NUCLEAR STEAM SUPPLY SYSTEM AND METHOD

Abstract

NUCLEAR STEAM SUPPLY SYSTEM AND METHOD This disclosure relates to a nuclear steam supply system, comprising: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer, and a steam heat accumulator, where the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other. This disclosure allows for peak levelling load adjustment of the nuclear power plant and steam load adjustment of the steam consumer, while ensuring the operational safety of an electrical grid and a reactor. Summary figure: Fig. 1

Description

Title of the invention: NUCLEAR STEAM SUPPLY SYSTEM AND METHOD technical field

[0001] This disclosure relates to the technical field of the overall use of nuclear energy, and more particularly, to a system and a method for supplying nuclear steam. STATE OF THE ART

[0002] Currently, nuclear power, as a non-fossil fuel energy source, is not included in China's total energy consumption and intensity regulation. Nuclear-powered industrial steam supply offers the advantages of stability and high supply capacity, making it an inevitable choice for the large-scale development of the petrochemical industry. Currently, nuclear-powered industrial steam supply primarily produces low-pressure superheated steam using a pressurized water reactor or intermediate-pressure superheated steam by coupling a pressurized water reactor with a high-temperature reactor. The low-pressure or intermediate-pressure superheated steam is then transported over long distances to end users.The current disadvantage of nuclear steam power is that load fluctuations on the user side directly affect the reactor power or the power generated by the steam turbine, thus affecting the operational safety of an electrical grid and a reactor.

[0003] Furthermore, as electricity demand in China slows, the load differential between peak and off-peak periods continues to widen, and the proportion of renewable energy generation in the power system continues to grow, the need for peak leveling in the power system becomes increasingly acute. Although Chinese policy supports the operation of nuclear power plants at baseload capacity, the actual pressure of regulating the power system's peak leveling load has impacted the effective operation of nuclear power plants. Nuclear power generation units in coastal regions where the share of nuclear energy is relatively high face an urgent need for peak leveling operations.Therefore, it is urgent to have a nuclear steam supply system capable of effectively implementing peak load levelling regulation for a nuclear power plant and steam load regulation for a steam consumer, while taking into account the economics and complexity of the system. SUMMARY

[0004] An objective of the present disclosure is to provide a nuclear steam supply system with a load regulation function, which achieves peak leveling load regulation of a nuclear power plant and steam load regulation of a steam consumer in such a way as to reduce system complexity and achieve high economic operation, and ensures the operational safety of an electrical network and a reactor.

[0005] To solve the above problem, the present disclosure provides a nuclear steam supply system, which provides clean steam meeting a steam load requirement and a steam parameter requirement from a steam consumer to the steam consumer and meets a peak leveling load requirement of a nuclear power plant, comprising: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer and a steam heat accumulator, where the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other; The nuclear power plant is configured to generate heating steam and supply the heating steam to the heat source circuit according to the peak load levelling requirement of the nuclear power plant; the heat source circuit is configured to take the supplied heating steam as a heat source, heat a clean working fluid in the working fluid circuit to generate condensate and supply the condensate to a secondary circuit of the nuclear power plant; the working fluid circuit is configured to heat the clean working fluid in the working fluid circuit to generate clean steam meeting the steam consumer's steam parameter requirement; in a case where the clean steam formed by the working fluid circuit is not less than the steam load requirement of the steam consumer, the working fluid circuit supplies the steam consumer with clean steam meeting the steam consumer's load requirement, and supplies the steam heat accumulator with clean steam exceeding the consumer's load requirement for storage; and In a case where the clean steam formed by the working fluid circuit is less than the load requirement of the consumer, the working fluid circuit supplies the clean steam formed to the steam consumer, and the steam heat accumulator is combined with the working fluid circuit to form a steam owns less than the steam consumer's requirement and supplies steam to the steam consumer.

[0006] In addition, the nuclear steam supply system includes a superheater, a steam generator, a drain tank, a secondary preheater and a primary preheater, where a mutually insulated tube-side path and a shell-side path are disposed in each of the superheater, steam generator, secondary preheater and primary preheater; and 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 connected in sequence form the working fluid circuit.

[0007] In one embodiment, the heat source circuit is a first heat source circuit, the nuclear power plant is a pressurized water reactor nuclear power plant, and the steam consumer is a low-pressure steam consumer; the superheater tube-side path, the steam generator tube-side path, the drain tank, the secondary preheater tube-side path and the primary preheater tube-side path connected in sequence form the first heat source circuit; and the superheater shell-side path is connected to the low-pressure steam consumer and the steam heat accumulator, and the steam heat accumulator is connected to the low-pressure steam consumer.

[0008] In addition, the working fluid circuit includes: a degasser and a secondary water supply pump, where the degasser is disposed between the primary preheater and the secondary preheater, and the pump is disposed between the degasser and the secondary preheater.

[0009] In addition, the working fluid circuit includes: a demineralized water tank and a primary water supply pump, where the demineralized water tank is connected to the hull-side path of the primary preheater by the primary water supply pump.

[0010] In one embodiment, the heat source circuit is formed by coupling a second heat source circuit and a third heat source circuit; the nuclear power plant is formed by coupling a pressurized water reactor nuclear power plant and a high-temperature reactor nuclear power plant; the steam consumer comprises a medium-pressure steam consumer; the pressurized water reactor nuclear power plant is connected to the second heat source circuit, and the high-temperature reactor nuclear power plant is connected to the third heat source circuit; 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 connected in sequence form the second circuit of heat source; the tube-side path of the superheater is a third heat source circuit; the hull-side path of the steam generator is connected to the steam accumulator and the hull-side path of the superheater; and the hull-side path of the superheater is connected to the medium-pressure steam consumer and the steam accumulator.

[0011] In addition, the working fluid circuit includes: an electric heating device, where this device is connected to the steam accumulator and the medium pressure steam consumer.

[0012] In addition, the steam consumer includes: a low-pressure steam consumer; the working fluid circuit includes: a mixing tank; and the hull-side path of the steam generator, the steam accumulator, the hull-side path of the superheater and the low-pressure steam consumers are also connected to the mixing tank.

[0013] In addition, the steam accumulator is a steam accumulator device or a thermal accumulator device selected according to the regulation of the steam load of the steam consumer and the regulation of the peak levelling load of the nuclear power plant.

[0014] To solve the aforementioned problem, this disclosure further provides a method for supplying nuclear steam to the system according to any of the above implementations that provides clean steam meeting a steam consumer requirement while satisfying the peak levelling load requirement of a nuclear power plant, comprising the following steps: The nuclear power plant generates heating steam and supplies this steam to the heat source circuit according to the peak levelling load requirement; the heat source circuit uses this steam as a source to heat a clean working fluid in the working fluid circuit to form condensed water, which it then supplies to the nuclear power plant's secondary circuit; the working fluid circuit heats the working fluid to form clean steam meeting a steam parameter requirement of the steam consumer; in a case where the clean steam formed by the working fluid circuit is not less than the steam load requirement of the steam consumer, the working fluid circuit supplies the steam consumer with clean steam meeting the steam load requirement of the steam consumer and supplies the steam heat accumulator with excess clean steam relative to the steam load requirement of the steam consumer for storage; and In a case where the clean steam formed by the working fluid circuit is less than the steam load requirement of the steam consumer, the working fluid circuit supplies the steam consumer with the clean steam formed, and the accumulator steam heat forms a clean steam lower than the steam load requirement of the steam consumer and supplies this clean steam to the steam consumer.

[0015] The present disclosure has the following beneficial technical effects.

[0016] According to the nuclear steam supply system and method, the steam heat accumulator stores clean steam exceeding the steam demand of the steam consumer. The steam heat accumulator is combined with the working fluid circuit to produce clean steam below the steam demand of the steam consumer and supplies clean steam to the steam consumer. Thus, both steam load regulation of the steam consumer and peak load regulation of the nuclear power plant are achieved. The system is of low complexity, the operating mode is economical, and the operational safety of the electrical grid and the reactor is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] [Fig-1] is a diagram of a nuclear steam supply system according to the mode implementation 1 of this disclosure;

[0018] [Fig.2] is a diagram of a nuclear steam supply system according to the mode of implementation 2 of this disclosure; and

[0019] [Fig.3] is a diagram of a nuclear steam supply system according to the mode of implementation 3 of this disclosure. DETAILED DESCRIPTION OF THE IMPLEMENTATION METHODS.

