Hot water system and flue gas waste heat recovery device

Abstract

The utility model relates to a hot water system and a flue gas waste heat recovery device.The hot water system comprises at least two hot water tanks and a fresh air heating device, each hot water tank is provided with a water outlet pipe for discharging water, and the water outlet pipe is provided with a first control valve with the opening degree adjustable to control the water outlet amount of the water outlet pipe; a liquid level sensor is arranged in each hot water tank, the first control valve is electrically connected with the signal output end of the liquid level sensor and is configured to adjust the water yield of the water outlet pipe after receiving a detection signal of the liquid level sensor, each water outlet pipe communicates with an inlet of the fresh air heating device through a connecting pipe, and a first water pump is arranged on the connecting pipe; an outlet of the fresh air heating device communicates with the hot water tank through a water return pipe. And each hot water tank can control the water volume to be within a proper range through the cooperation of the liquid level sensor and the first control valve, so that water balance in each hot water tank is favorably maintained, the water content and temperature of fresh air are stable, and stable operation of the boiler is favorably ensured.

Description

Technical Field

[0001] This application relates to the technical field of flue gas waste heat recovery and circulation devices, and in particular to a hot water system and a flue gas waste heat recovery device. Background Technology

[0002] The boiler flue gas waste heat recovery and circulation device stores the spray water recovered from the flue gas waste heat in multiple series-connected hot water tanks. These tanks are connected by a balancing pipe, and the water from the series-connected tanks ultimately flows through an outlet pipe to a fresh air heating device under the action of a water pump, to heat the fresh air within the device.

[0003] Because the hot water tank closer to the water pump has a larger water output, it is more likely to be evacuated. At this time, air will enter the water outlet pipe, the water balance will be broken, and the water pump will lose pressure instantly. The water content and temperature in the fresh air will fluctuate abnormally, thus affecting the stable operation of the boiler. Utility Model Content

[0004] Therefore, it is necessary to provide a hot water system that maintains the water balance in each hot water tank.

[0005] This application provides a hot water system, including a hot water tank and a fresh air heating device. There are at least two hot water tanks connected sequentially. Each hot water tank has an inlet for flue gas and an outlet pipe for water discharge. The outlet pipe is equipped with a first control valve whose opening is adjustable to control the water flow rate. Each hot water tank is equipped with a level sensor. The first control valve is electrically connected to the signal output terminal of the level sensor and is configured to adjust the water flow rate of the outlet pipe upon receiving a detection signal from the level sensor. Each outlet pipe is connected to the inlet of the fresh air heating device via a connecting pipe, and a first water pump is installed on the connecting pipe. The outlet of the fresh air heating device is connected to the hot water tank via a return water pipe.

[0006] In one embodiment, the connecting pipe includes a first pipe segment and a second pipe segment connected sequentially along the water flow path. The first pipe segment is located below the hot water tank, the second pipe segment is arranged vertically, and the lower end of the second pipe segment is connected to the end of the first pipe segment.

[0007] In one embodiment, the connecting pipe is provided with a pressure sensor for detecting the pressure inside the connecting pipe.

[0008] In one embodiment, the pressure sensor is located between the first water pump and the fresh air heating device, along the fluid flow path within the connecting pipe.

[0009] In one embodiment, both the first water pump and the pressure sensor are located on the first pipe section.

[0010] In one embodiment, a second water pump is provided on the return water pipe.

[0011] In one embodiment, a drain pipe is provided on the return water pipe, and each hot water tank has a corresponding drain pipe. A second control valve is provided on the drain pipe to open and close the drain pipe, and the signal output terminal of the liquid level sensor is electrically connected to the second control valve.

[0012] In one embodiment, the return pipe includes a vertical pipe section and a horizontal pipe section connected sequentially along the water flow path. The vertical pipe section is arranged vertically, the horizontal pipe section is located above the hot water tank, and the drain pipe is disposed on the horizontal pipe section.

