Welded wide-flow-channel heat exchanger special for paper pulp mill wastewater

Abstract

The utility model discloses a special welding wide flow channel heat exchanger for pulp mill wastewater, which comprises a heat exchanger main body, the heat exchanger main body comprises a wastewater inlet and a purified water outlet which are arranged on the same side face, the heat exchanger main body further comprises a wastewater outlet and a purified water inlet which are arranged on the other same side face, and a plurality of plate pairs which are arranged at equal intervals are arranged in the heat exchanger main body. Each group of plate pair comprises a first heat exchange plate and a second heat exchange plate which are mutually spaced, the first heat exchange plate and the second heat exchange plate are supported between the first heat exchange plate and the second heat exchange plate through a rod to form a purified water flow channel, a waste water flow channel is formed between any two adjacent plate pairs, and the waste water flow channel is implemented in a manner of no barrier support in the flow channel; the flow direction of a medium in the purified water flow channel and the flow direction of a medium in the waste water flow channel are arranged reversely; efficient full countercurrent flow heat exchange is adopted, the circulation section width of the purified water flow channel and the waste water flow channel is increased, waste water is prevented from being deposited, accumulated and blocked, corresponding overhaul and maintenance are simpler and more convenient, the efficiency of the heat exchanger can be greatly improved, and the service life of the heat exchanger can be greatly prolonged.

Description

Technical Field

[0001] The utility model relates to a heat exchanger, in particular to a special welded wide-flow-channel heat exchanger for pulp mill wastewater. Background Art

[0002] During the papermaking production process, a large amount of high-temperature wastewater is generated. The generated high-temperature wastewater needs to be cooled before being transferred to the next process. Therefore, a heat exchanger is introduced during the production process to cool the high-temperature wastewater.

[0003] The traditional heat exchanger is a detachable plate heat exchanger. The flow channels of the plate heat exchanger are relatively small, and the particulate matter in the wastewater medium is likely to deposit and block in the flow channels, affecting the heat exchange effect or even causing it to fail. Moreover, it is difficult to clean after the material is blocked, and the maintenance difficulty is large and the cycle is long. Therefore, the service life of this kind of heat exchanger is short, causing a huge economic burden to the enterprise. Content of the Utility Model

[0004] In order to solve the deficiencies of the above technologies, the utility model provides a special welded wide-flow-channel heat exchanger for pulp mill wastewater.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a special welded wide-flow-channel heat exchanger for pulp mill wastewater, including a heat exchanger main body. The heat exchanger main body includes a wastewater inlet and a purified water outlet arranged on the same side surface, and the heat exchanger main body also includes a wastewater outlet and a purified water inlet arranged on the other same side surface. The heat exchanger main body includes a plurality of plate pairs spaced at equal intervals. Each group of plate pairs includes a first heat exchange plate and a second heat exchange plate spaced from each other. The first heat exchange plate and the second heat exchange plate are supported by rods to form a purified water flow channel therebetween. A wastewater flow channel is formed between any two adjacent plate pairs. The wastewater flow channel is implemented in a manner that there is no obstructive support in its flow channel. The flow direction of the medium in the purified water flow channel is arranged in a countercurrent manner to the flow direction of the medium in the wastewater flow channel.

[0006] Further, the wastewater inlet and the wastewater outlet are located on the same forward side;

[0007] The purified water inlet and the purified water outlet are located on the same forward side.

[0008] Further, the thicknesses of the first heat exchange plate and the second heat exchange plate are the same and are 2.0 - 3.5 mm.

[0009] Further, the first heat exchange plate and the second heat exchange plate of each group of plate pairs are welded to each other and are respectively welded to the rods between them.

[0010] Further, the flow channel width of the purified water flow channel is not less than 6 mm.

[0011] Further, the flow channel width of the wastewater flow channel is not less than 24 mm.

[0012] A special welded wide-flow-channel heat exchanger for pulp mill wastewater adopts an efficient full-countercurrent heat exchange scheme, increases the flow cross-sectional width of the clean water flow channel and the wastewater flow channel, prevents the precipitation and accumulation of wastewater from blocking, and the corresponding maintenance and repair are also more convenient, which can greatly improve the heat exchanger efficiency and service life. Description of the Drawings

[0013] Figure 1 This is the front view of the present utility model.

[0014] Figure 2 This is the schematic diagram of the flow channel of the present utility model.

[0015] Figure 3 This is the specific flow of the wastewater flow channel of the present utility model.

[0016] Figure 4 This is the specific flow of the clean water flow channel of the present utility model.

[0017] In the figure: 1. Heat exchanger body; 2. Wastewater inlet; 3. Wastewater outlet; 4. Clean water inlet; 5. Clean water outlet; 6. Plate pair; 7. First heat exchange plate; 8. Second heat exchange plate; 9. Rod support; 10. Clean water flow channel; 11. Wastewater flow channel. Detailed Description of the Preferred Embodiment

[0018] The present utility model will be further described in detail below in conjunction with the drawings and the specific embodiments.

