Nuclear energy steam supply system and method

Abstract

The invention particularly relates to a nuclear energy steam supply system which comprises a nuclear power station, a heat source side loop, a working medium side loop, a steam user and a steam heat accumulator. The nuclear power station is connected with the heat source side loop, the working medium side loop is connected with the steam user and the steam heat accumulator, the steam heat accumulator is connected with the steam user, and the heat source side loop and the working medium side loop are mutually independent. The nuclear power station forms heating steam according to the peak load regulation requirement of the nuclear power station and sends the heating steam into a heat source side loop; the heat source side loop is used for heating the clean working medium in the working medium side loop to form condensed water and sending the condensed water into a nuclear power station secondary loop; the working medium side loop is used for heating the clean working medium in the working medium side loop to form clean steam meeting the steam parameter requirement of a steam user; the steam regenerator stores and releases clean steam that exceeds or is below the steam load demand of the steam user. According to the invention, peak load regulation of the nuclear power station and steam load regulation of the steam user are realized, and power grid operation safety and reactor operation safety are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive utilization of nuclear energy, and in particular to a nuclear energy steam supply system and method. Background Art

[0002] At present, nuclear power, as a non-fossil energy source, is not included in the national energy consumption and intensity regulation. The nuclear energy industry steam supply has the characteristics of stability and large supply, and is one of the inevitable choices for the large-scale development of the petrochemical industry. At present, the nuclear energy industry steam supply mainly uses pressurized water reactors to prepare low-pressure superheated steam or pressurized water reactors and high-temperature reactors to prepare medium-pressure superheated steam, and then transports it to users over long distances. The disadvantage of the current nuclear energy steam supply is that the load fluctuation on the user side will directly affect the reactor power or the turbine power generation power, affecting the safety of power grid operation and reactor operation.

[0003] On the other hand, as my country's electricity demand slows down, the peak-to-valley difference in load increases, and the proportion of renewable energy generation in the power system continues to increase, the peak load regulation situation of the power system is becoming more and more severe. Although the state supports the base load operation of nuclear power in terms of policy, the actual pressure of peak load regulation in the power system has been transmitted to the actual operation of nuclear power plants. Nuclear power units in coastal areas where nuclear power accounts for a relatively high proportion are facing more urgent peak load regulation operation needs.

[0004] Therefore, there is an urgent need for a nuclear energy steam supply system that takes into account both economy and system complexity and can effectively achieve peak load regulation of nuclear power plants and steam load regulation of steam users. Summary of the invention

[0005] The purpose of the present invention is to provide a nuclear energy steam supply system with load regulation function, which can realize peak load regulation of nuclear power plants and steam load regulation of steam users by reducing system complexity and operating in a highly economical manner, thereby ensuring the safe operation of the power grid and the reactor.

[0006] In order to solve the above problems, the present invention provides a nuclear energy steam supply system, which delivers clean steam that meets the steam load requirements and steam parameter requirements of steam users to steam users and meets the peak load requirements of nuclear power plants, including: a nuclear power plant, a heat source side loop, a working fluid side loop, a steam user and a steam accumulator; the nuclear power plant is connected to the heat source side loop, the working fluid side loop is respectively connected to the steam user and the steam accumulator, the steam accumulator is connected to the steam user, and the heat source side loop and the working fluid side loop are independent of each other;

[0007] The nuclear power plant is used to generate heating steam according to the peak load demand of the nuclear power plant and send it into the heat source side loop; the heat source side loop is used to use the input heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it into the secondary loop of the nuclear power plant; the working fluid side loop is used to heat the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user;

[0008] When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage;

[0009] When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator combines with the working fluid side loop to form clean steam lower than the steam load demand of the steam user and send it to the steam user.

[0010] Furthermore, the nuclear energy steam supply system includes: a superheater, a steam generator, a drain tank, a secondary preheater and a primary preheater; the superheater, the steam generator, the secondary preheater and the primary preheater are each provided with a tube side path and a shell side path isolated from each other; the shell side path of the superheater, the shell side path of the steam generator, the shell side path of the secondary preheater and the shell side path of the primary preheater are connected in sequence to form a working fluid side loop.

[0011] As one of the feasible ways, the heat source side loop is the first heat source side loop, the nuclear power plant is a pressurized water reactor nuclear power plant, and the steam user is a low-pressure steam user; the tube side path of the superheater, the tube side path of the steam generator, the drain tank, the tube side path of the secondary preheater and the tube side path of the primary preheater are connected in sequence to form the first heat source side loop; the shell side path of the superheater is respectively connected to the low-pressure steam user and the steam accumulator, and the steam accumulator is connected to the low-pressure steam user.

[0012] Furthermore, the working fluid side loop also includes: a deaerator and a secondary feed water pump; the deaerator is between the primary preheater and the secondary preheater, and the secondary feed water pump is between the deaerator and the secondary preheater.

[0013] Furthermore, the working fluid side circuit also includes: a desalted water tank and a primary water feed pump; the desalted water tank is connected to the shell side path of the primary preheater through the primary water feed pump.

[0014] As one of the feasible ways, the heat source side loop is a coupling of a second heat source measurement loop and a third heat source measurement loop, the nuclear power plant is a coupling of a pressurized water reactor nuclear power plant and a high temperature reactor nuclear power plant, the steam users include medium pressure steam users, the pressurized water reactor nuclear power plant is connected to the second heat source measurement loop, and the high temperature reactor nuclear power plant is connected to the third heat source side loop; the tube side path of the steam generator, the drain tank, the tube side path of the secondary preheater and the tube side path of the primary preheater are connected in sequence to form a second heat source side loop; the tube side path of the superheater is the third heat source side loop; the shell side path of the steam generator is respectively connected to the shell side path of the steam accumulator and the superheater; the shell side path of the superheater is respectively connected to the medium pressure steam user and the steam accumulator.

[0015] Furthermore, the working fluid side loop also includes: an electric heater; the electric heater is connected to the steam heat accumulator and the medium-pressure steam user respectively.

[0016] Furthermore, the steam users also include low-pressure steam users; the working fluid side loop also includes: a mixing tank; the shell side path of the steam generator, the steam accumulator, the shell side path of the superheater and the low-pressure steam users are also connected to the mixing tank.

[0017] Furthermore, the steam accumulator is a steam storage device or a heat storage device, which is selected according to the steam load of the regulated steam user and the peak load of the nuclear power plant.

[0018] In order to solve the above problems, the present invention also provides a nuclear energy steam supply method, which is suitable for delivering clean steam that meets the steam load requirements and steam parameter requirements of steam users to steam users according to any of the above nuclear energy steam supply systems, while meeting the peak load requirements of nuclear power plants, including the following steps:

[0019] The nuclear power plant generates heating steam according to the peak load demand of the nuclear power plant and sends it to the heat source side loop; the heat source side loop uses the sent heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it to the secondary loop of the nuclear power plant; the working fluid side loop heats the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user;

[0020] When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage;

[0021] When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator will generate clean steam lower than the steam load demand of the steam user and send it to the steam user.