[0013] In one embodiment, the vertical projection of the drain pipe is located inside the corresponding hot water tank.

[0014] In one embodiment, the hot water tanks are arranged sequentially along a first direction, the horizontal pipe section extends along the first direction, and the drain pipes are arranged at intervals along the first direction.

[0015] This application also discloses a flue gas waste heat recovery device, including the hot water system described in any of the above embodiments.

[0016] Compared with existing technologies, in the hot water system provided in this application, when the level sensor detects that the corresponding hot water tank is at a high level, it transmits an instruction to increase the flow rate to the first control valve. The opening of the first control valve increases, and the water output from the hot water tank increases. When the level sensor detects that the water level in the corresponding hot water tank is between a low level and a high level, the level sensor transmits instructions to increase or decrease the flow rate to the first control valve according to the rising or falling trend of the water level. The first control valve automatically adjusts its opening, thereby controlling the water output of the hot water tank. When the level sensor detects that the water level in the hot water tank is at a low level, it transmits an instruction to stop the water output to the first control valve. The first control valve closes the water outlet pipe. That is, through the cooperation of the level sensor and the first control valve, the water output of each hot water tank can be controlled within a suitable range, which helps to maintain the water balance in each hot water tank, ensures the stability of the fresh air moisture content and temperature, and thus helps to ensure the stable operation of the boiler. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a hot water system according to an embodiment of this application.

[0019] Reference numerals: 1. Hot water tank; 11. Outlet pipe; 111. Horizontal section; 112. Vertical section; 12. Liquid level sensor; 13. First control valve; 2. Fresh air heating device; 3. Connecting pipe; 31. First pipe section; 32. Second pipe section; 4. Return water pipe; 41. Vertical pipe section; 42. Horizontal pipe section; 43. Drain pipe; 44. Second control valve; 5. Pressure sensor; 6. First water pump; 7. Second water pump. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "side," "top," "bottom," and similar expressions used in this application's specification are merely for describing various exemplary structural parts and elements of this application. However, their use herein is for illustrative purposes only and is determined based on the exemplary orientations shown in the accompanying drawings, and does not represent the only possible implementation. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating orientation are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may be at an angle to the axial direction.

[0025] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0026] like Figure 1 As shown, this application discloses a hot water system. The hot water system includes a hot water tank 1 and a fresh air heating device 2. There are at least two hot water tanks 1 connected sequentially; schematically, there may be two, three, or more hot water tanks 1. In this embodiment, there are three hot water tanks 1.

[0027] The waste heat from the flue gas is transferred to the hot water tank 1. Each hot water tank 1 has a water outlet pipe 11. The water outlet pipe 11 is equipped with a first control valve 13 with an adjustable opening to control the water output of the water outlet pipe 11. In other words, the first control valve 13 can control the opening and closing of the water outlet pipe 11, and can also adjust the water output of the water outlet pipe 11 by adjusting the opening size.

[0028] Each of the aforementioned hot water tanks 1 is equipped with a liquid level sensor 12. A first control valve 13 is electrically connected to the signal output terminal of the liquid level sensor 12 and is configured to adjust the water flow rate of the outlet pipe 11 upon receiving a detection signal from the liquid level sensor 12. Each outlet pipe 11 is connected to the inlet of the fresh air heating device 2 via a connecting pipe 3. A first water pump 6 is installed on the connecting pipe 3. The outlet of the fresh air heating device 2 is connected to the hot water tank 1 via a return water pipe 4. In other words, the hot water entering the fresh air heating device 2 through the connecting pipe 3 heats the fresh air within the device. The return water pipe 4 can supply water to the hot water tanks 1, thereby helping to maintain the water balance within each hot water tank 1.

