High-power nuclear turbine heat supply system

Abstract

The invention discloses a heat supply system of a high-power nuclear turbine, relates to the field of heat supply, and aims to solve the problems of high emission of chemical pollutants such as carbon and sulfur and environmental pollution in the conventional heat supply mode. The steam extraction device is used for extracting steam from the output end of the high-pressure cylinder and feeding the steam into the multiple sets of heat exchange devices connected in parallel; and each set of heat exchange device is used for heating circulating water output by the heat user in each region by using the received steam, so that the obtained circulating water with heat is supplied to the heat user in each region. The system is used for supplying heat to users.

Description

Technical Field

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

[0002] With the continuous development of urbanization in China, the scale of heating has been expanding. At the same time, for the efficient utilization of energy, the heating method has become increasingly centralized. Currently, large-scale coal-fired and thermal power co-generation units are mainly responsible for heating, and the main fuel is still fossil fuel, making it difficult to avoid the problem of emissions of chemical pollutants such as carbon and sulfur. The livelihood demand for centralized heating has become the main obstacle to carbon emission reduction.

[0003] Therefore, in the existing heating methods, the emissions of chemical pollutants such as carbon and sulfur are high, polluting the environment. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that in the existing heating methods, the emissions of chemical pollutants such as carbon and sulfur are high and pollute the environment, and a high-power nuclear power steam turbine heating system is proposed.

[0005] A high-power nuclear power steam turbine heating system, the system includes a nuclear power steam turbine unit, and the nuclear power steam turbine unit includes a high-pressure cylinder, a plurality of low-pressure cylinders and a steam-water separation and reheater; the steam input end of the steam-water separation and reheater is connected to the main steam of the second nuclear power loop, the steam output end of the steam-water separation and 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 separation and reheater, and the reheat output end of the steam-water separation and reheater is simultaneously connected to the input ends of a plurality of low-pressure cylinders;

[0006] The system further includes an extraction steam device and multiple sets of heat exchange devices;

[0007] The extraction steam device is used to extract steam from the output end of the high-pressure cylinder and send it into multiple sets of parallel heat exchange devices;

[0008] Each set of heat exchange devices is used to heat the circulating water output by the heat users in each area by using the received steam, and obtain the circulating water with heat to supply heat to the heat users in each area.

[0009] Preferably, each set of heat exchange devices includes a heat network heater, a cold-state heat network circulating water pipeline, a hot-state heat network circulating water pipeline, a heat exchange station, a cold-state secondary network heating pipeline and a hot-state secondary network heating pipeline;

[0010] The steam input end of the heat network heater is connected to the steam output end of the steam extraction device. The heating input end of the heat network heater is connected to one end of the cold-state heat network circulating water pipeline. The heating output end of the heat network heater is connected to the first input end of the heat exchange station. The first output end of the heat exchange station is connected to the other end of the cold-state heat network circulating water pipeline. The second output end of the heat exchange station is connected to the input end of the heat user. The output end of the heat user is connected to one end of the cold-state secondary network heating pipeline. The other end of the cold-state secondary network heating pipeline is connected to the second input end of the heat exchange station.

[0011] Preferably, the steam extraction device includes a heating steam pipeline, a safety valve for the heating steam pipeline, a pneumatic check valve for the heating steam pipeline, and a hydraulic quick-closing valve for the heating steam pipeline;

[0012] One end of the heating steam pipeline extracts steam from the output end of the high-pressure cylinder. The other end of the heating steam pipeline is connected to the steam input end of the heat network heater. The safety valve for the heating steam pipeline, the pneumatic check valve for the heating steam pipeline, and the hydraulic quick-closing valve for the heating steam pipeline are all arranged on the heating steam pipeline.

[0013] Preferably, the steam extraction device further includes an electric shut-off valve for the heating steam pipeline and a flowmeter for the heating steam pipeline;

[0014] The electric shut-off valve for the heating steam pipeline and the flowmeter for the heating steam pipeline are both arranged on the heating steam pipeline.

[0015] The beneficial effects of the present invention are as follows:

[0016] Compared with other heating forms such as traditional fossil energy, nuclear power plant heating has very obvious environmental protection advantages: the energy density of nuclear fission is large. Compared with a coal-fired boiler 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 requirement of "carbon emission reduction".

[0017] For the steam extraction transformation of a high-power nuclear power steam turbine, due to different steam operating parameters from those of a thermal power unit, the steam supply source selection method is different. The main steam at the inlet of the nuclear power unit is wet steam, and the humidity reaches about 10%-14% when expanding and doing work to the high-pressure cylinder exhaust. There is no superheat degree, and the steam quality of the high-pressure cylinder exhaust is low, which can be used as the steam source for external heating extraction. Therefore, the steam supply source for heating is taken from the high-pressure cylinder exhaust of the high-power nuclear power steam turbine, and part of the steam is extracted as the heat source of the heat network to heat the heat network circulating water. The heated heat network circulating water passes through the heat exchange station and delivers the heat to the heat user.