[0022] Beneficial technical effects of the present invention:

[0023] The nuclear energy steam supply system and method of the present invention uses a steam accumulator to store clean steam that exceeds the steam load demand of steam users, combines with a working fluid side loop to form clean steam that is lower than the steam load demand of steam users, and delivers it to steam users, thereby achieving simultaneous regulation of the steam load of steam users and the peak load of nuclear power plants. The system has low system complexity and a highly economical operation mode, ensuring the safe operation of the power grid and the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of Embodiment 1 of the nuclear energy steam supply system of the present invention;

[0025] Figure 2 It is a structural schematic diagram of Embodiment 2 of the nuclear energy steam supply system of the present invention;

[0026] Figure 3 This is a schematic structural diagram of Example 3 of the nuclear energy steam supply system of the present invention. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] refer to Figure 1 , showing a schematic structural diagram of a nuclear energy steam supply system of this embodiment, the nuclear energy steam supply system delivers clean steam that meets the steam load requirements and steam parameter requirements of steam users to steam users while meeting the peak load requirements of nuclear power plants, including: a nuclear power plant, a heat source side loop, a working fluid side loop, a steam user and a steam accumulator; the nuclear power plant is connected to the heat source side loop, the working fluid side loop is respectively connected to the steam user and the steam accumulator, the steam accumulator is connected to the steam user, and the heat source side loop and the working fluid side loop are independent of each other;

[0032] The nuclear power plant is used to generate heating steam according to the peak load demand of the nuclear power plant and send it into the heat source side loop; the heat source side loop is used to use the input heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it into the secondary loop of the nuclear power plant; the working fluid side loop is used to heat the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user;

[0033] When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage;

[0034] When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator combines with the working fluid side loop to form clean steam lower than the steam load demand of the steam user and send it to the steam user.

[0035] The steam accumulator stores clean steam that exceeds the steam load demand of the steam users, and combines with the working fluid side loop to form clean steam that is lower than the steam load demand of the steam users, which is then delivered to the steam users, thereby achieving simultaneous regulation of the steam load of the steam users and the peak load of the nuclear power plant.

[0036] In this embodiment, the nuclear power plant is a pressurized water reactor nuclear power plant, the steam user is a low-pressure steam user, the heat source side loop is a first heat source side loop, the pressurized water reactor nuclear power plant is connected to the first heat source side loop, the working fluid side loop is respectively connected to the low-pressure steam user and the steam accumulator, and the steam accumulator is connected to the low-pressure steam user;

[0037] According to the peak load demand of the PWR nuclear power plant, the PWR nuclear power plant generates the secondary steam after the nuclear reaction and sends it to the first heat source side loop; the first heat source side loop uses the sent secondary steam of the PWR nuclear power plant as a heat source to heat the clean working fluid in the working fluid side loop to form condensate and send it to the secondary loop of the PWR nuclear power plant; the working fluid side loop heats the clean working fluid in the working fluid side loop to form low-pressure clean steam that meets the steam parameter requirements of the low-pressure steam user;

[0038] When the low-pressure clean steam formed in the working fluid side loop is not lower than the steam load demand of the low-pressure steam user, the working fluid side loop will send the low-pressure clean steam that meets the steam load demand of the low-pressure steam user to the low-pressure steam user, and send the low-pressure clean steam that exceeds the steam load demand of the low-pressure steam user to the steam accumulator for storage;

[0039] When the low-pressure clean steam formed in the working fluid side loop is lower than the steam load demand of the low-pressure steam user, the working fluid side loop will send the formed low-pressure clean steam to the low-pressure steam user, and the steam accumulator will send the low-pressure clean steam that is lower than the steam load demand of the low-pressure steam user to the low-pressure steam user.

[0040] The steam accumulator stores low-pressure clean steam that exceeds the steam load demand of low-pressure steam users, and delivers low-pressure clean steam that is lower than the steam load demand of low-pressure steam users to low-pressure steam users, thereby simultaneously regulating the steam load of low-pressure steam users and the peak load of pressurized water reactor nuclear power plants.

[0041] In this embodiment, the form of the secondary circuit steam of the PWR nuclear power plant is not limited, and it can be the main steam, high-pressure cylinder exhaust steam or medium- and low-pressure cylinder exhaust steam of the PWR nuclear power plant, or other forms of steam of the PWR nuclear power plant.

[0042] In this embodiment, the nuclear energy steam supply system includes: a superheater, a steam generator, a drain tank, a secondary preheater and a primary preheater; the superheater, the steam generator, the secondary preheater and the primary preheater are provided with mutually isolated tube side paths and shell side paths;

[0043] The tube side path of the superheater, the tube side path of the steam generator, the drain tank, the tube side path of the secondary preheater and the tube side path of the primary preheater are connected in sequence to form a first heat source side loop; the tube side path of the superheater and the tube side path of the primary preheater are respectively connected to the secondary loop of the pressurized water reactor nuclear power plant;

[0044] The shell side path of the superheater, the shell side path of the steam generator, the shell side path of the secondary preheater and the shell side path of the primary preheater are connected in sequence to form a working medium side loop; the shell side path of the superheater is connected to the low-pressure steam user and the steam accumulator respectively, and the steam accumulator is connected to the low-pressure steam user;

[0045] The heat source in the first heat source side loop passes through the heater, steam generator, drain tank, secondary preheater and primary preheater, and is cooled and condensed to form condensed water, which is sent to the secondary loop of the pressurized water reactor nuclear power plant; the clean working medium in the working medium side loop is preheated by the primary preheater, heated by the secondary preheater, evaporated by the steam generator and superheated by the superheater to form low-pressure clean steam that meets the steam parameter requirements of low-pressure steam users;

[0046] When the low-pressure clean steam generated by the superheater is not lower than the steam load demand of the low-pressure steam user, the superheater will send the low-pressure clean steam that meets the steam load demand of the low-pressure steam user to the low-pressure steam user, and send the low-pressure clean steam that exceeds the steam load demand of the low-pressure steam user to the steam accumulator for storage;

[0047] When the low-pressure clean steam generated by the superheater is lower than the steam load demand of the low-pressure steam user, the superheater will send the generated low-pressure clean steam to the low-pressure steam user, and the steam accumulator will send the low-pressure clean steam that is lower than the steam load demand of the low-pressure steam user to the low-pressure steam user;

[0048] The steam generator evaporates to form saturated clean steam which is sent to the superheater; the superheater superheats the saturated clean steam sent from the steam generator through the heat source in the first heat source side loop according to the steam parameter requirements of the low-pressure steam user, thereby increasing the pressure and / or temperature of the saturated clean steam sent from the steam generator to form low-pressure clean steam that meets the steam parameter requirements of the low-pressure steam user.

