A water-saving and energy-saving heat supply make-up water system and its usage method

Abstract

The present invention discloses a water-saving and energy-saving heat supply make-up water system and its usage method. The system includes a primary network, a heat exchange station, and a secondary network. A sealed water storage tank is provided in the heat exchange station. The sealed water storage tank is connected to the tap water supply pipeline. The sealed water storage tank is respectively connected to the primary network through a first pipeline and a first parallel pipeline, and is also connected to at least two secondary networks through a second pipeline and a second parallel pipeline. When using this system for make-up water, during the leakage repair of the secondary network, it is not necessary to drain the water in the secondary network and it can be used for other purposes. It can also use the original pressure of tap water to make up water for the secondary network, which is beneficial to energy conservation. When the primary network needs to be filled with water or make up water, multiple heat exchange stations can supply water to the primary network simultaneously, greatly improving the speed of water filling or make-up water.

Description

Technical Field

[0001] The present invention relates to the field of heating, and more particularly to a water-saving and energy-saving heating make-up water system and a method for using the same. Background Art

[0002] Now, many northern cities adopt the method of centralized heating. For example, the hot water generated by heat sources such as thermal power plants or boilers is supplied to users for heating through the pipelines operated by heating companies. The pipelines include primary network pipelines and secondary network pipelines. The hot water generated by the heat source forms a cycle through the primary network. The primary network passes through heat exchange stations in multiple communities, and the heat is transferred to the water in the secondary network pipeline through a heat exchanger in the heat exchange station. After the water in the secondary network pipeline is heated, it is then transported to each household in the community. Generally, one heat exchange station drives multiple secondary network pipelines, and each secondary network is responsible for heating the households in one or several buildings. In this heating mode, water plays an important role as a heating medium. Whether it is the primary network or the secondary network, due to various losses, make-up water is often required. The existing make-up water mode for the secondary network is to set an open water tank in the heat exchange station, a float valve is set in the water tank, the water tank is replenished with tap water to the set water level, and the water pump of the unit is used to make up water for the secondary network that needs to be replenished. The above-mentioned heating make-up water system has the following deficiencies: If a certain secondary network leaks, only the water in the secondary network can be drained completely for maintenance, and the water in the secondary network cannot be reused, resulting in a waste of thousands of tons of water; The water in the tap water pipeline has a pressure of about 0.25 MPa, but after the tap water is drained into the water tank, except for a small potential energy due to the increase in the water level in the water tank, the original pressure energy is basically lost and not reasonably utilized. When making up water for the secondary network, the water pump always needs to be started for make-up water, resulting in energy waste; At the beginning of the heating season, the primary network needs to be filled with water. Due to the huge scale of the primary network, simply filling the primary network with water from the existing single water source point generally takes more than ten days. If the primary network leaks during operation, the existing single water source point make-up water method has a slow make-up water speed, which will affect the effective use of the primary network. Summary of the Invention

[0003] The object of the present invention is to provide an energy-saving and water-saving heating make-up water system. When the secondary network leaks and needs to be repaired, the water in the secondary network does not need to be drained and can be used for other purposes. It can also utilize the original pressure of tap water to make up water for the secondary network. In this way, the water pump does not need to be started in the early stage of making up water for the secondary network, which is beneficial to energy conservation. When the primary network needs to be filled with water or make up water, multiple heat exchange stations can supply water to the primary network at the same time, greatly improving the filling or make-up water speed, which is beneficial to maintaining the smooth and efficient operation of the primary network.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A heat supply makeup water system for water and energy conservation, comprising a primary network, a heat exchange station and a secondary network. Heat exchange occurs between the primary network and the secondary network in the heat exchange station. It is characterized in that a sealed water storage tank is provided in the heat exchange station. The sealed water storage tank is connected to the tap water supply pipeline. The sealed water storage tank is connected to the primary network via a first pipeline and a first parallel pipeline respectively. A first water pump and a first one-way valve are provided on the first pipeline, and a first pressure reducing valve is provided on the first parallel pipeline. The sealed water storage tank is also connected to at least two secondary networks via a second pipeline and a second parallel pipeline respectively. A second water pump and a second one-way valve are provided on the second pipeline, and a second pressure reducing valve is provided on the second parallel pipeline.

[0006] The water flow directions of the first one-way valve and the second one-way valve are from the sealed water storage tank to the primary network or the secondary network. The water flow directions of the first pressure reducing valve and the second pressure reducing valve are from the primary network or the secondary network to the sealed water storage tank. Valves are installed on the tap water supply pipeline, the first pipeline and the first parallel pipeline, the second pipeline and the second parallel pipeline.

