Radiation chamber inlet part water cooling wall structure of flash smelting waste heat boiler

Abstract

The utility model discloses a radiation chamber inlet portion water cooling wall structure of a flash smelting waste heat boiler, which comprises a radiation chamber inlet portion water cooling wall composed of a tube plate type water cooling wall, and the tube plate type water cooling wall is composed of a steel plate and a plurality of heat exchange tubes laid on the outer side face of the steel plate. An anti-abrasion plate blocked in front of the first heat exchange tube at an inlet is arranged at the inlet of the radiation chamber inlet water cooling wall, the inner side face of a steel plate of the tube plate type water cooling wall forms a counter-fire face of the inner side of the radiation chamber inlet water cooling wall, and the counter-fire face of the radiation chamber inlet water cooling wall is a smooth surface. A nichrome film layer and a refractory material layer are sequentially arranged on the counter-fire surface of the water-cooled wall at the inlet part of the radiation chamber in the direction in the boiler, and a refractory material layer is also arranged on the outer side surface of the water-cooled wall at the inlet part of the radiation chamber in the waste heat boiler inlet expansion joint. The utility model has the advantage of long service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to flash smelting waste heat boiler technical field, concretely relates to radiation chamber entrance portion water cooled wall structure of flash smelting waste heat boiler. BACKGROUND

[0002] The radiation chamber entrance portion of flash smelting waste heat boiler is the radiation chamber zooming portion, and the front section of the radiation chamber entrance portion is connected with the flash smelting furnace through the boiler entrance expansion joint, and the flue gas from the smelting furnace first passes through the radiation chamber entrance portion water cooled wall of flash smelting waste heat boiler and then enters the radiation chamber.

[0003] The radiation chamber entrance portion water cooled wall structure currently used generally adopts the membrane type water cooled wall structure that is sequentially and alternately welded by flat steel and heat exchange pipes. The radiation chamber entrance portion water cooled wall structure composed of the membrane type water cooled wall has the following shortcomings: 1) the heat exchange pipes of the radiation chamber entrance portion water cooled wall are directly subjected to the scouring of flue gas, and since the flue gas from the smelting furnace has a high temperature of 1400 DEG C, a high flow rate, strong corrosiveness and high dust content, the metal of the wall of the heat exchange pipes of the radiation chamber entrance portion water cooled wall is prone to overheating and creep in the process of being continuously subjected to the direct scouring of flue gas, thereby reducing the service life of the pipes and affecting the service life of the whole radiation chamber entrance portion water cooled wall; 2) the smelting furnace often has unstable smoke temperature, resulting in the presence of powdery and granular dregs in the flue gas, which causes the wall of the heat exchange pipes of the radiation chamber entrance portion water cooled wall to be abraded and the dust to be bonded, thereby affecting the heat transfer of the water cooled wall. SUMMARY

[0004] The utility model discloses a radiation chamber entrance portion water cooled wall structure of flash smelting waste heat boiler with long service life.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: the radiation chamber entrance portion water cooled wall structure of flash smelting waste heat boiler comprises: a radiation chamber entrance portion water cooled wall composed of a tube sheet type water cooled wall, the tube sheet type water cooled wall is composed of a steel plate and a plurality of heat exchange pipes laid on the outer side of the steel plate, a wear plate is arranged in front of the first heat exchange pipe at the entrance of the radiation chamber entrance portion water cooled wall, the inner side of the steel plate of the tube sheet type water cooled wall constitutes the fire-facing surface of the inner side of the radiation chamber entrance portion water cooled wall, the fire-facing surface of the radiation chamber entrance portion water cooled wall is a smooth surface, a nickel-chromium alloy film layer and a refractory material layer are sequentially arranged in the fire-facing surface of the radiation chamber entrance portion water cooled wall in the direction towards the furnace, and the outer side of the radiation chamber entrance portion water cooled wall in the boiler entrance expansion joint is also provided with a refractory material layer.

[0006] Further, the water-cooled wall structure of the radiation chamber inlet part of the flash smelting waste heat boiler as claimed in the preceding claim, wherein: the tube sheet type water-cooled wall is formed by welding a plurality of tube sheet units, and each tube sheet unit comprises a steel plate and a heat exchange pipe laid on the surface of the steel plate, and a groove is formed at the joint of the adjacent steel plates so that the weld joint of the joint of the steel plates is flush with the surface of the steel plate.

