Plate heat exchanger for recovering exhaust heat for ironmaking

Abstract

The utility model discloses a kind of plate heat exchanger for tail gas heat recovery for ironmaking, including first clamping outer plate, second clamping outer plate and filtering mechanism, first clamping outer plate and second clamping outer plate are mutually parallelly arranged, the utility model relates to ironmaking tail gas recovery technical field.This plate heat exchanger for tail gas heat recovery for ironmaking is set by setting filtering mechanism, the device is set filtering mechanism outside one fluid inlet on the basis of traditional plate heat exchanger, filter screen cylinder is provided in filtering mechanism, when high-temperature tail gas enters filtering mechanism through pipeline, dust etc. Impurity in its interior can not continue to move backward under the block of filter screen cylinder, it can not enter the inside of plate heat exchanger, to this can extend the service life of plate heat exchanger, without high frequency to it cleaning or maintenance operation, reduce the labor burden of staff, production cost is indirectly reduced, to improve the practicability of the device.

Description

Technical Field

[0001] This utility model relates to the field of ironmaking tail gas recovery technology, specifically a plate heat exchanger for recovering heat from ironmaking tail gas. Background Technology

[0002] Iron smelting is the process of extracting metallic iron from iron-containing minerals (mainly iron oxides). The main methods include blast furnace method, direct reduction method, smelting reduction method, and plasma method. From a metallurgical perspective, iron smelting is the reverse process of iron rusting and gradual mineralization. Simply put, it is the reduction of pure iron from iron-containing compounds.

[0003] A plate heat exchanger is a high-efficiency heat exchanger composed of a series of corrugated metal plates stacked together. Thin rectangular channels are formed between the plates, through which heat exchange occurs. Plate heat exchangers are ideal for liquid-liquid and liquid-vapor heat exchange. They feature high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application, and long service life. Under the same pressure loss conditions, their heat transfer coefficient is 3-5 times higher than that of a tubular heat exchanger, their footprint is one-third that of a tubular heat exchanger, and their heat recovery rate can reach over 90%.

[0004] Blast furnace ironmaking produces a large amount of exhaust gas, which is at a high temperature. If it is not utilized, a large amount of heat will be wasted. However, the exhaust gas from blast furnace ironmaking also contains a lot of impurities and dust. If plate heat exchangers are used to treat it directly, a large amount of dust will accumulate inside the plate heat exchangers in a short period of time, requiring frequent cleaning, which is quite inconvenient. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a plate heat exchanger for recovering heat from blast furnace exhaust gas. This solves the problem that the exhaust gas from blast furnace ironmaking contains many impurities and dust. If a plate heat exchanger is used directly to treat these impurities and dust, a large amount of dust will accumulate inside the plate heat exchanger in a short period of time, requiring frequent cleaning, which is inconvenient.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a plate heat exchanger for recovering heat from tail gas in ironmaking, comprising a first clamping outer plate, a second clamping outer plate, and a filter mechanism; the first and second clamping outer plates are arranged parallel to each other, and a plurality of heat transfer plates are detachably installed between the first and second clamping outer plates; two fluid inlets are laterally opened through the upper part of the front surface of the second clamping outer plate, and the filter mechanism is detachably disposed at the outer end of one of the fluid inlets; the filter mechanism includes a main tube, and the lower surface of the main tube... The middle part is connected to an inclined extension tube. The front part of the inner cavity of the main tube is fixedly connected to an inner ring. The rear end of the inner ring is fixedly connected to a filter screen cylinder. The rear part of the filter screen cylinder is bent downward and extends into the interior of the extension tube. A tube cap is detachably installed at the bottom end of the extension tube. An upper plug is fixedly connected to the bottom end inside the tube cap. Multiple rubber sealing rings are fixedly connected to the outer surface of the upper plug. When the tube cap is installed at the bottom end of the extension tube, the upper plug extends to the rear end interior of the filter screen cylinder, and the outer surfaces of the multiple rubber sealing rings are tightly fitted with the inner surface of the filter screen cylinder.

[0007] Furthermore, an activated carbon filter layer is provided at the rear of the inner cavity of the main tube.

[0008] Furthermore, flange rings are fixedly connected to both ends of the main tube, and the filter mechanism is detachably mounted on the front surface of the second clamping outer plate through the flange rings.

[0009] Furthermore, a guide post is horizontally fixedly connected to the upper part of the front surface of the first clamping outer plate, and a through hole corresponding to and adapted to the guide post is horizontally opened on the upper part of the front surface of the second clamping outer plate, and the front end of the guide post extends forward through the through hole.

[0010] Furthermore, each of the heat transfer plates has an extension plate fixedly connected to its top end, and the front surface of each of the extension plates has a transverse through hole adapted to the guide post. The extension plates are slidably connected to the outer surface of the guide post through the through hole.