[0049] In order to ensure that the low-pressure clean steam sent to the low-pressure steam user is isolated from the first heat source side loop and does not contain radioactive substances, in this embodiment, the working fluid side loop also includes: a deaerator and a secondary feed water pump; the deaerator is between the primary preheater and the secondary preheater, and the secondary feed water pump is between the deaerator and the secondary preheater; the clean working fluid in the working fluid side loop is preheated by the primary preheater, deoxygenated by the deaerator, pressurized by the secondary feed water pump, heated by the secondary preheater, evaporated by the steam generator and superheated by the superheater to form low-pressure clean steam that meets the steam parameter requirements of the low-pressure steam user. The deaerator ensures that the low-pressure clean steam is isolated from the first heat source side loop and does not contain radioactive substances.

[0050] In this embodiment, the steam accumulator is provided with an inlet end and an outlet end opposite to each other, the inlet end of the steam accumulator is connected to the shell side path of the superheater, and the outlet end of the steam accumulator is connected to the low-pressure steam user.

[0051] In this embodiment, the steam accumulator is a steam storage device or a heat storage device; when the regulated steam load of the low-pressure steam user and the peak load of the pressurized water reactor nuclear power plant are small, the steam accumulator selects the steam storage device; when the regulated steam load of the low-pressure steam user and the peak load of the pressurized water reactor nuclear power plant are large, the steam accumulator selects the heat storage device; this enables the steam accumulator to regulate a wider range of low-pressure steam user steam loads and pressurized water reactor nuclear power plant peak loads.

[0052] In order to achieve uninterrupted nuclear energy steam supply, in this embodiment, the clean working fluid in the working fluid side loop is desalted water; the working fluid side loop also includes: a desalted water tank and a first-level feed water pump; the desalted water tank is connected to the shell side path of the first-level preheater through the first-level feed water pump, and is used to pressurize the desalted water into the working fluid side loop through the first-level feed water pump.

[0053] In this embodiment, the desalted water in the desalted water tank is provided by the desalted water system or the seawater desalination system of the pressurized water reactor nuclear power plant.

[0054] In this embodiment, the peak load demand of the pressurized water reactor nuclear power plant includes the peak load demand of the pressurized water reactor nuclear power plant and the stable period of the pressurized water reactor nuclear power plant, and the steam load demand of the low-pressure steam users includes the steam load decrease of the low-pressure steam users and the steam load increase of the low-pressure steam users; during the peak load period of the pressurized water reactor nuclear power plant or when the steam load of the low-pressure steam users decreases, the low-pressure clean steam formed by the working fluid side loop exceeds the steam load demand of the low-pressure steam users; during the stable period of the pressurized water reactor nuclear power plant or when the steam load of the low-pressure steam users increases, the low-pressure clean steam formed by the working fluid side loop is lower than the steam load demand of the low-pressure steam users.

[0055] The working principle of the nuclear energy steam supply system of this embodiment is as follows: according to the peak load demand of the pressurized water reactor nuclear power plant, the pressurized water reactor nuclear power plant generates a secondary circuit steam of the pressurized water reactor nuclear power plant after a nuclear reaction, and sends it into the first heat source side circuit as the heat source in the first heat source side circuit; the heat source in the first heat source side circuit is cooled and condensed to form condensed water after passing through the heater, steam generator, drain tank, secondary preheater and primary preheater, and sent to the secondary circuit of the pressurized water reactor nuclear power plant;

[0056] The desalted water tank pressurizes the desalted water into the working fluid side loop through the first-stage feedwater pump; the desalted water in the working fluid side loop is preheated by the first-stage preheater, deoxygenated by the deaerator, pressurized by the second-stage feedwater pump, heated by the second-stage preheater, evaporated by the steam generator and superheated by the superheater to form low-pressure clean steam that meets the steam parameter requirements of low-pressure steam users; the deaerator ensures that the low-pressure clean steam sent to the low-pressure steam user is isolated from the first heat source side loop and does not contain radioactive substances;

[0057] When the low-pressure clean steam generated by the superheater is not lower than the steam load demand of the low-pressure steam user, the superheater will send the low-pressure clean steam that meets the steam load demand of the low-pressure steam user to the low-pressure steam user, and send the low-pressure clean steam that exceeds the steam load demand of the low-pressure steam user to the steam accumulator for storage;

[0058] When the low-pressure clean steam generated by the superheater is lower than the steam load demand of the low-pressure steam user, the superheater will send the generated low-pressure clean steam to the low-pressure steam user, and the steam accumulator will send the low-pressure clean steam that is lower than the steam load demand of the low-pressure steam user to the low-pressure steam user;

[0059] The superheater superheats the saturated clean steam sent from the steam generator through the heat source in the first heat source side loop according to the steam parameter requirements of the low-pressure steam user, thereby increasing the pressure and / or temperature of the saturated clean steam sent from the steam generator to form low-pressure clean steam that meets the steam parameter requirements of the low-pressure steam user.

[0060] Example 2

[0061] refer to Figure 2 , showing a schematic structural diagram of a nuclear energy steam supply system of this embodiment, the nuclear energy steam supply system delivers clean steam that meets the steam load requirements and steam parameter requirements of steam users to steam users while meeting the peak load requirements of nuclear power plants, including: a nuclear power plant, a heat source side loop, a working fluid side loop, a steam user and a steam accumulator; the nuclear power plant is connected to the heat source side loop, the working fluid side loop is respectively connected to the steam user and the steam accumulator, the steam accumulator is connected to the steam user, and the heat source side loop and the working fluid side loop are independent of each other;

[0062] The nuclear power plant is used to generate heating steam according to the peak load demand of the nuclear power plant and send it into the heat source side loop; the heat source side loop is used to use the input heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it into the secondary loop of the nuclear power plant; the working fluid side loop is used to heat the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user;

[0063] When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage;

[0064] When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator combines with the working fluid side loop to form clean steam lower than the steam load demand of the steam user and send it to the steam user.

[0065] The steam accumulator stores clean steam that exceeds the steam load demand of the steam users, and combines with the working fluid side loop to form clean steam that is lower than the steam load demand of the steam users, which is then delivered to the steam users, thereby achieving simultaneous regulation of the steam load of the steam users and the peak load of the nuclear power plant.

