Waste heat waste water recovery device

Abstract

The utility model provides a waste heat waste water recovery device and relates to the technical field of waste water recovery, waste heat waste water enters a heat exchanger for heat exchange, the temperature and solubility of the waste water after heat exchange are reduced, various impurities such as salts in the waste water are separated out and then adsorbed on a packing layer, and the waste water is recycled. The saturated waste water is conveyed into a centrifugal machine through a first pipeline to be centrifuged, recycled water with low salt content is obtained after centrifugation, the recycled water with low salt content is conveyed into a heat exchange coil through a liquid phase outlet of the centrifugal machine to exchange heat with waste heat waste water so as to achieve the preheating effect, and then the recycled water is conveyed into a boiler through an outlet of the heat exchange coil to be recycled. Through the arrangement, heat recovery is achieved in the heat exchanger, water recycling is achieved in the centrifugal machine, waste of a large amount of heat energy and water resources is avoided, pollution to the environment is avoided, the filler layer is arranged in the shell, various impurities such as salt in waste water are separated out and then adsorbed on the filler layer, and the waste water is recycled. The heat exchanger is not easily blocked.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater recovery technical field especially relates to a waste heat wastewater recovery device. BACKGROUND

[0002] Industrial boiler produces a large amount of high-temperature heat wastewater in the operation process, and the high-temperature heat wastewater forms concentrated water with continuous evaporation concentration, and there are various impurities such as salts in the concentrated water, if directly discharging into the ditch, it can cause a large amount of heat energy waste, and cause heat pollution to the environment, in the prior art, in order to avoid the direct discharge of various impurities such as salts in the concentrated water, cause a large amount of heat energy waste, and cause heat pollution to the environment, therefore, the concentrated water needs to be recovered, the existing factory generally recovers heat by using plate heat exchanger or tube heat exchanger, and the temperature of the wastewater recovered from heat drops, a large amount of impurities can be precipitated in the plate heat exchanger or tube heat exchanger, and adhere to the inner wall surface of the plate heat exchanger or tube heat exchanger, form dirt, and the formed dirt can block the plate heat exchanger or tube heat exchanger, and is not easy to clean. SUMMARY

[0003] Therefore, the utility model provides a waste heat wastewater recovery device to solve the technical problem that the temperature of the wastewater recovered from heat drops in the prior art, a large amount of impurities can be precipitated in the plate heat exchanger or tube heat exchanger and adhere to the inner wall surface, dirt can be formed, the plate heat exchanger or tube heat exchanger can be blocked, and it is not easy to clean.

[0004] The technical scheme that the utility model solves the above technical problem is as follows:

[0005] A waste heat wastewater recovery device, comprising:

[0006] At least one heat exchanger, the heat exchanger comprises a shell, a filler layer is detachably arranged in the shell, and a heat exchange coil is coiled on the outer side of the shell;

[0007] A waste heat wastewater pipe is connected with the inlet of the shell;

[0008] A centrifuge, the outlet of the shell is connected with the inlet of the centrifuge through a first pipeline, the liquid phase outlet of the centrifuge is connected with the inlet of the heat exchange coil through a second pipeline, the outlet of the heat exchange coil is a boiler water inlet pipe, and the at least one heat exchanger is connected in parallel.

[0009] Preferably, the shell comprises a cylinder body and upper and lower covers detachably arranged at both ends of the cylinder body.

[0010] Preferably, the cross section of the heat exchange coil is semicircular, one side of the heat exchange coil away from the arc-shaped outer side is a flat side, and the flat side of the heat exchange coil is in heat exchange contact with the outer side of the shell.

[0011] Preferably, the filler layer fills the shell.

[0012] Preferably, the inner surface of the shell is a smooth surface.

[0013] Preferably, a descaling tank is further included, a descaling agent feeding pipe is arranged on the descaling tank, the waste heat wastewater pipe is connected with the inlet of the descaling tank, and the outlet of the descaling tank is connected with the inlet of the shell through a third pipeline.

[0014] Preferably, an insulation layer is arranged on the outer side of the descaling tank.

[0015] Preferably, a circulating pipeline is further included, one end of the circulating pipeline is connected with the first pipeline and located between the outlet of the shell and the centrifugal machine, and the other end of the circulating pipeline is connected with the inlet of the shell.

[0016] Preferably, the second pipeline is provided with a pure water adding pipe.

[0017] Preferably, a scale inhibition tank is arranged on the second pipeline and located between the pure water adding pipe and the inlet of the heat exchange coil.

