High-temperature gas cooled nuclear power plant heat supply device and heat supply method

Abstract

The application relates to a high-temperature gas cooled reactor nuclear power plant heat supply device, which comprises a steam main pipeline, a power generation steam regulating valve, a main pipeline pressure detector, a heat supply mechanism and a control mechanism. The power generation steam regulating valve is connected between the steam main pipeline and a steam turbine, and the main pipeline pressure detector is arranged on the steam main pipeline; the heat supply mechanism is connected to the steam main pipeline. Through the high-temperature gas cooled reactor nuclear power plant heat supply device, high-temperature steam generated by a high-temperature gas cooled reactor nuclear island is respectively delivered to a steam turbine for power generation and to the heat supply mechanism for heat supply, so that the steam generated by the high-temperature gas cooled reactor is used for external heat supply, the demand of a large scene for a centralized heat source is met, and an original small-scale, low-efficiency and environment-impacted heat source point is replaced, and environmental pollution is further reduced. The application also relates to a high-temperature gas cooled reactor nuclear power plant heat supply method.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant heating technology, and in particular to a heating device and heating method for a high-temperature gas-cooled reactor nuclear power plant. Background Technology

[0002] More than 60% of my country's regions and over 50% of its population require winter heating. Currently, heating methods mainly consist of centralized heating and distributed heating. Centralized heating primarily relies on coal-fired combined heat and power (CHP) plants or coal-fired boilers, leading to significant resource consumption and environmental pollution. Nuclear energy, as a clean energy source, is characterized by low carbon emissions and cleanliness, making it an important future heating resource. Currently, nuclear heating primarily operates in two ways: cryogenic nuclear heating and nuclear CHP. Cryogenic nuclear heating technology utilizes a nuclear reactor primarily for heating, while nuclear CHP extracts exhaust steam from the high-pressure cylinders of nuclear power plants as a heat source, performs multi-stage heat exchange at heat exchange stations, and finally delivers the heat to users through the municipal heating network.

[0003] Nuclear combined heat and power (CHP) optimizes energy allocation and achieves high overall energy utilization. Domestic research on nuclear power plant heating systems primarily focuses on pressurized water reactor (PWR) units, mainly used for urban heating. However, due to the relatively low steam parameters of PWRs, their heating capacity is limited. High-temperature gas-cooled reactor (HTGR) nuclear power units, as the main type of fourth-generation nuclear power, can generate high-temperature steam (around 570°C) for steam power generation, significantly improving steam parameters. Furthermore, they can independently utilize secondary loop steam as a heat source for external heating, demonstrating great potential. Therefore, it is necessary to promote a method of external heating using steam generated by HTGRs to replace the original small-scale, inefficient, and environmentally impactful heat sources, further reducing environmental pollution. Summary of the Invention

[0004] Therefore, it is necessary to provide a heating device and method for a high-temperature gas-cooled reactor nuclear power plant that uses steam generated by a high-temperature gas-cooled reactor to provide external heating.

[0005] A heating device for a high-temperature gas-cooled reactor nuclear power plant, comprising:

[0006] The main steam pipeline connects to the high-temperature gas-cooled reactor nuclear island.

[0007] A power generation steam regulating valve is connected between the main steam pipeline and the steam turbine;

[0008] A main pipeline pressure detector is installed in the main steam pipeline;

[0009] Heating mechanism, connected to the main steam pipeline; and

[0010] The control mechanism is electrically connected to both the power generation steam regulating valve and the main pipeline pressure detector, and is used to adjust the opening degree of the power generation steam regulating valve according to the detection result of the main pipeline pressure detector.

[0011] By setting up the aforementioned high-temperature gas-cooled reactor nuclear power plant heating device, the high-temperature steam generated by the high-temperature gas-cooled reactor nuclear island is transported to the steam turbine power generation and heating mechanism through the main steam pipeline, so as to achieve the goal of using the steam generated by the high-temperature gas-cooled reactor to provide external heating, meet the needs of scenarios with large centralized heat source demand, and replace the original small-scale, inefficient heat source points with large environmental impact, further reducing environmental pollution.

[0012] Meanwhile, the heating unit adopts a heat-driven power generation operation mode, meaning that the amount of electricity generated is determined by the external heating energy output. Since the external power generation is dynamic, the total power requirement of the high-temperature gas-cooled reactor (HTGR) nuclear island can be determined based on the heating power demand range of the heating system and the relationship between heating power and turbine output power. This essentially fixes the power output of the HTGR nuclear island, reduces fluctuations in the HTGR nuclear island's output, and ensures the overall stability and reliability of the HTGR nuclear island.

