RU2810958C1 - Heat supply system and method for organizing its operation - Google Patents

Abstract

FIELD: heat supply systems.

SUBSTANCE: heat supply system includes a consumer in the form of heating devices and two DHW heat exchangers, a supply pipeline through which the hot coolant from the heating network is supplied to the consumer, a return pipeline through which the cooled coolant returns to the heating network, two single-section diaphragm pumps, which are the left and right sections, each section is divided by diaphragms on the pumping and working chambers, the diaphragms are interconnected by a rigid rod, the inputs of the heating devices are connected in parallel to the working ones, as well as to the pumping chambers of the right or left sections of the diaphragm pump through the pressure check valves of the right or left sections, hot water supply heat exchangers, connected in series via a heated water and being heat exchangers of the first and second heating stages, the working chambers are equipped with inlet and outlet valves, which are connected mechanically to the membranes through switching devices of the inlet and outlet valves, each section of the membrane pump is connected to both heating devices, due to the fact that the outlets of the heating devices, suction check valves and a check valve are connected through the first stage of the hot water supply heat exchanger, while a heated water flow regulator is installed at the inlet of the hot water supply heat exchanger of the second stage, and a weather control regulator is installed at the inlet of the supply pipeline, connected to a control heat exchanger installed on the bypass of the return pipeline in parallel to valve. The method for organizing the operation of the heat supply system consists in taking hot coolant from the heating network through the supply pipeline, periodically distributing the hot coolant into two dependent circuits using a system of inlet and outlet valves with switching devices and mechanical drive from diaphragms, creating periodic pulsations of hot and cooled in the first stage of hot water supply coolant mixed after the first and second passage through the heating devices by two sections of a diaphragm pump connected by a rod by using the pressure difference between the hot and cooled coolants, also generates a hydraulic shock, the energy of which is used to accelerate the filling of the working chambers and give the initial impulse to the diaphragms, preheating of heated water in the hot water supply heat exchanger of the first stage by coolant passing through it mixed after the first and second passes through the heating devices, transferring the heat of the hot and cooled coolant to the surrounding air and water heated in the hot water supply heat exchangers, returning the cooled coolant to the heating network through the return pipeline, while the final heating of the heated water in the second stage of the hot water supply heat exchanger is ensured by regulating the flow of hot coolant with a regulator supplied independently of the two-section diaphragm pump, and the pulsation frequency of the latter is set by the pressure difference between the supply and return pipelines and is adjusted depending on the outside air temperature.

EFFECT: increasing the operating efficiency of consumers (heating devices and DHW heat exchangers) of the heat supply system due to a deeper use of the coolant potential (temperature and pressure) at the pulsation frequency of a two-section diaphragm pump, automatically adjusted depending on the available pressure determined by the outside air temperature.

3 cl, 1 dwg

Description

The group of inventions relates to energy, in particular to heat supply systems.

An individual heating point is known for organizing a pulsed flow mode in it using a membrane pump for mixing the coolant, which is close in technical essence to the proposed technical solution. An individual heating unit with a membrane pump contains supply and return pipelines, two single-section diaphragm pumps, consisting of a pumping chamber and a working chamber, connected by a rigid rod and being the left and right sections of the membrane pump. The mechanical switching mechanism of the impact valves is connected on one side to a rigid rod, and on the other side to the right and left impact valves. Heating device in the form of a plate heat exchanger. A pulse flow distributor is installed at the entrance of an individual heating point, including the right and left valves of the pulse flow distributor, the right and left rods of the pulse flow distributor, the cam of the pulse flow distributor, not rigidly connected to the electric drive. A supply pipeline is connected to the input of the pulse flow distributor, and its outputs are connected to the working chambers of the left and right sections of the diaphragm pump through supply pipes. Additionally, a second heating device was introduced in the form of a plate heat exchanger. Each section of the diaphragm pump is connected only to its own heating device. The first heating device is connected to the right section of the diaphragm pump. To the left section of the diaphragm pump is the second heating device. The input of the first heating device is connected simultaneously to the working chamber of the right section of the diaphragm pump through the right shock valve and to the pumping chamber of the right section of the diaphragm pump through the discharge check valve of the right section. The input of the second heating device is connected simultaneously to the working chamber of the left section of the diaphragm pump through the left shock valve and to the pumping chamber of the left section of the diaphragm pump through the discharge check valve of the left section. The outputs of the heating devices are connected simultaneously to the return pipeline and, accordingly, to the pumping chambers of the right or left sections of the diaphragm pump through discharge recirculation check valves and suction check valves of the right or left sections (RU 183885, IPC F24D 3/02, published 10/08/2018).

The disadvantages of an individual heating point are its limited use (only in heating systems without hot water supply (DHW) heat exchangers) and a narrow range of coolant flow control.

