Waste heat recovery device

Abstract

The utility model relates to a waste heat recovery device which comprises a container with a closed cavity, the container is provided with an evaporation section and a condensation section, liquid capable of being evaporated after being heated is arranged in the closed cavity, the evaporation section is a flat box body, the condensation section is a cylindrical barrel, the evaporation section is connected with the condensation section through a connection section, and the connection section is connected with the closed cavity. The two ends of the connection section are communicated with the evaporation section and the condensation section respectively. After the technical scheme is adopted, the evaporation section is the flat box body, the area of a windward side can be reduced, equipment abrasion is reduced, the service life of the equipment is prolonged, the box body has a large enough side heat exchange surface, the heat exchange efficiency is improved, the condensation section adopts a cylindrical structure, the condensation section is more pressure-resistant and not easy to crack, the risk of condensed water leakage is reduced, and the service life of the equipment is prolonged. When the heat exchanger is used for heat exchange of the flue gas channel, the condensation section is arranged outside the flue gas channel, and the occupied space in the flue gas channel can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery device. BACKGROUND

[0002] Waste heat recovery device, for example, low temperature coal economizer is also called flue gas cooler, low pressure coal economizer, flue gas waste heat utilization device and so on. Generally adopt finned tube or light pipe as heat exchange element, water is passed in heat exchange pipe, flue gas flows through the outer wall of heat exchange pipe, because water temperature is lower than flue gas temperature, circulating water absorbs flue gas waste heat through heat exchange pipe, water temperature rises while making flue gas temperature reduce. In order to realize low temperature high efficiency dust removal of electric dust collector, low temperature coal economizer is arranged at the front of dust collector mostly, flue gas contains much ash, heat exchange pipe is prone to wear and tear leakage. According to statistics, 80% of heat exchange pipe leakage is from heating surface wear and tear, 15% is from heating surface corrosion, 5% is from product quality problem. In recent years, in order to realize low temperature electric dust collector to flue dust and SO3 high efficiency capture, low temperature coal economizer is usually arranged in ESP flue gas inlet flue, and the flue gas here has not been treated by dust removal, and the dust concentration in flue gas is high, and the heating surface is subjected to dust particle scouring to appear heat exchange pipe wear and tear leakage. This phenomenon is particularly prominent under high-ash coal quality, and if not well handled, it will lead to smoke wind system blockage, affecting the safe operation of the unit. The phenomenon of ash deposition often occurs simultaneously with the leakage problem, especially when the hydrogen escape rate of the denitration system exceeds the standard, which often forms ammonium bisulfate, causing the formation of hardening ash deposition on the surface of the heat exchange pipe, which is difficult to clean and causes greater leakage risk.

[0003] In order to solve the leakage and blockage problem, a device using heat pipes for heat exchange has appeared on the market. For example, in the Chinese utility model patent with the name "Heat pipe low temperature coal economizer" and the authorization announcement number CN221223474U, a heat pipe low temperature coal economizer is disclosed, which comprises an upper water chamber, a connecting water pipe, a lower water chamber, a gravity heat pipe and a water chamber isolation plate. The gravity heat pipe comprises an evaporation section on the lower side and a condensation section on the upper side. The upper water chamber and the lower water chamber are connected by the connecting water pipe. The connecting water pipe is sleeved on the outer side of the gravity heat pipe. The connecting water pipe is arranged between the upper water chamber and the lower water chamber. The condensation section penetrates from the lower water chamber, passes through the connecting water pipe and then penetrates out of the upper water chamber. The water chamber isolation plate is arranged in the upper water chamber and the lower water chamber. The water chamber isolation plate and the connecting water pipe form an up-and-down reciprocating cooling channel.

[0004] The above-mentioned patent uses heat pipes, so even if the heat pipes on the flue gas side are worn out, the cooling water is not easy to leak. However, a plurality of heat pipes are arranged in the flue gas passage, and the windward surface is large, and the leeward surface of the heat pipe is easy to produce vortex rotation area or dead zone scaling, causing the increase of flue resistance. In order to ensure the operation of the system, the output power of the induced draft fan needs to be increased, which wastes electricity consumption. Moreover, the actual use of heat exchange area of the single device is still small, the use efficiency is low, and the heat exchange area needs to be increased for the same heat quantity, which increases the investment.