[0019] As Figures 1-4 As shown together, this embodiment relates to a special welded wide-flow-channel heat exchanger for pulp mill wastewater, including a heat exchanger main body 1. As Figure 1 shown, the heat exchanger main body 1 includes a wastewater inlet 2 and a clean water outlet 5 arranged on the same side surface, and the heat exchanger main body 1 also includes a wastewater outlet 3 and a clean water inlet 4 arranged on the other same side surface;

[0020] The heat exchanger main body 1 includes a plurality of equally spaced plate pairs 6. As Figure 2 shown, each group of plate pairs 6 includes a first heat exchange plate 7 and a second heat exchange plate 8 spaced from each other. The first heat exchange plate 7 and the second heat exchange plate 8 form a clean water flow channel 10 therebetween through a rod support 9. The edges of the first heat exchange plate 7 and the second heat exchange plate 8 are joined by welding. A wastewater flow channel 11 is formed between any two adjacent plate pairs 6. The wastewater flow channel 11 is implemented in a manner that there is no obstructive support in its flow channel. The flow direction of the medium in the clean water flow channel 10 is arranged countercurrently to the flow direction of the medium in the wastewater flow channel 11.

[0021] In this embodiment, the flow directions of the clean water flow channel 10 and the waste water flow channel 11 are countercurrent to each other for heat exchange, increasing the heat exchange efficiency; in this embodiment, the confluence components and baffle components of the clean water flow channel 10 and the waste water flow channel 11 are not shown. The confluence components and baffle components are both prior arts, so this application does not need to limit and show them. This is hereby explained.

[0022] As Figure 1 shown, the waste water inlet 2 and the waste water outlet 3 are located on the same side, that is to say, the waste water inlet 2 and the waste water outlet 3 are located on the right side of the heat exchanger body 1; the clean water inlet 4 and the clean water outlet 5 are located on the same side, that is to say, the clean water inlet 4 and the clean water outlet 5 are located on the left side of the heat exchanger body 1.

[0023] To ensure the actual service life of this embodiment, the thicknesses of the first heat exchange plate 7 and the second heat exchange plate 8 are the same and preferably 2.0 - 3.5 mm.

[0024] As Figure 2 shown, the first heat exchange plate 7 and the second heat exchange plate 8 of each pair of plates 6 are specifically welded to each other and respectively welded to the rod support 9 therebetween. Therefore, the rod support 9 supports the first heat exchange plate 7 and the second heat exchange plate 8 to form a flow channel with a limited width;

[0025] Preferably, the flow channel width of the clean water flow channel 10 is not less than 6 mm.

[0026] To ensure the unobstructed flow of the waste water medium, the flow channel width of the waste water flow channel 11 in this embodiment is not less than 24 mm, which has a larger flow cross-section than the flow channels of traditional heat exchangers and better flow effect.

[0027] This application discloses a special welded wide-flow-channel heat exchanger for pulp mill waste water, adopting an efficient full-countercurrent heat exchange scheme, increasing the flow cross-section widths of the clean water flow channel 10 and the waste water flow channel 11, preventing the precipitation and accumulation of waste water from blocking, and the corresponding maintenance and repair are also more convenient, which can greatly improve the heat exchanger efficiency and service life.

[0028] The above embodiments are not limitations to the present utility model, and the present utility model is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present utility model also belong to the protection scope of the present utility model.

Claims

1. A welded wide-channel heat exchanger for pulp mill wastewater, comprising a heat exchanger body (1), characterized in that: The heat exchanger body (1) comprises a wastewater inlet (2) and a clean water outlet (5) arranged on the same side, and the heat exchanger body (1) also comprises a wastewater outlet (3) and a clean water inlet (4) arranged on another same side. The heat exchanger body (1) comprises a plurality of plate pairs (6) spaced apart from each other. Each group of the plate pairs (6) comprises a first heat exchange plate (7) and a second heat exchange plate (8) spaced apart from each other. The first heat exchange plate (7) and the second heat exchange plate (8) are supported by rods (9) to form a clean water flow channel (10) therebetween. A wastewater flow channel (11) is formed between any two adjacent plate pairs (6). The wastewater flow channel (11) is implemented in a manner where there is no obstruction support in the flow channel. The flow direction of the medium in the clean water flow channel (10) and the flow direction of the medium in the wastewater flow channel (11) are arranged in countercurrent to each other.

2. The welded wide-channel heat exchanger for pulp mill wastewater according to claim 1 is characterized in that: The wastewater inlet (2) and the wastewater outlet (3) are both located on the same cistern; The clean water inlet (4) and the clean water outlet (5) are both located on the same lateral side.

3. The welded wide-channel heat exchanger for pulp mill wastewater according to claim 1 is characterized in that: The thickness of the first heat exchange plate (7) and the second heat exchange plate (8) is the same and is 2.0-3.5 mm.

4. The welded wide-channel heat exchanger for pulp mill wastewater according to claim 1 is characterized in that: The first heat exchange plate (7) and the second heat exchange plate (8) of each group of the plate pairs (6) are welded to each other and are respectively welded to the rod support (9) therebetween.

5. The welded wide-channel heat exchanger for pulp mill wastewater according to claim 1 is characterized in that: The flow channel width of the clean water flow channel (10) is not less than 6 mm.

6. The welded wide-channel heat exchanger for pulp mill wastewater according to claim 1 is characterized in that: The flow channel width of the wastewater flow channel (11) is not less than 24 mm.

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