The closest in technical essence to the proposed technical solution is a heat supply system including a supply pipeline, a consumer in the form of heating devices and DHW heat exchangers, a return pipeline, two pulse flow distributors with side outlets connected to a common electric drive, connected to one supply pipeline. A supply pipeline is connected in parallel to the inputs of pulse flow distributors with side outlets. Two single-section diaphragm pumps consisting of right and left sections, and each section includes working and pumping chambers connected by a rigid rod. Each working chamber is connected to a side outlet of a pulse flow distributor. Each pump chamber, respectively the right or left section of the diaphragm pump, is connected to its consumer through suction check valves and discharge check valves, and the latter through safety check valves and a return pipeline to the heating network. Heating devices and hot water supply heat exchangers are connected in parallel to the output of pulse flow distributors with side outlets through hot water flow regulators.

The essence of the method of organizing the operation of such a heat supply system is to take hot coolant from the heating network through a supply pipeline, periodically distribute the hot coolant into two independent circuits using a pulsed flow distributor with shock valves in the inlet and outlet openings and side outlets due to an electric drive, creating periodic pulsations of hot and cooled coolant by two sections of a diaphragm pump connected by a rod by using the pressure difference between the hot and cooled coolant, and also generate a hydraulic shock, the energy of which is used to reduce the lag of the rod speed in relation to the pressure force in its final positions, redistributing the pulsating coolant flow between parallel-connected heating devices and DHW heat exchangers, depending on the specified flow rate on DHW regulators, heat transfer of hot and cooled coolant to the surrounding air and water heated in DHW heat exchangers, return of the cooled coolant to the heating network through the return pipeline, protection of heating devices and DHW heat exchangers from increased pressure in the return pipeline through safety check valves (RU 2716545, IPC F24D 3/00, F24D 17/00, publ. 03/12/2020).

The disadvantages of the heat supply system are the small difference between the temperature of hot and chilled water passed periodically through heating devices, the limited range of regulation of hot water flow due to the external setting of the frequency of the pulse flow distributor, the formation of stagnant zones in the working chambers due to the remoteness of the pulse flow distributor, as well as the use of electrical energy to drive it.

The technical result consists in increasing the operating efficiency of consumers (heating devices and hot water supply heat exchangers) of the heat supply system due to deeper use of the coolant potential (temperature and pressure) at the pulsation frequency of a two-section diaphragm pump, automatically adjusted depending on the available pressure determined by the outside air temperature.

The essence of the invention is that the heat supply system includes a consumer in the form of heating devices and two DHW heat exchangers, a supply pipeline through which hot coolant from the heating network is supplied to the consumer, a return pipeline through which the cooled coolant returns to the heating network, two single-section diaphragm pumps on the left and right sections, each section is divided by diaphragms into pumping and working chambers, the diaphragms are interconnected by a rigid rod, the inlets of the heating devices are connected to the pumping chambers of the right or left sections of the diaphragm pump through the pressure check valves of the right or left sections, hot water supply heat exchangers, connected in series heated water and are heat exchangers of the first and second heating stages, the working chambers are equipped with inlet and outlet valves, which are mechanically connected to the membranes through switching devices of the inlet and outlet valves, each section of the membrane pump is connected to both heating devices, due to the fact that the outputs of the heating devices, suction check valves and a check valve are connected through the first stage of the hot water supply heat exchanger, while a heated water flow regulator is installed at the inlet of the hot water supply heat exchanger of the second stage, and a weather control regulator is installed at the inlet of the supply pipeline, connected to a control heat exchanger installed on the bypass of the return pipeline parallel to the valve.

The essence of the method of organizing the operation of the heat supply system is to take hot coolant from the heating network through the supply pipeline, periodically distribute the hot coolant into two dependent circuits by a system of inlet and outlet valves with switching devices and mechanical drive from diaphragms, creating periodic pulsations of hot and cooled in the first stage hot water supply mixed after the first and second passage of the coolant through the heating devices by two sections of a diaphragm pump connected by a rod by using the pressure difference between the hot and cooled coolants, and also generate a hydraulic shock, the energy of which is used to accelerate the filling of the working chambers and give an initial impulse of movement diaphragms, preheating of heated water in the hot water supply heat exchanger of the first stage by passing through it the coolant mixed after the first and second passes through the heating devices, transferring the heat of the hot and cooled coolant to the surrounding air and water heated in the hot water supply heat exchangers, returning the cooled coolant to the heating network through the return pipeline, while the final heating of the heated water in the second stage of the hot water supply heat exchanger is ensured by regulating the flow of hot coolant with a regulator supplied independently of the two-section diaphragm pump, and the pulsation frequency of the latter is set by the pressure difference between the supply and return pipelines and is adjusted depending on the outside air temperature .

