Residual pressure and waste heat recovery system of high-temperature gas cooled reactor

Abstract

According to the technical scheme, the excess pressure and waste heat recovery system of the high-temperature gas cooled reactor comprises the high-pressure fluid collecting box, the low-pressure fluid collecting box and at least one series sequence power generation device connected between the high-pressure fluid collecting box and the low-pressure fluid collecting box in series. An inlet of the high-pressure fluid collecting box is connected with a secondary loop medium outlet of a heat exchange station of the high-temperature gas cooled reactor, an outlet of the high-pressure fluid collecting box is communicated with a device inlet of the series sequence power generation device, a device outlet of the series sequence power generation device is communicated with an inlet of the low-pressure fluid collecting box, and an outlet of the low-pressure fluid collecting box is communicated with an inlet of a deoxidizing and dosing system of the high-temperature gas cooled reactor; and the series sequence power generation device generates power based on the residual pressure and the residual heat of the secondary circuit medium flowing through the series sequence power generation device, and outputs the generated power to equipment in a plant or a power grid. According to the system, power generation can be carried out while pressure reduction and temperature reduction are carried out on a secondary loop medium, waste of waste heat and waste heat is avoided, and therefore the power generation efficiency is improved on the whole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power plants, and more particularly to a residual pressure and residual heat recovery system of a high-temperature gas cooled reactor. BACKGROUND

[0002] Unlike the conventional nuclear power supply mode, the heat supply station of the high-temperature gas cooled reactor is composed of three loops, wherein the heat supply of the third loop is generated by heat exchange between the second loop medium and the fresh water of the third loop through the heat exchange station, at this time, the enthalpy value of the second loop medium decreases rapidly after passing through the heat exchange station, and the pressure drop is not obvious. At the same time, before the second loop medium enters the deoxidizing and dosing system of the conventional island, it needs to be treated by reducing pressure and temperature, thereby causing waste of part of the residual pressure and residual heat. SUMMARY

[0003] Therefore, the present application provides a residual pressure and residual heat recovery system of a high-temperature gas cooled reactor, which is used for reducing pressure and temperature of the second loop medium before entering the deoxidizing and dosing system of the conventional island, and generating power at the same time, so as to realize energy saving and power increasing.

[0004] In order to achieve the above purpose, the present application provides the following scheme:

[0005] A residual pressure and residual heat recovery system of a high-temperature gas cooled reactor, the residual pressure and residual heat recovery system comprises a high-pressure fluid header, a low-pressure fluid header, and at least one series sequence power generation device connected in series between the high-pressure fluid header and the low-pressure fluid header, wherein:

[0006] The inlet of the high-pressure fluid header is connected with the outlet of the second loop medium of the heat exchange station of the high-temperature gas cooled reactor, and the outlet is communicated with the device inlet of the series sequence power generation device, the device outlet of the series sequence power generation device is communicated with the inlet of the low-pressure fluid header, and the outlet of the low-pressure fluid header is communicated with the inlet of the deoxidizing and dosing system of the high-temperature gas cooled reactor.

[0007] The series sequence power generation device generates power based on the residual pressure and residual heat of the second loop medium flowing therethrough, and outputs the generated power to the plant equipment or power grid of the high-temperature gas cooled reactor.

[0008] Optionally, the series sequence power generation device comprises at least one thermal power stabilizer and at least one hydraulic turbine power generation device.

[0009] Optionally, the number of impeller stages of the hydraulic turbine power generation device is less than or equal to a preset number of stages.

[0010] Optionally, the preset number of stages is 6.

[0011] Optionally, the thermoelectric current stabilizer comprises a box body and a plurality of thermoelectric modules arranged on the outer wall of the box body, the thermoelectric modules generate electricity based on the waste heat of the secondary circuit medium flowing through the box body.

[0012] Optionally, a flow guide fin is arranged in the axial direction in the box body.

[0013] Optionally, the pressure difference reduced by each hydraulic turbine device is not more than 4 MPa. When the pipeline pressure difference between the high-pressure fluid header tank and the low-pressure fluid header tank is less than 4 MPa, the thermoelectric current stabilizer is a primary level, and the hydraulic turbine power generation device is a primary level.

[0014] When the pipeline pressure difference is between 4 MPa and 8 MPa, the thermoelectric current stabilizer is a two-stage, and the hydraulic turbine power generation device is a two-stage.

[0015] When the pipeline pressure difference is between 8 MPa and 12 MPa, the thermoelectric current stabilizer is a two-stage, and the hydraulic turbine power generation device is a three-stage.