[0066] In this embodiment, the heat source side loop includes a second heat source side loop and a third heat source side loop, the nuclear power plant includes a pressurized water reactor nuclear power plant and a high temperature reactor nuclear power plant, the steam user includes a medium-pressure steam user, the pressurized water reactor nuclear power plant is connected to the second heat source side loop, the high temperature reactor nuclear power plant is connected to the third heat source side loop, the working fluid side loop is respectively connected to the medium-pressure steam user and the steam accumulator, the steam accumulator is connected to the medium-pressure steam user, and the second heat source side loop and the third heat source side loop are respectively independent of the working fluid side loop;

[0067] According to the peak load demand of the PWR nuclear power plant, the secondary steam of the PWR nuclear power plant formed after the nuclear reaction is sent to the second heat source side loop; according to the peak load demand of the PWR nuclear power plant, the secondary steam of the PWR nuclear power plant formed after the nuclear reaction is sent to the third heat source side loop;

[0068] The second heat source side loop uses the steam from the secondary loop of the pressurized water reactor nuclear power plant as a heat source, heats the clean working fluid in the working fluid side loop to form condensate, and sends it to the secondary loop of the pressurized water reactor nuclear power plant; the third heat source side loop uses the steam from the secondary loop of the high temperature reactor nuclear power plant as a heat source, heats the clean working fluid in the working fluid side loop to form condensate, and sends it to the secondary loop of the high temperature reactor nuclear power plant; the working fluid side loop heats the clean working fluid in the working fluid side loop to form medium-pressure clean steam that meets the steam parameter requirements of medium-pressure steam users;

[0069] When the medium-pressure clean steam generated by the working fluid side loop is not lower than the steam load demand of the medium-pressure steam user, the working fluid side loop will send the medium-pressure clean steam that meets the steam load demand of the medium-pressure steam user to the medium-pressure steam user, and send the clean steam that exceeds the steam load demand of the medium-pressure steam user to the steam accumulator for storage;

[0070] When the medium-pressure clean steam formed in the working fluid side loop is lower than the steam load demand of the medium-pressure steam user, the working fluid side loop will send the formed medium-pressure clean steam to the medium-pressure steam user, and the steam accumulator cooperates with the working fluid side loop to form medium-pressure clean steam that is lower than the steam load demand of the medium-pressure steam user and send it to the medium-pressure steam user.

[0071] The steam accumulator stores clean steam that exceeds the steam load demand of medium-pressure steam users, and cooperates with the working fluid side circuit to form medium-pressure clean steam that is lower than the steam load demand of medium-pressure steam users, which is delivered to medium-pressure steam users, thereby achieving simultaneous regulation of the steam load of medium-pressure steam users, the peak load of pressurized water reactor nuclear power plants, and the peak load of high-temperature reactor nuclear power plants.

[0072] In this embodiment, the form of the secondary circuit steam of the pressurized water reactor nuclear power plant is not limited, and it can be the main steam, high-pressure cylinder exhaust steam, or medium- and low-pressure cylinder exhaust steam of the pressurized water reactor nuclear power plant, or other forms of steam of the pressurized water reactor nuclear power plant; the form of the secondary circuit steam of the high-temperature reactor nuclear power plant is not limited, and it can be the main steam, high-pressure cylinder exhaust steam, or medium- and low-pressure cylinder exhaust steam of the high-temperature reactor nuclear power plant, or other forms of steam of the high-temperature reactor nuclear power plant.

[0073] In this embodiment, the nuclear energy steam supply system includes: a superheater, a steam generator, a drain tank, a secondary preheater and a primary preheater; the superheater, the steam generator, the secondary preheater and the primary preheater are provided with mutually isolated tube side paths and shell side paths; the tube side path of the superheater is the third heat source side loop, and the tube side path of the superheater is connected to the secondary loop of the high temperature reactor nuclear power plant;

[0074] The tube side path of the steam generator, the drain tank, the tube side path of the secondary preheater and the tube side path of the primary preheater are connected in sequence to form a second heat source side loop; the tube side path of the steam generator and the tube side path of the primary preheater are respectively connected to the secondary loop of the pressurized water reactor nuclear power plant;

[0075] The shell side path of the superheater, the shell side path of the steam generator, the shell side path of the secondary preheater and the shell side path of the primary preheater are connected in sequence to form a working medium side loop; the shell side path of the superheater is connected to the medium pressure steam user;

[0076] The heat source in the second heat source side loop passes through the steam generator, drain tank, secondary preheater and primary preheater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the pressurized water reactor nuclear power plant; the heat source in the third heat source side loop passes through the preheater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the high temperature reactor nuclear power plant; the clean working fluid in the working fluid side loop is preheated by the primary preheater, heated by the secondary preheater and evaporated by the steam generator to form saturated clean steam;

[0077] When the saturated clean steam generated by the steam generator is not lower than the steam load demand of the medium-pressure steam user, the steam generator sends the saturated clean steam that meets the steam load demand of the medium-pressure steam user to the superheater, and sends the saturated clean steam that exceeds the steam load demand of the medium-pressure steam user to the steam accumulator for storage;

[0078] When the saturated clean steam generated by the steam generator is lower than the steam load demand of the medium-pressure steam user, the steam generator sends the generated saturated clean steam to the superheater, and the steam accumulator sends the saturated clean steam lower than the steam load demand of the medium-pressure steam user to the superheater;

[0079] The superheater superheats the saturated clean steam sent from the steam generator through the heat source in the third heat source side loop according to the steam parameter requirements of the medium-pressure steam user, thereby increasing the pressure and / or temperature of the saturated clean steam sent from the steam generator to form medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user.

[0080] In this embodiment, the working fluid side circuit also includes: an electric heater, the steam accumulator and the electric heater are both provided with an inlet end and an outlet end relative to each other, the inlet end of the steam accumulator is connected to the shell side path of the steam generator, the outlet end of the steam accumulator is respectively connected to the inlet end of the electric heater, the shell side path of the superheater and the inlet end of the mixing tank, and the outlet end of the electric heater is connected to the medium-pressure steam user;

[0081] When the saturated clean steam generated by the steam generator is lower than the steam load demand of the medium-pressure steam user, the steam generator sends the generated saturated clean steam to the superheater, and the steam accumulator sends the saturated clean steam lower than the steam load demand of the medium-pressure steam user to the electric heater;

[0082] The electric heater superheats the saturated clean steam sent into the steam accumulator according to the steam parameter requirements of the medium-pressure steam user, increases the pressure and / or temperature of the saturated clean steam sent into the steam accumulator, and forms medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user.

[0083] In order to ensure that the medium-pressure clean steam sent to the medium-pressure steam user is isolated from the heat source side loop and does not contain radioactive substances, in this embodiment, the working fluid side loop also includes: a deaerator and a secondary feed water pump; the deaerator is between the primary preheater and the secondary preheater, and the secondary feed water pump is between the deaerator and the secondary preheater; the clean working fluid in the working fluid side loop is preheated by the primary preheater, deoxygenated by the deaerator, pressurized by the secondary feed water pump, heated by the secondary preheater, evaporated by the steam generator and superheated by the superheater to form medium-pressure clean steam that meets the steam load demand of the medium-pressure steam user; the deaerator ensures that the medium-pressure clean steam is isolated from the heat source side loop and does not contain radioactive substances.

[0084] In this embodiment, as one of the feasible ways, the steam accumulator is a steam storage device or a heat storage device; when the adjusted steam load of medium-pressure steam users, the peak load of pressurized water reactor nuclear power plant and the peak load of high-temperature reactor nuclear power plant are small, the steam accumulator selects a steam storage device; when the adjusted steam load of medium-pressure steam users, the peak load of pressurized water reactor nuclear power plant and the peak load of high-temperature reactor nuclear power plant are large, the steam accumulator selects a heat storage device; in this way, the steam accumulator can adjust a wider range of medium-pressure steam users' steam loads, pressurized water reactor nuclear power plant peak loads and high-temperature reactor nuclear power plant peak loads.