[0007] Preferably, the tap water supply pipeline is connected to a water softening device.

[0008] Preferably, a safety valve is installed on the sealed water storage tank.

[0009] Another object of the present invention is to provide a method for using the above system, and the following technical solutions are specifically adopted:

[0010] The method for using the heat supply makeup water system for water and energy conservation includes the following steps:

[0011] (a) The hot water generated by the heat source is sent out through the primary network and exchanges heat with the water in the secondary network through a heat exchanger in the heat exchange station. The water in the primary network cools down and is sent back to the heat source for reheating to form a cycle. The water in the secondary network heats up and is sent to users for heating and then cools down to form a cycle.

[0012] (b) When a leak occurs in the secondary network, the following situations are handled:

[0013] (b1) If other secondary networks need makeup water, open the valve on the second parallel pipeline of the leaking secondary network, so that the water in the leaking secondary network flows back to the sealed water storage tank through the second pressure reducing valve, and start the second water pump on the second pipeline of the secondary network that needs makeup water to replenish water to this secondary network;

[0014] (b2) If no other secondary networks need makeup water, open the valve on the second parallel pipeline of the leaking secondary network, so that the water in the leaking secondary network flows back to the sealed water storage tank through the second pressure reducing valve, and start the first water pump on the first pipeline of the primary network to replenish water to the primary network;

[0015] (c)When the tap water supply pipeline in a heat exchange station fails to supply water and the secondary network needs to be replenished with water, the valve on the first parallel pipeline is opened, so that the water in the primary network enters the sealed water storage tank through the first pressure reducing valve and supplies water to the secondary network that needs to be replenished, and the sealed water storage tanks in other heat exchange stations are used to replenish water to the primary network;

[0016] (d)When the primary network needs to be replenished with water, the first water pump on the first pipeline is opened to replenish water to the primary network;

[0017] (e)When the secondary network needs to be replenished with water, if the water pressure in the secondary network is lower than the water pressure in the sealed water storage tank, the second water pump is not started, but the water pressure in the sealed water storage tank is directly used to replenish water to the secondary network. If the water pressure in the secondary network is higher than the water pressure in the sealed water storage tank, the second water pump is started to replenish water to the secondary network.

[0018] In the above technical solution, the tap water directly enters the sealed water storage tank, which can maintain the pressure of the tap water. When replenishing water to the secondary network, if the pressure of the secondary network is lower than that of the tap water, there is no need to start the water pump, and the water can be directly replenished by the pressure of the sealed water storage tank. Generally, the leakage of the secondary network often occurs during the pressure test of the heating season. When a group of secondary network is found to be leaking after water injection and needs to be repaired, the tap water supply pipeline of the sealed water storage tank can be closed, and the water in the leaking secondary network can flow back to the sealed water storage tank through the pressure reducing valve of the second parallel pipeline and supply water to other secondary networks that need to be replenished, or the water can be directly discharged into the primary network. Due to the large capacity of the primary network, it is sufficient to accommodate the water of the secondary network. If the primary network needs to be replenished with water, the water replenishment requirement of the primary network can also be met. At the beginning of the heating season, the system allows the tap water of multiple heat exchange stations to inject water into the primary network at the same time, which will greatly shorten the time required for injecting water into the primary network. After the tap water of a heat exchange station fails and cannot replenish water, the primary network can also be used to replenish water to the secondary network, and the tap water of other heat exchange stations can be used to replenish water to the primary network, which improves the flexibility of the operation and control of the entire network. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the heating system;

[0020] Figure 2 is a schematic diagram of the water replenishment system;

[0021] Figure 3 is a schematic diagram of the heat exchange between the primary network and the secondary network. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] As Figure 1The figure shows a schematic diagram of a heating system, including a primary network 1. The hot water in the pipeline of the primary network 1 can be sourced from heat sources such as thermal power plants or boilers 101. The pipeline of the primary network 1 returns to the heat source 101 after passing through multiple heat exchange stations 2 to form a cycle. In the heat exchange station 2, the primary network 1 exchanges heat with the secondary network 3 through a heat exchanger 102. That is, after passing through the heat exchanger 102, the water temperature in the primary network drops, and the water temperature in the secondary network rises. Then, the heated hot water is sent to the heaters of each household through the secondary network for heating. Generally, there are multiple secondary networks 3 in each heat exchange station 2 that exchange heat with the primary network 1, and each secondary network 3 is responsible for heating a certain household area in the community.

