54results about How to "Increase the temperature difference between supply and return water" patented technology

The invention relates to a gas-steam circulation heating-electricity-cooling combined supply system and a gas-steam circulation heating-electricity-cooling combined supply method for a thermal power plant with zero energy loss rate and belongs to the technical field of gas-steam combined circulation heating-electricity-cooling combined supply. The gas-steam circulation heating-electricity-coolingcombined supply system comprises a heat-electricity combined circulation part, a large temperature difference adsorption waste steam recovery heat pump, a large temperature difference adsorption fluegas recovery heat pump, a flue gas condensation recovery acquisition device, an initial station steam-water heat exchanger, an adsorption heat pump/refrigeration all-in-one machine and the like, wherein the heat-electricity combined circulation part consists of a burning machine, a waste heat boiler, a steam turbine, a generator and the like. An operation regulating method for carrying out combination energy optimization on an integral thermal system, which is based on an adsorption heat-exchange waste heat recovery and large temperature difference heat supply technology and combines a climate compensation technology, is adopted, so that aiming at the characteristics of a gas-steam combined circulation system, the effect that the energy utilization efficiency for once of the thermal powerplant is close to, even exceeds 100 percent is realized. In the invention, energy resources at each energy grade are utilized to drive generating equipment, heating equipment and air-conditioning cold supply equipment, so that the energy-saving effect that compared with a flue gas low heating value, the effective energy output has no energy loss is achieved.

The invention discloses a water flow regulating valve and particularly discloses a dynamic return water temperature flow regulating valve in a heating, ventilating and air conditioning water system. The dynamic return water temperature flow regulating valve is used for controlling the water flow of a heat-transferring coil and comprises the water flow regulating valve, a driver, a return water temperature sensor, an indoor temperature sensor, an indoor switch and a controller. The return water temperature sensor and the indoor temperature sensor are added, and an indoor temperature set value and a control return difference are preset inside the controller, so that the defect that water flow regulating valves in existing heating, ventilating and air conditioning water systems can not determine reasonable return water temperature set values to regulate the water flow according to indoor temperatures and indoor temperature set values is overcome, the water flow is reduced to the maximum extent, the water pump energy consumption is saved and the main machine refrigeration efficiency is improved when the conditions of indoor cold, hot and humid loads are met, and meanwhile, the cold or heat energy waste caused by the improper installation and usage of the indoor temperature controller can be avoided.

The invention discloses a heat exchange unit and method for integrating an absorption heat pump and an electric heat pump. The heat exchange unit is composed of an absorption heat pump unit, a water-water heat exchanger, an electric heat pump unit and various connecting pipelines and accessories. A waterway system of the connecting pipelines comprises primary side pipelines and secondary side pipelines, the primary side pipelines are sequentially connected in series, and hot water of the primary side pipelines sequentially passes through a generator of the absorption heat pump, the water-water heat exchanger, an evaporator of the absorption heat pump and an evaporator of the electric heat pump. Hot water of the secondary side pipelines can pass through a condenser of the electric heat pump, an absorber and a condenser of the absorption heat pump and the water-water heat exchanger in various manners. Heat of the hot water can be utilized in a gradient manner, and therefore the temperature difference between supplied water and return water of primary side hot water is greatly increased, and the heat supply capacity of a pipe network is improved. Due to the fact that the output water temperature of the primary side outlet heat exchange unit is lower than secondary side input water temperature, the low primary network return water temperature can be used for recycling low-grade waste heat of a heat source.

The invention discloses a thermoelectric supercooling cross-critical CO2 heat pump combined heating system. An outlet of an evaporator is connected with an inlet of a compressor; an outlet of the compressor is connected with an inlet of the working medium side of a gas cooler; an outlet of the working medium side of the gas cooler is connected with an inlet of the cold end of a thermoelectric supercooling device; an outlet of the cold end of the thermoelectric supercooling device is connected with an inlet of a throttling valve; an outlet of the throttling valve is connected with an inlet of the evaporator; a heating water return outlet is connected with an inlet of the thermal end of the thermoelectric supercooling device; an outlet of the thermal end of the thermoelectric supercooling device is connected with an inlet of the heat exchange fluid side of the gas cooler; an outlet of the heat exchange fluid side of the gas cooler is connected with an inlet of a mixing tank; and an outlet of the mixing tank is connected with a heating water return inlet. According to the system, the throttling loss is reduced to a greater extent, the high pressure of CO2 operation is further reduced,the overall system efficiency of a CO2 heat pump is improved, the compression ratio of the compressor is reduced, the isentropic efficiency is improved, and the service life of the compressor is prolonged.