[0011] Furthermore, two fluid outlets are laterally opened through the bottom of the front surface of the second clamping outer plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This plate heat exchanger for recovering heat from tail gas in ironmaking, by setting up a filtration mechanism, is based on the traditional plate heat exchanger and has a filtration mechanism installed outside one of its fluid inlets. The filtration mechanism contains a filter screen. When high-temperature tail gas enters the filtration mechanism through the pipe, the dust and other impurities inside are blocked by the filter screen and cannot continue to move backward, thus preventing them from entering the interior of the plate heat exchanger. This extends the service life of the plate heat exchanger, eliminates the need for frequent cleaning or maintenance, reduces the workload of workers, indirectly reduces production costs, and thus improves the practicality of the device. Attached Figure Description

[0013] Fig. 1 This is a cross-sectional structural diagram of the present invention;

[0014] Fig. 2 This is a schematic diagram of the filter mechanism of this utility model;

[0015] Fig. 3 This is a schematic diagram of the overall external structure of this utility model.

[0016] In the figure: 1-First clamping outer plate, 2-Second clamping outer plate, 3-Heat transfer plate, 4-Guide column, 5-Through hole, 6-Extension plate, 7-Plate hole, 8-Fluid inlet, 9-Filtration mechanism, 91-Main tube, 92-Inner ring, 93-Filter screen cylinder, 94-Extension tube, 95-Pipe cap, 96-Upper plug, 97-Rubber sealing ring, 98-Activated carbon filter layer, 99-Flange ring, 10-Fluid outlet. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figs. 1-3This utility model provides a technical solution: a plate heat exchanger for recovering heat from tail gas in ironmaking, comprising a first clamping outer plate 1, a second clamping outer plate 2, and a filter mechanism 9; the first clamping outer plate 1 and the second clamping outer plate 2 are arranged parallel to each other, and a plurality of heat transfer plates 3 are detachably installed between the first clamping outer plate 1 and the second clamping outer plate 2; two fluid inlets 8 are laterally opened through the upper part of the front surface of the second clamping outer plate 2, and the filter mechanism 9 is detachably disposed at the outer end of one of the fluid inlets 8; the filter mechanism 9 includes a main tube 91, and an inclined extension tube is connected to the middle part of the lower surface of the main tube 91. The extension tube 94 has an inner ring 92 fixedly connected to the front of the inner cavity of the main tube 91. The filter screen cylinder 93 is fixedly connected to the rear end of the inner ring 92. The rear part of the filter screen cylinder 93 is bent downward and extends into the interior of the extension tube 94. A tube cap 95 is detachably installed at the bottom end of the extension tube 94. An upper plug 96 is fixedly connected to the bottom end of the tube cap 95. Multiple rubber sealing rings 97 are fixedly connected to the outer surface of the upper plug 96. When the tube cap 95 is installed at the bottom end of the extension tube 94, the upper plug 96 extends to the rear end of the filter screen cylinder 93. The outer surfaces of the multiple rubber sealing rings 97 are all tightly fitted with the inner surface of the filter screen cylinder 93.

[0019] The plate heat exchanger structure of this device is basically the same as that of a traditional plate heat exchanger. The outer sides of the first clamping outer plate 1 and the second clamping outer plate 2 are clamped and fixed by screws and nuts, and multiple heat transfer plates 3 between them are fixed by clamping. On this basis, a filter mechanism 9 is set at the outer end of a fluid inlet 8 to filter the ironmaking tail gas.

[0020] The filter mechanism 9 is equipped with a downwardly inclined extension tube 94. A filter screen cylinder 93 is also fixedly connected inside the main tube 91. The rear part of the filter screen cylinder 93 bends and extends into the interior of the extension tube 94. When the high-temperature exhaust gas enters the filter mechanism 9 from the front end, the dust and other impurities mixed in the exhaust gas will be blocked by the filter screen cylinder and guided to its rear end. The gas will continue to flow along the length of the main tube 91 without being affected and eventually enter the interior of the plate heat exchanger. The dust accumulated inside the filter screen cylinder 93 will eventually be blocked by the upper plug block 96. The staff only needs to remove the tube cap 95 periodically to clean the dust inside to ensure the continuous and effective operation of the device.

[0021] An activated carbon filter layer 98 is provided at the rear of the inner cavity of the main tube 91.

[0022] The activated carbon filter layer 98 can absorb toxic and corrosive gases in the exhaust gas, preventing them from corroding the heat transfer plates 3 inside the plate heat exchanger.

[0023] Both ends of the main tube 91 are fixedly connected with flange rings 99, and the filter mechanism 9 is detachably installed on the front surface of the second clamping outer plate 2 through the flange rings 99.

