. 1 cooling circulating water return pipeline, a No. 1 hot state pipeline, a heating network circulation pump, a water inlet pipeline, a heating network heater and a water outlet pipeline;

[0008] The steam output end of each low-pressure cylinder is connected to the steam input end of a condenser, the return water of the heating network is introduced into the inlet of the water inlet pipe, the outlet of the water inlet pipe is connected to the heating input end of the heating network heater, the heating output end of the heating network heater is connected to the inlet of the water outlet pipe, the outlet of the water outlet pipe is connected to the return water of the heating network, and the circulation pump of the heating network is arranged on the water inlet pipe;

[0009] The inlet of the No. 1 cold state pipeline and the outlet of the No. 1 hot state pipeline are both connected to the water inlet pipeline, the outlet of the No. 1 cold state pipeline is connected to the inlet of the No. 1 cooling circulating water supply pipeline, the outlet of the No. 1 cooling circulating water supply pipeline is connected to the first heating input end of the condenser, the first heating output end of the condenser is connected to the inlet of the No. 1 cooling circulating water return pipeline, and the outlet of the No. 1 cooling circulating water return pipeline is connected to the inlet of the No. 1 hot state pipeline.

[0010] Preferably, each heating device further comprises a No. 2 cold state pipeline, a No. 2 cooling circulating water supply pipeline, a No. 2 cooling circulating water return pipeline and a No. 2 hot state pipeline;

[0011] The inlet of the No. 2 cold state pipeline is connected with the No. 1 cold state pipeline, the outlet of the No. 2 cold state pipeline is connected with the inlet of the No. 2 cooling circulating water supply pipeline, the outlet of the No. 2 cooling circulating water supply pipeline is connected with the second heating input end of the condenser, the second heating output end of the condenser is connected with the inlet of the No. 2 cooling circulating water return pipeline, the outlet of the No. 2 cooling circulating water return pipeline is connected with the inlet of the No. 2 hot state pipeline, and the outlet of the No. 2 hot state pipeline is connected with the No. 1 hot state pipeline.

[0012] Preferably, each heating device further comprises 4 No. 1 electric butterfly valves;

[0013] One No. 1 electric butterfly valve is respectively provided on the No. 1 cold pipe, the No. 2 cold pipe, the No. 1 hot pipe and the No. 2 hot pipe.

[0014] Preferably, each heating device further comprises 4 No. 2 electric butterfly valves;

[0015] The outlets of the No. 1 cooling circulating water return pipe and the No. 2 cooling circulating water return pipe are both connected to the circulating cooling water return water, and the inlets of the No. 1 cooling circulating water supply pipe and the No. 2 cooling circulating water supply pipe are both connected to the circulating cooling water supply water;

[0016] A No. 2 electric butterfly valve is installed at each inlet of the circulating cooling water return and circulating cooling water supply.

[0017] Preferably, each heating device further comprises a flow meter;

[0018] The flow meter is arranged at the outlet of the water outlet pipe.

[0019] Preferably, each heating device further comprises a dirt remover;

[0020] The dirt remover is arranged at the inlet of the water inlet pipe.

[0021] Preferably, each heating device further comprises a No. 3 electric butterfly valve;

[0022] The No. 3 electric butterfly valve is installed in the water inlet pipe between the heating network circulation pump and the desludging device.

[0023] The beneficial effects of the present invention are:

[0024] The present invention uses a condenser to preliminarily heat the heat network circulating water (heat network return water) on the basis of high-pressure cylinder exhaust steam heating of the steam turbine in a large-power nuclear power plant, and then outputs it to the heat network water supply pipeline for heating after being heated by the heat network heater. Since the condenser is used to preliminarily heat the heat network circulating water (heat network return water), the steam extraction of the heat network heater is reduced, the overall heating economy and the power generation capacity of the unit are improved, and the effect of energy saving and carbon reduction is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the principle of a nuclear power steam turbine heating energy-saving improvement system. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0029] Example:

[0030] Combination Figure 1 The present embodiment is described, a nuclear power steam turbine heating energy-saving improvement system, the system comprises a steam-water separator reheater 1, a high-pressure cylinder 2, n low-pressure cylinders 3 and n steam inlet hydraulic quick-opening valves 4; the steam input end of the steam-water separator reheater 1 is connected to the nuclear power secondary circuit main steam, the steam output end of the steam-water separator reheater 1 is connected to the input end of the high-pressure cylinder 2, the output end of the high-pressure cylinder 2 is connected to the reheat input end of the steam-water separator reheater 1, the reheat output end of the steam-water separator reheater 1 is simultaneously connected to the steam input ends of the n low-pressure cylinders 3, 1≤n≤3, and one steam inlet hydraulic quick-opening valve 4 is respectively arranged on the pipeline between the steam-water separator reheater 1 and each low-pressure cylinder 3;

