Waste heat recovery structure for molded pulp drying line

Abstract

The invention relates to the technical field of paper pulp molding, and particularly discloses a waste heat recovery structure for a paper pulp molding drying line, which comprises an induced draft fan, an adjusting air pipe, a combustion engine, a hearth and an air inlet pipe, the hearth is arranged at the bottom of the combustion engine, and the combustion engine is respectively communicated with the interiors of the hearth and the adjusting air pipe; the adjusting air pipe is communicated with the air inlet pipe and the interior of the induced draft fan, the induced draft fan is communicated with a drying tunnel in the drying line, the induced draft fan recovers high-temperature air in the drying tunnel, the adjusting air pipe distributes return air balance of the two combustors, and the air inlet pipe is used for adjusting cold air supplement so as to protect the combustors. The induced draft fan, the adjusting air pipe, the burner and the air inlet pipe are arranged to form a hot air system, hot air circulation in the drying line is achieved through the hot air system, and therefore energy consumption is reduced, the production efficiency can be improved, and practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp molding, and in particular to a waste heat recovery structure for a pulp molding drying line. Background Art

[0002] Pulp molding, also known as three-dimensional papermaking, uses pulp as the raw material and forms a molded product into a specific shape using a special mold on a molding machine. Pulp molding offers advantages such as renewable raw materials, easy transportation, and environmental friendliness. It is primarily used in applications such as lunch boxes, tableware, and product trays. Pulp molded products require drying after molding.

[0003] After searching, the Chinese invention patent application with patent application number CN202411626971.7 discloses a pulp molding thermoforming device with a waste heat utilization system, including: a molding machine lower shell, a molding machine upper shell, a hydraulic system, a hot pressing upper mold heating system, a hot pressing lower mold heating system, a waste heat utilization system, a slide and a steam-water separation system. Compared with the existing technology, the invention has the following beneficial effects: multiple heat exchangers in the heat exchange zone are connected to the cold water inlet, cold air inlet and hot water outlet, and hot air outlet through multiple circulation inlet pipes and multiple circulation outlet pipes to form the cold part structure of the entire waste heat utilization system, and the interior of the load-bearing base is divided into two heat exchange zones to form the hot part structure of the entire waste heat utilization system; the waste heat utilization system can simultaneously heat the cold water and cold air, and finally obtain two heat sources, hot water and hot air, which is convenient for subsequent reuse of waste heat, and also effectively avoids the energy waste and environmental pollution caused by direct discharge of steam.

[0004] Another example is a Chinese utility model patent application numbered CN202121875237.6, which discloses a steam waste heat collection device and a steam collection system for a pulp molding machine. The steam waste heat collection device includes: a heating water tank; a steam inlet box, comprising a first box body and a steam inlet pipe, the bottom wall of the first box body having a plurality of first connecting holes; a plurality of first heat exchange tubes connected to the corresponding first connecting holes; a plurality of second heat exchange tubes connected to the corresponding first heat exchange tubes; and a steam exhaust box, comprising a second box body and an exhaust pipe, the second box body having a plurality of second connecting holes, the plurality of second connecting holes being connected to the other ends of the corresponding second heat exchange tubes. The steam inlet pipe is connected to the steam collection device of the pulp molding machine. High-temperature, high-pressure steam enters the steam inlet box from the steam inlet pipe, passes through the first heat exchange tubes, the second heat exchange tubes, and the steam exhaust box in sequence, and is discharged through the exhaust pipe. During this process, the steam condenses and releases heat, and the hot water generated in the heating water tank can be supplied to the workshop, saving resources.

[0005] Although the existing waste heat recovery equipment can meet basic usage requirements, it consumes a lot of energy to circulate hot air inside the drying line. Therefore, it is necessary to make further improvements to the existing technology. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that, in response to the above-mentioned defects of the prior art, a waste heat recovery structure for a pulp molding drying line is provided. A hot air system is formed by arranging an induced draft fan, a regulating air duct, a burner and an air inlet duct, and the hot air system is used to realize the hot air circulation inside the drying line, thereby reducing energy consumption, improving production efficiency, and having high practicality.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] A waste heat recovery structure for a pulp molding drying line includes an induced draft fan, a regulating air duct, a burner, a furnace and an air inlet duct. The furnace is arranged at the bottom of the burner, the burner is respectively connected to the furnace and the interior of the regulating air duct, the regulating air duct is respectively connected to the interior of the air inlet duct and the induced draft fan, the induced draft fan is connected to the drying duct inside the drying line, the induced draft fan recovers high-temperature air in the drying duct, the regulating air duct distributes the return air balance of the two burners, and the air inlet duct is used to adjust the cold air supply to protect the burner.

[0009] Preferably, the burner includes a first burner and a second burner distributed sequentially from left to right, and the first burner and the second burner are both connected to the interior of the regulating air duct.

[0010] Preferably, the air inlet pipe is installed on the regulating air duct, an air inlet is provided on the air inlet pipe, and an air inlet regulating plate is provided on the air inlet.

[0011] Preferably, the regulating air duct includes a first regulating air duct and a second regulating air duct, and the first regulating air duct and the second regulating air duct are connected to the interior of the first burner and the second burner respectively.

[0012] Preferably, a combustion box is provided between the burner and the furnace, a combustion inner cavity is provided in the combustion box, and the combustion inner cavity is communicated with the burner, the furnace and the interior of the regulating air duct respectively.

