A hot air conveying system for waste heat utilization

Abstract

The utility model provides a kind of hot air conveying system of waste heat utilization, including sintering kiln, drying kiln, waste heat recovery component, heat conducting oil heat exchange component, output pipe and spray tower;One end of waste heat recovery component is communicated with sintering kiln and drying kiln respectively, the other end of waste heat recovery component is communicated with one end of heat conducting oil heat exchange component, one end of output pipe is communicated with the other end of heat conducting oil heat exchange component, the other end of output pipe is communicated with spray tower, and heat conducting oil heat exchange component is used to transfer the heat of waste heat recovery component to output pipe.The utility model provides a kind of hot air conveying system of waste heat utilization according to the above-mentioned content, solves the problem that the flue gas of sintering kiln and the flue gas of drying kiln are generally collected as waste gas in prior art, directly enter desulfurization and dust removal environmental protection equipment, leading to that heat energy cannot be secondarily utilized, and causing the loss of heat energy.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat recovery and utilization technology, and in particular to a hot air conveying system for waste heat utilization. Background Technology

[0002] In the ceramic production process using natural gas, the firing kiln and the drying kiln are the core energy-consuming units. The firing kiln causes physical and chemical changes in the ceramic body through high-temperature firing to form the finished product, while the drying kiln is used to remove moisture from the body and reduce the energy consumption of subsequent firing.

[0003] However, in the existing technology, the flue gas from the firing kiln and the flue gas from the drying kiln are generally collected and sent directly into the desulfurization and dust removal environmental protection equipment as waste gas. The temperature of such waste gas is generally 300℃. After being sent into the desulfurization and dust removal environmental protection equipment, the heat energy cannot be reused, resulting in a waste of heat energy. Utility Model Content

[0004] The purpose of this utility model is to propose a hot air conveying system for waste heat utilization, which solves the problem that in the existing technology, the flue gas from firing kilns and drying kilns is generally collected and directly enters the desulfurization and dust removal environmental protection equipment as waste gas, resulting in the failure to reuse heat energy and the loss of heat energy.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A waste heat utilization hot air conveying system includes a firing kiln, a drying kiln, a waste heat recovery component, a heat transfer oil heat exchange component, an output pipe, and a spray tower;

[0007] One end of the waste heat recovery component is connected to the firing kiln and the drying kiln respectively, and the other end of the waste heat recovery component is connected to one end of the heat transfer oil heat exchange component. One end of the output pipe is connected to the other end of the heat transfer oil heat exchange component, and the other end of the output pipe is connected to the spray tower. The heat transfer oil heat exchange component is used to transfer the heat from the waste heat recovery component to the output pipe.

[0008] Furthermore, the heat transfer oil heat exchange assembly includes a first heat exchanger, a second heat exchanger, a circulating heat transfer pipe, and a fourth drive unit;

[0009] One end of the circulating heat pipe is installed inside the first heat exchanger, and the other end of the circulating heat pipe is installed inside the second heat exchanger. The circulating heat pipe is provided with circulating heat transfer oil, and the fourth drive unit is used to circulate the heat transfer oil.

[0010] Specifically, the first heat exchanger is provided with an exhaust gas outlet, which is connected to the first heat exchanger, and the second heat exchanger is provided with a cold air inlet, which is connected to the interior of the second heat exchanger.

[0011] Preferably, the waste heat recovery assembly includes a first branch pipe, a second branch pipe, and an inlet pipe;

[0012] One end of the first branch pipe is connected to the firing kiln, one end of the second branch pipe is connected to the drying kiln, one end of the inlet pipe is connected to the other end of the first branch pipe and the other end of the second branch pipe, and the other end of the inlet pipe is connected to the first heat exchanger.

[0013] In some embodiments, a first driving device, a second driving device, and a third driving device are also included;

[0014] The first driving device is installed at the connection between the first branch pipe and the firing kiln, and the first driving device is used to allow the exhaust gas from the firing kiln to enter the first branch pipe. The second driving device is installed at the connection between the second branch pipe and the drying kiln, and the second driving device is used to allow the exhaust gas from the drying kiln to enter the second branch pipe. The third driving device is installed at the connection between the output pipe and the spray tower, and the third driving device is used to allow the hot air from the output pipe to enter the spray tower.

