Low-grade industrial waste heat recycling device

Abstract

The utility model discloses a low-grade industrial waste heat recycling device which comprises a base, an air inlet shell and an air outlet shell are fixedly arranged on the left side and the right side of the upper end face of the base respectively, and a plurality of air guide pipes distributed in a matrix mode are arranged between the air inlet shell and the air outlet shell in a communicated mode. A plurality of heat storage bricks used for wrapping the gas guide pipes are fixedly arranged between the gas inlet shell and the gas outlet shell, a winding-shaped heat exchange channel allowing heat exchange liquid to circulate is formed in each heat storage brick, a liquid inlet communicated with the heat exchange channel is formed in the front face of the heat storage brick located on the uppermost layer, and a liquid outlet communicated with the heat exchange channel is formed in the front face of the heat storage brick located on the lowermost layer. A matrix type gas guide tube array and multi-stage heat storage brick coupling structure is adopted, bidirectional heat conduction between the outer walls of the gas guide tubes and heat exchange channels in the heat storage bricks is achieved, the heat storage bricks are made of high-heat-conduction silicon carbide composite materials, absorbed heat can be stored for a long time, and when the heat needs to be used, heat exchange liquid is introduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a low-grade industrial waste heat recovery and recycling device. BACKGROUND

[0002] Low-grade industrial waste heat (temperature range 50-250 DEG C) as the secondary energy generally existing in the industrial production process, about 30%-50% of total industrial energy consumption. At present, a large number of low-temperature flue gas, steam condensate water and other waste heat resources in high energy consumption industries such as steel, chemical industry, cement are not effectively utilized. Limited to the heat transfer efficiency attenuation characteristics of traditional heat exchange device under low temperature difference condition, the waste heat generally exists "high recovery cost, low utilization value" technical bottleneck. According to the measured data, about 40% of 150-200 DEG C low-temperature flue gas in sintering process of metallurgical enterprises is directly discharged due to lack of economic and efficient recovery means, not only causes heat waste of more than 100 million joule per year, but also brings significant environmental heat pollution. The existing waste heat recovery device generally has the technical defects such as single heat exchange medium process, insufficient gas-liquid two-phase heat exchange, and difficulty in storing liquid after absorbing heat, which leads to the technical difficulties of less than 30% of waste heat recovery rate in actual engineering application. SUMMARY

[0003] (I) Technical problem

[0004] The utility model provides a low-grade industrial waste heat recovery and recycling device to solve the above technical problem.

[0005] (II) Technical content

[0006] To solve the above technical problems, the technical scheme of the utility model is as follows: a low-grade industrial waste heat recovery and recycling device, including base, the left and right sides of the upper end surface of base are respectively fixed with gas inlet shell and gas outlet shell, a plurality of matrix distribution gas guide pipes are communicated between the gas inlet shell and the gas outlet shell, a plurality of heat storage bricks for wrapping the gas guide pipes are fixed between the gas inlet shell and the gas outlet shell, the heat storage bricks are internally provided with meandering heat exchange channels for heat exchange liquid to flow through, a plurality of heat storage bricks are arranged in parallel and the heat exchange channels in the adjacent heat storage bricks are communicated in sequence, the front surface of the uppermost heat storage brick is provided with a liquid inlet communicating with the heat exchange channel, and the front surface of the lowermost heat storage brick is provided with a liquid outlet communicating with the heat exchange channel.

[0007] Further, the heat storage brick is composed of two parts stacked from top to bottom, and a passage is arranged in the middle for the gas guide pipe to pass through.

[0008] Further, the gas inlet shell is communicated with a gas inlet joint in the center of the outer side, and the gas outlet shell is communicated with a gas outlet joint in the center of the outer side.

[0009] Further, the air inlet shell and the air outlet shell are both hollow structures and their cavities are communicated through the air guide pipes.

[0010] Further, the upper end surface of the base is fixedly provided with a heat preservation cover for placing the heat dissipation of the heat storage bricks.

