Waste heat recovery device for industrial waste gas

Abstract

The embodiment of the utility model provides a waste heat recovery device for industrial waste gas, and belongs to the technical field of waste gas treatment. The waste heat recovery device comprises a shell with a first end and a second end, the first end is provided with a waste gas inlet and a fresh air outlet which are arranged side by side, and the second end is provided with a fresh air supply outlet and a waste gas exhaust port which are arranged side by side; the first heat exchange assembly comprises at least two heat exchange plates which are arranged in parallel at intervals, and each heat exchange plate is internally provided with a hollow structure; the first heat exchange assembly divides the interior of the waste heat recovery device into a first space used for allowing waste gas to flow and penetrate through the outer surface of each heat exchange plate and a second space used for allowing fresh air to flow and pass through. The second heat exchange assembly is arranged at the top of the waste heat recovery device and comprises at least one heat exchange pipeline and at least one group of spraying devices connected to the heat exchange pipeline; and the first filter is arranged between the waste gas inlet and the first heat exchange assembly. The waste heat recovery device can efficiently cool high-temperature waste gas.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment, and particularly relates to a waste heat recovery device for industrial waste gas. Background Art

[0002] In the chemical industry, such as printing and dyeing, papermaking, polyethylene, etc., the process flow is often accompanied by the continuous emission of high-temperature exhaust gas. Take the industrial setting machine commonly used in printing and dyeing factories as an example, the high-temperature exhaust gas discharged reaches above 170°C. If it is discharged directly, on the one hand, the high-temperature exhaust gas is easy to cause fire or burn the operators. On the other hand, since the high-temperature exhaust gas is a certain grade of thermal energy, if it is not used and directly discharged to the environment, it is also a waste of energy resources to a certain extent, which is not conducive to environmental protection and sustainable development of energy.

[0003] Waste heat recovery technology is widely used in power plants and other power generation or energy storage technology fields. In the above-mentioned printing and dyeing manufacturing industry, due to the complex composition of its exhaust gas, especially smoke, lint, oil mist, polyphenyl organic matter, etc. mixed in the exhaust gas, it will hinder the stable flow of exhaust gas inside the heat exchange equipment, which will lead to the actual heat recovery efficiency when using waste heat recovery equipment is very low.

[0004] In view of this, it is necessary to design a new type of waste heat recovery device to improve the problem of low heat exchange efficiency of industrial waste gas during the waste heat recovery process. Utility Model Content

[0005] In order to solve at least one aspect of the above problems and defects in the prior art, the embodiment of the utility model provides a waste heat recovery device for industrial waste gas, which realizes efficient cooling of industrial high-temperature waste gas and recovers waste heat of industrial high-temperature waste gas through the design of heat exchange components and heat exchange channels. The technical solution is as follows:

[0006] According to one aspect of the utility model, a waste heat recovery device for industrial waste gas is provided.

[0007] The waste heat recovery device comprises a shell having a first end and a second end, wherein the first end is provided with an exhaust gas inlet and a fresh air outlet arranged side by side, and the second end is provided with a fresh air supply port and an exhaust gas exhaust port arranged side by side;

[0008] The waste heat recovery device also includes:

[0009] A first heat exchange assembly, comprising at least two heat exchange plates arranged in parallel and spaced apart from each other inside the waste heat recovery device, wherein the interior of each of the at least two heat exchange plates has a hollow structure, wherein the first heat exchange assembly divides the interior of the waste heat recovery device into a first space for allowing exhaust gas to flow through an outer surface of each heat exchange plate and a second space for allowing fresh air to flow through;

[0010] A second heat exchange component is arranged on the top of the waste heat recovery device, and the second heat exchange component includes at least one heat exchange pipeline and at least one group of spray devices connected to the at least one heat exchange pipeline;

[0011] The first filter is arranged between the exhaust gas inlet and the first heat exchange component.

[0012] In some embodiments, the plate surface of each heat exchange plate is parallel to the spraying direction of at least one group of spray devices; the outer surface of each heat exchange plate has a concave-convex structure, which is distributed on the outer surface in a predetermined pattern, and the cross-section of each heat exchange plate presents a wavy shape.