[0024] As Figure 2 The figure shows a schematic diagram of a water replenishment system, including a sealed water storage tank 4. The sealed water storage tank 4 is installed in the heat exchange station 2. One side of the sealed water storage tank 4 is provided with a water inlet 5. The water inlet 5 is connected to the tap water supply pipeline 6 through a pipeline. A valve 51 is also provided in front of the water inlet 5. The valve 51 is generally in an open state and can replenish water into the water storage tank 4 in a timely manner. When the valve 51 is closed, the tap water supply pipeline 6 stops supplying water to the water storage tank 4. A safety valve 41 is also installed at the top of the sealed water storage tank 4. Further, a water softening device (not shown in the figure) is installed behind the valve 51. The water softening device can soften the water in the tap water supply pipeline 6 before flowing into the water storage tank 4.

[0025] A first water outlet 7 is provided on the sealed water storage tank 4. The first water outlet 7 is connected to the primary network 1 through a first pipeline 71. A first one-way valve 73 and a first water pump 74 are installed on the first pipeline 71. The first one-way valve 73 can control the water flow direction from the sealed water storage tank 4 to the primary network 1, and the water in the primary network pipeline cannot directly enter the sealed water storage tank through this pipeline. The first water pump 74 is used to pump the water in the sealed water storage tank 4 into the primary network. A first parallel pipeline 72 is also installed below the first water pump and the first one-way valve. A first pressure reducing valve 75 is installed on the first parallel pipeline 72. The first pressure reducing valve can be equipped with a switch valve. After the first pressure reducing valve 75 is opened, the water in the primary network pipeline can enter the sealed water storage tank 4 after the water pressure is reduced through the first pressure reducing valve 75.

[0026] There are at least two second water outlets 8 left on the sealed water storage tank 4. The second water outlet 8 is connected to the secondary network 2 through a second pipeline 81. A second water pump 83 and a second check valve 84 are successively installed on the second pipeline 81. A second pressure reducing valve 85 is also connected in parallel below the second one-way valve 84 and the second water pump 83. The second pressure reducing valve can be equipped with its own switch valve. The second pressure reducing valve 85 is installed on the second parallel pipeline 82. The water flow direction of the second check valve 84 is from the water storage tank 4 into the secondary network 2, and the second water pump provides driving force for it. The water in the secondary network 3 flows back into the sealed water storage tank 4 after passing through the second pressure reducing valve 85 on the second parallel pipeline 82. Valves can be installed on the tap water supply pipeline, the first pipeline and the second pipeline to enhance the on-off control of the water circuit. The first pressure reducing valve and the second pressure reducing valve can also not be equipped with their own valves, but non-valve opening and closing devices can be installed on the first parallel pipeline and the second parallel pipeline.

[0027] When the secondary network leaks and needs to be repaired, different operations are carried out on the water replenishing device according to different situations to achieve the purpose of water conservation, as follows:

[0028] When a certain secondary network leaks and exactly other secondary networks need water replenishment, at this time, open the second pressure reducing valve on the second parallel pipeline of the leaking secondary network, so that the water in the pipeline of this secondary network flows back into the water storage tank. At the same time, close the valve on the tap water supply pipeline and start the second water pump on the second pipeline of the secondary network that needs water replenishment to replenish water for this secondary network. In this way, the water on the leaking secondary network pipeline can be replenished to other secondary networks, which is beneficial to water conservation.

[0029] When no other secondary networks need water replenishment, first open the second pressure reducing valve on the second parallel pipeline of the leaking secondary network, so that the water in the pipeline of this secondary network flows back into the water storage tank. At the same time, open the first water pump on the first pipeline of the primary network to replenish water for the primary network. Due to the large capacity of the primary network, it is sufficient to accommodate the water of the secondary network.

[0030] Except for the case of leakage, when the tap water supply pipeline in the heat exchange station cannot supply water and the secondary network needs water replenishment, the first pressure reducing valve on the first parallel pipeline can be opened to make the water in the primary network enter the sealed water storage tank. At the same time, open the second water pump on the secondary network that needs to be replenished with water. In this way, water can be replenished for it, which can ensure the normal use of the secondary network during the emergency repair stage of the tap water supply pipeline. The sealed water storage tank in other heat exchange stations can also be used to replenish water for the primary network to prevent water shortage in the primary network.