[0011] (Three) technical effects

[0012] Compared with the prior art, the utility model has the advantages that: the matrix type air guide pipe array and the multi-stage heat storage brick coupling structure are adopted, the bidirectional heat conduction of the outer wall of the air guide pipe and the inner heat exchange channel of the heat storage brick is realized, the gas-solid-liquid triple heat exchange path is realized, compared with the traditional single-stage heat exchange mode, the heat exchange efficiency is improved by more than 45%, the heat storage brick adopts high-thermal-conductivity silicon carbide composite material (thermal conductivity≥45W / m·K), the absorbed heat can be stored for a long time, when the heat is needed, the heat exchange liquid is introduced again, the design of the meandering heat exchange channel prolongs the residence time of the heat exchange medium to 3.2 times of the conventional straight pipe structure, and the heat recovery efficiency under the low temperature difference condition is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the three-dimensional structure schematic of the utility model Figure 1 .

[0014] Figure 2 It is the three-dimensional structure schematic of the utility model Figure 2 .

[0015] Figure 3 It is the front view structure schematic of the utility model.

[0016] Figure 4 It is the cross section structure schematic of the utility model Figure 1 .

[0017] Figure 5 It is the cross section structure schematic of the utility model Figure 2 .

[0018] Figure 6 It is the cross section structure schematic of the utility model Figure 3 .

[0019] Figure 7 It is the three-dimensional structure schematic of the utility model Figure 3 .

[0020] As shown in the figure: 1, base; 2, air inlet shell; 3, air outlet shell; 4, air guide pipe; 5, heat storage brick; 6, heat exchange channel; 7, liquid inlet; 8, liquid outlet; 9, channel; 10, air inlet joint; 11, air outlet joint; 12, heat preservation cover. DETAILED DESCRIPTION

[0021] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "center" and the like is the orientation or position relation based on the drawings shown, and is merely for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as a limitation on the utility model.

[0022] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "provided with", "mounted", "connected", "connected" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] The utility model will be further described in detail below in combination with the drawings.

[0024] In combination with the drawings Figure 1 to the drawings Figure 7 A low-grade industrial waste heat recycling device, including base 1, the upper end surface of base 1 is fixed with air inlet shell 2 and air outlet shell 3 respectively on both sides, a plurality of matrix distribution's air guide pipe 4 is arranged between air inlet shell 2 and air outlet shell 3, a plurality of heat storage bricks 5 for wrapping air guide pipe 4 is fixed between air inlet shell 2 and air outlet shell 3, the inside of heat storage brick 5 is provided with meandering heat exchange channel 6 for heat exchange liquid to flow, a plurality of heat storage bricks 5 are arranged in parallel and the heat exchange channels 6 in the adjacent heat storage bricks 5 are sequentially communicated, the front of the uppermost heat storage brick 5 is provided with liquid inlet 7 communicated with heat exchange channel 6, and the front of the lowermost heat storage brick 5 is provided with liquid outlet 8 communicated with heat exchange channel 6.

[0025] The heat storage brick 5 is stacked by two parts, and a passage 9 for the air guide pipe 4 to pass through is arranged in the middle part.

[0026] The air inlet joint 10 is arranged in the center of the outer side of the air inlet shell 2, the air outlet joint 11 is arranged in the center of the outer side of the air outlet shell 3, and the air inlet shell 2 and the air outlet shell 3 are both hollow structures and their inner cavities are communicated through the air guide pipe 4.

[0027] The upper end surface of the base 1 is fixedly provided with a heat preservation cover 12 for placing the heat dissipation of the heat storage brick 5.

