Grain drying waste heat recovery device

Abstract

The utility model relates to a grain drying waste heat recovery device which comprises a shell, a plurality of heat exchange pipes are arranged in the shell, each heat exchange pipe is divided into a cold end and a hot end, a partition plate is arranged in the shell to divide the cold end and the hot end into a cold cavity and a hot cavity, fins are arranged at the cold ends of the heat exchange pipes, and heat exchange pieces are arranged at the hot ends of the heat exchange pipes. The heat exchange pieces are attached to the outer wall of the hot end, and dust-containing hot and humid air generated during grain drying only flows through the hot cavity. Return air exchanges heat and circulates among the heat exchange tubes with larger tube spacing, so that dust accumulation can be effectively reduced; the heat exchanger provided by the utility model has the advantages of efficiently recovering waste heat and reducing dust accumulation, and is particularly suitable for a heat exchange working condition of dust-containing hot and wet air.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to a waste heat recovery device for grain drying. Background Technology

[0002] During grain drying operations, a large amount of hot and humid air is typically discharged, known as the dehumidification process; at the same time, a significant amount of medium-grade heat is also released, resulting in energy waste. Especially under low ambient temperature conditions, the heat energy required for drying necessitates a substantial energy supply, and the loss of medium-grade heat further exacerbates this energy waste.

[0003] Conventional waste heat recovery can usually be accomplished using commercially available heat exchange devices. However, due to the special conditions of grain drying, the grain carries a large amount of dust. When the dust-laden airflow passes through the equipment, the dust tends to accumulate, affecting the heat exchange efficiency. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a reasonably structured waste heat recovery device for grain drying, which is suitable for the heat energy reuse stage in the grain drying process and has the advantage of significantly reducing dust accumulation in heat exchange equipment.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A grain drying waste heat recovery device includes a shell, inside which are arranged several heat exchange tubes, each divided into a cold end and a hot end. A partition inside the shell separates the cold end and the hot end, forming a cold cavity and a hot cavity.

[0007] The cold end of the heat exchange tube is provided with fins, and the hot end of the heat exchange tube is provided with heat exchange plates; the heat exchange plates are attached to the outer wall of the hot end, and the dust-laden hot and humid air generated during grain drying only flows through the hot cavity.

[0008] The heat exchange plate adopts an external spiral structure and is screwed onto the outer wall of the hot end of the heat exchange tube.

[0009] The outer contour of the heat exchange plate is an arc-shaped structure that protrudes from the outer wall of the heat exchange tube.

[0010] The heat exchange fins extend from the bottom of the hot end of the heat exchange tube to the partition.

[0011] All heat exchange fins at the hot end of the heat exchange tubes have a co-directional spiral structure.

[0012] The cooling cavity is equipped with several parallel fins, which are arranged parallel to the partition.

[0013] The inlet and outlet of the fresh air flow are located on opposite sides of the fin gap.

[0014] The partition is larger than the fin size, and the partition is sealed to the outer shell.

[0015] The partition is made of heat-resistant plate.

[0016] All heat exchange tubes inside the outer casing are arranged in a right-angled triangular pattern.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention addresses the issue of dusty, hot, and humid air generated during grain drying by providing a heat exchanger that can isolate dust outside the flow path of fresh air. During the heat exchange process, the dusty, hot, and humid air accumulates more effectively in an environment with larger tube spacing and smaller structural gaps.

[0019] The spiral structure of the heat exchange fins increases the length of the heat exchange fins, thereby increasing the heat exchange area with the dusty, hot, and humid air; the collected heat energy is then efficiently transferred to the fresh air by the dense corrugated fins.

[0020] The heat exchanger provided in this application has the advantages of efficiently recovering excess heat energy and reducing dust accumulation, and is especially suitable for heat exchange conditions of dusty and humid air. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this application, with the outer shell hidden to illustrate the internal structure.

[0022] Figure 2 for Figure 1 The enlarged view of section A is used to illustrate the structure of the fins and heat exchange plates.

[0023] Figure 3 This is a schematic diagram of the hot end structure of this application.

[0024] Figure 4 for Figure 1 A top view is used to illustrate the equilateral triangle cross arrangement.

