190results about "Steam central heating" patented technology

The invention provides an energy storage coupling heat pump heat supply system and a heat supply method. The system comprises a heat pump device, an energy storage device and a control module. The heat pump device heats the heat carrier to a first temperature, and the energy storage device further heats the heat carrier to a second temperature for heat supply. The control module dynamically regulates and controls operation of the heat pump device and the energy storage device according to the heat supply demand quantity and the external heat source state, the heat pump device and the energy storage device are preferentially operated in the off-peak electricity period to complete heat storage, and first enthalpy increment provided by the heat pump device and second enthalpy increment released by the energy storage device are dynamically distributed in the heat supply period. And diversified thermal load requirements are met. The system supports real-time adjustment of power distribution, preheating optimization and waste heat utilization, and has the characteristics of high efficiency, flexibility and energy conservation.

The invention discloses a self-driven boosting steam heat supply system and an on-demand optimization matching method, and belongs to the technical field of industrial steam centralized heat supply and energy conservation. Comprising a steam heat source, a steam turbine, a steam compressor, user areas with different pressure requirements, an electric pressure reducing valve, an electric adjusting valve and a data acquisition control center. The system utilizes a steam turbine and a steam compressor to convert surplus energy of steam in front of a low-pressure user area into power for increasing steam pressure of a high-pressure user area, and gradient utilization of steam energy is achieved. According to the on-demand optimization matching method, user partitions are divided by analyzing user demands, a pipe network model is established by adopting pipe network mechanism modeling or data modeling, an intelligent adjustment algorithm is constructed, and a closed loop is regulated and controlled by means of a data acquisition control center. The problems that a traditional steam heat supply system wastes energy and cannot accurately match user requirements are effectively solved, heat source supply parameters and system energy consumption can be reduced, the energy utilization efficiency is improved, and good economic benefits and social benefits are generated.

The invention discloses a biomass power plant dead steam and flue gas waste heat integrated recovery heat supply device which comprises the following components: a biomass boiler used for combusting biomass fuel and generating high-temperature steam, and a flue gas outlet of the biomass boiler is connected to a flue gas emission reduction and waste heat recovery integrated unit; a steam inlet of the steam turbine is connected with a high-temperature steam outlet of the biomass boiler, and a steam outlet of the steam turbine is connected to a high-temperature side inlet of the steam exhaust heat exchanger and a high-temperature side inlet of the condenser through valves; the steam exhaust heat exchanger is connected with the condenser. When the device is implemented, waste steam latent heat and flue gas sensible heat / latent heat are recovered in a stepped manner, so that the comprehensive heat efficiency is remarkably improved; seasonal mode switching is achieved through an arranged intelligent control system, namely flue gas waste heat is recycled preferentially in summer, and steam exhaust heat supply is combined in winter; fuel cost is counteracted through waste heat sales income, and the income during implementation of the device is increased.

The multi-stage steam extraction heat supply system comprises a steam extraction injection device, a steam circulation device and a supply device, the steam extraction injection device communicates with the steam circulation device, and the steam circulation device communicates with the supply device. The steam extraction injection device comprises multiple stages of steam extraction branches, and the pressures of steam introduced into all the stages of steam extraction branches are different. The injection unit communicates with the multiple stages of steam extraction branches and is used for mixing the steam with different pressures provided by the multiple stages of steam extraction branches and then providing the mixed steam to the steam circulating device; the steam circulating device is used for constructing a steam circulating loop by utilizing the mixed steam; the supply device is used for supplying heat energy generated by the steam circulation loop to the outside. And due to the design of multi-stage steam extraction and injection, the system can flexibly select a steam source according to the external load requirement, rapid response and efficient energy conversion are achieved, the adjusting capacity of the system under the variable load condition is improved, and the energy utilization rate and the adaptability of the system are improved.