[0013] Furthermore, in the case of operating under the heat-driven power generation mode, the external power generation is in a follow-up state, meaning the power generation steam regulating valve is in a follow-up state. When the amount of high-temperature steam output from the high-temperature gas-cooled reactor nuclear island changes, the actual pressure in the main steam pipeline also changes. The control mechanism obtains the actual pressure change in the main steam pipeline and adjusts the opening of the power generation steam regulating valve to ensure the stability of the heating system's external heat supply.

[0014] In one embodiment, the heating mechanism includes a steam generator, a superheater, and a heating main pipe. The steam generator and the superheater are both connected to the main steam pipe, and the steam generator is connected to the superheater, while the heating main pipe is connected to the superheater.

[0015] In one embodiment, the heating mechanism further includes a first heating steam regulating valve, a second heating steam regulating valve, a main pipe pressure detector, and a main pipe temperature detector. The first heating steam regulating valve is connected between the main steam pipeline and the steam generator, and the second heating steam regulating valve is connected between the main steam pipeline and the superheater.

[0016] Both the main pipe pressure detector and the main pipe temperature detector are installed on the heating main pipe. The control mechanism is also electrically connected to the first heating steam regulating valve, the second heating steam regulating valve, the main pipe pressure detector, and the main pipe temperature detector. The control mechanism is also used to adjust the opening degree of the first heating steam regulating valve according to the detection result of the main pipe pressure detector, and to adjust the opening degree of the second heating steam regulating valve according to the detection result of the main pipe temperature detector.

[0017] In one embodiment, the heating mechanism further includes a connecting pipe and an outlet temperature detector. The connecting pipe is connected between the steam generator and the superheater. The outlet temperature detector is disposed on the connecting pipe. The control mechanism is also electrically connected to the outlet temperature detector. The control mechanism is also used to adjust the opening degree of the second heating steam regulating valve according to the detection result of the outlet temperature detector.

[0018] In one embodiment, the control mechanism includes a first PID controller, a function generator, and a summer. The first PID controller is electrically connected to the main pipe temperature detector. The first PID controller is used to compare the detection result of the main pipe temperature detector with the preset temperature value of the main pipe and output a first control command.

[0019] The function generator is electrically connected to the outlet temperature detector and is used to output adjustment commands based on the detection results of the outlet temperature detector. The summer is also electrically connected to the first PID controller, the function generator, and the second heating steam regulating valve. The summer sums the first control command and the adjustment command to form an opening control command and sends the opening control command to the second heating steam regulating valve.

[0020] In one embodiment, the heating mechanism further includes multiple branch pipes and multiple branch steam regulating valves, each branch pipe being connected to the heating main pipe, and each branch steam regulating valve being respectively installed on a corresponding branch pipe.

[0021] In one embodiment, the heating mechanism further includes a main pipe flow detector and multiple branch flow detectors. The main pipe flow detector is disposed on the heating main pipe, and each branch flow detector is disposed on a corresponding branch pipe.

[0022] In one embodiment, the heating mechanism further includes a feedwater preheater, a deaerator, a feedwater pump, and a feedwater heater connected in sequence. The feedwater preheater is connected to the deaerator, the feedwater preheater is also connected to the inlet water pipe, and the feedwater heater is also connected to the steam generator.

[0023] In one embodiment, the heating mechanism further includes a first return pipe and a second return pipe, wherein the first return pipe is connected between the superheater and the feedwater preheater, and the second return pipe is connected between the feedwater preheater and the high-temperature gas-cooled reactor condenser.

[0024] In one embodiment, the heating mechanism further includes an inlet pipe, a third return pipe, and a fourth return pipe. The inlet pipe and the third return pipe are both connected between the steam generator and the feedwater heater, and the feedwater heater supplies water to the steam generator through the inlet pipe. The fourth return pipe is connected between the feedwater heater and the deaerator of the high-temperature gas-cooled reactor generator set.

[0025] A method for heating a high-temperature gas-cooled reactor nuclear power plant includes the following steps:

[0026] Obtain the actual pressure of the main steam pipeline;

[0027] Compare the actual pressure with the preset pressure of the main pipeline;

[0028] The opening of the power generation steam regulating valve is adjusted according to the comparison results to regulate the amount of high-temperature steam delivered to the steam turbine.

[0029] Specifically, when the actual pressure is greater than the preset pressure of the main pipeline, the opening of the power generation steam regulating valve is increased; conversely, when the actual pressure is less than the preset pressure of the main pipeline, the opening of the power generation steam regulating valve is decreased.

[0030] In one embodiment, the heating method further includes the step of:

[0031] Obtain the actual heating pressure and actual heating temperature of the heating main pipe;

[0032] The actual heating pressure is compared with the preset pressure of the main pipe, and the opening of the first heating steam regulating valve is adjusted according to the comparison result so that the actual heating pressure is stabilized at the preset pressure of the main pipe.

