100results about "Steam central heating" patented technology

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 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 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.

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.

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 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 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 invention discloses a double-reduction arrangement system for wide-area load adjustment of a heat supply pipe network and a using method of the double-reduction arrangement system. The double-reduction arrangement system comprises a high-pressure steam extraction module used for leading out high-pressure steam from reheating hot section outlets of two units respectively; the large-flow temperature and pressure reduction module is connected to the downstream of the high-pressure steam extraction module and used for reducing the high-pressure steam to low-pressure heat supply parameters; the bypass temperature and pressure reduction module and the large-flow temperature and pressure reduction module are connected to the downstream of the high-pressure steam extraction module in parallel, and the bypass temperature and pressure reduction module is used for providing small-flow stable heat supply under the low-load working condition; the large-flow channel and the bypass small-flow channel are connected to the downstream of the same high-pressure steam extraction module in parallel, continuous load adjustment is achieved, the problems of oscillation, scouring and overtemperature of the opening degree of a traditional single valve in a low-load area are solved, and the coverage of the large-flow channel is 50-300 t / h; the bypass small-flow channel covers 5-50 t / h, and the bypass small-flow channel and the bypass small-flow channel are connected in parallel and converged into the same heat supply header, so that a rated load continuous adjustable interval is formed, and the problem of night tilt is solved; and the problems of single valve oscillation, overtemperature and forced supply stop in the time period of 10 t / h are solved.

The invention relates to the technical field of waste heat recovery, in particular to a chemical waste heat gradient utilization system. A chemical waste heat gradient utilization system comprises a waste heat circulation unit used for treating multi-stage waste heat, and the multi-stage waste heat comprises a first-stage waste heat circulation at the temperature of 59.4 / 40 DEG C, a second-stage waste heat circulation at the temperature of 50 / 35 DEG C, a third-stage waste heat circulation at the temperature of 50 / 42 DEG C, a fourth-stage waste heat circulation at the temperature of 40 / 32 DEG C and a fifth-stage waste heat circulation at the temperature of 80 / 35 DEG C; the cooling circulation unit is used for carrying out heat exchange on cooling water at 32 DEG C and the waste heat circulation unit and raising the temperature to 40 DEG C; the steam-condensate unit is used for cooling and depressurizing steam and seasonal distribution of 90-DEG C condensate; the heat utilization end heating unit is used for heating municipal heating, process hot water and heat tracing; and the control unit is used for dynamically adjusting the temperature and the flow of each unit. According to the chemical waste heat gradient utilization system, efficient utilization of waste heat resources is achieved, multiple heat utilization requirements are met, stable operation of the system is achieved, and energy consumption and operation cost are reduced.

The present invention relates to a peak-shaving system and method for high-temperature molten salt heat storage coupled gas-fired cogeneration, comprising a gas turbine generator set, a molten salt waste heat boiler, a molten salt heat storage device, a molten salt steam heat exchange mechanism, a steam turbine generator set and a circulating water supply pipeline, wherein the flue gas outlet of the gas turbine generator set is connected to the flue gas inlet of the molten salt waste heat boiler; the molten salt heat storage device comprises a low-temperature molten salt storage tank, a low-temperature molten salt pump, a low-temperature heater, a high-temperature heater, a high-temperature molten salt storage tank and a high-temperature molten salt pump which are connected in sequence; the molten salt steam heat exchange mechanism comprises a high-pressure superheater, a high-pressure steam drum, a medium-pressure superheater and a medium-pressure steam drum; the medium-pressure steam outlet of the medium-pressure superheater is connected to the medium and low-pressure steam inlets of the steam turbine generator set via a medium-pressure superheated steam main pipe, and the medium-pressure superheated steam main pipe is connected to industrial steam users; this system can not only regulate peak power to meet the needs of the power grid, but also greatly reduce the irreversible loss of high-temperature molten salt thermal energy and generate steam with corresponding parameters to meet the needs of residential users.

The embodiment of the invention provides a cooling and heat supply system for superheated steam and a control method of the cooling and heat supply system. The cooling and heat supply system comprises a heat source, a heat supply network heater, a cooling assembly, a detection assembly and a controller. The heat source is used for providing superheated steam. The heating network heater communicates with a heat source through a steam pipeline. And the cooling assembly is arranged between the heat source and the heating network heater, is used for cooling the superheated steam and comprises a control valve. The detection assembly is arranged between the cooling assembly and the heating network heater and used for detecting working parameters of the steam pipeline. The controller is connected with the detection assembly and the control valve, and the controller controls the operation parameters of the cooling assembly according to the working parameters so as to cool the superheated steam to saturated steam or slightly superheated steam.