The invention discloses an independent unit structure of a high-voltage solid heat accumulator and a thermodynamic cycle system of the independent unit structure. An independent unit is composed of the solid heat accumulator, an electric heating body, a series connection conductive band, a parallel connection conductive band, an insulation foundation, a porcelain insulator, an equipment foundation, an upper heat preservation layer, a connection electrode, a null line electrode and an outer sleeve. Insulation porcelain bottles are uniformly arranged on an equipment foundation in an array mode, an insulation foundation is arranged on the upper portions of the insulation porcelain bottles, a solid heat accumulator is installed on the insulation foundation, and an upper heat preservation layer is arranged on the top of the solid heat accumulator. The two ends of the plurality of electric heating bodies are connected with the parallel conductive bands arranged on the vertical surfaces of the solid heat accumulator to form a parallel group, and the parallel group is connected with the series conductive bands arranged on the two corresponding vertical surfaces of the solid heat accumulator; according to an independent unit structure, the electric heating bodies form an angle connection form or a star connection form through a series connection conductive band and a parallel connection conductive band, and the connecting electrodes are externally connected to an A-phase power supply, a B-phase power supply and a C-phase power supply of the power supply switch through an external sleeve.

A steam power cycle thermoelectric decoupling system includes a molten salt heat storage system, a steam accumulator heat storage system, and a preheating system. The steam accumulator heat storage system is taken as a main heat storage component, which solves low heat storage efficiency and high heat storage costs by simply using molten salt. Saturated steam released by the steam accumulator heat storage system is heated to a superheated state by heat stored in the molten salt heat storage system, achieving supplement of the saturated steam released by the steam accumulator heat storage system to the heat supply network, and the preheating system is utilized for solving the problem that the temperature of steam output from the steam accumulator heat storage system is lower than the solidifying point temperature of the molten salt, causing the solidification of molten salt.

The utility model provides a steam temperature control and pressure regulation conveying device, and relates to the field of conveying devices.The steam temperature control and pressure regulation conveying device comprises a conveying pipeline, the front end and the rear end of the conveying pipeline are each provided with a first connecting flange, the conveying pipeline is provided with a blocking piece, the blocking piece is rotatably installed in the conveying pipeline, and the upper end of the blocking piece is provided with a rotating handle assembly; the front end and the rear end of the conveying pipeline are both provided with a temperature sensor and a pressure sensor, and the pressure sensor and the temperature sensor are both electrically connected with the PLC. During use, a plurality of tree hole pipelines can be connected through the first connecting flange, then the first connecting flange is connected with a steam supply device, and the tail connecting flange is connected with a steam using device; steam is conveyed through the conveying pipeline, the pressure and the temperature in the conveying pipeline can be detected through the pressure sensor and the temperature sensor in the conveying process and sent to the PLC for monitoring, and the conveying area of the conveying pipeline can be adjusted by rotating the blocking piece.

The invention provides a heat supply system and method, and belongs to the technical field of energy recycling. The heat supply system comprises a coal-fired power generation unit and a heat supply pipe network connected with the coal-fired power generation unit, and further comprises a waste incineration unit coupled with the coal-fired power generation unit. The waste incineration unit and the coal-fired power generation unit are both connected with a heat supply initial station of the heat supply pipe network. The waste incineration unit comprises a waste incinerator and a waste heat boiler, the waste incinerator is used for incinerating municipal waste to generate high-temperature flue gas, and the waste heat boiler heats water in the waste heat boiler through the generated high-temperature flue gas to generate high-temperature steam. The coal-fired power generation unit comprises a coal-fired boiler used for generating high-temperature steam; when the coal-fired power generation unit is in a normal operation state, the heat supply initial station of the heat supply pipe network receives high-temperature steam generated by the coal-fired power generation unit, and when the coal-fired power generation unit is in a low-load operation state, the heat supply initial station of the heat supply pipe network receives high-temperature steam generated by the waste incineration unit.

A heating device based on the form of heat supply using a secondary circuit in a nuclear power plant, and a control method therefor. The heating device based on the form of heat supply using a secondary circuit in a nuclear power plant comprises: a device for heat supply using extraction steam from a steam turbine, and multiple stages of heat exchangers, wherein heat supply drained-water end outlets of multiple stages of high-pressure feedwater heaters in the device for heat supply using the extraction steam from the steam turbine are respectively correspondingly connected to hot-side medium inlets of the multiple stages of heat exchangers on a one-to-one basis; hot-side medium outlets of the multiple stages of heat exchangers are all connected to drained-water end inlets of low-pressure feedwater heaters in the device for heat supply using the extraction steam from the steam turbine; and cold-side medium inlets and cold-side medium outlets of the multiple stages of heat exchangers are all connected to a heat supply network in series. While heating is achieved, the cost for transforming a secondary circuit pipe and the impact on a working medium in a main steam pipe are reduced.

