Corrosion-resistant blast furnace gas heat exchanger

Abstract

The utility model discloses an anti-corrosion blast furnace gas heat exchanger which comprises a heat exchanger body, a gas inlet and a gas outlet are formed in the two ends of the heat exchanger body respectively, an anti-corrosion inner container is arranged on the inner wall of the gas inlet, and a fixing bolt is arranged between the anti-corrosion inner container and the gas inlet. A heat exchanger is arranged on the inner wall of the heat exchanger body. According to the anti-corrosion blast furnace gas heat exchanger, gas firstly makes contact with the anti-corrosion inner container, the gas flow direction is dispersed through the ventilation opening, and after gas flow division, the gas makes contact with the conical spiral heat exchange pipe or flows along with the inner wall of the heat exchanger body, makes contact with the heat exchange pipe and finally flows out of the gas outlet. The contact area of the gas flow and the heat exchange pipe is increased, so that the contact area of the gas heat exchange pipe is increased, and the heat exchange efficiency and the heat utilization rate are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of blast furnace gas heat exchanger, specifically relates to a blast furnace gas heat exchanger of corrosion resistance. BACKGROUND

[0002] At present, blast furnace gas heat exchanger is widely used in blast furnace hot blast stove gas preheating due to good heat exchange effect, simple structure and remarkable heat exchange economic benefit.

[0003] The blast furnace gas heat exchanger provided in the application number CN202022551578.X improves the heat utilization rate and corrosion resistance by setting the corrosion-proof inner liner in the gas inlet, but in the above application, the gas directly enters the inside of the heat exchanger after passing through the corrosion-proof inner liner, and the shape of the heat exchange pipe is relatively single, the contact area with the gas is relatively small, and it is difficult to ensure the conversion efficiency, which is not conducive to use.

[0004] Therefore, the above technical problems should be solved to improve the heat exchange efficiency and heat utilization rate of the existing heat exchanger. UTILITY MODEL CONTENTS

[0005] The utility model discloses a blast furnace gas heat exchanger of corrosion resistance to solve the problem that the contact area of heat exchange pipe and gas is relatively small and is difficult to guarantee conversion efficiency.

[0006] To achieve the above object, the utility model provides the following technical scheme: a blast furnace gas heat exchanger of corrosion resistance, including the heat exchanger body, the both ends of heat exchanger body are provided with gas inlet and gas outlet respectively, the inner wall of gas inlet is provided with the anticorrosive inner bag, the anticorrosive inner bag with fixed bolt is provided between gas inlet, the inner wall of heat exchanger body is provided with heat exchange pipe;

[0007] One end of anticorrosive inner bag is provided with connecting wall, the one end of anticorrosive inner bag opposite connecting wall is provided with lug, the lug is provided with vent hole, the vent hole is the circular truncated cone shape that gradually contracts from big to small.

[0008] Preferably, the connecting wall is provided with a sealing strip, the port of the gas inlet is provided with a mounting groove, the connecting wall is movably installed in the mounting groove, a slot is arranged in the mounting groove, and the sealing strip is movably connected with the slot.

[0009] Preferably, the sealing strip is composed of an arc-shaped block and a rectangular block, the rectangular block is movably installed on the inner wall of the slot, and the arc-shaped block is movably connected with the inner wall of the mounting groove.

[0010] Preferably, the heat exchange pipe is symmetrically arranged in a conical spiral shape, and the heat exchange pipe is respectively provided with a liquid inlet and a liquid outlet, and one end of the liquid inlet and the liquid outlet extends to the outside of the heat exchanger body.

[0011] Preferably, flanges are arranged at the ports of the gas inlet and the gas outlet, and the anticorrosion liner is made of glass fiber reinforced plastic.

[0012] Preferably, the outer wall of the heat exchange pipe is provided with an anticorrosion heat conduction layer.