The present application relates to the technical field of municipal heating, and particularly relates to a multi-system coupled molten salt heat storage system for municipal heating, which comprises a molten salt storage unit provided with nitrogen sealing pressure adjustment, a molten salt circulating and conveying unit in communication with the molten salt storage unit and used for realizing stable circulation of the molten salt, a molten salt and water heat exchange system which sequentially completes preheating, evaporation and superheating heat exchange along the molten salt flow direction and is provided with a steam-water separation structure, and an anti-condensation guarantee system respectively acting on the molten salt storage and conveying side and the heat exchange side, and a control system is used for uniformly and coordinately controlling the temperature, pressure and flow state of the molten salt in the storage, circulating conveying and heat exchange processes, so as to guarantee safe, continuous and efficient operation of the system. In the present application, the molten salt heat storage, steam-water heat exchange, anti-condensation guarantee and control system are coupled, and the control system is used for uniformly and coordinately controlling the operation state of the molten salt in the storage, conveying and heat exchange processes, so as to solve the problem of independent configuration and insufficient coordination of the traditional municipal heating system.

The invention relates to a medium-pressure heat supply system of a waste heat boiler, and belongs to the technical field of boiler equipment. The system comprises a medium-pressure heat supply steam pipeline, a cold reheating steam pipeline, a high-pressure main steam pipeline and a pressure matcher, an inlet of the medium-pressure heat supply steam pipeline is connected with an outlet of the pressure matcher, an outlet of the cold reheating steam pipeline is connected with a low-pressure steam inlet of the pressure matcher, and an outlet of the high-pressure main steam pipeline is connected with a high-pressure steam inlet of the pressure matcher. The cold reheated steam enters the medium-pressure heat supply steam pipeline after being diffused in the pressure matcher with the high-pressure main steam as a power source, and an outlet of the medium-pressure heat supply steam pipeline is connected with a medium-pressure heat supply user. In the invention, the cold resteam is boosted by means of the pressure distributor and the high-pressure main steam and is used for medium-pressure heat supply, and the system has the beneficial effects of less high-pressure extracted steam, higher steam turbine output and lower combined cycle heat consumption.

The application discloses a full-electricity-driven steam turbine exhaust heat supply system and method. The system comprises: a steam source extraction unit, the inlet of which is connected to the high-pressure cylinder exhaust pipeline of a steam turbine for steam extraction; an electric steam compressor unit, the inlet of which is connected to the outlet of the steam source extraction unit for steam pressure lifting to a target heat supply pressure; an electric heating temperature rising unit, the inlet of which is connected to the outlet of the electric steam compressor unit for steam temperature heating to a target heat supply temperature; an integrated control unit connected to the electric steam compressor unit and the electric heating temperature rising unit for coordinated control of the pressure and temperature of the steam; and a power supply adjusting unit connected to the electric steam compressor unit and the electric heating temperature rising unit for power supply and power distribution optimization. The application can realize full-electricity-driven steam supply and modularity, and completely decouples the rigid coupling between the heat supply system and the heat cycle of the power generation host.

The present application relates to a kind of nuclear energy cogeneration heat supply system, comprising: at least two nuclear energy heat supply device, each nuclear energy heat supply device includes intercommunication steam supply system and start separation system;Steam supply system provides steam, start separation system includes start separator, water removal system, steam interface, steam outlet and water removal interface;Start separator, water removal system intercommunication, steam interface connects steam supply system and start separator, steam outlet connects start separator and water removal system, water removal interface connects water removal system;And distribution system, steam outlet is connected to distribution system and load, water removal interface is connected to distribution system, and distribution system is connected to load, load is connected to steam supply system and water removal system, water removal system is connected to steam supply system.The steam of multiple nuclear energy heat supply device can be after gathering to the external heat supply load again supply, let heat supply be more uniform, and heat supply mode is various.

This utility model discloses a high-efficiency steam heating device, belonging to the field of steam heating technology. It includes an inlet pipe and a drain pipe installed on both sides of a heat dissipation chamber; mounting seats are provided inside the inlet and drain pipes, with an annular rotating groove inside the mounting seats; a rotating mechanism is movably installed between the inlet and drain pipes, with limiting protrusions on both sides of the rotating mechanism that cooperate with the rotating groove; multiple sets of slots are formed on the inner wall of the limiting protrusions, with positioning springs connected within the slots, and ball bearings at the outer ends of the positioning springs; grooves are formed on the inner wall of the grooves that cooperate with the ball bearings; the rotating mechanism includes multiple sets of branch pipes. This utility model can fully dissipate heat through the rotating mechanism, and the cooperation of the ball bearings and grooves allows the rotating mechanism to be rotated according to needs, thereby cooperating with a drying rack to dry clothes, thus making full use of heat energy. This design improves the stability and practicality of this energy-saving steam heating mechanism.

