Downstream and countercurrent multi-return combined high-temperature heat exchanger

Abstract

The utility model discloses a cocurrent and countercurrent multi-return combined high-temperature heat exchanger which comprises a hot fluid channel, a hot fluid inlet, a hot fluid outlet, a hot fluid inlet and a hot fluid outlet. An inlet of the cold fluid channel enters from the side edge of the starting end of the hot fluid channel, forms a high-temperature heat exchange section with the hot fluid channel, is transmitted to the side edge of the tail end of the hot fluid channel through the cold fluid downstream channel to enter, and forms a low-temperature heat exchange section with the hot fluid channel. And a medium-temperature heat exchange section is formed through countercurrent transmission of the cold fluid countercurrent channel and multi-return-stroke countercurrent heat exchange of the middle section of the hot fluid channel, and is led out from an outlet of the cold fluid channel. The heat exchanger has the advantages of a countercurrent heat exchange mode and a downstream heat exchange mode, and the heat exchange effect is taken into account while safe temperature operation of the heat exchanger is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchanger technical field especially is a kind of combined high temperature heat exchanger of flow and counter flow multi-return stroke. BACKGROUND

[0002] Current environmental protection requirement is higher and higher, combustion is the most commonly used and relatively clean way in waste gas treatment, however, fuel cost is necessary to be considered by using combustion, and it is a common way to save cost by using heat exchanger to preheat waste gas or combustion-supporting air needing to be treated, but the temperature of hot fluid entering heat exchanger from furnace or other front process section under part working condition can exceed 1000 DEG C, and waste gas or combustion-supporting air needing to be preheated is higher and higher, and it is normal to about 550 DEG C, under this working condition, conventional heat exchanger cannot withstand such high temperature, and the damage rate of equipment is greatly improved. SUMMARY

[0003] The utility model discloses a kind of combined high temperature heat exchanger of flow and counter flow multi-return stroke, and the heat exchanger has the respective advantages of two heat exchange forms of counter flow and flow, ensure that heat exchanger safe temperature operation also consider heat exchange effect simultaneously.

[0004] Technical scheme: the combined high temperature heat exchanger of flow and counter flow multi-return stroke disclosed by the utility model, comprising:

[0005] Hot fluid passage, by hot fluid import axial flow to hot fluid export and pass through heat exchanger;

[0006] Cold fluid passage, cold fluid passage import is entered by hot fluid passage beginning end side, and high-temperature heat exchange section is formed with hot fluid passage, and is transmitted to hot fluid passage end side by cold fluid flow passage, and low-temperature heat exchange section is formed with hot fluid passage, and middle-temperature heat exchange section is formed by cold fluid counter flow passage counter current transmission and hot fluid passage middle section multi-return stroke counter current heat exchange, again by cold fluid passage export.

[0007] Further, the hot fluid passage and cold fluid passage are fixed to form integral structure by rigid frame and outer sealing plate.

[0008] Further, the hot fluid passage and cold fluid passage are filled with heat preservation material between rigid frame.

[0009] Further, the cold fluid counter flow passage is parallel to the hot fluid passage.

[0010] Further, the middle-temperature heat exchange section is provided with multiple sections.

[0011] Further, the high-temperature heat exchange section adopts wave node cylinder heat exchange structure;The middle-temperature heat exchange section and low-temperature heat exchange adopt plate type heat exchange structure.

[0012] Beneficial effects: Compared with the prior art, the advantages of this utility model are as follows: the cold fluid first enters the high-temperature heat exchange section in a co-current manner. At this time, the temperature of these two parts will no longer be the highest (process temperature 1000℃, cold fluid temperature is room temperature). The room temperature cold fluid and the high-temperature hot fluid directly exchange heat, which greatly reduces the average temperature of the heat exchange components, forming an effect similar to cold air protection and avoiding equipment damage. At the same time, the cold fluid then enters the low-temperature heat exchange section through the cold fluid co-current channel and exchanges heat in a counter-current manner, ensuring the heat exchange effect of the heat exchanger. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 The dual-flow, multi-pass combined high-temperature heat exchanger shown includes:

[0016] Hot fluid channel 1 flows axially from hot fluid inlet 101 to hot fluid outlet 102 through the heat exchanger;

[0017] The cold fluid channel 2 and the cold fluid channel inlet 201 enter from the side of the beginning of the hot fluid channel 1 and form a high-temperature heat exchange section 3 with the hot fluid channel 1. The cold fluid is then transferred through the cold fluid co-current channel 202 to the side of the end of the hot fluid channel 1 and form a low-temperature heat exchange section 4 with the hot fluid channel 1. The cold fluid is then transferred through the cold fluid counter-current channel 203 and forms a medium-temperature heat exchange section 5 with the multi-pass counter-current heat exchange in the middle section of the hot fluid channel 1. Finally, the cold fluid is discharged from the cold fluid channel outlet 204.

