Tea drying hot blast stove

Abstract

A tea leaf drying hot blast stove comprises a stove body, a heat exchanger is arranged in the stove body, the heat exchanger comprises a heat exchange pipe which is composed of a plurality of return strokes and arranged in an S shape, the heat exchange pipe is provided with a smoke outlet communicated with a fresh air inlet of the stove body, and the heat exchange pipe arranged in the S shape can prolong the running time of high-temperature smoke in the stove body. And the smoke outlet communicates with the fresh air inlet, waste heat of high-temperature smoke is used for preheating air entering from the fresh air inlet, the heat utilization efficiency of the smoke is improved, and heat recovery and utilization are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of tea drying equipment, in particular to a hot air furnace for drying tea. Background Art

[0002] The process that consumes the most heat in tea processing is tea drying, which can be done by hot air drying, metal conduction drying and radiation drying.

[0003] Metal conduction heating mainly transfers the temperature of the pot to the tea leaves, and the heat transfer is fast. Since the temperature of the leaves is high when they touch the pot surface, and the temperature of the leaves is low when they are scattered, and the contact is local, the heating is uneven, resulting in a strong and bitter taste of the tea; radiation drying mainly uses infrared or microwave as the medium to conduct heat, and the infrared penetration ability is poor, which will affect the quality of the tea. Hot air drying is more popular in the market because of its uniform heating. However, most of the current tea drying equipment uses fuel oil, coal or electricity as energy. During the combustion process of fuel oil and coal, a large amount of carbon dioxide and other pollutants will be generated, which has a huge impact on the environment and health. In addition, the heat utilization rate of flue gas is low, which wastes energy and causes certain losses to the company. Utility Model Content

[0004] The utility model aims to provide a tea drying hot air furnace, aiming at improving the utilization efficiency of flue gas heat.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tea drying hot air furnace comprises a furnace body, in which a heat exchanger is arranged, the heat exchanger comprises a heat exchange tube arranged in an S shape and composed of a plurality of return paths, the heat exchange tube is provided with a smoke inlet, a smoke exhaust port and a smoke exhaust passage connecting the smoke inlet and the smoke exhaust port, the furnace body is provided with a fresh air inlet and a hot air outlet connected to the furnace body, the fresh air inlet is provided with or connected to an air inlet device, external air is transported to the furnace body through the air inlet device, the smoke exhaust port is connected to the fresh air inlet, and the smoke inlet is connected to the smoke outlet of a burner.

[0007] Furthermore, the hot air outlet is provided with a temperature measuring device and also includes a control device, which is electrically connected to the air inlet device and the temperature measuring device, and the control device adjusts the air inlet rate of the air inlet device based on the temperature detected by the temperature measuring device.

[0008] Furthermore, the heat exchange tube includes a first return, a second return and a third return which are arranged in sequence and interconnected along the smoke exhaust direction, and the first return, the second return and the third return are arranged non-collinearly, and the inlet end of the first return constitutes the smoke inlet.

[0009] Furthermore, it also includes a first air collecting box, in which a partition plate is provided to divide the space of the air collecting box into a first chamber and a second chamber, the smoke exhaust port of the first return and the smoke inlet end of the second return are connected to the first chamber, the smoke exhaust end of the third return is connected to the second chamber, and the second chamber is provided with the smoke exhaust port.

[0010] Furthermore, it also includes a second air collecting box, and the smoke exhaust end of the second return and the smoke inlet end of the third return are connected to the second air collecting box.

[0011] Furthermore, the first return path includes a front section and a rear section of the heat exchanger tube which are sequentially connected along the flow direction of the smoke, and the radial dimension of the front section of the heat exchanger tube is smaller than the radial dimension of the rear section of the heat exchanger tube.

[0012] Furthermore, the first return path also includes a middle section of the heat exchanger tube, the radial dimension of which gradually increases along the smoke exhaust direction, and two ends of the middle section of the heat exchanger tube are respectively connected to the front section and the rear section of the heat exchanger tube.

[0013] Furthermore, the second return and the third return are respectively composed of a number of stainless steel pipes of equal diameter.

[0014] Furthermore, the furnace body includes a shell and an inner tank arranged in the shell, an insulation layer is provided between the shell and the inner tank, and the heat exchanger is arranged in the inner tank.

[0015] Furthermore, reinforcing ribs are provided on the top and bottom of the outer side of the inner liner respectively.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model proposes a tea drying hot air furnace, comprising a furnace body, a heat exchanger is arranged in the furnace body, the heat exchanger comprises a heat exchange tube arranged in an S shape and composed of a plurality of return paths, the heat exchange tube is provided with a smoke exhaust port connected to the fresh air inlet of the furnace body, the heat exchange tube arranged in an S shape can extend the running time of the high-temperature flue gas in the furnace body, thereby extending the heating time of the air in the furnace body, the smoke exhaust port is connected to the fresh air inlet, and the waste heat of the high-temperature flue gas is used to preheat the air entering from the fresh air inlet, thereby improving the heat utilization efficiency of the flue gas and realizing heat recovery and utilization.