The invention discloses a novel jet-type heat exchanger unit belonging to the technical field of energy sources. The unit mainly consists of a jet-type heat pump, a water-water heat exchanger and a waterway system, wherein the jet-type heat pump consists of a generator, a condenser, an evaporator, an injector, a working medium circulating pump, a heat regenerator, a liquid storage tank, a throttling device and a connecting pipeline; the waterway system of the jet-type heat exchanger unit is divided into a primary side pipeline and a secondary side pipeline. By means of a jet-type refrigeration technology, the heat of hot water of the primary side pipeline is utilized in a cascade manner, the temperature of return water of the primary side pipeline is reduced greatly, the temperature difference between supply water and return water of the primary side pipeline is increased, the heat transmission capacity of the primary side pipeline is improved by a large margin, and the heat transfer capacity of hot water in the primary side pipeline and the secondary side pipeline is improved greatly. The novel jet-type heat exchanger unit provided by the invention can be used for recovering industrial exhaust heat, solar energy and the like, and is also applicable to the substations of a central heating system so as to improve the delivery capacity of a primary heat supply network pipeline.

The invention discloses a centralized heat supply system and method. The centralized heat supply system comprises one or more heat source heat-exchange systems, one or more absorption heat-exchange systems and one or more compression heat-exchange systems. The centralized heat supply method comprises the steps of heat exchange between a heat source heat-supply medium and primary network water, circulation of the primary network water, heat exchange between the primary network water and secondary network water, circulation of the secondary network water, heat exchange between the secondary network water and tertiary network water, water supply and return of a tertiary network and the like. According to the centralized heat supply system and method, compared with an existing large-temperature-difference centralized heat supply mode, the heat supply capacity of a secondary network water supply pipelines is kept under the precise of not increasing the supplied water temperature and pressure of an old heat supply pipe network in an urban district and not affecting the heat delivery capacity of the heat supply network in the urban district, and thus the transformation cost of the existing pipeline network is saved.

The invention discloses a large temperature difference centralized heating system using power plant waste heat and a work method. A two-stage water-water heat exchanger and a two-stage power drive heat pump unit are arranged in a two-stage net heat exchange station, a circular cooling water waste heat recycling heat exchanger, a circular cooling water waste heat recycling electric heat pump unit,steam-water heat exchanger and a water-water heat exchanger are arranged in a first-stage pipe network heat exchange station, on the premise of ensuring the secondary network normal water supply temperature, water supply temperature of a primary heat network can be greatly reduced, steam consumption of a heat supply system is greatly reduced, and the use proportion of thermal power plant circularwater waste heat is greatly improved. Meanwhile, it is ensured that a secondary pipe network has the normal water supply temperature and water supply and returning temperature difference, the water supply temperature of the primary heat network is reduced to 80 DEG C, the water supply temperature of a secondary pipe network reaches about 70 DEG C, and the normal running flow of the secondary pipenetwork and energy-saving running of the circular water pump are ensured.

The invention discloses a heating system with great temperature difference and low temperature radiation. The heating system comprises a first plate-type heat exchanger, a second plate-type heat exchanger, a capillary radiation tail end system and a heat pump unit; the high temperature end of the first plate-type heat exchanger is connected with a heating steam extraction turbine of a thermal power plant; the lower temperature end water outlet of the first plate-type heat exchanger is connected with the high temperature end water inlet of the second plate-type heat exchanger through a water inlet pipe; the low temperature end water outlet of the second plate-type heat exchanger is connected with a water supply pipe of the capillary radiation tail end system; the low temperature end water return opening of the second plate-type heat exchanger is connected with a water return pipe of the capillary radiation tail end system; the high temperature end water outlet of the second plate-type heat exchanger is connected with the water inlet of the heat pump unit through a first water return pipe; the water outlet of the heat pump unit is connected with the low temperature end water inlet of the first plate-type heat exchanger through a second water return pipe; and water pumps are respectively arranged on the water inlet pipe, the first water return pipe and the second water return pipe. The heating system with great temperature difference and low temperature radiation provided by the invention has the advantages that the temperature difference between supplied water and return water is great, the heat energy utilization ratio of circulating water is high, the pipe network flow rate is reduced under the condition of invariant heat supply area, and the electricity consumption is reduced.