[0016] Optionally, the series sequence power generation device further comprises a front-end regulating valve connected in series between the high-pressure fluid header tank and the hydraulic turbine power generation device, and a turbine regulating valve connected in series between the hydraulic turbine power generation device and the low-pressure fluid header tank, wherein:

[0017] The front-end regulating valve is used to regulate the flow of the secondary circuit medium entering the series sequence power generation device. The turbine regulating valve is used to regulate the flow resistance of the hydraulic turbine device to ensure the required pressure of the low-pressure fluid header tank.

[0018] Optionally, the excess pressure and waste heat recovery system can be formed by a plurality of series sequence power generation devices in parallel sequence, wherein:

[0019] When the working flow of the hydraulic turbine power generation device is less than a first threshold value and greater than or equal to a second threshold value, the flow is balanced by controlling the opening degree of the front-end regulating valve of each column of the series sequence power generation device, and the resistance of the hydraulic turbine power generation device is reduced by controlling the opening degree of the turbine regulating valve.

[0020] When the working flow of the hydraulic turbine power generation device is less than the second threshold value, part of the front-end regulating valve is closed, and the flow of the remaining column of the series sequence power generation device is balanced by controlling the opening degree of the remaining front-end regulating valve.

[0021] Optionally, the first threshold value is 80% of the rated flow of the single hydraulic turbine power generation device, and the second threshold value is 60% of the rated flow.

[0022] It can be seen from the technical solution that the application discloses a residual pressure and residual heat recovery system of a high-temperature gas cooled reactor, which comprises a high-pressure fluid header, a low-pressure fluid header, and at least one series sequence power generation device connected in series between the high-pressure fluid header and the low-pressure fluid header. The inlet of the high-pressure fluid header is connected with the outlet of the secondary circuit medium of a heat exchange station of the high-temperature gas cooled reactor, and the outlet is communicated with the device inlet of the series sequence power generation device; the device outlet of the series sequence power generation device is communicated with the inlet of the low-pressure fluid header, and the outlet of the low-pressure fluid header is communicated with the inlet of an oxygen removal and chemical dosing system of the high-temperature gas cooled reactor; the series sequence power generation device generates power based on the residual pressure and residual heat of the secondary circuit medium flowing therethrough, and outputs the generated power to the power system or power grid of the high-temperature gas cooled reactor. The system can realize power generation while reducing the pressure and temperature of the secondary circuit medium, avoids waste of residual heat and residual temperature, and thus improves the power generation efficiency as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 FIG. 1 is a schematic diagram of a residual pressure and residual heat recovery system of a high-temperature gas cooled reactor according to an embodiment of the present application;

[0025] Figure 2 FIG. 2 is a side view of a thermoelectric current stabilizer of the residual pressure and residual heat recovery system according to the embodiment of the present application;

[0026] Figure 3 FIG. 3 is a sectional view of the thermoelectric current stabilizer of the residual pressure and residual heat recovery system according to the embodiment of the present application;

[0027] Figure 4 FIG. 4 is a schematic diagram of another residual pressure and residual heat recovery system of a high-temperature gas cooled reactor according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] Given that the secondary circuit medium of a high-temperature gas-cooled reactor needs to be deoxygenated and dosed after passing through a heat exchange station, it must also be cooled and depressurized to meet the operating requirements of deoxygenation and dosing. This will cause pressure and temperature losses. To this end, this application provides a residual pressure and residual heat recovery system. This system is applied to the secondary circuit of a high-temperature gas-cooled reactor and is used to convert residual pressure and residual heat into electrical energy while achieving pressure and temperature reduction, thereby avoiding waste of residual pressure and residual heat and improving power generation efficiency. The specific solution is as follows:

[0030] The present application provides a high temperature gas cooled reactor residual pressure and heat recovery system, the system includes a high pressure fluid header 8 and a low pressure fluid header 7, such as Figure 1 As shown, the system also includes a series sequence power generation device connected in series between the two. The inlet of the high-pressure fluid manifold is connected to the outlet of the secondary circuit medium of the heat exchange station, so that the secondary circuit medium flows through the heat exchange station and enters the high-pressure fluid manifold; the outlet of the high-pressure fluid manifold is connected to the device inlet of the series sequence power generation device, and the device outlet of the series sequence power generation device is connected to the inlet of the low-pressure fluid manifold, and the outlet of the low-pressure fluid manifold is connected to the inlet of the deoxygenation and dosing system of the high-temperature gas-cooled reactor. As a result, the residual pressure and residual heat recovery system of the present application becomes part of the secondary circuit of the high-temperature gas-cooled reactor, allowing the secondary circuit medium to complete a complete circulation process through the system.

