A winter-summer dual-purpose energy-saving system for air-cooled units

Abstract

The utility model discloses a winter summer dual -purpose energy -conserving system for air cooling unit, including heat supply network system and air cooling system, heat supply network system includes steam turbine and heat supply network heat exchanger, and air cooling system is air cooling island, steam turbine includes steam turbine medium pressure cylinder and steam turbine low pressure cylinder, and steam turbine medium pressure cylinder communicates with heat exchange medium first inlet, and steam turbine low pressure cylinder respectively links up heat exchange medium second inlet, and air cooling island, and heat exchange medium first drain interface and heat exchange medium second drain interface are set up respectively on heat supply network heat exchanger, and heat exchange medium first drain interface and heat exchange medium second drain interface converge to hot well inlet, heat supply network circulating backwater water inlet and heat supply network circulating water supply water inlet are set up respectively on heat supply network heat exchanger. The utility model discloses in the high temperature period of summer, utilize the idle heat supply network heat exchanger as the peak cooler of air cooling unit, can effectively reduce the back pressure of air cooling unit, thereby improves unit efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of heating network energy-saving system, specifically relating to an energy-saving system for air-cooled units that can be used not only in winter but also in summer, achieving the dual-use function of winter and summer. Background Technology

[0002] A heating network system refers to a system that uses steam extracted from a steam turbine to heat the circulating water of the heating network, and then uses this circulating water to provide heating to residents. Because it uses lower-quality heat energy for heating, the unit is relatively economical. Currently, this system is characterized by long periods of downtime during the non-heating season and low equipment utilization. Utility Model Content

[0003] The purpose of this invention is to address the low equipment utilization rate of heating network systems during the non-heating season by combining it with an air-cooled system to provide a dual-use energy-saving system for air-cooled units, suitable for both winter and summer. In summer, the system utilizes the circulating water from the heating network to cool the exhaust steam in the air-cooled island, reducing turbine back pressure and thus improving unit efficiency. The heat exchanger in this invention features small-diameter and large-diameter inlets for the first and second heat exchange medium inlets, respectively, and large-diameter and small-diameter drain ports for the first and second heat exchange medium outlets, respectively. This design adapts to both winter and summer heating network operation and peak cooling operation, improving equipment utilization and efficiency.

[0004] The objective of this utility model is achieved through the following technical solution: A dual-use (winter and summer) energy-saving system for air-cooled units includes a heating network system and an air-cooling system. The heating network system includes a steam turbine and a heating network heat exchanger, and the air-cooling system includes an air-cooling island. The steam turbine includes an intermediate-pressure cylinder and a low-pressure cylinder. The intermediate-pressure cylinder is connected to the first inlet of the heat exchange medium of the heating network heat exchanger via a first pipeline. A quick-closing extraction valve, an extraction regulating valve, and a heat exchanger shut-off valve are sequentially installed on the first pipeline from the intermediate-pressure cylinder to the heat exchanger. The low-pressure cylinder is connected to a third pipeline. One end of a second pipeline is connected to the third pipeline, and the other end of the second pipeline is connected to the second inlet of the heat exchange medium of the heating network heat exchanger. A second pipeline is connected before the second inlet of the heat exchange medium. A heat exchanger is equipped with a heat network vacuum shut-off valve. A third pipe connects to the air-cooled island. The diameter of the first inlet of the heat exchange medium is smaller than the diameter of the second inlet of the heat exchange medium. The heat exchanger is also equipped with a first drain port and a second drain port for the heat exchange medium. The first drain port connects to the inlet of the hot well via a fourth pipe, on which a drain shut-off valve is installed. The second drain port connects to the inlet of the hot well via a fifth pipe, on which a drain vacuum shut-off valve is installed. The heat exchanger is also equipped with a heat network circulation return water inlet and a heat network circulation supply water inlet. The diameter of the first drain port is larger than the diameter of the second drain port.

[0005] The aforementioned energy-saving system for air-cooled units, which is suitable for both winter and summer use, also includes an extraction steam check valve installed on the first pipeline between the extraction steam quick-closing valve and the extraction steam check valve.

[0006] The aforementioned energy-saving system for air-cooled units, which operates in both winter and summer, connects the low-pressure cylinder of the steam turbine to the second inlet of the heat exchange medium of the heat network heat exchanger via a third pipe and a second pipe.