[0018] Compared with the prior art, the present application has at least the following advantages:

[0019] The waste heat wastewater recycling device provided by the present application comprises a heat exchanger, a waste heat wastewater pipe and a centrifugal machine, the heat exchanger comprises a shell, a filler layer is detachably arranged in the shell, a heat exchange coil is coiled on the outer side of the shell, the waste heat wastewater pipe is connected with the inlet of the shell, after the waste heat wastewater enters the heat exchanger, the waste heat wastewater is subjected to heat exchange by the heat exchanger, the temperature of the waste water after heat exchange is reduced, and the solubility is also reduced, the salts and various impurities in the waste water are separated out and adsorbed on the filler layer, the saturated waste water is transported to the centrifugal machine through the first pipeline for centrifugal separation, the recycled water with a small amount of salts is obtained after centrifugal separation, the recycled water with a small amount of salts is transported to the heat exchange coil through the liquid phase outlet of the centrifugal machine and subjected to heat exchange with the waste heat wastewater to achieve the effect of preheating, and the recycled water is transported to the boiler through the outlet of the heat exchange coil for recycling. Through the above arrangement, the heat recovery is realized in the heat exchanger, the water recycling is realized by the centrifugal machine, a large amount of heat energy and water resources are not wasted, and the environment is not polluted, the filler layer is arranged in the shell, the salts and various impurities in the waste water are separated out and adsorbed on the filler layer, the shell and the filler layer are detachable, when a large amount of impurities are separated out on the filler layer, the shell and the filler layer can be directly detached and cleaned and replaced, so that the heat exchanger is prevented from being blocked. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a structural schematic view of a waste heat wastewater recycling device.

[0021] Fig. 2 It is a structure diagram of the heat exchanger shell;

[0022] Fig. 3 It is a structure diagram of the heat exchanger shell upper cover detachable;

[0023] Fig. 4 It is a structure diagram of the filler layer.

[0024] In the figure: heat exchanger 100, shell 110, upper cover 111, lower cover 112, filler layer 120, heat exchange coil 130, boiler water inlet pipe 131, first pipe 140, waste heat wastewater pipe 200, centrifuge 300, second pipe 310, descaling tank 400, descaling agent feeding pipe 410, third pipe 420, circulating pipe 500, pure water adding pipe 510, scale inhibition tank 520. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Please refer to Figs. 1 to 4 The application discloses a waste heat wastewater recycling device, which comprises:

[0027] At least one heat exchanger 100, the heat exchanger 100 comprises a shell 110, a filler layer 120 is detachably arranged in the shell 110, and a heat exchange coil 130 is wound outside the shell 110.

[0028] A waste heat wastewater pipe 200 is connected with the inlet of the shell 110.

[0029] A centrifuge 300 is connected with the outlet of the shell 110 through a first pipe 140, a liquid phase outlet of the centrifuge 300 is connected with the inlet of the heat exchange coil 130 through a second pipe 310, and the outlet of the heat exchange coil 130 is a boiler water inlet pipe 131; and the at least one heat exchanger 100 is arranged in parallel.

[0030] Specific, including heat exchanger 100, waste heat wastewater pipe 200 and centrifuge 300, heat exchanger 100 includes shell 110, the shell 110 can be detachably provided with filler layer 120, after the saturation of the impurities in the waste water adsorbed on the filler layer 120, that is, when the filler layer 120 is rich in impurities, the shell 110 and the filler layer 120 can be detached, so that the filler layer 120 is taken out from the shell 110 for cleaning, realizing the reuse of the filler layer 120.

[0031] The waste heat wastewater discharged by the boiler enters the shell 110, and after the heat exchanger 100 absorbs the heat energy of the waste heat wastewater in the shell 110, it is transported to the centrifuge 300 through the first pipeline 140 for centrifugation, and the recovered water with less salt content is obtained after centrifugation, which is transported to the heat exchange coil 130 through the liquid phase outlet of the centrifuge 300, and then transported to the boiler through the outlet of the heat exchange coil 130 for recycling.

