RU2140043C1 - Heat and water supply system - Google Patents

Abstract

FIELD: thermal engineering; heat and hot water supply to apartment houses and industrial buildings. SUBSTANCE: system has central steam supply, delivery and return pipelines, heat and water supply line running to users, and jet pump. The latter that functions as heat- transfer and circulating apparatus has its active-medium feeding nozzle connected to steam supply through pipeline, its passive- medium feeding nozzle, to return pipeline, additional passive- medium feeder inlet, to water storage tank or to water supply, and its outlet branch pipe is connected to delivery pipeline of heat and water supply system. EFFECT: improved design of jet pump capable of performing functions of coolant circulation and heat-transfer apparatus. 2 cl, 2 dwg

Description

 The invention relates to a power system, heating systems and hot water supply of residential and industrial enterprises.

 In such systems, the circulation of the coolant is most often provided by circulation pumps.

 Examples of such systems are.

 "Low-temperature district heating system" according to the application DE N 4143026, publ. 07/01/93 (ISM, 1994, N 10-12), including a boiler, a circulation pump, supply and return pipelines, heat points.

 "Heating system" according to the application DE N 4409883, publ. 08/04/94, cl. F 24 D 3/02, containing the main heating source, the room heating and regulation system, feed pump, mains pump.

 "Open heating system" according to SU a.s. N 1508054, CL F 24 D 3/02, prior. 01/18/88, containing the base and peak heat sources with the supply and return pipelines connected to them, the heat consumption subsystem of residential areas, with supply and return pipelines, jumpers with pumps connecting the supply and return pipelines of each subsystem.

 "Heating and hot water system" according to SU a.s. N 1643879, class F 24 D 3/08, prior. 10/05/88, containing a boiler, a surface water heater, the inlet of the latter through the cooling line is connected to the outlet of the boiler by means of a supply main pipe, and the output is connected to the boiler inlet by means of a return main pipe equipped with a pump. The output of the surface water heater through the heating line is connected to the hot water supply pipe. The supply pipe of the heating network is connected to the supply main pipe. The return pipe of the heating network is connected to the return main pipeline.

 Technical solutions are known in which injectors or jet pumps are used as circulation pumps. Such systems include the following inventions.

 A. s. N 1762080, CL F 24 D 3/08, prior. 04.17.86, "Heat supply system" contains a heat exchanger, jet pump, direct and return heat supply lines, the first of which is connected to the hot water supply line and to the outlet pipe of the two-stage injector, and the second to the mixing chamber of the first injector stage. In this system, the heat source is geothermal wells with brine; therefore, the system design contains a separator and devices as a steam generator, allowing to separate the coolant in the primary circuit (brine) and the coolant of the secondary circuit - water. The circulation of coolants is provided by jet pumps, which allows, as in the present invention, not to supply additional energy, providing circulation of the coolant in the primary circuit. However, the jet pump in this design does not perform the function of a heat exchanger.

 The known "Method of heat supply to the consumer from the steam network" according to patent SU N 1210670, class. F 24 D 9/082, prior. 06/19/80, in which steam is generated in a central source, steam is transported through a steam network at an overpressure, and steam is condensed in a heat exchanger. The condensation of steam in the heat exchanger is carried out at overpressure by the return water of the heating system. The steam condensate is sent to the working nozzle of the heating system jet pump, and the return water of the heating system heated in the heat exchanger is supplied to its receiving chamber. In this invention, the jet pump does not use water as the active medium, but water; it does not perform the functions of heat exchange and supply of additional water.

 In the present invention, the jet pump performs several functions: it circulates the coolant in the consumer network and serves as a device for heat transfer, transfer of steam energy to the water circulating in the network, in addition, it provides the function of additional recharge of the coolant, especially for systems with high hot water consumption.

 The specified result is achieved as follows.

 The heat supply system contains a central steam source, direct and return pipelines, a consumer heat supply network, a jet pump having a nozzle for supplying an active medium and a nozzle for supplying a passive medium, and an outlet pipe.

 According to the invention, the jet pump, as a heat exchange device and circulation means, is connected through a pipe to a steam source through a nozzle for supplying an active medium. The nozzle for supplying a passive medium, the jet pump is connected to a return pipe, the input of the device for additional supply of a passive medium is connected to a water supply tank or a water supply source. The outlet nozzle of the jet pump is connected to a direct pipeline of the heat supply system.

 In order to provide automatic intake of the coolant from the water supply source or discharge of excess water in the system when the pressure rises, a pressure sensor is installed on the return pipe, the first valve is installed on the pipeline connecting the water supply tank or the water supply source to the device for additional supply of passive medium. A section of the return pipe between the pressure sensor and the nozzle for supplying a passive medium of the jet pump is connected to the water supply tank by another pipe through a second valve, both valves being connected to the pressure sensor via control channels with a positional regulator.

 The system operates by a jet pump. The steam entering the nozzle for supplying an active medium is accelerated by reducing the nozzle flow area. Water from the return pipe of the system enters through a nozzle for supplying a passive medium to the mixing chamber, where, interacting with steam, it is crushed to a finely dispersed state and due to the narrowing of the passage section of the mixing chamber, the mixture is accelerated. Steam, giving off heat to water, cools, partially condenses. Due to the decrease in the volumetric vapor content, a further pressure drop occurs in the mixing chamber, while the water is crushed to a finely dispersed state, which improves the heat transfer conditions and contributes to further condensation of the vapor phase. Then, flow deceleration occurs, accompanied by a shock wave with complete vapor condensation, and an increase in static pressure. Due to braking, a pressure is created at the outlet of the jet pump in the diffuser, which circulates hot water in the consumer circuit.