The system comprises a power generation system and a heat supply system, the power generation system comprises a boiler, a carbon dioxide turbine, a heat regenerator, a precooler, a compressor and a motor generator, an outlet of the boiler is connected with an inlet of the turbine, an outlet of the turbine is connected with a hot side inlet of the heat regenerator, and an outlet of the compressor is connected with a hot side inlet of the precooler. An outlet of the precooler is connected with an inlet of the compressor, an outlet of the compressor is connected with a cold-side inlet of the heat regenerator, a cold-side outlet of the heat regenerator is connected with an inlet of the boiler, and the compressor and the turbine are respectively connected with the motor generator. The heat supply requirement can be met, complete thermoelectric decoupling is achieved, and the flexibility of the supercritical carbon dioxide cycle generator set is fully exerted while stable heat supply is achieved.

An air source heat pump and steam boiler combined heat supply system comprises a water treatment system, an air source heat pump, a deaerator, a steam boiler and an induced draft fan, the water treatment system used for desalting and softening water is connected with the water inlet end of the air source heat pump, and the water outlet end of the air source heat pump is connected with the water inlet end of the steam boiler through the deaerator. The air outlet end of the steam boiler is connected with the air inlet end of the air source heat pump. The heat supply system is simple in structure, convenient to operate, flexible and practical, the air source heat pump is embedded in an existing mature steam boiler heat supply system, the waste heat of the smoke at the tail of the steam boiler is further recycled, the overall heat efficiency of the heat supply system is improved, and the heat supply cost is reduced.

The embodiment of the invention provides a wide-load multi-stage steam supply system and an operation method thereof. The wide-load multi-stage steam supply system comprises a steam turbine power generation assembly and a heat supply assembly. The steam turbine power generation assembly comprises a main steam pipeline, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder and a power generator. The heat supply assembly comprises a reheat steam pipeline, a steam supply mother pipeline, a steam supplementing pipeline, a medium-pressure cylinder steam exhaust pipeline and a heat supply network heater. The steam supply mother pipeline is connected with a reheat steam pipeline and an industrial steam supply device; a steam exhaust pipeline of the medium-pressure cylinder is respectively connected with a medium-low pressure communicating pipe and a heating network heater, and the heating network heater is connected with a resident heating device; the steam supplementing pipeline is respectively connected with the steam supply mother pipeline and the heat supply network heater; the steam supplementing pipeline conveys industrial supplied steam of the steam supplying main pipeline to the heat supply network heater for steam supplementing when the unit operates at low load. And meanwhile, the power grid peak regulation requirement and the heat consumer requirement are met, the resident heating and industrial steam supply requirements are considered while the unit peak regulation capacity is not affected in the heating season, and the thermal power unit peak regulation capacity can be released to the maximum extent.

The utility model belongs to the technical field of heat supply, and particularly provides a heat supply steam quantity control device and a heat supply system, which comprise a control module, a pressure reducing valve, a steam inlet electric valve and a first pressure sensor, the control module is configured to switch the working mode of the pressure reducing valve to a first adjusting mode when the received first pressure information is smaller than first preset pressure; when the received first pressure information is larger than second preset pressure, the working mode of the pressure reducing valve is switched to a third adjusting mode; and when the received first pressure information is larger than the first preset pressure and smaller than the second preset pressure, the working mode of the pressure reducing valve is switched to the second adjusting mode. By optimizing and adjusting control over the pressure reducing valve, when the steam inlet electric valve of the equipment to be supplied with steam is opened and the first pressure information is low, the pressure reducing valve is controlled to work in the first adjusting mode, so that the pressure reducing valve is slowly opened, large fluctuation of the load of the boiler 6 is avoided, and stable operation of combustion automatic control is maintained.

The invention relates to a long-distance steam conveying heat supply system which comprises a long-distance steam conveying pipeline, a power parameter adaptation station and a plurality of tail end steam pipelines, and the long-distance steam conveying pipeline is used for conveying high-pressure steam in a steam heat source plant to the power parameter adaptation station; the power parameter adaptation station is used for adjusting the high-pressure steam conveyed by the long-distance steam conveying pipeline into steam of different pressure grades according to the steam using requirements of users in the area; and the tail end steam pipelines are respectively used for conveying the steam of the corresponding pressure grade to the corresponding users in the area. According to the long-distance steam heat supply system, the comprehensive construction investment of a project is low under the condition that the steam using requirements of different user parameters in a load area are met.

