RU2319902C1 - Hot water supply system - Google Patents

Abstract

FIELD: heat power engineering.

SUBSTANCE: hot water supply system comprises source of steam, supply and return pipelines, hot water supply system, jet pump provided with the nozzle for supplying active fluid and nozzle for supply of passive fluid, and outlet branch pipe. The jet pump, circulation unit, and nozzle for supply of the active fluid are connected with the steam source through a pipeline. The nozzle for supply of the passive fluid is connected with the return pipeline. The outlet branch pipe is connected with the supply pipeline of the hot water supply system. The inlet of the supply pipeline is connected with the outlet of the return pipeline through a control valve.

EFFECT: improved control of supply.

4 cl, 2 dwg

Description

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

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

A.c. No. 1762080, F24D 3/08, prior. 04/17/86. The "heat supply system" comprises a heat exchanger, a jet pump, a direct and return heating main, 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, which allow to separate the coolant in the primary circuit (brine) and the coolant of the secondary circuit - water. The circulation of the coolant is provided by jet pumps, which allows, as in the present invention, not to spend additional energy on the 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 well-known "Method of heat supply to the consumer from the steam network" according to patent SU No. 1210670, class. F24D 9/082, prior. 06/19/80, in which steam is generated in a central source, steam is transported through the 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 an 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 invention RU No. 2140043 “Heat supply system” F24D 9/02, publication 20.10.1999, the system comprises a central steam source, direct and return pipelines, a heat supply network for consumers, a jet pump having a nozzle for supplying an active medium and a nozzle for supplying a passive medium, and outlet pipe.

According to the invention, the jet pump as a heat exchange device and means of circulation with a nozzle for supplying an active medium is connected through a pipeline to a steam source. The jet pump nozzle for supplying a passive medium 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 this invention, a jet pump performs several functions: it circulates the coolant in the consumer network and serves as a device for heat transfer, transferring steam energy to the water circulating in the network. In addition, it provides the function of additional replenishment of the coolant, especially for systems with high consumption of hot water.

However, this system has one drawback - it is impossible to regulate either the flow rate or the temperature of the coolant. The flow rate through the jet pump and its injection coefficient (ratio of water flow to steam flow) depend on the temperature of the water entering the jet pump inlet. The injection coefficient uniquely determines the heating of water in the jet pump, and the heat power transmitted to the consumer is proportional to the product of the flow rate for heating the water in the jet pump.

A feature of a jet pump is a characteristic similar to that of a volumetric pump — the flow rate through the jet pump is independent of the back pressure at the outlet of the jet pump. It is not possible to regulate the flow rate of such a pump with a valve located at the pump outlet (as with vane pumps). Thus, the temperature of the water entering the inlet of the jet pump uniquely determines the flow rate through the jet pump, the injection coefficient of the jet pump and the heat power transmitted to the consumer. In a real heat supply network, it is necessary to control the flow rate and / or the injection coefficient of the jet pump, regardless of the temperature in the return pipe, in order to ensure the transfer of the set thermal power to the consumer.

The technical result achieved in this invention is that in the heat supply system, the flow rate and, as a consequence, the heat power transmitted to the consumer can be controlled.

This result is achieved in that the heat supply system contains a steam source, direct and return pipelines, a heat supply network for consumers, a jet pump having a nozzle for supplying an active medium and a nozzle for supplying a passive medium and an outlet pipe. The jet pump as a heat exchange device and means of circulation with a nozzle for supplying an active medium is connected through a pipeline to a steam source, a nozzle for supplying a passive medium is connected to a return pipe and an outlet pipe is connected to a direct pipeline of the heat supply network. The difference is that the inlet of the direct pipe is connected to the output of the return pipe through a control valve.

The presence of the valve allows you to bypass part of the warmer water from the direct pipe to the return pipe (i.e., into the nozzle for supplying the passive medium of the jet pump), bypassing the heat supply network of consumers. When the control valve is opened, warmer water from the direct pipe flows under the pressure of the jet pump into the return pipe. The warmer water coming from the direct pipe heats the water in the return pipe. An increase in the temperature of the water entering the nozzle for supplying a passive medium of the jet pump causes a corresponding change (decrease) in the flow rate through the jet pump and a change (decrease) in the heat power transmitted to the consumer.