A steam system configured to heat water, the steam system comprising: a heat exchanger configured to receive steam and water, where the heat exchanger is configured to heat water with steam; a steam supply line configured to be connected to a steam source to supply steam to the heat exchanger; a condensate line configured to receive condensate from the condensed steam from the heat exchanger and to convey the condensate away from the heat exchanger; a water supply line configured to supply water to the heat exchanger; a water outlet line configured to receive the heated water from the heat exchanger and to deliver the heated water away from the heat exchanger; a steam valve disposed on the steam supply line and configured to control steam flow through the steam supply line; a condensate valve disposed on the condensate line and configured to control a flow of condensate through the condensate line; a first sensor disposed downstream of the steam valve and upstream of the condensate valve and configured to output a pressure signal indicative of a pressure in the steam system between the steam valve and the condensate valve, and / or a second sensor at the condensate outlet, a condensate temperature sensor configured to output a condensate temperature signal indicative of a temperature of condensate in a condensate line between the heat exchanger and the condensate valve; a third sensor disposed on the water outlet line and configured to output a water temperature signal indicative of a temperature of the hot water passing through the water outlet line; and a controller configured to control opening and closing of the steam valve and the condensate valve based on at least one of the pressure signal and the condensate temperature signal and the water temperature signal.

The invention provides a combined heat and power generation energy gradient utilization heat supply system based on low-pressure cylinder separation. The system comprises an intermediate-pressure cylinder, a first low-pressure cylinder section, a second low-pressure cylinder section, a first heat exchanger, a second heat exchanger, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline. The pipe sides of the first heat exchanger and the second heat exchanger are sequentially connected to a heating return water pipeline in series in the flowing direction of heating return water, an outlet of the medium-pressure cylinder communicates with an inlet of the first section of the low-pressure cylinder through the first pipeline, and an outlet of the medium-pressure cylinder communicates with an inlet of the second section of the low-pressure cylinder through the second pipeline. An outlet of the low-pressure cylinder section 1 is communicated with a shell side inlet of the first heat exchanger through a third pipeline, and an outlet of the medium-pressure cylinder is communicated with a shell side inlet of the second heat exchanger through a fourth pipeline. The system can solve the problems that in the prior art, combined heat and power generation efficiency and flexibility are difficult to consider, low-temperature waste heat utilization is insufficient, and system modification economy is poor.

The utility model discloses a water tank type heat supply device and system, the water tank type heat supply device comprises two phase change material areas, two steam supply / discharge pipes and a group of steam inlet / water inlet pipes, and each phase change material area wraps part of the steam inlet / water inlet pipes and part of pipe bodies of the steam supply / discharge pipes. Therefore, the phase-change material pipe layer is in direct contact with the steam supply / discharge pipe and the steam inlet / water inlet pipe, when the steam inlet / water inlet pipe is used for filling demineralized water, the phase-change material can fully absorb heat of the wall of the steam inlet / water inlet pipe, and compared with the mode that the phase-change material is attached to the wall surface of the tank body to absorb the heat of the demineralized water after being heated in the tank body, the phase-change material can fully absorb the heat of the demineralized water. And the speed of directly absorbing heat on the steam inlet / water inlet pipe wall is higher, so that the steam conveying efficiency is improved.

The invention provides an efficient combined heat and power generation heat supply system adopting low-pressure steam cascade heating. The system comprises an intermediate-pressure cylinder, a low-pressure cylinder section 1, a low-pressure cylinder section 2, a first pipeline, a second pipeline, a condenser, an absorption heat pump and a heat exchanger. In the heating and heat supply stage, part of exhaust steam of the low-pressure cylinder section 1 enters the low-pressure cylinder section 2, so that heat supply network water is sequentially heated by the condenser, the absorption heat pump and the heat exchanger; in the deep peak regulation stage, steam admission of the second section of the low-pressure cylinder is reduced to the lowest steam flow for maintaining safe cooling, so that heat supply network water is sequentially heated by the absorption heat pump and the heat exchanger; and in the rotor replacement stage, steam admission of the second section of the low-pressure cylinder is stopped, so that heat supply network water is sequentially heated by the absorption heat pump and the heat exchanger. The system can solve the problems that in the prior art, combined heat and power generation efficiency and flexibility are difficult to consider, low-temperature waste heat utilization is insufficient, and system modification economy is poor.