[0005] Based on the above problems, the applicant has conducted research, thereby generating the present case. Content of the utility model

[0006] The utility model discloses a waste heat recovery device capable of reducing resistance, improving heat exchange efficiency and equipment service life.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A waste heat recovery device, comprising a container with a closed chamber, the container has an evaporation section and a condensation section, a liquid that can evaporate under heat is arranged in the closed chamber, the evaporation section is a flat box body, the condensation section is a cylindrical barrel, the evaporation section and the condensation section are connected through a connecting section, and the two ends of the connecting section are communicated with the evaporation section and the condensation section respectively.

[0009] As a preferred mode of the utility model, the box body comprises a first plate body and a second plate body, the lower end of the first plate body and the lower end of the second plate body are connected together and form a closed end, the upper end of the first plate body and the upper end of the second plate body form an outlet end, and the connecting section is connected at the outlet end.

[0010] As a preferred mode of the utility model, the left end of the first plate body and the right end of the second plate body are connected together, and the right end of the first plate body and the right end of the second plate body are connected together.

[0011] As a preferred mode of the utility model, the lower end of the first plate body and the lower end of the second plate body are connected together through a bottom plate.

[0012] As a preferred mode of the utility model, the left end of the first plate body and the left end of the second plate body form an inverted V-shaped air guide part or an arc-shaped air guide part.

[0013] As a preferred mode of the utility model, the length of the first plate body is much greater than the spacing between the first plate body and the second plate body, and the length of the second plate body is much greater than the spacing between the first plate body and the second plate body.

[0014] As a preferred mode of the utility model, from the left end to the right end, the distance between the first plate body and the second plate body first increases and then decreases.

[0015] As a preferred mode of the utility model, a condensation water tank is further included, the condensation water tank has a water inlet and a water outlet, the condensation section is located in the condensation water tank, a first perforation is arranged at the lower part of the condensation water tank, and the outer wall of the container is sealingly connected with the inner wall of the first perforation.

[0016] As the preferred mode of the utility model, the container is multiple, and the condensing sections of the multiple containers are arranged along the length direction of the condensing water tank.

[0017] As the preferred mode of the utility model, the smoke passage is further provided with a second perforation in the upper portion, and the outer wall of the container is sealingly connected with the inner wall of the second perforation, and the evaporation sections of the multiple containers are arranged in parallel along the width direction of the smoke passage.

[0018] After the technical scheme of the utility model is adopted, the evaporation section is a flat box, which can reduce the area of the windward surface, reduce the equipment wear, and prolong the service life of the equipment, the box has a large enough side heat exchange surface, the heat exchange efficiency is increased, the condensing section adopts a cylindrical structure, which is more resistant to compression and less likely to crack, and the risk of heat exchange condensate leakage is reduced, the utility model is used for heat exchange in the smoke passage, the condensing section is placed outside the smoke passage, which can reduce the occupied space in the smoke passage. Further, the multiple condensing sections are arranged in the condensing water tank along the length direction, and the multiple evaporation sections are arranged in parallel along the width direction of the smoke passage, so that the smoke passage can accommodate more evaporation sections, the heat recovery efficiency is improved, and the width of the condensing water tank is reduced, and the occupied space of the condensing water tank is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model.

[0020] Figure 2 It is Figure 1 A-A cross-sectional view in the middle.

[0021] Figure 3 It is Figure 1 B-B cross-sectional view of the first embodiment.

[0022] Figure 4 It is Figure 1 B-B cross-sectional view of the second embodiment.

[0023] Figure 5 It is Figure 1 The first embodiment of the condensing section is viewed from C.

[0024] Figure 6 It is Figure 1 The second embodiment of the condensing section is viewed from C.

[0025] Figure 7 It is a structural diagram of another embodiment of the second plate body of the utility model.

[0026] In the figure:

[0027] Evaporation section 10 First plate body 11

[0028] Second plate body 12 wind guide 13

[0029] Closed chamber 14 bottom plate 15

[0030] Linking section 20 condensing section 30

[0031] Condensate tank 40 water inlet 41

[0032] Water outlet 42 first perforation 43

[0033] Flue gas passage 50 second perforation 51

[0034] Heat exchange fin 60 DETAILED DESCRIPTION

[0035] In order to better understand the technical scheme of the utility model, the following will be more detailed in conjunction with the examples.

