Industrial steam supply system based on 600MW-level high-temperature gas cooled reactor unit
By setting up specific equipment and processes in the high-temperature gas-cooled reactor unit, industrial steam is produced using nuclear island steam, which solves the problems of high carbon emissions and high costs of traditional thermal power unit steam supply and realizes an efficient and safe nuclear energy steam supply solution.
Patent Information
- Application Number
- CN202520069880.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Traditional industrial steam supply schemes for thermal power units suffer from high carbon emissions, high heating costs, and low energy utilization rates. Furthermore, nuclear power units experience a decrease in equipment utilization hours due to increased load rates during winter heating seasons.
The unit employs a 600MW high-temperature gas-cooled reactor. It is equipped with equipment such as a demineralized water booster pump, a primary preheater, a high-pressure deaerator, a heating feedwater pump, a secondary preheater, an evaporator, a superheater, a steam turbine, and a nuclear island evaporator. The steam from the nuclear island evaporator outlet is condensed and released heat in the superheater, evaporator, and secondary preheater to produce high-dryness wet steam, which is then supplied for industrial steam supply.
It increased the utilization hours of nuclear power equipment, reduced carbon emissions, improved energy efficiency, and ensured the safety of steam supply by isolating industrial steam from the working fluid in the secondary loop of the nuclear island through surface heat exchange equipment.
Smart Images
Figure CN223895951U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of nuclear energy heating and relates to a system for large-scale industrial steam supply using a 600MW high-temperature gas-cooled reactor unit. Background Technology
[0002] To achieve safer and more economical operation of nuclear power units, most of my country's current nuclear power units operate at full power with base load. However, in Northeast China, as the load rate of thermal power units increases in winter, nuclear power units experience load reduction when electricity demand is limited. To vigorously promote clean heating in my country and accelerate the increase in the proportion of clean heating, exploring the use of nuclear energy for heating is one of the important ways to effectively reduce carbon emissions and achieve clean heating.
[0003] Traditional large-scale industrial steam supply schemes typically utilize steam extracted from thermal power units for external supply, such as... Figure 1 As shown. Steam supply typically involves drawing exhaust steam from the left high-pressure cylinder, which passes through a check valve, pneumatic regulating valve, desuperheater, and shut-off valve before being supplied externally. Its main disadvantages are as follows:
[0004] (1) Using fossil fuels for heating results in large carbon emissions, which contradicts emission reduction policies.
[0005] (2) The increased load rate of heating units in winter leads to a decrease in the utilization hours of nuclear power equipment.
[0006] (3) The heating cost is high and the energy utilization rate is low.
[0007] High-temperature gas-cooled reactors can provide high-parameter steam at 13.9 MPa(a) and 541°C, with high power generation thermal efficiency. Their combined heat and power (CHP) is of great significance for realizing the efficient and multi-purpose utilization of nuclear energy, and plays an important role in ensuring energy security, adjusting the energy structure, and achieving green development. Therefore, researching the use of 600MW-class high-temperature gas-cooled reactor units for large-scale industrial steam supply has become the main goal of clean heating. Utility Model Content
[0008] The purpose of this invention is to provide an industrial steam supply system based on a 600MW high-temperature gas-cooled reactor unit, in order to solve the problems of high carbon emissions, high heating costs, and low energy utilization in traditional thermal power units' industrial steam supply, thereby realizing the use of nuclear energy to produce industrial steam for steam-driven users.
[0009] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0010] An industrial steam supply system based on a 600MW high-temperature gas-cooled reactor unit is characterized by comprising: a demineralized water booster pump, a primary preheater, a high-pressure deaerator, a heating feedwater pump, a secondary preheater, an evaporator, a superheater, a steam turbine, a nuclear island evaporator, and a conventional island condensate pump. The outlet of the nuclear island evaporator is sequentially connected to the pipe side of the superheater, evaporator, secondary preheater, and primary preheater, and then further connected to the pipeline connecting the outlet of the conventional island condensate pump to the inlet of the nuclear island evaporator. The ambient temperature demineralized water booster pump is sequentially connected to the shell side of the primary preheater, high-pressure deaerator, heating feedwater pump, secondary preheater, evaporator, and superheater.
