Steam heat recovery system

Abstract

The embodiment of the utility model discloses a steam heat recovery system which comprises a water pipeline, a steam supply device, a heat exchange device, a water storage device and a hot water utilization device. The steam supply device is connected with the heat exchange device through a first pipeline, the heat exchange device is connected with the water storage device through a second pipeline, the water storage device is connected with the hot water utilization device through a third pipeline, and the heat exchange device is further connected with a water using pipeline through a fourth pipeline. The water pipeline is connected with the third pipeline through a fifth pipeline; a first valve is arranged on the fifth pipeline, and a second valve is arranged at the upstream end of the connecting point of the third pipeline and the fifth pipeline on the third pipeline; and a first thermometer and a heater are also arranged at the downstream end of the connection point of the third pipeline and the fifth pipeline on the third pipeline. The heat in the steam can be recycled, so that energy waste and economic loss are reduced, and meanwhile, the influence on the environment caused by directly discharging the steam to the air is also reduced.

Description

Technical Field

[0001] This specification belongs to the field of thermoelectricity and energy conservation and environmental protection, specifically a steam heat recovery system. Background Art

[0002] Many industrial processes, such as cogeneration, chemical industry, petrochemical industry, etc., will generate a large amount of steam and heat energy. If the steam is directly discharged into the air, it will cause a waste of energy. Especially in some special cases, such as the emergency shutdown of a heat user with a large amount of steam in the heating process of a thermal power plant, and the unit cannot be adjusted immediately, or because of the need to ensure the minimum flow rate of power generation, it will cause a large amount of excess steam. Excess steam will cause the heating system to overpressure. In order to ensure the safe operation of the system, a large amount of steam must be discharged into the environment. Discharging steam into the air is not only a loss of heat energy in the discharged steam, but also because the steam temperature is very high, it will cause certain harm to the surrounding animals and plants. Therefore, there is an urgent need for a system that can recover steam heat. Utility Model Content

[0003] The embodiments of this specification provide a steam heat recovery system, which can reduce the energy loss caused by direct steam discharge, while also reducing the impact of direct high-temperature steam discharge on the environment.

[0004] The embodiment of this specification provides a steam heat recovery system, which is characterized by comprising a water pipeline, a steam supply device, a heat exchange device, a water storage device, and a hot water utilization device;

[0005] The steam supply device is connected to the heat exchange device through a first pipeline, the heat exchange device is connected to the water storage device through a second pipeline, the water storage device is connected to the hot water utilization device through a third pipeline, the heat exchange device is also connected to the water pipeline through a fourth pipeline, and the water pipeline is connected to the third pipeline through a fifth pipeline;

[0006] The fifth pipeline is provided with a first valve, and the third pipeline is provided with a second valve at an upstream end of a connection point between the third pipeline and the fifth pipeline;

[0007] A first thermometer and a heater are also provided on the downstream end of the third pipeline at the connection point between the third pipeline and the fifth pipeline.

[0008] As a preferred solution, the first thermometer is located at the upstream end of the heater.

[0009] As a preferred solution, the first valve and the second valve are flow regulating valves.

[0010] As a preferred solution, a second thermometer is further provided on the third pipeline at the upstream end of the second valve, and a third thermometer is further provided on the fifth pipeline at the upstream end of the first valve.

[0011] As a preferred solution, a first water level gauge is provided in the water storage device.

[0012] As a preferred solution, a fourth valve is provided on the fourth pipeline, and a fifth valve is provided on the first pipeline.

[0013] As a preferred solution, the heat exchange device includes a heat exchange container, a heat exchange pipe arranged in the heat exchange container, and a steam diffusion pipe located below the heat exchange pipe. The top of the heat exchange container is also provided with a steam exhaust port, and the bottom of the heat exchange container is also provided with a first water outlet;

[0014] The heat exchange pipe comprises a water inlet and a second water outlet, the water inlet is connected to the fourth pipeline, and the second water outlet is connected to the second pipeline;

[0015] The steam diffusion pipe is connected to the first pipeline.

[0016] As a preferred solution, a spray pipe is further provided above the heat exchange pipe in the heat exchange container, and the spray pipe is also connected to the fourth pipeline.

[0017] As a preferred solution, a silencer is provided at the steam exhaust port; and a silencer layer is provided outside the heat exchange pipe.

[0018] As a preferred solution, a second water level gauge is also provided at the bottom of the heat exchange container.