 An additional supply of a passive medium from a reservoir of water or a source of water supply is performed through a device for an additional supply of a passive medium of a jet pump. Such a device is performed on a cylindrical section of a jet pump in the form of a channel connected by a pipeline through a valve to a water supply tank or a water supply source. The additional water in the tank may be under atmospheric pressure, since in the cylindrical section of the jet pump, before the condensation jump, the static pressure is lower than atmospheric.

 The automatic supply of additional water when the pressure drops below the set value and the discharge of excess water from the line when the threshold pressure is exceeded is carried out automatically. The pressure sensor in the first case opens the valve on the pipeline connecting the device for additional supply of the passive medium of the jet pump, in the second case it opens the valve on the pipeline connecting the return pipe to the water supply tank or water supply source.

 The proposed system has novelty and meets the criterion of inventive step, as it has new properties. The jet pump performs three functions: it provides heat carrier circulation in the consumer network, serves as a heat exchange device, transfers steam energy to the water circulating in the network and provides the net with coolant.

 The invention is illustrated by drawings.

 In FIG. 1 shows a diagram of a heat supply system, in FIG. 2 is a drawing of a jet pump.

 The heat supply system comprises a central steam source 1, a heat supply network of consumers 2 of an open or closed type, a direct (supply) pipe 3 and a return pipe 4 to the consumer network. Pipeline 5 for supplying steam to the nozzle for supplying an active medium 7 of the jet pump 6. The jet pump 6 has a nozzle for supplying a passive medium 8, an outlet pipe 9. A nozzle for supplying a passive medium 8 is connected to the return pipe 4. Device input for additional supply of a passive medium 10 is connected to the water supply capacity (water supply source) 11 and the outlet pipe 9 is connected to a direct pipe 3 of the heat supply network 2.

 A pressure sensor 12 is installed on the return pipe 4, a first valve 15 is installed on the pipeline 14 connecting the water supply tank (water supply source) 11 with the device for additional supply of the passive medium 10, the section of the return pipe 8 between the pressure sensor 12 and the nozzle for supplying the passive medium 8 the jet pump 6 is connected to the reservoir of water (water supply) 11 by another pipe 17 through a second valve 16, both valves 15, 16 through the control channels are connected to the pressure sensor 12.

 The active medium is, in particular, water vapor that carries additional energy for the operation of the jet pump and heating of the coolant, water. The passive medium is a coolant, in particular water.

 The heat supply system operates as follows.

 The central steam source 1 (Fig. 1), for example a steam boiler, feeds steam through a pipe 5 to a nozzle for supplying an active medium 7 of a jet pump 6. Through a return pipe 4, cooled water enters a nozzle for supplying a passive medium 8 from a heat supply network 2, the same jet pump 6. The steam entering the nozzle for supplying the active medium 7 of the jet pump 6 (Fig. 2) is accelerated, mixed in the mixing chamber with water entering through the nozzle for supplying the passive medium 8. In the mixing chamber of the jet pump 6, acceleration flow and process heat exchange between steam and water. In the cylindrical section of the jet pump 6, an additional water flow is supplied through the device for additional supply of the passive medium 10. In the cylindrical section of the jet pump 6, the flow has a reduced pressure, so the additional water can also be under atmospheric pressure. At the exit 9 of the jet pump 6, hot water is inhibited, the pressure rises, which provides the necessary parameters in the heat supply network of consumers 2.

 Thus, the jet pump 6 performs the functions of a circulation pump, a heat exchanger and a pump for feeding the heat supply network of consumers 2 with additional coolant. Further, through the direct pipeline 3, hot water is supplied to the heat supply network 2, and the chilled water returns from the network to the jet pump 6 via the return pipe 4.

 The heat supply system allows you to automatically monitor the pressure in the heat supply network of consumers 2 and, if necessary, automatically add coolant at high flow rates, accidents in the pipelines of the network, as well as dump excess coolant from the network when normal pressure is exceeded.

 When the pressure in the return pipe 4 increases, the pressure sensor 12 gives the command to open the second valve 16 through the control channel, and excess coolant is discharged through the pipe 17 into the water storage tank 11. When the pressure in the return pipe 4 decreases, the pressure sensor 12 gives the command for the the opening of the first valve 15 and additional coolant from the reservoir of water supply or the source of water supply 11 through a pipe 14 is fed to the input of the device for additional supply of a passive medium 10.

 The capacity of the water supply can be a deaerator, usually used in water treatment systems and as a backup source of coolant. The system may not be equipped with a water supply capacity, but replenished directly from a water supply source.

 Thus, the heat supply system allows simple means to provide heat transfer, circulation and supply of additional coolant. The system has a high efficiency, since no additional energy, such as electrical energy, is consumed in the movement of the coolant.

Claims (2)

 1. A heat supply system comprising a central steam source, direct and return pipelines, a consumer heat supply network, a jet pump having a nozzle for supplying an active medium and a nozzle for supplying a passive medium and an outlet pipe, characterized in that the jet pump as a heat exchange device and means circulation by a nozzle for supplying an active medium is connected through a pipeline to a steam source, by a nozzle for supplying a passive medium - to a return pipe, an input of a device for additional supply of a pass the external medium is connected to a water supply tank or a water supply source and the outlet pipe is connected to a direct pipeline of the heat supply network.  2. The heat supply system according to claim 1, characterized in that a pressure sensor is installed on the return pipe, a first valve, a return pipe section between the pressure sensor and the nozzle, is installed on the pipeline connecting the water supply tank or the water supply source to the device for additional supply of a passive medium for supplying a passive medium of the jet pump, it is connected to the water supply tank or to the water supply source by another pipeline through a second valve, both valves being connected via control channels to pressure sensor.

Images