[0011] Furthermore, it also includes a superheater inlet main steam regulating valve installed on the inlet pipe on the superheater tube side, an evaporator feedwater regulating valve installed on the shell side pipes of the evaporator and the secondary preheater, a drain valve installed on the pipe between the tube side of the evaporator and the secondary preheater, and a main steam regulating valve installed on the turbine inlet pipe.
[0012] Furthermore, the primary preheater, secondary preheater, evaporator, and superheater are arranged in a column.
[0013] The heating steam source of this invention is taken from the main steam of the nuclear island evaporator. The steam consumption is based on the industrial steam demand and enters the superheater, while the remaining main steam enters the turbine. The heating steam condenses and releases heat to cool down into subcooled water in the heat exchange equipment, including the primary preheater, secondary preheater, evaporator, and superheater. This subcooled water enters the condensate pipeline at the outlet of the conventional island condensate pump and is then sent to the nuclear island evaporator via the conventional island regenerative system to complete the cycle. Demineralized water is sent to the primary preheater via the demineralized water booster pump, heated to undersaturated water, and then enters the high-pressure deaerator. After deaeration, it enters the secondary preheater as saturated water via the heating feedwater pump. After being heated to the undersaturated temperature, it enters the evaporator to produce high-dryness wet steam. Finally, it is heated to qualified industrial steam by the heat exchanger and then supplied externally.
[0014] Compared with existing solutions, the beneficial effects of this utility model are:
[0015] By simultaneously generating electricity from nuclear power and supplying steam for industrial use, the utilization hours of nuclear power equipment are increased, nuclear energy efficiency is improved, and carbon emissions are reduced. The use of surface heat exchangers ensures the isolation of industrial steam from the secondary loop working fluid in the nuclear island, guaranteeing steam supply safety. This scheme utilizes high-temperature reactor main steam to produce industrial steam, achieving combined heat and power (CHP) for the nuclear power unit and providing a new solution for the comprehensive utilization of nuclear energy. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the existing industrial steam supply scheme for thermal power units;
[0017] Figure 2This is a schematic diagram of the industrial steam supply system based on a 600MW high-temperature gas-cooled reactor unit.
[0018] Wherein: 1-Demineralized water booster pump; 2-First stage preheater; 3-High pressure deaerator; 4-Heating feedwater pump; 5-Second stage preheater; 6-Evaporator; 7-Superheater; 8-Superheater inlet main steam regulating valve; 9-Evaporator feedwater regulating valve; 10-Drain valve; 11-Steam turbine; 12-Steam turbine main steam regulating valve; 13-Nuclear island evaporator; 14-Conventional island condensate pump. Detailed Implementation
[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.
[0020] Reference Figure 2 In this utility model, the superheater 7, evaporator 6, secondary preheater 5, and primary preheater 2 are arranged in a column. The heating water supply pump 4, deaerator 3, primary preheater 2, and heating water supply pump 1 are common equipment, and their quantity and configuration are determined based on the overall consideration of the external heat load.
[0021] The hot-side working fluid flow is as follows: The main steam of the high-temperature gas-cooled reactor first enters the superheater 7 tube side, releases heat and cools down to low superheat steam, then enters the evaporator 6 tube side, condenses and is moderately subcooled in the evaporator and flows out as unsaturated water, and continues to enter the secondary preheater 5 tube side to exchange heat with the cold-side working fluid and cool down before entering the primary preheater 2 tube side, where it exchanges heat with ambient temperature demineralized water and cools down to about 50°C before returning to the unit condensate pump 14 outlet pipe.
[0022] The cold-side working fluid flow is as follows: ambient temperature demineralized water is sent to the shell side of the primary preheater 2 via booster pump 1. After being heated to the undersaturated water level, it enters the high-pressure deaerator 3. After being heated and deaerated, it is pressurized by the heating feed water pump 4 in a saturated state and enters the shell side of the secondary preheater 5. After being heated to the undersaturated temperature, it enters the shell side of the evaporator 6 to generate wet steam. After steam-water separation, the dryness of the produced steam can reach 0.98-0.99. The high dryness wet steam then enters the shell side of the superheater 7, is heated to the qualified industrial steam level, and is then supplied to the outside.
