Fluidized bed drying device with waste heat recycling system

Abstract

The utility model relates to a fluidized bed drying device with a waste heat recycling system. The fluidized bed drying device comprises an air supply machine, a fluidized bed, a heat exchanger and a cold and hot all-in-one machine. Outdoor fresh air is filtered, cooled, dehumidified and heated by the air supply fan and is conveyed to the fluidized bed through a pipeline to treat materials, the materials enter the fluidized bed through the pipeline and are treated by the high-temperature dry air to become powder or particles, and exhausted gas exchanges heat with water in the heat exchanger and then is exhausted outdoors. The heat exchanger conveys heat into the cooling and heating all-in-one machine, the heat is sent to the air supply machine through heat exchange or heating circulation of the cooling and heating all-in-one machine and used for heating outdoor fresh air, the circulation is conducted in this way, waste heat in generated waste gas can be recycled in winter and used for the heating link in the technological production process, and the fuel amount of a coal-fired boiler in the heating link is reduced; and meanwhile, an exhaust system and a heating system are combined for heat exchange in an indirect heat exchange mode, and the effects that heat is utilized, and materials are not polluted are achieved.

Description

Technical Field

[0001] The present application relates to the field of particle powder drying, and in particular to a fluidized bed drying device with a waste heat recovery system. Background Art

[0002] Fluidized bed drying technology is a new drying technology developed in recent years. The process is that the bulk material is placed on the orifice plate, and the gas is transported from the bottom, causing the material particles to move on the gas distribution plate and be suspended in the airflow, producing a mixed bottom layer of material particles and gas, just like liquid boiling. In the fluidized bed dryer, the material particles are fully in contact with the gas in this mixed bottom layer, and heat and moisture transfer between the material and the gas are carried out. Fluidized bed drying has the advantages of high heat and mass transfer rates, high drying rate, high thermal efficiency, compact structure, low basic investment and maintenance costs, and easy operation. Therefore, fluidized bed dryers are widely used in chemical, food, ceramics, pharmaceuticals, polymers and other industries.

[0003] The existing fluidized bed drying device mainly includes: fluidized bed body, gas conveying system, material conveying system, control system and tail gas treatment system. Most fluidized bed drying devices are not equipped with waste heat recovery and utilization system, and there is still waste heat in the tail gas after treatment, resulting in heat waste. Fluidized bed drying devices equipped with waste heat recovery and utilization system are prone to contamination of materials during the recovery process. Utility Model Content

[0004] In view of this, the present application proposes a fluidized bed drying device with a waste heat recovery system, which can meet the needs of recycling waste heat from tail gas and ensure that the dried material will not be contaminated during the recovery process.

[0005] According to one aspect of the present application, a fluidized bed drying device with a waste heat recovery system is provided, comprising: a blower, a fluidized bed, a heat exchanger and a cooling and heating integrated machine.

[0006] The outlet end of the air supply fan is connected to the inlet end of the fluidized bed, and the outlet end of the fluidized bed is connected to the gas inlet end of the heat exchanger; two loop connections are arranged between the cold and hot integrated machine and the air supply fan, respectively forming a cooling cycle and a heating cycle, and the heat exchanger is connected to the liquid loop between the pipeline of the cooling cycle to form a heat extraction cycle; valves are respectively arranged on the two pipelines of the cooling cycle, and valves are respectively arranged on the two pipelines of the heat extraction cycle.

[0007] In one possible implementation, the integrated cold and hot machine includes: an evaporator, a condenser, a compressor and a throttle; the evaporator is connected to the air supply fan circuit, the condenser is connected to the air supply fan circuit, and the evaporator is arranged at the front end of the condenser; the evaporator, the compressor, the condenser and the throttle are connected in a serial circuit.

[0008] In one possible implementation, the first outlet and the first inlet of the evaporator are both connected to the pipeline between the air supply fan, and the first outlet and the first inlet of the condenser are both connected to the pipeline between the air supply fan; the second outlet of the evaporator is connected to the pipeline between the inlet of the compressor, the outlet of the compressor is connected to the second inlet of the condenser, the second outlet of the condenser is connected to the inlet of the throttle device, and the outlet of the throttle device is connected to the second inlet of the evaporator.

[0009] In a possible implementation, a pipeline is connected between the liquid outlet end of the heat exchanger and the first inlet end of the evaporator, and a pipeline is connected between the liquid inlet end of the heat exchanger and the first outlet end of the evaporator.