[0085] In order to achieve uninterrupted nuclear energy steam supply, in this embodiment, the clean working fluid in the working fluid side loop is desalted water; the nuclear energy steam supply system also includes: a desalted water tank and a first-stage feed water pump; the desalted water tank is connected to the shell side path of the first-stage preheater through the first-stage feed water pump, and is used to deliver the desalted water into the working fluid side loop.

[0086] In this embodiment, the desalted water in the desalted water tank is provided by the desalted water system or the seawater desalination system of the nuclear power plant.

[0087] The working principle of the nuclear energy steam supply system of this embodiment is as follows: according to the peak load demand of the pressurized water reactor nuclear power plant, the pressurized water reactor nuclear power plant generates secondary steam after nuclear reaction, and is sent to the second heat source side loop as the heat source in the second heat source side loop; according to the peak load demand of the high temperature reactor nuclear power plant, the high temperature reactor nuclear power plant generates secondary steam after nuclear reaction, and is sent to the third heat source side loop as the heat source in the third heat source side loop;

[0088] The heat source in the second heat source side loop passes through the steam generator, drain tank, secondary preheater and primary preheater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the pressurized water reactor nuclear power plant; the heat source in the third heat source side loop passes through the heater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the high temperature reactor nuclear power plant;

[0089] The desalted water tank pressurizes the desalted water into the working fluid side loop through the primary feed water pump. The desalted water in the working fluid side loop is preheated by the primary preheater, deoxygenated by the deaerator, pressurized by the secondary feed water pump, heated by the secondary preheater and evaporated by the steam generator to form saturated clean steam. The deaerator ensures that the medium-pressure clean steam sent to the medium-pressure steam user is isolated from the heat source side loop and does not contain radioactive substances.

[0090] When the saturated clean steam generated by the steam generator is not lower than the steam load demand of the medium-pressure steam user, the steam generator sends the saturated clean steam that meets the steam load demand of the medium-pressure steam user to the superheater, and sends the saturated clean steam that exceeds the steam load demand of the medium-pressure steam user to the steam accumulator for storage;

[0091] When the saturated clean steam generated by the steam generator is lower than the steam load demand of the medium-pressure steam user, the steam generator sends the generated saturated clean steam to the superheater, and the steam accumulator sends the saturated clean steam lower than the steam load demand of the medium-pressure steam user to the superheater or electric heater;

[0092] The superheater superheats the saturated clean steam sent from the steam generator through the heat source in the third heat source side loop according to the steam parameter requirements of the medium-pressure steam user, thereby increasing the pressure and / or temperature of the saturated clean steam sent from the steam generator to form medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user;

[0093] The electric heater superheats the saturated clean steam sent into the steam accumulator according to the steam parameter requirements of the medium-pressure steam user, increases the pressure and / or temperature of the saturated clean steam sent into the steam accumulator, and forms medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user.

[0094] In this embodiment, the peak load demand of the pressurized water reactor nuclear power plant includes the peak load demand of the pressurized water reactor nuclear power plant and the stable period of the pressurized water reactor nuclear power plant, the peak load demand of the high temperature reactor nuclear power plant includes the peak load demand of the high temperature reactor nuclear power plant and the stable period of the high temperature reactor nuclear power plant, and the steam load demand of the medium-pressure steam users includes the steam load decrease of the medium-pressure steam users and the steam load increase of the medium-pressure steam users; during the peak load demand of the pressurized water reactor nuclear power plant, the peak load demand of the high temperature reactor nuclear power plant or when the steam load of the medium-pressure steam users decreases, the medium-pressure clean steam formed by the working fluid side loop exceeds the steam load demand of the medium-pressure steam users; during the stable period of the pressurized water reactor nuclear power plant, the stable period of the high temperature reactor nuclear power plant or when the steam load of the medium-pressure steam users increases, the medium-pressure clean steam formed by the working fluid side loop is lower than the steam load demand of the medium-pressure steam users.

[0095] Example 3

[0096] refer to Figure 3, showing a schematic structural diagram of a nuclear energy steam supply system of this embodiment, the nuclear energy steam supply system delivers clean steam that meets the steam load requirements and steam parameter requirements of steam users to steam users while meeting the peak load requirements of nuclear power plants, including: a nuclear power plant, a heat source side loop, a working fluid side loop, a steam user and a steam accumulator; the nuclear power plant is connected to the heat source side loop, the working fluid side loop is respectively connected to the steam user and the steam accumulator, the steam accumulator is connected to the steam user, and the heat source side loop and the working fluid side loop are independent of each other;

[0097] The nuclear power plant is used to generate heating steam according to the peak load demand of the nuclear power plant and send it into the heat source side loop; the heat source side loop is used to use the input heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it into the secondary loop of the nuclear power plant; the working fluid side loop is used to heat the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user;

[0098] When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage;

[0099] When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator cooperates with the working fluid side loop to form clean steam lower than the steam load demand of the steam user and send it to the steam user.

[0100] The steam accumulator stores clean steam that exceeds the steam load demand of the steam users, and cooperates with the working fluid side loop to form clean steam that is lower than the steam load demand of the steam users, which is delivered to the steam users, thereby achieving simultaneous regulation of the steam load of the steam users and the peak load of the nuclear power plant.

[0101] In this embodiment, the heat source side loop includes a second heat source side loop and a third heat source side loop, the nuclear power plant includes a pressurized water reactor nuclear power plant and a high temperature reactor nuclear power plant, the steam users include medium-pressure steam users and low-pressure steam users, the pressurized water reactor nuclear power plant is connected to the second heat source side loop, the high temperature reactor nuclear power plant is connected to the third heat source side loop, the working fluid side loop is respectively connected to the low-pressure steam user, the medium-pressure steam user and the steam accumulator, the steam accumulator is respectively connected to the low-pressure steam user and the medium-pressure steam user, and the second heat source side loop and the third heat source side loop are respectively independent of the working fluid side loop;

[0102] According to the peak load demand of the PWR nuclear power plant, the secondary steam of the PWR nuclear power plant formed after the nuclear reaction is sent to the second heat source side loop; according to the peak load demand of the PWR nuclear power plant, the secondary steam of the PWR nuclear power plant formed after the nuclear reaction is sent to the third heat source side loop;

[0103] The second heat source side loop uses the steam from the secondary loop of the pressurized water reactor nuclear power plant as a heat source, heats the clean working fluid in the working fluid side loop to form condensate, and sends it to the secondary loop of the pressurized water reactor nuclear power plant; the third heat source side loop uses the steam from the secondary loop of the high temperature reactor nuclear power plant as a heat source, heats the clean working fluid in the working fluid side loop to form condensate, and sends it to the secondary loop of the high temperature reactor nuclear power plant; the working fluid side loop heats the clean working fluid in the working fluid side loop to form low-pressure clean steam that meets the steam parameter requirements of low-pressure steam users and medium-pressure clean steam that meets the steam parameter requirements of medium-pressure steam users;