[0020] Unless otherwise indicated, all technical and scientific terms used in this specification have the same meanings as those generally understood by persons competent in the field of this disclosure. The terms used in the specification of this disclosure serve only to describe specific embodiments and are not intended to limit this disclosure. The terms "including" and "having," and all their variations, in the specification and claims of this disclosure and in the descriptions of the accompanying figures are intended to cover non-exclusive inclusion. Furthermore, the terms "first," "second," "third," etc., serve only for differentiation and should not be interpreted as an indication or implication of relative importance.

[0021] An embodiment referred to in this description means that a particular feature, structure, or property described in relation to that embodiment may be included in at least one embodiment of this disclosure. The expression appearing in various places in this description does not necessarily refer to the same embodiment and does not constitute a independent or optional achievement exclusive of another. It is explicitly and implicitly understood by the person in the trade that the achievements described in this description may be combined with each other.

[0022] The technical solutions of this disclosure are described below in a clear and complete manner with reference to the figures and specific embodiments.

[0023] Embodiment 1

[0024] With reference to [Fig. 1], a diagram of a nuclear steam supply system according to this example is shown, where the nuclear steam supply system provides clean steam meeting a steam load requirement and a steam parameter requirement from a steam consumer to the steam consumer and meets a peak leveling load requirement of a nuclear power plant, and comprises: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer, and a steam heat accumulator, where the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other;The nuclear power plant is configured to generate heating steam and supply the heating steam to the heat source circuit according to the peak load levelling requirement of the nuclear power plant; the heat source circuit is configured to take the supplied heating steam as a heat source, heat a clean working fluid in the working fluid circuit to generate condensate, and supply the condensate to a secondary circuit of the nuclear power plant; the working fluid circuit is configured to heat the clean working fluid in the working fluid circuit to generate clean steam meeting the steam consumer's steam parameter requirement; In a case where the clean steam formed by the working fluid circuit is not less than the steam demand of the steam consumer, the working fluid circuit supplies the steam consumer with clean steam that meets the steam consumer's steam demand and supplies the steam heat accumulator for storage with clean steam that is in excess of the steam consumer's steam demand; and In a case where the clean steam formed by the working fluid circuit is less than the steam demand of the steam consumer, the working fluid circuit supplies the steam consumer with the clean steam formed, and the steam heat accumulator is combined with the working fluid circuit to form a clean steam lower than the steam demand of the steam consumer and supplies this clean steam to the steam consumer.

[0025] The steam heat accumulator stores excess clean steam relative to the steam demand of the steam consumer, and the steam heat accumulator is combined with the working fluid circuit to form clean steam less than the steam demand of the steam consumer and supplies clean steam to the steam consumer, so that the regulation of the steam load of the steam consumer and the regulation of the peak load of the nuclear power plant are both achieved.

[0026] In this embodiment, the nuclear power plant is a pressurized water reactor nuclear power plant, the steam consumer is a low-pressure steam consumer, the heat source circuit is a first heat source circuit, the pressurized water reactor nuclear power plant is connected to the first heat source circuit, the working fluid circuit is connected to the low-pressure steam consumer and the steam heat accumulator, and the steam heat accumulator is connected to the low-pressure steam consumer; The pressurized water reactor nuclear power plant generates secondary circuit steam after a nuclear reaction occurs, according to the peak levelling load demand of the pressurized water reactor nuclear power plant, and the secondary circuit steam is supplied to the first heat source circuit; the first heat source circuit takes the secondary circuit steam supplied by the pressurized water reactor nuclear power plant as a heat source, heats a clean working fluid in the working fluid circuit to form condensed water, and supplies the condensed water to a secondary circuit of the pressurized water reactor nuclear power plant; the working fluid circuit heats the clean working fluid in the working fluid circuit to form clean, low-pressure steam meeting a parametric steam requirement of the low-pressure steam consumer; In a case where the clean low-pressure steam produced by the working fluid circuit is not less than the steam demand of the low-pressure steam consumer, the working fluid circuit supplies clean low-pressure steam meeting the steam demand of the low-pressure steam consumer to the low-pressure steam consumer, and supplies excess clean low-pressure steam relative to the steam demand of the low-pressure steam consumer to the steam heat accumulator for storage; and in a case where the clean low-pressure steam produced by the working fluid circuit is less than the steam demand of the low-pressure steam consumer pressure, the working fluid circuit supplies clean low-pressure steam formed to the low-pressure steam consumer, and the steam heat accumulator supplies clean low-pressure steam lower than the steam demand of the low-pressure steam consumer to the low-pressure steam consumer.

[0027] The steam heat accumulator stores clean low-pressure steam exceeding the steam demand of the low-pressure steam consumer, and supplies clean low-pressure steam below the steam demand of the low-pressure steam consumer to the low-pressure steam consumer, so that the regulation of the steam load of the low-pressure steam consumer and the regulation of the levelling load of the peaks of the pressurized water reactor nuclear power plant are both achieved.

[0028] In this embodiment, the form of steam in the secondary circuit of the pressurized water reactor nuclear power plant is not limited and may be main steam, high-pressure cylinder exhaust steam or low / intermediate-pressure cylinder exhaust steam of the pressurized water reactor nuclear power plant, or may be other forms of steam from the pressurized water reactor nuclear power plant.

[0029] In this example, the nuclear steam supply system comprises a superheater, a steam generator, a drain tank, a secondary preheater and a primary preheater, where a mutually insulated tube-side circuit and a shell-side circuit are arranged in each of the superheater, steam generator, secondary preheater and primary preheater; the tube-side circuit of the superheater, the tube-side circuit of the steam generator, the drain tank, the tube-side circuit of the secondary preheater and the tube-side circuit of the primary preheater connected in sequence form the first heat source circuit; the tube-side circuit of the superheater and the tube-side circuit of the primary preheater are separately connected to the secondary circuit of the pressurized water reactor nuclear power plant;The superheater hull-side circuit, the steam generator hull-side circuit, the secondary preheater hull-side circuit, and the primary preheater hull-side circuit, connected sequentially, form the working fluid circuit; the superheater hull-side circuit is connected to the low-pressure steam consumer and the steam heat accumulator, and the steam heat accumulator is connected to the low-pressure steam consumer; A heat source in the first heat source circuit passes through the superheater, steam generator, drain tank, secondary preheater, and primary preheater, and is cooled and condensed to form condensate. This condensate is then fed into the secondary circuit of the nuclear reactor power plant. pressurized water; after the clean working fluid in the working fluid circuit has been preheated by the primary preheater, heated by the secondary preheater, evaporated by the steam generator and superheated by the superheater, a clean low-pressure steam meeting a parametric steam requirement of the low-pressure steam consumer is formed; in a case where the clean low-pressure steam formed by the superheater is not less than the steam demand of the low-pressure steam consumer, the superheater supplies clean low-pressure steam meeting the steam demand of the low-pressure steam consumer to the low-pressure steam consumer, and supplies clean low-pressure steam exceeding the steam demand of the low-pressure steam consumer to the steam heat accumulator for storage; in a case where the clean low-pressure steam formed by the superheater is less than the steam demand of the low-pressure steam consumer, the superheater supplies the clean low-pressure steam formed to the low-pressure steam consumer, and the steam heat accumulator supplies clean low-pressure steam less than the steam demand of the low-pressure steam consumer to the low-pressure steam consumer; The steam generator evaporates to form saturated clean steam and supplies the saturated clean steam to the superheater; and the superheater superheats the saturated clean steam supplied by the steam generator through the heat source in the first heat source circuit according to a parametric steam requirement of the low-pressure steam consumer, so that the pressure and / or temperature of the saturated clean steam supplied by the steam generator are increased, and low-pressure clean steam meeting a parametric steam requirement of the low-pressure steam consumer is formed.