[0028] The working principle of the low-grade industrial waste heat recycling device is as follows: the industrial waste heat enters the internally hollow gas inlet shell 2 through the gas inlet joint 10, and is uniformly distributed by the hollow cavities of the gas inlet shell 2 and the gas outlet shell 3 and the center-symmetrical joint design, and then flows into the matrix-arranged gas guide pipe 4. The gas guide pipe 4 is made of a corrosion-resistant aluminum-silicon alloy pipe with an outer diameter of Φ50mm, and the specific surface area reaches 0.65m 2 / m, which can efficiently conduct the waste heat from the pipe gas to the pipe wall. The heat storage brick 5 wrapping the gas guide pipe 4 is a core component, which is made of high-thermal-conductivity silicon carbide composite material (thermal conductivity≥45W / m·K) and is provided with a passage 9 through which the gas guide pipe 4 passes. In the gas-solid heat exchange process, the heat of the outer wall of the gas guide pipe 4 is rapidly conducted to the heat storage brick 5, and the heat storage brick 5 stores a large amount of waste heat by virtue of its own characteristics. At this time, if there is no heat demand, the device is in the heat storage state.

[0029] When the stored heat needs to be used, the heat exchange liquid flows into the serpentine heat exchange channel 6 from the liquid inlet 7 on the front surface of the uppermost heat storage brick 5. The heat stored in the heat storage brick 5 is transferred to the heat exchange liquid, and the solid-liquid heat exchange is completed. Since the heat exchange channels 6 of the adjacent heat storage bricks 5 are sequentially connected, the heat exchange liquid continuously absorbs heat when flowing through each level of heat storage bricks 5, and the heated heat exchange liquid carries heat out of the device to meet various heat demands. The heat preservation cover 12 adopts a nano aerogel composite heat insulation layer (thermal conductivity≤0.018W / m·K) and is matched with a double-layer reflective film structure, so that the surface heat loss rate of the device is controlled to be less than 3%, and the heat stored in the heat storage brick 5 can be effectively saved in the device, and can be used at any time by the input of the heat exchange liquid, thereby improving the overall efficiency and flexibility of the waste heat recycling.

[0030] The above describes the utility model and its implementation, which is not limited, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the utility model.

Claims

1. A low-grade industrial waste heat recovery and recycling device, comprising a base (1), the upper end face of the base (1) is respectively fixed with an air inlet shell (2) and an air outlet shell (3) on the left and right sides, characterized in that: The air inlet shell (2) and the air outlet shell (3) are communicated with a plurality of air guide pipes (4) arranged in a matrix, a plurality of heat storage bricks (5) are fixed between the air inlet shell (2) and the air outlet shell (3) and are used for wrapping the air guide pipes (4), the heat storage bricks (5) are internally provided with serpentine heat exchange channels (6) for the flow of heat exchange liquid, a plurality of the heat storage bricks (5) are arranged in parallel from top to bottom, and the heat exchange channels (6) in the adjacent heat storage bricks (5) are communicated in sequence, the front surface of the uppermost heat storage brick (5) is provided with an inlet (7) communicated with the heat exchange channels (6), and the front surface of the lowermost heat storage brick (5) is provided with an outlet (8) communicated with the heat exchange channels (6).

2. The low-grade industrial waste heat recovery and recycling device according to claim 1, characterized in that: The heat storage brick (5) is composed of two parts stacked from top to bottom, and a channel (9) for the air guide pipe (4) to pass through is arranged in the middle.

3. The low-grade industrial waste heat recovery and recycling device according to claim 1, characterized in that: The air inlet shell (2) is provided with an air inlet joint (10) communicated with the center of the outer side, and the air outlet shell (3) is provided with an air outlet joint (11) communicated with the center of the outer side.

4. The low-grade industrial waste heat recovery and recycling device according to claim 1, characterized in that: The air inlet shell (2) and the air outlet shell (3) are both hollow structures, and the inner cavities are communicated through the air guide pipes (4).

5. The low-grade industrial waste heat recovery and recycling device according to claim 1, characterized in that: The base (1) is fixedly provided with a heat preservation cover (12) on the upper end surface for placing the heat storage bricks (5) to dissipate heat.

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