[0032] The shell 110 is coiled with the heat exchange coil 130, the waste heat wastewater pipe 200 is connected with the inlet of the shell 110, the waste heat wastewater enters the heat exchanger 100, absorbs the heat energy of the waste heat wastewater through the heat exchanger 100, the temperature of the waste water after heat exchange decreases, and the solubility also decreases, various impurities such as salts in the waste water are precipitated and adsorbed on the filler layer 120, the saturated waste water is transported to the centrifuge 300 through the first pipeline 140 for centrifugation, and the recovered water with less salt content is obtained after centrifugation, which is transported to the heat exchange coil 130 through the liquid phase outlet of the centrifuge 300, and then transported to the boiler through the outlet of the heat exchange coil 130 for recycling. The utility model discloses a kind of through this setting, both recycling heat in heat exchanger 100 and recycling water through centrifuge 300 are realized, a large amount of heat energy waste and water resource waste are not caused, and heat pollution is not caused to environment.

[0033] Meanwhile, the filler layer 120 is detachably arranged in the shell 110, and various impurities such as salts in the waste water are adsorbed on the filler layer 120 after being precipitated, and the precipitated impurities are attached to the filler layer 120. When the filler layer 120 is rich in impurities, it can be directly detached and cleaned, so that the heat exchanger 100 is not easily blocked, and the shell 110 has a larger channel. Even if the precipitated impurities are attached to the inner wall of the shell 110, the entire shell 110 is not easily blocked. The filler layer 120 is attached to the impurities, and then the filler layer 120 is detached and cleaned, so that the heat exchanger 100 is not easily blocked.

[0034] In a preferred embodiment, the shell 110 includes a cylinder body and an upper cover 111 and a lower cover 112 detachably arranged at both ends of the cylinder body.

[0035] Specifically, by setting the upper cover 111 and the lower cover 112 of the cylinder body to be detachable, after the waste heat wastewater enters the heat exchanger 100, the waste heat wastewater is heat-exchanged by the heat exchanger 100, the temperature of the wastewater after heat exchange is reduced, and the solubility is also reduced, various impurities such as salts in the wastewater are precipitated and adsorbed on the filler layer 120, when the filler layer 120 is adsorbed with too much salt crystalline, the filler layer 120 in the cylinder body can be taken out for cleaning and replacement by opening the upper cover 111 or the lower cover 112 of the cylinder body.

[0036] In a preferred embodiment, the cross-sectional shape of the heat exchange coil 130 is semicircular, the side of the heat exchange coil 130 away from the arc-shaped outer side is a flat side, and the flat side of the heat exchange coil 130 is in heat exchange contact with the outer side of the shell 110.

[0037] Specifically, the cross-sectional shape of the heat exchange coil 130 is set to be semicircular, the side of the heat exchange coil 130 away from the arc-shaped outer side is a flat side, and the flat side of the heat exchange coil 130 is in heat exchange contact with the outer side of the shell 110, when the waste heat wastewater enters the heat exchanger 100 and is heat-exchanged in the heat exchanger 100, the flat side of the heat exchange coil 130 is in heat exchange contact with the outer side of the shell 110, and the heat exchange effect is good.

[0038] In a preferred embodiment, the filler layer 120 fills the shell 110.

[0039] Specifically, the filler layer 120 fills the shell 110, the waste heat wastewater pipe 200 is connected to the inlet of the shell 110, after the waste heat wastewater enters the heat exchanger 100, the waste heat wastewater is heat-exchanged by the heat exchanger 100, the temperature of the wastewater after heat exchange is reduced, and the solubility is also reduced, various impurities such as salts in the wastewater are precipitated and adsorbed on the filler layer 120, and the various impurities such as salts will form dirt, and it is tried to avoid that the inner wall of the shell 110 is also adsorbed with dirt.

[0040] In a preferred embodiment, the inner surface of the shell 110 is a smooth surface.

[0041] Specifically, the smoothness of the inner surface of the shell 110 is usually represented by the surface roughness. Common surface roughness parameters include Ra (arithmetic average roughness), Rz (maximum height roughness), etc. Preferably, the smoothness of the inner surface of the shell 110 reaches Ra 0.2 μm to Ra 0.8 μm, indicating that the surface is very smooth, and the smoothness of the inner surface of the shell 110 reaches Ra 1.6 μm to Ra 3.2 μm, indicating that the surface is relatively smooth. As preferred, the smoothness of the inner surface of the shell 110 in the present application is Ra 0.2 μm to Ra 0.8 μm. By setting the surface inside the shell 110 to be very smooth, after the waste heat water enters the heat exchanger 100, the waste heat water is heat-exchanged by the heat exchanger 100, and after heat exchange, the temperature of the waste water is reduced, and the solubility is also reduced. The salts and various impurities in the waste water are precipitated and adsorbed on the filler layer 120. When the filler layer 120 is adsorbed with too much salt and various impurities, it is convenient to disassemble and replace. During the heat exchange of the waste heat water, the salts and impurities form scale and are adsorbed on the inner wall of the shell 110. The inner surface of the shell 110 is set to a smooth inner surface, which facilitates cleaning of the scale on the inner surface of the shell 110.