[0015] Furthermore, it also includes a sensor, which is installed on the output tube and is used to detect the hot air temperature of the output tube. The sensor is electrically connected to the first driving device and the second driving device respectively.

[0016] The first drive device is equipped with a first butterfly valve, which is used to control the conveying amount of flue gas from the firing kiln. The second drive device is equipped with a second butterfly valve, which is used to control the conveying amount of flue gas from the drying kiln.

[0017] Specifically, the outer periphery of the first branch pipe, the second branch pipe and the inlet pipe are respectively wrapped with aluminum silicate fiber blankets, and the outer periphery of the aluminum silicate fiber blankets is wrapped with aluminum plates.

[0018] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0019] The high-temperature exhaust gas discharged directly is recovered to the heat transfer oil heat exchanger through the firing kiln, drying kiln, waste heat recovery component, heat transfer oil heat exchange component, output pipe and spray tower. The heat of the exhaust gas is transferred to the output pipe by heat transfer oil heat exchange, so that the output pipe can output hot air for use in the spray tower. This not only makes the heat effectively recovered and utilized, but also reduces the natural gas consumption of the spray tower, thus achieving energy saving and consumption reduction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a hot air conveying system according to one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a heat transfer oil heat exchange component according to one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a waste heat recovery component according to one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the third driving device according to one embodiment of the present invention;

[0024] The components include: 1. Firing kiln; 2. Drying kiln; 3. Waste heat recovery assembly; 3. First branch pipe; 31. Second branch pipe; 32. Inlet pipe; 33. Heat transfer oil heat exchange assembly; 4. First heat exchanger; 41. Exhaust gas outlet; 411. Second heat exchanger; 42. Cold air inlet; 421. Circulating heat transfer pipe; 43. Fourth drive unit; 44. Output pipe; 5. Spray tower; 6. First drive device; 7. First butterfly valve; 71. Second drive device; 8. Second butterfly valve; 81. Third drive device; 9. Sensor; 10. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "inner side," "outer side," "inner end," "outer end," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0027] In one embodiment of this utility model, such as Figure 1-4 As shown, a hot air conveying system for waste heat utilization includes a firing kiln 1, a drying kiln 2, a waste heat recovery component 3, a thermal oil heat exchange component 4, an output pipe 5, and a spray tower 6. One end of the waste heat recovery component 3 is connected to both the firing kiln 1 and the drying kiln 2, and the other end of the waste heat recovery component 3 is connected to one end of the thermal oil heat exchange component 4. One end of the output pipe 5 is connected to the other end of the thermal oil heat exchange component 4, and the other end of the output pipe 5 is connected to the spray tower 6. The thermal oil heat exchange component 4 is used to transfer the heat from the waste heat recovery component 3 to the output pipe 5. In this embodiment, during operation, the waste gas generated by the firing kiln 1 and the drying kiln 2 enters one end of the thermal oil heat exchanger 4 through the waste heat recovery component 3. Then, the thermal oil heat exchanger 4 uses thermal oil heat exchange to transfer the heat absorbed at one end of the thermal oil heat exchanger 4 to the other end of the thermal oil heat exchanger 4, so that the cold air in the output pipe 5 absorbs the heat at the other end of the thermal oil heat exchanger 4 and becomes hot air. The hot air is then transported to the spray tower 6 for granulation through the output pipe 5. This application uses the firing kiln 1, drying kiln 2, waste heat recovery component 3, thermal oil heat exchanger 4, output pipe 5, and spray tower 6 to recover the directly discharged high-temperature waste gas to the thermal oil heat exchanger 4 and use thermal oil heat exchange to transfer the heat of the waste gas to the output pipe 5, so that the output pipe 5 can output hot air for use in the spray tower 6. This not only enables the effective recovery and utilization of heat, but also reduces the natural gas consumption of the spray tower 6, achieving energy saving and consumption reduction.