[0033] The actual heating temperature is compared with the preset temperature of the main pipe, and the opening of the second heating steam regulating valve is adjusted according to the comparison result so that the actual heating temperature is stabilized at the preset temperature of the main pipe.

[0034] In one embodiment, the heating method further includes the step of:

[0035] Obtain the saturated steam temperature at the outlet of the steam generator;

[0036] The opening degree of the second heating steam regulating valve is adjusted based on the comparison result between the actual heating temperature and the preset temperature of the main pipe, as well as the saturated steam temperature. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of a heating device provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of one control principle of a control mechanism provided in an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of another control principle of the control mechanism provided in an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of another control principle of a control mechanism provided in an embodiment of the present invention;

[0042] Figure 5 A flowchart illustrating the steps of a heating method provided in another embodiment of the present invention;

[0043] Figure 6 Another flowchart of a heating method provided in another embodiment of the present invention;

[0044] Figure 7 This is a flowchart of another step in a heating method provided in another embodiment of the present invention.

[0045] Label Explanation:

[0046] 100. Heating unit; 11. Steam main pipeline; 12. Power generation steam regulating valve; 13. Main pipeline pressure detector; 14. High-temperature gas-cooled reactor nuclear island; 15. Steam turbine; 16. Main pipeline temperature detector; 17. High-temperature gas-cooled reactor generator condenser; 18. High-temperature gas-cooled reactor generator deaerator;

[0047] 20. Heating system; 21. Steam generator; 22. Superheater; 23. Heating main pipe; 24. First heating steam regulating valve; 25. Second heating steam regulating valve; 26. Main pipe pressure detector; 27. Main pipe temperature detector; 28. Main pipe flow detector; 29. ​​Connecting pipe; 30. Outlet temperature detector; 31. Liquid level detector; 32. Feedwater preheater; 33. Deaerator; 34. Feedwater pump; 35. Feedwater heater; 36. Liquid level regulating valve; 37. First return pipe; 38. Second return pipe; 39. Inlet pipe; 40. Third return pipe; 41. Fourth return pipe; 42. Branch pipe; 43. Branch steam regulating valve; 44. Branch flow detector;

[0048] 51. First PID controller; 52. Function generator; 53. Summer; 54. Second PID controller; 55. Third PID controller. Detailed Implementation

[0049] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0055] like Figure 1 As shown, an embodiment of the present invention provides a heating device 100 for a high-temperature gas-cooled reactor nuclear power plant, including a main steam pipeline 11, a power generation steam regulating valve 12, a main pipeline pressure detector 13, a heating mechanism 20, and a control mechanism.

[0056] The main steam pipeline 11 is connected to the high-temperature gas-cooled reactor nuclear island 14. The main pipeline pressure detector 13 is installed on the main steam pipeline 11 to measure the actual pressure of the main steam pipeline 11. The power generation steam regulating valve 12 is connected between the main steam pipeline 11 and the turbine 15 to regulate the flow rate of steam delivered from the main steam pipeline 11 to the turbine 15.

[0057] The control mechanism is electrically connected to both the generator steam regulating valve 12 and the main pipeline pressure detector 13, and is used to adjust the opening degree of the generator steam regulating valve 12 according to the detection result of the main pipeline pressure detector 13.

[0058] The heating unit 20 is connected to the main steam pipeline 11 and is used to obtain steam from the main steam pipeline 11 and supply heat to users.

[0059] By setting up the aforementioned high-temperature gas-cooled reactor nuclear power plant heating device 100, the high-temperature steam generated by the high-temperature gas-cooled reactor nuclear island 14 is transported to the steam turbine 15 for power generation and the heating mechanism 20 for heating through the main steam pipeline 11, so as to achieve the goal of using the steam generated by the high-temperature gas-cooled reactor for external heating, meet the needs of scenarios with large centralized heat source demand, and replace the original small-scale, inefficient heat source points with large environmental impact, further reducing environmental pollution.

[0060] Meanwhile, the heating unit adopts a heat-driven power generation operation mode, meaning that the amount of external power generation is determined by the external heat output. Since the external power generation is in a dynamic state, the total power demand of the high-temperature gas-cooled reactor core island 14 can be determined based on the range of heat power demand of the heating unit 20 and the relationship between the heat power and the output power of the steam turbine 15. This essentially fixes the power output of the high-temperature gas-cooled reactor core island 14, reduces fluctuations in the high-temperature gas-cooled reactor core island 14, and ensures the overall stability and reliability of the high-temperature gas-cooled reactor core island 14.

[0061] Furthermore, in the case of operating in a heat-driven mode, the external power generation is in a follow-up state, that is, the power generation steam regulating valve 12 is in a follow-up state. When the amount of high-temperature steam output from the high-temperature gas-cooled reactor nuclear island 14 changes, the actual pressure in the main steam pipeline 11 will also change. The control mechanism obtains the actual pressure change in the main steam pipeline 11 and adjusts the opening of the power generation steam regulating valve 12 to ensure the stability of the external heat supply of the heating mechanism 20.

