RU2200879C2 - Method and device for ejection and heat exchange - Google Patents

Abstract

FIELD: heating and hot-water supply systems; jet facilities. SUBSTANCE: invention is designed for transfer of liquid by ejection in water supply system. According to invention, active medium (steam) is delivered in two independent flows which are swirled in opposite directions. Parameters of flows, namely, their pressure, temperature, flow rate, are regulated independently, and steam- water mixture is directed into device diffuser in two swirled flows, central one directed along axis of diffuser and peripheral one adjoining diffuser walls. In device implementing said method main flow feed branch pipe is arranged tangentially relative to ring chamber for swirling peripheral flow, and nozzle in chamber is made as ring slot formed by walls of outer confuser and housing. Delivery of auxiliary steam flow in center is provided by independent ring chamber, and swirling is provided by inclined holes in perforated ring partition installed inside housing on handled medium (water) central supply pipe. Second nozzle in form of ring slot is formed by walls of inner confuser and central pipe. EFFECT: increased heat exchange owing to intensification of mixing of media and control of capacity. 3 cl, 6 dwg

Description

 The invention relates to inkjet technology, mainly to methods for pumping liquid by ejection in heat supply systems and hot water supply and other heat power systems.

 Known methods for pumping liquids based on the transfer in the jet apparatus of the energy of the working (active) stream to the pumped (passive) medium and their subsequent joint transportation (for example, ed. St. 1581872, M. cl. F 04 F 5/04 "Method of ejection of the pumped Medium ", auth. St. 305279, M. class. F 04 F 5/08" Method for pumping liquids ", monograph Lyamaev B. F. Hydro-jet pumps and installations. L., Mechanical engineering, Leningrad branch, p. 20 -30 and pp. 60-69), as well as devices for their implementation (for example, ed. St. 901653, M. cl. F 04 F 5/02 "Jet Pump", ed. St. 1536076, M. cl. F 04 F 5/04 " zhektor "transonic jet apparatus -" Fisonic "Information brochure Ltd. company" Robbie ", M., Shmitovsky, 17;. WWW.ROBBI.RU INTERNET SHOP).

A disadvantage of the known methods and devices is the limited volume of the pumped medium (water) in the heat supply systems for transferring the heat transfer medium to the heat exchange points and for the hot water supply of remote consumers, as well as the difficulty in controlling the output characteristics of the transported stream (temperature, pressure, and other parameters). Known inkjet devices used in heat supply and hot water supply systems, for example, Fisonik devices, are designed for a maximum diameter of the conveying pipeline up to 100 mm, and pipes with a diameter of 400-600 mm and a water flow rate of 250-1500 m ³ / h are used in heat supply systems. It is important to ensure effective heat transfer of the active medium (steam) with the pumped medium (water), as well as to be able to control and control the input characteristics of the flows of the active and pumped media, and accordingly, the output parameters of the transported medium.

 The closest to the claimed method is a method of transporting a pumped medium by ed. St. 1581872, M. cl. F 04 F 5/04. In accordance with this method, to increase the efficiency of mixing active and passive media, their flows are twisted in opposite directions. In this case, the heat transfer process is significantly intensified and the efficiency of ejection increases.

 The disadvantage of this method is the limited pumped volume of the passive medium, the structural difficulty in implementation when using conveying pipes of large diameter and the limited ability to control the input and output characteristics of the transported medium.

 Devices for implementing the known method have the same disadvantages as the method. At the same time, in order to increase the productivity of jet devices, it is recommended to use jet devices with an annular nozzle instead of hydro-jet pumps with a central nozzle (for example, author certificate 901653, M. cl. F 04 F 5/02 “Jet pump”). The use of an annular active nozzle improves the efficiency of ejection. The proposed technical solution also allows you to split the transported flow of the passive medium into two, one of which has the ability to move in the center, and the second along the periphery of the mixing chamber, which increases the pump performance and intensifies heat transfer due to better mixing of the flows of active and passive media. However, the use of this scheme of an inkjet apparatus for transporting large volumes of a passive medium is also problematic and does not allow efficient control of the output parameters of the transported medium.

 The technical result of the claimed invention is to increase the heat transfer process by intensifying the mixing of media and regulating performance.

 The technical result is achieved by the fact that in the method of ejection and heat transfer of the pumped and active medium (steam), mainly in large volumes, when the active medium is fed with its swirl around the axis of the ejector and the axial supply of the pumped medium (water) and the medium is mixed, the active medium (steam ) are fed by two independent flows and swirl the flows in opposite directions, and the parameters of the active medium flows (pressure, temperature, flow) are independently controlled, and the steam-water mixture is sent to the diffuser by two screw flows - cent ral, directed along the axis of the diffuser, and peripheral, adjacent to the walls of the diffuser.

