Spiral dead steam recovery device capable of quickly replacing heat exchange tube

Abstract

The utility model discloses a spiral dead steam recovery device capable of quickly replacing a heat exchange tube. The spiral dead steam recovery device comprises a heat exchange cavity, a spiral baffle plate, a straight heat exchange tube and a counterbore hole plate, counterbore hole plates are arranged at the two ends of the heat exchange cavity respectively. The spiral baffle plate is accommodated in the heat exchange cavity; the straight heat exchange pipe is detachably installed in the heat exchange cavity and penetrates through installation holes formed in the spiral baffle plate and the counterbore hole plate in an aligned mode. And the straight heat exchange tubes are connected and fixed through the nuts and the sealing gaskets, so that the straight heat exchange tubes can be quickly dismounted, replaced and mounted after being corroded or damaged.

Description

Technical Field

[0001] The present application relates to the technical field of boiler exhaust steam treatment in the process of redrying tobacco leaves, and in particular to a spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes. Background Art

[0002] The boiler is used to provide heat source during the tobacco baking and re-baking process and is a key production equipment.

[0003] Dissolved oxygen in boiler feed water can cause corrosion of metal interfaces in contact with water, such as containers. At the same time, if oxygen accumulates in the heat exchanger, the thermal resistance of heat transfer will increase, reducing the heat transfer efficiency of the equipment. Existing deaerators are mainly used to deoxygenate boiler feed water to slow down the oxygen corrosion rate of the boiler, extend the life of the boiler, and keep the boiler water clean.

[0004] However, the deaerator will generate steam during operation, resulting in a large amount of exhaust steam at the exhaust port. The presence of exhaust steam will lead to high boiler energy consumption, high cost pressure, and thermal pollution. It is necessary to reduce or eliminate the exhaust steam at the exhaust port and recover and reuse the heat to reduce energy waste and reduce environmental pollution. For example, the direct air-cooling unit exhaust steam waste heat recovery heating system disclosed in CN202010358247.6 has a complex structure and requires a large increase in investment, which increases the cost of exhaust steam waste heat recovery and affects the normal recovery of exhaust steam waste heat.

[0005] For example, the deaerator exhaust steam waste heat recovery system disclosed in CN202321343380.X, in which the deaerator is connected to the boiler deoxygenation steam output end pipeline, receives the deoxygenated steam generated by the boiler and deoxygenates; the heat source input end of the heat exchanger is connected to the exhaust steam discharge end pipeline of the deaerator, and its cold source input end is connected to the boiler secondary economizer return water pipeline; the exhaust steam discharged by the deaerator and the boiler secondary economizer return water can be heat exchanged through the heat exchanger to achieve the purpose of heat recovery. The utility model reasonably utilizes the boiler secondary economizer return water and deoxygenated exhaust steam for heat exchange without increasing the water volume, fully recovers the exhaust heat of deoxygenated exhaust steam, and realizes the reuse of heat.

[0006] However, the pipes inside the existing deaerator are all fixed. When a gas containing a large amount of corrosive impurities is introduced into the deaerator, its internal structure is easily corroded and damaged. However, the deaerator with the existing structure cannot replace the corroded or damaged heat exchange tubes in time. When the heat exchange tubes are corroded or damaged, the entire device needs to be replaced. Therefore, the deaerator with the existing structure cannot be directly used for the effective recovery and reuse of exhaust steam waste heat, resulting in energy waste.

[0007] At the same time, the existing structure of the deaerator exhaust steam flow heat exchange efficiency is low, the waste heat recovery effect is poor, and exhaust steam is easily formed at the exhaust port.

[0008] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in the field. Utility Model Content

[0009] In response to the above technical problems, the present application provides a spiral exhaust steam recovery device that can quickly replace heat exchange tubes. The device can replace and repair internal pipelines in a timely manner according to the corrosion situation, and can also reduce the dead zone of exhaust steam flow and ensure a uniform flow field.

[0010] The present application provides a spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes, comprising: a heat exchange chamber, a spiral baffle, a straight heat exchange tube, and a countersunk hole plate; countersunk holes are respectively arranged at both ends of the heat exchange chamber; the spiral baffle is accommodated in the heat exchange chamber; the straight heat exchange tube is disassembled and installed in the heat exchange chamber, and is passed through the installation holes aligned on the spiral baffle and the countersunk hole plate.