[0023] Depending on the application, different steam parameters are required. This system aims to maintain the parameters of industrial steam, ensuring that the heating steam has sufficient pressure and a certain degree of superheat. Since industrial steam is mainly used to drive devices, considering the changes in the working fluid during heat transfer, a certain heat exchange difference is required between the cold and hot sides. Therefore, this invention uses high-temperature reactor main steam as the heating steam source. The main steam generated from the high-temperature reactor enters the superheater 7 as needed, and the remaining main steam enters the turbine for power generation. The turbine main steam regulating valve 12 maintains a stable main steam pressure, and the turbine generator operates in a "turbine-reactor" mode.
[0024] The heating steam flow rate is regulated to maintain the pressure of the heating steam header. This can be achieved by installing multiple heat exchangers, including a two-stage preheater, evaporator, and superheater. The flow rate is regulated in stages by adjusting the opening of the main steam regulating valve 8 at the superheater inlet, responding to changes in heat load on the hot side. The feedwater regulating valve 9 of the synchronous evaporator maintains the evaporator liquid level, responding to changes in heat load on the cold side. When the main steam regulating valve of the priority section reaches its limit, the equipment in the second section will be designated as the priority section, and the priority will be adjusted accordingly.
[0025] The steam supply temperature regulation aims to maintain the temperature of the steam supply header. This is achieved by adjusting the opening of the superheater inlet heating steam regulating valve 8 to maintain the temperature of each steam supply branch pipe, thereby ensuring the temperature of the steam supply header.
[0026] When the unit is operating at normal power, the main steam pressure control and heat load tracking control are achieved by operating the opening of the turbine main steam regulating valve 12 and adjusting the unit power setpoint.
[0027] The main steam of the high-temperature reactor condenses in the evaporator 6 to form a liquid level. The evaporator condensate level is maintained by adjusting the opening of the drain valve 10 to prevent steam from escaping.
[0028] The saturated steam prepared by the evaporator 6 is used to heat the high-pressure deaerator 3 to heat and deoxygenate the demineralized water.
[0029] The cold end system can be configured with a natural draft cooling tower or a mechanical draft cooling tower circulating cooling water system. The scale of the cold end configuration that is suitable for the unit's heat load can be approximately reduced according to the proportion of the reduction in unit output, and needs to be determined according to the specific conditions of the project.
Claims
1. An industrial steam supply system based on a 600MW high-temperature gas-cooled reactor unit, characterized in that... include: The system includes a demineralized water booster pump, a primary preheater, a high-pressure deaerator, a heating feedwater pump, a secondary preheater, an evaporator, a superheater, a steam turbine, a nuclear island evaporator, and a conventional island condensate pump. The outlet of the nuclear island evaporator is sequentially connected to the pipe side of the superheater, evaporator, secondary preheater, and primary preheater, and then further connected to the pipeline connecting the outlet of the conventional island condensate pump to the inlet of the nuclear island evaporator. The demineralized water booster pump is sequentially connected to the shell side of the primary preheater, high-pressure deaerator, heating feedwater pump, secondary preheater, evaporator, and superheater.
2. The industrial steam supply system based on a 600MW high-temperature gas-cooled reactor unit according to claim 1, characterized in that, It also includes a superheater inlet main steam regulating valve installed on the inlet pipe on the superheater tube side, an evaporator feedwater regulating valve installed on the shell side pipes of the evaporator and the secondary preheater, a drain valve installed on the pipe between the tube side of the evaporator and the secondary preheater, and a main steam regulating valve installed on the turbine inlet pipe.
3. An industrial steam supply system based on a 600MW high-temperature gas-cooled reactor unit according to claim 1, characterized in that, The primary preheater, secondary preheater, evaporator, and superheater are arranged in a column.