[0030] To ensure that the clean low-pressure steam supplied to the low-pressure steam consumer is isolated from the heat source circuit and does not contain radioactive substances, in this embodiment the working fluid circuit further includes: a degasser and a secondary water supply pump, where the degasser is disposed between the primary preheater and the secondary preheater, and the secondary water supply pump is disposed between the degasser and the secondary preheater.After the clean working fluid in the working fluid circuit has been preheated by the primary preheater, degassed by the degasser, pressurized by the secondary water supply pump, heated by the secondary preheater, evaporated by the steam generator and superheated by the superheater, a clean low-pressure steam meeting a parametric requirement of the low-pressure steam consumer is formed, and the degasser ensures that the Clean, low-pressure steam is isolated from the heat source circuit and does not contain radioactive substances.

[0031] In this embodiment, the steam heat accumulator is provided with an inlet end and an outlet end opposite each other, the inlet end of the steam heat accumulator is connected to the hull side circuit of the superheater, and the outlet end of the steam heat accumulator is connected to the low pressure steam consumer.

[0032] In this embodiment, the steam heat accumulator is a steam storage device or a thermal storage device. When the regulated steam load of the low-pressure steam consumer and the regulated peak leveling load of the pressurized water reactor nuclear power plant are low, the steam heat accumulator is a steam storage device; when the regulated steam load of the low-pressure steam consumer and the regulated peak leveling load of the pressurized water reactor nuclear power plant are high, the steam heat accumulator is a thermal storage device; therefore, the steam heat accumulator can regulate the steam load of the low-pressure steam consumer and the peak leveling load of the pressurized water reactor nuclear power plant over a wider range.

[0033] To achieve an uninterrupted supply of nuclear steam, in this embodiment, the clean working fluid in the working fluid circuit is demineralized water; and the working fluid circuit further comprises: a demineralized water tank and a primary water supply pump, where the demineralized water tank is connected to the hull-side circuit of the primary preheater by the primary water supply pump, and is configured to supply pressurized demineralized water by the primary water supply pump to the working fluid circuit.

[0034] In this embodiment, the demineralized water in the demineralized water tank is supplied by a demineralized water system from the pressurized water reactor nuclear power plant or a seawater desalination system.

[0035] In this embodiment, the peak levelling load requirement of the pressurized water reactor nuclear power plant includes a peak levelling operating period of the pressurized water reactor nuclear power plant and a steady-state operating period of the pressurized water reactor nuclear power plant, and the steam load requirement of the low-pressure steam consumer includes a decrease in the steam load of the low-pressure steam consumer and an increase in the steam load of the low-pressure steam consumer. During the peak levelling operating period of the pressurized water reactor nuclear power plant under pressure or the decrease in steam load of the low-pressure steam consumer, the clean low-pressure steam formed by the working fluid circuit exceeds the steam load requirement of the low-pressure steam consumer; and during the steady-state operating period of the pressurized water reactor nuclear power plant or the increase in steam load of the low-pressure steam consumer, the clean low-pressure steam formed by the working fluid circuit is less than the steam load requirement of the low-pressure steam consumer.

[0036] The operating principle of the nuclear steam supply system in this embodiment is as follows: the pressurized water reactor nuclear power plant forms the secondary circuit steam of the pressurized water reactor nuclear power plant after a nuclear reaction occurs according to the peak levelling load requirement of the pressurized water reactor nuclear power plant, and the secondary circuit steam is used as a heat source in the first heat source circuit and provides the heat source to the first heat source circuit; the heat source in the first heat source circuit passes through the superheater, the steam generator, the drain tank, the secondary preheater and the primary preheater, and is cooled and condensed to form condensed water, and the condensed water is supplied to the secondary circuit of the pressurized water reactor nuclear power plant; The demineralized water is pressurized by the primary feed pump and supplied to a working fluid circuit by the demineralized water tank; after the demineralized water in the working fluid circuit is preheated by the primary preheater, degassed by the degasser, pressurized by the secondary feed pump, heated by the secondary preheater, evaporated by the steam generator and superheated by the superheater, clean low-pressure steam meeting the parametric steam requirement of the low-pressure steam consumer is formed; the degasser ensures that the clean low-pressure steam supplied to the low-pressure steam consumer is isolated from the first heat source circuit and does not contain radioactive substances; in a case where the clean low-pressure steam formed by the superheater is not less than the steam load requirement of the low-pressure steam consumer, the superheater supplies clean low-pressure steam meeting the load requirement of the low-pressure steam consumer to the low-pressure steam consumer, and supplies clean low-pressure steam exceeding the load requirement of the low-pressure steam consumer to the steam heat accumulator for storage; In a case where the low-pressure clean steam formed by the superheater is less than the load requirement of the low-pressure steam consumer, the superheater supplies the formed low-pressure clean steam to the low-pressure steam consumer, and the steam heat accumulator supplies low-pressure clean steam less than the parametric requirement of the low-pressure steam consumer to the low-pressure steam consumer; and the superheater superheats the saturated clean steam supplied by the steam generator through the tube-side circuit according to the parametric requirement of the low-pressure steam consumer, so that the pressure and / or temperature are increased and the low-pressure clean steam meeting the parametric requirement of the consumer is formed.

[0037] Embodiment 2

[0038] With reference to [Fig.2], a diagram of a nuclear steam supply system according to this exemplary embodiment is shown, where the nuclear steam supply system provides clean steam meeting a steam load requirement and a steam parameter requirement from a steam consumer to the steam consumer and meets a peak levelling load requirement of a nuclear power plant, and comprises: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer and a steam heat accumulator, where the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other; The nuclear power plant is configured to generate heating steam and supply the heating steam to the heat source circuit according to the peak load levelling requirement of the nuclear power plant; the heat source circuit is configured to take the supplied heating steam as a heat source, heat a clean working fluid in the working fluid circuit to generate condensate and supply the condensate to a secondary circuit of the nuclear power plant; the working fluid circuit is configured to heat the clean working fluid in the working fluid circuit to generate clean steam meeting the steam consumer's steam parameter requirement; In a case where the clean steam formed by the working fluid circuit is not less than the steam load requirement of the steam consumer, the working fluid circuit supplies clean steam meeting the steam load requirement of the steam consumer to the steam consumer, and provides clean steam exceeding the steam load requirement from the steam consumer to the steam heat accumulator for storage; and In a case where the clean steam formed by the working fluid circuit is less than the steam load requirement of the steam consumer, the working fluid circuit supplies the clean steam formed to the steam consumer, and the steam heat accumulator is combined with the working fluid circuit to form clean steam less than the load requirement of the consumer and supplies the clean steam to the consumer.

[0039] The heat accumulator stores clean steam exceeding the consumer's load requirement, and the accumulator is combined with the circuit to form clean steam below the consumer's requirement and supplies clean steam to the consumer, so that both the consumer's thermal regulation and the system's thermal regulation are achieved.