[0018] The cold fluid first enters the high-temperature heat exchange section 3 in a co-current heat exchange manner, where the room-temperature cold fluid and the high-temperature hot fluid directly exchange heat, greatly reducing the average temperature of the heat exchange components and creating a cold air protection effect to prevent equipment damage. Then, it enters the low-temperature heat exchange section 4 through the cold fluid co-current channel 202. The cold fluid then undergoes heat exchange in a counter-current heat exchange manner, and exits the heat exchanger through the medium-temperature heat exchange section 5 via the cold fluid counter-current channel 203 to complete the heat exchange and ensure the heat exchange effect.

[0019] The hot fluid channel 1 and the cold fluid channel 2 are fixed together by a rigid frame 6 and an outer sealing plate 7 to form an integral structure, ensuring that they are independent of each other and do not cross-contaminate. Thermal insulation material 8 is filled between the hot fluid channel 1 and the cold fluid channel 2 and the rigid frame 6.

[0020] The cold fluid counter-flow channel 203 is placed side-by-side with the hot fluid channel 1. The medium-temperature heat exchange section 5 is configured in multiple sections based on operating conditions, temperature, and structure.

[0021] The high-temperature heat exchange section 3 adopts a wave node cylinder heat exchange structure. For the specific structure, reference can be made to the effective patent of the applicant, Patent No. 201820756518.1, and the name is a combined high-temperature heat exchanger.

[0022] The medium-temperature heat exchange section 5 and the low-temperature heat exchange section 4 adopt a plate heat exchange structure. For the specific structure, reference can be made to the effective patent of the applicant, Patent No. 200910035417.0, and the name is a gas phase plate heat exchanger.

Claims

1. A high temperature heat exchanger of combined co-current and counter-current multi-pass, characterized in that, It comprises: a hot fluid passage (1) which is penetrated by a hot fluid inlet (101) axially and sequentially to a hot fluid outlet (102) through a heat exchanger; a cold fluid passage (2) which is entered by a cold fluid passage inlet (201) from a side edge of a beginning end of the hot fluid passage (1) to form a high-temperature heat exchange section (3) with the hot fluid passage (1) and is transmitted to a side edge of an end of the hot fluid passage (1) through a cold fluid sequential passage (202) to form a low-temperature heat exchange section (4) with the hot fluid passage (1) and is transmitted in a reverse flow through a cold fluid reverse flow passage (203) to form a medium-temperature heat exchange section (5) with the hot fluid passage (1) in a multi-pass reverse flow heat exchange in a middle section and is then transmitted out through a cold fluid passage outlet (204).

2. The combined counter-flow and multi-pass high temperature heat exchanger according to claim 1, characterized in that: The hot fluid passage (1) and the cold fluid passage (2) are fixed to form an integral structure by a rigid frame (6) and an outer sealing plate (7).

3. The combined counter-flow and multi-pass high temperature heat exchanger according to claim 2, characterized in that: The hot fluid passage (1) and the cold fluid passage (2) are filled with a heat preservation material (8) between the hot fluid passage (1) and the cold fluid passage (2) and the rigid frame (6).

4. The combined counter-flow and multi-pass high temperature heat exchanger of claim 1, wherein: The cold fluid reverse flow passage (203) is in parallel and adhered to the hot fluid passage (1).

5. The combined counter-flow and multi-pass high temperature heat exchanger of claim 1, wherein: The medium-temperature heat exchange section (5) is provided with multiple sections.

6. The combined counter-current and multi-pass high temperature heat exchanger of claim 1, wherein: The high-temperature heat exchange section (3) adopts a wave node cylinder heat exchange structure; the medium-temperature heat exchange section (5) and the low-temperature heat exchange section (4) adopt a plate heat exchange structure.

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