[0011] Preferably, it comprises: a mixed gas discharge pipe; the mixed gas discharge pipe is connected to the first end of the heat exchange chamber.

[0012] Preferably, it comprises: a plurality of nuts and sealing gaskets; both ends of each straight heat exchange tube for disassembly and installation are respectively disassembled and installed on the countersunk hole plate through nuts and sealing gaskets.

[0013] Preferably, it comprises: a plurality of expansion joints; the expansion joints are arranged on the outer wall and close to the mixed gas exhaust pipe.

[0014] Preferably, it comprises: pipe boxes arranged in pairs; the pipe boxes are respectively arranged outside the two ends of the heat exchange cavity and are connected to the heat exchange cavity.

[0015] Preferably, it comprises: a hot water outlet pipe; the hot water outlet pipe is arranged on the pipe box at the second end of the heat exchange cavity.

[0016] Preferably, it comprises: an exhaust steam inlet pipe; the exhaust steam inlet pipe is arranged on the second end of the heat exchange chamber.

[0017] Preferably, it comprises: a condensate outlet pipe; the condensate outlet pipe is arranged on the first end of the heat exchange chamber.

[0018] Preferably, it comprises: a cold water inlet pipe; the cold water inlet pipe is arranged on the first end of the heat exchange chamber.

[0019] Preferably, the spiral baffle comprises: a plurality of spiral plate bodies, one side of any two adjacent spiral plate bodies are connected, and a plurality of mounting holes are arranged on the connected ends and on the spiral plate bodies.

[0020] The beneficial effects of this application include:

[0021] 1) The spiral exhaust steam recovery device with fast replacement of heat exchange tubes provided in the present application uses nuts and sealing gaskets to connect and fix the straight heat exchange tubes, which is convenient for rapid removal, replacement and installation when the straight heat exchange tubes are corroded or damaged. At the same time, the unique spiral baffle structure can form a continuous spiral flow state when the exhaust steam flows through the spiral baffle, reducing the dead zone of exhaust steam flow and ensuring a uniform flow field. The device has a simple structure, is easy to install and has complete functions. It can eliminate the exhaust steam formed at the exhaust port of the deaerator, greatly improves the replacement efficiency of the straight heat exchange tubes and reduces energy consumption such as fuel and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a sectional three-dimensional structure of the overall structure in at least one embodiment provided in the present application;

[0023] Figure 2 A schematic cross-sectional view of a heat exchange chamber structure in at least one embodiment provided in the present application;

[0024] Figure 3 A schematic diagram of the matching structure of the heat exchange chamber and the straight heat exchange tube in at least one embodiment provided in the present application;

[0025] Figure 4 A schematic diagram of the structure of a straight heat exchange tube in at least one embodiment provided in the present application;

[0026] Figure 5 A schematic diagram of a pipe box structure in at least one embodiment provided in the present application;

[0027] Figure 6 A schematic diagram of the condensate outlet pipe structure in at least one embodiment provided in the present application;

[0028] Legend:

[0029] Countersunk hole plate 1, mixed gas external discharge pipe 2, expansion joint 3, heat exchange chamber 4, nut 5, hot water outlet pipe 6, sealing gasket 7, exhaust steam inlet pipe 8, spiral baffle 9, condensate outlet pipe 10, straight heat exchange pipe 11, pipe box 12, cold water inlet pipe 13. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0032] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in the field, and can be implemented in a variety of common knowledge settings.

[0033] See also Figures 1 to 6 The spiral exhaust steam recovery device with quickly replaceable heat exchange tubes provided in the present application includes: a countersunk hole plate 1, a mixed gas exhaust pipe 2, an expansion joint 3, a heat exchange chamber 4, a nut 5, a hot water outlet pipe 6, a sealing gasket 7, an exhaust steam inlet pipe 8, a spiral baffle 9, a condensate outlet pipe 10, a straight heat exchange tube 11, a pipe box 12, and a cold water inlet pipe 13.