[0010] In one possible implementation, a first valve is arranged between the air supply fan and the first inlet of the evaporator, a second valve is arranged between the air supply fan and the first outlet of the evaporator, and the first valve and the second valve are arranged near one end of the air supply fan, a third valve is arranged between the liquid inlet end of the heat exchanger and the pipeline of the refrigeration cycle, and a fourth valve is arranged between the liquid outlet end of the heat exchanger and the pipeline of the refrigeration cycle.

[0011] In a possible implementation, a first liquid pump is provided on the cooling cycle, a second liquid pump is provided on the heating cycle, and a third liquid pump is provided between the fourth valve and the heat exchanger.

[0012] In one possible implementation, the air supply fan includes: a primary filter, a medium filter, a cooling dehumidifier, a heater, an air supply fan and a high-efficiency filter, the evaporator is connected to the cooling dehumidifier circuit, and the condenser is connected to the heater circuit.

[0013] In one possible implementation, the primary filter, the medium filter, the cooling dehumidifier, the heater, the air supply fan and the high efficiency filter are connected in sequence, and the high efficiency filter is arranged on one side of the outlet end of the air supply fan.

[0014] In a possible implementation, a dust collector and a dust removal fan are provided between the fluidized bed and the heat exchanger, and the dust collector is provided at the front end of the dust removal fan.

[0015] In one possible implementation, an exhaust fan is provided at the gas outlet end of the heat exchanger.

[0016] The beneficial effects of the present application are as follows: outdoor fresh air is filtered, cooled, dehumidified and heated by the air supply fan, and enters the fluidized bed. The high-temperature dry air generated by the above-mentioned air supply fan processes the fluidized material, and the material enters the fluidized bed through a pipeline and becomes powder or granular. The exhausted gas is discharged to the outdoors after heat exchange with water in the heat exchanger. The heat exchanger transports the heat to the integrated cold and hot machine, and through the heat exchange of the integrated cold and hot machine, it is sent to the air supply fan through a heating cycle to heat the outdoor fresh air. In this way, the waste heat in the exhaust gas can be recovered in winter and used for the heating link in the process production process, reducing the amount of fuel of the coal-fired boiler in the heating link, and at the same time using indirect heat exchange to combine the exhaust system with the heating system for heat exchange. According to the present application, a fluidized bed drying device with a waste heat recovery system achieves the effect of utilizing heat without polluting materials.

[0017] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0019] Figure 1 A connection structure diagram of a fluidized bed drying device with a waste heat recovery system according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0020] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0021] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0024] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0025] As shown in the figure, the fluidized bed drying device with a waste heat recovery system includes: an air supply fan 1, a fluidized bed 2, a heat exchanger 5 and a cold and hot integrated machine 7.

[0026] The outlet end of the air supply fan 1 is connected to the inlet end of the fluidized bed 2, and the outlet end of the fluidized bed 2 is connected to the gas inlet end of the heat exchanger 5; two loop connections are set between the cold and hot integrated machine 7 and the air supply fan 1, respectively forming a cooling cycle a and a heating cycle b, and the heat exchanger 5 is loop-connected with the pipeline of the cooling cycle a to form a heat extraction cycle c; valves are respectively set on the two pipelines of the cooling cycle a, and valves are respectively set on the two pipelines of the heat extraction cycle c.

[0027] Summer process flow: First, outdoor fresh air enters the air supply fan 1. After passing through the primary filter section, medium filter section, cooling and dehumidification section, heating section, and high-efficiency filter section, clean high-temperature air is produced and introduced into the fluidized bed 2, so that the material on the fluidized bed 2 forms a fluidized state. In the fluidized state, after the material is fully in contact with the high-temperature air and forms dry granular medicines, the high-temperature air becomes medium-temperature air and enters the dust removal equipment and is discharged by the fan. The working principle of the cooling, dehumidification and heating parts is that the cold water is provided by the cooling cycle a of the integrated cooling and heating heat pump: the refrigerant in the evaporator 7-4 absorbs the heat of the outdoor hot and humid air brought by the cooling cycle a, evaporates the liquid refrigerant in the evaporator 7-4 into a gaseous refrigerant and enters the compressor 7-1. The gaseous refrigerant is compressed by the compressor 7-1 and becomes a high-temperature and high-pressure gas. After entering the condenser 7-2 and releasing heat, it becomes a high-temperature and high-pressure liquid. That is, the heat is transferred from the refrigerant to the hot water in the heating cycle b and sent to the heater 1-4. The hot water in the heating cycle b heats the air in the heater 1-4 part. The high-temperature liquid refrigerant enters the throttle 7-3 and expands, and the state becomes a low-temperature and low-pressure liquid refrigerant and enters the evaporator 7-4, and the cycle continues.