[0042] In the prior art, the waste heat water discharged from the boiler contains a large amount of scale inhibitors, which prevent the precipitation of salt impurities in the waste water, affecting the subsequent precipitation of impurities on the filler layer 120, and affecting the centrifugation effect when the heat-exchanged waste water is centrifuged, resulting in a large amount of salt-containing impurities in the recovered water after centrifugation, which does not meet the recovery standard, causing waste of recovered water.

[0043] In a preferred embodiment, preferably, a descaling tank 400 is further included, the descaling tank 400 is provided with a descaling agent feeding pipe 410, the waste heat water pipe 200 is connected to the inlet of the descaling tank 400, and the outlet of the descaling tank 400 is connected to the inlet of the shell 110 through a third pipe 420.

[0044] By adding the descaling tank 400, a descaling agent can be added to the waste heat water discharged from the boiler to destroy the scale inhibitors in the waste heat water, which facilitates the subsequent absorption of heat energy of the waste heat water by the heat exchanger 100 after the waste heat water enters the heat exchanger 100, reduces the temperature and solubility of the waste water, and precipitates the salts and various impurities in the waste water and adsorbs them on the filler layer 120. It is also convenient to reduce the salt content in the recovered water after subsequent centrifugation by the centrifugal machine 300 to meet the recovery standard. Specifically, the descaling agent can be an acid or a base, and the present application does not make further limitation, as long as the recovery effect is achieved.

[0045] The waste heat and waste water discharged from the boiler is firstly transported to the descaling tank 400 in the conveying process. Since the descaling tank 400 is added, the length of the pipeline in the conveying process of the waste heat and waste water is increased, which causes the waste of the heat of the waste heat and waste water at this position, and the heat recovery effect of the subsequent waste heat and waste water is poor.

[0046] In a preferred embodiment, the outer side of the descaling tank 400 is preferably provided with a heat preservation layer.

[0047] Specifically, the heat preservation layer is arranged on the outer side of the descaling tank 400, and the waste heat and waste water is preserved after being transported to the descaling tank 400, so that the temperature of the waste heat and waste water is prevented from being reduced in the process of being transported to the heat exchanger 100 through the outlet end of the descaling tank 400, the heat is prevented from being wasted, and the heat recovery effect of the waste heat and waste water is improved.

[0048] In a preferred embodiment, the circulating pipeline 500 is further included, one end of the circulating pipeline 500 is connected with the first pipeline 140 and located between the outlet of the shell 110 and the centrifugal machine 300, and the other end is connected with the inlet of the shell 110.

[0049] Specifically, after the waste heat and waste water enters the heat exchanger 100, the heat energy of the waste heat and waste water is absorbed by the heat exchanger 100, the temperature of the waste water after heat exchange is reduced, the waste water after heat exchange is transported to one end of the circulating pipeline 500 through the first pipeline 140, since the various impurities such as salts in the waste heat and waste water cannot be completely precipitated, the waste water after heat exchange is transported to the shell 110 through the other end of the circulating pipeline 500 to continue heat exchange, and the recycling of the heat and the further recovery of the salt impurities in the waste water are realized.

[0050] After the saturated waste water is centrifuged, since the saturated waste water still contains salt impurities, a part of the relatively thick salt impurities (containing water) is precipitated, which causes the loss of water in the boiler, and the saturated waste water after centrifugation returns to the heat exchange coil 130 to continue heat exchange with the waste heat and waste water.

[0051] In a preferred embodiment, the second pipeline 310 is provided with a pure water adding pipe 510.

[0052] Specifically, after the saturated waste water is centrifuged, since the saturated waste water still contains salt impurities, a part of the relatively thick salt impurities is precipitated, and the saturated waste water after centrifugation returns to the heat exchange coil 130 to continue heat exchange with the waste heat and waste water, the pure water in the boiler is kept sufficient by arranging the pure water adding pipe 510 on the second pipeline 310.

[0053] In a preferred embodiment, the second pipeline 310 is provided with a descaling tank 520 and located between the pure water adding pipe 510 and the inlet of the heat exchange coil 130.