[0013] In some embodiments, the plate surface of each heat exchange plate is arranged to be perpendicular to the first end and / or the second end of the waste heat recovery device; the first end face and the second end face of the first heat exchange component are arranged to be close to the first end of the waste heat recovery device, and the third end face and the fourth end face of the first heat exchange component are arranged to be close to the second end of the waste heat recovery device; the exhaust gas inlet port and the first end face form an air inlet channel in the outer shell, the fourth end face and the exhaust gas exhaust port form an exhaust channel in the outer shell, and the ports of each heat exchange plate on the first end face and the fourth end face are closed; the fresh air supply port and the third end face form an air supply channel in the outer shell, the second end face and the fresh air outlet form an air outlet channel in the outer shell, the ports of each heat exchange plate on the third end face and the second end face are open and the space between each heat exchange plate is closed; inside the first heat exchange component, the flow direction of the exhaust gas is opposite to the flow direction of the fresh air.

[0014] In some embodiments, the first filter is an electrostatic field filter device used to filter high-temperature exhaust gas before entering the first heat exchange component; the first space is the sum of the space on the outside of each heat exchange plate, and the second space is the sum of the hollow structure on the inside of each heat exchange plate.

[0015] In some embodiments, the second heat exchange component includes a water supply main, on which at least one branch branch is arranged, and the at least one branch branch is correspondingly connected to the at least one heat exchange pipeline; each of the at least one heat exchange pipeline includes a first water outlet and a second water outlet; wherein the first water outlet is connected to a corresponding group of spray devices in at least one group of spray devices; the second water outlet is connected to a fire branch; a first control valve is also arranged at the connection between the water supply main and each of the at least one heat exchange pipeline, and the first control valve is used to control the water flow entering the second heat exchange component; each heat exchange pipeline is also provided with a second control valve before the first water outlet and the second water outlet, and the second control valve is used to switch the water from the water supply main into the corresponding group of spray devices or the fire branch; the first water outlet is also connected to a third control valve, and the third control valve is used to control the opening, closing and spraying flow of the corresponding group of spray devices.

[0016] In some embodiments, each spray device in at least one group of spray devices is a 120° solid cone spray head.

[0017] In some embodiments, the waste heat recovery device also includes a second filter, which is arranged between the fresh air supply port and the first heat exchange component, and the second filter is an 80-mesh filter screen.

[0018] In some embodiments, the waste heat recovery device further includes at least one drainage pipeline disposed at the bottom thereof.

[0019] In some embodiments, the waste heat recovery device also includes at least one group of heat exchange parameter monitors, and the number of the at least one group of heat exchange parameter monitors is four groups, and the four groups of heat exchange parameter monitors are respectively arranged at the exhaust gas inlet, the exhaust gas exhaust port, the fresh air supply port and the fresh air outlet; wherein each group of the four groups of heat exchange parameter monitors includes at least one of a temperature sensor, a pressure sensor and a flow sensor, or a combination thereof.

[0020] In some embodiments, the waste heat recovery device also includes a first observation window for replacing the first filter, which is detachably mounted on the outer casing of the waste heat recovery device corresponding to the position of the first filter; the waste heat recovery device also includes at least one second observation window arranged on its outer casing for observing the heat exchange conditions inside the waste heat recovery device.

[0021] The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model has at least one or part of at least one of the following advantages:

[0022] (1) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model increases the heat exchange surface area of ​​the waste gas contacting the heat exchange plate through the concave-convex structure on the surface of the heat exchange plate of the first heat exchange component, thereby improving the heat exchange efficiency;

[0023] (2) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model uses the cross-wind direction heat exchange between waste gas and fresh air in the first heat exchange component to increase the heat exchange temperature difference, thereby improving the waste heat recovery efficiency;

[0024] (3) The waste heat recovery device for industrial waste gas provided in the embodiment of the utility model realizes spray heat exchange through the second heat exchange component, thereby further improving the heat exchange efficiency;

[0025] (4) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model is provided with a filter before the waste gas enters the first heat exchange component, which effectively filters the special impurities in the waste gas, ensures the heat exchange stability of the first heat exchange component, and greatly reduces the deposition of waste gas impurities in the waste heat recovery device;

[0026] (5) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model is provided with temperature, pressure and flow sensors at the inlet and outlet of the waste gas and the fresh air, which can monitor the heat exchange status of the waste gas and the fresh air in real time, which is conducive to timely obtaining abnormal data and taking measures in time when the heat exchange is abnormal, thereby improving the safety and stability of the waste heat recovery device;