[0040] In this embodiment, the heat source circuit comprises a second heat source circuit and a third heat source circuit, the nuclear power plant comprises a pressurized water reactor nuclear power plant and a high-temperature reactor nuclear power plant, the steam consumer comprises an intermediate-pressure steam consumer, the pressurized water reactor nuclear power plant is connected to the second heat source circuit, the high-temperature reactor nuclear power plant is connected to the third heat source circuit, the working fluid circuit is connected to the intermediate-pressure steam consumer and to the steam heat accumulator, the steam heat accumulator is connected to the intermediate-pressure steam consumer,and the second heat source circuit and the third heat source circuit are separately independent of the working fluid circuit; The pressurized water reactor nuclear power plant forms secondary circuit steam after a nuclear reaction occurs according to the peak levelling load demand of the pressurized water reactor nuclear power plant, and the secondary circuit steam is supplied to the second heat source circuit; the high-temperature reactor nuclear power plant forms secondary circuit steam after a nuclear reaction occurs according to the peak levelling load demand of the high-temperature reactor nuclear power plant, and the secondary circuit steam is supplied to the third heat source circuit; The second heat source circuit uses secondary circuit steam supplied by the pressurized water reactor nuclear power plant as its heat source, and after the clean working fluid in the working fluid circuit is heated, condensate is formed and supplied to a secondary circuit of the power plant nuclear pressurized water reactor; the third heat source circuit takes secondary circuit steam supplied by the high-temperature nuclear reactor as a heat source, and after the clean working fluid in the working fluid circuit is heated, condensed water is formed and supplied to a secondary circuit of the high-temperature nuclear reactor; the working fluid circuit heats the clean working fluid in the working fluid circuit to form clean intermediate-pressure steam meeting a steam parameter requirement of an intermediate-pressure steam consumer; in a case where the clean intermediate pressure steam formed by the working fluid circuit is not less than the steam demand of the intermediate pressure steam consumer, the working fluid circuit supplies clean intermediate pressure steam meeting the requirements of the intermediate pressure steam consumer to the intermediate pressure steam consumer, and supplies clean steam exceeding the requirement of the intermediate pressure steam consumer to the steam heat accumulator for storage;and in a case where the clean intermediate pressure steam formed by the working fluid circuit is less than the requirements of the intermediate pressure steam consumer, the working fluid circuit supplies the clean intermediate pressure steam formed to the intermediate pressure steam consumer, and the steam heat accumulator cooperates with the working fluid circuit to form clean intermediate pressure steam less than a requirement of the intermediate pressure steam consumer and supplies the clean steam to the intermediate pressure steam consumer.

[0041] The steam heat accumulator stores excess clean steam exceeding the steam demand of the intermediate pressure steam consumer, and the steam heat accumulator cooperates with the working fluid circuit to form clean steam at intermediate pressure lower than the steam demand of the intermediate pressure steam consumer and supplies the clean intermediate pressure steam to the intermediate pressure steam consumer, so that the steam load of the intermediate pressure steam consumer, the peak leveling load of the pressurized water reactor nuclear power plant and the peak leveling load of the high temperature reactor nuclear power plant are regulated.

[0042] In this embodiment, the form of the steam in the secondary circuit of the pressurized water reactor nuclear power plant is not limited, and may be main steam, exhaust steam from the high-pressure cylinder or exhaust steam from the low / intermediate-pressure cylinder of the pressurized water reactor nuclear power plant, or may be other forms of steam from the power plant nuclear pressurized water reactor; the form of steam from the secondary circuit of the nuclear high-temperature reactor is not limited, and may be main steam, high-pressure cylinder exhaust steam or low / intermediate cylinder exhaust steam from the nuclear high-temperature reactor, or may be other forms of steam from the nuclear high-temperature reactor.

[0043] In this embodiment, the nuclear steam supply system comprises a superheater, a steam generator, a drain tank, a secondary preheater and a primary preheater, where a mutually isolated tube-side circuit and a shell-side circuit are arranged in each of the superheater, steam generator, secondary preheater and primary preheater; the tube-side circuit of the superheater is a third heat source circuit, and the tube-side circuit of the superheater is connected to a secondary circuit of the high-temperature reactor nuclear power plant; the steam generator tube-side circuit, the drain tank, the secondary preheater tube-side circuit and the primary preheater tube-side circuit connected in sequence form a second heat source circuit; the steam generator tube-side circuit and the primary preheater tube-side circuit are separately connected to a secondary circuit of the pressurized water reactor nuclear power plant; the superheater hull-side circuit, the steam generator hull-side circuit, the secondary preheater hull-side circuit and the primary preheater hull-side circuit connected in sequence form the working fluid circuit; the superheater hull-side circuit is connected to the intermediate pressure steam consumer; a heat source in the second heat source circuit passes through the steam generator, the drain tank, the secondary preheater and the primary preheater, and is cooled and condensed to form condensed water, and the condensed water is supplied to the secondary circuit of the pressurized water reactor nuclear power plant; a heat source in the third heat source circuit passes through the superheater, then is cooled and condensed to form condensed water, and the condensed water is supplied to the secondary circuit of the high temperature reactor nuclear power plant; the clean working fluid in the working fluid circuit forms, after preheating by the primary preheater, heating by the secondary preheater and evaporation by the steam generator, a clean saturated steam; in the case where the saturated clean steam formed by the steam generator is not less than the steam demand of the pressure steam consumer intermediate, the steam generator supplies the superheater with clean saturated steam that meets the steam demand of the intermediate pressure steam consumer, and supplies the steam heat accumulator for storage with excess clean saturated steam that exceeds the steam demand of the intermediate pressure steam consumer; in the event that the clean saturated steam formed by the steam generator is less than the steam demand of the intermediate-pressure steam consumer, the steam generator supplies the superheater with the clean saturated steam formed, and the steam heat accumulator supplies the superheater with the clean saturated steam that is less than the steam demand of the intermediate-pressure steam consumer; and The superheater superheats, according to the parametric steam requirement of the intermediate pressure steam consumer, the saturated clean steam supplied by the steam generator via a thermal source in the third thermal circuit, so that the pressure and / or temperature of the saturated clean steam supplied by the steam generator is increased, and that an intermediate pressure clean steam is formed meeting the parametric steam requirements of the consumer in question.

[0044] In this embodiment, the working fluid circuit further comprises: an electric heater, each heat accumulator steam and electric heater being provided opposite inlet end outlet end other inlet end heat accumulator steam being connected path on hull side steam generator outlet end heat accumulator steam being connected inlet end electric heater path on hull side superheater inlet end mixing tank outlet end electric heater being connected intermediate pressure steam consumer; in case where clean saturated vapors formed by steam generator are less than steam demand consumer steam intermediate pressure steam generator supplies clean saturated vapors formed superheater heat accumulator steam supplies clean saturated vapors less than steam demand consumer steam intermediate pressure electric heating; electric heating superheats according to parametric requirement consumer steam intermediate pressure clean saturated vapors supplied heat accumulator steams so that pressure and / or temperature are increased clean saturated vapors supplied heat accumulator steams are formed clean vapors intermediate pressure meeting parametric requirement consumer steam intermediate pressure steams.

[0045] To ensure that the clean intermediate-pressure steam supplied to the intermediate-pressure steam consumer is isolated from the heat source circuit and does not contain radioactive substances, in this embodiment, the circuit The working fluid system further comprises a deaerator and a secondary water supply pump, where the deaerator is located between the primary and secondary preheaters, and the secondary water supply pump is located between the deaerator and the secondary preheater. After the clean working fluid in the working fluid circuit has been preheated by the primary preheater, deaerated by the deaerator, pressurized by the secondary water supply pump, heated by the secondary preheater, evaporated by the steam generator, and superheated by the superheater, clean intermediate-pressure steam meeting the steam load requirements of the intermediate-pressure steam consumer is formed. The deaerator ensures that the clean intermediate-pressure steam is isolated from the heat source circuit and does not contain radioactive substances.

[0046] In this embodiment, according to one implementation, the steam heat accumulator is a steam storage device or a heat storage device; in the case where the regulated steam load of the intermediate pressure steam consumer, the regulated peak leveling load of the pressurized water reactor nuclear power plant and the regulated peak leveling load of the high temperature reactor nuclear power plant are low, the steam heat accumulator is a steam storage device; in the case where the regulated steam load of the intermediate pressure steam consumer, the regulated peak leveling load of the pressurized water reactor nuclear power plant and the regulated peak leveling load of the high temperature reactor nuclear power plant are high, the steam heat accumulator is a heat storage device;Therefore, the steam heat accumulator can regulate the steam load of intermediate pressure steam consumers, the peak load of the pressurized water reactor nuclear power plant, and the peak load of the high-temperature reactor nuclear power plant over a wider range.

[0047] To ensure an uninterrupted supply of nuclear steam, in this embodiment, the clean working fluid in the working fluid circuit is demineralized water; and the nuclear steam supply system further comprises: a demineralized water tank and a primary water supply pump, where the demineralized water tank is connected to the hull-side circuit of the primary preheater by the primary water supply pump, and is configured to supply demineralized water to the working fluid circuit.

[0048] In this embodiment, the demineralized water in the demineralized water tank is supplied by a demineralized water system from the nuclear power plant or a seawater desalination system.