A method of integrating steam systems of first and second chemical plants, which includes transferring steam from at least one lower pressure steam header of a first steam production and transport system in the first plant to at least one lower pressure steam header of a second steam production and transport system in the second plant, such that steam produced by the first steam production and transport system is transferred to the second steam production and transport system in the second plant, which can reduce the GHG emissions of the combined first and second plants.

The utility model discloses a pressure relief protection device of a steam heat supply system, which relates to the technical field of pressure relief protection devices and comprises a steam safety valve, one end of the steam safety valve is connected with a guide pipe, and the other end of the guide pipe is connected with a collecting box. The surface of the guide pipe is connected with a first semicircular pipe and a second semicircular pipe, and a pressure sensor is installed at the top end of the first semicircular pipe. The bottom end of the first semicircular pipe is connected with a clamping block. According to the utility model, the conduit can be wrapped by the first semicircular pipe and the second semicircular pipe which are arranged on the surface of the conduit, and meanwhile, whether the conduit leaks or not can be monitored by the pressure sensor arranged on the first semicircular pipe, so that the damage to the surrounding environment or personnel caused by leakage due to long-time use of the conduit is avoided; and meanwhile, steam can be condensed into water and collected through steam condensing equipment arranged in the collecting box, so that the influence of the steam on the surrounding environment is reduced.

The present invention discloses a method for diagnosing and analyzing the mass pipe loss of a steam heating pipe network. The method is as follows: First, analyze the steam transmission and distribution process in the pipe network and establish a physical model; then, based on the mass conservation and energy conservation, establish the steam transmission process equation; next, simplify and solve the steam transmission process equation to obtain the calculation formula for the mass pipe loss of the steam heating pipe network; finally, analyze the composition of the losses during the steam transmission process in the pipe network according to the calculation results. According to the analysis results, the composition of the losses during the steam transmission process in the pipe network can be diagnosed, analyzed and evaluated, thereby providing a basis for implementing targeted loss reduction measures. At the same time, a method for monitoring the pipe network leakage is provided, which is beneficial for the heat network operators to discover and handle in time when an accidental pipe network LOCA occurs in extreme cases, thereby improving the safe operation level of the pipe network.

The present invention discloses a system for reducing the water content of heating steam by flash evaporation, comprising a cogeneration unit, a steam supply main pipeline, a steam supply branch pipeline and a flash evaporation device; the outlet of the cogeneration unit is connected to the steam supply main pipeline, the steam supply main pipeline is provided with a branch port, the branch port is connected to the steam supply branch pipeline inlet, the steam supply branch pipeline outlet is connected to the steam inlet of the flash evaporation device, and the steam outlet of the flash evaporation device is connected to the user. By passing high-pressure saturated steam with water into the flash evaporation device, flash evaporation is performed to supply steam with a lower pressure that meets the pressure requirements of the user, thereby reducing the water content of the steam, increasing the steam heat supply, and achieving energy saving and consumption reduction.

The invention discloses a dead steam waste heat utilization system based on steam compression and an operation method, the dead steam waste heat utilization system is used for recycling waste heat of a waste heat pipeline, the system comprises a control module, and further comprises a softened water supply module, a heat exchange module, a steam compression module and a user output module which communicate in sequence. The number of the waste heat pipelines can be one or more, and the multiple waste heat pipelines are connected in parallel. Each waste heat pipeline can be communicated with one heat exchange module to form a single-stage heat exchange mode; and each waste heat pipeline can also be communicated with a plurality of heat exchange modules in series to form a multi-stage heat exchange mode. The operation mode of the system adopts an automatic control mode to realize automatic start and stop, and automatic adjustment of steam parameters is realized. The scheme has the beneficial effects that waste heat utilization of waste steam heat is realized, the steam recovery efficiency is improved, the utilization cost is reduced, flexible matching design can be realized according to the quality and quantity of waste heat resources, and the scheme has better economical efficiency and popularization value.

The invention relates to the field of heating devices, and discloses a water purifier polymerization reaction heating device and a production process, including a heating device body for heating a mixed liquid, wherein the heating device body includes a heating tank body, a steam heating generator, a high-temperature cleaning device and an arched heat circulation plate body. In the invention, the high-temperature gas flow in the heating tank body can be guided and received by a connecting pipe 2, and discharged outwardly through a heating channel to form a high-speed gas flow effect. In this process, water in a water tank is drawn by a pump 1 to flow along a connecting pipe 4, and the high-temperature gas in the heating channel is used to heat and preheat the water in the connecting pipe 4, and the temperature of the connecting pipe 4 is reduced by the water in the water tank to achieve a temperature difference, thereby further accelerating the flow of the high-temperature gas in the connecting pipe 2, increasing the gas flow speed in the heating tank body, and balancing the temperature in the heating tank body by accelerating the gas flow speed.

