Device for heating nitrogen by using waste heat of fly ash and fly ash pyrolysis system

Abstract

The invention belongs to the technical field of fly ash treatment, and particularly relates to a device for heating nitrogen by using fly ash waste heat and a fly ash pyrolysis system.The device comprises a fly ash material cooling runner and a nitrogen heating runner which are not communicated with each other; the cooling pipe comprises an evaporation section and a condensation section, the evaporation section is located in the fly ash material cooling flow channel, and the condensation section is located in the nitrogen heating flow channel; wherein the interior of the cooling pipe is in a vacuum state, and refrigerant is arranged in the cooling pipe. Fly ash materials to be cooled make contact with the evaporation sections of the cooling pipes, refrigerants in the cooling pipes rapidly evaporate to generate phase change to absorb a large amount of heat to cool fly ash, the vaporized refrigerants enter the condensation sections, where the nitrogen heating runners are located, of the cooling pipes, and after being cooled by normal-temperature nitrogen, the refrigerants rapidly condense and generate phase change to release a large amount of heat; the nitrogen is rapidly heated; fly ash can be rapidly cooled, part of heat can be converted and used for heating nitrogen, energy consumption is reduced, and the device is simple in structure, low in carbon, environmentally friendly, easy to operate, safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of fly ash treatment, and particularly relates to a device for heating nitrogen by utilizing waste heat of fly ash and a fly ash pyrolysis system. Background Art

[0002] In the existing thermal decomposition equipment, the material enters the subsequent water-cooling spiral device for cooling through the discharge port after thermal decomposition. This heat exchange method has poor heat exchange effect, and part of the material heat is not utilized, resulting in waste; in addition, nitrogen is directly introduced into the thermal decomposition equipment, absorbing part of the heat, which increases the additional operating cost.

[0003] Therefore, how to improve the above-mentioned practical defects is a difficult problem that needs to be solved urgently in this field. Summary of the invention

[0004] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to solve at least one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a device for heating nitrogen using fly ash waste heat and a fly ash pyrolysis system that meets one or more of the above-mentioned needs.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A device for heating nitrogen using fly ash waste heat, comprising a fly ash material cooling flow channel and a nitrogen heating flow channel which are not connected to each other;

[0007] It also includes a cooling pipe, which includes an evaporation section and a condensation section. The evaporation section is located in the fly ash material cooling channel, and the condensation section is located in the nitrogen heating channel. The cooling pipe is in a vacuum state and is provided with a refrigerant.

[0008] As a preferred solution, the cooling pipes are arranged obliquely in the fly ash material cooling flow channel and the nitrogen heating flow channel;

[0009] Along the material flow direction in the fly ash material cooling flow channel, the evaporation section of the cooling pipe is located downstream of the condensation section.

[0010] As a preferred solution, the inner wall of the condensation section of the cooling tube has a concave hole.

[0011] As a preferred embodiment, the cooling pipes are distributed in an N*M array along the circumference of the fly ash material cooling flow channel and the material flow direction, where N is the number of cooling pipes distributed along the circumference of the fly ash material cooling flow channel, and M is the number of cooling pipes along the material flow direction of the fly ash material cooling flow channel.

[0012] As a preferred solution, a guide plate is provided in the nitrogen heating flow channel, and the guide plate and the condensation section of the cooling tube form a bent flow channel.

[0013] As a preferred solution, the guide plate is a conical ring structure;

[0014] The cooling pipe is parallel to the conical surface of the guide plate, or the cooling pipe is inclined to the conical surface of the guide plate at a preset inclination angle.

[0015] As a preferred solution, along the nitrogen flow direction in the nitrogen heating flow channel, guide plates are inserted between adjacent cooling tubes to form a serpentine bending flow channel;

[0016] Alternatively, adjacent cooling tubes are staggered along the nitrogen flow direction in the nitrogen heating flow channel.

[0017] As a preferred embodiment, the feed inlet of the fly ash material cooling flow channel is adjacent to the outlet of the nitrogen heating flow channel, and the outlet of the fly ash material cooling flow channel is adjacent to the inlet of the nitrogen heating flow channel, so that the material flow direction in the fly ash material cooling flow channel is opposite to the nitrogen flow direction in the nitrogen heating flow channel.

[0018] As a preferred solution, the feed inlet and the discharge outlet of the fly ash material cooling channel are respectively provided with threaded flanges.