The invention discloses a steam extraction power generation and heat supply system of coupling steam extraction and condensing backpressure heat supply and an operation method. The system comprises asteam turbine medium pressure cylinder, a steam turbine low pressure cylinder, a steam condenser, a radial turbo, a cooling device, a steam-water heat exchanger, a first water drain heat exchanger, afirst station heating network heater, a second water drain heat exchanger, a generator and various steam and water pipelines and valves connected with the steam turbine medium pressure cylinder, the steam turbine low pressure cylinder, the steam condenser, the radial turbo, the cooling device, the steam-water heat exchanger, the first water drain heat exchanger, the first station heating network heater, the second water drain heat exchanger and generator; a cooling steam pipeline is connected with the inlet pipe position of the steam turbine low pressure cylinder, and a cooling device and a regulating valve are arranged on the cooling steam pipeline; one part of steam extracted from the steam turbine medium pressure cylinder enters the first station heating network heater to supply heat, and the other part of the steam enters the radial turbo to apply work; drained water produced after heat exchange is performed on the steam through the steam-water heat exchanger and the first stationheating network heater enters into the two water drain heat exchangers to perform cascaded heating on part of heating network return water; and by changing the operation modes of the system in heatingseason and non-heating season, the high-efficiency operation of the system is realized. The system realizes cascaded heating of a heating network, and lowers irreversible losses in the heat exchangeprocess.

The invention discloses a high-efficiency jetting type heat exchange machine set, belonging to the technical field of energy source utilization. The high-efficiency jetting type heat exchange machine set consists of a high-efficiency jetting type heat pump, a water-water heat exchanger, a circulating water pump, a connection pipe, a valve and other accessories, wherein the high-efficiency jetting type heat pump is of a two-stage condensation and two-stage evaporation structure or a two-stage condensation and one-stage evaporation structure, and the connection pipe is divided into a working medium system pipe and a water system pipe, wherein the water system pipe is divided into primary side pipes and secondary side pipes, the primary side pipes are connected in series, and the secondary side pipes are connected in parallel and series. Depending on the jetting type heat pump technique, the high-efficiency jetting type heat exchange machine set disclosed by the invention can perform cascade utilization to the water supply heat of the primary side pipes through certain pipe connection manners, therefore, returned water temperature of the primary side pipes is greatly reduced, so that the returned water supply temperature difference of the primary side pipes is increased, and heat transfer capability of hot water of the primary side pipes and the secondary side pipes is greatly improved.

The invention relates to an air source heat pump unit capable of realizing continuous heat supply. The air source heat pump unit comprises a compressor unit, an indoor water heat exchange unit, a quasi-second-stage compression unit, an outdoor air heat exchange unit and a defrosting branch unit. According to the air source heat pump unit disclosed by the invention, the new technical scheme of quasi-second-stage compression, water-side double-stage heat exchange, and multi-branch heat taking and alternating defrosting, of an air source heat pump under the working condition of low environment temperature is adopted, firstly, a compressor is additionally provided with an air supplementing port, and a middle plate heat exchanger is additionally arranged in a system, so as to form heat pump circulation with the quasi-second-stage compression; secondly, double-stage heat exchange is adopted for the indoor water heat exchange unit, and two stages of heat exchangers are arranged, so as to furthest increase the temperature of circulating water, and the temperatures of supply and return water; and finally, an outdoor air heat exchanger of the air source heat pump is configured to be at leasttwo branched heat taking and defrosting systems capable of independently running, and defrosting operation is carried out on a fluorine-air heat exchange mechanism in each branch in an alternating manner one by one, so that alternating accurate defrosting and continuous heat supply are realized.