[0031] The system also includes n heating devices;

[0032] Each heating device includes a No. 1 cold state pipeline 11, a No. 1 cooling circulating water supply pipeline 13, a condenser 14, a No. 1 cooling circulating water return pipeline 15, a No. 1 hot state pipeline 16, a heating network circulation pump 17, a water inlet pipeline 18, a heating network heater 19 and a water outlet pipeline 20;

[0033] The steam output end of each low-pressure cylinder 3 is connected to the steam input end of a condenser 14, the return water of the heat network is introduced into the inlet of the water inlet pipe 18, the outlet of the water inlet pipe 19 is connected to the heating input end of the heat network heater 19, the heating output end of the heat network heater 19 is connected to the inlet of the water outlet pipe 20, the outlet of the water outlet pipe 20 is connected to the return water of the heat network, and the heat network circulation pump 17 is arranged on the water inlet pipe 18;

[0034] The inlet of the No. 1 cold state pipeline 11 and the outlet of the No. 1 hot state pipeline 16 are both connected to the water inlet pipeline 18, the outlet of the No. 1 cold state pipeline 11 is connected to the inlet of the No. 1 cooling circulating water supply pipeline 13, the outlet of the No. 1 cooling circulating water supply pipeline 13 is connected to the first heating input end of the condenser 14, the first heating output end of the condenser 14 is connected to the inlet of the No. 1 cooling circulating water return pipeline 15, and the outlet of the No. 1 cooling circulating water return pipeline 15 is connected to the inlet of the No. 1 hot state pipeline 16.

[0035] It is further defined that each heating device also includes a No. 2 cold state pipeline 21, a No. 2 cooling circulating water supply pipeline 22, a No. 2 cooling circulating water return pipeline 23 and a No. 2 hot state pipeline 24;

[0036] The inlet of the No. 2 cold state pipeline 21 is connected with the No. 1 cold state pipeline 11, the outlet of the No. 2 cold state pipeline 21 is connected with the inlet of the No. 2 cooling circulating water supply pipeline 22, the outlet of the No. 2 cooling circulating water supply pipeline 22 is connected with the second heating input end of the condenser 14, the second heating output end of the condenser 14 is connected with the inlet of the No. 2 cooling circulating water return pipeline 23, the outlet of the No. 2 cooling circulating water return pipeline 23 is connected with the inlet of the No. 2 hot state pipeline 24, and the outlet of the No. 2 hot state pipeline 24 is connected with the No. 1 hot state pipeline 17.

[0037] It is further defined that each heating device also includes four No. 1 electric butterfly valves 12;

[0038] One No. 1 electric butterfly valve 12 is respectively provided on the No. 1 cold state pipeline 11 , the No. 2 cold state pipeline 21 , the No. 1 hot state pipeline 16 and the No. 2 hot state pipeline 24 .

[0039] It is further defined that each heating device also includes four No. 2 electric butterfly valves 25;

[0040] The outlets of the No. 1 cooling circulating water return pipe 15 and the No. 2 cooling circulating water return pipe 23 are both connected to the circulating cooling water return water, and the inlets of the No. 1 cooling circulating water supply pipe 13 and the No. 2 cooling circulating water supply pipe 22 are both connected to the circulating cooling water supply water;

[0041] A No. 2 electric butterfly valve 25 is respectively provided at the inlet of the circulating cooling water return water and the circulating cooling water supply water.

[0042] Specifically, when the steam turbine of a large-power nuclear power plant is in operation, a large amount of exhaust steam needs to be cooled by circulating cooling water, which can be recycled during the heating period.

[0043] The condenser can be operated on one side or on both sides;