[0018] 2. The utility model proposes a hot air furnace for drying tea leaves. The control device adjusts the air intake rate of the air intake device based on the temperature of the hot air outlet detected by the temperature measuring device, and adjusts the temperature of the hot air outlet to a suitable temperature in accordance with the drying curves of different tea leaves, so as to improve the quality of the finished tea. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of a hot air furnace for drying tea leaves of the utility model;

[0021] Figure 2 This is a cross-sectional view of a hot air furnace for drying tea leaves according to the utility model;

[0022] Figure 3 This is a schematic diagram of a heat exchanger of a hot air furnace for drying tea leaves according to the utility model;

[0023] Figure 4 This is a schematic diagram of the inner tank of a hot air furnace for drying tea leaves according to the utility model;

[0024] In the figure, 10, furnace body; 101, shell; 102, liner; 103, fresh air inlet; 104, hot air outlet; 20, heat exchanger; 201, smoke inlet; 202, smoke exhaust outlet; 30, temperature measuring device; 40, first return; 401, front section of heat exchanger tube; 402, middle section of heat exchanger tube; 403, rear section of heat exchanger tube; 50, second return; 60, third return; 70, first air collecting box; 701, partition plate; 702, first chamber; 703, second chamber; 80, second air collecting box; 90, exhaust pipe; 100, flue gas analysis device; 110, reinforcing ribs. DETAILED DESCRIPTION

[0025] Combine the following Figure 1-4 The utility model is described in detail.

[0026] A tea drying hot air furnace comprises a furnace body 10, in which a heat exchanger 20 is arranged, the heat exchanger 20 comprises a heat exchange tube arranged in an S shape and composed of a plurality of return paths, the heat exchange tube is provided with a smoke inlet 201, a smoke exhaust port 202 and a smoke exhaust passage connecting the smoke inlet 201 and the smoke exhaust port 202, the furnace body 10 is provided with a fresh air inlet 103 and a hot air outlet 104 connected to the furnace body 10, the fresh air inlet 103 is provided with or connected to an air inlet device, external air is transported to the furnace body 10 through the air inlet device, the smoke exhaust port 202 is connected to the fresh air inlet 103, and the smoke inlet 201 is connected to the smoke outlet of a burner.

[0027] When in use, the S-shaped heat exchange tubes can extend the running time of the high-temperature flue gas in the furnace body 10, thereby extending the heating time of the air in the furnace body 10. The smoke exhaust port 202 is connected to the fresh air inlet 103, and the waste heat of the high-temperature flue gas is used to preheat the air entering from the fresh air inlet 103, thereby improving the heat utilization efficiency of the flue gas and realizing heat recovery and utilization.

[0028] In this embodiment, the hot air outlet 104 is provided with a temperature measuring device 30, and also includes a control device, which is electrically connected to the air inlet device and the temperature measuring device 30. The control device adjusts the air inlet rate of the air inlet device based on the temperature detected by the temperature measuring device 30, and adjusts the temperature of the hot air outlet 104 to a suitable temperature in accordance with the drying curves of different tea leaves, so as to improve the quality of the finished tea.

[0029] In this embodiment, the heat exchange tube includes a first return 40, a second return 50 and a third return 60 which are arranged in sequence and connected to each other along the smoke exhaust direction, and the first return 40, the second return 50 and the third return 60 are arranged non-collinearly. Specifically, the first return 40, the second return 50 and the third return 60 are arranged in parallel from low to high, the smoke flow direction of the first return 40 and the third return 60 is the same, the smoke flow direction of the second return 50 is completely opposite to the smoke flow direction in the first return 40 and the third return 60, and the inlet end of the first return 40 constitutes a smoke inlet 201.

[0030] In this embodiment, a first air collecting box 70 is also included. A partition plate 701 is provided in the first air collecting box 70 to divide the space of the air collecting box into a first chamber 702 and a second chamber 703. The smoke exhaust port 202 of the first return 40 and the smoke inlet end of the second return 50 are connected to the first chamber 702. The smoke exhaust end of the third return 60 is connected to the second chamber 703. The second chamber 703 is provided with a smoke exhaust port 202. The smoke exhaust port 202 is connected to the fresh air inlet 103 through the smoke exhaust pipe 90. A smoke analysis device 100 is provided on the side of the smoke exhaust pipe 90 close to the fresh air inlet 103, which is used to detect smoke components to ensure complete combustion of the fuel gas. Further, a second air collecting box 80 is also included. The smoke exhaust end of the second return 50 and the smoke inlet end of the third return 60 are connected to the second air collecting box 80.