[0007] In the above-mentioned energy-saving system for air-cooled units that can be used in both winter and summer, the heat network circulation return water inlet is located at the bottom of the heat network heat exchanger, and the heat network circulation supply water inlet is located at the top of the heat network heat exchanger.

[0008] The aforementioned energy-saving system for air-cooled units, which is suitable for both winter and summer use, also includes a first drain regulating valve on the fourth pipe. The first drain regulating valve is installed at the rear end of the drain shut-off valve.

[0009] The aforementioned energy-saving system for air-cooled units, which is suitable for both winter and summer use, also includes a second drain regulating valve on the fifth pipe. The second drain regulating valve is installed at the rear end of the drain vacuum shut-off valve.

[0010] The aforementioned energy-saving system for air-cooled units, which is suitable for both winter and summer use, connects the low-pressure cylinder of the steam turbine to a third pipeline via an air-cooled exhaust device.

[0011] Compared with the prior art, the present invention has the following technical effects: In the winter heating season, this invention provides heating steam drawn from the extraction port of the turbine's intermediate-pressure cylinder, passing sequentially through an extraction check valve, an extraction quick-closing valve, an extraction regulating valve, and a heat exchanger shut-off valve before entering the heat exchanger of the heating network. Drainage from the steam flows into the inlet of the hot well. The heated circulating water of the heating network is then pumped to the outside for external heating. This system improves heating efficiency by utilizing low-grade energy (extraction steam from the turbine after it has performed work) instead of a small boiler for heating. In summer, due to higher temperatures, the air-cooled unit's cooling effect is poor, causing increased turbine back pressure and higher coal consumption. This system connects to the air-cooling system, allowing a third pipe (exhaust steam pipe) to be drawn from the air-cooled exhaust device (i.e., the air-cooled exhaust pipe) connected to the turbine's low-pressure cylinder during periods of higher temperatures. This pipe passes through a vacuum shut-off valve into the heat exchanger of the heating network, and exhaust steam drainage flows from the small-diameter second drain port of the heat exchanger into the inlet of the hot well.

[0012] This invention employs a normal steam inlet (small-diameter first inlet for heat exchange medium) and a large-diameter first condensate drain inlet for heat exchange medium use in winter. In summer use, due to the low pressure and high specific volume of the exhaust steam, a large steam inlet (large-diameter second inlet for heat exchange medium) is used to increase equipment output. Because the exhaust steam condensate flow is small, a small-diameter second condensate drain inlet is used for precise adjustment of the heat exchanger in the heating network. This invention features a simple system, flexible and convenient operation, improves the utilization rate of heating network equipment, and enhances the summer power generation efficiency of air-cooled units, thus possessing high value.

[0013] The technical effect of this utility model is that during the high-temperature period in summer, using the idle heat exchanger of the heat network as the peak cooler of the air-cooled unit can effectively reduce the back pressure of the air-cooled unit, thereby improving the unit efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the heat exchanger for the heat network of this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the appendices of the embodiments of this utility model. Figure 1-2 The technical solutions in the embodiments of this utility model will be clearly and completely described.

[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] like Figure 1-2As shown, a dual-use (winter and summer) energy-saving system for air-cooled units includes a heating network system and an air-cooling system. The heating network system includes a steam turbine and a heating network heat exchanger, and the air-cooling system includes an air-cooling island. The steam turbine includes an intermediate-pressure cylinder 12 and a low-pressure cylinder 23. The intermediate-pressure cylinder is connected to the first inlet 6 of the heat exchange medium of the heating network heat exchanger via a first pipe 1. A quick-closing extraction valve 14, an extraction regulating valve 15, and a heat exchanger shut-off valve 16 are sequentially installed on the first pipe 1 from the intermediate-pressure cylinder to the heat exchanger. The low-pressure cylinder 23 is connected to a third pipe 3. One end of a second pipe 2 is connected to the third pipe 3, and the other end of the second pipe 2 is connected to the second inlet 7 of the heat exchange medium of the heating network heat exchanger. A second pipe is connected before the second inlet of the heat exchange medium... A heat network vacuum shut-off valve 17 is installed on the pipeline, and a third pipeline 3 connects to the air-cooled island. The diameter of the first inlet 6 of the heat exchange medium is smaller than the diameter of the second inlet of the heat exchange medium. A first drain port 8 and a second drain port 9 of the heat exchange medium are also installed on the heat network heat exchanger. The first drain port 8 of the heat exchange medium flows into the inlet of the hot well through a fourth pipeline 4. A drain shut-off valve 19 is installed on the fourth pipeline. The second drain port 9 of the heat exchange medium flows into the inlet of the hot well through a fifth pipeline 5. A drain vacuum shut-off valve 21 is installed on the fifth pipeline. A heat network circulation return water inlet 10 and a heat network circulation supply water inlet 11 are installed on the heat network heat exchanger. The diameter of the first drain port 8 of the heat exchange medium is larger than the diameter of the second drain port 9 of the heat exchange medium.