[0018] This method is applicable to high-power steam turbine nuclear power units with heating requirements nearby. After transformation, a heating steam extraction volume of 1500 t / h can be achieved.

[0019] Under the conditions of large capacity and baseload operation, nuclear power plants show economic superiority compared to thermal power plants. Nuclear power units are clean in energy, have relatively low parameters, good heat supply efficiency, large steam volume, and high heat supply capacity, which can fully meet the current demand of the heat supply market. If all nuclear power plants in the centralized heat supply area implement heat supply, they can meet 25% of the heat supply load in the market.

[0020] Therefore, the present invention adopts the method of extracting steam from a high-power nuclear power steam turbine to supply heat to heat users. This heat supply method reduces pollutant emissions, and a heat exchange device is used to process the extracted steam to maximize heat supply to users, achieving the effect of energy conservation and carbon reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a high-power nuclear power steam turbine heat supply system. In the figure, the reference numeral 18 represents an inlet steam hydraulic quick-opening valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0024] Next, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present invention.

[0025] Embodiment:

[0026] Combined Figure 1 To illustrate this embodiment, a high-power nuclear power steam turbine heat supply system is provided. The system includes a nuclear power steam turbine unit, and the nuclear power steam turbine unit includes a high-pressure cylinder 1, a plurality of low-pressure cylinders 2, and a moisture separator reheater 3. The steam input end of the moisture separator reheater 3 is connected to the main steam of the nuclear power secondary circuit, the steam output end of the moisture separator reheater 3 is connected to the input end of the high-pressure cylinder 1, the output end of the high-pressure cylinder 1 is connected to the reheater input end of the moisture separator reheater 3, and the reheater output end of the moisture separator reheater 3 is simultaneously connected to the input ends of a plurality of low-pressure cylinders 2;

[0027] The system further includes an extraction device and multiple sets of heat exchange devices;

[0028] The extraction device is used to extract steam from the output end of the high-pressure cylinder 1 and send it into multiple sets of parallel heat exchange devices;

[0029] Each heat exchange device is used to heat the circulating water output by the heat users 11 in each region by using the received steam, and obtain the circulating water with heat to supply heat to the heat users 11 in each region.

[0030] Specifically, Figure 1 The high-pressure cylinder 1, multiple low-pressure cylinders 2, and the steam-water separation reheater 3 are components of an existing nuclear power steam turbine unit. A part of the steam is extracted from the output end of the high-pressure cylinder 1 as the heat source of the heat network to heat the heat network circulating water. The heated heat network circulating water passes through the heat exchange station in the heat exchange device and delivers the heat to the heat users.

[0031] Further define the composition of multiple heat exchange devices: Each heat exchange device includes a heat network heater 5, a cold-state heat network circulating water pipeline 6, a hot-state heat network circulating water pipeline 7, a heat exchange station 8, a cold-state secondary network heating pipeline 9, and a hot-state secondary network heating pipeline 10;

[0032] The steam input end of the heat network heater 5 is connected to the steam output end of the steam extraction device. The heating input end of the heat network heater 5 is connected to one end of the cold-state heat network circulating water pipeline 6. The heating output end of the heat network heater 5 is connected to the first input end of the heat exchange station 8. The first output end of the heat exchange station 8 is connected to the other end of the cold-state heat network circulating water pipeline 6. The second output end of the heat exchange station 8 is connected to the input end of the heat user 11. The output end of the heat user 11 is connected to one end of the cold-state secondary network heating pipeline 9. The other end of the cold-state secondary network heating pipeline 9 is connected to the second input end of the heat exchange station 8.

[0033] Specifically, as Figure 1 shown, the steam extraction device simultaneously sends steam into multiple heat exchange devices to supply heat to the heat users in multiple regions.

[0034] Further define the composition of the steam extraction device: The steam extraction device includes a heating steam pipeline 12, a heating steam pipeline safety valve 13, a heating steam pipeline pneumatic check valve 14, and a heating steam pipeline hydraulic quick closing valve 15;

[0035] One end of the heating steam pipeline 12 extracts steam from the output end of the high-pressure cylinder 1. The other end of the heating steam pipeline 12 is connected to the steam input end of the heat network heater 5. The heating steam pipeline safety valve 13, the heating steam pipeline pneumatic check valve 14, and the heating steam pipeline hydraulic quick closing valve 15 are all arranged on the heating steam pipeline 12.

[0036] Specifically, the steam extraction device further includes a heating steam pipeline electric shut-off valve 16 and a heating steam pipeline flowmeter 17;

[0037] The heating steam pipeline electric shut-off valve 16 and the heating steam pipeline flowmeter 17 are both arranged on the heating steam pipeline 12.