 In the device for implementing the method, comprising a housing with a mixing chamber, confusers, diffusers, an active medium supply system, concentrically mounted nozzles and a passive medium supply pipe, a main medium supply pipe, is located tangentially to the annular chamber, and the nozzle in the chamber is formed in the form of an annular slots by the wall of the external confuser and the wall of the housing, and the pipe for supplying the auxiliary flow of the active medium is mounted on the wall of the autonomous annular chamber, and the chamber is connected inclined to the the device’s hub with nozzles with the wall of the internal diffuser rigidly connected to the perforated annular partition mounted inside the housing on the central pipe for supplying the pumped medium, the holes in the partition being made at an angle to the axis of the device, while the wall of the internal confuser is rigidly connected to the annular partition, forming with the central pipe the second annular gap (nozzle).

 The proposed method and design for its implementation can increase the efficiency of heat transfer by activating the process of mixing media (steam and water) and provide control of the productivity of the ejected medium due to the formation in the jet apparatus of helical flows of the active medium with different input characteristics (pressure, temperature, flow), and the helical flows of the steam-water mixture are moved in opposite directions and mixed, reaching the desired output characteristics of the steam-water mixture. The application of the method and device for heat and water supply systems allows, without network pumps and boilers, to supply heated water to the system under a pressure that significantly exceeds the pressure of the components at the inlet, i.e. combine the functions of a boiler and a pump and ensure transportation of large volumes of hot water to heat exchangers and consumers.

 The device for implementing the method provides the possibility of embedding the inkjet apparatus through the flanges on the housing on both existing and newly created systems. The tangential location of the main flow supply pipe to the annular chamber formed on the housing allows the steam flow to be twisted and directed into the annular nozzle formed by the walls of the housing and the external confuser. A pipe for supplying an auxiliary steam stream is mounted on the wall of the second (autonomous) annular chamber, also formed on the device body, and connected by pipes to the wall of the internal diffuser, which forms an annular cavity with the walls of the central pipe for supplying the pumped medium, and a perforated annular partition is mounted on the pipe perpendicular to the axis holes located at an angle to the axis of the device, which ensures the twisting into the helical stream of the auxiliary steam stream in the opposite direction olozhnom main stream, and transmitting it to the second nozzle formed by the converging tube inner wall is rigidly associated with the perforated baffle and the central pipe for supplying a passive medium (water). The helical flows of the steam-water mixture enter the diffuser, where they are mixed. In this case, both flows — the central one, directed along the diffuser axis, and the peripheral one adjacent to the diffuser walls, can differ in their main characteristics (pressure, temperature, flow rate), which allows controlling the parameters of the transported coolant (hot water).

 A comparison of the known technical solutions with the claimed one showed that the essential distinguishing features of the proposed method are: the supply of an active medium (steam) by two independent flows with their twisting in opposite directions and the formation of two screw flows of steam-water mixture with different characteristics in the cavity of the diffuser.

 A device for implementing the method is also characterized by significant distinctive features, a set of new functional units and connections, which are: the tangential location of the nozzle for supplying the main flow of the active medium to the annular chamber of the device, the nozzle in the chamber being formed in the form of an annular gap by the wall of the external confuser and the wall of the housing; the nozzle for supplying the auxiliary flow of the active medium is mounted on the wall of an isolated (autonomous) annular chamber, and the chamber is connected by inclined pipes to the axis of the housing with the wall of the internal diffuser rigidly connected to the perforated annular partition mounted inside the housing on the central supply pipe of the pumped medium, and the holes in the partition made at an angle to the axis of the device, while the wall of the internal confuser, forming with the central tube w, is rigidly connected to the annular partition Sharp ring gap (nozzle).

 No technical solutions with similar distinguishing features in the patent and scientific literature were found, therefore, the claimed method and device have significant differences.

 Figure 1 shows a schematic diagram of a heating system and hot water supply; in FIG. 2 is a diagram of a device for implementing the method; figure 3 is a view a in figure 2 with the layout of the nozzles for supplying steam; in FIG. 4 - perforated partition; figure 5 is a section bb, figure 4, along the inclined holes for twisting the steam; 6 is a section along BB in FIG. 2 with a diagram of the formation of two helical steam flows.

 The device (inkjet apparatus CA) 1 (figure 1) that implements the method is installed using flanges on the main pipeline 2.

 To feed the system with an active medium (steam), a steam boiler 3 is intended, from which steam can be mixed with a passive medium (water) through an ink jet apparatus 1 and transported to consumers in the form of hot water. Steam consumption is regulated by a valve 4.

 The device 1 (inkjet apparatus) consists (Fig. 2) of a casing 5 made in the form of a pipe and provided with annular flanges for mounting on the main pipeline, an external diffuser 6 and a confuser 7, an internal diffuser 8 and an internal confuser 9, a central supply pipe 10 transported medium, perforated septum 11, inclined nozzles 12, two annular insulated chambers 13 and 14, inlet pipes 15 and 16.