[0029] Understandably, when the level sensor 12 detects that the corresponding hot water tank 1 is at a high level, it sends a command to the first control valve 13 to increase the flow rate. The opening of the first control valve 13 increases, and the water output from the hot water tank 1 increases. When the level sensor 12 detects that the water level in the corresponding hot water tank 1 is between a low level and a high level, the level sensor 12 sends a command to the first control valve 13 to increase or decrease the flow rate according to the rising or falling trend of the water level. The first control valve automatically adjusts its opening to control the water output from the hot water tank 1. When the level sensor 12 detects that the water level in the hot water tank 1 is at a low level, it sends a command to the first control valve 13 to stop the water output. The first control valve 13 then closes the water outlet pipe 11.

[0030] Since the water volume of each hot water tank 1 can be controlled within a suitable range through the cooperation of the liquid level sensor 12 and the first control valve 13, it is beneficial to maintain the water balance in each hot water tank 1, ensure the stability of the fresh air moisture content and temperature, and thus help ensure the stable operation of the boiler.

[0031] Furthermore, the aforementioned connecting pipe 3 includes a first pipe section 31 and a second pipe section 32 connected sequentially along the water flow path. The first pipe section 31 is located below the hot water tank 1, and the second pipe section 32 is arranged vertically, with its lower end connected to the end of the first pipe section 31. Alternatively, the connecting pipe 3 can also be configured such that a connecting pipe section 3 is installed between the first pipe section 31 and the second pipe section 32.

[0032] The water outlet pipe 11 and the liquid level sensor 12 on the hot water tank 1 are located on opposite side walls of the hot water tank 1, that is, the water outlet pipe 11 and the liquid level sensor 12 on the hot water tank 1 are arranged opposite each other.

[0033] In this embodiment, the water outlet pipe 11 includes a horizontal section 111 and a vertically arranged vertical section 112. One end of the horizontal section 111 is connected to the hot water tank 1, and the other end of the horizontal section 111 is connected to the upper end of the vertical section 112. The lower end of the vertical section 112 is located below the hot water tank 1 and is connected to the first pipe section 31. The aforementioned first control valve 13 is disposed on the horizontal section 111.

[0034] In addition, a pressure sensor 5 is installed on the connecting pipe 3 to detect the pressure inside the connecting pipe 3. The presence of the pressure sensor 5 can detect changes in water pressure inside the connecting pipe 3, ensuring stable water pressure inside the connecting pipe 3, and at the same time reducing the energy consumption of the water pump. In this embodiment, both the first water pump 6 and the pressure sensor 5 are located on the first pipe section 31. And along the fluid flow path inside the connecting pipe 3, the pressure sensor 5 is located between the first water pump 6 and the fresh air heating device 2.

[0035] A second water pump 7 is installed on the aforementioned return water pipe 4. In this embodiment, a drain pipe 43 is installed on the return water pipe 4, and each hot water tank 1 has a corresponding drain pipe 43. A second control valve 44 is installed on the drain pipe 43 to open and close the drain pipe 43, and the signal output terminal of the liquid level sensor 12 is electrically connected to the second control valve 44.

[0036] Understandably, when the level sensor 12 detects that the liquid level in the hot water tank 1 is higher than the set maximum level, the level sensor 12 sends a command to the first control valve 13 to increase the flow rate, and the first control valve 13 on the outlet pipe 11 opens. When the level sensor 12 detects that the liquid level in the hot water tank 1 is between the set minimum and maximum levels, the level sensor 12 sends a command to the first control valve 13 to decrease the flow rate, and the first control valve 13 on the outlet pipe 11 automatically reduces its opening. When the level sensor 12 detects that the liquid level in the hot water tank 1 is lower than the minimum set level, the level sensor 12 sends a command to the first control valve 13 to stop water supply, and the first control valve 13 on the outlet pipe 11 closes. Water can then be replenished to the hot water tank 1 through the return pipe 4 by opening the second control valve 44. Through the cooperation of the level sensor 12 and the first control valve 13, the liquid level in the hot water tank 1 can be kept within a reasonable range even when the second control valve 44 is not open, which is beneficial to the stable operation of the first water pump 6.

[0037] Both the first control valve 13 and the second control valve 44 mentioned above are electrically controlled valves.