[0049] The operating principle of the nuclear steam supply system in this embodiment is as follows: the nuclear power plant with a pressurized water reactor steam from the secondary circuit of the pressurized water reactor nuclear power plant after a nuclear reaction occurs according to the peak levelling load requirement of the pressurized water reactor nuclear power plant, and the steam from the secondary circuit is used as a heat source in a secondary heat source circuit and supplied to the secondary heat source circuit; high-temperature reactor nuclear power plant steam from the secondary circuit of the high-temperature reactor nuclear power plant after a nuclear reaction occurs according to the peak levelling load requirement of the high-temperature reactor nuclear power plant, and the steam from the secondary circuit is used as a heat source in a third heat source circuit and supplied to the third heat source circuit; the heat source in the second heat source circuit passes through the steam generator, drain tank, secondary preheater and primary preheater, and is cooled and condensed to form condensed water, and the condensed water is supplied to the secondary circuit of the pressurized water reactor nuclear power plant; the heat source in the third heat source circuit passes through the superheater, then is cooled and condensed to form condensed water, and the condensed water is supplied to the secondary circuit of the high temperature reactor nuclear power plant; The demineralized water is pressurized by the primary water supply pump and is supplied to the working fluid circuit by the demineralized water tank, after the demineralized water in the working fluid circuit is preheated by the primary preheater, deaerated by the degasser, pressurized by the secondary water supply pump, heated by the secondary preheater, and evaporated by the steam generator to form clean saturated steam.

[0050] The degasser ensures that the clean intermediate pressure steam supplied to the intermediate pressure steam consumer is isolated from the heat source circuit and does not contain radioactive substances; in the case where the clean saturated steam formed by the steam generator is not less than the steam load demand of the intermediate pressure steam consumer, the steam generator supplies the clean saturated steam meeting the steam load demand of the intermediate pressure steam consumer to the superheater, and supplies the clean saturated steam exceeding the steam load demand of the intermediate pressure steam consumer to the steam heat accumulator for storage; In the event that the saturated clean steam produced by the steam generator is less than the steam load demand of the intermediate pressure steam consumer, the steam generator supplies the saturated clean steam produced to superheater, and the steam heat accumulator supplies clean saturated steam below the steam load demand of the intermediate pressure steam consumer to the superheater or electric heater; The superheater superheats the clean saturated steam supplied by the steam generator via the heat source in the third heat source circuit according to the parametric steam requirement of the intermediate pressure steam consumer, so that the pressure and / or temperature of the clean saturated steam supplied by the steam generator are increased, and clean intermediate pressure steam meeting the parametric steam requirement of the intermediate pressure steam consumer is formed; and The electric heater superheats the clean saturated steam supplied by the steam heat accumulator according to the parametric steam requirement of the intermediate pressure steam consumer, so that the pressure and / or temperature of the clean saturated steam supplied by the steam heat accumulator are increased, and the clean intermediate pressure steam meeting the parametric steam requirement of the intermediate pressure steam consumer is formed.

[0051] In this embodiment, the peak levelling load requirement of the pressurized water reactor nuclear power plant includes a peak levelling operation period of the pressurized water reactor nuclear power plant and a steady-state operation period of the pressurized water reactor nuclear power plant, the peak levelling load requirement of the high-temperature reactor nuclear power plant includes a peak levelling operation period of the high-temperature reactor nuclear power plant and a steady-state operation period of the high-temperature reactor nuclear power plant, and the intermediate pressure steam consumer steam load requirement includes a decrease in the intermediate pressure steam consumer steam load and an increase in the intermediate pressure steam consumer steam load.During the peak leveling operation period of the pressurized water reactor nuclear power plant, the peak leveling operation period of the high-temperature reactor nuclear power plant, or the reduction in steam load of the intermediate-pressure steam consumer, the clean intermediate-pressure steam formed by the working fluid circuit exceeds the steam load requirement of the intermediate-pressure steam consumer; and during the steady-state operation period of the pressurized water reactor nuclear power plant, the steady-state operation period of the high-temperature reactor nuclear power plant, or the increase in steam load of the intermediate-pressure steam consumer, the clean pressure steam. intermediate formed by the working fluid circuit is less than the steam load requirement of the intermediate pressure steam consumer.

[0052] Embodiment 3

[0053] With reference to [Fig.3], a diagram of the structure of a nuclear steam supply system according to this embodiment is shown, where the nuclear steam supply system provides clean steam meeting a steam load requirement and a steam parameter requirement from a steam consumer to the steam consumer and meets a peak levelling load requirement of a nuclear power plant, and comprises: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer and a steam heat accumulator, where the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other; The nuclear power plant is configured to generate heating steam and supply the heating steam to the heat source circuit according to the peak levelling load requirement of the nuclear power plant; the heat source circuit is configured to take the supplied heating steam as a heat source, heat a clean working fluid in the working fluid circuit to generate condensate, and supply the condensate to a secondary circuit of the nuclear power plant; the working fluid circuit is configured to heat the clean working fluid in the working fluid circuit to generate clean steam meeting the steam consumer's steam parameter requirement; in a case where the clean steam formed by the working fluid circuit is not less than the steam load requirement of the steam consumer, the working fluid circuit supplies clean steam meeting the steam load requirement of the steam consumer to the steam consumer, and supplies clean steam exceeding the steam load requirement of the steam consumer to the steam heat accumulator for storage; and In a case where the clean steam formed by the working fluid circuit is less than the steam load requirement of the steam consumer, the working fluid circuit supplies the clean steam formed to the steam consumer, and the steam heat accumulator cooperates with the working fluid circuit to form clean steam less than the steam load requirement of the steam consumer and supplies the clean steam to the steam consumer.

[0054] The steam heat accumulator stores clean steam exceeding the load requirement of the steam consumer, and the accumulator cooperates with the circuit to to produce a clean steam below the requirement and supply it to the steam consumer, thus allowing the regulation of the steam consumer loads and the regulation of maximum loads.

[0055] In this embodiment, the heat source circuit comprises a second heat source circuit and a third heat source circuit; the nuclear power plant comprises a pressurized water reactor nuclear power plant and a high-temperature reactor nuclear power plant; the steam consumer comprises an intermediate-pressure steam consumer and a low-pressure steam consumer; the pressurized water reactor nuclear power plant is connected to the second heat source circuit; the high-temperature reactor nuclear power plant is connected to the third heat source circuit; the working fluid circuit is connected to the low-pressure steam consumer, the intermediate-pressure steam consumer, and the steam heat accumulator; the steam heat accumulator is connected to the low-pressure steam consumer and the intermediate-pressure steam consumer.and the second heat source circuit and the third heat source circuit are separately independent of the working fluid circuit; The pressurized water reactor nuclear power plant forms secondary circuit steam after a nuclear reaction occurs according to the peak levelling load demand of the pressurized water reactor nuclear power plant, and the secondary circuit steam is supplied to the second heat source circuit; the high-temperature reactor nuclear power plant forms secondary circuit steam after a nuclear reaction occurs according to the peak levelling load demand of the high-temperature reactor nuclear power plant, and the secondary circuit steam is supplied to the third heat source circuit; the second heat source circuit takes steam from the secondary circuit supplied by the pressurized water reactor nuclear power plant as a heat source, and after the clean working fluid in the working fluid circuit is heated, condensed water is formed and supplied to a secondary circuit of the pressurized water reactor nuclear power plant; the third heat source circuit takes steam from the secondary circuit supplied by the high-temperature reactor nuclear power plant as a heat source, and after the clean working fluid in the working fluid circuit is heated, condensed water is formed and supplied to a secondary circuit of the high-temperature reactor nuclear power plant;The working fluid circuit heats the clean working fluid in the working fluid circuit to form clean, intermediate-pressure steam that meets the steam parameter demand of the low-pressure steam consumer and the steam parameter demand of the intermediate-pressure steam consumer; in a case where the clean low-pressure steam formed by the working fluid circuit is not less than the steam load demand of the low-pressure steam consumer, the working fluid circuit supplies clean low-pressure steam meeting the steam load demand of the low-pressure steam consumer to the low-pressure steam consumer, and supplies clean steam exceeding the steam load demand of the low-pressure steam consumer to the steam heat accumulator for storage;in a case where the clean intermediate pressure steam formed by the working fluid circuit is not less than the steam load demand of the intermediate pressure steam consumer, the working fluid circuit supplies clean intermediate pressure steam meeting the steam load demand of the intermediate pressure steam consumer to the intermediate pressure steam consumer, and supplies clean steam exceeding the steam load demand of the intermediate pressure steam consumer to the steam heat accumulator for storage; in a case where the clean low-pressure steam formed by the working fluid circuit is less than the steam load demand of the low-pressure steam consumer, the working fluid circuit supplies the clean low-pressure steam formed to the low-pressure steam consumer, and the steam heat accumulator cooperates with the working fluid circuit to form the clean low-pressure steam less than the steam load demand of the low-pressure steam consumer and supplies the clean low-pressure steam to the low-pressure steam consumer;and in a case where the clean intermediate pressure steam formed by the working fluid circuit is less than the steam load demand of the intermediate pressure steam consumer, the working fluid circuit supplies the clean intermediate pressure steam formed to the intermediate pressure steam consumer, and the steam heat accumulator cooperates with the working fluid circuit to form clean intermediate pressure steam less than the steam load demand of the intermediate pressure steam consumer and supplies the clean steam to the intermediate pressure steam consumer.