[0027] (6) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model can cool down the entire device without stopping the waste heat recovery device by setting a fire branch pipe in the second heat exchange component, thereby avoiding fire safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] These and / or other aspects and advantages of the present invention will become apparent and easily understood from the following description of the preferred embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 is a structural cross-sectional view of a waste heat recovery device according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A schematic structural diagram of a heat exchange plate of a first heat exchange assembly of a waste heat recovery device shown;

[0031] Figure 3 for Figure 1 A top view of the first heat exchange component of the waste heat recovery device shown;

[0032] Figure 4 for Figure 3 The partially enlarged structural schematic diagram of the first heat exchange component at position A shown;

[0033] Figure 5 for Figure 1 A top view of the waste heat recovery device shown;

[0034] Figure 6 for Figure 1 Schematic diagram of the external structure of the waste heat recovery device shown. DETAILED DESCRIPTION

[0035] The technical solution of the utility model is further specifically described below through examples and in combination with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the implementation mode of the utility model with reference to the accompanying drawings is intended to explain the overall utility model concept of the utility model, and should not be understood as a limitation of the utility model.

[0036] In the field of chemical technology, chemical process flows are often accompanied by the production of high-temperature waste gas with complex components. Taking the industrial setting machine commonly used in the printing and dyeing industry as an example, the waste gas it emits has two main characteristics: first, the waste gas temperature is high, generally reaching above 170°C, and if it is directly exhausted, the certain grade of heat energy of the high-temperature waste gas itself will be wasted; second, the waste gas composition is complex, and it usually contains oil mist, polyphenyl organic matter, and a large amount of smoke and lint, which requires special filtering equipment during the treatment process.

[0037] Therefore, considering how to effectively recover and utilize the waste heat of the above-mentioned industrial high-temperature exhaust gas, the embodiment of the utility model provides a new type of waste heat recovery device 100, see Figure 1 , shows the structure of the waste heat recovery device 100, which is mainly composed of a shell 10, a first heat exchange component 20, a second heat exchange component 30, a first filter 40 and other parts.

[0038] The housing 10 has a first end ( Figure 1 The left end of the waste heat recovery device 100 shown in FIG. Figure 1 The right end of the waste heat recovery device 100 is shown in FIG. 1 ). A waste gas inlet 11 and a fresh air outlet 12 are arranged side by side at the first end of the housing 10, and a fresh air supply port 13 and a waste gas exhaust port 14 are arranged side by side at the second end of the housing 10.

[0039] Combination Figure 2 As shown, the first heat exchange component 20 includes at least two heat exchange plates arranged in parallel and spaced relation with each other inside the waste heat recovery device 100, and the interior of each heat exchange plate 21 of the at least two heat exchange plates has a hollow structure; wherein the first heat exchange component 20 divides the interior of the waste heat recovery device 100 into a first space for allowing exhaust gas to flow through the outer surface of each heat exchange plate 21 and a second space for allowing fresh air to flow through each heat exchange plate 21.

[0040] The second heat exchange component 30 is disposed on the top of the waste heat recovery device 100 , and the second heat exchange component 30 includes at least one heat exchange pipeline 31 and at least one group of spray devices 32 connected to the at least one heat exchange pipeline 31 .

[0041] The first filter 40 is disposed between the exhaust gas inlet 11 and the first heat exchange assembly 20 .

[0042] Industrial waste gas is mainly cooled by air-cooled convection heat exchange. When necessary (for example, when the waste gas temperature is too high and the cooling speed needs to be increased, etc.), auxiliary spray liquid cooling is used for faster cooling. After passing through the waste gas inlet 11 and filtered by the first filter 40, the industrial waste gas enters the first space divided by the first heat exchange component 20, and is cooled by the first heat exchange component 20 and the second heat exchange component 30, and is discharged from the waste gas outlet 14. The fresh air used to cool the industrial waste gas enters the second space divided by the first heat exchange component 20 through the fresh air supply port 13 to cool the industrial waste gas, and is then discharged from the fresh air outlet 12. After the industrial waste gas and the fresh air complete the heat exchange, the temperature of the waste gas discharged from the waste gas outlet 14 is greatly reduced (in this embodiment, the waste gas temperature can be reduced to about 60°C on average), and the fresh air obtains thermal energy, so that it has a higher temperature when it is discharged from the fresh air outlet 12, and the higher temperature fresh air can be transported to other processes that require heat exchange to provide a heat source, thereby realizing the recovery and reuse of waste heat from the waste gas.