[0038] Working principle:

[0039] The high-power nuclear power steam turbine is equipped with a high-pressure cylinder 1 and three low-pressure cylinders 2. The main steam of the secondary circuit of the nuclear power plant passes through the steam-water separation reheater 3, is cooled by the exhaust steam of the high-pressure cylinder 1, and then enters the high-pressure cylinder 1 to do work. The exhaust steam of the high-pressure cylinder 1 passes through the steam-water separation reheater 3 and is heated by the main steam of the secondary circuit of the nuclear power plant, and then enters the three low-pressure cylinders 2 through the steam inlet quick opening valve 18 to do work.

[0040] In order to realize centralized heating, the steam source needs to be combined with the steam operation parameters and safety considerations of the unit, and a suitable extraction position should be reasonably selected. A method for realizing large-scale centralized heating is proposed for large-power nuclear power steam turbines: the heating extraction steam is taken from the high-pressure cylinder exhaust between the reference numerals 1 and 3, and is connected to the heating network heater 5 at the first station of the heating network in the nuclear power plant through the heating extraction interface 4. The heating steam pipeline is provided with a safety valve 13, a pneumatic check valve 14, a hydraulic fast pipe valve 15, an electric shut-off valve 16 and a flow meter 17.

[0041] The circulating water in the cold hot network circulating water pipeline 6 enters the hot network heater 5 and is heated by the heating steam extraction, then enters the hot hot network circulating water pipeline 7, brings the heat to the heat exchange station 8, and exchanges heat with the circulating water in the cold secondary network heating pipeline 9 before entering the hot network circulating water pipeline 6 again.

[0042] The circulating water of the secondary network heating network that obtains heat enters the hot secondary network heating pipe 10, brings the heat to the heat user 11, and then enters the cold secondary network heating pipe 9, and goes to the heat exchange station 8 for heat exchange again, thus completing the heating process.

[0043] 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 high-power nuclear power steam turbine heating system, the system comprising a nuclear power steam turbine unit, the nuclear power steam turbine unit comprising a high-pressure cylinder (1), a plurality of low-pressure cylinders (2) and a steam-water separation reheater (3); the steam input end of the steam-water separation reheater (3) is connected to the main steam of the nuclear power secondary circuit, the steam output end of the steam-water separation reheater (3) is connected to the input end of the high-pressure cylinder (1), the output end of the high-pressure cylinder (1) is connected to the reheat input end of the steam-water separation reheater (3), and the reheat output end of the steam-water separation reheater (3) is simultaneously connected to the input ends of the plurality of low-pressure cylinders (2); It is characterized in that The system also includes a steam extraction device and multiple sets of heat exchange devices; A steam extraction device, used for extracting steam from the output end of the high-pressure cylinder (1) and sending it to a plurality of parallel heat exchange devices; Each set of heat exchange devices is used to heat the circulating water output by the heat users (11) in each region using the received steam, so as to obtain circulating water with heat to provide heat for the heat users (11) in each region.

2. A high-power nuclear power steam turbine heating system according to claim 1, characterized in that: Each set of heat exchange devices comprises a heat network heater (5), a cold heat network circulating water pipeline (6), a hot heat network circulating water pipeline (7), a heat exchange station (8), a cold secondary network heating pipeline (9) and a hot secondary network heating pipeline (10); The steam input end of the heat network heater (5) is connected to the steam output end of the steam extraction device, the heating input end of the heat network heater (5) is connected to one end of a cold heat network circulating water pipeline (6), the heating output end of the heat network heater (5) is connected to a first input end of a heat exchange station (8), the first output end of the heat exchange station (8) is connected to the other end of the cold heat network circulating water pipeline (6), the second output end of the heat exchange station (8) is connected to the input end of a heat user (11), the output end of the heat user (11) is connected to one end of a cold secondary network heating pipeline (9), and the other end of the cold secondary network heating pipeline (9) is connected to the second input end of the heat exchange station (8).

3. A high-power nuclear power steam turbine heating system according to claim 1, characterized in that: The steam extraction device comprises a heating steam pipeline (12), a heating steam pipeline safety valve (13), a heating steam pipeline pneumatic check valve (14) and a heating steam pipeline hydraulic quick-pipe valve (15); One end of the heating steam pipeline (12) extracts steam from the output end of the high-pressure cylinder (1), and the other end of the heating steam pipeline (12) is connected to the steam input end of the heating network heater (5). The heating steam pipeline safety valve (13), the heating steam pipeline pneumatic check valve (14) and the heating steam pipeline hydraulic quick-pipe valve (15) are all arranged on the heating steam pipeline (12).

4. A high-power nuclear power steam turbine heating system according to claim 3, characterized in that: The steam extraction device also includes a heating steam pipeline electric shut-off valve (16) and a heating steam pipeline flow meter (17); The heating steam pipeline electric shut-off valve (16) and the heating steam pipeline flow meter (17) are both arranged on the heating steam pipeline (12).

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