[0031] like Figure 1 As shown, the series-connected power generation device of the present application includes a front-end regulating valve 1, at least one thermoelectric flow regulator connected in series after the front-end regulating valve, and at least one hydraulic turbine power generation device. Specifically, in this embodiment, the device includes a first-stage thermoelectric flow regulator 2 and a second-stage thermoelectric flow regulator 4. The hydraulic turbine power generation device includes a first-stage hydraulic turbine power generation device 3 and a second-stage hydraulic turbine power generation device 5. The front-end regulating valve is used to control the flow rate of the secondary circuit medium flowing through the series-connected power generation device by controlling its opening. The series-connected power generation device is used to generate electricity based on the pressure and temperature of the secondary circuit medium flowing therethrough, that is, it generates electricity while simultaneously reducing the pressure and temperature of the secondary circuit medium, thereby avoiding waste of excess pressure and excess temperature.

[0032] Each stage of the hydraulic turbine power generation system includes a hydraulic turbine and a generator 6 coupled to the hydraulic turbine. Each stage is also equipped with a turbine regulating valve 9, which regulates the flow rate through the hydraulic turbine to adjust the resistance of the hydraulic turbine and ensure the required pressure at the end.

[0033] The above-mentioned thermoelectric stabilizer generates electricity based on the temperature of the secondary circuit medium, and cools the secondary circuit medium while generating electricity. The thermoelectric stabilizer includes a box body, which is used to flow through the secondary circuit medium, and a plurality of Seebeck thermoelectric elements are arranged on the outer wall of the box body, such as Figure 2 As shown, a guide fin is provided inside the device. Figure 3As shown, this Seebeck thermoelectric element array is geometrically connected in series. The Seebeck elements adhere tightly to the outer wall of a tube or elbow, and the contact surface is filled with a thermal conductive agent such as silicone grease or thermal oil. Furthermore, rectifiers are arranged within the tubular flow channel of the thermoelectric stabilizer, which also serves as heat transfer fins, effectively transferring heat from the fluid in the tube to the Seebeck elements. This helps to guide and stabilize the flow, eliminate mutual influence between the two turbines, and enhance heat transfer. The thermoelectric stabilizer can be installed in either a straight tube or elbow configuration, depending on the requirements of the liquid turbine equipment.

[0034] Thermoelectric elements are connected in series or in series-parallel according to a certain rule, and output direct current based on waste heat. After inversion, the direct current is converted into alternating current with the same frequency as the alternating current generated by the hydraulic turbine generator. The two are combined to supply power to equipment in the factory or to the power grid.

[0035] In addition, to adapt to the operating conditions of different application scenarios, the number of thermoelectric stabilizers and hydraulic turbine generators in series can be adjusted, with the number of impeller stages of the hydraulic turbine generator not exceeding 6. When the pipeline pressure difference between the high-pressure fluid header and the low-pressure fluid header is less than 4MPa, one thermoelectric stabilizer and one hydraulic turbine generator are required; when the pipeline pressure difference is between 4MPa and 8MPa, two thermoelectric stabilizers and two hydraulic turbine generators are required; when the pipeline pressure difference is between 8MPa and 12MPa, two thermoelectric stabilizers and three hydraulic turbine generators are required.

[0036] Also, the series sequence power generation device in this application is not limited to one, e.g. Figure 4 As shown, there is provided a series sequence power generation device including three parallel connected ones. In order to adapt to different flow rates of secondary circuit media, the present application adopts the following control strategy.

[0037] When the operating flow rate of the hydraulic turbine generator set is less than the first threshold and greater than or equal to the second threshold, the flow rate is balanced by controlling the opening of the regulating valve at the front end of each series-series generator set, thereby reducing the resistance of the hydraulic turbine equipment and ensuring the required pressure at the end. At this time, all series-series generator sets are put into operation.

[0038] When the operating flow rate of a hydraulic turbine generator set falls below a second threshold, some of the front-end regulating valves are closed, and the flow rate of the remaining series-series generator sets is balanced by controlling the opening of the remaining front-end regulating valves. This ensures that the operating series generator sets always operate within a reasonable operating range by shutting down some series-series generator sets and directing the flow rate to other series-series generator sets. The first threshold is 80% of the rated flow rate of a single hydraulic turbine generator set, and the second threshold is 60% of its rated flow rate.

[0039] From the above technical solution can be seen, the embodiment provides a kind of high temperature gas cooled reactor's excess pressure waste heat recovery system, including high-pressure fluid header, low-pressure fluid header, at least one series sequence power generation device being connected in series between high-pressure fluid header and low-pressure fluid header.The import of high-pressure fluid header is connected with the outlet of secondary circuit medium of heat exchange station of high temperature gas cooled reactor, outlet is communicated with the device entrance of series sequence power generation device, the device outlet of series sequence power generation device is communicated with the import of low-pressure fluid header, and the outlet of low-pressure fluid header is communicated with the import of oxygen removal dosing system of high temperature gas cooled reactor;Series sequence power generation device generates electricity based on the excess pressure and waste heat of the secondary circuit medium flowing therein, and exports the power generated to the power system of high temperature gas cooled reactor.The system can realize the power generation while depressurizing and cooling secondary circuit medium, avoids the waste of waste heat, to improve the power generation efficiency as a whole.