[0019] The present invention also provides a fly ash pyrolysis system, including a thermal decomposition device and a device for heating nitrogen using fly ash waste heat as described in any of the above schemes, wherein the feed port of the fly ash material cooling flow channel is connected to the discharge port of the thermal decomposition device.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The device for heating nitrogen by utilizing waste heat of fly ash of the present invention utilizes the liquid refrigerant in the cooling pipe to undergo phase change after heat exchange with the fly ash material, evaporates and absorbs a large amount of heat to cool the fly ash material, and the evaporated refrigerant condenses and exchanges heat with nitrogen at room temperature in the nitrogen heating flow channel and releases a large amount of heat to heat the nitrogen;

[0022] (2) The cooling pipes of the present invention are arranged obliquely, and the condensed refrigerant flows back into the side where the fly ash material cooling channel is located, and the cycle repeats;

[0023] (3) The inner wall concave hole design of the cooling tube condensation section of the present invention is conducive to accelerating the condensation of the refrigerant;

[0024] (4) The nitrogen heating flow channel of the present invention is provided with a guide plate to extend the residence time of nitrogen in the flow channel, which is conducive to sufficient heat exchange;

[0025] (5) The device and fly ash pyrolysis system of the present invention can not only quickly cool the fly ash, but also convert the heat into nitrogen for heating, thus saving energy, having a simple structure, being low-carbon and environmentally friendly, being easy to operate, and being safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a device for heating nitrogen using fly ash waste heat according to Example 1 of the present invention;

[0027] Figure 2 This is a schematic cross-sectional view of condensed liquid beads on the inner wall of the condensation section of the cooling tube in Example 1 of the present invention. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the embodiments of the present invention, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings and other implementation methods can be obtained based on these accompanying drawings without creative work.

[0029] Embodiment 1:

[0030] like Figure 1 As shown, the device for heating nitrogen by utilizing waste heat from fly ash of this embodiment comprises a vertically extending inner tube 3 and an outer tube 4 coaxially sleeved outside the inner tube, the inner cavity of the inner tube 3 constitutes a fly ash material cooling flow channel 1, and a nitrogen heating flow channel 2 is formed between the outer wall of the inner tube 3 and the inner wall of the outer tube 4, the fly ash material cooling flow channel 1 and the nitrogen heating flow channel 2 are not connected to each other, the fly ash material cooling flow channel 1 is used for cooling the fly ash material, and the nitrogen heating flow channel 2 is used for heating the nitrogen.

[0031] The inner tube wall of the present embodiment is fixedly and sealed with a cooling tube array, which is composed of N cooling tubes 6 distributed at intervals along the circumference of the inner tube and M cooling tubes 6 distributed at intervals along the vertical direction of the inner tube. The values ​​of M and N can be determined according to actual application requirements; the inner cavity of the cooling tube 6 is evacuated, liquid refrigerant is injected and sealed, and the cooling tube 6 includes an evaporation section 6-1 and a condensation section 6-2. The evaporation section 6-1 is located in the fly ash material cooling channel 1, and the condensation section 6-2 is located in the nitrogen heating channel 2.

[0032] The cooling pipe 6 of this embodiment is arranged obliquely in the fly ash material cooling flow channel 1 and the nitrogen heating flow channel 2; along the material flow direction in the fly ash material cooling flow channel 1 (i.e. vertically downward), the evaporation section 6-1 is located downstream (i.e. below) the condensation section 6-2; with this design, the fly ash material contacts the evaporation section 6-1 of the cooling pipe through the fly ash material cooling flow channel 1, and the refrigerant inside the cooling pipe 6 evaporates and absorbs heat, so that the fly ash material is cooled, and the evaporated refrigerant enters the condensation section 6-2 of the cooling pipe, condenses and exchanges heat with the nitrogen at room temperature in the nitrogen heating flow channel 2 and releases a large amount of heat, so that the nitrogen is heated; since the cooling pipe 6 is arranged obliquely, the condensed refrigerant flows back into the evaporation section 6-1 under the action of gravity; the cycle is repeated, the fly ash material is cooled, and the nitrogen is heated.

[0033] In addition, if Figure 2As shown, the inner wall of the condensation section 6-2 of the cooling tube of this embodiment is distributed with array-type concave holes 60, which promote the refrigerant to form film-like condensation on the wall surface to form condensation liquid beads 10, thereby accelerating the condensation process.

[0034] In order to increase the heat exchange area between the nitrogen and the condensation section 6-2 of the cooling pipe, the inner wall of the outer tube 4 of the present embodiment is provided with a guide plate 5, and the guide plate 5 is matched with the outer wall of the inner tube at a preset distance. The guide plate 5 is located in the nitrogen heating flow channel 2. With this design, the guide plate 5 and the condensation section 6-2 of the cooling pipe constitute a bent flow channel; wherein, along the material flow direction in the fly ash material cooling flow channel 1, the guide plate 5 is arranged between adjacent cooling pipes 6, the guide plate 5 is a conical ring structure, and the cooling pipe 6 is arranged parallel to the conical surface of the guide plate 5, thereby constituting a serpentine bent flow channel, forming turbulence to enhance heat exchange.

[0035] The feed inlet of the fly ash material cooling channel 1 of the present embodiment (i.e., the top opening of the inner tube) is adjacent to the air outlet 9 of the nitrogen heating channel 2, and the discharge port of the fly ash material cooling channel 1 (i.e., the bottom opening of the inner tube) is adjacent to the air inlet 8 of the nitrogen heating channel 2, so that the material flow direction in the fly ash material cooling channel 1 is opposite to the nitrogen flow direction in the nitrogen heating channel 2, thereby effectively improving the sufficient heat exchange of the fly ash material and the nitrogen.