This invention pertains to a thermal standby device for a superheated steam desuperheating and depressurization system, within the technical field of superheated steam desuperheating and depressurization systems. The equipment pipeline (23) is sequentially configured from one end connected to the high-pressure main steam input pipeline (24) to the other end of the heating pipe, including a high-pressure steam inlet isolation electric valve, a high-pressure steam depressurization regulating valve (3), a high-temperature high-pressure desuperheating and depressurization device (6), a medium-pressure steam depressurization regulating valve (8), a medium-temperature medium-pressure desuperheating and depressurization device (10), a heating pipe isolation electric valve, and the heating pipe itself. The thermal standby device for a superheated steam desuperheating and depressurization system described in this invention has a simple structure, ensures it remains in thermal standby mode, reduces the time required for emergency deployment, and minimizes energy loss while maintaining thermal standby, thus meeting heating demands.

The application provides a novel steam pipeline temperature and pressure increasing system, which meets the steam parameter requirements of each user in a district and realizes precise steam supply without increasing the temperature and pressure parameters of the steam supply pipeline outlet of a heat source point as a whole. The system comprises a steam supply pipeline; temperature and pressure increasing assemblies are arranged along the steam supply pipeline; the pipeline of each temperature and pressure increasing assembly comprises a steam bypass pipeline, a steam pressure reducing pipe and a steam mixed supply pipe which are arranged along the steam supply pipeline in sequence; a length direction interval is left between the steam bypass pipeline and the steam pressure reducing pipe and between the steam pressure reducing pipe and the steam mixed supply pipe; each temperature and pressure increasing assembly further comprises a heat exchanger, a steam collecting tank, a steam storage tank, a piston and a boiler.

The invention relates to the technical field of helium turbine coupling nuclear energy gradient utilization, in particular to a helium turbine coupling nuclear energy gradient utilization high-temperature gas cooled reactor arrangement method, which comprises a first loop, a second loop, a third loop and a fourth loop, a first medium is arranged in the first loop, and the first loop can heat the first medium; a second medium flows in the second loop; when the heated first medium flows in the first loop, the first medium can be used for generating electricity and transferring heat to a second medium in the second loop; after being heated by the first loop, the second medium can provide heat for the multi-stage user side; through the arrangement of the first loop and the second loop, nuclear energy comprehensive utilization is carried out, the high-temperature gas cooled reactor is coupled with the helium turbine to generate power, and the helium of the high-temperature gas cooled reactor circularly heats the medium of the second loop to realize nuclear energy gradient utilization, so that the coupling problem of the helium turbine and nuclear energy comprehensive utilization is solved, and energy gradient utilization is realized; the use scene of the high-temperature gas cooled reactor is enriched, and the heat efficiency of heat energy transfer and utilization is improved.

The utility model discloses a saturated water tank type heat supply system which comprises a phase change material area, a steam supply / discharge pipe and a heat storage tank storing high-temperature saturated water, the phase change material area comprises a phase change material, and the phase change material is located above the heat storage tank and wraps the steam supply / discharge pipe. Therefore, when the heat supply system releases steam to the user side through the steam supply / discharge pipe, the phase change material can supplement heat to the steam supply / discharge pipe so as to slow down the steam pressure change speed and the temperature change speed in the steam supply / discharge pipe, so that the output steam pressure and temperature change are smooth, the flash evaporation phenomenon caused by sudden pressure drop and the generation of condensed water are reduced, and the heat supply efficiency is improved. And the steam quality and yield are improved.

The invention relates to the technical field of automation control, in particular to a control method, device, equipment and medium of a steam regenerative coupling heat supply system.The method comprises the steps that a first target pressure value of a heat supply main pipe and a second target pressure value of a steam main pipe are obtained; the first target pressure value and a first feedback pressure value of the heat supply mother pipe are input into a first controller, and the first controller outputs a first control quantity based on a corresponding target parameter; the first control quantity, the second target pressure value and a second feedback pressure value of the steam main pipe are input into a second controller, and the second controller outputs a second control quantity based on a corresponding target parameter; and controlling the steam pressure regulating valve according to the second control quantity. According to the method, cooperative stabilization of the pressure of the steam mother pipe and the heat supply mother pipe can be achieved, mutual influence of the pressure of the steam side and the heat supply side in the steam regenerative coupling system is avoided, and safe and stable operation of the induced draft fan is guaranteed.

