Hot air circulation closed air curtain device for feed port of side feed stepping furnace

Abstract

The utility model discloses a hot air circulation closed air curtain device for a feed port of a side feed stepping furnace, which solves the problems of poor sealing performance, effective reduction of influence of cold air on local temperature and oxygen content in the furnace and the like in the prior art, and is characterized in that a hot air circulation pipeline (2) is mounted around the feed port by a circle; a nozzle (6) is arranged on the wall face of the inner ring of the hot air circulation pipeline (2), and the hot air circulation pipeline (2) is fixed to the door wall (1) and the vault (4) through castable (5). The flue gas inlet pipeline (3) is arranged on the top (4) and is connected with a flue of tail gas subjected to heat exchange through a heat exchanger through a high-temperature fan, high-temperature flue gas is pumped into the hot air circulating pipeline (2) to be distributed to the periphery and sprayed to a feeding port through the nozzles (6), airflow forms a closed air curtain at the feeding port, and the situation that outside cold air enters the furnace through the feeding port is effectively reduced. The device has the advantages of reasonable structure, convenience in installation, energy conservation, consumption reduction, safety in use and the like, and has a very wide application prospect.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal equipment, and in particular relates to a hot air circulation closed air curtain device for a feeding port of a side-feed walking beam furnace. Background Art

[0002] Walking-beam furnaces are a type of continuous heating equipment commonly used in industry. Side-in, side-out is a loading and unloading method for walking-beam furnaces, offering advantages such as a small door opening, short opening times, and minimal pressure fluctuations when the door is open. However, side-feed walking-beam furnaces typically utilize a lift-type door at the inlet. Due to issues with the door's structure and workmanship, a small gap exists when it is closed, resulting in poor airtightness and allowing cold air to be drawn into the furnace. As this cold air is drawn in, the furnace temperature drops, fuel consumption increases, and this is detrimental to energy conservation. Cold air typically contains oxygen and nitrogen, which can cause a certain degree of oxidative burn damage. Furthermore, at high temperatures, oxygen easily reacts with nitrogen to form nitrogen oxides, increasing pollutant emissions. Utility Model Content

[0003] The purpose of the utility model is to address the airtightness defects of the existing walking furnace feeding port furnace door and provide a side-feed walking furnace feeding port hot air circulation closed air curtain device with scientific structure, convenient installation, energy saving and consumption reduction, and safe use.

[0004] The technical problem solved by this utility model can be achieved using the following technical solution: the utility model comprises side walls, a discharge port, and a feed port, with a hot air circulation duct disposed around the feed port. Nozzles are installed on the inner wall of the hot air circulation duct, which is secured to the door wall and arch using castable material. A flue gas inlet duct is provided on the arch, communicating with the hot air circulation duct disposed around the feed port and then connected to the exhaust flue gas duct after heat exchange in the heat exchanger via a high-temperature fan.

[0005] Furthermore, the nozzle is vertically installed at the air hole provided on the inner wall of the hot air circulation duct, and the hot air circulation duct and the nozzle are made of metal materials with good air tightness and high temperature resistance.

[0006] Furthermore, the castable is poured in a rectangular shape around the hot air circulation pipe cross section.

[0007] Furthermore, the flue gas flow velocity in the flue gas inlet duct, the hot air circulation duct and the nozzle is 8~15m / s.

[0008] The beneficial effects of this utility model are as follows: the nozzle sprays high-temperature flue gas toward the feed inlet, where the flue gas flow mixes and turbulently forms a closed air curtain, effectively blocking the cold air drawn in from the outside through the gap in the furnace door due to the negative pressure at the furnace door. This makes the temperature inside the furnace more uniform, avoids increased fuel consumption due to a drop in the burner head temperature, and reduces the amount of oxygen and nitrogen carried in the cold air entering the furnace, thereby effectively preventing oxidation and burning of the product. At the same time, it increases the recycling of waste heat from the exhaust gas, which has a positive impact on raising the furnace temperature.