[0036] In addition, the feed inlet and the discharge outlet of the fly ash material cooling channel 1 of the present embodiment are both provided with threaded flanges 7, which are convenient for docking with other equipment such as thermal decomposition equipment.

[0037] The condensed refrigerant in this embodiment returns to the material side (i.e., the fly ash material cooling channel where the evaporation section of the cooling pipe is located) due to gravity, and the cycle repeats, so that the material side is continuously cooled and the nitrogen side is continuously heated.

[0038] The fly ash pyrolysis system of this embodiment includes a thermal decomposition device and also includes the above-mentioned device for heating nitrogen using fly ash waste heat. The feed inlet of the fly ash material cooling flow channel is connected to the discharge port of the thermal decomposition device to achieve cooling of the fly ash material and heating of the nitrogen.

[0039] Embodiment 2:

[0040] The device for heating nitrogen by utilizing fly ash waste heat in this embodiment is different from that in Embodiment 1 in that:

[0041] The cooling pipe is inclined at a preset angle to the conical surface of the guide plate, so as to achieve variable size adjustment of the nitrogen heating flow channel to meet the needs of different applications;

[0042] For other structures, please refer to Example 1.

[0043] The fly ash pyrolysis system of this embodiment includes a thermal decomposition device and also includes a device for heating nitrogen using fly ash waste heat of this embodiment. The feed inlet of the fly ash material cooling flow channel is connected to the discharge port of the thermal decomposition device, which can also achieve cooling of the fly ash material and heating of the nitrogen.

[0044] Embodiment 3:

[0045] The device for heating nitrogen by utilizing fly ash waste heat in this embodiment is different from that in Embodiment 1 in that:

[0046] Along the nitrogen flow direction in the nitrogen heating flow channel, adjacent cooling tubes are staggered, that is, the upper cooling tubes and the lower cooling tubes are staggered to meet the needs of different applications;

[0047] For other structures, please refer to Example 1.

[0048] The fly ash pyrolysis system of this embodiment includes a thermal decomposition device and also includes a device for heating nitrogen using fly ash waste heat of this embodiment. The feed inlet of the fly ash material cooling flow channel is connected to the discharge port of the thermal decomposition device, which can also achieve cooling of the fly ash material and heating of the nitrogen.

[0049] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, according to the ideas provided by the present invention, there will be changes in the specific implementation methods, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A device for heating nitrogen using fly ash waste heat, characterized in that: It includes a fly ash material cooling flow channel and a nitrogen heating flow channel which are not connected to each other; It also includes a cooling pipe, which includes an evaporation section and a condensation section. The evaporation section is located in the fly ash material cooling channel, and the condensation section is located in the nitrogen heating channel. The cooling pipe is in a vacuum state and is provided with a refrigerant.

2. The device according to claim 1, characterized in that The cooling pipes are arranged obliquely in the fly ash material cooling flow channel and the nitrogen heating flow channel; Along the material flow direction in the fly ash material cooling flow channel, the evaporation section of the cooling pipe is located downstream of the condensation section.

3. The device according to claim 2, characterized in that The inner wall of the condensation section of the cooling pipe is provided with a concave hole.

4. The device according to claim 2, characterized in that The cooling pipes are distributed in an N*M array along the circumference of the fly ash material cooling flow channel and the material flow direction, where N is the number of cooling pipes distributed along the circumference of the fly ash material cooling flow channel, and M is the number of cooling pipes along the material flow direction of the fly ash material cooling flow channel.

5. The device according to any one of claims 1 to 4, characterized in that: A guide plate is arranged in the nitrogen heating flow channel, and the guide plate and the condensation section of the cooling pipe form a bent flow channel.

6. The device according to claim 5, characterized in that The guide plate is a conical ring structure; The cooling pipe is parallel to the conical surface of the guide plate, or the cooling pipe is inclined to the conical surface of the guide plate at a preset inclination angle.

7. The device according to claim 5, characterized in that Along the nitrogen flow direction in the nitrogen heating flow channel, guide plates are inserted between adjacent cooling pipes to form a serpentine bending flow channel; Alternatively, adjacent cooling tubes are staggered along the nitrogen flow direction in the nitrogen heating flow channel.

8. The device according to any one of claims 1 to 4, characterized in that: The feed inlet of the fly ash material cooling flow channel is adjacent to the outlet of the nitrogen heating flow channel, and the outlet of the fly ash material cooling flow channel is adjacent to the inlet of the nitrogen heating flow channel, so that the material flow direction in the fly ash material cooling flow channel is opposite to the nitrogen flow direction in the nitrogen heating flow channel.

9. The device according to any one of claims 1 to 4, characterized in that: The feed inlet and the discharge outlet of the fly ash material cooling flow channel are respectively provided with threaded flanges.

10. A fly ash pyrolysis system, comprising a pyrolysis device, characterized in that: It also includes a device for heating nitrogen using fly ash waste heat as described in any one of claims 1 to 9, and the feed inlet of the fly ash material cooling flow channel is connected to the discharge port of the thermal decomposition equipment.

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