A continuous positive backfire furnace waste heat utilization device

Abstract

The utility model discloses a continuous positive back annealing furnace waste heat utilization device, including air inlet pipe, coil, combustion air pipe and combustor, the air inlet pipe includes air inlet, the coil is located in cooling chamber at least partially, and one end is connected to the air inlet pipe, and is communicated with the air inlet pipe, the combustion air pipe is connected to the other end of coil, the combustor is connected to the combustion air pipe, air enters the air inlet pipe after from air inlet, and when passing through the coil in cooling chamber, carries out heat exchange with the hot air in cooling chamber and enters the combustor through the combustion air pipe, and the combustion air in the air inlet pipe can not only reduce the temperature of cooling chamber after cooling chamber, but also can improve combustion air temperature, and the combustion air after heating is used for the combustor, can reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of positive annealing furnace technology, specifically to a continuous positive annealing furnace waste heat utilization device. Background Technology

[0002] A continuous annealing and tempering furnace is a widely used continuous heat treatment equipment in industrial fields, mainly used for heat treatment processes such as normalizing, annealing, and tempering of metals and other materials. This equipment is typically equipped with a forced air cooling chamber, which rapidly and controllably cools the heat-treated workpieces. The cooled workpieces are then discharged through the outlet.

[0003] In the air-cooling process, room-temperature air is drawn into the cooling chamber by a fan system, where it exchanges heat with the high-temperature workpiece and becomes hot air. Currently, the commonly used cooling method is to directly exhaust this heated air into the workshop environment. However, this direct exhaust method has significant drawbacks: Energy waste: Hot air (i.e. waste heat) contains a large amount of recyclable thermal energy. Direct emission means that this part of the energy is completely wasted and not effectively utilized.

[0004] Environmental impact: The release of hot air into the workshop will inevitably lead to a significant increase in the ambient temperature around the continuous positive return furnace, which will worsen the working environment for workers and may increase the energy consumption burden of the workshop's air conditioning system in summer. Utility Model Content

[0005] To solve the above technical problems, this utility model provides a continuous positive return furnace waste heat utilization device. The combustion air in the air inlet pipe can not only reduce the temperature of the cooling chamber after passing through the cooling chamber, but also increase the temperature of the combustion air. The heated combustion air is used by the burner, which can reduce energy consumption.

[0006] The present invention adopts the following technical solution: A continuous positive return furnace waste heat utilization device includes an air inlet pipe, a coil, a combustion air pipe, and a burner. The air inlet pipe includes an air inlet. The coil is at least partially located in the cooling chamber, and one end is connected to the air inlet pipe and communicates with it. The combustion air pipe is connected to the other end of the coil. The burner is connected to the combustion air pipe. After entering the air inlet pipe from the air inlet, the combustion air exchanges heat with the hot air in the cooling chamber as it passes through the coil located in the cooling chamber. Then, it enters the burner through the combustion air pipe. The combustion air in the air inlet pipe, after passing through the cooling chamber, not only reduces the temperature of the cooling chamber but also increases the temperature of the combustion air. The heated combustion air is used by the burner, which can reduce energy consumption.

[0007] Preferably, a combustion-supporting fan is provided at the air inlet, which can draw ambient air into the air inlet pipe.

[0008] Preferably, the air inlet pipe is equipped with a regulating valve to adjust the air volume inside the air inlet pipe. The air flow rate entering the coil is controlled by the regulating valve, thereby adjusting the amount of combustion air required for the burner to burn more completely.

[0009] Preferably, the air inlet duct is provided with at least two coils; at least two of the coils are longitudinally distributed in the cooling chamber, and multiple coils are provided to improve heat exchange efficiency.

[0010] Preferably, the coil has a W-shaped structure, which extends the length of the coil and increases the heat exchange time between the combustion air and the air in the cooling chamber.

[0011] Preferably, the combustion air pipe is connected to the burner via a preheated air pipe.

[0012] Preferably, one end of the burner is connected to a natural gas pipe.

[0013] Preferably, the burner is provided with a flue pipe.