[0104] When the low-pressure clean steam formed by the working fluid side loop is not lower than the steam load demand of the low-pressure steam user, the working fluid side loop will send the low-pressure clean steam that meets the steam load demand of the low-pressure steam user to the low-pressure steam user, and send the clean steam that exceeds the steam load demand of the low-pressure steam user to the steam accumulator for storage; when the medium-pressure clean steam formed by the working fluid side loop is not lower than the steam load demand of the medium-pressure steam user, the working fluid side loop will send the medium-pressure clean steam that meets the steam load demand of the medium-pressure steam user to the medium-pressure steam user, and send the clean steam that exceeds the steam load demand of the medium-pressure steam user to the steam accumulator for storage;

[0105] When the low-pressure clean steam formed in the working fluid side loop is lower than the steam load demand of the low-pressure steam user, the working fluid side loop will send the formed low-pressure clean steam to the low-pressure steam user, and the steam accumulator cooperates with the working fluid side loop to form low-pressure clean steam lower than the steam load demand of the low-pressure steam user and sends it to the low-pressure steam user; when the medium-pressure clean steam formed in the working fluid side loop is lower than the steam load demand of the medium-pressure steam user, the working fluid side loop will send the formed medium-pressure clean steam to the medium-pressure steam user, and the steam accumulator cooperates with the working fluid side loop to form medium-pressure clean steam lower than the steam load demand of the medium-pressure steam user and sends it to the medium-pressure steam user.

[0106] The steam accumulator stores clean steam that exceeds the steam load demand of low-pressure steam users and clean steam that meets the steam load demand of medium-pressure steam users, and cooperates with the working fluid side loop to form low-pressure clean steam that is lower than the steam load demand of low-pressure steam users, which is delivered to low-pressure steam users. It also cooperates with the working fluid side loop to form medium-pressure clean steam that is lower than the steam load demand of medium-pressure steam users, which is delivered to medium-pressure steam users, thereby achieving simultaneous regulation of the steam load of low-pressure steam users, the steam load of medium-pressure steam users, the peak load of pressurized water reactor nuclear power plants, and the peak load of high-temperature reactor nuclear power plants.

[0107] In this embodiment, the form of the secondary circuit steam of the pressurized water reactor nuclear power plant is not limited, and it can be the main steam, high-pressure cylinder exhaust steam, or medium- and low-pressure cylinder exhaust steam of the pressurized water reactor nuclear power plant, or other forms of steam of the pressurized water reactor nuclear power plant; the form of the secondary circuit steam of the high-temperature reactor nuclear power plant is not limited, and it can be the main steam, high-pressure cylinder exhaust steam, or medium- and low-pressure cylinder exhaust steam of the high-temperature reactor nuclear power plant, or other forms of steam of the high-temperature reactor nuclear power plant.

[0108] In this embodiment, the nuclear energy steam supply system includes: a superheater, a steam generator, a drain tank, a secondary preheater, a primary preheater and a mixing tank; the superheater, the steam generator, the secondary preheater and the primary preheater are provided with mutually isolated tube side paths and shell side paths; the tube side path of the superheater is the third heat source side loop, and the tube side path of the superheater is connected to the secondary loop of the high temperature reactor nuclear power plant;

[0109] The tube side path of the steam generator, the drain tank, the tube side path of the secondary preheater and the tube side path of the primary preheater are connected in sequence to form a second heat source side loop; the tube side path of the steam generator and the tube side path of the primary preheater are respectively connected to the secondary loop of the pressurized water reactor nuclear power plant;

[0110] The shell side path of the superheater, the shell side path of the steam generator, the shell side path of the secondary preheater and the shell side path of the primary preheater, as well as the shell side path of the superheater and the shell side path of the steam generator connected in sequence are respectively connected to the mixing tank to form a working medium side loop; the shell side path of the superheater is connected to the medium pressure steam user, and the mixing tank is connected to the low pressure steam user;

[0111] The heat source in the second heat source side loop passes through the steam generator, drain tank, secondary preheater and primary preheater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the pressurized water reactor nuclear power plant; the heat source in the third heat source side loop passes through the preheater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the high temperature reactor nuclear power plant; the clean working fluid in the working fluid side loop is preheated by the primary preheater, heated by the secondary preheater, and evaporated by the steam generator to form saturated clean steam;

[0112] When the saturated clean steam generated by the steam generator is not less than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user, the steam generator sends part of the saturated clean steam to the superheater, sends part of the saturated clean steam to the mixing tank, and sends the remaining part of the saturated clean steam to the steam accumulator for storage;

[0113] When the saturated clean steam generated by the steam generator is lower than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user, the steam generator sends the generated saturated clean steam to the mixing tank and / or the superheater, and the steam accumulator sends the saturated clean steam lower than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user to the mixing tank and / or the superheater;

[0114] The superheater superheats the saturated clean steam sent from the steam generator and / or the steam accumulator through the heat source in the third heat source side loop according to the steam parameter requirements of the medium-pressure steam user, thereby increasing the pressure and / or temperature of the saturated clean steam sent from the steam generator to form medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user; among the medium-pressure clean steam formed by the superheater, the medium-pressure clean steam that meets the steam load requirements of the medium-pressure steam user is sent to the medium-pressure steam user, and the medium-pressure clean steam that exceeds the steam load requirements of the medium-pressure steam user is sent to the mixing tank;

[0115] The mixing tank mixes the saturated clean steam sent from the steam generator and / or the steam accumulator and the medium-pressure clean steam sent from the superheater according to the steam parameter requirements of the low-pressure steam users, to form low-pressure clean steam that meets the steam parameter requirements of the low-pressure steam users; among the low-pressure clean steam formed in the mixing tank, the low-pressure clean steam that meets the steam load requirements of the low-pressure steam users is sent to the low-pressure steam users, and the low-pressure clean steam that exceeds the steam load requirements of the low-pressure steam users is sent to the steam accumulator for storage.

[0116] In this embodiment, the working fluid side circuit also includes: an electric heater, the steam accumulator, the mixing tank and the electric heater are all provided with relative inlet and outlet ends, the inlet end of the steam accumulator is respectively connected to the shell side path of the steam generator and the outlet end of the mixing tank, the outlet end of the steam accumulator is respectively connected to the inlet end of the electric heater, the shell side path of the superheater and the inlet end of the mixing tank; the inlet end of the mixing tank is respectively connected to the shell side path of the steam generator and the shell side path of the superheater, the outlet end of the mixing tank is connected to the low-pressure steam user, and the outlet end of the electric heater is respectively connected to the medium-pressure steam user and the superheater;

[0117] When the saturated clean steam generated by the steam generator is lower than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user, the steam accumulator sends the saturated clean steam lower than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user to the electric heater;

[0118] The electric heater superheats the saturated clean steam sent from the steam accumulator according to the steam parameter requirements of the medium-pressure steam user, increases the pressure and / or temperature of the saturated clean steam sent from the steam accumulator, and forms medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user; of the sum of the medium-pressure clean steam formed by the electric heater and the medium-pressure clean steam formed by the superheater, the medium-pressure clean steam that meets the steam load requirements of the medium-pressure steam user is sent to the medium-pressure steam user, and the medium-pressure clean steam that exceeds the steam load requirements of the medium-pressure steam user is sent to the mixing tank.