[0040] In addition, the excess pressure waste heat recovery system of the application can not only be applied to the recovery of the excess pressure waste heat of the high temperature gas cooled reactor, but also can be applied to other thermal power systems using fluid working medium for power generation or heating, such as coal-fired generator set, gas-fired generator set, straw-fired generator set, etc.

[0041] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0042] Although the preferred embodiments of the embodiments of the application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the application.

[0043] Finally, it should be noted that, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal device. Without more limitation, the element defined by the statement "including a …" does not exclude the presence of another identical element in the process, method, article or terminal device including the element.

[0044] The technical solutions provided by the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the examples is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description should not be understood as a limitation on the present application.

Claims

1. A waste heat recovery system for a high temperature gas-cooled reactor, characterized in that: The waste pressure and waste heat recovery system includes a high-pressure fluid manifold, a low-pressure fluid manifold, and at least one series-connected power generation device connected in series between the high-pressure fluid manifold and the low-pressure fluid manifold, wherein: The inlet of the high-pressure fluid header is connected to the outlet of the secondary circuit medium of the heat exchange station of the high-temperature gas-cooled reactor, and the outlet is communicated with the device inlet of the series-sequence power generation device. The device outlet of the series-sequence power generation device is communicated with the inlet of the low-pressure fluid header, and the outlet of the low-pressure fluid header is communicated with the inlet of the deoxygenation and dosing system of the high-temperature gas-cooled reactor. The series sequence power generation device generates electricity based on the residual pressure and residual heat of the secondary circuit medium flowing through it, and outputs the generated electricity to the in-plant equipment or the power grid.

2. The waste pressure and waste heat recovery system according to claim 1, characterized in that: The series sequence power generation device includes at least one thermoelectric current stabilizer and at least one hydraulic turbine power generation device.

3. The waste pressure and waste heat recovery system according to claim 2, characterized in that: The impeller stage number of the hydraulic turbine power generation device is less than or equal to the preset stage number.

4. The waste pressure and waste heat recovery system according to claim 3, characterized in that: The preset number of levels is 6.

5. The waste pressure and waste heat recovery system according to claim 2, characterized in that: The thermoelectric stabilizer includes a housing and a plurality of thermoelectric modules disposed on an outer wall of the housing. The thermoelectric modules generate electricity based on waste heat of a secondary circuit medium flowing through the housing.

6. The waste pressure and waste heat recovery system according to claim 5, characterized in that: Guide fins are also provided in the axial direction of the box body.

7. The waste pressure and waste heat recovery system according to claim 2, characterized in that: The pressure difference reduced by each hydraulic turbine device does not exceed 4MPa; When the pipeline pressure difference between the high-pressure fluid manifold and the low-pressure fluid manifold is less than 4 MPa, the thermoelectric flow stabilizer is a first-stage device and the hydraulic turbine power generation device is a first-stage device; When the pipeline pressure difference is between 4MPa and 8MPa, the thermoelectric stabilizer is two-stage and the hydraulic turbine power generation device is two-stage; When the pipeline pressure difference is between 8 MPa and 12 MPa, the thermoelectric stabilizer is two-stage and the hydraulic turbine power generation device is three-stage.

8. The waste pressure and waste heat recovery system according to claim 1, characterized in that: The series sequence power generation device further includes a front end regulating valve connected in series between the high-pressure fluid manifold and the hydraulic turbine power generation device, and a turbine regulating valve connected in series between the hydraulic turbine power generation device and the low-pressure fluid manifold, wherein: The front-end regulating valve is used to regulate the flow of the secondary circuit medium entering the series sequence power generation device, and the turbine regulating valve is used to regulate the flow resistance of the hydraulic turbine power generation device to ensure the required pressure of the low-pressure fluid manifold.

9. The waste pressure and waste heat recovery system according to claim 8, characterized in that: The waste pressure and waste heat recovery system can be formed by a plurality of series-connected power generation devices to form a parallel sequence, wherein: When the operating flow rate of the hydraulic turbine power generation device is less than a first threshold value and greater than or equal to a second threshold value, the flow rate is balanced by controlling the opening of the front-end regulating valve of each series-series power generation device, and the resistance of the hydraulic turbine device is reduced by controlling the opening of the turbine regulating valve; When the working flow of the hydraulic turbine power generation device is less than the second threshold value, some of the front-end regulating valves are closed, and the flow of the remaining columns of the series sequence power generation devices is balanced by controlling the opening of the remaining front-end regulating valves.

10. The waste pressure and waste heat recovery system according to claim 9, characterized in that: The first threshold is 80% of the rated flow of a single hydraulic turbine power generation device, and the second threshold is 60% of the rated flow.

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