[0013] The technical effect and advantages of the present application are as follows: when the gas flows through the gas inlet, the gas flows through the anticorrosion liner of the inner wall of the gas inlet, and the flow direction of most of the gas is collected near the axis of the heat exchange pipe through the inclined air vent, and a small part of the gas flow contacts the outer wall of the heat exchange pipe near the middle part, after the gas is branched, the gas contacts the conical spiral heat exchange pipe, and flows along the inner wall of the heat exchanger body, and finally flows out from the gas outlet, by increasing the contact area between the gas flow and the heat exchange pipe, the contact area of the gas heat exchange pipe is increased, and the heat exchange efficiency and the utilization rate of heat are improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional structure schematic view of the present application;

[0015] Figure 2 It is a heat exchange pipe structure schematic view of the present application;

[0016] Figure 3 It is a cross-sectional structure schematic view of the present application;

[0017] Figure 4 It is an anticorrosion liner installation schematic view of the present application.

[0018] In the drawing: 1, heat exchanger body; 2, gas inlet; 3, gas outlet; 4, anticorrosion liner; 5, fixing bolt; 6, heat exchange pipe; 7, connecting wall; 8, sealing strip; 9, installation groove; 10, slot; 11, arc block; 12, rectangular block; 13, protruding block; 14, air vent; 15, liquid inlet; 16, liquid outlet; 17, flange. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] The present application providesFigures 1-4 The application discloses an anti-corrosion blast furnace gas heat exchanger, which comprises a heat exchanger body 1, an air inlet 2 and an air outlet 3 arranged at two ends of the heat exchanger body 1 respectively, an anti-corrosion inner container 4 arranged on the inner wall of the air inlet 2, a fixing bolt 5 arranged between the anti-corrosion inner container 4 and the air inlet 2, and a heat exchange pipe 6 arranged on the inner wall of the heat exchanger body 1. Flanges 17 are arranged at the ports of the air inlet 2 and the air outlet 3, and the anti-corrosion inner container 4 is made of glass fiber reinforced plastic. The output end of blast furnace gas is connected with the air inlet 2, heat exchange medium circulating equipment is connected with the heat exchange pipe through an inlet 15 and an outlet 16, and a heat preservation layer is arranged on the heat exchanger body, so as to reduce the influence of external temperature on the internal temperature of the heat exchanger body. The heat preservation layer can be made of glass wool or other temperature-resistant and heat-insulating materials. When the blast furnace gas flows through the air inlet 2, the blast furnace gas passes through the anti-corrosion inner container 4 on the inner wall of the air inlet 2. An air vent with a gradually inwardly-contracted outer wall is arranged at one end of the anti-corrosion inner container 4. Most of the flow direction of the blast furnace gas is collected near the axis of the heat exchange pipe 6 through the air vent with the inclined outer wall. A small part of the blast furnace gas contacts the outer wall of the heat exchange pipe 6 near the middle part and flows along the inner wall of the heat exchanger body 1. After contacting the heat exchange pipe 6 near the air outlet 3, the blast furnace gas flows out of the heat exchanger body 1 from the outside of the air outlet 3. By increasing the contact area of the blast furnace gas and the heat exchange pipe 6, the contact area of the blast furnace gas heat exchange pipe 6 is increased, and the heat exchange efficiency and the heat utilization rate are improved.

[0021] Specifically, one end of the anti-corrosion inner container 4 is provided with a connecting wall 7, the connecting wall 7 is provided with a sealing strip 8, the port of the air inlet 2 is provided with a mounting groove 9, the connecting wall 7 is movably arranged in the mounting groove 9, the mounting groove 9 is provided with a slot 10, and the sealing strip 8 is movably connected with the slot 10. The sealing strip 8 is composed of an arc-shaped block 11 and a rectangular block 12, the rectangular block 12 is movably arranged on the inner wall of the slot 10, and the arc-shaped block 11 is movably connected with the inner wall of the mounting groove 9. One end of the anti-corrosion inner container 4 relative to the connecting wall 7 is provided with a protruding block 13, the protruding block 13 is provided with an air vent 14, and the air vent 14 is a circular truncated cone with gradually-contracted diameter from large to small. Figure 2 、 4As shown, the anticorrosion liner 4 can be fixed at the port of the gas inlet 2 through the connecting wall 7, a protrusion 13 is arranged on one side of the anticorrosion liner 4, after the gas enters the anticorrosion liner 4, the gas can enter the inside of the heat exchanger body 1 through the air hole 14 arranged on the protrusion 13, the air hole 14 plays a guiding role for the flow direction of the gas, and the anticorrosion liner 4 is made of glass fiber reinforced plastic material, which is used to cope with the high temperature of the gas and the corrosive substances contained therein, so as to avoid the corrosion of the gas inlet caused by the low preheating temperature of the medium at the gas inlet; in the installation of the anticorrosion liner 4, the sealing strip 8 on the connecting wall 7 is extruded and deformed, the rectangular block 12 will be tightly attached to the inner wall of the groove, the arc-shaped block 11 is extruded and tightly attached to the inner wall of the mounting groove 9, and a sealed state is formed, and the anticorrosion liner 4 can be fixed through the fixing bolt 5, as the depth of the fixing bolt 5 penetrating through the connecting wall 7 and extending to the flange plate 17 is deeper, the extrusion force of the arc-shaped block 11 is stronger, and the sealing degree is also improved, after the installation of the anticorrosion liner 4, the corrosion of the gas inlet 2 caused by the direct gas flow to the inner wall of the gas inlet 2 can be avoided, and the anticorrosion liner 4 can be easily repaired, adjusted or replaced by simply disassembling the fixing bolt 5, which is convenient to use.