[0119] In order to ensure that the low-pressure clean steam sent to the low-pressure steam users and the medium-pressure clean steam sent to the medium-pressure steam users are isolated from the heat source side loop and do not contain radioactive substances, in this embodiment, the working fluid side loop also includes: a deaerator and a secondary feed water pump; the deaerator is between the primary preheater and the secondary preheater, and the secondary feed water pump is between the deaerator and the secondary preheater; the clean working fluid in the working fluid side loop is preheated by the primary preheater, deoxygenated by the deaerator, pressurized by the secondary feed water pump, heated by the secondary preheater and evaporated by the steam generator to form saturated clean steam; the deaerator ensures that the low-pressure clean steam and the medium-pressure clean steam are isolated from the heat source side loop and do not contain radioactive substances.

[0120] In this embodiment, the steam accumulator is a steam storage device or a heat storage device; when the regulated steam load of low-pressure steam users, medium-pressure steam users, pressurized water reactor nuclear power plant peak load and high-temperature reactor nuclear power plant peak load are small, the steam accumulator selects a steam storage device; when the regulated steam load of low-pressure steam users, medium-pressure steam users, pressurized water reactor nuclear power plant peak load and high-temperature reactor nuclear power plant peak load are large, the steam accumulator selects a heat storage device; in this way, the steam accumulator can regulate a wider range of low-pressure steam user steam loads, medium-pressure steam user steam loads, pressurized water reactor nuclear power plant peak loads and high-temperature reactor nuclear power plant peak loads.

[0121] In order to achieve uninterrupted nuclear energy steam supply, in this embodiment, the clean working fluid in the working fluid side loop is desalted water; the working fluid side loop also includes: a desalted water tank and a first-stage feed water pump; the desalted water tank is connected to the shell side path of the first-stage preheater through the first-stage feed water pump, which is used to deliver the desalted water into the working fluid side loop.

[0122] In this embodiment, the desalted water in the desalted water tank is provided by the desalted water system or the seawater desalination system of the nuclear power plant.

[0123] The working principle of the nuclear energy steam supply system of this embodiment is as follows: according to the peak load demand of the pressurized water reactor nuclear power plant, the pressurized water reactor nuclear power plant generates secondary steam after nuclear reaction, and is sent to the second heat source side loop as the heat source in the second heat source side loop; according to the peak load demand of the high temperature reactor nuclear power plant, the high temperature reactor nuclear power plant generates secondary steam after nuclear reaction, and is sent to the third heat source side loop as the heat source in the third heat source side loop;

[0124] The heat source in the second heat source side loop passes through the steam generator, drain tank, secondary preheater and primary preheater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the pressurized water reactor nuclear power plant; the heat source in the third heat source side loop passes through the heater, and is cooled and condensed to form condensed water, which is then sent to the secondary loop of the high temperature reactor nuclear power plant;

[0125] The desalted water tank pressurizes the desalted water into the working fluid side loop through the primary feed water pump. The desalted water in the working fluid side loop is preheated by the primary preheater, deoxygenated by the deaerator, pressurized by the secondary feed water pump, heated by the secondary preheater and evaporated by the steam generator to form saturated clean steam. The deaerator ensures that the low-pressure clean steam sent to the low-pressure steam users and the medium-pressure clean steam sent to the medium-pressure steam users are isolated from the heat source side loop and do not contain radioactive substances.

[0126] When the saturated clean steam generated by the steam generator is not less than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user, the steam generator sends part of the saturated clean steam to the superheater, sends part of the saturated clean steam to the mixing tank, and sends the remaining part of the saturated clean steam to the steam accumulator for storage;

[0127] When the saturated clean steam generated by the steam generator is lower than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user, the steam generator sends the generated saturated clean steam to the mixing tank and / or the superheater, and the steam accumulator sends the saturated clean steam lower than the sum of the steam load demand of the medium-pressure steam user and the steam load demand of the low-pressure steam user to the mixing tank and / or the superheater and / or the electric heater;

[0128] The superheater superheats the saturated clean steam sent from the steam generator and / or the steam accumulator through the heat source in the third heat source side loop according to the steam parameter requirements of the medium-pressure steam user, thereby increasing the pressure and / or temperature of the saturated clean steam sent from the steam generator to form medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user; among the medium-pressure clean steam formed by the superheater, the medium-pressure clean steam that meets the steam load requirements of the medium-pressure steam user is sent to the medium-pressure steam user, and the medium-pressure clean steam that exceeds the steam load requirements of the medium-pressure steam user is sent to the mixing tank;

[0129] The electric heater superheats the saturated clean steam sent from the steam accumulator according to the steam parameter requirements of the medium-pressure steam user, increases the pressure and / or temperature of the saturated clean steam sent from the steam accumulator, and forms medium-pressure clean steam that meets the steam parameter requirements of the medium-pressure steam user; of the sum of the medium-pressure clean steam formed by the electric heater and the medium-pressure clean steam formed by the superheater, the medium-pressure clean steam that meets the steam load requirements of the medium-pressure steam user is sent to the medium-pressure steam user, and the medium-pressure clean steam that exceeds the steam load requirements of the medium-pressure steam user is sent to the mixing tank;

[0130] The mixing tank mixes the clean steam sent from the steam generator and / or the steam accumulator and the medium-pressure clean steam sent from the superheater or the electric heater according to the steam parameter requirements of the low-pressure steam users, to form low-pressure clean steam that meets the steam parameter requirements of the low-pressure steam users; among the low-pressure clean steam formed in the mixing tank, the low-pressure clean steam that meets the steam load requirements of the low-pressure steam users is sent to the low-pressure steam users, and the low-pressure clean steam that exceeds the steam load requirements of the low-pressure steam users is sent to the steam accumulator for storage.

[0131] In this embodiment, the peak load demand of the pressurized water reactor nuclear power plant includes the peak load demand of the pressurized water reactor nuclear power plant and the stable period of the pressurized water reactor nuclear power plant, the peak load demand of the high temperature reactor nuclear power plant includes the peak load demand of the high temperature reactor nuclear power plant and the stable period of the high temperature reactor nuclear power plant, the steam load demand of the medium pressure steam users includes the steam load decrease of the medium pressure steam users and the steam load increase of the medium pressure steam users, and the steam load demand of the low pressure steam users includes the steam load decrease of the low pressure steam users and the steam load increase of the low pressure steam users.