[0036] Referring to Figures 1 to 7 A waste heat recovery device, in the embodiment, the waste heat recovery device is used for flue gas passage 50 recovery, as a low-temperature coal economizer, of course, the utility model is not limited to be used for flue gas cooling. The utility model, the hollow arrow in the drawing indicates the flow direction of fluous, also can be said to be the wind flow direction. The waste heat recovery device includes the container with closed chamber 14, the container has evaporating section 10 and condensing section 30, and the liquid that can evaporate under heat is arranged in closed chamber 14, and in the embodiment, the liquid is water, and the water amount is selected according to different heat exchange requirements. A certain vacuum degree is formed in closed chamber 14 to reduce the boiling point of water evaporation and improve the heat exchange efficiency. The evaporating section 10 is a flat box, and the condensing section 30 is a cylindrical barrel, the upper end of the cylindrical barrel is closed, and the lower end is open, the evaporating section 10 is connected with the condensing section 30 through the linking section 20, and the two ends of the linking section 20 are communicated with the evaporating section 10 and the condensing section 30 respectively. The box of the utility model is flat, which is different from the existing tubular heat pipe, and the area of the windward surface is much smaller than the side surface of the box.

[0037] As a preferred mode of the utility model, the box includes first plate body 11 and second plate body 12, the lower end of first plate body 11 and the lower end of second plate body 12 are connected together and form a closed end, the upper end of first plate body 11 and the upper end of second plate body 12 form an outlet end, and the linking section 20 is connected at the outlet end. In the utility model, the lower end of the linking section 20 is connected with the flat box, and the upper end of the linking section 20 is connected with the condensing section 30 in the form of cylindrical barrel, and the whole linking section 20 is a barrel with changing cross section.

[0038] In a preferred embodiment of the present invention, the left end of the first plate 11 is connected to the right end of the second plate 12, and the right end of the first plate 11 and the right end of the second plate 12 are connected together.

[0039] In a preferred embodiment of this utility model, the lower end of the first plate 11 and the lower end of the second plate 12 are connected together by a base plate 15.

[0040] In a preferred embodiment of this utility model, the left end of the first plate 11 and the left end of the second plate 12 form an inverted V-shaped air guide 13. Figure 3 (as shown) or the arc-shaped air guide 13 ( Figure 4 As shown, the V-shaped or arc-shaped air guide 13 is the windward surface of the housing. The V-shaped or arc-shaped air guide 13 can be integrally formed with the first plate 11 and the second plate 12, or it can be assembled separately. For example, by flattening the tube, an integral structure of the first plate 11, the second plate 12, and the arc-shaped air guide 13 can be formed.

[0041] In a preferred embodiment of this invention, the length of the first plate 11 is significantly greater than the distance between the first plate 11 and the second plate 12, and the length of the second plate 12 is significantly greater than the distance between the first plate 11 and the second plate 12. In this invention, "significantly greater than" can mean that the length of the first plate 11 or the length of the second plate 12 is more than 10 times the distance between the first plates 11. In this invention, provided that strength and space in the flue gas passage 50 allow, the lengths of the first plate 11 and the second plate 12 can be increased as much as possible, while reducing the distance between the first plate 11 and the second plate 12. In an embodiment, the first plate 11 and the second plate 12 can be made of stainless steel.

[0042] In a preferred embodiment of this utility model, the distance between the first plate 11 and the second plate 12 first increases and then decreases from the left end to the right end.

[0043] As a preferred embodiment of this utility model, it also includes a condensate tank 40, which is rectangular in shape and has an inlet 41 and an outlet 42. The condensation section 30 is located in the condensate tank 40, and a first perforation 43 is provided at the lower part of the condensate tank 40. The outer wall of the container is sealed to the inner wall of the first perforation 43, for example, by welding to seal the gap between the two to prevent water leakage from the condensate tank 40. During heat exchange, condensate enters from the inlet 41 and flows out from the outlet 42. The condensate carries away the heat from the condensation section 30, and the gaseous substances in the condensation section 30 cool down to form liquid and flow back to the evaporation section 10.