[0043] In one example, in order to ensure the cooling efficiency of air-cooled convection heat exchange, the flow paths of industrial waste gas and fresh air are arranged crosswise. On the one hand, the flow directions of the two in the first heat exchange component 20 are opposite, and on the other hand, both industrial waste gas and fresh air flow from high to low in the direction of gravity. Figure 1 As shown, an exhaust gas inlet 11 is provided above the first end of the housing 10, and correspondingly, an exhaust gas outlet 14 is provided below the second end of the housing 10. After the industrial high-temperature exhaust gas enters the waste heat recovery device 100 from the exhaust gas inlet 11, it is cooled by heat exchange and the low-temperature exhaust gas is discharged from the exhaust gas outlet 14. A fresh air supply port 13 is provided above the second end of the housing 10, and correspondingly, a fresh air outlet 12 is provided below the first end of the housing 10. After the low-temperature fresh air enters the waste heat recovery device 100 from the fresh air supply port 11 and absorbs the waste heat of the industrial high-temperature exhaust gas, the high-temperature fresh air is delivered from the fresh air outlet 12. At this time, the two ends of each heat exchange plate 21 of the first heat exchange assembly 20 are respectively facing the first end and the second end of the housing 10, that is, the plate surface of each heat exchange plate 21 is arranged to be perpendicular to the first end and the second end. The plate surfaces of each heat exchange plate 21 are arranged parallel to each other and spaced apart and are parallel to the spraying direction of at least one group of spray devices 32 on the top of the waste heat recovery device 100, ensuring that when the spray device 32 is started for spraying, cooling water enters the first space where the industrial waste gas is located, and at the same time the cooling water can be flushed to the outer surface of each heat exchange plate 21.

[0044] Further, in one example, the end surface of the first heat exchange component 20 is arranged corresponding to the flow path of the industrial waste gas and the fresh air. Figure 2 , shows the structure of a heat exchange plate 21 in the first heat exchange assembly 20. First, the plate surface of the heat exchange plate 21 is set as follows Figure 2The hexagonal structure shown in the figure, in particular, has four inclined sides respectively arranged at the first end and the second end close to the housing 10, so that the heat exchange plate 21 forms an inclined first port 211, a second port 212, a third port 213 and a fourth port 214. Afterwards, a plurality of heat exchange plates 21 are arranged in parallel to form a first heat exchange assembly 20, so that four inclined end surfaces are formed on the first heat exchange assembly 20, combined with Figure 1 As shown, it includes a first end face 22 , a second end face 23 , a third end face 24 and a fourth end face 25 .

[0045] Specifically, in one example, combining Figure 1 and Figure 2 As shown, on the side close to the first end of the housing 10, the first end surface 22 of the first heat exchange assembly 20 is composed of the first port 211 of each heat exchange plate 21 and the space between them, and the second end surface 23 is composed of the second port 212 of each heat exchange plate 21 and the space between them. Correspondingly, on the side close to the second end of the housing 10, the third end surface 24 of the first heat exchange assembly 20 is composed of the third port 213 of each heat exchange plate 21 and the space between them, and the fourth end surface 25 is composed of the fourth port 214 of each heat exchange plate 21 and the space between them.

[0046] Furthermore, in one example, the exhaust gas inlet 11 and the first end face 22 form an air inlet channel in the housing 10, and the fourth end face 25 and the exhaust gas outlet 14 form an exhaust channel in the housing 10. Since the industrial exhaust gas flows on the outer surface of each heat exchange plate 21, that is, in the gap between each heat exchange plate 21, it is also necessary to close the ports (all first ports 211 and all fourth ports 214) of each heat exchange plate 21 on the first end face 22 and the fourth end face 25. Correspondingly, the fresh air supply port 13 and the third end face 24 form an air supply channel in the housing 10, and the second end face 23 and the fresh air outlet 12 form an air outlet channel in the housing 10. Since the fresh air flows inside each heat exchange plate 21, the ports (all third ports 213 and all second ports 212) of each heat exchange plate 21 on the third end face 24 and the second end face 23 are set to an open state, and the gaps between the ports are closed. Alternatively, when manufacturing each heat exchange plate 21, the first port 211 and the fourth port 214 are sealed by welding. Alternatively, a baffle is placed in the gap between the second ports 212 of each heat exchange plate 21 and fixed between each second port 212 by welding to seal all the gaps there, and the third port 213 can be treated in the same way.