[0024] The structure of flange ring 99 facilitates the installation and disassembly of filter mechanism 9.

[0025] A guide post 4 is horizontally fixedly connected to the upper part of the front surface of the first clamping outer plate 1. A through hole 5 corresponding to and adapted to the guide post 4 is horizontally opened on the upper part of the front surface of the second clamping outer plate 2. The front end of the guide post 4 extends forward through the through hole 5.

[0026] Each of the multiple heat transfer plates 3 has an extension plate 6 fixedly connected to its top end. The front surface of each of the multiple extension plates 6 has a plate hole 7 that is adapted to the guide post 4. The multiple extension plates 6 are slidably connected to the outer surface of the guide post 4 through the plate hole 7.

[0027] The guide post 4 can guide and restrict multiple heat transfer plates 3. When cleaning them regularly, the guide post 4 can prevent multiple heat transfer plates 3 from falling off between the first clamping outer plate 1 and the second clamping outer plate 2, thus improving the convenience of maintenance and cleaning.

[0028] Two fluid outlets 10 are laterally opened at the bottom of the front surface of the second clamping outer plate 2.

[0029] Fluid outlet 10 is used to discharge gas that has entered the device.

[0030] This device, based on a traditional plate heat exchanger, incorporates a filter mechanism 9 outside one of its fluid inlets. The filter mechanism 9 contains a filter screen 93. When high-temperature exhaust gas enters the filter mechanism 9 through a pipe, dust and other impurities inside are blocked by the filter screen 93 and cannot move further backward, thus preventing them from entering the plate heat exchanger. This extends the service life of the plate heat exchanger, eliminates the need for frequent cleaning or maintenance, reduces the workload of workers, indirectly lowers production costs, and improves the practicality of the device.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plate heat exchanger for recovering heat from tail gas in ironmaking, characterized in that: The system includes a first clamping outer plate (1), a second clamping outer plate (2), and a filter mechanism (9). The first clamping outer plate (1) and the second clamping outer plate (2) are arranged parallel to each other. Multiple heat transfer plates (3) are detachably installed between the first clamping outer plate (1) and the second clamping outer plate (2). Two fluid inlets (8) are laterally opened through the upper part of the front surface of the second clamping outer plate (2). The filter mechanism (9) is detachably disposed at the outer end of one of the fluid inlets (8). The filter mechanism (9) includes a main tube (91). An inclined extension tube (94) is connected to the middle part of the lower surface of the main tube (91). The front part of the inner cavity of the main tube (91) is fixedly connected to... An inner ring (92) is connected to the inner ring (92), and a filter cylinder (93) is fixedly connected to the rear end of the inner ring (92). The rear part of the filter cylinder (93) is bent downward and extends into the interior of the extension tube (94). A cap (95) is detachably installed at the bottom end of the extension tube (94). An upper plug (96) is fixedly connected to the bottom end of the inner part of the cap (95). Multiple rubber sealing rings (97) are fixedly connected to the outer surface of the upper plug (96). When the cap (95) is installed at the bottom end of the extension tube (94), the upper plug (96) extends to the rear end of the filter cylinder (93), and the outer surfaces of the multiple rubber sealing rings (97) are tightly fitted to the inner surface of the filter cylinder (93).

2. A plate heat exchanger for recovering heat from tail gas in ironmaking according to claim 1, characterized in that: An activated carbon filter layer (98) is provided at the rear of the inner cavity of the main tube (91).

3. A plate heat exchanger for recovering heat from tail gas in ironmaking according to claim 1, characterized in that: Both ends of the main tube (91) are fixedly connected with flange rings (99), and the filter mechanism (9) is detachably installed on the front surface of the second clamping outer plate (2) through the flange rings (99).

4. A plate heat exchanger for recovering heat from tail gas in ironmaking according to claim 1, characterized in that: The upper part of the front surface of the first clamping outer plate (1) is horizontally fixedly connected to a guide post (4), and the upper part of the front surface of the second clamping outer plate (2) is horizontally opened with a through hole (5) corresponding to and adapted to the guide post (4). The front end of the guide post (4) extends forward through the through hole (5).

5. A plate heat exchanger for recovering heat from tail gas in ironmaking according to claim 4, characterized in that: Each of the heat transfer plates (3) has an extension plate (6) fixedly connected to its top end. The front surface of each of the extension plates (6) is provided with a plate hole (7) that is compatible with the guide post (4). The extension plates (6) are slidably connected to the outer surface of the guide post (4) through the plate hole (7).

6. A plate heat exchanger for recovering heat from tail gas in ironmaking according to claim 1, characterized in that: The bottom of the front surface of the second clamping outer plate (2) has two fluid outlets (10) that are opened laterally.

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