[0007] Further, the water-cooled wall structure of the radiation chamber inlet part of the flash smelting waste heat boiler as claimed in the preceding claim, wherein: a plurality of nails embedded in the refractory layer are welded and fixed on the inner side of the nickel-chromium alloy film and the heat exchange pipe on the outer side of the water-cooled wall of the radiation chamber inlet part in the inlet expansion joint of the waste heat boiler.

[0008] Further, the water-cooled wall structure of the radiation chamber inlet part of the flash smelting waste heat boiler as claimed in the preceding claim, wherein: the steel plate at the inlet of the water-cooled wall of the radiation chamber inlet part is bent to form a wear-resistant plate blocking the front of the first heat exchange pipe at the inlet.

[0009] Further, the water-cooled wall structure of the radiation chamber inlet part of the flash smelting waste heat boiler as claimed in the preceding claim, wherein: the wear-resistant plate is tightly attached to and welded to the first heat exchange pipe at the inlet of the water-cooled wall of the radiation chamber inlet part.

[0010] By implementing the above technical solution, the present application has the following beneficial effects: (1) The water-cooled wall of the radiation chamber inlet part adopts the tube sheet type water-cooled wall structure, and the fire-facing surface is the inner side plane of the steel plate. Since the heat exchange pipe is installed on the outer side of the steel plate, the heat exchange pipe will not be directly washed by the flue gas, effectively avoiding the occurrence of flue gas washing and abrasion of the heat exchange pipe and flue gas sticking, not only effectively protecting the heat exchange pipe and prolonging the service life of the heat exchange pipe, but also prolonging the service life of the water-cooled wall of the radiation chamber inlet part as a whole, without affecting the heat transfer effect of the water-cooled wall of the radiation chamber inlet part and ensuring the heat transfer efficiency; (2) The fire-facing surface of the water-cooled wall of the radiation chamber inlet part is designed to be plated and cast with refractory material, which improves the wear resistance of the fire-facing surface of the water-cooled wall of the radiation chamber inlet part, effectively alleviates the washing and abrasion of the flue gas on the fire-facing surface of the water-cooled wall of the radiation chamber inlet part and high-temperature corrosion, and further improves the service life of the water-cooled wall of the radiation chamber inlet part; (3) The first heat exchange pipe at the inlet is protected against wear, further preventing the heat exchange pipe from being directly contacted with the flue gas, and further improving the service life of the water-cooled wall of the radiation chamber inlet part. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The figure is a schematic view of the position of the water-cooled wall of the radiation chamber inlet part in the flash smelting waste heat boiler.

[0012] Figure 2 The figure is a structural schematic view of the water-cooled wall of the radiation chamber inlet part composed of the tube sheet type water-cooled wall.

[0013] Figure 3This is a schematic diagram of the water-cooled wall structure at the inlet of the radiant chamber of the flash smelting waste heat boiler described in this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 , Figure 2 , Figure 3 As shown, the water-cooled wall structure at the inlet of the radiant chamber of the flash smelting waste heat boiler includes: a water-cooled wall 100 at the inlet of the radiant chamber 300 of the flash smelting waste heat boiler 200, which is composed of a tube sheet water-cooled wall. The tube sheet water-cooled wall is composed of a steel plate 1 and a plurality of heat exchange tubes 2 laid flat on the outer side of the steel plate 1. A first heat exchange tube is provided at the inlet of the water-cooled wall 100 to block the inlet. In this embodiment, the wear-resistant plate 3 in front of the heat pipe is formed by bending the steel plate 1 at the inlet of the water-cooled wall 100 at the radiant chamber entrance into a wear-resistant plate 3 that blocks the first heat exchange tube at the inlet. The wear-resistant plate 3 is tightly fitted and welded to the first heat exchange tube at the inlet of the water-cooled wall 100 at the radiant chamber entrance. The inner side of the steel plate of the tube-plate water-cooled wall constitutes the fire-facing surface of the inner side of the water-cooled wall 100 at the radiant chamber entrance. The fire-facing surface of the water-cooled wall 100 at the radiant chamber entrance is a smooth surface. In this embodiment, the tube sheet water-cooled wall is assembled and welded from several tube sheet units. Each tube sheet unit includes a steel plate and a heat exchange tube laid flat on the surface of the steel plate. A bevel is opened at the splice of adjacent steel plates so that the weld at the splice of the steel plates can be flush with the surface of the steel plate. A nickel-chromium alloy film layer 4 and a refractory material layer 5 are sequentially provided on the fire-facing side of the water-cooled wall 100 at the inlet of the radiant chamber and the furnace-facing side. A refractory material layer 5 is also cast on the outer side of the water-cooled wall 100 at the inlet of the radiant chamber located in the expansion joint of the waste heat boiler. The refractory material layers are all made of refractory materials commonly available on the market. Several clamping nails 6 embedded in the refractory material layer are welded and fixed on the inner side of the nickel-chromium alloy film 4 and the outer side of the water-cooled wall 100 at the inlet of the radiant chamber located in the expansion joint of the waste heat boiler. The clamping nails 6 can make the refractory material layer more firmly set on the water-cooled wall 100 at the inlet of the radiant chamber and prevent it from being eroded and falling off by flue gas.