[0047] In one example, the assembled first heat exchange assembly 20 forms a first space for allowing exhaust gas to flow through the outer surface of each heat exchange plate 21 and a second space for allowing fresh air to flow through the hollow structure inside each heat exchange plate 21. The first space is the sum of the space outside each heat exchange plate 21, and the second space is the sum of the hollow structure of each heat exchange plate 21.

[0048] In one example, see Figure 3 , showing that the heat exchange plate 21 corresponds to Figure 1 and Figure 2 The top view of the heat exchange plate 21 shows that the structures of the inner and outer surfaces of the heat exchange plate 21 determine the heat exchange efficiency of the first heat exchange assembly 20. Generally, in order to increase the actual heat exchange area to achieve the purpose of improving the heat exchange efficiency, the outer surface of the heat exchange plate 21 can be alternatively configured to have a concave-convex structure so that the cross section of the heat exchange plate presents a wavy shape (see Figure 4 Shown Figure 3 The partially enlarged structure at A). Alternatively, the concave-convex structure may be distributed on the outer surface of the heat exchange plate 21 in a predetermined pattern. Figure 2 and Figure 3 The heat exchange plate 21 shown has a concave-convex structure that is evenly and uniformly distributed on the outer surface of the entire heat exchange plate 21. Those skilled in the art can design the distribution of the concave-convex structure according to the actual flow conditions or actual heat exchange conditions of the industrial waste gas on the outer surface of the entire heat exchange plate 21, such as making the concave-convex structure sparse at the location where the flow is obstructed, or using a plane instead to ensure the stability and uniformity of the flow, such as making the concave-convex structure compact at the location where the heat exchange effect deteriorates to increase the heat exchange area, etc. The specific shape and size of the concave-convex structure are usually specifically set after matching the heat exchange calculation based on the actual parameters such as the emission temperature and emission flow of the industrial waste gas. This example only provides some illustrative examples, and those skilled in the art should not be understood as a limitation of the present utility model.

[0049] In one example, alternatively, the plate surface of the heat exchange plate 21 can be manufactured by an integrated stamping process. For each integrated stamping plate surface, both the inner and outer surfaces thereof have, for example, Figure 3 and Figure 4 When the fresh air flows through the heat exchange plate 21, the concave-convex structure can retain the fresh air to a certain extent or guide the fresh air into a turbulent state, which helps to fully exchange heat between the fresh air and the exhaust gas and improve the heat exchange efficiency.

[0050] In one example, the second heat exchange component 30 mainly has three functions. On the one hand, it assists the first heat exchange component 20 in heat exchange (supplementary heat exchange). On the other hand, it can also clean each heat exchange plate 21 of the first heat exchange component 20 and the space inside the shell 10. Still another aspect is that when a fire occurs, it can be connected to an external fire-fighting pipe to realize fire spraying.

[0051] See also Figure 5 , shows a top view of the waste heat recovery device 100, the main components of the second heat exchange assembly 30, such as various pipelines, flanges, valves, etc. are arranged on the top of the shell 10, and the spray device 32 is arranged on the top of the first heat exchange assembly 20 inside the shell 10. Alternatively, in combination Figure 1 and Figure 5 As shown, the second heat exchange assembly 30 includes a water supply main 33, on which at least one branch branch 331 is arranged, and the at least one branch branch 331 is connected to the at least one heat exchange pipeline 31; each heat exchange pipeline 31 of the at least one heat exchange pipeline includes a first water outlet and a second water outlet; wherein the first water outlet is connected to a corresponding group of spray devices 32 in at least one group of spray devices, and the second water outlet is connected to a fire branch pipe (not shown). Since the first heat exchange assembly 20 is formed by a plurality of heat exchange plates 21 arranged at intervals, illustratively, three heat exchange plates 21 are used as a group of heat exchange plates, and a group of spray devices 32 is arranged directly above the group of heat exchange plates, and the group of spray devices 32 is responsible for spraying the water diverted from the water supply main 33 to the gaps between the group of heat exchange plates and the outer surfaces of the three heat exchange plates 21. By analogy, multiple groups of spray devices 32 are repeatedly arranged until the entire first heat exchange assembly 20 is covered. For example, one, two or more groups of spray devices 32 may be provided at the edge of the housing 10 (where there is no first heat exchange assembly 20) to clean the space (such as the wall surface, bottom surface, etc.) in the housing 10. This example only provides some illustrative examples of how to set the spray devices, and those skilled in the art should not be understood as a limitation of the present invention.