The drawing shows a diagram of the heating system.

The heat supply system includes a supply pipeline 1, through which hot coolant from the heating network (not shown in the drawing) is supplied to the consumer as part of heating devices 2.3 and DHW heat exchangers 4.5, a return pipeline 6, through which the cooled coolant returns to the heating network, two single-section diaphragm pumps 7,8, membranes 9 and 10 of which are connected through a rod 11. Each of the single-section diaphragm pumps 7,8 consists of working chambers 12,13 and pumping chambers 14,15. The working chambers are equipped with inlet 16, 17 and outlet 18,19 valves, which are mechanically connected to the membranes through switching devices for inlet 20,21 and outlet 22,23 valves. The supply pipeline 1 is connected to the inlet valves 16,17 through the weather control regulator 30, and the heating devices 2, 3 and pumping chambers 14,15 are connected in parallel to the outlet valves 18,19. Each pump chamber 14,15 is hydraulically connected to its heating device 2 or 3 on the discharge side through a check valve 24 or 25, and on the suction side through a check valve 26 or 27, the first stage of the DHW heat exchanger 4 and in parallel with the return pipeline 6 through a check valve 28. The first 4 and second 5 stages of the DHW heat exchangers are connected in series through heated water, and at the entrance to the DHW heat exchanger of the second stage 5, a heated water flow regulator 29 is installed. In this case, the weather control regulator 30 is connected to the control heat exchanger 31, installed on the bypass of the return pipeline 6 parallel to valve 32.

A method of organizing the operation of a heat supply system includes the intake of hot coolant from the heating network (not shown in the drawing) through the supply pipeline 1, periodic distribution of the hot coolant into two dependent circuits by a system of inlet 16,17 and outlet 18,19 valves with inlet switching devices 20,21 and exhaust 22,23 valves and mechanically driven by diaphragms 9,10, creating periodic pulsations of hot and cooled hot water in the first stage 4 mixed after the first and second passage through the heating devices 2,3 of the coolant by two sections of the diaphragm pump connected by a rod 11 through the use pressure difference between the hot and cooled coolants, and also generate a hydraulic shock, the energy of which is used to accelerate the filling of the working chambers and give an initial impulse to the diaphragms, preheating the heated water in the DHW heat exchanger 4 of the first stage by passing through it mixed after the first and second passage of coolant through heating devices 2,3, heat transfer of hot and cooled coolant to the surrounding air and water heated in DHW heat exchangers, return of the cooled coolant to the heating network through the return pipeline 6, while the final heating of the heated water in the second stage of the DHW heat exchanger 5 is ensured by flow control hot coolant by regulator 29, supplied independently of the two-section diaphragm pump, and the pulsation frequency of the latter is set by the pressure difference between the supply and return pipelines and is adjusted depending on the outside air temperature.