[0028] Winter working conditions: Unlike summer, the air in winter is relatively dry and does not need cooling and dehumidification. The waste heat in the discharged air can be used to enter the air-water heat exchanger 5. After entering the heat exchanger 5, the heat is transferred to the heat extraction cycle c and then discharged into the air. The heated aqueous solution is transferred to the evaporator 7-4 as heat by the heat extraction cycle c through the third liquid pump 8-3. The liquid refrigerant in the evaporator 7-4 is evaporated into gaseous refrigerant and then enters the compressor 7-1, and the cycle is repeated.

[0029] In one possible implementation, the integrated cold and hot machine 7 includes: an evaporator 7-4, a condenser 7-2, a compressor 7-1 and a throttle 7-3; the evaporator 7-4 is connected to the circuit of the air supply fan 1, the condenser 7-2 is connected to the circuit of the air supply fan 1, and the evaporator 7-4 is arranged at the front end of the condenser 7-2; the evaporator 7-4, the compressor 7-1, the condenser 7-2 and the throttle 7-3 are connected in sequence.

[0030] In one possible implementation, the first outlet and the first inlet of the evaporator 7-4 are both connected to the pipeline between the air supply fan 1, and the first outlet and the first inlet of the condenser 7-2 are both connected to the pipeline between the air supply fan 1; the second outlet of the evaporator 7-4 is connected to the pipeline between the inlet of the compressor 7-1, the outlet of the compressor 7-1 is connected to the second inlet of the condenser 7-2, the second outlet of the condenser 7-2 is connected to the inlet of the throttle 7-3, and the outlet of the throttle 7-3 is connected to the second inlet of the evaporator 7-4.

[0031] In a possible implementation, the liquid outlet end of the heat exchanger 5 is connected to the first inlet of the evaporator 7 - 4 by a pipeline, and the liquid inlet end of the heat exchanger 5 is connected to the first outlet of the evaporator 7 - 4 by a pipeline.

[0032] In one possible implementation, a first valve is arranged between the air supply fan 1 and the first inlet of the evaporator 7-4, a second valve is arranged between the air supply fan 1 and the first outlet of the evaporator 7-4, and the first valve and the second valve are arranged close to one end of the air supply fan 1, a third valve is arranged between the liquid inlet end of the heat exchanger 5 and the pipeline of the cooling cycle a, and a fourth valve is arranged between the liquid outlet end of the heat exchanger 5 and the pipeline of the cooling cycle a.

[0033] In a possible implementation, a first liquid pump 8 - 1 is provided on the cooling cycle a, a second liquid pump 8 - 2 is provided on the heating cycle b, and a third liquid pump 8 - 3 is provided between the fourth valve and the heat exchanger 5 .

[0034] In one possible implementation, the air supply fan 1 includes: a primary filter 1-1, a medium efficiency filter 1-2, a cooling dehumidifier 1-3, a heater 1-4, a blower 1-5 and a high efficiency filter 1-6, the evaporator 7-4 is connected to the cooling dehumidifier 1-3 circuit, and the condenser 7-2 is connected to the heater 1-4 circuit.

[0035] In one possible implementation, the primary filter 1-1, the medium filter 1-2, the cooling dehumidifier 1-3, the heater 1-4, the air supply fan 1-5 and the high efficiency filter 1-6 are connected in sequence, and the high efficiency filter 1-6 is arranged on the outlet side of the air supply fan 1.

[0036] In a possible implementation, a dust collector 3 and a dust removal fan 4 are arranged between the fluidized bed 2 and the heat exchanger 5 , and the dust collector 3 is arranged at the front end of the dust removal fan 4 .

[0037] In a possible implementation, an exhaust fan 6 is provided at the gas outlet end of the heat exchanger 5 .

[0038] Summer working conditions: turn off the third liquid pump 8-3, open the first valve and the second valve, and close the third valve and the fourth valve. (1) The air supply fan 1 processes the fresh air introduced from the outside, and sends it to the fluidized bed 2 after filtering, cooling and dehumidifying, heating, and re-filtering. The cold water used to cool and dehumidify the air and the hot water used to heat the air in step 1 are both provided by the integrated heat pump. After the fresh air passes through the primary and secondary filtrations, it undergoes heat exchange and dehumidification with the cold water in the cooling cycle a in the cooling and dehumidification section, and then enters the heating section. At this time, the hot water in the heating cycle b in the integrated heat pump transfers heat to the air to complete the heating, and then it is sent to the next step; (2) The high-temperature air in step 1 enters the fluidized bed 2 to dry the material and turn it into granular or powdery form; (3) The air after the material processing is completed enters the dust collector 3, and the gas discharged from the dust collector is discharged to the outside by the exhaust fan 6 after being filtered and qualified.

