Spray drying waste heat recycling system

Abstract

The utility model discloses a spray drying waste heat recycling system which comprises a drying tower, an atomizer and a waste heat recycling unit, the atomizer is arranged at the top of the drying tower, and a spray nozzle of the atomizer extends into the drying tower; the waste heat recovery unit comprises a first cloth bag bin, an induced draft fan, a waste heat exchanger, a steam heat exchanger, an air feeder and a combustor which are sequentially connected, the lower end of the first cloth bag bin is communicated with the first cloth bag bin, and the combustor is communicated with the top of the drying tower. The problems that in the prior art, during spray drying, energy consumption is large, and waste heat recycling efficiency is low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of spray drying, and particularly relates to a spray drying waste heat recovery and utilization system. Background Art

[0002] Spray drying is a drying technology widely used in industrial production. Its working principle is to disperse a solution, emulsion or suspension into fine droplets through a sprayer, and then spray these droplets into hot air. In the hot air, the droplets quickly evaporate water to form dry particles.

[0003] In the prior art, when producing lithium iron phosphate electrode materials, it is necessary to use an atomizer to spray the solution into fine droplets and disperse them in a hot drying medium (hot air flow). The atomizer decomposes the raw material solution into droplets and sprays them into a hot air flow at a temperature of 120 - 300°C. By using the velocity difference between the droplets and the hot air flow during the movement of the droplets, the material can be quickly dried within a few seconds to more than ten seconds. Since a large amount of hot air flow is required when the droplets are dried, if the heat in the hot air flow and the heat of the boiler equipment in the production workshop are not recovered and utilized, a large amount of heat will be wasted. The energy consumption during droplet drying is relatively large, which will increase the production cost of lithium iron phosphate electrode materials. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above technical deficiencies, and provide a spray drying waste heat recovery and utilization system to solve the problems of large energy consumption and low waste heat recovery and utilization efficiency during spray drying in the prior art.

[0005] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a spray drying waste heat recovery and utilization system, including:

[0007] A drying tower;

[0008] An atomizer, which is arranged at the top of the drying tower, and the spray nozzle of the atomizer extends into the drying tower; and,

[0009] A waste heat recovery unit, which includes a first cloth bag bin, an induced draft fan, a waste heat exchanger, a steam exchanger, a forced draft fan and a burner connected in sequence. Among them, the lower end of the first cloth bag bin is communicated with the first cloth bag bin, and the burner is connected to the top of the drying tower.

[0010] In one embodiment, the atomizer is further connected with at least one feeding pump.

[0011] In one embodiment, a first temperature detector is connected between the burner and the drying tower.

[0012] In one embodiment, a second temperature detector is provided between the drying tower and the first cloth bag bin.

[0013] In one embodiment, the waste heat exchanger is used to initially heat the fresh air stream to 140 - 150 °C.

[0014] In one embodiment, the waste heat exchanger is used to initially heat the fresh air stream to 140 - 150 °C.

[0015] In one embodiment, the steam exchanger is connected to the steam pipeline of the boiler.

[0016] In one embodiment, a dehumidification unit is further included. The dehumidification unit includes a dehumidifier, a second cloth bag bin, and a material collection fan connected in sequence. The dehumidifier and the second cloth bag bin are connected to the lower end of the first cloth bag bin via a first air lock.

[0017] In one embodiment, a material collection bin is connected to the lower end of the second cloth bag bin, and a second air lock is provided at the lower end of the material collection bin.

[0018] In one embodiment, the burner is a natural gas heating furnace.

[0019] Compared with the prior art, a spray drying waste heat recovery and utilization system provided by the present utility model has an atomizer disposed at the top of the drying tower, and the spray nozzle of the atomizer extends into the drying tower. The waste heat recovery unit includes a first cloth bag bin, an induced draft fan, a waste heat exchanger, a steam exchanger, a forced draft fan, and a burner connected in sequence. The lower end of the first cloth bag bin is connected to the first cloth bag bin, and the burner is connected to the top of the drying tower. The waste heat exchanger can initially heat the fresh air stream, and the steam exchanger can secondarily heat the fresh air stream. The burner can heat the fresh air stream to a predetermined temperature without consuming a large amount of fuel, which can effectively reduce energy consumption, reduce the production cost during spray drying, and reduce resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a spray drying waste heat recovery and utilization system provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] In order to solve the technical problems of high energy consumption during spray drying and low efficiency of waste heat recovery and utilization in the prior art, the utility model provides a spray drying waste heat recovery and utilization system, which can realize the recovery and utilization of waste heat and reduce energy consumption.

[0023] Please refer to Figure 1 , Figure 1 which is a spray drying waste heat recovery and utilization system in an embodiment of the utility model, including a drying tower 1, an atomizer 2 and a waste heat recovery unit 3. The atomizer 2 is arranged at the top of the drying tower 1, and the spray nozzle of the atomizer 2 extends into the drying tower 1; The waste heat recovery unit 3 includes a first bag filter bin 31, an induced draft fan 32, a waste heat exchanger 33, a steam exchanger 34, a supply fan 35 and a burner 36 connected in sequence. Among them, the lower end of the first bag filter bin 31 is communicated with the first bag filter bin 31, and the burner 36 is connected with the top of the drying tower 1.