[0019] The energy-saving system for air-cooled units described in this utility model, which is suitable for both winter and summer use, also includes an extraction steam check valve 13 installed on the first pipeline 1 between the extraction steam quick-closing valve 14.

[0020] The energy-saving system for air-cooled units described in this utility model, which is suitable for both winter and summer use, connects the low-pressure cylinder 23 of the steam turbine to the second inlet of the heat exchange medium of the heat exchanger via a third pipe and a second pipe.

[0021] The energy-saving system for air-cooled units that can be used in both winter and summer as described in this utility model has the heat network circulation return water inlet located at the bottom of the heat network heat exchanger, and the heat network circulation supply water inlet located at the top of the heat network heat exchanger.

[0022] The energy-saving system for air-cooled units described in this utility model, which is suitable for both winter and summer use, also includes a first drain regulating valve 20 installed on the fourth pipe. The first drain regulating valve is installed at the rear end of the drain shut-off valve.

[0023] The energy-saving system for air-cooled units described in this utility model, which is suitable for both winter and summer use, also includes a second drain regulating valve 22 installed on the fifth pipe. The second drain regulating valve is installed at the rear end of the drain vacuum shut-off valve.

[0024] The energy-saving system for air-cooled units described in this utility model, which operates in both winter and summer, connects the low-pressure cylinder of the steam turbine to the third pipe 3 via an air-cooled exhaust device 24. The air-cooled exhaust device of this utility model can be an existing air-cooled exhaust device or can be directly replaced by an air-cooled exhaust pipe.

[0025] The working process of this utility model is as follows: As attached Figure 1 As shown, the usage method of the dual-use energy-saving system for winter and summer is as follows: 1. During the winter heating season, the extraction steam check valve, extraction steam quick-closing valve, extraction steam regulating valve, heat exchanger shut-off valve, condensate shut-off valve, and first condensate regulating valve are opened, while the heating network vacuum shut-off valve, condensate vacuum shut-off valve, and second condensate regulating valve are closed.

[0026] Heating steam is drawn from the extraction port of the intermediate pressure cylinder of the steam turbine, and passes through the extraction steam check valve, extraction steam quick-closing valve, extraction steam regulating valve, and heat exchanger shut-off valve in sequence before entering the heat exchanger of the heating network. Drainage flows through the first drainage interface of the heat exchange medium, through the drainage shut-off valve and the first drainage regulating valve, and into the inlet of the hot well. The heated heating network circulating water is transported to the outside for external heating by the heating network circulating water pump connected to the heating network circulating water supply inlet.

[0027] 2. In summer, the heating network vacuum shut-off valve, the condensate vacuum shut-off valve, and the second condensate regulating valve are opened, while the extraction steam check valve, the extraction steam quick-closing valve, the extraction steam regulating valve, the heat exchanger shut-off valve, the condensate shut-off valve, and the first condensate regulating valve are closed.

[0028] The steam turbine's low-pressure cylinder has a third exhaust steam pipe (a branch line) extending from the air-cooled exhaust pipe into the air-cooled island. Part of this pipe flows through the heat network vacuum shut-off valve into the heat network heat exchanger. Exhaust steam condensate flows from the small-diameter second condensate inlet of the heat exchanger through the condensate vacuum shut-off valve and the second condensate regulating valve, finally converging into the hot well inlet. This system effectively reduces the unit's back pressure in summer, thus achieving energy savings.