[0034] The tube box 12 is fixed to the corresponding holes of the tube sheets at both ends of the heat exchange chamber 4 by bolts and nuts; the tube sheets at the left and right ends of the heat exchange chamber 4 are provided with countersunk hole plates 1, and the straight heat exchange tubes 11 pass through the corresponding holes in the countersunk hole plate 1 and the spiral baffle plate 9 from the left end in turn, and pass through the countersunk hole plate 1 at the right end;

[0035] The outer sides of both ends of the straight heat exchange tube 11 are provided with threads. After being placed at both ends of the heat exchange chamber 4, the sealing gasket 7 and the nut 5 are installed in sequence; the spiral baffle plate 9 is installed inside the heat exchange chamber 4, and the position of the hole on the spiral baffle plate 9 is set one by one corresponding to the position of the countersunk hole plate 1, so as to facilitate the installation of the straight heat exchange tube 11.

[0036] In a specific embodiment, the spiral baffle 9 includes: a plurality of spiral plate bodies, one side of any two adjacent spiral plate bodies are connected, and a plurality of mounting holes are arranged on the connected ends. This arrangement can facilitate replacement and maintenance of the straight heat exchange tubes 11.

[0037] In a specific embodiment, a cold water inlet pipe 13 is provided on the pipe box 12 at the first end; and a hot water outlet pipe 6 is provided on the pipe box 12 at the second end.

[0038] In a specific embodiment, the diameters of the cold water inlet pipe 13 and the hot water outlet pipe 6 are both 30-45 mm.

[0039] In a specific embodiment, a mixed gas discharge pipe 2 is provided above the left end of the heat exchange chamber 4 , and an exhaust steam inlet pipe 8 is provided below the right end of the heat exchange chamber 4 .

[0040] In a specific embodiment, the diameters of the mixed gas discharge pipe 2 and the exhaust steam inlet pipe 8 are both 60-100 mm.

[0041] In a specific embodiment, a condensate outlet pipe 10 is provided below the left end of the heat exchange chamber 4 .

[0042] In a specific embodiment, the diameter of the condensate outlet pipe 10 is 20-35 mm.

[0043] In a specific embodiment, the length of the thread on the straight heat exchange tube 11 is determined according to the size of the countersunk hole plate 1 on the tube sheet, and its position, number, diameter, and length are determined according to the size of the heat exchange chamber 4 and the heat exchange efficiency.

[0044] Specifically, the arrangement of the straight heat exchange tubes 11 can be polygonal, such as circular, triangular, or diamond-shaped, and can be determined according to actual conditions.

[0045] The expansion joint 3 is placed on the outer wall of the heat exchange chamber 4 between the mixed gas discharge pipe 2 and the exhaust steam inlet pipe 8 to absorb the deformation difference between the straight heat exchange tube 10 and the heat exchange chamber 4 .

[0046] In a specific embodiment, the number of expansion joints 3 is 5 to 12, and the axial displacement allowed is -2 to 2 mm.

[0047] In a specific embodiment, the device includes: a spiral baffle 9, the thickness of the spiral baffle 9 is 0.5 to 1 mm, the plate spacing is 50 to 120 mm, the angle is 12 to 40°, and the position, number and size of the internal holes are determined according to the position, number and size of the straight heat exchange tube 10.

[0048] In a specific embodiment, the mixed gas exhaust pipe 2 is used to discharge air and non-condensable gases formed after the exhaust steam and cold water undergo heat exchange.

[0049] In a specific embodiment, the heat exchange chamber 4, the expansion joint 3, and the spiral baffle 9 are made of stainless steel, and the straight heat exchange tube 10 is made of metal materials with high heat transfer coefficient such as low alloy steel, stainless steel, copper, and aluminum alloy.

[0050] In a specific embodiment, a spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes comprises: a countersunk hole plate 1, a mixed gas external discharge pipe 2, an expansion joint 3, a heat exchange chamber 4, a nut 5, a hot water outlet pipe 6, a sealing gasket 7, an exhaust steam inlet pipe 8, a spiral baffle plate 9, a condensed water outlet pipe 10, a straight heat exchange pipe 11, a pipe box 12, and a cold water inlet pipe 13. The pipe box 12 is fixed to the corresponding holes of the tube sheets at both ends of the heat exchange chamber 4 by bolts and nuts; the tube sheets at the left and right ends of the heat exchange chamber 4 are provided with countersunk hole plates 11, and the straight heat exchange pipe 11 is sequentially inserted into the corresponding holes in the countersunk hole plate 1 and the spiral baffle plate 9 from the left end, and is passed out from the countersunk hole plate 1 at the right end; the outer sides of the two ends of the straight heat exchange pipe 11 are provided with threads, and the sealing gaskets 7 and nuts 5 are sequentially installed after being placed at the two ends of the heat exchange chamber 4; the spiral baffle plate 9 is installed inside the heat exchange chamber 4, and the positions of its internal holes correspond to the countersunk hole plates one by one.