The invention relates to the technical field of nuclear power, in particular to a heating system and a thermal load detection method of the heating system. The heating system comprises a circulation loop, a heat exchange loop and a detection loop, and the circulation loop is filled with a gaseous medium; the heat exchange loop comprises a heat exchanger, the heat exchanger is arranged on the downstream side of the circulation loop, the gaseous medium is configured to flow from the circulation loop to the heat exchange loop so that heat exchange of the gaseous medium can be achieved at the heat exchanger, and the gaseous medium is condensed into a liquid medium after heat exchange; the detection loop comprises a detection element, and the detection element is arranged on the downstream side of the heat exchanger and used for detecting the flow of the liquid medium. The detection method is used for detecting the heat load of the heating system. The detection method is accurate in detection of the thermal load of the heating system.

The utility model discloses an intelligent drainage system, which relates to the technical field of steam heating equipment and comprises a steam distribution cylinder, a connecting pipe and a steam pipeline are arranged on the outer side of the steam distribution cylinder, and a drainage valve, a bypass pipe and a temperature sensor are arranged at the upper end of the steam pipeline. An electric valve and a cleaning assembly are arranged at the upper end of the bypass pipe; according to the intelligent drainage system, a cleaning assembly is installed in the middle of a bypass pipe, when an electric valve is opened, the bypass pipe is conducted, steam flows into an inner cavity of an impact box, airflow drives a spiral blade to rotate, and under the supporting effect of a fixing rod, the spiral blade drives a connecting shaft to rotate along the interior of a connecting base; and the connecting shaft drives the supporting rod and the cleaning plate to rotate along the inner cavity, the cleaning plate conducts scale cleaning on the inner cavity, the end of the bypass pipe is kept clean, the bypass pipe is prevented from being blocked by scale, and the water draining efficiency is improved.

The invention discloses a multi-scene heat supply and thermoelectric decoupling system of an electrode steam boiler and a spherical tank and an operation method, belongs to the field of energy supply and conversion, and relates to the crossing field of heat energy storage, combined heat and power generation and power system flexibility adjustment technologies. The system achieves coupling of the electrode steam boiler and the spherical tank and deep fusion of the electrode steam boiler and the combined heat and power generation unit through cooperation of a water supply module, a steam preparation, storage and supply module and a heat supply network water heating module, a unit base load main supply and system dynamic supplementing and adjusting mode is formed, steam is efficiently prepared, stored and supplied, and industrial steam and livelihood heating are flexibly supplied. The problems that in the prior art, the heat storage cost is high, industrial heat consumption and livelihood heat consumption cannot be considered, heat supply under extreme working conditions is insufficient, the thermoelectric decoupling and peak regulation capacity is weak, and new energy consumption is poor can be solved, the heat supply capacity and reliability are improved, the thermoelectric decoupling and unit peak regulation capacity and operation stability (including flue gas emission compliance) are enhanced, the energy efficiency is improved, and the energy utilization rate is increased. New energy consumption is assisted, policy requirements are met, and remarkable economic and social benefits are achieved.

The present invention discloses a steam heating system for preventing leakage of secondary medium of nuclear power, including a secondary medium loop, a high-pressure circulating water loop and a low-pressure medium loop. Heat is transferred between the secondary medium and the high-pressure circulating water, and between the high-pressure circulating water and the low-pressure medium through a heat exchanger. When the system is running, the pressure of the high-pressure circulating water loop is kept higher than the pressure of the secondary medium loop, and the pressure of the low-pressure medium loop is kept lower than the pressure of the secondary medium loop. The present invention establishes a high-pressure circulating water loop between the secondary medium loop and the low-pressure medium loop, and makes the pressure of the high-pressure circulating water loop higher than that of the secondary medium loop regardless of normal operation, start-stop or accident state, thereby effectively preventing leakage of secondary medium, ensuring the safety of low-pressure medium for external heat supply, and making it possible to use nuclear energy for external heat supply. The invention also provides similar solutions for other energy utilization systems that need to prevent leakage of media.