[0056] The steam heat accumulator stores clean steam exceeding the steam requirement of the low-pressure steam consumer and clean steam meeting the steam requirement of the medium-pressure steam consumer, cooperates with the working fluid circuit to form clean low-pressure steam below the steam requirement of the low-pressure steam consumer, supplies the clean low-pressure steam to the low-pressure steam consumer, cooperates with the working fluid circuit to form clean medium-pressure steam below the steam requirement of the medium-pressure steam consumer, and supplies the clean medium-pressure steam to the steam consumer at medium pressure, so that the steam load of the low-pressure steam consumer, the steam load of the medium-pressure steam consumer, the peak levelling load of the pressurized water reactor nuclear power plant and the peak levelling load of the high-temperature reactor nuclear power plant are regulated.

[0057] In this example, the form of the steam in the secondary circuit of the pressurized water reactor nuclear power plant is not limited and can be main steam, high-pressure cylinder exhaust steam or low / medium-pressure cylinder exhaust steam of the pressurized water reactor nuclear power plant, or can be other forms of steam from the pressurized water reactor nuclear power plant; the form of the steam in the secondary circuit of the high-temperature reactor nuclear power plant is not limited and can be main steam, high-pressure cylinder exhaust steam or low / medium-pressure cylinder exhaust steam of the high-temperature reactor nuclear power plant, or can be other forms of steam from the high-temperature reactor nuclear power plant.

[0058] In this example, the nuclear steam supply system comprises a superheater, a steam generator, a drain tank, a secondary preheater, a primary preheater and a mixing tank, where a mutually insulated tube-side path and a shell-side path are disposed in each of the superheater, steam generator, secondary preheater and primary preheater; the tube-side path of the superheater is a third heat source circuit and the tube-side path of the superheater is connected to a secondary circuit of the high-temperature reactor nuclear power plant; the steam generator tube-side path, the drain tank, the secondary preheater tube-side path and the primary preheater tube-side path connected in sequence form a second heat source circuit; the steam generator tube-side path and the primary preheater tube-side path are separately connected to a secondary circuit of the pressurized water reactor nuclear power plant; the superheater shell side path, the steam generator shell side path, the secondary preheater shell side path and the primary preheater shell side path connected in sequence, and the superheater shell side path and the steam generator calandra side path being separately connected to the mixing tank, to form the working fluid circuit; the superheater shell side path is connected to the intermediate pressure steam consumer, and the mixing tank is connected to the low pressure steam consumer; a heat source in the second heat source circuit passes through the steam generator, the drain tank, the secondary preheater and the primary preheater, and is cooled and condensed to form condensed water, and the condensed water is fed into the secondary circuit of the pressurized water reactor nuclear power plant; a heat source in the third heat source circuit passes through the superheater, then is cooled and condensed to form condensed water, and the condensed water is fed into the secondary circuit of the high temperature reactor nuclear power plant; the clean working fluid in the working fluid circuit forms saturated clean steam after being preheated by the primary preheater, heated by the secondary preheater and evaporated by the steam generator; in a case where the saturated clean steam formed by the steam generator is not less than the sum of the steam requirements of the intermediate pressure steam consumer and the steam requirements of the low pressure steam consumer, the steam generator supplies part of the saturated clean steam to the superheater, part of the saturated clean steam to the mixing tank, and the remaining saturated clean steam to the steam heat accumulator for storage; in a case where the clean saturated steam formed by the steam generator is less than the sum of the steam requirements of the intermediate pressure steam consumer and the steam requirements of the low pressure steam consumer, the steam generator supplies the clean saturated steam formed to the mixing tank and / or the superheater, and the steam heat accumulator supplies the clean saturated steam less than the sum of the steam requirements of the intermediate pressure steam consumer and the steam requirements of the low pressure steam consumer to the mixing tank and / or the superheater; The superheater superheats the clean saturated steam supplied by the steam generator and / or steam heat accumulator via the heat source in the third heat source circuit according to the steam parameters required by the intermediate pressure steam consumer, in order to increase the pressure and / or temperature of the clean saturated steam supplied by the steam generator, and forms clean intermediate pressure steam meeting the parameters required by the intermediate pressure steam consumer;depending on the clean intermediate pressure steam formed by the superheater, the clean intermediate pressure steam meeting the steam requirements of the intermediate pressure steam consumer is supplied to the intermediate pressure steam consumer, and the clean intermediate pressure steam in excess of the steam requirements of the intermediate pressure steam consumer is supplied to the mixing tank; The mixing tank mixes the saturated clean steam supplied by the steam generator and / or the steam heat accumulator and the intermediate pressure clean steam supplied by the superheater according to the parameters required by the low pressure steam consumer, in order to form a low pressure clean steam meeting the parameters required by the low pressure steam consumer; and according to the low pressure clean steam formed by the mixing tank, the low pressure clean steam meeting the steam requirements of the low pressure steam consumer is supplied to the low pressure steam consumer, and the excess low pressure clean steam compared to the steam requirements of the low pressure steam consumer is supplied to the steam heat accumulator for storage.

[0059] In this embodiment, the working fluid circuit further comprises: an electric heater, each of the steam heat accumulator, the mixing tank and the electric heater being provided with an inlet end and an outlet end opposite to each other, the inlet end of the steam heat accumulator being connected to the hull-side path of the steam generator and to the outlet end of the mixing tank, and the outlet end of the steam heat accumulator being connected to the inlet end of the electric heater, to the hull-side path of the superheater and to the inlet end of the mixing tank;the inlet end of the mixing tank being connected to the hull-side path of the steam generator and to the hull-side path of the superheater, the outlet end of the mixing tank being connected to the low-pressure steam consumer, and the outlet end of the electric heater being connected to the medium-pressure steam consumer and the superheater; in the case where the clean saturated steam formed by the steam generator is less than the sum of the steam load of the medium-pressure steam consumer and the steam load of the low-pressure steam consumer, the steam heat accumulator supplies the clean saturated steam less than the sum of the steam load of the medium-pressure steam consumer and the steam load of the low-pressure steam consumer to the electric heater;electric heating superheats the saturated clean steam supplied by the steam heat accumulator according to the steam specification of the medium-pressure steam consumer, so that the pressure and / or temperature of the saturated clean steam supplied by the steam heat accumulator are increased, and medium-pressure clean steam meeting the steam specification of the medium-pressure steam consumer is formed; and according to the medium-pressure clean steam formed by the electric heating and the medium-pressure clean steam formed by the superheater, the medium-pressure clean steam meeting the load of; Steam from a medium-pressure steam consumer is supplied to the medium-pressure steam consumer, and excess medium-pressure clean steam relative to the steam load of the medium-pressure steam consumer is supplied to the mixing vessel. To ensure that the low-pressure clean steam supplied to the low-pressure steam consumer and the medium-pressure clean steam from the medium-pressure steam consumer are isolated from the heat source circuit and do not contain radioactive substances, in this embodiment, the working fluid circuit further comprises: a deaerator and a secondary water supply pump, wherein the deaerator is disposed between the primary preheater and the secondary preheater, and the secondary water supply pump is disposed between the deaerator and the secondary preheater;The clean working fluid in the working fluid circuit is preheated by the primary preheater, degassed by the degasser, pressurized by the secondary water supply pump, heated by the secondary preheater and evaporated by the steam generator and superheated to form saturated clean steam, and the degasser ensures that the low-pressure clean steam and the medium-pressure clean steam are isolated from the heat source circuit and do not contain radioactive substances.