[0038] Specifically, the return pipe 4 includes a vertical pipe section 41 and a horizontal pipe section 42 connected sequentially along the water flow path. The vertical pipe section 41 is arranged vertically, and the horizontal pipe section 42 is located above the hot water tank 1. The drain pipe 43 is disposed on the horizontal pipe section 42. In this embodiment, the vertical projection of the drain pipe 43 is located inside the corresponding hot water tank 1. In this way, water is reliably replenished to the corresponding hot water tank 1 through the drain pipe 43.

[0039] like Figure 1 As shown, the hot water tanks 1 are arranged sequentially along the first direction A, the horizontal pipe section 42 extends along the first direction A, and the drain pipes 43 are arranged at intervals along the first direction A. This arrangement of the horizontal pipe section 42 is more reasonable and reliably achieves the purpose of replenishing water to the hot water tanks 1. Furthermore, the first pipe section 31 of the connecting pipe 3 also extends along the first direction A, which facilitates connection with each outlet pipe 11.

[0040] This application also provides a flue gas waste heat recovery device, which includes the aforementioned hot water system.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A hot water system, characterized in that, The device includes a hot water tank (1) and a fresh air heating device (2). There are at least two hot water tanks (1) connected in sequence. Each hot water tank (1) has a water outlet pipe (11) for water supply and discharge. The water outlet pipe (11) is equipped with a first control valve (13) with an adjustable opening to control the water flow of the water outlet pipe (11). Each hot water tank (1) is equipped with a liquid level sensor (12). The first control valve (13) is electrically connected to the signal output terminal of the liquid level sensor (12) and is configured to adjust the water flow of the water outlet pipe (11) after receiving the detection signal from the liquid level sensor (12). Each water outlet pipe (11) is connected to the inlet of the fresh air heating device (2) through a connecting pipe (3). A first water pump (6) is installed on the connecting pipe (3). The outlet of the fresh air heating device (2) is connected to the hot water tank (1) through a return water pipe (4).

2. The hot water system according to claim 1, characterized in that, The connecting pipe (3) includes a first pipe section (31) and a second pipe section (32) connected sequentially along the water flow path. The first pipe section (31) is located below the hot water tank (1), and the second pipe section (32) is arranged vertically, with the lower end of the second pipe section (32) connected to the end of the first pipe section (31).

3. The hot water system according to claim 2, characterized in that, A pressure sensor (5) for detecting the pressure inside the connecting pipe (3) is provided on the connecting pipe (3).

4. The hot water system according to claim 3, characterized in that, Along the fluid flow path inside the connecting pipe (3), the pressure sensor (5) is located between the first water pump (6) and the fresh air heating device (2).

5. The hot water system according to claim 4, characterized in that, The first water pump (6) and the pressure sensor (5) are both located on the first pipe section (31).

6. The hot water system according to claim 1, characterized in that, A second water pump (7) is installed on the return water pipe (4).

7. The hot water system according to any one of claims 1 to 6, characterized in that, A drain pipe (43) is provided on the return water pipe (4), and each hot water tank (1) has a corresponding drain pipe (43). A second control valve (44) for opening and closing the drain pipe (43) is provided on the drain pipe (43), and the signal output terminal of the liquid level sensor (12) is electrically connected to the second control valve (44).

8. The hot water system according to claim 7, characterized in that, The return water pipe (4) includes a vertical pipe section (41) and a horizontal pipe section (42) connected sequentially along the water flow path. The vertical pipe section (41) is arranged vertically, the horizontal pipe section (42) is located above the hot water tank (1), and the drain pipe (43) is installed on the horizontal pipe section (42).

9. The hot water system according to claim 8, characterized in that, Each of the hot water tanks (1) is arranged sequentially along the first direction (A), the horizontal pipe section (42) extends along the first direction (A), and each of the drain pipes (43) is arranged at intervals along the first direction (A).

10. A flue gas waste heat recovery device, characterized in that, The hot water system includes any one of claims 1 to 9.

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