The invention discloses a method for reducing transmission and distribution energy consumption of a regional central heat supply network. The method comprises the steps of establishing a building heating entry jet flow mixing device of a building according to all of heat supply building heating entry within a heat supply range of a heat supply system, adjusting the opening degree of an electric valve of the building heating entry jet flow mixing device and the jet mixing ratio of the water jet flow mixing device, adjusting a transmission and distribution water pump configured for the heat supply network according to building heating mass requirement so as to adjust transmission and distribution flow of the heat supply network and achieve adjustment of all building heating entry positions. Under the situation that the flow of the heat supply system in the building is constant, the flows of the building heating entries connected with the heat supply network is reduced to reduce the transmission and distribution energy consumption of the heat supply network, electricity consumption of the transmission and distribution water pump, improve the temperature difference of supply water and return water and the ratio of the transmission and distribution flows of the building heating entries connected with the heat supply network to the flow of the building heat supply system, improve the adjustability and stability of hydraulic power and heating power of the building heat supply system, save device and maintain cost.

The invention discloses an efficient indoor heating system for a capillary pump. The efficient indoor heating system for the capillary pump comprises a secondary network indoor water supply transversepipe, a secondary network indoor return water transverse pipe, an evaporator, a steam conveying pipeline, a gas-liquid isolator, a liquid conveying pipeline, a pressure sensor, a pressure regulatingstorage device, an electric heating device, a programmable controller, an outdoor temperature sensor and a condenser. The evaporator is provided with a heating medium inflow port and a heating mediumoutflow port, and a plurality of capillary liquid absorbing cores are arranged in the evaporator in parallel. The system can significantly reduce the return water temperature of a secondary network, thereby increasing the supply and return water temperature difference of the secondary network and reducing the circulation pump flow and electric energy consumption of the secondary network; and meanwhile, the primary network return water temperature is reduced, the supply and return water temperature difference of a primary network is increased, the circulation pump flow rate and electric energyconsumption of the primary network are reduced, and energy-saving operation of a transportation and distribution system is realized.

A water mixing device for a water source heat pump unit relates to the water source heat pump central air-condition technical field. The invention comprises a water source heat pump unit and a water mixer connected with a water system inlet of the water source heat pump unit, an immersible pump which is arranged in the water source and extracts the water source and a water mixing pump which is connected with a water system outlet of the water source heat pump unit and extracts the discharged water from the water source heat pump unit. The structure is characterized in that the sectional area of the tank body of the mixer is greater than the main pipe area of the water system. The top of the mixer is vertically provided with a water inlet 1; the side of the mixer is horizontally provided with a water inlet 2. The water inlet 1 and the water outlet 2 are respectively connected with the water outlets of the water mixing pump and the immersible pump. The middle part of the inner chamber of the mixer is provided with a tapered flow equalization plate with micropores; the tapered node of the tapered flow equalization plate is upward vertically. Compared with the prior art, the invention can achieve the proper water mixing temperature, thereby having an energy-saving operation of the unit, prolonging the service life-span of the system and achieving water-saving operation.

The invention discloses a heat supply unit total heat recovery system with nearly zero energy consumption and a heat supply control method thereof. The heat supply unit total heat recovery system comprises a heat source system, a heat network system and a central heat supply control system, wherein the heat source system comprises a boiler, a dust remover, an induced draft fan, a desulfurizing tower, a chimney and a steam turbine; the heat network system comprises an original heat network system and a new heat network system; the original heat network system comprises a heat network heater, anoriginal heating user end, a first plate heat exchanger and a heat network circulating pump; and the new heat network system comprises a second plate heat exchanger, a heat pump heat supply unit, a new heat network heat supply control pipeline and a new heating user end. Through reducing the primary network water returning temperature and enlarging the primary network water supply and returning temperature difference, the heat supply unit total heat recovery system greatly improves the heat conveying capacity of the original heat network system, so that the investing and operating cost of theheat network system is reduced to the maximum on the condition of meeting the heating demand of the newly added heat network system; and with adoption of the heat supply control method provided by the invention, heat supply of the new heat network system saves more energy and is more efficient.