[0031] In this embodiment, the first return 40 includes a heat exchanger barrel front section 401 and a heat exchanger barrel rear section 403 which are sequentially connected along the smoke flow direction, and the radial dimension of the heat exchanger barrel front section 401 is smaller than the radial dimension of the heat exchanger barrel rear section 403. Further, the first return 40 also includes a heat exchanger barrel middle section 402, the radial dimension of which gradually increases along the smoke exhaust direction, and the two ends of the heat exchanger barrel middle section 402 are respectively connected to the heat exchanger barrel front section 401 and the heat exchanger barrel rear section 403. The second return 50 and the third return 60 are respectively composed of a number of equal-diameter stainless steel pipes.

[0032] In this embodiment, the furnace body 10 includes a shell 101 and an inner liner 102 arranged in the shell 101, an insulation layer is arranged between the shell 101 and the inner liner 102, the heat exchanger 20 is arranged in the inner liner 102, and reinforcing ribs 110 are respectively arranged on the top and bottom of the outer side of the inner liner 102 to ensure the strength of the furnace body 10.

[0033] In this embodiment, a proportional gas burner is used. Natural gas is a high-quality coal replacement energy source. The H / C ratio of natural gas is high, and the aromatic hydrocarbon and sulfur content in its chemical composition is very low. When it is completely burned, it can reduce the emission of CO2, CO, HC and particulate dust, and it is cleaner when used in the food industry.

[0034] The utility model proposes a tea drying hot air furnace, and its working principle is as follows:

[0035] The burner discharges the incompletely burned flue gas into the first return 40, and the high-temperature flue gas after full combustion flows through the first chamber 702, the second return 50, the second air collecting box 80, the third return 60 and the second chamber 703 in sequence. The cold air obtains a part of hot air after heat exchange, and the flue gas after heat exchange is collected into the fresh air inlet 103 through the exhaust pipe, realizing heat recovery and utilization, so that the cold air sent into the furnace body 10 is preheated, thereby increasing the initial temperature of the fresh air.

[0036] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A tea drying hot air furnace, comprising a furnace body, characterized in that: A heat exchanger is provided in the furnace body, and the heat exchanger includes a heat exchange tube arranged in an S shape and composed of a plurality of return paths. The heat exchange tube is provided with a smoke inlet, a smoke exhaust port and a smoke exhaust passage connecting the smoke inlet and the smoke exhaust port. The furnace body is provided with a fresh air inlet and a hot air outlet connected to the furnace body. The fresh air inlet is provided with or connected to an air inlet device, and external air is transported to the furnace body through the air inlet device. The smoke exhaust port is connected to the fresh air inlet, and the smoke inlet is connected to the smoke outlet of the burner.

2. A tea drying hot air furnace as claimed in claim 1, characterized in that: The hot air outlet is provided with a temperature measuring device and also includes a control device, which is electrically connected to the air inlet device and the temperature measuring device. The control device adjusts the air inlet rate of the air inlet device based on the temperature detected by the temperature measuring device.

3. A tea drying hot air furnace as claimed in claim 1, characterized in that: The heat exchange tube includes a first return, a second return and a third return which are sequentially connected and arranged in a direction of exhausting smoke, and the first return, the second return and the third return are arranged non-collinearly, and the inlet end of the first return constitutes the smoke inlet.

4. A tea drying hot air furnace as claimed in claim 3, characterized in that: It also includes a first air collecting box, in which a partition plate is provided to divide the space of the air collecting box into a first chamber and a second chamber, the smoke exhaust port of the first return and the smoke inlet end of the second return are connected to the first chamber, the smoke exhaust end of the third return is connected to the second chamber, and the second chamber is provided with the smoke exhaust port.

5. A tea drying hot air furnace as claimed in claim 4, characterized in that: It also includes a second air collecting box, and the smoke exhaust end of the second return and the smoke inlet end of the third return are connected to the second air collecting box.

6. A tea drying hot air furnace as claimed in claim 3, characterized in that: The first return path includes a front section of the heat exchanger tube and a rear section of the heat exchanger tube which are sequentially connected along the flow direction of the smoke body, and the radial dimension of the front section of the heat exchanger tube is smaller than the radial dimension of the rear section of the heat exchanger tube.

7. A tea drying hot air furnace as claimed in claim 6, characterized in that: The first return also includes a middle section of the heat exchanger tube, the radial size of which gradually increases along the smoke exhaust direction, and two ends of the middle section of the heat exchanger tube are respectively connected to the front section of the heat exchanger tube and the rear section of the heat exchanger tube.

8. A tea drying hot air furnace as claimed in claim 3, characterized in that: The second return and the third return are respectively composed of a number of stainless steel pipes of equal diameter.

9. A tea drying hot air furnace as claimed in claim 1, characterized in that: The furnace body comprises a shell and an inner container arranged in the shell, a heat-insulating layer is arranged between the shell and the inner container, and the heat exchanger is arranged in the inner container.

10. A tea drying hot air furnace as claimed in claim 9, characterized in that: The top and bottom of the outer side of the inner container are respectively provided with reinforcing ribs.

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