CN211260990U - Steam heat transfer constant pressure water charging system - Google Patents

Abstract

The utility model discloses a steam heat exchange constant pressure water supply system, which is characterized in that the steam heat exchange constant pressure water supply system comprises a water heat exchanger, a condensed water heat exchanger, a hot water main pump, and a hot water backup pump , expansion tank. The municipal steam is divided into two circuits, the branch circuit is connected to the expansion water tank, the main circuit is condensed water after heat exchange through the hot water heat exchanger, and then divided into two circuits after passing through the condensed water heat exchanger, and the branch circuit is connected to the heat exchanger. The inlet of the water backup pump, the main road is discharged to the outside. After the hot water return water is preheated by the condensed water heat exchanger, it is finally exchanged by the hot water heat exchanger to form a hot water supply, and is sent to the user through the hot water main pump and the hot water backup pump. The hot water supply pipe after the pump There is an expansion tank on it. It can not only meet the normal and stable operation of the steam hot water heat exchange system, but also utilize the residual heat, residual pressure and residual water of steam and its condensate and idle standby water pumps to reduce investment costs and operating costs.

Description

A steam heat exchange constant pressure water supply system

technical field

The utility model relates to a steam heat exchange constant pressure water supply system, which is applied to various industrial workshops and civil buildings that use municipal steam as a heat source for heat exchange and use a hot water system. The steam and its condensed water can be used for constant pressure water supply, belonging to Hot water supply technology.

Background technique

All kinds of industrial plants and civil buildings generally have requirements for heating, air conditioning, living or process production, and need to use hot water of a certain temperature. When the heat source comes from municipal steam, the conventional practice is to set up a soda water heat exchanger, and the primary side municipal steam exchange After heating, condensate water is formed and discharged, and the secondary side is hot water return water to form hot water water supply output after heat exchange. As shown in Figure 1, a closed circulating hot water system on the secondary side of the heat exchanger is used to provide a constant pressure water supply device on the hot water supply pipeline.

However, in this way, a constant pressure water supply device is usually installed on the hot water return pipe. It is necessary to regularly supply gas to the expansion tank for constant pressure, supply tap water and other water sources to supply water, and equip a supply pump to send the supply water to the hot water system. This is not only Need to configure related equipment, but also need to consume a certain amount of water, electricity, gas. On the other hand, the condensed water after the municipal steam heat exchange is directly drained, the waste heat and water are not fully utilized, and the energy utilization rate is low.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the technical solution of the present invention is to provide a steam heat exchange constant pressure water supply system. It can not only meet the normal and stable operation of the steam hot water heat exchange system, but also utilize the residual heat, residual pressure and residual water of steam and its condensate and idle standby water pumps to reduce investment costs and operating costs.

In order to achieve the above purpose, the utility model provides a steam heat exchange constant pressure water supply system, including a hot water heat exchanger, a condensed water heat exchanger, a hot water main pump, a hot water backup pump, and an expansion water tank. The municipal steam is divided into two circuits, the branch circuit is connected to the expansion water tank, the main circuit is condensed water after heat exchange through the hot water heat exchanger, and then divided into two circuits after passing through the condensed water heat exchanger, and the branch circuit is connected to the heat exchanger. The inlet of the water backup pump, the main road is discharged to the outdoor. After the hot water return water is preheated by the condensed water heat exchanger, it is finally exchanged by the hot water heat exchanger to form a hot water supply, and is sent to the user through the hot water main pump and the hot water backup pump. The hot water supply pipe after the pump There is an expansion tank on it.

Preferably, before the municipal steam enters the hot water heat exchanger, it is decompressed by a pressure reducing valve to the constant pressure required by the expansion tank and then connected to the expansion tank.

Preferably, the expansion tank is arranged on the hot water supply pipe behind the hot water main pump and the hot water backup pump, the top is provided with a safety valve, the tank wall is connected with the municipal steam, and the bottom is connected with the hot water supply.

Preferably, the hot water heat exchanger is a steam-water heat exchanger, the condensed water outlet formed after the heat exchange of the primary side municipal steam is connected to the primary side inlet of the condensed water heat exchanger, and the secondary side hot water return water inlet is connected to the condensed water inlet. The outlet of the secondary side of the water heat exchanger is connected, and the outlet of the hot water supply is connected to the main hot water pump and the hot water backup pump.