[0054] Specifically, since the recovered water needs to be continuously recycled in the boiler, in order to avoid that a small amount of impurities such as salts in the recovered water form dirt in the boiler, causing the dirt to adhere to the inner wall of the boiler, affecting the operation of the boiler, therefore, when the recovered water enters the boiler, a scale inhibitor is first added to the recovered water, so that after the recovered water enters the boiler, the dirt formed by the impurities such as salts in the recovered water will not adhere to the inner wall of the boiler.

[0055] The working process of the present application is as follows: the waste heat wastewater discharged from the boiler is introduced into the descaling tank 400, and a descaling agent is added to the descaling tank 400 at the same time to descale the waste heat wastewater, then the descaled waste heat wastewater is introduced into the shell 110 through the outlet end of the descaling tank 400, and the waste heat wastewater is heat-exchanged by the heat exchanger 100, the heat energy of the waste heat wastewater is absorbed by the heat exchanger 100, the temperature and solubility of the waste water after heat exchange are reduced, and various impurities such as salts in the waste water are precipitated and adsorbed on the filler layer 120 to obtain saturated waste water, a part of the saturated waste water is transported to the centrifuge 300 through the first pipeline 140 for centrifugation, and a part of the saturated waste water is transported to the circulating pipeline 500 through the first pipeline 140, a part of the saturated waste water transported to the centrifuge 300 is obtained after centrifugation by the centrifuge 300 to obtain recovered water with less salt content, the recovered water with less salt content is introduced into the scale inhibitor tank 520 through the liquid phase outlet of the centrifuge 300, a scale inhibitor is added to the recovered water with less salt content, then the recovered water with less salt content is introduced into the heat exchange coil 130 through the outlet end of the scale inhibitor tank 520, and the heat exchange with the waste heat wastewater is used to achieve the effect of preheating, and is transported to the boiler through the outlet of the heat exchange coil 130 for recycling. A part of the saturated waste water is transported to one end of the circulating pipeline 500 through the first pipeline 140, and the one end of the circulating pipeline 500 is connected with the inlet of the shell 110, since the various impurities such as salts in the waste heat wastewater will not be completely precipitated, a part of the saturated waste water is introduced into the shell 110 through the one end of the circulating pipeline 500 for continuous heat exchange, realizing the recycling of heat and further recovering the salt impurities in the waste water.

[0056] The above only discloses the preferred embodiments of the present application, of course, cannot limit the scope of the present application, and those skilled in the art can understand that all or part of the above-mentioned embodiments can be implemented, and equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A waste heat wastewater recovery device, characterized by, The application relates to a waste heat recovery device for a boiler. The waste heat recovery device comprises at least one heat exchanger, a waste heat and waste water pipe, a centrifuge and a scale breaker tank. The heat exchanger comprises a shell, a filler layer arranged in the shell and a heat exchange coil wound outside the shell. The waste heat and waste water pipe is connected to the inlet of the shell.

2. The waste heat water recovery apparatus according to claim 1, characterized by: The outlet of the shell is connected to the inlet of the centrifuge through a first pipe.

3. The waste heat water recovery apparatus of claim 1, wherein: The liquid phase outlet of the centrifuge is connected to the inlet of the heat exchange coil through a second pipe.

4. The waste heat water recovery apparatus of claim 1, wherein: The outlet of the heat exchange coil is a boiler water inlet pipe.

5. The waste heat water recovery apparatus of claim 1, wherein: The at least one heat exchanger is arranged in parallel.

6. The waste heat water recovery apparatus of claim 1, wherein: The shell comprises a cylinder and upper and lower covers arranged at both ends of the cylinder.

7. The waste heat water recovery apparatus of claim 6, wherein: The cross section of the heat exchange coil is semicircular.

8. The waste heat water recovery apparatus of claim 1, wherein: The flat side of the heat exchange coil is in contact with the outside of the shell.

9. The waste heat water recovery apparatus of claim 1, wherein: The filler layer fills the shell.

10. The waste heat water recovery apparatus of claim 9, wherein: The inner surface of the shell is smooth. The scale breaker tank is provided with a scale breaker feeding pipe. The outlet of the scale breaker tank is connected to the inlet of the shell through a third pipe. The outer surface of the scale breaker tank is provided with a heat preservation layer. The first pipe is connected to the outlet of the shell and the inlet of the centrifuge. The second pipe is provided with a pure water feeding pipe. The second pipe is provided with a scale inhibitor tank between the pure water feeding pipe and the inlet of the heat exchange coil. The second pipe is provided with a pure water feeding pipe. The second pipe is provided with a scale inhibitor tank between the pure water feeding pipe and the inlet of the heat exchange coil.

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