Gas heat preservation furnace

Abstract

The utility model discloses a gas heat preservation furnace which comprises a furnace body, a combustion system and a heat recovery barrel, the side edge of the heat recovery barrel is connected with an induced draft fan through a smoke exhaust pipe, the top of the heat recovery barrel is connected with an air pipe through a one-way valve, and a spiral pipe is installed in the heat recovery barrel. The top end of the spiral pipe communicates with the interior of the air pipe through a one-way valve, and the bottom end of the spiral pipe extends into a hearth of the furnace body. By arranging the heat recovery barrel, flue gas generated by combustion in the furnace firstly passes through the heat recovery barrel and exchanges heat with cold air in the spiral pipe when being discharged, waste heat in waste gas is effectively recovered to preheat combustion-supporting air, and high-temperature combustion-supporting air absorbing stored heat can enter the burner to participate in combustion. Energy recycling is formed, and heat efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to gas-fired heat-insulating furnaces. Background Technology

[0002] Gas-fired heat preservation furnaces use natural gas as fuel to generate heat through combustion to maintain the temperature of molten aluminum. They typically consist of a furnace body, a combustion system, and a control system. The furnace body is the main structure of the heat preservation furnace and is used to contain the molten aluminum. The combustion system is responsible for burning natural gas to generate heat. The control system is used to monitor and regulate the temperature inside the furnace.

[0003] Currently, combustion of gas produces flue gas, which contains a lot of heat. However, existing gas-fired heating furnaces are unable to effectively utilize the waste heat in the flue gas, resulting in low heat utilization efficiency and a certain amount of energy waste.

[0004] Therefore, we propose a gas-fired heat preservation furnace to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a gas-fired heat preservation furnace to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A gas-fired heat preservation furnace includes a furnace body, a combustion system, and a heat recovery tank. The heat recovery tank is connected to an induced draft fan via a flue pipe on its side, and an air pipe is connected to the top of the heat recovery tank via a one-way valve. A spiral tube is installed inside the heat recovery tank, and the top end of the spiral tube is connected to the inside of the air pipe via a one-way valve. The bottom end of the spiral tube extends into the furnace chamber of the furnace body.

[0008] In a further embodiment, the combustion system includes a pressure reducing valve, a gas flow meter, a gas valve, and a burner connected in sequence by pipes, with the burner extending into the furnace chamber of the furnace body and connected to the bottom end of the spiral tube.

[0009] In a further embodiment, the outer wall of the heat recovery tank is connected with an insulation layer.

[0010] In a further embodiment, the soup inlet on the upper front side of the stove body is covered with a heat-insulating cover.

[0011] In a further embodiment, a material hopper is provided above the rear side of the furnace body.

[0012] In a further embodiment, an aluminum liquid temperature probe is also installed on the upper front side of the furnace body.

[0013] In a further embodiment, a thermocouple is also installed inside the furnace chamber of the furnace body.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention incorporates a heat recovery tank, allowing the flue gas generated during combustion in the furnace to pass through the tank before being discharged. This heat exchange occurs with the cold air in the spiral tube, effectively recovering residual heat from the exhaust gas and preheating the combustion air. The high-temperature combustion air, after absorbing and storing the heat, can then enter the burner to participate in combustion, forming an energy cycle and improving thermal efficiency. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the left side view of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the combustion system of this utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the heat recovery tank of this utility model.

[0020] In the diagram: 1. Furnace body; 2. Combustion system; 21. Pressure reducing valve; 22. Gas flow meter; 23. Gas valve; 24. Burner; 3. Heat recovery tank; 31. Air pipe; 32. Check valve; 33. Spiral tube; 34. Insulation layer; 4. Exhaust pipe; 5. Exhaust fan; 6. Insulation cover; 7. Feed hopper; 8. Aluminum liquid temperature probe; 9. Thermocouple. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] 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.