[0025] The components include: 1. partition; 2. heat exchange tube; 3. hot cavity; 4. cold cavity;

[0026] 201. Hot end; 202. Heat exchange fin; 203. Cold end; 204. Fin. Detailed Implementation

[0027] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0028] like Figures 1-4 As shown, the grain drying waste heat recovery device of this embodiment includes a shell, inside which are provided a plurality of heat exchange tubes 2. The heat exchange tubes 2 are divided into a cold end 203 and a hot end 201. A partition 1 is provided inside the shell to separate the cold end 203 and the hot end 201 to form a cold cavity 4 and a hot cavity 3.

[0029] The cold end 203 of the heat exchange tube 2 is provided with fins 204, and the hot end 201 of the heat exchange tube 2 is provided with heat exchange plates 202; the heat exchange plates 202 are attached to the outer wall of the hot end 201, and the dust-laden hot and humid air generated by grain drying only flows through the hot cavity 3.

[0030] The heat exchange plate 202 adopts an external spiral structure and is screwed onto the outer wall of the hot end 201 of the heat exchange tube 2.

[0031] The outer contour of the heat exchange fin 202 is an arc-shaped structure that protrudes from the outer wall of the heat exchange tube 2.

[0032] The heat exchange plate 202 extends from the bottom of the hot end 201 of the heat exchange tube 2 to the partition plate 1.

[0033] All heat exchange plates 202 at the hot end 201 of heat exchange tube 2 have a co-directional spiral structure.

[0034] The cooling cavity 4 is provided with several parallel fins 204, which are arranged parallel to the partition 1.

[0035] The inlet and outlet of the fresh air flow are located on opposite sides of the gap between the fins 204.

[0036] The size of partition 1 is larger than that of fin 204, and partition 1 is sealed to the outer shell.

[0037] Partition 1 is made of heat-resistant plate.

[0038] All heat exchange tubes 2 inside the outer shell are arranged in an equilateral triangular cross pattern.

[0039] The specific structure and working principle of this application are as follows:

[0040] The main design concept of this application is to take the hot and humid air containing dust generated during grain drying, filter it through dust removal and heat recovery, and then return the recovered heat to the heating process. The heat exchanger used for heat recovery is the key design feature of this application, which can effectively reduce the accumulation of dust in the hot and humid air in the heat exchanger and ensure the normal heat exchange operation of the heat exchanger.

[0041] The heat exchanger in this embodiment includes a shell, and the shell is divided into two chambers by a partition 1, such as... Figure 1 As shown, in this embodiment, the two chambers are arranged vertically because the heat exchange tube 2 built into the heat exchanger is vertically arranged. The changes in evaporation and condensation of the working fluid in the heat exchange tube 2 are realized in the vertical direction, which can divide the heat exchange tube 2 into a cold end 203 and a hot end 201. Therefore, the partition 1 has two functions. First, it divides the internal space of the outer shell into a cold chamber 4 and a hot chamber 3. On this basis, the heat energy of the hot chamber 3 needs to be exchanged, so the hot chamber 3 is used to receive dusty hot and humid air. The cold chamber 4 is used to recover heat energy. The other function of the partition 1 is to isolate the dusty hot and humid air outside the cold chamber 4.

[0042] Hot chamber 3 is used for heat exchange with dusty, hot and humid air, and cold chamber 4 is used for heat exchange with fresh air.

[0043] In order to improve the heat exchange efficiency of cold cavity 4, in this application, such as Figure 2 As shown, the cold end 203 of the heat exchange tube 2 uses closely spaced corrugated aluminum foil fins 204. These closely spaced corrugated aluminum foil fins 204 are nested within the outer wall of the heat exchange tube 2, greatly increasing the heat exchange area with the external fresh air flow and ensuring effective heat exchange. Simultaneously, the closely spaced corrugated aluminum foil fins 204 can significantly reduce the number of heat exchange tubes 2 used, thereby reducing equipment material costs.

[0044] The outer wall of the heat exchange tube 2 section in the heat cavity 3 is equipped with externally spiral heat exchange fins 202. In one embodiment of this application, the externally spiral heat exchange fins 202 are attached to the outer wall of the heat exchange tube 2. From the cross-sectional view of the heat exchange tube 2, the axial dimension of the heat exchange fins 202 is small; from the longitudinal structure of the heat exchange tube 2, the length of the heat exchange fins 202 is relatively long. The purpose of this arrangement is to increase the spacing between adjacent heat exchange tubes 2. In particular, compared with conventional fins 204, the heat exchange fins 202 attached to the tube wall in this embodiment can provide a significantly larger tube spacing.