[0019] The beneficial effects brought by the technical solutions provided by some embodiments of this specification include at least:

[0020] The utility model utilizes the steam in the steam supply device to heat the water entering the heat exchange device, and stores the heated water in the water storage device. When the hot water utilization device needs water, the hot water in the water storage device can be directly introduced for use, thereby realizing the recovery of steam heat. Furthermore, considering that the hot water utilization device has different temperature requirements for water, the water temperature is detected by a first thermometer before the water enters the hot water utilization device. When the first thermometer detects that the water temperature is lower than the required temperature, the heater can be turned on to heat the water, and then the water is supplied to the hot water utilization device for use; when the first thermometer detects that the water temperature is higher than the required temperature, the water in the water pipe can be introduced for mixing and cooling, and then the water is supplied to the hot water utilization device for use, thereby increasing the water temperature range of the water supplied to the hot water utilization device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of this specification, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a steam heat recovery system provided in an embodiment of this specification.

[0023] Figure 2 It is a structural schematic diagram of the heat exchange device.

[0024] In the figure: 1, water pipe; 2, steam supply device; 3, heat exchange device; 4, water storage device; 5, hot water utilization device; 6, first pipeline; 7, second pipeline; 8, third pipeline; 9, fourth pipeline; 10, fifth pipeline; 11, first valve; 12, second valve; 13, first thermometer; 14, heater; 15, second thermometer; 16, third thermometer; 17, first water level gauge; 18, fourth valve; 19, fifth valve; 20, heat exchange container; 21, heat exchange pipeline; 22, steam diffusion pipe; 23, steam exhaust port; 24, first water outlet; 25, water inlet; 26, second water outlet; 27, spray pipe; 28, silencer; 29, silencer layer; 30, second water level gauge; DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of this specification will be described clearly and completely below in conjunction with the drawings in the embodiments of this specification.

[0026] The terms "first", "second", "third", etc. in the description and claims of this specification and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0027] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements described without departing from the scope of the present specification. Various processes or components may be appropriately omitted, substituted or added to each example. For example, the described method may be performed in an order different from the order described, and various steps may be added, omitted or combined. In addition, features described with respect to some examples may be combined in other examples.

[0028] See also Figure 1 , Figure 1 A schematic structural diagram of a steam heat recovery system provided in an embodiment of this specification is shown.

[0029] like Figure 1 As shown, the system may at least include a water pipeline 1, a steam supply device 2, a heat exchange device 3, a water storage device 4, and a hot water utilization device 5;

[0030] The steam supply device 2 is connected to the heat exchange device 3 through the first pipeline 6, the heat exchange device 3 is connected to the water storage device 4 through the second pipeline 7, the water storage device 4 is connected to the hot water utilization device 5 through the third pipeline 8, the heat exchange device 3 is also connected to the water pipeline 1 through the fourth pipeline 9, and the water pipeline 1 is connected to the third pipeline 8 through the fifth pipeline 10;

[0031] The fifth pipeline 10 is provided with a first valve 11, and the third pipeline 8 is provided with a second valve 12 at the upstream end of the connection point between the third pipeline 8 and the fifth pipeline 10;

[0032] A first thermometer 13 and a heater 14 are also provided on the downstream end of the third pipeline 8 at the connection point between the third pipeline 8 and the fifth pipeline 10 .

[0033] It can be seen that after the steam in the steam supply device 2 exchanges heat with the water in the water pipe 1 in the heat exchange device 3, the heated water enters the water storage device 4. When the hot water utilization device 5 needs water, the first valve 11 can be closed and the second valve 12 can be opened to allow the water in the water storage device 4 to flow into the hot water utilization device 5 for use; or the first valve 11 and the second valve 12 can be opened at the same time to mix the water in the water storage device 4 with the water in the water pipe 1 and then supply it to the hot water utilization device 5 for use. In order to meet the water temperature use range of the hot water utilization device 5, a first thermometer 13 is also installed on the third pipeline 8 at the downstream end of the connection point between the third pipeline 8 and the fifth pipeline 10. When the water temperature is detected to be low, the heater 14 can be opened to heat the water before use; if the water temperature in the water storage device 4 is too high, the first valve 11 can be opened again to mix the water in the third pipeline 8 and the fifth pipeline 10 to lower the water temperature.

[0034] It can be understood that the water in the water pipe 1 mentioned in this embodiment can be cooling water, demineralized water or other industrial water.