[0052] In one example, the fire branch pipe may not be provided in the second heat exchange component 30, and the fire pipeline may be separately provided at other positions of the waste heat recovery device 100. This ensures that in an emergency, even if the water supply in the second heat exchange component 30 fails, the fire pipeline can be used for emergency treatment.

[0053] Further, in one example, alternatively, a first control valve 34 is also provided at the connection between the water supply main 33 and each heat exchange pipeline 31 of at least one heat exchange pipeline, and the first control valve 34 is used to control the water flow entering the second heat exchange assembly 30. Alternatively, a second control valve (not shown) is also provided before the first water outlet and the second water outlet of each heat exchange pipeline 31, and the second control valve is used to switch the water from the water supply main 33 into a corresponding group of spray devices 32 or fire branch pipes. Alternatively, a third control valve (not shown) is also connected to the first water outlet, and the third control valve is used to control the opening, closing and spraying flow of a group of spray devices 32 connected to the first water outlet. The selection of the first control valve 34, the second control valve and the third control valve can be implemented with reference to the conventional technical means and common technical solutions of those skilled in the art, such as using a solenoid valve, a throttle valve, a ball valve, a butterfly valve, etc. This example is only an illustrative example, and those skilled in the art should not be understood as a limitation of the present invention.

[0054] In one example, alternatively, each spray device in at least one group of spray devices 32 may use the same type of spray head or a combination of different types of spray heads, and the spray head type may be a hollow or solid cone spray head, a square spray head, a fan-shaped spray head, a two-fluid or multi-fluid spray head, etc. Preferably, the waste heat recovery device 100 of this embodiment uses a 120° solid cone spray head.

[0055] In one example, if Figure 1 As shown, a first filter 40 is provided for industrial waste gas, and a second filter 50 is provided for fresh air. The first filter 40 is provided in the air intake passage between the waste gas inlet 11 and the first heat exchange component 20 close to the first end of the housing 10, and the second filter 50 is provided in the air supply passage between the fresh air supply port 13 and the first heat exchange component 20 close to the second end of the housing 10.

[0056] Furthermore, in one example, considering that the composition of industrial waste gas is complex and it carries large particles and impurities that are difficult to handle, the first filter 40 uses an electrostatic field filter device. The electrostatic field filter device decomposes impurities and gases by ionization. It has a high purification efficiency and can operate in a high temperature environment, which can meet the filtering requirements of industrial waste gas before waste heat recovery and heat exchange. Since the composition of fresh air is relatively simple compared to industrial waste gas and it is relatively clean in itself, an ordinary 80-mesh filter screen can be used. Of course, those skilled in the art can also choose other types of filters as the first filter 40, such as an ordinary 80-mesh filter screen (which needs to be replaced frequently), a gravity settling chamber, a pulse dust collector, etc. This example only provides some illustrative examples, and those skilled in the art should not understand it as a limitation of the utility model.

[0057] In one example, considering that water, water mist, mixed water vapor, etc. from the second heat exchange component 30 accumulate at the bottom of the shell 10 from top to bottom and contain dirt washed away to form sewage, at least one drainage pipe 60 is provided at the bottom of the waste heat recovery device 100 for collecting and discharging the washed sewage.

[0058] In one example, alternatively, Figure 1 As shown, a drain pipe 70 is also provided below the first filter 40. The drain pipe 70 is L-shaped, wherein one end of the drain pipe 70 opens directly below the first filter 40 and can receive particulate matter filtered out by the first filter 40, and the other end of the drain pipe 70 is close to the bottom of the outer shell 10. The particulate matter in the pipe falls to the bottom of the outer shell 10 through the other end of the drain pipe 70, which is convenient for centralized cleaning during regular maintenance.