[0045] As a further optimization of the structure, such as Figure 4 As shown, the heat exchange tubes 2 in this embodiment are arranged in an equilateral triangular staggered pattern, which provides a larger tube spacing than a matrix array.

[0046] As a further optimization of the structure, as shown in Figure 3, the surface of the external spiral heat exchanger 202 is an arc surface, which is set close to the tube wall. Compared with the conventional fin structure 204, this reduces the number of sharp corners and gaps, and lowers the probability of dust falling on the heat exchanger 202.

[0047] The dust-laden hot and humid air generated during grain drying is piped out and transported to the heat exchanger. It enters the hot chamber 3 of the heat exchanger and exchanges heat with the outer spiral heat exchange fins 202 and the hot end 201 of the heat exchange tube 2. The working fluid inside the tube evaporates upon heating and rises to the cold end 203 of the heat exchange tube 2. After heat exchange, the dust-laden hot and humid air is discharged from the outlet of the hot chamber 3.

[0048] Fresh air enters through the air inlet of the cold cavity 4. The fresh air exchanges heat with the closely spaced corrugated aluminum foil fins 204 and the cold end 203 of the heat exchange tube 2 to obtain heat energy and obtain air containing heat. The air is then output from the air outlet of the cold cavity 4 and sent to the heating process for reuse, thus realizing the recovery of heat energy.

[0049] Therefore, the advantages of this application are that dust can be effectively reduced to accumulate in an environment with larger pipe spacing and smaller structural gaps; the spiral structure increases the length of the heat exchange fins 202, increasing the heat exchange area with the dusty hot and humid air; the collected heat energy is efficiently transferred to the fresh air by the dense corrugated fins 204; therefore, the heat exchanger provided by this application has the advantages of efficiently recovering excess heat energy and reducing dust accumulation, and is especially suitable for heat exchange conditions of dusty hot and humid air.

[0050] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A grain drying waste heat recovery device, comprising a shell, wherein a plurality of heat exchange tubes (2) are provided inside the shell, characterized in that: The heat exchange tube (2) is divided into a cold end (203) and a hot end (201). A partition (1) is provided inside the outer shell to separate the cold end (203) and the hot end (201) to form a cold cavity (4) and a hot cavity (3). The cold end (203) of the heat exchange tube (2) is provided with fins (204), and the hot end (201) of the heat exchange tube (2) is provided with heat exchange plates (202); the heat exchange plates (202) are attached to the outer wall of the hot end (201), and the dust-laden hot and humid air generated by grain drying only flows through the hot cavity (3).

2. The grain drying waste heat recovery device as described in claim 1, characterized in that: The heat exchange plate (202) adopts an external spiral structure and is screwed onto the outer wall of the hot end (201) of the heat exchange tube (2).

3. The grain drying waste heat recovery device as described in claim 2, characterized in that: The outer contour of the heat exchange plate (202) is an arc-shaped structure that protrudes from the outer wall of the heat exchange tube (2).

4. A grain drying waste heat recovery device as described in claim 2, characterized in that: The heat exchange plate (202) extends from the bottom of the hot end (201) of the heat exchange tube (2) to the partition plate (1).

5. The grain drying waste heat recovery device as described in claim 1, characterized in that: All heat exchange tubes (2) have heat exchange plates (202) at the hot end (201) of the heat exchange tubes (2) in the same direction of spiral structure.

6. The grain drying waste heat recovery device as described in claim 1, characterized in that: The cooling cavity (4) is provided with several parallel fins (204), which are parallel to the partition (1).

7. A grain drying waste heat recovery device as described in claim 6, characterized in that: The inlet and outlet of the fresh air flow are located on opposite sides of the gap between the fins (204).

8. The grain drying waste heat recovery device as described in claim 1, characterized in that: The partition (1) is larger than the fin (204) and the partition (1) is sealed to the outer shell.

9. A grain drying waste heat recovery device as described in claim 8, characterized in that: The partition (1) is made of heat-resistant plate.

10. A grain drying waste heat recovery device as described in claim 1, characterized in that: All heat exchange tubes (2) inside the outer shell are arranged in an equilateral triangular fork.

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