[0035] It is understandable that, considering the complexity of the waterway settings and water use of equipment in actual industrial plants, some changes can be made to the system, such as removing the fourth pipeline 9, connecting the water pipeline 1 to the water storage device 4 through a pipeline, and then connecting the water storage device 4 to the heat exchange device 3 through a pipeline, so that the water in the water storage device 4 can be introduced into the heat exchange device 3 to exchange heat with the steam, and the water after heat exchange can be returned to the water storage device 4. This can also recover the heat energy in the steam, but doing so will cause the water temperature in the water storage device 4 to be relatively high. When the water with higher temperature is introduced into the heat exchange device 3 for heat exchange, the heat exchange effect is not as good as when the heat exchange device 3 is connected to the water pipeline 1 through the fourth pipeline 9.

[0036] See also Figure 1 As shown, in one embodiment of the present specification, the first thermometer 13 is located at the upstream end of the heater 14 .

[0037] It is understandable that in order to meet the water temperature usage range of the hot water utilization device 5, the water needs to be controlled within a certain temperature range before being connected to the hot water utilization device 5 for use, and whether the water needs to be reheated or cold water needs to be added for cooling needs to be detected in advance, so the first thermometer 13 is installed in front of the heater 14, so that it can better judge whether it is necessary to turn on the heater 14 for heating, or to open the first valve 11 at the same time to mix the water in the fifth pipeline 10 and the third pipeline 8 and then supply it to the hot water utilization device 5 for use.

[0038] See also Figure 1 As shown, in one embodiment of the present specification, the first valve 11 and the second valve 12 are flow regulating valves.

[0039] It can be understood that when the water temperature in the water storage device 4 is greater than the water temperature usage range of the hot water utilization device 5, the first valve 11 and the second valve 12 can be opened at the same time, and the water in the third pipeline 8 and the fifth pipeline 10 can be mixed and then supplied to the hot water utilization device 5. The first valve 11 and the second valve 12 can be set as flow regulating valves to adjust the flow of the third pipeline 8 and the fifth pipeline 10 to achieve the effect of meeting the water temperature usage range of the hot water utilization device 5.

[0040] See also Figure 1 As shown, in one embodiment of the present specification, a second thermometer 15 is further provided on the third pipeline 8 at the upstream end of the second valve 12 , and a third thermometer 16 is further provided on the fifth pipeline 10 at the upstream end of the first valve 11 .

[0041] It should be noted that the temperature of the water in the water storage device 4 may just fall within the water temperature usage range of the hot water utilization device 5, or may be higher or lower than the water temperature usage range of the hot water utilization device 5. Therefore, a second thermometer 15 is installed on the third pipeline 8 to measure the water temperature in the water storage device 4 in advance. When the water temperature in the water storage device 4 just falls within the water temperature usage range of the hot water utilization device 5, the second valve 12 can be opened and the first valve 11 can be closed, so that the hot water utilization device 5 can directly use the water in the water storage device 4; when the water temperature in the water storage device 4 is lower than the minimum required temperature of the water used by the hot water utilization device 5, the heater 14 is turned on to heat the water in the third pipeline 8 and then supply it to the hot water utilization device 5 for use; when the water temperature in the water storage device 4 is higher than the maximum required temperature of the water used by the hot water utilization device 5, the first valve 11 and the second valve 12 can be opened at the same time. Preferably, the first valve 11 and the second valve 12 can be set as flow regulating valves, and the water temperatures of the third pipeline 8 and the fifth pipeline 10 are measured by the second thermometer 15 and the third thermometer 16 respectively, and then the optimal ratio of the water supply of the third pipeline 8 and the fifth pipeline 10 is calculated, and then the flow rates of the first valve 11 and the second valve 12 are directly adjusted so that the water in the fifth pipeline 10 and the water in the third pipeline 8 are mixed and just fall within the water temperature usage range of the hot water utilization device 5.

[0042] See also Figure 1 As shown, in one embodiment of the present specification, a first water level gauge 17 is provided in the water storage device 4 .

[0043] It is understandable that if the hot water utilization device 5 does not use water for a long time, it will cause excessive water accumulation in the water storage device 4, or a large amount of water will flow into the water storage device 4 from the heat exchange device 3 in a short period of time, which may also cause too much water in the water storage device 4 to overflow. Therefore, a first water level gauge 17 is installed in the water storage device 4 to discharge the water in time when the water level in the water storage device 4 is too high to prevent water overflow.