[0059] In one example, in order to monitor the heat exchange of the waste heat recovery device 100, a heat exchange parameter monitor needs to be set. It is usually necessary to monitor the flow rate or flow rate of industrial waste gas and fresh air to understand whether the gas flow is stable or whether there is flow obstruction, etc.; and the temperature and humidity of the industrial waste gas and fresh air at their respective inlets and outlets, so as to understand whether the heat exchange effect inside the waste heat recovery device 100 meets the expectations, or whether the internal heat exchange is obstructed, resulting in deterioration of the heat exchange, etc. See Figure 5 and Figure 6 , showing the number and position of at least one set of heat exchange parameter monitors 80. Alternatively, four sets of heat exchange parameter monitors are used in this example, including a first heat exchange parameter monitor 81, a second heat exchange parameter monitor 82, a third heat exchange parameter monitor 83 and a fourth heat exchange parameter monitor 84, which are respectively arranged at the exhaust gas inlet 11, the exhaust gas outlet 14, the fresh air supply port 13 and the fresh air outlet 12. Among them, each set of heat exchange parameter monitors includes at least one of a temperature sensor, a pressure sensor and a flow sensor or a combination thereof. For example, in this example, considering that the flow rate and temperature of industrial waste gas are large, in order to monitor the remaining heat recovery in real time, so as to find the cause and handle it as soon as possible when a fault occurs, a temperature sensor, a pressure sensor and a flow sensor are configured in the above four heat exchange parameter monitors. This example is only an illustrative example, and those skilled in the art should not be understood as a limitation of the utility model.

[0060] In one example, an observation window or a movable back panel can be provided on the housing 10, so that, during routine maintenance, for example, the conditions of the pipes, heat exchange plates, filters and other components inside the waste heat recovery device 100 can be observed through these observation windows. Alternatively, in this example, a first observation window 15 for replacing the first filter 40 is provided on the housing 10, and is detachably mounted on the housing 10 corresponding to the position of the first filter 40. Alternatively, in this example, at least one second observation window (not shown) is provided on the housing 10 of the waste heat recovery device 100 for observing the heat exchange conditions of the first heat exchange component 20 and the second heat exchange component 30, and a side panel of the housing 10 can also be used as the second observation window.

[0061] The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model has at least one or part of at least one of the following advantages:

[0062] (1) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model increases the heat exchange surface area of ​​the waste gas contacting the heat exchange plate through the concave-convex structure on the surface of the heat exchange plate of the first heat exchange component, thereby improving the heat exchange efficiency;

[0063] (2) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model uses the cross-wind direction heat exchange between waste gas and fresh air in the first heat exchange component to increase the heat exchange temperature difference, thereby improving the waste heat recovery efficiency;

[0064] (3) The waste heat recovery device for industrial waste gas provided in the embodiment of the utility model realizes spray heat exchange through the second heat exchange component, thereby further improving the heat exchange efficiency;

[0065] (4) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model is provided with a filter before the waste gas enters the first heat exchange component, which effectively filters the special impurities in the waste gas, ensures the heat exchange stability of the first heat exchange component, and greatly reduces the deposition of waste gas impurities in the waste heat recovery device;

[0066] (5) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model is provided with temperature, pressure and flow sensors at the inlet and outlet of the waste gas and the fresh air, which can monitor the heat exchange status of the waste gas and the fresh air in real time, which is conducive to timely obtaining abnormal data and taking measures in time when the heat exchange is abnormal, thereby improving the safety and stability of the waste heat recovery device;

[0067] (6) The waste heat recovery device for industrial waste gas provided by the embodiment of the utility model can cool down the entire device without stopping the waste heat recovery device by setting a fire branch pipe in the second heat exchange component, thereby avoiding fire safety hazards.

[0068] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by the claims and their equivalents.

Claims

1. A waste heat recovery device for industrial waste gas, the waste heat recovery device comprising a shell, the shell having a first end and a second end, the first end being provided with a waste gas inlet and a fresh air outlet arranged side by side, the second end being provided with a fresh air supply port and a waste gas exhaust port arranged side by side; It is characterized in that The waste heat recovery device also includes: The first heat exchange assembly comprises at least two heat exchange plates arranged in parallel and spaced apart from each other inside the waste heat recovery device, wherein each of the at least two heat exchange plates has a hollow structure inside, wherein The first heat exchange assembly divides the interior of the waste heat recovery device into a first space for allowing exhaust gas to flow through the outer surface of each heat exchange plate and a second space for allowing fresh air to flow through; A second heat exchange component is arranged on the top of the waste heat recovery device, and the second heat exchange component includes at least one heat exchange pipeline and at least one group of spray devices connected to the at least one heat exchange pipeline; The first filter is arranged between the exhaust gas inlet and the first heat exchange component.