[0044] Advantages of double-sided operation of the condenser: During the heating period, if the condenser fails or a certain heating circuit fails, firstly, the original heating mode can be maintained; secondly, the No. 2 electric butterfly valve 25 on the No. 1 cooling circulating water supply pipe 13, the No. 2 electric butterfly valve 25 on the No. 1 cooling circulating water return pipe 15, the No. 1 electric butterfly valve 12 on the No. 2 cold pipe 21, and the No. 1 electric butterfly valve 12 on the No. 2 hot pipe 24 can be opened, and the No. 2 electric butterfly valve 25 on the cooling circulating water supply pipe 22, the No. 2 electric butterfly valve 25 on the No. 2 cooling circulating water return pipe 23, the No. 1 electric butterfly valve 12 on the No. 1 cold pipe 11, and the No. 1 electric butterfly valve 16 on the No. 1 hot pipe can be closed. Valve 12, or open the No. 2 electric butterfly valve 25 on the cooling circulating water supply pipe 22, the No. 2 electric butterfly valve 25 on the No. 2 cooling circulating water return pipe 23, the No. 1 electric butterfly valve 12 on the No. 1 cold pipe 11, and the No. 1 electric butterfly valve 12 on the No. 1 hot pipe 16, and close the No. 2 electric butterfly valve 25 on the No. 1 cooling circulating water supply pipe 13, the No. 2 electric butterfly valve 25 on the No. 1 cooling circulating water return pipe 15, the No. 1 electric butterfly valve 12 on the No. 2 cold pipe 21, and the No. 1 electric butterfly valve 12 on the No. 2 hot pipe 24, to achieve single-sided operation of the condenser to support the maintenance work of condenser failure or a heating circuit failure, with a certain degree of adjustability.

[0045] It is further defined that each heating device further includes a flow meter 32;

[0046] The flow meter 32 is disposed at the outlet of the water outlet pipe 20 .

[0047] It is further defined that each heating device also includes a dirt remover 33;

[0048] The dirt remover 33 is arranged at the inlet of the water inlet pipe 18 .

[0049] It is further defined that each heating device also includes a third electric butterfly valve 34;

[0050] The third electric butterfly valve 34 is arranged on the water inlet pipe 18 between the heating network circulation pump 17 and the decontamination device 33 .

[0051] Working principle:

[0052] The main steam of the secondary circuit of the nuclear power plant passes through the steam-water separation reheater 1, is cooled by the exhaust steam of the high-pressure cylinder 2, and then enters the high-pressure cylinder 2 to do work. The exhaust steam of the high-pressure cylinder 2 passes through the steam-water separation reheater 1 and is heated by the main steam of the secondary circuit of the nuclear power plant, and then enters the low-pressure cylinder 3 through the steam inlet quick opening valve 4 to do work;

[0053] The method of realizing large-scale centralized heating by a large-power nuclear power steam turbine is as follows: the heating extraction steam is taken from the exhaust steam of the high-pressure cylinder 2 between the reference numeral 2 and the sequence number 1, and is connected to the heating network heater 19 of the first station of the heating network in the nuclear power plant through the heating extraction steam interface 10, and the heating steam pipeline is provided with a safety valve 5, a pneumatic check valve 6, a hydraulic fast pipe valve 7, an electric shut-off valve 8 and a flow meter 9 in turn;

[0054] The circulating water in the return water pipe of the heating network is pressurized by the decontaminator 33 and the circulating pump 17 of the heating network, and then enters the heating network heater 19 through the water inlet pipe 18 on the water side of the heating network heater, and after being heated by the heating extraction steam, enters the water outlet pipe 20 on the water side of the heating network heater, and enters the water supply pipe of the heating network for heating through the circulating water flow meter 32 of the heating network;

[0055] At this time, at the beginning and end of heating, in order to improve the overall thermal economy of heating and the power generation capacity of the unit, the exhaust steam of the low-pressure cylinder can be used to heat the circulating water of the heating network for heating, thereby increasing the temperature of the circulating water of the heating network and reducing the amount of steam extraction for heating; the specific process is: closing the four No. 2 electric butterfly valves 25, while closing the No. 3 electric butterfly valve 34, opening the four No. 1 electric butterfly valves 12, the circulating water return of the heating network passes through the No. 1 cold pipe 11 into the No. 1 cooling circulating water supply pipe 13, and after being heated by the condenser exhaust steam, it is transformed into the heated circulating water return of the heating network, and passes through the No. 1 cooling circulating water return pipe 15, the No. 1 hot pipe 16 and the water inlet pipe 18 in turn into the heating network heater 19, and is heated by the heating extraction steam. In this way, the waste heat of the exhaust steam can be recovered, the heating extraction steam can be saved, and the thermal economy and power generation capacity can be improved;

[0056] In the non-heating season, the four No. 2 electric butterfly valves 25 are opened, and the cooling circulating water is normally used to enter the condenser to cool the exhaust steam. The heating system is not put into use, so the four No. 1 electric butterfly valves 12 and the No. 3 electric butterfly valve 34 are closed.