[0013] Preferably, the induced draft fan is connected to the interior of the drying tunnel through a drying tunnel connecting pipe.

[0014] By adopting the above technical scheme, the present invention provides a waste heat recovery structure for a pulp molding drying line, which has the following beneficial effects: the furnace in the waste heat recovery structure is arranged at the bottom of the burner, and the burner is respectively connected to the furnace and the interior of the regulating air duct, and the regulating air duct is respectively connected to the air inlet duct and the interior of the induced draft fan, and the induced draft fan is connected to the drying duct inside the drying line, and the induced draft fan recovers the high-temperature air in the drying duct, and the regulating air duct distributes the return air balance of the two burners. The air inlet duct is used to adjust the cold air supply air to protect the burner. A hot air system is formed by arranging the induced draft fan, the regulating air duct, the burner and the air inlet duct, and the hot air system is used to realize the hot air circulation inside the drying line, thereby reducing energy consumption. The energy consumption is low, the production efficiency can be improved, and the practicability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of the present invention;

[0016] Figure 2 It is the front view of the present invention;

[0017] In the figure, 1-induced draft fan, 2-adjusting air duct, 3-burner, 4-furnace, 5-air inlet duct, 6-first burner, 7-second burner, 8-air inlet, 9-air inlet adjustment plate, 10-first adjusting air duct, 11-second adjusting air duct, 12-combustion box, 13-baking channel connecting pipe. DETAILED DESCRIPTION

[0018] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0021] like Figure 1-2 As shown, the waste heat recovery structure for the pulp molding drying line includes an induced draft fan 1, a regulating air duct 2, a burner 3, a furnace 4, and an air inlet duct 5. The furnace 4 is located at the bottom of the burner 3. The burner 3 is connected to the furnace 4 and the interior of the regulating air duct 2. The regulating air duct 2 is connected to the interior of the air inlet duct 5 and the induced draft fan 1. The induced draft fan 1 is connected to the drying duct inside the drying line. As can be understood, the induced draft fan 1 is used to recover high-temperature air in the drying duct, the regulating air duct 2 is used to distribute the return air between the two burners 3, and the air inlet duct 5 is used to regulate the cold air supply to protect the burner 3.

[0022] Specifically, the burner 3 includes a first burner 6 and a second burner 7 distributed from left to right, and the first burner 6 and the second burner 7 are both connected to the interior of the regulating air duct 2; the air inlet duct 5 is installed on the regulating air duct 2, and an air inlet 8 is provided on the air inlet duct 5, and an air inlet adjustment plate 9 is provided on the air inlet 8 to adjust the amount of air intake, thereby controlling the amount of cold air and replenishing cold air for the burner 3; the regulating air duct 2 includes a first regulating air duct 10 and a second regulating air duct 11, and the first regulating air duct 10 and the second regulating air duct 11 are respectively connected to the interior of the first burner 6 and the second burner 7, a combustion box 12 is provided between the burner 3 and the furnace 4, and a combustion inner cavity is provided in the combustion box 12, and the combustion inner cavity is respectively connected to the burner 3, the furnace 4 and the regulating air duct 2, and the induced draft fan 1 is connected to the interior of the drying tunnel through the drying tunnel connecting pipe 13 to absorb the waste heat of the drying tunnel.

[0023] It can be understood that the present invention has a reasonable design and unique structure. A hot air system is formed by arranging an induced draft fan 1, an adjusting air duct 2, a burner 3 and an air inlet duct 5. The hot air system is used to realize the hot air circulation inside the drying line, thereby reducing energy consumption. The energy consumption is low, production efficiency can be improved, and the practicability is high.

[0024] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A waste heat recovery structure for a pulp molding drying line, characterized by: It includes an induced draft fan, an adjusting air duct, a burner, a furnace and an air inlet duct. The furnace is arranged at the bottom of the burner. The burner is connected with the furnace and the interior of the adjusting air duct respectively. The adjusting air duct is connected with the air inlet duct and the interior of the induced draft fan respectively. The induced draft fan is connected with the drying duct inside the drying line. The induced draft fan recovers the high-temperature air in the drying duct. The adjusting air duct distributes the return air balance of the two burners. The air inlet duct is used to adjust the cold air supply to protect the burner.

2. The waste heat recovery structure for a pulp molding drying line according to claim 1, characterized in that: The burners include a first burner and a second burner distributed sequentially from left to right, and both the first burner and the second burner are connected to the interior of the regulating air duct.

3. The waste heat recovery structure for a pulp molding drying line according to claim 1, characterized in that: The air inlet pipe is installed on the regulating air duct, an air inlet is opened on the air inlet pipe, and an air inlet regulating plate is provided on the air inlet.

4. The waste heat recovery structure for a pulp molding drying line according to claim 2, characterized in that: The regulating air duct includes a first regulating air duct and a second regulating air duct, and the first regulating air duct and the second regulating air duct are respectively connected to the interior of the first burner and the second burner.

5. The waste heat recovery structure for a pulp molding drying line according to claim 1, characterized in that: A combustion box is provided between the burner and the furnace, a combustion inner cavity is provided in the combustion box, and the combustion inner cavity is communicated with the burner, the furnace and the regulating air duct respectively.

6. The waste heat recovery structure for a pulp molding drying line according to claim 1, characterized in that: The induced draft fan is communicated with the interior of the drying tunnel through a drying tunnel connecting pipe.

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