[0024] It should be noted that the atomizer 2 is also connected with at least one feeding pump 21. In this specific embodiment, the number of feeding pumps 21 is two. The atomizer 2 sprays the solution into fine droplets and disperses them in the drying tower 1, contacts with the hot air flow in the drying tower 1, and uses the speed difference between the droplets and the hot air flow during the movement of the droplets to quickly dry the material within a few seconds.

[0025] On the basis of the above scheme, please refer to Figure 1 , a first temperature detector 37 is connected between the burner 36 and the drying tower 1, and a second temperature detector 38 is arranged between the drying tower 1 and the first bag filter bin 31. The first temperature detector 37 is used to detect the temperature of the air flow conveyed into the drying tower 1, and the second temperature detector 38 is used to detect the temperature of the air flow output from the drying tower 1.

[0026] In this specific embodiment, the waste heat exchanger 33 is used to initially heat the fresh air flow to 140 - 150 °C, and the burner 36 is used to secondarily heat the fresh air flow to 260 °C. Among them, the burner 36 is a natural gas heating furnace.

[0027] It should be noted that the external fresh air flow is conveyed into the waste heat exchanger 33 for initial heat exchange. Subsequently, the fresh air flow is conveyed into the steam exchanger 34 for secondary heat exchange. The steam exchanger 34 is communicated with the steam pipeline of the boiler, and can effectively recover and utilize the heat of the steam generated by the boiler in the production workshop.

[0028] On the basis of the above scheme, please refer to Figure 1, for the convenience of storing materials, specifically, it further includes a dehumidification unit 4. The dehumidification unit 4 includes a dehumidifier 41, a second cloth bag bin 42, and a material receiving fan 43 connected in sequence. The dehumidifier 41 and the second cloth bag bin 42 are connected to the lower end of the first cloth bag bin 31 via a first air lock 44.

[0029] In other embodiments, please refer to Figure 1 , the lower end of the second cloth bag bin 42 is connected to a material receiving bin 45, and a second air lock 46 is provided at the lower end of the material receiving bin 45.

[0030] To better understand the present invention, the following Figure 1 will be used to elaborate on the technical solution of the present invention in detail:

[0031] The solution is sprayed into fine droplets by the atomizer 2 and dispersed in the drying tower 1. The droplets come into contact with the hot air flow in the drying tower 1 for drying. At the same time, under the action of the induced draft fan 32, the hot air flow in the drying tower 1 is pumped into the waste heat heat exchanger 33 for primary heat exchange with the fresh air flow. Subsequently, the fresh air flow undergoes secondary heat exchange in the steam heat exchanger 34, and finally, after being heated to a predetermined temperature by the burner 36, it is transported into the drying tower 1.

[0032] The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A spray drying waste heat recovery system, characterized in that: include: Drying tower; an atomizer, the atomizer being arranged at the top of the drying tower, and the spray port of the atomizer extending into the drying tower; as well as, A waste heat recovery unit, the waste heat recovery unit includes a first bag bin, an induced draft fan, a waste heat heat exchanger, a steam heat exchanger, a blower and a burner connected in sequence, wherein the lower end of the first bag bin is connected to the first bag bin, and the burner is connected to the top of the drying tower.

2. A spray drying waste heat recovery system according to claim 1, characterized in that: The atomizer is also connected to at least one material extraction pump.

3. A spray drying waste heat recovery system according to claim 1, characterized in that: A first temperature detector is connected between the burner and the drying tower.

4. A spray drying waste heat recovery system according to claim 1, characterized in that: A second temperature detector is provided between the drying tower and the first bag bin.

5. The spray drying waste heat recovery system according to claim 1, characterized in that: The waste heat exchanger is used to initially heat the fresh air flow to 140-150°C.

6. A spray drying waste heat recovery system according to claim 5, characterized in that: The burner is used for secondary heat exchange of the fresh air flow to 260°C.

7. The spray drying waste heat recovery system according to claim 1, characterized in that: The steam heat exchanger is in communication with a steam pipeline of the boiler.

8. The spray drying waste heat recovery system according to claim 1, characterized in that: It also includes a dehumidification unit, which includes a dehumidifier, a second bag bin and a collecting fan connected in sequence, and the dehumidifier and the second bag bin are connected to the lower end of the first bag bin via a first closing fan.

9. A spray drying waste heat recovery system according to claim 8, characterized in that: The lower end of the second bag bin is connected to a material receiving bin, and the lower end of the material receiving bin is provided with a second air-blowing fan.

10. The spray drying waste heat recovery system according to claim 1, characterized in that: The burner is a natural gas heating furnace.

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