[0022] Specifically, the heat exchange pipe 6 is symmetrically arranged in a conical spiral shape, the heat exchange pipe 6 is respectively provided with an inlet 15 and an outlet 16, and one end of the inlet 15 and the outlet 16 extends to the outside of the heat exchanger body 1. The outer wall of the heat exchange pipe 6 is provided with an anticorrosion heat conduction layer. For reference Figure 3 As shown, the heat exchange pipe 6 is located in the inside of the heat exchanger body 1, in order to guarantee the service life of the heat exchange pipe 6, the heat exchange pipe 6 is coated with an anticorrosion heat conduction layer, which can cope with the corrosive substances and ensure the heat conduction speed, and the heat exchange pipe 6 is in a two-cone spiral shape, the diameter distance between the spirals decreases from large to small and then increases, the different diameter spirals increase the contact area between the heat exchange pipe 6 and the gas flow, thereby improving the heat exchange efficiency and heat utilization rate of the heat exchange pipe 6.

[0023] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A corrosion-resistant blast furnace gas heat exchanger, characterized in that: The heat exchanger body (1) includes an air inlet (2) and an air outlet (3) at its two ends. The inner wall of the air inlet (2) is provided with a corrosion-resistant inner liner (4). A fixing bolt (5) is provided between the corrosion-resistant inner liner (4) and the air inlet (2). The inner wall of the heat exchanger body (1) is provided with a heat exchange tube (6). One end of the anti-corrosion inner liner (4) is provided with a connecting wall (7), and the end of the anti-corrosion inner liner (4) opposite to the connecting wall (7) is provided with a protrusion (13). The protrusion (13) is provided with a vent hole (14), and the vent hole (14) is a frustum shape that gradually shrinks from large to small.

2. The corrosion-resistant blast furnace gas heat exchanger according to claim 1, characterized in that: A sealing strip (8) is provided on the connecting wall (7), and an installation groove (9) is provided at the port of the air inlet (2). The connecting wall (7) is movably installed in the installation groove (9), and a slot (10) is provided in the installation groove (9). The sealing strip (8) is movably connected to the slot (10).

3. The corrosion-resistant blast furnace gas heat exchanger according to claim 2, characterized in that: The sealing strip (8) is composed of an arc-shaped block (11) and a rectangular block (12). The rectangular block (12) is movably installed on the inner wall of the slot (10), and the arc-shaped block (11) is movably connected to the inner wall of the mounting groove (9).

4. The corrosion-resistant blast furnace gas heat exchanger according to claim 3, characterized in that: The heat exchange tube (6) is a symmetrically arranged conical spiral. The heat exchange tube (6) is provided with an inlet (15) and an outlet (16). One end of the inlet (15) and the outlet (16) extends to the outside of the heat exchanger body (1).

5. A corrosion-resistant blast furnace gas heat exchanger according to claim 1, characterized in that: Flanges (17) are provided at the ports of the air inlet (2) and the air outlet (3), and the anti-corrosion inner liner (4) is made of fiberglass.

6. The corrosion-resistant blast furnace gas heat exchanger according to claim 1, characterized in that: The outer wall of the heat exchange tube (6) is provided with an anti-corrosion and heat-conducting layer.

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