Preferably, the condensed water heat exchanger is a water-to-water heat exchanger, the primary side outlet is connected to the condensed water drainage, the secondary side inlet is connected to the hot water return water, and the valves on both sides are fully opened without adjustment.

Preferably, the inlet of the hot water backup pump is divided into two paths, one is connected to the hot water supply outlet of the hot water heat exchanger through the backup control valve, and the other is connected to the condensed water heat exchange through the bypass control valve and the check valve Condensate outlet.

Preferably, the hot water main pump and the hot water backup pump are both variable frequency pumps, the hot water main pump and the hot water backup pump adjust the flow according to the pressure difference between the hot water supply and the hot water return water, and the hot water backup pump can also The flow is adjusted according to the pressure of the expansion tank.

The beneficial effects of the utility model are: on the premise of ensuring the normal and stable operation of the steam hot water heat exchange system, the municipal steam is used to supplement the steam for the expansion tank, the municipal steam condensate is used to preheat the hot water return water, and the The water replenishment of the hot water system reduces the influence of the conventional tap water replenishment on the temperature of the hot water system due to low temperature. At the same time, the standby circulating pump of the hot water system doubles as a make-up pump, which improves the utilization rate of idle equipment. The utility model effectively utilizes the residual heat, residual pressure and residual water of steam and its condensed water, improves the energy use efficiency, and saves the investment cost and operation cost of equipment.

Description of drawings

FIG. 1 is a schematic diagram of a steam heat exchange constant pressure water make-up system in the prior art.

FIG. 2 is a schematic diagram of a steam heat exchange constant pressure water make-up system provided in this embodiment.

Description of reference numbers:

1 is municipal steam, 2 is condensed water, 3 is hot water heat exchanger, 4 is backup control valve, 5 is bypass control valve, 6 is check valve, 7 is hot water main pump, 8 is hot water backup pump, 9 is a pressure reducing valve, 10 is a safety valve, 11 is an expansion tank, 12 is a hot water supply, 13 is a hot water return, and 14 is a condensed water heat exchanger.

Detailed ways

In order to make the present utility model more obvious and easy to understand, preferred embodiments are described below in detail with the accompanying drawings.

Example

2 is a schematic diagram of a steam heat exchange constant pressure water replenishment system provided by this embodiment, the steam heat exchange constant pressure water replenishment system includes a hot water heat exchanger 3, a condensed water heat exchanger 14, a heat Main water pump 7 , hot water backup pump 8 , expansion water tank 11 . The municipal steam 1 is divided into two circuits, the branch circuit is connected to the expansion water tank 11, the main circuit is heated by the hot water heat exchanger 3 to form the condensed water 2, and the condensed water heat exchanger 14 is re-exchanged and divided into two circuits, The branch circuit is connected to the inlet of the hot water backup pump 8, and the main circuit is discharged to the outdoor. After the hot water return water 13 is preheated by the condensed water heat exchanger 14, it is finally exchanged by the hot water heat exchanger 3 to form a hot water supply water 12, and is sent to the user through the hot water main pump 7 and the hot water backup pump 8. An expansion tank 11 is provided on the hot water supply 12 pipe after the pump.

Before the above-mentioned municipal steam 1 enters the hot water heat exchanger 3, it is decompressed to the constant pressure required by the expansion water tank 11 through the pressure reducing valve 9 in a separate way, and then connected to the expansion water tank 11.

The above-mentioned expansion water tank 11 is arranged on the hot water supply 12 pipes behind the hot water main pump 7 and the hot water backup pump 8, the top is provided with a safety valve 10, the tank wall is connected with the municipal steam 1, and the bottom is connected with the hot water supply 12. .

The above-mentioned hot water heat exchanger 3 is a steam-water heat exchanger, the outlet of the condensed water 2 formed after the heat exchange of the municipal steam 1 on the primary side is connected to the inlet of the primary side of the condensed water heat exchanger 14, and the inlet of the hot water return water 13 on the secondary side is connected to the inlet of the primary side of the condensed water heat exchanger 14. The outlet of the secondary side of the condensate heat exchanger 14 is connected, and the outlet of the hot water supply 12 is connected to the main hot water pump 7 and the hot water backup pump 8 .