[0060] In this embodiment, the steam heat accumulator is a steam storage device or a heat storage device; in the case where the regulated steam load of the low-pressure steam consumer, the regulated steam load of the medium-pressure steam consumer, the peak leveling load of the pressurized water reactor nuclear power plant and the peak leveling load of the high-temperature reactor nuclear power plant are low, the steam heat accumulator is a steam storage device;In the case where the regulated steam load of the low-pressure steam consumer, the regulated steam load of the medium-pressure steam consumer, the peak leveling load of the pressurized water reactor nuclear power plant, and the peak leveling load of the high-temperature reactor nuclear power plant are high, the steam heat accumulator is a heat storage device; therefore, the steam heat accumulator can regulate the steam load of the low-pressure steam consumer, the steam load of the medium-pressure steam consumers, the peak leveling load of the pressurized water reactor nuclear power plant, and the peak load of the high-temperature reactor nuclear power plant over a wider range.

[0061] To ensure an uninterrupted supply of nuclear steam, in this embodiment, the clean working fluid in the working fluid circuit is demineralized water; and the working fluid circuit further comprises: a demineralized water tank and a primary water supply pump, where the water tank demineralized is connected to the hull side path of the primary preheater by the primary water supply pump, and is configured to supply demineralized water to the working fluid circuit.

[0062] In this embodiment, the demineralized water in the demineralized water tank is supplied by a demineralized water system from the nuclear power plant or a seawater desalination system.

[0063] The operating principle of the nuclear steam supply system in this embodiment is as follows: the pressurized water reactor nuclear power plant forms secondary circuit steam from the pressurized water reactor nuclear power plant after a nuclear reaction occurs according to the peak levelling load requirement of the pressurized water reactor nuclear power plant, and the secondary circuit steam is used as a heat source in a secondary heat source circuit and supplied to the secondary heat source circuit;The high-temperature reactor nuclear power plant forms secondary circuit steam after a nuclear reaction occurs according to the peak levelling load requirement of the high-temperature reactor nuclear power plant, and the secondary circuit steam is used as a heat source in a third heat source circuit and fed into the third heat source circuit; the heat source in the second heat source circuit passes through the steam generator, the drain tank, the secondary preheater and the primary preheater, and is cooled and condensed to form condensed water, and the condensed water is fed into the secondary circuit of the pressurized water reactor nuclear power plant; the heat source in the third heat source circuit passes through the superheater, then is cooled and condensed to form condensed water, and the condensed water is fed into the secondary circuit of the high temperature reactor nuclear power plant; The demineralized water is pressurized by the primary water supply pump and is supplied into the working fluid circuit by the demineralized water tank, after the demineralized water in the working fluid circuit is preheated by the primary preheater, degassed by the degasser, pressurized by the secondary water supply pump, heated by the secondary preheater, and evaporated by the steam generator to form saturated clean steam; the degasser ensures that the low-pressure clean steam supplied to the low-pressure steam consumer and the medium-pressure clean steam supplied to the medium-pressure steam consumer are isolated from the heat source circuit and do not contain radioactive substances; in a case where the saturated clean steam formed by the steam generator is not less than the sum of the steam load requirements of the medium pressure steam consumer and the steam load requirements of the low pressure steam consumer, the steam generator supplies part of the saturated clean steam to the superheater, part of the saturated clean steam to the mixing tank, and the remaining saturated clean steam to the steam heat accumulator for storage; in a case where the clean saturated steam formed by the steam generator is less than the sum of the steam load requirements of the medium pressure steam consumer and the steam load requirements of the low pressure steam consumer, the steam generator supplies the clean saturated steam formed to the mixing tank and / or the superheater, and the steam heat accumulator supplies the clean saturated steam less than the sum of the steam load requirements of the medium pressure steam consumer and the steam load requirements of the low pressure steam consumer to the mixing tank and / or the superheater and / or the electric heater; the superheater superheats the clean saturated steam supplied by the steam generator and / or steam heat accumulator via the heat source in the third heat source circuit according to the steam parameter requirement of the medium pressure steam consumer, so that the pressure and / or temperature of the clean saturated steam supplied by the steam generator are increased, and a clean medium pressure steam meeting the steam parameter requirements of the medium pressure steam consumer is formed;depending on the medium-pressure clean steam produced by the superheater, the medium-pressure clean steam meeting the steam load requirements of the medium-pressure steam consumer is fed to the medium-pressure steam consumer, and the medium-pressure clean steam exceeding the steam load requirements of the medium-pressure steam consumer is fed to the mixing tank; Electric heating superheats the saturated clean steam supplied by the steam heat accumulator according to the steam parameter requirements of the medium-pressure steam consumer, so that the pressure and / or temperature of the saturated clean steam supplied by the steam heat accumulator are increased, and medium-pressure clean steam meeting the steam parameter requirements of the medium-pressure steam consumer is formed; depending on the medium-pressure clean steam formed by the electric heating and the medium-pressure clean steam formed by the superheater, the medium-pressure clean steam meeting the steam load requirements of a consumer of medium pressure steam is supplied to the medium pressure steam consumer, and clean medium pressure steam exceeding the steam load requirements of the medium pressure steam consumer is supplied to the mixing tank; The mixing tank mixes clean steam supplied by the steam generator and / or steam heat accumulator and medium-pressure clean steam supplied by the superheater or electric heater according to the steam parameter requirement of the low-pressure steam consumer, and low-pressure clean steam meeting the steam parameter requirements of the low-pressure steam consumer is formed; and according to the low-pressure clean steam formed by the mixing tank, low-pressure clean steam meeting the steam load requirements of the low-pressure steam consumer is supplied to the low-pressure steam consumer, and low-pressure clean steam exceeding the steam load requirements of the low-pressure steam consumer is supplied to the steam heat accumulator for storage.

[0064] In this embodiment, the peak levelling load requirement of the pressurized water reactor nuclear power plant includes a peak levelling operating period of the pressurized water reactor nuclear power plant and a steady-state operating period of the pressurized water reactor nuclear power plant; the peak levelling load requirement of the high-temperature reactor nuclear power plant includes a peak levelling operating period of the high-temperature reactor nuclear power plant and a steady-state operating period of the high-temperature reactor nuclear power plant; the steam load requirement of the intermediate-pressure steam consumers includes a decrease in the steam load of the intermediate-pressure steam consumer and an increase in the steam load of the intermediate-pressure steam consumer.and the steam load requirement of the low-pressure steam consumer includes a decrease in the steam load of the low-pressure steam consumer and an increase in the steam load of the low-pressure steam consumer.

[0065] During the peak leveling operating period of the pressurized water reactor nuclear power plant, the peak leveling operating period of the high-temperature reactor nuclear power plant, the reduction of the steam load of the low-pressure steam consumer, or the reduction of the steam load of the intermediate-pressure steam consumer, the clean steam formed by the working fluid circuit exceeds the steam load requirement of the steam consumer; and during the steady-state operating period permanent of the pressurized water reactor nuclear power plant, the period of steady-state operation of the high-temperature reactor nuclear power plant, the decrease in the steam load of the low-pressure steam consumer or the increase in the steam load of the intermediate-pressure steam consumer, the clean steam formed by the working fluid circuit is less than the steam load requirement of the consumer.

[0066] Embodiment 4.