The invention belongs to the technical field of heating, and particularly relates to a self-driven compression type large temperature difference heat exchange unit. The heat exchange unit comprises asteam expansion circulation system, a steam compression circulation system and a heat exchanger, wherein the steam expansion circulation system comprises a high-temperature evaporator, an expander, acondenser and a working medium pump which are sequentially connected end to end; the steam compression circulation system comprises a low-temperature evaporator, a compressor, a condenser and a throttle valve which are sequentially connected end to end; the expander is connected to the compressor; primary network hot water flow in through the high-temperature evaporator, passes through the heat exchanger and then flows out from the low-temperature evaporator; and the flow path of secondary side hot water is any one or a combination of the following modes that secondary side hot water flows inthrough the heat exchanger and flows out of the condenser, or secondary side hot water flows in through the heat exchanger and flows out of the heat exchanger, or secondary side hot water flows in through the condenser and flows out of the condenser. The outlet temperature of the primary side can be lowered to be lower than the inlet temperature of the secondary side, extracted heat is conveyed tothe secondary side, the temperature difference of the primary side supply and return water is increased, the conveying efficiency is improved, and the conveying radius is increased.

The invention discloses a novel combined heat dissipation terminal system. The novel combined heat dissipation terminal system includes a backwater booster pump, an electric driven heat pump type airheater, a conventional indoor heat dissipation device, a small control cabinet, a main water supply horizontal pipe, a first water supply branch, a second water supply branch, a first main backwater horizontal pipe, a first backwater branch, a second backwater branch, a heater backwater pipeline and a second main backwater horizontal pipe. According to the novel combined heat dissipation terminalsystem, by using the electric driven heat pump type air heater, heat of a circulating heat medium of a secondary net is recovered, the backwater temperature of the secondary net is greatly lowered, the water temperature of a primary net is also lowered, and various low-temperature waste heat and renewable energy are promoted to be recycled and reused; by effectively increasing the temperature difference between supplying water and back water of the secondary net, the circulating flow of the secondary net under the same heat load conditions is reduced, and power consumption of a circulating pump is significantly reduced; and the temperature difference between supplying water and back water of the primary net is increased, the circulating flow of the primary net and the power consumption ofthe circulating pump are significantly reduced, and energy-saving benefits are notable.

The invention discloses an energy-saving valve with intelligent control and a control method thereof. The energy-saving valve control method comprises the following steps that the a user set value isreceived and a system sampling value is received, detected and calculated; the deviation is calculated by comparing the user set value with the system sampling value; whether the user set value and the system sampling value heave a deviation over a set range or not is determined; if yes, a user deviation value is obtained; an opening operating value of the energy-saving valve is calculated based on the user deviation value and the user set value; opening adjustment of the energy-saving valve is executed based on the opening operating value; and the user set value and the system sampling valueare balanced. The stability and precision control of the system operation are realized, the comfort is improved, and the operating cost is saved.

The invention relates to a large-temperature-difference centralized heat supply system adopting double condensers. The system device is composed of a steam turbine, an absorption heat pump, a first-stage condenser, a second-stage condenser, a steam-water heat exchanger, a large-temperature-difference heat exchange system, various water pumps and pipelines. A double-condenser series structure is adopted, exhaust steam waste heat is absorbed by the first-stage condenser, and the absorption heat pump, the steam-water heat exchanger and the large-temperature-difference heat exchange system are used for applying the absorbed exhaust steam waste heat to urban heating; the first-stage condenser is limited by actual working conditions, and all the exhaust steam cannot be cooled and condensed; andfor the purpose of ensuring the power generation efficiency of a power plant, the two-stage condenser is adopted to cool the residual steam passing through the first-stage condenser, and the second-stage condenser adopts river, lake and sea water as cooling water. The double-condenser structure not only realizes efficient recovery of the exhaust steam waste heat, but also is used for isolating thecooled river, lake and sea water from the absorption heat pump system, and prevents the absorption heat pump and other system equipment from being corroded by the river, lake and sea water.