[0132] During the peak-shaving period of a pressurized water reactor nuclear power plant, the peak-shaving period of a high-temperature reactor nuclear power plant, when the steam load of low-pressure steam users decreases, or the steam load of medium-pressure steam users decreases, the clean steam formed in the working fluid side loop exceeds the steam load demand of the steam users; during the stable period of a pressurized water reactor nuclear power plant, the stable period of a high-temperature reactor nuclear power plant, when the steam load of low-pressure steam users decreases, or the steam load of medium-pressure steam users increases, the clean steam formed in the working fluid side loop is lower than the steam load demand of the steam users.

[0133] Example 4

[0134] This embodiment provides a nuclear energy steam supply method, which is applicable to the nuclear energy steam supply system according to any embodiment to deliver clean steam that meets the steam load requirements and steam parameter requirements of the steam user to the steam user while meeting the peak load requirements of the nuclear power plant, including the following steps:

[0135] The nuclear power plant generates heating steam according to the peak load demand of the nuclear power plant and sends it to the heat source side loop; the heat source side loop uses the sent heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it to the secondary loop of the nuclear power plant; the working fluid side loop heats the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user;

[0136] When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage;

[0137] When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator will generate clean steam lower than the steam load demand of the steam user and send it to the steam user.

[0138] It should be noted that, according to the structure of the nuclear energy steam supply system and the differences in steam users, the nuclear energy steam supply system can be divided into a nuclear energy steam supply system based on a pressurized water reactor nuclear power plant and a nuclear energy steam supply system based on a pressurized water reactor nuclear power plant and a high-temperature reactor nuclear power plant. Steam users can be divided into medium-pressure steam users and low-pressure steam users. Based on different steam parameter requirements and actual application scenario configurations, in some variant embodiments based on the embodiments, the structure of the nuclear energy schedule system can be further adaptively adjusted.

[0139] Consider whether to add electric heaters based on the scale and economy of producing superheated steam; when the amount of superheated steam produced is large, the heat source in the second heat source measurement circuit is used for superheating first; when the amount of superheated steam produced is small, such as the amount of superheated steam within the fluctuation range of steam load, electric heaters are used for superheating first. Based on the steam parameter requirements of steam users, while considering the complexity of the system and high economic operation, it is preferred to add electric heaters to better meet the steam parameter requirements under different working conditions.

[0140] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A nuclear energy steam supply system, characterized in that: include: Nuclear power plant, heat source side loop, working fluid side loop, steam user and steam accumulator; the nuclear power plant is connected to the heat source side loop, the working fluid side loop is respectively connected to the steam user and the steam accumulator, the steam accumulator is connected to the steam user, and the heat source side loop and the working fluid side loop are independent of each other; The nuclear power plant is used to generate heating steam according to the peak load demand of the nuclear power plant and send it into the heat source side loop; the heat source side loop is used to use the input heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it into the secondary loop of the nuclear power plant; the working fluid side loop is used to heat the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user; When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage; When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator combines with the working fluid side loop to form clean steam lower than the steam load demand of the steam user and send it to the steam user.

2. The nuclear energy steam supply system according to claim 1, characterized in that: include: Superheater, steam generator, drain tank, secondary preheater and primary preheater; the superheater, steam generator, secondary preheater and primary preheater are all provided with mutually isolated tube side paths and shell side paths; the shell side path of the superheater, the shell side path of the steam generator, the shell side path of the secondary preheater and the shell side path of the primary preheater are connected in sequence to form a working fluid side loop.

3. The nuclear energy steam supply system according to claim 2, characterized in that: The heat source side loop is the first heat source test loop, the nuclear power plant is a pressurized water reactor nuclear power plant, and the steam user is a low-pressure steam user; the tube side path of the superheater, the tube side path of the steam generator, the drain tank, the tube side path of the secondary preheater and the tube side path of the primary preheater are connected in sequence to form the first heat source side loop; the shell side path of the superheater is respectively connected to the low-pressure steam user and the steam accumulator, and the steam accumulator is connected to the low-pressure steam user.

4. The nuclear energy steam supply system according to claim 2, characterized in that: The working fluid side loop also includes: a deaerator and a secondary feed water pump; the deaerator is between the primary preheater and the secondary preheater, and the secondary feed water pump is between the deaerator and the secondary preheater.

5. The nuclear energy steam supply system according to claim 2, characterized in that: The working fluid side circuit also includes: a desalted water tank and a primary water feed pump; the desalted water tank is connected to the shell side path of the primary preheater through the primary water feed pump.

6. The nuclear energy steam supply system according to claim 2, characterized in that: The heat source side loop is a coupling of the second heat source measurement loop and the third heat source measurement loop, the nuclear power plant is a coupling of a pressurized water reactor nuclear power plant and a high temperature reactor nuclear power plant, the steam users include medium-pressure steam users, the pressurized water reactor nuclear power plant is connected to the second heat source measurement loop, and the high temperature reactor nuclear power plant is connected to the third heat source side loop; the tube side path of the steam generator, the drain tank, the tube side path of the secondary preheater and the tube side path of the primary preheater are connected in sequence to form the second heat source side loop; the tube side path of the superheater is the third heat source side loop; the shell side path of the steam generator is respectively connected to the steam accumulator and the shell side path of the superheater; the shell side path of the superheater is respectively connected to the medium-pressure steam user and the steam accumulator.

7. The nuclear energy steam supply system according to claim 6, characterized in that: The working fluid side loop also includes: an electric heater; the electric heater is connected to the steam heat accumulator and the medium-pressure steam user respectively.

8. The nuclear energy steam supply system according to claim 6, characterized in that: The steam users also include low-pressure steam users; the working fluid side loop also includes: a mixing tank; the shell side path of the steam generator, the steam accumulator, the shell side path of the superheater and the low-pressure steam users are also connected to the mixing tank.

9. The nuclear energy steam supply system according to claim 1, characterized in that: The steam accumulator is a steam storage device or a heat storage device, which is selected according to the steam load of the regulated steam user and the peak load of the nuclear power plant.

10. A nuclear energy steam supply method, applicable to the nuclear energy steam supply system according to any one of claims 1 to 9, supplying clean steam to steam users that meets the steam load requirements and steam parameter requirements of steam users while meeting the peak load requirements of nuclear power plants, comprising the following steps: The nuclear power plant generates heating steam according to the peak load demand of the nuclear power plant and sends it to the heat source side loop; the heat source side loop uses the sent heating steam as a heat source to heat the clean working fluid in the working fluid side loop to form condensed water and send it to the secondary loop of the nuclear power plant; the working fluid side loop heats the clean working fluid in the working fluid side loop to form clean steam that meets the steam parameter requirements of the steam user; When the clean steam generated by the working fluid side loop is not less than the steam load demand of the steam user, the working fluid side loop will send the clean steam that meets the steam load demand of the steam user to the steam user, and send the clean steam that exceeds the steam load demand of the steam user to the steam accumulator for storage; When the clean steam generated by the working fluid side loop is lower than the steam load demand of the steam user, the working fluid side loop will send the formed clean steam to the steam user, and the steam accumulator will generate clean steam lower than the steam load demand of the steam user and send it to the steam user.

Images