[0044] See also Figure 1 As shown, in one embodiment of the present specification, a fourth valve 18 is provided on the fourth pipeline 9 , and a fifth valve 19 is provided on the first pipeline 6 .

[0045] It is understandable that the heat recovery system provided by the utility model may be operated continuously in the factory for heat recovery, or it may be enabled only when an emergency occurs in the factory resulting in excessive steam. For example, during the heating process of a thermal power plant, a heat user with a large amount of steam has an emergency shutdown due to a fault. In order to avoid a large amount of steam being directly discharged into the air, the heat recovery system provided by the utility model is enabled. It can be seen that the heat recovery system provided by the utility model may be suspended in some cases, so a fifth valve 19 is set between the steam supply device 2 and the heat exchange device 3 to block steam from entering the heat exchange device 3; it is understandable that when heat exchange is not required, the heat exchange device 3 naturally does not need external water supply, so a fourth valve 18 is installed on the fourth pipeline 9 to close the water supply of the heat exchange device 3.

[0046] See also Figure 2 As shown, in one embodiment of the present specification, the heat exchange device 3 includes a heat exchange container 20, a heat exchange pipe 21 arranged in the heat exchange container 20, and a steam diffusion pipe 22 located below the heat exchange pipe 21. The top of the heat exchange container 20 is also provided with a steam exhaust port 23, and the bottom of the heat exchange container 20 is also provided with a first water outlet 24;

[0047] The heat exchange pipe 21 includes a water inlet 25 and a second water outlet 26, the water inlet 25 is connected to the fourth pipeline 9, and the second water outlet 26 is connected to the second pipeline 7;

[0048] The steam diffusion pipe 22 is connected to the first pipeline 6 .

[0049] It can be seen that the water in the water pipe 1 is connected to the water inlet 25 of the heat exchange pipe 21 in the heat exchange container 20 through the fourth pipe 9, and flows into the water storage device 4 from the second water outlet 26 after heat exchange with the steam; the steam supply device 2 is connected to the steam diffusion pipe 22 in the heat exchange container 20 through the first pipe 6; because the steam diffusion pipe 22 is located below the heat exchange pipe 21, that is, the steam flows from bottom to top, so the steam and the heat exchange pipe 21 in the heat exchange container 20 can be more fully in contact for heat exchange.

[0050] It should be noted that the heat exchange pipe 21 can be a surface heat exchanger or a shell-and-tube heat exchanger with a coil structure.

[0051] It is understandable that the temperature of the steam is reduced after heat exchange. In order to discharge the remaining low-temperature steam, a steam exhaust port 23 is provided on the top of the heat exchange container 20 .

[0052] It is understandable that the steam diffusion pipe 22 can be a pipe that directly leads into the heat exchange container 20, but in order to make the steam evenly distributed in the heat exchange container 20, so as to achieve a better heat exchange effect. Preferably, the steam diffusion pipe 22 can pass through the center point of the heat exchange container 20 from one end of the heat exchange container 20 to the other end of the heat exchange container 20, and air outlets can be set around the steam diffusion pipe 22 to ensure that the steam is evenly distributed in the heat exchange container 20. The steam diffusion pipe 22 can also be bent into a single or multiple coils in the heat exchange container 20, and air outlets can be set around the steam diffusion pipe 22 to ensure that the steam is evenly distributed in the heat exchange container 20.

[0053] It should be noted that, when the steam encounters the heat exchange pipe 21 with a relatively low temperature, some condensed water will be generated, and therefore a first water outlet 24 is provided at the bottom of the heat exchange container 20 to discharge the condensed water.

[0054] It should be noted that if all the water in the heat exchange container 20 is drained, the steam in the heat exchange container 20 will leak from the first water outlet 24 . Therefore, a U-shaped water seal is provided at the first water outlet 24 to prevent steam from leaking from the first water outlet 24 .

[0055] See also Figure 2 As shown, in one embodiment of the present specification, a spray pipe 27 is further provided above the heat exchange pipe 21 in the heat exchange container 20 , and the spray pipe 27 is also connected to the fourth pipeline 9 .