[0009] The following structural drawings further illustrate the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the side-feed walking beam furnace structure;

[0011] Figure 2 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0012] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0013] In the figure: 1 is the door wall, 2 is the hot air circulation duct, 3 is the flue gas inlet duct, 4 is the arch, 5 is the castable, 6 is the nozzle, 7 is the feed door, 8 is the discharge door, 9 is the material, and 10 is the side wall.

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely schematic diagrams of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work. DETAILED DESCRIPTION

[0015] like Figure 1 As shown, the feeding and discharging mode of the hot air circulation closed air curtain device of the side-feed walking beam furnace is side-in and side-out, and the feeding port 7 and the discharging port 8 are set on the side wall 10 of the walking beam furnace. Figure 2 As shown, a hot air circulation duct 2 is set around the feed port, and a nozzle 6 is set on the inner wall of the hot air circulation duct 2. The nozzle 6 is vertically installed at the air hole set on the inner wall of the hot air circulation duct 2. The hot air circulation duct 2 and the nozzle 6 are made of metal materials with good air tightness and high temperature resistance. Figure 3 As shown, the hot air circulation pipe 2 is fixed to the door wall 1 and the arch 4 using castable 5. The castable is an amorphous refractory material used to fix the hot air circulation pipe and nozzle to the door wall and the arch. The castable with appropriate specifications and good heat resistance is selected according to the flue gas temperature. When casting and fixing, a rectangular cross section is selected around the pipe, and the outer surface is cast as shown in FIG. Figure 3 Parallel to the door wall surface. The door wall 1 includes door walls parallel to each other on both sides of the feed port and the part of the step furnace side wall below the feed port. The door wall is made of strong, non-breakable, high-temperature resistant refractory bricks. When building the door wall and the arch, positions for pipes and castables are reserved. A flue gas inlet pipe 3 is provided on the arch 4. The lower end of the flue gas inlet pipe 3 is connected to the hot air circulation pipe 2 provided below the arch 4 around the feed port, and the upper end is connected to the exhaust gas flue after heat exchange in the heat exchanger through a high-temperature fan. The flow rate of the flue gas sent into the flue gas inlet pipe 3, the hot air circulation pipe 2 and the nozzle 6 by the high-temperature fan should be 8~15m / s. When implementing the utility model, the high-temperature fan extracts the exhaust gas after heat exchange in the heat exchanger, enters the hot air circulation pipe 2 through the flue gas inlet pipe 3, and the flue gas circulates in the hot air circulation pipe and is sprayed vertically into the feed port by the nozzle 6. Flue gas is ejected from all sides of the feed inlet wall, forming a high-temperature, closed air curtain that blocks cold air drawn into the furnace through gaps in the furnace door. This device boasts a rational structure, easy installation, energy savings, and safety, making it widely applicable to walking beam heating furnaces.

[0016] The above description is only a detailed description of a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are all covered by the scope of the utility model patent.

Claims

1. A side-feed walking beam furnace feed port hot air circulation closed air curtain device, comprising a side wall (10), a discharge port (8) and a feed port (7), characterized in that: A hot air circulation duct (2) is arranged around the feed port (7), a nozzle (6) is arranged on the inner wall of the hot air circulation duct (2), and the hot air circulation duct (2) is fixed to the feed port door wall (1) and the arch (4) using a casting material (5). A flue gas inlet duct (3) is arranged on the arch (4), which is communicated with the hot air circulation duct (2) arranged around the feed port and is connected to the exhaust flue after heat exchange in the heat exchanger through a high-temperature fan.

2. The side-feed walking beam furnace feed inlet hot air circulation closed air curtain device according to claim 1, characterized in that: The nozzle (6) is vertically mounted on the air hole provided on the inner wall of the hot air circulation duct (2). The hot air circulation duct (2) and the nozzle (6) are made of metal materials with good air tightness and high temperature resistance.

3. The side-feed walking beam furnace feed inlet hot air circulation closed air curtain device according to claim 1 or 2, characterized in that: The castable (5) is cast in a rectangular shape around the hot air circulation pipe (2) in cross section.

4. The side-feed walking beam furnace feed inlet hot air circulation closed air curtain device according to claim 3, characterized in that: The flue gas flow velocity in the flue gas inlet duct (3), the hot air circulation duct (2) and the nozzle (6) is 8 to 15 m / s.

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