[0062] Specifically, when the high-temperature steam output from the high-temperature gas-cooled reactor nuclear island 14 increases, the actual pressure in the main steam pipeline 11 increases, while the heating regulation loop maintains the heating target value adjustment, that is, ensures the stability of the heating mechanism 20 in supplying heat to the outside. The control mechanism obtains the actual pressure change of the main steam pipeline 11, and then increases the opening of the power generation steam regulating valve 12, thereby increasing the power generation of the turbine 15.

[0063] When the high-temperature steam output from the high-temperature gas-cooled reactor nuclear island 14 decreases, the actual pressure in the main steam pipeline 11 decreases. Similarly, the control mechanism will reduce the opening of the power generation steam regulating valve 12, thus reducing the power generation of the turbine 15. It needs further explanation that the heating mechanism 20 is used to provide steam to users for heating. User demand is typically stable and fluctuates. To ensure the stability of heating, it is only necessary to stably supply a preset amount of high-temperature steam to the heating mechanism 20 according to user demand.

[0064] When the high-temperature steam output from the high-temperature gas-cooled reactor core island 14 increases, if the distribution is uneven, the excess high-temperature steam will be transported to the heating mechanism 20, making the amount of high-temperature steam transported to the heating mechanism 20 much greater than the user's demand. At this time, the excess high-temperature steam will be wasted, resulting in energy waste of the heating system.

[0065] Of course, it is understandable that when the high-temperature steam output from the high-temperature gas-cooled reactor nuclear island 14 decreases, the actual pressure in the main steam pipeline 11 decreases. The control mechanism can adjust the opening of the power generation steam regulating valve 12 according to the actual pressure change to ensure the stable operation of the heating mechanism 20.

[0066] In some embodiments, the heating system further includes a main pipe temperature detector 16, which is disposed on the main steam pipe 11 and is used to detect the temperature of the steam in the main steam pipe 11.

[0067] In some embodiments, the heating mechanism 20 includes a steam generator 21, a superheater 22, and a heating main pipe 23. The steam generator 21 and the superheater 22 are both connected to the main steam pipe 11, and the steam generator 21 is connected to the superheater 22, while the heating main pipe 23 is connected to the superheater 22.

[0068] High-temperature steam can heat the water in steam generator 21 into saturated steam. After the saturated steam enters superheater 22, the high-temperature steam can heat the saturated steam in superheater 22 into superheated steam, which is then transported to the user end for heating via heating main pipe 23.

[0069] In some embodiments, the heating mechanism 20 further includes a first heating steam regulating valve 24 and a second heating steam regulating valve 25. The first heating steam regulating valve 24 is connected between the main steam pipeline 11 and the steam generator 21 and is used to regulate the flow rate of high-temperature steam delivered to the steam generator 21. The second heating steam regulating valve 25 is connected between the main steam pipeline 11 and the superheater 22 and is used to regulate the amount of high-temperature steam delivered to the superheater 22.

[0070] It should be explained that adjusting the amount of high-temperature steam input to the steam generator 21 can adjust the amount of saturated steam produced by the steam generator, thereby adjusting the amount of steam delivered to the user. Adjusting the amount of high-temperature steam input to the superheater 22 can adjust the temperature of the superheated steam, that is, adjust the temperature of the steam delivered to the user.

[0071] Furthermore, the heating system 20 also includes a main pipe pressure detector 26 and a main pipe temperature detector 27. Both the main pipe pressure detector 26 and the main pipe temperature detector 27 are installed on the heating main pipe 23. The main pipe pressure detector 26 is used to detect the actual heating pressure of the heating main pipe 23, and the main pipe temperature detector 27 is used to detect the actual heating temperature of the heating main pipe 23. That is, the main pipe pressure detector 26 and the main pipe temperature detector 27 are used to detect the steam pressure and steam temperature delivered to the user end.

[0072] In practical applications, the control mechanism is also electrically connected to the first heating steam regulating valve 24, the second heating steam regulating valve 25, the main pipe pressure detector 26, and the main pipe temperature detector 27. The control mechanism is also used to adjust the opening degree of the first heating steam regulating valve 24 according to the detection result of the main pipe pressure detector 26, and to adjust the opening degree of the second heating steam regulating valve 25 according to the detection result of the main pipe temperature detector 27.

[0073] It should be noted that in order to ensure the stability of heating, it is necessary to ensure that the amount and temperature of steam delivered to the user end remain stable. Therefore, the preset pressure and preset temperature of the main pipe can be set in advance in the control mechanism.