The above-mentioned condensed water heat exchanger 14 is a water-to-water heat exchanger, the primary side outlet is connected to the condensed water 2 for drainage, the secondary side inlet is connected to the hot water return water 13, and the valves on both sides are fully opened without adjustment.

The inlet of the above-mentioned hot water standby pump 8 is divided into two channels, one is connected to the outlet of the hot water supply 12 of the hot water heat exchanger 3 through the standby control valve 4, and the other is connected to the condensed water through the bypass control valve 5 and the check valve 6. The outlet of the condensed water 2 of the heat exchanger 14 is.

The above-mentioned hot water main pump 7 and hot water backup pump 8 are variable frequency pumps. The hot water main pump 7 and the hot water backup pump 8 adjust the flow according to the pressure difference between the hot water supply 12 and the hot water return 13. The hot water backup pump 8. The flow can also be adjusted according to the pressure of the expansion water tank 11.

When the hot water main pump 7 fails, the bypass control valve 5 is closed, the backup control valve 4 is opened, and the hot water backup pump 8 is started to conduct the circulation of the hot water system. When the pressure of the expansion water tank 11 drops and the hot water system needs to be replenished, the backup control valve 4 is closed, the bypass control valve 5 is opened, and the hot water backup pump 8 is started to replenish the hot water system.

Claims (7)

1. A steam heat exchange constant pressure water supply system, characterized in that the steam heat exchange constant pressure water supply system has a hot water heat exchanger (3), a condensed water heat exchanger (14), a hot water main pump ( 7), hot water backup pump (8), expansion tank (11); municipal steam (1) is divided into two paths, the branch is connected to the expansion tank (11), and the main path passes through the hot water heat exchanger (3) After heat exchange, condensate water (2) is formed, which is divided into two paths after heat exchange through the condensate water heat exchanger (14). After the water (13) is preheated by the condensate heat exchanger (14), it is finally exchanged by the hot water heat exchanger (3) to form a hot water supply (12), and is passed through the hot water main pump (7) and the hot water. The standby pump (8) is sent to the user, and an expansion water tank (11) is arranged on the pipe of the hot water supply (12) after the pump. 2. The steam heat exchange constant pressure water supply system according to claim 1, characterized in that, before the municipal steam (1) enters the hot water heat exchanger (3), it is reduced by a pressure reducing valve (9) in a separate way. The constant pressure required by the expansion water tank (11) is then connected to the expansion water tank (11). 3. The steam heat exchange constant pressure water supply system according to claim 1, wherein the expansion water tank (11) is arranged in the hot water main pump (7) and the hot water backup pump (8). The top of the water supply (12) pipe is provided with a safety valve (10), the tank wall is connected with the municipal steam (1), and the bottom is connected with the hot water supply (12). 4. The steam heat exchange constant pressure water supply system according to claim 1, wherein the hot water heat exchanger (3) is a steam-water heat exchanger, and the primary side municipal steam (1) is formed after heat exchange. The outlet of the condensed water (2) is connected to the inlet of the primary side of the condensed water heat exchanger (14), the inlet of the hot water return water (13) of the secondary side is connected to the outlet of the secondary side of the condensed water heat exchanger (14), and the hot water supply (14) 12) The outlet is connected to the main hot water pump (7) and the hot water backup pump (8). 5. The steam heat exchange constant pressure water supply system according to claim 1, wherein the condensed water heat exchanger (14) is a water-to-water heat exchanger, and the primary side outlet is connected to the condensed water (2) drainage, The secondary side inlet is connected to the hot water return water (13), and the valves on both sides are fully opened without adjustment. 6. The steam heat exchange constant pressure water supply system according to claim 1, characterized in that, the inlet of the hot water backup pump (8) is divided into two paths, and one path is connected to the hot water exchange via the backup control valve (4) The outlet of the hot water supply (12) of the heater (3) is connected to the outlet of the condensed water (2) of the condensed water heat exchanger (14) via the bypass control valve (5) and the check valve (6). 7. The steam heat exchange constant pressure water supply system according to claim 1, wherein the hot water main pump (7) and the hot water backup pump (8) are variable frequency pumps, and the hot water main pump (7) ) and the hot water backup pump (8) adjust the flow according to the pressure difference between the hot water supply (12) and the hot water return (13), and the hot water backup pump (8) can also adjust the flow according to the pressure of the expansion tank (11). .

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