The heat supply system works as follows. First, a connection is made between the supply pipeline 1 and the return pipeline 6, respectively, with the supply pipeline 1 and return pipeline 6 of the heating network (not shown in the drawing). After this, the hot coolant is supplied to the heating system until a pressure equal to that in the return pipeline 6 is created. At the initial moment of time, depending on the position of the diaphragms 9,10, the inlet valve 16 of the left working chamber 12, for example, is open, and the outlet valve 17 of the right the working chamber is closed due to their fixation by the switching devices of the inlet 20,21 and exhaust 22,23 valves, mechanically connected to the membranes 9,10. With this position of the valves of the working sections of a double-circuit diaphragm pump, the hot coolant through the open inlet valve 16 enters the working chamber 12 and does the work of the diaphragm 9 by moving the rod 11 from left to right due to the pressure difference in the left 12 and right 13 working chambers, displacing the hot coolant from the right 13 working chamber through the open outlet valve 19 of the heating device 3, where it gives off heat to the environment, and then to the input of the first stage DHW heat exchanger 4, at the same time, at the left, the cooled coolant from the left pump chamber 14 flows through the heating device 2 to the input of this heat exchanger, then they mixing, they pass through the DHW heat exchanger 4 of the first heating stage, giving off heat to the heated water returning from the recirculation pipeline (shown in the drawing), after the first stage of the DHW heat exchanger 4, one part of the cooled coolant from two circuits is sucked in by the right pump chamber 15 through the suction check valve 27, and the second part is discharged into the return pipeline 6 through the check valve 28. When the membranes 9,10 reach the extreme right position, the switching devices of the inlet 20,21 and exhaust 22,23 valves, mechanically connected to the membranes 9,10, will be activated, as a result of which the latter switch sharply, so , that, accordingly, the left inlet valve 16 will close and the right inlet 17 will open, and the left outlet valve 18 will open, and the right outlet 19 will close. With this position of the valves of the working sections of a double-circuit diaphragm pump, the hot coolant through the open inlet valve 17 enters the working chamber 13 and does the work of the diaphragm 10 by moving the rod 11 from right to left due to the pressure difference in the right 13 and left 12 working chambers, displacing the hot coolant from the left 12 working chamber through the open outlet valve 18 of the heating device 2, where it gives off heat to the environment, and then to the input of the first stage DHW heat exchanger, at the same time, cooled coolant from the right pump chamber 15 enters the right input of this heat exchanger through the discharge check valve 25, then they mix , pass through the first DHW heat exchanger 4, giving off heat to the heated water returning from the recirculation pipeline (shown in the drawing), after the first stage of the DHW heat exchanger 4, one part of the cooled coolant from two circuits is sucked in by the left pump chamber 14 through the suction check valve 26, and the second part is removed into the return pipeline 6 through the check valve 28. Moreover, through each heating device 2,3, a hot coolant is periodically passed, then a coolant mixed after the first and second passes through the heating devices 2,3 and cooled in the first stage 4 of the DHW heat exchanger. A sharp closing of the left 16 inlet valve will lead to a hydraulic shock, the increased pressure wave of which will contribute to the filling of the right 13 working chamber and accelerate the movement of the membrane 10 at the initial moment of time, when it is in the extreme right position. When diaphragms 9.10 reach the extreme left position, the valves will switch and the processes will be similar. If there is a delay in the regulation of the coolant temperature in the supply pipeline according to the quality control schedule, relative to rapid changes in the outside air temperature (more than 1°C per minute), the temperature of the cooled coolant at the outlet of the control heat exchanger 31 will change and the weather controller 30 will make adjustments to the flow of the hot coolant by changing the frequency of the two-section membrane pump.

The performance of a two-section diaphragm pump in a heating system is determined by the pulsation frequency of the two-section diaphragm pump, which is set by the pressure difference between the supply and return pipelines and is adjusted depending on the outside air temperature. The used pressure difference between the supply and return pipelines to drive a two-section diaphragm pump is 50-100 kPa. The operating frequency range of a two-section diaphragm pump is 0.5-2.5 Hz.

Claims (2)

1. Heat supply system, including heating devices, supply and return pipelines, two hot water supply heat exchangers, two single-section diaphragm pumps, which are left and right sections, each section is divided by diaphragms into pumping and working chambers, the diaphragms are interconnected by a rigid rod, each section of the diaphragm pump is connected to heating device, the inputs of the heating devices are connected in parallel to the working ones, as well as to the pumping chambers of the right or left sections of the diaphragm pump through the discharge check valves of the right or left sections, the outputs of the heating devices are connected simultaneously to the return pipeline and, accordingly, to the pumping chambers of the right or left sections of the diaphragm pump through suction check valves of the right or left sections, characterized in that each section of the diaphragm pump is connected to its own heating device, hot water supply heat exchangers are connected in series with heated water and are heat exchangers of the first and second heating stages, the working chambers are equipped with inlet and outlet valves, which are mechanically connected to the membranes through switching devices of the inlet and outlet valves, the outputs of the heating devices, suction check valves and the check valve are connected through the first stage of the hot water supply heat exchanger, while a heated water flow regulator is installed at the inlet of the second stage hot water heat exchanger, and at the inlet of the supply pipeline, a weather control regulator is installed, connected to a control heat exchanger installed on the bypass of the return pipeline parallel to the valve. 2. A method of organizing the operation of a heat supply system, which consists in taking hot coolant from the heating network through a supply pipeline, periodically distributing the hot coolant into two dependent circuits by a system of inlet and outlet valves with switching devices and mechanically driven from diaphragms, creating periodic pulsations of hot and cooled in the first stages of hot water supply mixed after the first and second passage of the coolant through the heating devices by two sections of a diaphragm pump connected by a rod by using the pressure difference between the hot and cooled coolants, and also generate a hydraulic shock, the energy of which is used to accelerate the filling of the working chambers and give an initial impulse movement of diaphragms, preheating of heated water in the hot water supply heat exchanger of the first stage due to passing through it the coolant mixed after the first and second passes through the heating devices, transferring the heat of the hot and cooled coolant to the surrounding air and water heated in the hot water supply heat exchangers, returning the cooled coolant to the thermal network through the return pipeline, while the final heating of the heated water in the second stage of the hot water supply heat exchanger is ensured by regulating the flow of hot coolant with a regulator supplied independently of the two-section diaphragm pump, and the pulsation frequency of the latter is set by the pressure difference between the supply and return pipelines and is adjusted depending on the outside temperature air.