[0074] When there is a deviation between the actual heating pressure detected by the main pipe pressure detector 26 and the preset pressure of the main pipe, the control mechanism will adjust the opening of the first heating steam regulating valve 24, thereby adjusting the amount of high-temperature steam input to the steam generator 21 and adjusting the amount of steam delivered to the user end, so as to ensure that the actual heating pressure is stable at the preset pressure of the main pipe.

[0075] When there is a deviation between the actual heating temperature detected by the main pipe temperature detector 27 and the preset temperature of the main pipe, the control mechanism will adjust the opening of the second heating steam regulating valve 25, thereby adjusting the amount of high-temperature steam input to the superheater 22 and adjusting the temperature of the superheated steam to ensure that the actual heating temperature is stable at the preset temperature of the main pipe.

[0076] It should be noted that the preset pressure and preset temperature of the main pipe can be a single point value or a range, and there are no restrictions here.

[0077] In some embodiments, the heating mechanism 20 further includes a main pipe flow detector 28, which is disposed on the heating main pipe 23 and is used to detect the steam flow rate through the heating main pipe 23, thereby obtaining the actual total amount of steam supplied.

[0078] In some embodiments, the heating mechanism 20 further includes a connecting pipe 29 and an outlet temperature detector 30. The connecting pipe 29 is connected between the steam generator 21 and the superheater 22. The outlet temperature detector 30 is disposed on the connecting pipe 29 and is used to detect the saturated steam temperature at the outlet of the steam generator 21 (the temperature of the saturated steam input to the superheater 22). The control mechanism is also electrically connected to the outlet temperature detector 30 to adjust the opening degree of the second heating steam regulating valve 25 according to the detection result of the outlet temperature detector 30.

[0079] It should be explained that temperature parameter adjustment has a slow response speed. In order to ensure the quality of superheated steam delivered to the user, the saturated steam temperature at the outlet of steam generator 21 is introduced at the same time, and the opening of the second heating steam regulating valve 25 is adjusted in advance according to the temperature change, thereby regulating the temperature of superheated steam.

[0080] In addition, the saturated steam temperature at the outlet of steam generator 21 is introduced as a feedforward for temperature regulation to effectively solve the problem of temperature signal hysteresis.

[0081] In some embodiments, the heating mechanism 20 further includes a liquid level detector 31 for detecting the liquid level in the steam generator 21.

[0082] In some embodiments, the heating mechanism 20 further includes a water preheater 32, a deaerator 33, a water pump 34 and a water heater 35 connected in sequence. The water preheater 32 is connected to both the water supply pipe and the deaerator 33, and the water heater 35 is also connected to the steam generator 21.

[0083] After receiving the incoming water, the feedwater preheater 32 preheats it and then sends the preheated water to the deaerator 33. After the deaerator 33 deoxygenates the water, it is pumped to the feedwater heater 35 by the feedwater pump 34. The feedwater heater 35 heats the water and then sends it to the steam generator 21.

[0084] In practical applications, the heating mechanism 20 also includes a liquid level regulating valve 36, which is connected between the water supply pump 34 and the water supply heater 35.

[0085] Understandably, the control mechanism can adjust the opening of the liquid level regulating valve 36 according to the detection result of the liquid level detector 31, so as to add water to the steam generator 21 when the liquid level in the steam generator 21 is low, thereby regulating the liquid level in the steam generator 21.

[0086] In some embodiments, the heating mechanism 20 further includes a first return pipe 37, which is connected between the superheater 22 and the feedwater preheater 32, and is used to guide the high-temperature steam heated by the superheater 22 into the feedwater preheater 32 to preheat the water in the feedwater preheater 32.

[0087] Furthermore, the heating structure also includes a second return pipe 38, which is connected to the feedwater preheater 32 and the high-temperature gas-cooled reactor generator condenser 17, and is used to guide steam into the high-temperature gas-cooled reactor generator condenser 17.

[0088] In some embodiments, the heating mechanism 20 further includes an inlet pipe 39 and a third return pipe 40. The inlet pipe 39 and the third return pipe 40 are both connected between the steam generator 21 and the feedwater heater 35. The feedwater heater 35 supplies water to the steam generator 21 through the inlet pipe 39. The liquid level regulating valve 36 is provided in the inlet pipe 39. The third return pipe 40 is used to guide the high-temperature steam that has been heated in the steam generator 21 into the feedwater heater 35, thereby heating the water in the feedwater heater 35.

[0089] In practical applications, the heating mechanism 20 also includes a fourth return pipe 41, which is connected between the feedwater heater 35 and the deaerator 18 of the high-temperature gas-cooled reactor generator set, and is used to guide steam into the deaerator 18 of the high-temperature gas-cooled reactor generator set.

[0090] It is understandable that by setting up the first return pipe 37, the second return pipe 38, and the third return pipe 40, steam can be reused multiple times, thereby improving the utilization rate of heat in the steam, that is, improving the energy utilization rate.