[0056] It is understandable that, although the temperature of the steam is lowered after heat exchange, the temperature of the steam may still be higher than the air in the external environment, and because the steam humidity is relatively high, white mist is generated when the steam encounters the colder air after being discharged. In order to eliminate the impact of the white mist on the environment, a spray pipe 27 can be set above the heat exchange pipe 21 in the heat exchange container 20 to reduce the temperature and humidity of the steam to achieve the purpose of eliminating the white mist. In addition, a video monitoring device can be set at the steam exhaust port 23 to monitor the effect of eliminating the white mist in real time. When white mist appears at the steam exhaust port 23, the spraying amount is increased to further reduce the temperature and humidity of the steam.

[0057] See also Figure 2 As shown, in one embodiment of the present specification, a silencer 28 is provided at the steam exhaust port 23 ; and a silencer layer 29 is provided outside the heat exchange pipe 21 .

[0058] It is understandable that the steam exhaust process will generate noise, so a silencer 28 is set at the steam exhaust port 23, such as setting glass wool and other sound-absorbing materials at the steam exhaust port 23, or installing a silencer, etc.; in order to further eliminate the impact of noise, a sound-absorbing layer 29 can also be wrapped around the heat exchange pipe 21 to achieve a better sound-absorbing effect.

[0059] See also Figure 2 As shown, in one embodiment of the present specification, a second water level gauge 30 is further provided at the bottom of the heat exchange container 20 .

[0060] It is understandable that a large amount of water will accumulate in the heat exchange container 20 due to the condensation water and spraying water generated during the heat exchange process. In order to prevent the water level in the heat exchange container 20 from being too high, such as exceeding the height of the steam diffusion tube 22, which will affect the heat exchange effect, a second water level gauge 30 is provided at the bottom of the heat exchange container 20 to monitor the water level in real time and drain the water in time when the water level is too high.

[0061] The embodiments described above are merely preferred embodiments of this specification and are not intended to limit the scope of this specification. Without departing from the design spirit of this specification, various modifications and improvements made to the technical solutions of this specification by ordinary technicians in this field should fall within the scope of protection determined by the claims of this specification.

Claims

1. A steam heat recovery system, characterized in that: Including water pipes, steam supply devices, heat exchange devices, water storage devices, and hot water utilization devices; The steam supply device is connected to the heat exchange device through a first pipeline, the heat exchange device is connected to the water storage device through a second pipeline, the water storage device is connected to the hot water utilization device through a third pipeline, the heat exchange device is also connected to the water pipeline through a fourth pipeline, and the water pipeline is connected to the third pipeline through a fifth pipeline; The fifth pipeline is provided with a first valve, and the third pipeline is provided with a second valve at an upstream end of a connection point between the third pipeline and the fifth pipeline; A first thermometer and a heater are also provided on the downstream end of the third pipeline at the connection point between the third pipeline and the fifth pipeline.

2. A steam heat recovery system according to claim 1, characterized in that: The first thermometer is located at the upstream end of the heater.

3. A steam heat recovery system according to claim 1, characterized in that: The first valve and the second valve are flow regulating valves.

4. A steam heat recovery system according to claim 1, characterized in that: A second thermometer is also provided on the third pipeline at the upstream end of the second valve, and a third thermometer is also provided on the fifth pipeline at the upstream end of the first valve.

5. The steam heat recovery system according to claim 1, characterized in that: A first water level gauge is arranged in the water storage device.

6. A steam heat recovery system according to claim 1, characterized in that: The fourth pipeline is provided with a fourth valve, and the first pipeline is provided with a fifth valve.

7. The steam heat recovery system according to claim 1, characterized in that: The heat exchange device comprises a heat exchange container, a heat exchange pipe arranged in the heat exchange container and a steam diffusion pipe located below the heat exchange pipe, the top of the heat exchange container is also provided with a steam exhaust port, and the bottom of the heat exchange container is also provided with a first water outlet; The heat exchange pipe comprises a water inlet and a second water outlet, the water inlet is connected to the fourth pipeline, and the second water outlet is connected to the second pipeline; The steam diffusion pipe is connected to the first pipeline.

8. A steam heat recovery system according to claim 7, characterized in that: A spray pipe is also provided above the heat exchange pipe in the heat exchange container, and the spray pipe is also connected to the fourth pipeline.

9. A steam heat recovery system according to claim 7, characterized in that: The steam exhaust port is provided with a silencer; the heat exchange pipe is wrapped with a silencer layer.

10. A steam heat recovery system according to claim 7, characterized in that: A second water level gauge is also provided at the bottom of the heat exchange container.

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