[0028] like Figure 1-2 As shown, the heat transfer oil heat exchange assembly 4 includes a first heat exchanger 41, a second heat exchanger 42, a circulating heat transfer pipe 43, and a fourth drive unit 44; one end of the circulating heat transfer pipe 43 is installed inside the first heat exchanger 41, and the other end of the circulating heat transfer pipe 43 is installed inside the second heat exchanger 42. The circulating heat transfer pipe 43 is provided with circulating heat transfer oil, and the fourth drive unit 44 is used to circulate the heat transfer oil. In this embodiment, the housings of the first heat exchanger 41 and the second heat exchanger 42, as well as the circulating heat pipe 43, are all made of 310S stainless steel to make them resistant to high-temperature corrosion. The fourth drive unit 44 is a heat transfer oil circulation pump. During operation, after the waste heat recovery component 3 delivers the high-temperature waste gas into the interior of the first heat exchanger 41, the fourth drive unit 44 drives the heat transfer oil in the circulating heat pipe 43 to circulate, so that the heat transfer oil absorbs the heat from the first heat exchanger 41 and then flows into the interior of the second heat exchanger 42, where the heat is absorbed by the cold air from the output pipe 5 and becomes hot air, which is convenient for subsequent use in the spray tower 6 for granulation. This is convenient, fast, and has high heat exchange efficiency.

[0029] like Figure 1-2As shown, the first heat exchanger 41 is provided with an exhaust gas outlet 411, which is connected to the first heat exchanger 41. The second heat exchanger 42 is provided with a cold air inlet 421, which is connected to the interior of the second heat exchanger 42. In this embodiment, the lower right side of the first heat exchanger 41 is connected to the waste heat recovery component 3, the exhaust port 411 is located at the upper left side of the first heat exchanger 41, the lower left side of the second heat exchanger 42 is connected to the output pipe 5, and the cold air inlet 421 is located at the upper right side of the second heat exchanger 42. During operation, high-temperature exhaust gas enters the interior of the first heat exchanger 41 from the lower right side. After absorbing heat through the circulating heat pipe 43, low-temperature exhaust gas is discharged from the exhaust port 411 and directly sent to the desulfurization tower for low-temperature desulfurization and denitrification. When the heat is transferred to the interior of the second heat exchanger 42, cold air enters from the cold air inlet 421 at the upper right side of the second heat exchanger 42. After the cold air absorbs heat and becomes hot air, it is then transported to the spray tower 6 through the output pipe 5 at the lower left side of the second heat exchanger 42 for use, which is convenient and fast.

[0030] like Figure 1-3 As shown, the waste heat recovery assembly 3 includes a first branch pipe 31, a second branch pipe 32, and a collection pipe 33. One end of the first branch pipe 31 is connected to the firing kiln 1, one end of the second branch pipe 32 is connected to the drying kiln 2, one end of the collection pipe 33 is connected to the other end of both the first branch pipe 31 and the second branch pipe 32, and the other end of the collection pipe 33 is connected to the first heat exchanger 41. In this embodiment, during operation, the waste gas generated by the firing kiln flows from the first branch pipe 31 into the collection pipe 33, and the waste gas generated by the drying kiln 2 returns from the second branch pipe 32 to the collection pipe 33. The high-temperature waste gas from both is then collected and flows into the first heat exchanger 41 through the collection pipe 33, which is convenient and quick.

[0031] like Figure 1-4As shown, the system also includes a first driving device 7, a second driving device 8, and a third driving device 9. The first driving device 7 is installed at the connection between the first branch pipe 31 and the firing kiln 1, and is used to allow the exhaust gas from the firing kiln 1 to enter the first branch pipe 31. The second driving device 8 is installed at the connection between the second branch pipe 32 and the drying kiln 2, and is used to allow the exhaust gas from the drying kiln 2 to enter the second branch pipe 32. The third driving device 9 is installed at the connection between the output pipe 5 and the spray tower 6, and is used to allow the hot air from the output pipe 5 to enter the spray tower 6. In this embodiment, the first driving device 7 is a kiln flue gas fan, the second driving device 8 is a drying flue gas fan, and the third driving device 9 is a flue gas traction fan. During operation, the flue gas from the firing kiln 1 is transported to the first branch pipe 31 through the first driving device 7, the flue gas from the drying kiln 2 is transported to the second branch pipe 32 through the second driving device 8, and the hot air from the output pipe 5 is transported to the spray tower 6 through the third driving device 9.