Thus, the control valve allows you to adjust the parameters of the consumers ’heat supply network: flow rate and power (the injection coefficient and, accordingly, the heating of the water in the jet pump vary slightly).

For automatic control of the system, a temperature sensor can be installed in the return pipe, connected via a control circuit to the valve.

The water supply capacity or the water supply source through the make-up valve can be connected to the return pipe, which allows replenishing the coolant loss.

At the inlet of the direct pipeline after the jet pump, a valve can be installed to discharge excess coolant.

The invention is illustrated by drawings. In Fig.1 shows a diagram of heat supply, Fig.2 is a diagram of a jet pump.

The heat supply system (Fig. 1), contains a steam source 1, a straight pipe 2, a return pipe 3, a consumer heat supply network 4, a jet pump 5. The jet pump 5 (Figure 2) has a nozzle 10 for supplying an active medium and a nozzle 11 for supplying passive medium and outlet pipe 12. The jet pump 5 as a heat exchange device and circulation means, nozzle 10 is connected through a pipe to a steam source 1, nozzle 11 for supplying a passive medium to a return pipe 3 and output pipe 12 to a direct pipe 2. Direct inlet labor piping 2 is connected to the output of the return pipe 3 through a control valve 6. On the return pipe 3 there is a temperature sensor 7 connected in a control circuit to the valve 6.

A water supply tank or a water supply source (not shown) is connected to a return pipe 3 through a make-up valve 8. At the inlet of the direct pipe 2, a valve 9 is installed after the jet pump 5 to discharge excess coolant.

As the jet pump 5, in particular, the jet pump described in patent RU No. 2116522, publication 1998.07.27 can be used.

The central source of steam 1 (Fig. 1), for example a steam boiler, feeds steam through a pipe into the nozzle 10 for supplying the active medium of the jet pump 5. Through the return pipe 3 from the heat supply network 4, cooled water enters the nozzle 11 for supplying a passive medium of the same jet pump 5. The steam entering the nozzle for supplying the active medium 11 of the jet pump 5 (FIG. 2) is accelerated, mixed in the mixing chamber with water entering through the nozzle for supplying the passive medium 11. In the mixing chamber of the jet pump 5 there is a further acceleration of two phase flow and steam condensation. Further, through the direct pipeline 2, hot water is supplied to the heat supply network 4, and the chilled water returns from the network to the jet pump 5 through the return pipe 3.

If it is necessary to reduce the consumption in the network and the heat power transmitted to the consumer, the control valve opens 6. When the control valve 6 is opened, warmer water from the direct pipe 2 under the pressure of the jet pump 5 flows into the return pipe 3. The warmer water coming from the direct pipe warms up water in the return pipe. An increase in the temperature of the water entering the nozzle 11 for supplying a passive medium of the jet pump 5 causes a corresponding change (decrease) in the flow rate through the jet pump and a change (decrease) in the heat power transmitted to the consumer 4. If it is necessary to increase the flow rate in the network and the heat power transmitted to the consumer , valve 6 closes, and everything happens the other way around.

The jet pump 5 constantly introduces into the heat supply system a flow equal to the steam flow. If the steam flow rate to the jet pump 5 is greater than the flow rate to the hot water supply, then the heat carrier must be removed from the circuit, which is carried out through valve 9. If the steam flow rate to the jet pump 5 is lower than the flow rate to the hot water supply, it is necessary to enter the heat transfer system, which is carried out through valve 8. Almost the first takes place at night, when the flow rate for hot water supply is almost absent, the second - during the day.

Claims (4)

1. A heat supply system containing a steam source, direct and return pipelines, a heat supply network for consumers, a jet pump having a nozzle for supplying an active medium and a nozzle for supplying a passive medium and an outlet pipe, while the jet pump as a heat exchange device and means for circulating the nozzle for the supply of the active medium is connected through a pipeline to a steam source, the nozzle for supplying a passive medium is connected to a return pipe and the outlet pipe is connected to a direct pipe of the heat supply network Characterized in that the direct input conduit connected to the outlet of the return line through the control valve. 2. The heat supply system according to claim 1, characterized in that a temperature sensor is installed on the return pipe, connected via a control circuit to the valve. 3. The heat supply system according to claim 1, characterized in that the capacity of the water supply or the water supply through the make-up valve is connected to the return pipe. 4. The heat supply system according to claim 1, characterized in that a valve is installed at the inlet of the direct pipeline to discharge excess coolant.

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