[0067] This embodiment provides a method for supplying nuclear steam, applicable to the nuclear steam supply system according to any one of the embodiments, which supplies clean steam meeting a steam load requirement and a steam parameter requirement from a steam consumer to the steam consumer and meets a peak levelling load requirement of a nuclear power plant, and comprising the following steps: The nuclear power plant generates heating steam and supplies the heating steam to the heat source circuit according to the peak levelling load requirement of the nuclear power plant; the heat source circuit takes the supplied heating steam as a heat source, heats a clean working fluid in the working fluid circuit to form condensate and supplies the condensate to a secondary circuit of the nuclear power plant; the working fluid circuit heats the clean working fluid in the working fluid circuit to form clean steam meeting the steam parameter requirement of the steam consumer; in a case where the clean steam formed by the working fluid circuit is not less than the steam load requirement of the steam consumer, the working fluid circuit supplies the steam consumer with clean steam meeting the steam load requirement of the steam consumer, and supplies the steam-to-steam heat accumulator with clean steam exceeding the steam load requirement of the steam consumer for storage; and In a case where the clean steam formed by the working fluid circuit is less than the steam load requirement of the steam consumer, the working fluid circuit supplies the steam consumer with the clean steam formed, and the steam-to-steam heat accumulator forms clean steam less than the steam load requirement of the steam consumer and supplies the clean steam to the steam consumer.

[0068] It should be noted that, depending on the differences in the structures of the nuclear steam supply systems and the steam consumers, the nuclear steam supply system can be a nuclear steam supply system based on a pressurized water reactor nuclear power plant and a nuclear steam supply system based on a nuclear water reactor nuclear power plant In a high-temperature nuclear reactor, pressure and steam consumers can be classified as intermediate-pressure or low-pressure steam consumers. Depending on different steam parameter requirements and actual application scenarios, and according to certain implementation variations, the structure of the nuclear steam supply system can be further adapted.

[0069] The addition of electric heating is considered based on the volume and economic efficiency of superheated steam production. When the quantity produced is large, a heat source in a secondary heat source circuit is used primarily for superheating. When the quantity to be produced is small, for example, within the range of thermal load fluctuations, electric heating is used primarily for superheating. Depending on the consumer's thermal parameter requirements, while simultaneously considering system complexity and high operating cost efficiency, electric heating is selected as the best option for meeting thermal parameter requirements under various conditions.

[0070] The above embodiments illustrate only certain implementations of this disclosure, and their description is relatively specific and detailed, but should not be interpreted as a limitation of the scope of the patent in this disclosure. It should be noted that ordinary persons skilled in the art can make certain variations and improvements without departing from the ideas in this disclosure, and these improvements and refinements fall within the protected scope of this disclosure. Therefore, the protected scope of this disclosure should be limited to the following claims.

Claims

Demands

1. A nuclear steam supply system, comprising: a nuclear power plant, a heat source circuit, a working fluid circuit, a steam consumer and a steam heat accumulator, wherein the nuclear power plant is connected to the heat source circuit, the working fluid circuit is connected to the steam consumer and the steam heat accumulator, the steam heat accumulator is connected to the steam consumer, and the heat source circuit and the working fluid circuit are independent of each other; the nuclear power plant is configured to form heating steam and supply the heating steam to the heat source circuit according to a nuclear power plant peak levelling load requirement;The heat source circuit is configured to take the supplied heating steam as a heat source, heat a clean working fluid in the working fluid circuit to form condensate, and supply the condensate to a secondary circuit of the nuclear power plant; the working fluid circuit is configured to heat the clean working fluid in the working fluid circuit to form clean steam meeting a steam parameter requirement of the steam consumer; in a case where the clean steam formed by the working fluid circuit is not less than a steam load requirement of the steam consumer, the working fluid circuit supplies the clean steam meeting the steam consumer load requirement to the steam consumer, and supplies clean steam exceeding the steam consumer load requirement to the heat accumulator for storage;and in a case where the clean steam formed by the working fluid circuit is less than the load requirement of the steam consumer, the working fluid circuit supplies the clean steam formed to the steam consumer, and the steam heat accumulator is combined with the working fluid circuit to form clean steam less than the load requirement of the steam consumer and supplies this steam to the steam consumer.

2. The nuclear steam supply system according to claim 1, comprising: a superheater, a steam generator, a drain tank, a secondary preheater and a primary preheater, in which a mutually insulated tube-side path and a shell-side path are disposed in each of the superheater, steam generator, secondary preheater and primary preheater; and 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 connected in sequence form the working fluid circuit.

3. The nuclear steam supply system according to claim 2, wherein the heat source circuit is a first heat source circuit, the nuclear power plant is a pressurized water reactor nuclear power plant, and the steam consumer is a low-pressure steam consumer; the superheater tube-side path, the steam generator tube-side path, the drain tank, the secondary preheater tube-side path and the primary preheater tube-side path connected in sequence form the first heat source circuit; and the superheater shell-side path is connected to the low-pressure consumer and the steam heat accumulator, and the steam heat accumulator is connected to the low-pressure steam consumer.

4. The nuclear steam supply system according to claim 2, wherein the working fluid circuit further comprises: a degasser and a secondary water supply pump; the degasser is disposed between the primary preheater and the secondary preheater, and the secondary water supply pump is disposed between the degasser and the secondary preheater.

5. The nuclear steam supply system according to claim 2, wherein the working fluid circuit further comprises: a demineralized water tank and a primary water supply pump; and the demineralized water tank is connected to the hull-side path of the primary preheater by the primary water supply pump.

6. The nuclear steam supply system according to claim 2, wherein the heat source circuit is formed by coupling a second heat source circuit and a third heat source circuit, the nuclear power plant is formed by coupling a pressurized water reactor nuclear power plant and a high-temperature reactor nuclear power plant, the consumer of steam includes a medium-pressure steam consumer, the pressurized water reactor nuclear power plant is connected to the second heat source circuit, and the high-temperature reactor nuclear power plant is connected to the third heat source circuit; the steam generator tube-side path, the drain tank, the secondary preheater tube-side path and the primary preheater tube-side path connected in sequence form the second heat source circuit; the superheater tube-side path is a third heat source circuit; the steam generator shell-side path is connected to the steam heat accumulator and the superheater shell-side path; and the superheater shell-side path is connected to the medium-pressure steam consumer and the steam heat accumulator.

7. The nuclear steam supply system according to claim 6, wherein the working fluid circuit further comprises: an electric heater; and the electric heater is connected to the steam heat accumulator and the medium pressure steam consumer.

8. The nuclear steam supply system according to claim 6, wherein the steam consumer further comprises: a low-pressure steam consumer; the working fluid circuit further comprises: a mixing tank; and the hull-side path of the steam generator, the steam heat accumulator, the hull-side path of the superheater and the low-pressure steam consumers are further connected to the mixing tank.

9. The nuclear steam supply system according to claim 1, wherein the steam heat accumulator is a storage device or a thermal storage device, which is selected according to a regulated steam load from the steam consumer and a peak levelling load from the nuclear power plant.

10. A nuclear steam supply method for operating the nuclear steam supply system according to any one of claims 1 to 9, which provides clean steam meeting a steam load requirement and a steam parameter requirement from a steam consumer to the steam consumer and meets a load levelling requirement for the peaks of the nuclear power plant, and comprising the following steps: The nuclear power plant generates heating steam and supplies the heating steam to the heat source circuit according to the peak levelling load requirement of the nuclear power plant; the heat source circuit takes the supplied heating steam as a heat source, heats a clean working fluid in the working fluid circuit to form condensate and supplies the condensate to a secondary circuit of the nuclear power plant; the working fluid circuit heats the clean working fluid in the working fluid circuit to form clean steam meeting the steam parameter requirement of the steam consumer;in a case where the clean steam formed by the working fluid circuit is not less than the steam load requirement of the steam consumer, the working fluid circuit supplies clean steam meeting the steam load requirement of the steam consumer to the steam consumer, and supplies clean steam exceeding the steam load requirement of the steam consumer to the steam heat accumulator for storage; and; In a case where the clean steam formed by the working fluid circuit is less than the steam load requirement of the steam consumer, the working fluid circuit supplies the clean steam formed to the steam consumer, and the steam heat accumulator forms clean steam less than the steam load requirement of the steam consumer and supplies the clean steam to the steam consumer.