[0032] like Figure 1-3 As shown, the system also includes a sensor 10, which is installed on the output pipe 5. The sensor 10 is used to detect the hot air temperature of the output pipe 5, and is electrically connected to the first driving device 7 and the second driving device 8 respectively. The first driving device 7 is equipped with a first butterfly valve 71, which is used to control the flow rate of flue gas from the firing kiln 1. The second driving device 8 is equipped with a second butterfly valve 81, which is used to control the flow rate of flue gas from the drying kiln 2. In this embodiment, the sensor 10, the first butterfly valve 71, and the second butterfly valve 81 are all prior art. The sensor 10 is a temperature sensor. During operation, the sensor 10 collects the flue gas temperature in the output pipe 5 and transmits it to the Omron PLC for analog signal conversion. It then controls the opening and closing degree of the first butterfly valve 71 and the second butterfly valve 81, as well as the corresponding fan frequency, thereby adjusting the output of the exhaust gas and thus regulating the hot air temperature to ensure heat utilization.

[0033] like Figure 3 As shown, the outer periphery of the first branch pipe 31, the second branch pipe 32, and the inlet pipe 33 is respectively wrapped with aluminum silicate fiber blankets, and the outer periphery of the aluminum silicate fiber blankets is wrapped with aluminum plates. In this embodiment, the outer periphery of the first branch pipe 31, the second branch pipe 32, and the inlet pipe 33 is wrapped with two layers of 25mm thick aluminum silicate fiber blankets for insulation, and a 1mm thick decorative aluminum plate is wrapped around the outer periphery of the aluminum silicate fiber blankets for protection.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hot air conveying system for waste heat utilization, characterized in that: This includes a firing kiln, a drying kiln, a waste heat recovery assembly, a heat transfer oil heat exchange assembly, an output pipe, and a spray tower; One end of the waste heat recovery component is connected to the firing kiln and the drying kiln respectively, and the other end of the waste heat recovery component is connected to one end of the heat transfer oil heat exchange component. One end of the output pipe is connected to the other end of the heat transfer oil heat exchange component, and the other end of the output pipe is connected to the spray tower. The heat transfer oil heat exchange component is used to transfer the heat from the waste heat recovery component to the output pipe.

2. The waste heat utilization hot air conveying system according to claim 1, characterized in that: The heat transfer oil heat exchange assembly includes a first heat exchanger, a second heat exchanger, a circulating heat transfer pipe, and a fourth drive unit; One end of the circulating heat pipe is installed inside the first heat exchanger, and the other end of the circulating heat pipe is installed inside the second heat exchanger. The circulating heat pipe is provided with circulating heat transfer oil, and the fourth drive unit is used to circulate the heat transfer oil.

3. A waste heat utilization hot air conveying system according to claim 2, characterized in that: The first heat exchanger is provided with an exhaust gas outlet, which is connected to the first heat exchanger. The second heat exchanger is provided with a cold air inlet, which is connected to the interior of the second heat exchanger.

4. A waste heat utilization hot air conveying system according to claim 2, characterized in that: The waste heat recovery assembly includes a first branch pipe, a second branch pipe, and an inlet pipe; One end of the first branch pipe is connected to the firing kiln, one end of the second branch pipe is connected to the drying kiln, one end of the inlet pipe is connected to the other end of the first branch pipe and the other end of the second branch pipe, and the other end of the inlet pipe is connected to the first heat exchanger.

5. A waste heat utilization hot air conveying system according to claim 4, characterized in that: It also includes a first drive unit, a second drive unit, and a third drive unit; The first driving device is installed at the connection between the first branch pipe and the firing kiln, and the first driving device is used to allow the exhaust gas from the firing kiln to enter the first branch pipe. The second driving device is installed at the connection between the second branch pipe and the drying kiln, and the second driving device is used to allow the exhaust gas from the drying kiln to enter the second branch pipe. The third driving device is installed at the connection between the output pipe and the spray tower, and the third driving device is used to allow the hot air from the output pipe to enter the spray tower.

6. A waste heat utilization hot air conveying system according to claim 5, characterized in that: It also includes a sensor, which is installed on the output tube and is used to detect the hot air temperature of the output tube. The sensor is electrically connected to the first driving device and the second driving device respectively. The first drive device is equipped with a first butterfly valve, which is used to control the conveying amount of flue gas from the firing kiln. The second drive device is equipped with a second butterfly valve, which is used to control the conveying amount of flue gas from the drying kiln.

7. A waste heat utilization hot air conveying system according to claim 4, characterized in that: The outer periphery of the first branch pipe, the second branch pipe and the inlet pipe are respectively wrapped with aluminum silicate fiber blankets, and the outer periphery of the aluminum silicate fiber blankets is wrapped with aluminum plates.

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