[0029] As attached Figure 2As shown, the heat exchanger of this utility model includes a heat exchanger shell, heat exchange tubes, a first inlet for heat exchange medium, a second inlet for heat exchange medium, a first drain port for heat exchange medium, and a second drain port for heat exchange medium. Heat exchange tubes are installed inside the heat exchanger shell, and a circulating water cavity is formed between the heat exchange tubes and the heat exchanger shell. The first inlet for heat exchange medium, the second inlet for heat exchange medium, the first drain port for heat exchange medium, and the second drain port for heat exchange medium are respectively connected to the heat exchange tubes. A heat network circulating water supply inlet and a heat network circulating water return inlet are provided on the heat exchanger shell. The heater's structural feature is that, compared to conventional heat exchangers, it has a larger-diameter second inlet for the heat exchange medium used for air-cooled exhaust steam at the upper part of the shell, and a smaller-diameter second drain port for the heat exchange medium at the lower part of the shell. During winter use, the heat exchanger uses the normal first inlet and first drain port for the heat exchange medium. In summer, when used as a peak cooler, due to the large specific volume of the exhaust steam, the exhaust steam is introduced through the larger-diameter second inlet to increase the steam flow rate. Drainage is discharged through the smaller-diameter second drain port at the lower part. Because the exhaust steam drainage volume is small, a separate exhaust steam drain pipe connected to the second drain port allows for precise control of the water level in the heat exchanger.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A dual-use (winter and summer) energy-saving system for air-cooled units, characterized in that: The system includes a heating network system and an air-cooled system. The heating network system includes a steam turbine and a heating network heat exchanger. The air-cooled system includes an air-cooled island. The steam turbine includes a steam turbine intermediate-pressure cylinder (12) and a steam turbine low-pressure cylinder (23). The steam turbine intermediate-pressure cylinder is connected to the first inlet (6) of the heat exchange medium of the heating network heat exchanger through a first pipeline (1). On the first pipeline (1), from the steam turbine intermediate-pressure cylinder to the heating network heat exchanger, a steam extraction quick-closing valve (14), a steam extraction regulating valve (15), and a heat exchanger shut-off valve (16) are installed in sequence. The steam turbine low-pressure cylinder (23) is connected to a third pipeline (3). One end of the second pipeline (2) is connected to the third pipeline (3), and the other end of the second pipeline (2) is connected to the second inlet (7) of the heat exchange medium of the heating network heat exchanger. A heating network vacuum shut-off valve is installed on the second pipeline before the second inlet of the heat exchange medium. (17) The third pipe (3) is connected to the air-cooled island. The diameter of the first inlet (6) of the heat exchange medium is smaller than the diameter of the second inlet of the heat exchange medium. The heat exchanger is also provided with a first drain port (8) and a second drain port (9) of the heat exchange medium. The first drain port (8) of the heat exchange medium flows into the hot well inlet through the fourth pipe (4). A drain shut-off valve (19) is provided on the fourth pipe. The second drain port (9) of the heat exchange medium flows into the hot well inlet through the fifth pipe (5). A drain vacuum shut-off valve (21) is provided on the fifth pipe. The heat exchanger is provided with a heat network circulation return water inlet (10) and a heat network circulation supply water inlet (11). The diameter of the first drain port (8) of the heat exchange medium is larger than the diameter of the second drain port (9) of the heat exchange medium.

2. The energy-saving system for air-cooled units that can be used in both winter and summer according to claim 1, characterized in that: A steam extraction check valve (13) is also installed on the first pipeline (1) between the steam extraction quick-closing valve (14).

3. The energy-saving system for air-cooled units, applicable in both winter and summer, as described in claim 1, is characterized in that: The low-pressure cylinder of the steam turbine is connected to the second inlet of the heat exchange medium of the heat network heat exchanger through the third and second pipes.

4. The energy-saving system for air-cooled units that can be used in both winter and summer according to claim 1, characterized in that: The heat network circulation return water inlet is located at the bottom of the heat network heat exchanger, and the heat network circulation supply water inlet is located at the top of the heat network heat exchanger.

5. The energy-saving system for air-cooled units for both winter and summer use according to claim 1, characterized in that: A first drain regulating valve (20) is also installed on the fourth pipeline. The first drain regulating valve is installed at the rear end of the drain shut-off valve.

6. The energy-saving system for air-cooled units for both winter and summer use according to claim 1, characterized in that: A second condensate regulating valve (22) is also installed on the fifth pipeline. The second condensate regulating valve is installed at the rear end of the condensate vacuum shut-off valve.

7. The energy-saving system for air-cooled units, applicable in both winter and summer, as described in claim 1, is characterized in that: The low-pressure cylinder of the steam turbine is connected to the third pipeline through an air-cooled exhaust device (24).

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