[0091] In some embodiments, the heating mechanism 20 further includes multiple branch pipes 42, each branch pipe 42 being connected to the heating main pipe 23, and the multiple branch pipes 42 being used to deliver steam to multiple users respectively.

[0092] Furthermore, the heating mechanism 20 also includes multiple branch steam regulating valves 43, each branch steam regulating valve 43 being installed on a corresponding branch pipe 42 to regulate the flow rate of the corresponding branch pipe 42.

[0093] In some embodiments, the heating mechanism 20 further includes a plurality of branch flow detectors 44, each branch flow detector 44 being disposed on a corresponding branch pipe 42 to detect the flow rate of steam flowing through the corresponding branch pipe 42.

[0094] Please see Figure 2 In some embodiments, the control mechanism includes a first PID (Proportional, Integral and Derivative) controller 51, which is electrically connected to both the main pipe temperature detector 27 and the second heating steam regulating valve 25. The first PID controller 51 is used to compare the detection result of the main pipe temperature detector 27 with the preset temperature of the main pipe and output a first control command to the second heating steam regulating valve 25 to adjust the opening of the second heating steam regulating valve 25, thereby ensuring that the actual heating temperature is stable at the preset temperature of the main pipe.

[0095] It should be noted that the purpose of adjusting the opening of the second heating steam regulating valve 25 is to ensure that the actual heating temperature is stable at the preset temperature of the main pipe. During the adjustment process, if the temperature is too high, the opening should be reduced, and if the temperature is too low, the opening should be increased. This will not be elaborated here.

[0096] In some embodiments, the control mechanism further includes a function generator 52 and a summer 53. The function generator 52 is electrically connected to the outlet temperature detector 30 and is used to output an adjustment command based on the detection result of the outlet temperature detector 30. The summer 53 is connected between the first PID controller 51 and the second heating steam regulating valve 25, and the summer 53 is also electrically connected to the function generator 52. The summer 53 is used to sum the first control command and the adjustment command to form an opening control command, and to send the opening control command to the second heating steam regulating valve 25, thereby adjusting the opening of the second heating steam regulating valve 25.

[0097] It should be noted that the function in the function generator 52 adopts the interval fixed value method. Specifically, a function output value is determined based on the saturated steam temperature detected by the outlet temperature detector 30. That is, when the saturated steam temperature is within a certain temperature range, the function calculator outputs a corresponding adjustment command.

[0098] It should be noted that the temperature range and corresponding adjustment instructions mentioned above can be determined based on on-site testing, and will not be elaborated here.

[0099] Please see Figure 3 In some embodiments, the control mechanism further includes a second PID controller 54, which is electrically connected to both the main pipeline pressure detector 13 and the generator steam regulating valve 12. The second PID controller 54 is used to compare the actual pressure of the main steam pipeline 11 with the preset pressure of the main pipeline, and then output a second control command to the generator steam regulating valve 12 according to the comparison result to adjust the opening degree of the generator steam regulating valve 12.

[0100] Specifically, when the actual pressure is greater than the preset pressure of the main pipeline, the opening of the power generation steam regulating valve 12 is increased; conversely, the opening of the power generation steam regulating valve 12 is decreased.

[0101] Please see Figure 4 In some embodiments, the control mechanism further includes a third PID controller, which is electrically connected to both the main pipe pressure detector 26 and the first heating steam regulating valve 24. The third PID controller is used to compare the actual heating pressure of the heating main pipe 23 with the preset pressure of the main pipe, and then outputs a third control command to the first heating steam regulating valve 24 according to the comparison result, so as to adjust the opening of the first heating steam regulating valve 24, thereby ensuring that the actual heating pressure is stable at the preset pressure of the main pipe.

[0102] It should be noted that, in conjunction with the above embodiments, the control between the first PID controller 51, the second PID controller 54 and the third PID controller can be coordinated with each other to achieve combined control of heating steam pressure and temperature, and the power generation steam regulating valve 12 is in a follow-up state.

[0103] For example, to ensure that the actual heating pressure in the heating main pipe 23 remains stable at the preset pressure and the actual heating temperature remains stable at the preset temperature, the opening of the first heating steam regulating valve 24 and / or the second heating steam regulating valve 25 can be adjusted. After adjusting the opening of the first heating steam regulating valve 24 and / or the second heating steam regulating valve 25, if the pressure of the main steam pipeline 11 is affected, the second PID controller 54 will also adjust the opening of the power generation steam regulating valve 12 accordingly, that is, adjust the power generation of the turbine 15.

[0104] In addition, the preset pressure of the main pipeline, the preset pressure of the header pipe, and the preset temperature of the header pipe can all be determined according to the actual situation and on-site commissioning, and no restrictions are imposed here.