[0051] The straight heat exchange tube 11 is passed through the countersunk hole plate 1 at the left end of the heat exchange chamber 4 into the hole of the spiral baffle 9. After being placed in a suitable position, the gasket 7 and the nut 5 are installed in sequence, and then the tube box 12 is installed and fixed with bolts and nuts.

[0052] Cold water flows into the pipe box 12 from the cold water inlet pipe 13 at the upper end of the pipe box 12; the cold water is transported from the left end to the straight heat exchange tube 11 by pressure and flows into the heat exchange chamber 4. After heat exchange, it flows into the pipe box 12 and flows out through the hot water outlet pipe 6 and is used for production.

[0053] Exhaust steam enters the heat exchange chamber 4 through the exhaust steam inlet pipe 8, and uses the spiral baffle 9 to exchange heat with the cold water in the straight heat exchange tube 11. The generated air and non-condensable gas are discharged through the mixed gas exhaust pipe 2. The condensed water generated by the exhaust steam after the heat exchange flows out through the condensed water outlet pipe 10, and the flow directions of the exhaust steam and the cold water form a countercurrent.

[0054] The baffles inside the heat exchange chamber 4 are spiral baffles 9 welded inside the heat exchange chamber 4, so that different flow states can be formed when the exhaust steam flows through the baffles, thereby improving the heat transfer efficiency. The plate spacing, plate thickness and angle can be reasonably designed according to the size of the heat exchange chamber 4.

[0055] The straight heat exchange tube 11 is made of materials with high heat transfer coefficient such as stainless steel, copper and alloy aluminum. When it is severely corroded or damaged and needs to be replaced, the pipe boxes 12 at both ends of the heat exchange cavity, the nuts 5 and the sealing gaskets 7 on the straight heat exchange tube 11 are removed in turn. After replacement, they are installed in the reverse order.

[0056] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes, characterized in that: include: A heat exchange chamber (4), a spiral baffle (9), a straight heat exchange tube (11), and a countersunk hole plate (1); the countersunk hole plates (1) are respectively arranged at both ends of the heat exchange chamber (4); the spiral baffle (9) is accommodated and arranged in the heat exchange chamber (4); the straight heat exchange tube (11) is disassembled and installed in the heat exchange chamber (4), and is inserted into the installation holes that are aligned and opened on the spiral baffle (9) and the countersunk hole plate (1).

2. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 1 is characterized in that: include: A mixed gas discharge pipe (2); the mixed gas discharge pipe (2) is connected to the first end of the heat exchange chamber (4).

3. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 1 is characterized in that: include: A plurality of nuts (5) and sealing gaskets (7); both ends of each straight heat exchange tube (11) for disassembly and installation are respectively disassembled and installed on the countersunk hole plate (1) through the nuts (5) and the sealing gaskets (7).

4. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 2 is characterized in that: include: A plurality of expansion joints (3); the expansion joints (3) are arranged on the outer wall and are arranged close to the mixed gas discharge pipe (2).

5. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 1 is characterized in that: include: The pipe boxes (12) are arranged in pairs; the pipe boxes (12) are respectively arranged outside the two ends of the heat exchange chamber (4) and are connected to the heat exchange chamber (4).

6. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 5 is characterized in that: include: A hot water outlet pipe (6); the hot water outlet pipe (6) is arranged on a pipe box (12) at the second end of the heat exchange chamber (4).

7. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 1 is characterized in that: include: An exhaust steam inlet pipe (8); the exhaust steam inlet pipe (8) is arranged on the second end of the heat exchange chamber (4).

8. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 1 is characterized in that: include: Condensate outlet pipe (10); the condensate outlet pipe (10) is arranged on the first end of the heat exchange chamber (4).

9. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 1, characterized in that: include: A cold water inlet pipe (13); the cold water inlet pipe (13) is arranged on the first end of the heat exchange chamber (4).

10. The spiral exhaust steam recovery device capable of quickly replacing heat exchange tubes according to claim 1, characterized in that: The spiral baffle (9) comprises: a plurality of spiral plate bodies, one side of any two adjacent spiral plate bodies are connected, and a plurality of mounting holes are arranged on the connected ends and on the spiral plate bodies.

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