[0057] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A nuclear power steam turbine heating energy-saving improvement system, the system comprising a steam-water separation reheater (1), a high-pressure cylinder (2), n low-pressure cylinders (3) and n steam inlet hydraulic quick-opening valves (4); the steam input end of the steam-water separation reheater (1) is connected to the main steam of the nuclear power secondary circuit, the steam output end of the steam-water separation reheater (1) is connected to the input end of the high-pressure cylinder (2), the output end of the high-pressure cylinder (2) is connected to the reheat input end of the steam-water separation reheater (1), and the reheat output end of the steam-water separation reheater (1) is simultaneously connected to the steam input ends of n low-pressure cylinders (3), 1≤n≤3, and one steam inlet hydraulic quick-opening valve (4) is respectively arranged on the pipeline between the steam-water separation reheater (1) and each low-pressure cylinder (3); It is characterized in that The system also includes n heating devices; Each heating device comprises a first cold state pipeline (11), a first cooling circulating water supply pipeline (13), a condenser (14), a first cooling circulating water return pipeline (15), a first hot state pipeline (16), a heating network circulation pump (17), a water inlet pipeline (18), a heating network heater (19) and a water outlet pipeline (20); The steam output end of each low-pressure cylinder (3) is connected to the steam input end of a condenser (14); the return water of the heating network is introduced into the inlet of the water inlet pipe (18); the outlet of the water inlet pipe (19) is connected to the heating input end of the heating network heater (19); the heating output end of the heating network heater (19) is connected to the inlet of the water outlet pipe (20); the outlet of the water outlet pipe (20) is connected to the return water of the heating network; and the heating network circulation pump (17) is arranged on the water inlet pipe (18); The inlet of the first cold state pipeline (11) and the outlet of the first hot state pipeline (16) are both connected to the water inlet pipeline (18); the outlet of the first cold state pipeline (11) is connected to the inlet of the first cooling circulating water supply pipeline (13); the outlet of the first cooling circulating water supply pipeline (13) is connected to the first heating input end of the condenser (14); the first heating output end of the condenser (14) is connected to the inlet of the first cooling circulating water return pipeline (15); and the outlet of the first cooling circulating water return pipeline (15) is connected to the inlet of the first hot state pipeline (16).

2. A nuclear power steam turbine heating energy-saving improvement system according to claim 1, characterized in that: Each heating device also includes a No. 2 cold state pipeline (21), a No. 2 cooling circulating water supply pipeline (22), a No. 2 cooling circulating water return pipeline (23) and a No. 2 hot state pipeline (24); The inlet of the second cold state pipeline (21) is connected to the first cold state pipeline (11), the outlet of the second cold state pipeline (21) is connected to the inlet of the second cooling circulation water supply pipeline (22), the outlet of the second cooling circulation water supply pipeline (22) is connected to the second heating input end of the condenser (14), the second heating output end of the condenser (14) is connected to the inlet of the second cooling circulation water return pipeline (23), the outlet of the second cooling circulation water return pipeline (23) is connected to the inlet of the second hot state pipeline (24), and the outlet of the second hot state pipeline (24) is connected to the first hot state pipeline (17).

3. A nuclear power steam turbine heating energy-saving improvement system according to claim 2, characterized in that: Each heating device also includes four No. 1 electric butterfly valves (12); A No. 1 electric butterfly valve (12) is respectively provided on the No. 1 cold state pipeline (11), the No. 2 cold state pipeline (21), the No. 1 hot state pipeline (16) and the No. 2 hot state pipeline (24).

4. A nuclear power steam turbine heating energy-saving improvement system according to claim 3, characterized in that: Each heating device also includes four No. 2 electric butterfly valves (25); The outlets of the No. 1 cooling circulating water return pipe (15) and the No. 2 cooling circulating water return pipe (23) are both connected to the circulating cooling water return water, and the inlets of the No. 1 cooling circulating water supply pipe (13) and the No. 2 cooling circulating water supply pipe (22) are both connected to the circulating cooling water supply water; A No. 2 electric butterfly valve (25) is respectively provided at the inlet of the circulating cooling water return water and the circulating cooling water supply water.

5. A nuclear power steam turbine heating energy-saving improvement system according to claim 1, characterized in that: Each heating device also includes a flow meter (32); The flow meter (32) is arranged at the outlet of the water outlet pipe (20).

6. A nuclear power steam turbine heating energy-saving improvement system according to claim 1, characterized in that: Each heating device also includes a dirt remover (33); The dirt remover (33) is arranged at the inlet of the water inlet pipe (18).

7. A nuclear power steam turbine heating energy-saving improvement system according to claim 6, characterized in that: Each heating device also includes a third electric butterfly valve (34); The third electric butterfly valve (34) is arranged on the water inlet pipe (18) between the heating network circulation pump (17) and the dirt remover (33).

Images