[0105] like Figure 5 As shown, the present invention also provides a heating method for a high-temperature gas-cooled reactor nuclear power plant, the heating method comprising the following steps:

[0106] S110, obtain the actual pressure of the main steam pipeline 11.

[0107] Specifically, the actual pressure of the steam main pipeline 11 can be detected and obtained through the main pipeline pressure detector 13.

[0108] S120 compares the actual pressure with the preset pressure of the main pipeline.

[0109] S130, adjust the opening of the power generation steam regulating valve 12 according to the comparison result, so as to regulate the amount of high-temperature steam delivered to the steam turbine 15.

[0110] Specifically, when the actual pressure is greater than the preset pressure of the main pipeline, the opening of the power generation steam regulating valve 12 is increased; conversely, the opening of the power generation steam regulating valve 12 is decreased.

[0111] By employing the aforementioned high-temperature gas-cooled reactor nuclear power plant heating method, when the amount of high-temperature steam in the main steam pipe 11 increases, the actual pressure within the main steam pipe 11 increases, exceeding the preset pressure of the main pipe. Subsequently, the opening of the power generation steam regulating valve 12 is increased to further increase the high-temperature steam input to the turbine 15. In this way, while ensuring stable heating, the increased high-temperature steam can be used for power generation, avoiding energy waste.

[0112] Please see Figure 6 In some embodiments, the heating method for a high-temperature gas-cooled reactor nuclear power plant further includes the step of:

[0113] S210, obtain the actual heating pressure of the heating main pipe 23.

[0114] Specifically, the actual heating pressure of the heating main pipe 23 can be detected and obtained through the main pipe pressure detector 26.

[0115] S220 compares the actual heating pressure with the preset pressure of the main pipe, and adjusts the opening of the first heating steam regulating valve 24 according to the comparison result so that the actual heating pressure is stabilized at the preset pressure of the main pipe.

[0116] Please see Figure 7 In some embodiments, the heating method for a high-temperature gas-cooled reactor nuclear power plant further includes the step of:

[0117] S310, obtain the actual heating temperature of the heating main pipe 23.

[0118] Specifically, the actual heating temperature of the heating main pipe 23 can be obtained by detecting the main pipe temperature detector 27.

[0119] S320 compares the actual heating temperature with the preset temperature of the main pipe, and adjusts the opening of the second heating steam regulating valve 25 according to the comparison result so that the actual heating temperature is stabilized at the preset temperature of the main pipe.

[0120] It is understandable that the steam in the heating main pipe 23 is delivered to the user end. By stabilizing the actual heating pressure and actual heating temperature at the preset pressure and preset temperature of the main pipe, the stability of the heating supply can be guaranteed.

[0121] It should also be explained that when the preset pressure and preset temperature are point values, the pressure stabilizing at the preset pressure and the temperature stabilizing at the preset temperature means that within the detection accuracy range of the pressure detector and the temperature detector, the values ​​detected by the pressure detector and the temperature detector are equal to the preset pressure and the preset temperature.

[0122] In some embodiments, the heating method for a high-temperature gas-cooled reactor nuclear power plant further includes the step of:

[0123] Obtain the saturated steam temperature at the outlet of steam generator 21.

[0124] Specifically, the saturated steam temperature at the outlet of the steam generator 21 can be detected and obtained by the outlet temperature detector 30.

[0125] The opening degree of the second heating steam regulating valve 25 is adjusted based on the comparison between the actual heating temperature and the preset temperature of the main pipe, as well as the saturated steam temperature.

[0126] It should be explained that the specific adjustment method in step S232 has been described in the above embodiments, that is, the adjustment method of the first PID controller 51, function generator 52 and other structures, so it will not be repeated here.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A heating device for a high-temperature gas-cooled reactor nuclear power plant, characterized in that, include: A main steam pipeline is connected to the high-temperature gas-cooled reactor nuclear island; a power generation steam regulating valve is connected between the main steam pipeline and the steam turbine; a main pipeline pressure detector is installed on the main steam pipeline; a heating mechanism is connected to the main steam pipeline; and a control mechanism is electrically connected to both the power generation steam regulating valve and the main pipeline pressure detector, used to adjust the opening of the power generation steam regulating valve according to the detection result of the main pipeline pressure detector. The heating mechanism includes a steam generator, a superheater, and a heating main pipe. The steam generator and the superheater are both connected to the main steam pipe, and the steam generator is connected to the superheater, while the heating main pipe is connected to the superheater. The heating mechanism further includes a first heating steam regulating valve, a second heating steam regulating valve, a main pipe pressure detector, and a main pipe temperature detector. The first heating steam regulating valve is connected between the main steam pipeline and the steam generator, and the second heating steam regulating valve is connected between the main steam pipeline and the superheater. The main pipe pressure detector and the main pipe temperature detector are both installed on the heating main pipe. The control mechanism is also electrically connected to the first heating steam regulating valve, the second heating steam regulating valve, the main pipe pressure detector, and the main pipe temperature detector. The control mechanism is also used to adjust the opening degree of the first heating steam regulating valve according to the detection result of the main pipe pressure detector, and to adjust the opening degree of the second heating steam regulating valve according to the detection result of the main pipe temperature detector.