 The method is as follows. The active medium (steam) from the steam boiler is fed into the annular chambers 13 and 14 on the housing 5 of the device 1 by two independent streams and swirl the flows relative to the axis of the device in opposite directions. Helical steam flows are directed into annular slots (nozzles). The suction of the transported medium (water) is also carried out by two streams - central and peripheral. The swirling screw flows of the steam-water mixture are sent to the external diffuser 6 of the device, mixed and transported in the form of hot water to the heat main.

 A device for implementing the method works as follows.

 The active medium (steam) through the nozzles 15 and 16 (see figure 2) enters the annular chambers 13 and 14 formed on the housing 5 of the device 1.

 The pipe 15 for supplying the main steam flow is installed tangentially (tangentially) to the annular chamber 13 (Fig.3) for swirling the steam flow around the axis of the device. The formed helical steam flow is directed into the nozzle in the form of an annular gap formed by the wall of the external confuser 7 (see Fig. 2) and the wall of the housing 5 of the device.

 The transported medium (water) is ejected from the inner cavity of the housing and, mixed with steam, forms a helical flow of steam-water mixture adjacent to the walls of the external diffuser 6 of the device (Fig.6).

 Auxiliary steam flow through the pipe 16 (see figure 2), mounted on the cylindrical wall of the insulated annular chamber 14, enters the cavity of the chamber 14 and passes through the inclined pipes 12 into the torus cavity formed by the walls of the inner diffuser 8 of the central pipe 10 and the end perforated partition 11. Passing through the holes made in the partition 11 at an angle α to the axis of the device (Figs. 4 and 5), the steam flow swirls in the opposite direction to the main steam flow and enters the nozzle in the form of an annular gap, the walls of the internal confuser 9 (see Fig. 2) and the central pipe 10. The transported medium (water) is ejected through the holes in the central pipe 10, mixed with steam, twists and forms a central screw flow (see Fig. 6), directed along external diffuser axis 6.

 In the cavity of the diffuser 6 there is an active mixing of two oppositely swirling flows and the mixture of coolants enters the heat main.

 Due to the exchange of pulses between the steam and transported water flows, high pressure is created at the outlet of the device. Therefore, heated water enters the main pipe under a pressure that significantly exceeds the pressure at the inlet to the jet apparatus. The resulting overpressure provides the circulation of the coolant in a closed loop (see figure 1).

 Twisting the heat carriers in two streams with independent input characteristics allows efficient heating of water and its transportation without the use of high-power network pumps and uneconomical boilers in heating and hot water supply systems.

Example
A steam boiler was used at the boiler room for heating and hot water supply, providing a maximum capacity of up to 20 t / h at a pressure of 0.6-0.9 MPa. The vapor temperature was 165 ^° C at a pressure of 0.6 MPa, and 179 ^° C at a pressure of 0.9 MPa ^. The diameter of the main pipeline was 400 mm.

The use of a built-in jet apparatus with steam inlet pipes ⌀100 and ⌀80 mm ensured the creation of pressure in the pressure line up to 1 MPa at a water temperature of 80 ^o C and a total water flow of 400 m ³ / h. Steam consumption was about 5% of the volume of transported water. The temperature of the return water from the consumer ("return") reached 50 ^o C.

 Saving only in energy consumption compared to traditional technology with pump and boiler units and a hot water boiler amounted to over 300,000 rubles per month.

Claims (2)

 1. The method of ejection and heat transfer of the pumped and active medium, mainly in large volumes, including the supply of the active medium (steam) with its twist around the longitudinal axis of the ejector, the axial inlet of the pumped medium (water) and mixing the media, characterized in that the active medium is fed by two independent flows and swirl the flows in opposite directions, and the parameters of the active medium flows (pressure, temperature, flow) are independently controlled, and the steam-water mixture is sent to the diffuser by two screw flows - central, to directed along the axis of the diffuser, and peripheral adjacent to the walls of the diffuser.  2. A device for implementing the method, comprising a housing with a mixing chamber, confusers, diffusers, an active medium supply system, concentrically mounted nozzles and a passive medium supply pipe, characterized in that the main medium supply pipe is located tangentially to the annular chamber, and the nozzle is in the chamber is formed in the form of an annular gap by the wall of the external confuser and the wall of the housing, and the nozzle for supplying the auxiliary flow of the active medium is mounted on the wall of the autonomous annular chamber, and the camera is connected it is not inclined to the axis of the housing of the device by nozzles with the wall of the internal diffuser rigidly connected to the perforated annular partition mounted inside the housing on the central pipe for supplying a pumped medium, and the holes in the partition are made at an angle to the axis of the device, while the wall of the internal confuser is rigidly connected to the annular partition forming a second annular gap (nozzle) with a central pipe.

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