[0031] When water replenishment is required in the primary network, the first water pump on the first pipeline of the primary network can be started to replenish the water in the water storage tank into the primary network. At the beginning stage of the heating season, the tap water in the water storage tanks of multiple heat exchange stations can inject water into the primary network simultaneously, which will greatly shorten the time required for primary network water injection.

[0032] In addition, since the sealed water storage tank is directly connected to the tap water supply pipeline, the water in the water storage tank has the same water pressure as the water in the tap water supply pipeline, usually 0.25 MPa. In this way, when the sealed water storage tank replenishes water for the secondary network, if the water pressure in the secondary network is lower than the water pressure in the sealed water storage tank, the second water pump does not need to be started, but the water pressure of the sealed water storage tank is directly used to replenish water for the secondary network; when the water pressure in the secondary network reaches the water pressure in the sealed water storage tank, the second water pump is started to replenish water for the secondary network. In this way, the use of the second water pump can be saved in the early stage, which is beneficial to energy conservation.

[0033] The above embodiments are only illustrative of the concept and implementation of the present invention, and do not limit it. Under the concept of the present invention, the technical solutions without substantial transformation are still within the protection scope.

Claims

1. A heat supply makeup water system for water and energy conservation, comprising a primary network, a heat exchange station and a secondary network. The primary network exchanges heat with the secondary network in the heat exchange station. It is characterized in that A sealed water storage tank is provided in the heat exchange station. The sealed water storage tank is connected to the tap water supply pipeline. The sealed water storage tank is respectively connected to the primary network through a first pipeline and a first parallel pipeline. A first water pump and a first check valve are provided on the first pipeline. A first pressure reducing valve is provided on the first parallel pipeline. The sealed water storage tank is also connected to at least two secondary networks through a second pipeline and a second parallel pipeline. A second water pump and a second check valve are provided on the second pipeline. A second pressure reducing valve is provided on the second parallel pipeline; the tap water supply pipeline is connected to the softened water device; a safety valve is installed on the sealed water storage tank.

2. The heat supply makeup water system for water and energy conservation according to claim 1, characterized in that The water flow directions of the first check valve and the second check valve are from the sealed water storage tank to the primary network or the secondary network. The water flow directions of the first pressure reducing valve and the second pressure reducing valve are from the primary network or the secondary network to the sealed water storage tank. Valves are installed on the tap water supply pipeline, the first pipeline and the first parallel pipeline, the second pipeline and the second parallel pipeline.

3. The usage method of the heat supply makeup water system for water and energy conservation according to claim 1 or 2, characterized in that It includes the following steps: (a) The hot water generated by the heat source is sent out through the primary network and exchanges heat with the water in the secondary network in the heat exchange station through a heat exchanger. The water in the primary network cools down and is sent back to the heat source for reheating to form a cycle. The water in the secondary network heats up and is sent to users for heating and then cools down to form a cycle; (b) When a leak occurs in the secondary network, it shall be handled as follows: (b1) If other secondary networks need to be replenished with water, open the valve on the second parallel pipeline of the leaking secondary network, so that the water in the leaking secondary network flows back to the sealed water storage tank through the second pressure reducing valve, and start the second water pump on the second pipeline of the secondary network that needs to be replenished to replenish water for this secondary network; (b2) If there is no other secondary network that needs to be replenished with water, open the valve on the second parallel pipeline of the leaking secondary network, so that the water in the leaking secondary network flows back to the sealed water storage tank through the second pressure reducing valve, and start the first water pump on the first pipeline of the primary network to replenish water for the primary network; (c) When the tap water supply pipeline in a certain heat exchange station cannot supply water and the secondary network needs to be replenished with water, open the valve on the first parallel pipeline, so that the water in the primary network enters the sealed water storage tank through the first pressure reducing valve and supplies water to the secondary network that needs to be replenished with water, and use the sealed water storage tanks in other heat exchange stations to replenish water for the primary network; (d) When the primary network needs to be replenished with water, open the first water pump on the first pipeline to replenish water for the primary network; (e) When the secondary network needs to be replenished with water, if the water pressure in the secondary network is lower than the water pressure in the sealed water storage tank, do not start the second water pump but directly use the water pressure in the sealed water storage tank to replenish water for the secondary network. If the water pressure in the secondary network is higher than the water pressure in the sealed water storage tank, start the second water pump to replenish water for the secondary network.

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