2. The heating device for a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, The heating mechanism also includes a connecting pipe and an outlet temperature detector. The connecting pipe is connected between the steam generator and the superheater. The outlet temperature detector is installed on the connecting pipe. The control mechanism is also electrically connected to the outlet temperature detector. The control mechanism is also used to adjust the opening degree of the second heating steam regulating valve according to the detection result of the outlet temperature detector.

3. The heating device for a high-temperature gas-cooled reactor nuclear power plant according to claim 2, characterized in that, The control mechanism includes a first PID controller, a function generator, and a summer. The first PID controller is electrically connected to the main pipe temperature detector and is used to compare the detection result of the main pipe temperature detector with the preset temperature value of the main pipe and output a first control command. The function generator is electrically connected to the outlet temperature detector and is used to output an adjustment command based on the detection result of the outlet temperature detector. The summer is electrically connected to the first PID controller, the function generator, and the second heating steam regulating valve. The summer sums the first control command and the adjustment command to form an opening control command and sends the opening control command to the second heating steam regulating valve.

4. The heating device for a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, The heating mechanism also includes multiple branch pipes and multiple branch steam regulating valves. Each branch pipe is connected to the heating main pipe, and each branch steam regulating valve is respectively installed on a corresponding branch pipe.

5. The heating device for a high-temperature gas-cooled reactor nuclear power plant according to claim 4, characterized in that, The heating mechanism also includes a main pipe flow detector and multiple branch flow detectors. The main pipe flow detector is installed on the heating main pipe, and each branch flow detector is installed on a corresponding branch pipe.

6. The heating device for a high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, The heating mechanism further includes a feedwater preheater, a deaerator, a feedwater pump, and a feedwater heater connected in sequence. The feedwater preheater is connected to the deaerator, the feedwater preheater is also connected to the inlet water pipe, and the feedwater heater is also connected to the steam generator.

7. The heating device for a high-temperature gas-cooled reactor nuclear power plant according to claim 6, characterized in that, The heating mechanism further includes a first return pipe and a second return pipe. The first return pipe is connected between the superheater and the feedwater preheater, and the second return pipe is connected between the feedwater preheater and the condenser of the high-temperature gas-cooled reactor generator set.

8. The heating device for a high-temperature gas-cooled reactor nuclear power plant according to claim 6, characterized in that, The heating mechanism also includes an inlet pipe, a third return pipe, and a fourth return pipe. The inlet pipe and the third return pipe are both connected between the steam generator and the feedwater heater. The feedwater heater supplies water to the steam generator through the inlet pipe. The fourth return pipe is connected between the feedwater heater and the deaerator of the high-temperature gas-cooled reactor generator set.

9. A heating method for a high-temperature gas-cooled reactor nuclear power plant, characterized in that, The heating method for the high-temperature gas-cooled reactor nuclear power plant is implemented by the high-temperature gas-cooled reactor nuclear power plant heating device as described in any one of claims 1 to 8; The method includes the following steps: obtaining the actual pressure of the main steam pipeline; comparing the actual pressure with the preset pressure of the main pipeline; adjusting the opening of the power generation steam regulating valve according to the comparison result to regulate the amount of high-temperature steam delivered to the turbine; wherein, when the actual pressure is greater than the preset pressure of the main pipeline, the opening of the power generation steam regulating valve is increased; otherwise, the opening of the power generation steam regulating valve is decreased.

10. The heating method for a high-temperature gas-cooled reactor nuclear power plant according to claim 9, characterized in that, The heating method further includes the steps of: obtaining the actual heating pressure and actual heating temperature of the heating main pipe; comparing the actual heating pressure with the preset pressure of the main pipe, and adjusting the opening of the first heating steam regulating valve according to the comparison result to stabilize the actual heating pressure at the preset pressure of the main pipe; comparing the actual heating temperature with the preset temperature of the main pipe, and adjusting the opening of the second heating steam regulating valve according to the comparison result to stabilize the actual heating temperature at the preset temperature of the main pipe.

11. The heating method for a high-temperature gas-cooled reactor nuclear power plant according to claim 10, characterized in that, The heating method further includes the steps of: obtaining the saturated steam temperature at the outlet of the steam generator; and adjusting the opening of the second heating steam regulating valve based on the comparison result between the actual heating temperature and the preset temperature of the main pipe and the saturated steam temperature.

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