[0044] As the preferred mode of the utility model, the container is multiple, the condensing section 30 of multiple container is arranged along the length direction of the condensing water tank 40, in the embodiment, the central axis of condensing section 30 is located in the same plane.

[0045] As the preferred mode of the utility model, still include flue gas passage 50, flue gas passage 50 is located below the condensing water tank 40, the upper portion of flue gas passage 50 is equipped with second perforation 51, the outer wall of the container is sealedly connected with the inner wall of second perforation 51, for example, the gap of both can be sealed by welding, avoid flue gas leakage, the evaporation section 10 of multiple container is arranged in parallel along the width direction of flue gas passage 50, that is, each evaporation section 10 is arranged along the width direction of condensing water tank 40, the utility model passes through the different trend of the linking section 20 in each container and makes evaporation section 10 parallel arrangement and condensing section 30 linear arrangement, to reduce the volume of water tank, reduce the impact of water pressure to condensing section 30, can guarantee that evaporation section 10 in flue gas passage 50 has enough heat exchange area, improves heat exchange efficiency, guarantees the service life of equipment again.

[0046] As the preferred mode of the utility model, to improve the heat dissipation effect of first plate body 11 and second plate body 12, still can further set up heat exchange fin 60 on first plate body 11 and second plate body 12, for example Figure 7 Display is set up heat exchange fin 60 on second plate body 12, by setting up heat exchange fin 60, further increase heat exchange area, improve heat exchange efficiency, in the embodiment, heat exchange fin 60 is multiple, multiple heat exchange fin 60 extends along the length direction of second plate body 12, multiple heat exchange fin 60 is arranged along the height direction of second plate body 60, the air flow passage is formed between adjacent heat exchange fin 60, the heat of flue gas is transferred to second plate body 12 through heat exchange fin 60, and then into evaporation section.

[0047] The protection scope of the utility model is not limited in the embodiment, and any person makes similar transformation, which is regarded as not departing from the protection scope of the utility model.

Claims

1. A waste heat recovery device comprising a vessel having an enclosed chamber, the vessel having an evaporation section and a condensation section, the enclosed chamber containing a liquid which is evaporable upon being heated, characterised in that: The evaporation section is a flat box, the condensation section is a cylindrical barrel, the evaporation section and the condensation section are connected through a connecting section, and the two ends of the connecting section are communicated with the evaporation section and the condensation section respectively.

2. A waste heat recovery device as claimed in claim 1, characterised in that: The box comprises a first plate body and a second plate body, the lower end of the first plate body and the lower end of the second plate body are connected together and form a closed end, the upper end of the first plate body and the upper end of the second plate body form an outlet end, and the connecting section is connected to the outlet end.

3. A heat recovery device as claimed in claim 2, characterised in that: The left end of the first plate body and the right end of the second plate body are connected together, and the right end of the first plate body and the right end of the second plate body are connected together.

4. A heat recovery device as claimed in claim 3, characterised in that: The lower end of the first plate body and the lower end of the second plate body are connected together through a bottom plate.

5. A waste heat recovery device as claimed in claim 3, characterised in that: The left end of the first plate body and the left end of the second plate body form an inverted V-shaped air guide part or an arc-shaped air guide part.

6. A heat recovery device as claimed in claim 3, characterised in that: The length of the first plate body is much greater than the spacing between the first plate body and the second plate body, and the length of the second plate body is much greater than the spacing between the first plate body and the second plate body.

7. A heat recovery unit as claimed in claim 3, wherein: From the left end to the right end, the distance between the first plate body and the second plate body first increases and then decreases.

8. A heat recovery device as claimed in claim 1, characterised in that: A condensate tank is further included, the condensate tank has a water inlet and a water outlet, the condensation section is located in the condensate tank, the lower part of the condensate tank is provided with a first perforation, and the outer wall of the container is sealingly connected with the inner wall of the first perforation.

9. A heat recovery unit as claimed in claim 8, characterised in that: The container is multiple, and the condensation sections of the multiple containers are arranged along the length direction of the condensate tank.

10. A waste heat recovery device as claimed in claim 9, characterised in that: A flue gas channel is further included, the upper part of the flue gas channel is provided with a second perforation, the outer wall of the container is sealingly connected with the inner wall of the second perforation, and the evaporation sections of the multiple containers are arranged in parallel along the width direction of the flue gas channel.

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