[0016] The utility model discloses the advantages are: (1) the water cooled wall structure of the water cooled wall of radiation chamber entrance part adopts the pipe plate, and its fire face is the inside plane of steel plate, and since the heat exchange pipe is installed on the outside surface of steel plate, the heat exchange pipe will not be directly washed by flue gas, effectively avoids the occurrence of the flue gas scouring and wearing of heat exchange pipe and the flue gas adhesion condition, not only effectively protects the heat exchange pipe, prolongs the service life of heat exchange pipe, and further prolongs the service life of the whole water cooled wall of radiation chamber entrance part, and will not make the heat transfer effect of the water cooled wall of radiation chamber entrance part be influenced, guarantees the heat transfer efficiency, (2) the fire face of the water cooled wall of radiation chamber entrance part is plated and pours the design of refractory material, improves the wear resistance of the fire face of the water cooled wall of radiation chamber entrance part, effectively alleviates the scouring and wearing of flue gas to the fire face of the water cooled wall of radiation chamber entrance part and high temperature corrosion, further improves the service life of the water cooled wall of radiation chamber entrance part, (3) the first heat exchange pipe of the entrance carries out the wear protection, further prevents the heat exchange pipe from directly contacting with flue gas, and further improves the service life of the water cooled wall of radiation chamber entrance part.

[0017] The above only is the preferred embodiment of the utility model, is not any other form's limit to the utility model, and any modification or equivalent change made according to the technical essence of the utility model still belongs to the range of the utility model claimed to protect.

Claims

1. The water-cooled wall structure at the inlet of the radiant chamber of a flash smelting waste heat boiler, characterized in that: include: The radiant chamber inlet water-cooled wall is composed of a tube sheet water-cooled wall, which consists of a steel plate and several heat exchange tubes laid flat on the outer side of the steel plate. At the inlet of the radiant chamber inlet water-cooled wall, an anti-wear plate is provided in front of the first heat exchange tube at the inlet. The inner side of the steel plate of the tube sheet water-cooled wall forms the fire-facing surface of the inner side of the radiant chamber inlet water-cooled wall. The fire-facing surface of the radiant chamber inlet water-cooled wall is a smooth surface. A nickel-chromium alloy film layer and a refractory material layer are sequentially provided on the fire-facing surface of the radiant chamber inlet water-cooled wall in the direction of furnace inlet. A refractory material layer is also provided on the outer side of the radiant chamber inlet water-cooled wall located in the expansion joint at the inlet of the waste heat boiler.

2. The water-cooled wall structure at the inlet of the radiant chamber of the flash smelting waste heat boiler according to claim 1, characterized in that: Tube sheet type water-cooled wall is made up of several tube sheet units assembled and welded together. A tube sheet unit includes a steel plate and a heat exchange tube laid flat on the surface of the steel plate. A bevel is opened at the splice of adjacent steel plates so that the weld at the splice of the steel plates can be flush with the surface of the steel plate.

3. The water-cooled wall structure at the inlet of the radiant chamber of the flash smelting waste heat boiler according to claim 1 or 2, characterized in that: Several rivets embedded in the refractory material layer are welded and fixed on the inner side of the nickel-chromium alloy film and on the outer side of the water-cooled wall at the inlet of the radiant chamber located in the expansion joint at the inlet of the waste heat boiler.

4. The water-cooled wall structure at the inlet of the radiant chamber of the flash smelting waste heat boiler according to claim 1, characterized in that: The steel plate at the entrance of the water-cooled wall of the radiation chamber is bent to form an anti-wear plate in front of the first heat exchange tube at the entrance.

5. The water-cooled wall structure at the inlet of the radiant chamber of the flash smelting waste heat boiler according to claim 4, characterized in that: The abrasion plate is attached tightly and welded to the first heat exchange tube at the inlet of the water-cooled wall at the entrance of the radiation chamber.

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