[0024] Please see Figure 1-4 A gas-fired heat preservation furnace includes a furnace body 1, a combustion system 2, and a heat recovery tank 3. The furnace body 1 contains a furnace chamber, on which a crucible (not shown) is placed for storing molten aluminum. The combustion system 2 is located on the side of the furnace body 1, and the heat recovery tank 3 is mounted on the combustion system 2. A flue pipe 4 is connected to the side of the heat recovery tank 3, and an induced draft fan 5 is connected to the flue pipe 4. The heat recovery tank 3 connects to the interior of the furnace chamber, allowing the flue gas to be guided out by the induced draft fan 5. An air pipe 31 is connected to the top of the heat recovery tank 3 via a one-way valve 32. A spiral tube 33 is installed inside the heat recovery tank 3, and the spiral tube 33... The top end of the spiral tube 33 is connected to the inside of the air pipe 31 via a one-way valve 32, and the bottom end of the spiral tube 33 extends into the furnace chamber of the furnace body 1. When the flue gas is drawn away, the pressure inside the furnace chamber decreases, and air is automatically replenished into the furnace chamber through the spiral tube 33, the one-way valve 32, and the air pipe 31. When the flue gas passes through the heat recovery tank 3, the contact area with the spiral tube 33 is large. The spiral tube 33 is made of a metal material with a high thermal conductivity, so that the cold air inside the spiral tube 33 can exchange heat with the flue gas and fully recover the heat in the flue gas. The heated air can then enter the furnace chamber and participate in combustion, improving thermal efficiency.

[0025] Combustion system 2 includes a pressure reducing valve 21, a gas flow meter 22, a gas valve 23, and a burner 24 connected in sequence by pipes. The inlet end of pressure reducing valve 21 is connected to an external gas supply device, which is not shown in the figure. After the gas is regulated by pressure reducing valve 21 and metered by gas flow meter 22, it enters burner 24 through gas valve 23. Burner 24 extends into the furnace chamber of furnace body 1, and the bottom end of spiral tube 33 is connected to burner 24 so that high-temperature combustion air after absorbing stored heat can enter burner 24 to participate in combustion.

[0026] Specifically, in order to improve the utilization of waste heat from flue gas, an insulation layer 34 is connected around the outer wall of the heat recovery tank 3 to reduce heat loss to the outside.

[0027] A heat-insulating cover 6 is placed on the upper front opening of the furnace body 1 to keep the molten aluminum in the crucible warm.

[0028] A material hopper 7 is provided on the upper rear side of the furnace body 1, which facilitates the addition of materials.

[0029] An aluminum liquid temperature probe 8 is also installed on the upper front side of the furnace body 1, which directly detects the temperature of the aluminum liquid.

[0030] A thermocouple 9 is also installed inside the furnace chamber of the furnace body 1 to monitor the internal temperature of the furnace chamber.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Gas-fired muffle furnace comprising a furnace body (1), a combustion system (2) and a heat recovery drum (3), characterized in that: The heat recovery tank (3) is connected to an induced draft fan (5) via a flue pipe (4) on its side, and an air pipe (31) is connected to the top of the heat recovery tank (3) via a one-way valve (32). A spiral tube (33) is installed inside the heat recovery tank (3), and the top of the spiral tube (33) is connected to the inside of the air pipe (31) via a one-way valve (32). The bottom end of the spiral tube (33) extends into the furnace chamber of the furnace body (1).

2. The gas-fired muffle furnace of claim 1, wherein: The combustion system (2) includes a pressure reducing valve (21), a gas flow meter (22), a gas valve (23) and a burner (24) connected in sequence by pipes, and the burner (24) extends into the furnace chamber of the furnace body (1) and is connected to the bottom end of the spiral tube (33).

3. The gas-fired radiant furnace of claim 1, wherein: The outer wall of the heat recovery tank (3) is connected with an insulation layer (34).

4. The gas-fired muffle furnace of claim 1, wherein: The upper front opening of the furnace body (1) is covered with a heat-insulating cover (6).

5. The gas-fired muffle furnace of claim 1, wherein: The furnace body (1) is provided with a material hopper (7) on the upper rear side.

6. The gas-fired muffle furnace of claim 1, wherein: An aluminum liquid temperature probe (8) is also installed on the upper front side of the furnace body (1).

7. The gas-fired muffle furnace of claim 1, wherein: Thermocouples (9) are also installed inside the furnace chamber of the furnace body (1).

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