2. The waste heat recovery device according to claim 1, characterized in that: The plate surface of each heat exchange plate is parallel to the spraying direction of the at least one group of spraying devices; The outer surface of each heat exchange plate has a concave-convex structure, and the concave-convex structure is distributed on the outer surface in a predetermined pattern. The cross section of each heat exchange plate presents a wave shape.

3. The waste heat recovery device according to claim 2, characterized in that: The plate surface of each heat exchange plate is arranged to be perpendicular to the first end and / or the second end; The first end surface and the second end surface of the first heat exchange component are arranged close to the first end, and the third end surface and the fourth end surface of the first heat exchange component are arranged close to the second end; The exhaust gas inlet and the first end surface form an inlet passage in the shell, the fourth end surface and the exhaust gas outlet form an exhaust passage in the shell, and the ports of each heat exchange plate on the first end surface and the fourth end surface are closed; The fresh air supply port and the third end face form an air supply channel in the shell, the second end face and the fresh air outlet port form an air outlet channel in the shell, the ports of each heat exchange plate on the third end face and the second end face are open and the space between each heat exchange plate is closed; Inside the first heat exchange component, the flow direction of the exhaust gas is opposite to the flow direction of the fresh air.

4. The waste heat recovery device according to claim 3, characterized in that: The first filter is an electrostatic field filter device used for filtering high-temperature exhaust gas before entering the first heat exchange component; The first space is the sum of the spaces outside each heat exchange plate, and the second space is the sum of the hollow structures.

5. The waste heat recovery device according to any one of claims 2 to 4, characterized in that: The second heat exchange assembly includes a water supply main pipe, on which at least one branch pipe is arranged, and the at least one branch pipe is correspondingly connected to the at least one heat exchange pipeline; Each of the at least one heat exchange pipeline comprises a first water outlet and a second water outlet; wherein, The first water outlet is connected to a corresponding group of spray devices in the at least one group of spray devices, The second water outlet is connected to a fire branch pipe; A first control valve is also provided at the connection between the water supply main and each heat exchange pipeline of at least one heat exchange pipeline, and the first control valve is used to control the water flow entering the second heat exchange component; Each heat exchange pipeline is also provided with a second control valve before the first water outlet and the second water outlet, and the second control valve is used to switch the water from the water supply main into the corresponding group of sprinkler devices or fire branch pipes; The first water outlet is also connected to a third control valve, and the third control valve is used to control the opening, closing and spraying flow of the corresponding group of spraying devices.

6. The waste heat recovery device according to claim 5, characterized in that: Each spray device in the at least one group of spray devices is a 120° solid cone spray head.

7. The waste heat recovery device according to claim 6, characterized in that: The waste heat recovery device also includes a second filter, which is arranged between the fresh air supply port and the first heat exchange component, and the second filter is an 80-mesh filter screen.

8. The waste heat recovery device according to claim 7, characterized in that: The waste heat recovery device also includes at least one drainage pipeline arranged at the bottom thereof.

9. The waste heat recovery device according to claim 8, characterized in that: The waste heat recovery device also includes at least one group of heat exchange parameter monitors, and the number of the at least one group of heat exchange parameter monitors is four. The four groups of heat exchange parameter monitors are respectively arranged at the exhaust gas inlet, exhaust gas exhaust port, fresh air supply port and fresh air outlet; wherein each group of the four groups of heat exchange parameter monitors includes at least one of a temperature sensor, a pressure sensor and a flow sensor, or a combination thereof.

10. The waste heat recovery device according to claim 9, characterized in that: The waste heat recovery device further comprises a first observation window for replacing the first filter, which is detachably mounted on the housing of the waste heat recovery device at a position corresponding to the first filter; The waste heat recovery device further comprises at least one second observation window disposed on its outer shell for observing the heat exchange conditions inside the waste heat recovery device.

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