[0014] Preferably, the flow direction of the combustion air in the waste heat utilization device is roughly opposite to the movement direction of the workpiece in the continuous positive annealing furnace.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention provides a continuous positive return furnace waste heat utilization device, including an air inlet pipe, a coil, a combustion air pipe and a burner. After the combustion air enters the air inlet pipe from the air inlet, it exchanges heat with the hot air in the cooling chamber when passing through the coil located in the cooling chamber. Then it enters the burner through the combustion air pipe. The combustion air in the air inlet pipe can not only reduce the temperature of the cooling chamber after passing through the cooling chamber, but also increase the temperature of the combustion air. The heated combustion air is used by the burner, which can reduce energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the waste heat utilization device of this application.

[0017] Figure 2 This is a schematic diagram of the coil structure.

[0018] In the diagram, there are: air inlet pipe 1, air inlet 1-1, regulating valve 1-2, coil 2, combustion air pipe 3, burner 4, combustion air fan 5, preheated air pipe 6, natural gas pipe 7, flue pipe 8, and air-cooled chamber 9. Detailed Implementation

[0019] To facilitate understanding of the technical solution of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1 like Figure 1-2As shown, a continuous positive return furnace waste heat utilization device includes an air inlet pipe 1, a coil 2, a combustion air pipe 3, and a burner 4; The air inlet pipe 1 is roughly U-shaped, including an air inlet 1-1 facing downwards; The coil 2 is located in the cooling chamber, and one end is connected to the air inlet pipe 1 and communicates with the air inlet pipe 1; The combustion air pipe 3 is connected to the other end of the coil 2 and communicates with the coil 2; The burner 4 is connected to the combustion air pipe 3; Combustion air enters the air inlet 1 through the air inlet 1-1 and passes through the coil 2 located in the cooling chamber. It exchanges heat with the hot air in the cooling chamber and then enters the burner 4 through the combustion air pipe 3. The combustion air in the air inlet duct can not only reduce the temperature of the cooling chamber after passing through the cooling chamber, but also increase the temperature of the combustion air. The heated combustion air is used by the burner, which can reduce energy consumption.

[0021] In this embodiment, the cooling chamber can be an air-cooled chamber 9. The combustion air and the hot air in the air-cooled chamber 9 exchange heat through the pipe wall of the coil 2 before entering the combustion air pipe 3.

[0022] A combustion-supporting fan 5 is provided at the air inlet 1-1, which can draw ambient air into the air inlet pipe 1.

[0023] The air inlet pipe 1 is equipped with a regulating valve 1-2 to adjust the air volume inside the air inlet pipe 1. The air flow rate entering the coil 2 is controlled by the regulating valve 1-2, thereby adjusting the amount of combustion air required for combustion of the burner 4, so as to make the combustion more complete.

[0024] The air inlet duct 1 is equipped with two coils 2; the two coils 2 are longitudinally distributed in the cooling chamber, and multiple coils are installed to improve heat exchange efficiency.

[0025] The coil 2 has a W-shaped structure, which extends the length of the coil and increases the heat exchange time between the combustion air and the air in the cooling chamber.

[0026] The combustion air pipe 3 is connected to the burner 4 via the preheated air pipe 6.

[0027] One end of the burner 4 is connected to a natural gas pipe 7.

[0028] The burner 4 is equipped with a flue pipe 8.

[0029] Among them, the "front, back, left, right, up, down" perspectives of this device are... Figure 1The direction shown in the diagram is the reference. In this embodiment, the continuous forward annealing and tempering furnace is an abbreviation for continuous normalizing furnace, continuous annealing furnace, and continuous tempering furnace. The continuous forward annealing and tempering furnace includes a feeding platform on the right side, with feeding platform rollers on the feeding platform. The furnace body is equipped with several furnace rollers for moving workpieces. The burner 4 is located in the furnace heating zone of the continuous forward annealing and tempering furnace. The flow direction of the combustion air in the waste heat utilization device is roughly opposite to the movement direction of the workpiece in the continuous forward annealing and tempering furnace, that is, the movement direction of the workpiece is from right to left, and the movement direction of the combustion air is generally from left to right (there is up-and-down or back-and-forth movement in the air inlet pipe, coil, and preheating air pipe).

[0030] The above are merely preferred embodiments of this utility model. The scope of protection of this utility model is defined by the scope of the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of this utility model should also be considered as protection within the scope of this utility model.

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