[0039] Winter working conditions: turn off the first liquid pump 8-1, open the third valve and the fourth valve, and close the first valve and the second valve. (1) The air supply fan 1 processes the fresh air introduced from the outside, and sends it to the fluidized bed 2 after filtering, heating, and re-filtering; (2) The high-temperature air in step 1 enters the fluidized bed 2 to dry the material and turn it into granules or powders, and enters the dust collector 3 after the treatment of the medicine; (3) The gas discharged from the dust collector exchanges heat with water in the heat exchanger 5 and is discharged to the outside; (4) The heated circulating water in step 4 is sent to the integrated cold and hot machine through the third liquid pump 8-3, and sent to the heating section through the integrated cold and hot heat pump through the heating cycle b, and so on.

[0040] It should be noted that although the present application is used as an example to introduce a fluidized bed drying device with a waste heat recovery system, those skilled in the art will understand that the present application should not be limited thereto. In fact, the user can flexibly set various parameters according to personal preferences and / or actual application scenarios, as long as the design is reasonable.

[0041] In this way, the outdoor fresh air is filtered, cooled, dehumidified and heated by the air supply fan to generate high-temperature dry gas, which then enters the fluidized bed to treat the medicine, turning it into powder or granular form. The gas after treating the medicine is discharged to the outside after heat exchange with water in the heat exchanger. The heat exchanger transports the heat to the cold and hot all-in-one machine, and through the heat exchange of the cold and hot all-in-one machine, it is sent to the air supply fan through a heating cycle to heat the outdoor fresh air. In this way, the waste heat in the exhaust gas can be recovered in winter and used in the heating link in the process production flow, reducing the amount of fuel of the coal-fired boiler in the heating link. At the same time, the exhaust system and the heating system are combined for heat exchange by indirect heat exchange. According to the present application, a fluidized bed drying device with a waste heat recovery system achieves the effect of utilizing heat without polluting materials.

[0042] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A fluidized bed drying device with a waste heat recovery system, characterized in that: include: Air supply fan, fluidized bed, heat exchanger and hot and cold all-in-one machine; The outlet end of the air supply fan is connected to the inlet end of the fluidized bed, and the outlet end of the fluidized bed is connected to the gas inlet end of the heat exchanger; Two circuit connections are provided between the cooling and heating integrated machine and the air supply fan, forming a cooling cycle and a heating cycle respectively, and a liquid circuit is connected between the heat exchanger and the pipeline of the cooling cycle to form a heat extraction cycle; The two pipelines of the cooling cycle are respectively provided with valves, and the two pipelines of the heat extraction cycle are respectively provided with valves.

2. The fluidized bed drying device with waste heat recovery system according to claim 1, characterized in that: The integrated cooling and heating machine comprises: an evaporator, a condenser, a compressor and a throttle; The evaporator is connected to the air supply fan circuit, the condenser is connected to the air supply fan circuit, and the evaporator is arranged at the front end of the condenser; The evaporator, the compressor, the condenser and the throttle are connected in a loop in sequence.

3. The fluidized bed drying device with waste heat recovery system according to claim 2, characterized in that: The first outlet and the first inlet of the evaporator are both connected to the pipeline between the air supply fans, and the first outlet and the first inlet of the condenser are both connected to the pipeline between the air supply fans; The second outlet of the evaporator is connected to the inlet of the compressor by a pipeline, the outlet of the compressor is connected to the second inlet of the condenser by a pipeline, the second outlet of the condenser is connected to the inlet of the throttle by a pipeline, and the outlet of the throttle is connected to the second inlet of the evaporator by a pipeline.

4. The fluidized bed drying device with waste heat recovery system according to claim 3 is characterized in that: The liquid outlet end of the heat exchanger is connected to the first inlet of the evaporator through a pipeline, and the liquid inlet end of the heat exchanger is connected to the first outlet of the evaporator through a pipeline.

5. The fluidized bed drying device with waste heat recovery system according to claim 4, characterized in that: A first valve is arranged between the air supply fan and the first inlet of the evaporator, a second valve is arranged between the air supply fan and the first outlet of the evaporator, and the first valve and the second valve are arranged close to one end of the air supply fan; a third valve is arranged between the liquid inlet end of the heat exchanger and the pipeline of the cooling cycle, and a fourth valve is arranged between the liquid outlet end of the heat exchanger and the pipeline of the cooling cycle.

6. The fluidized bed drying device with waste heat recovery system according to claim 5, characterized in that: The cooling cycle is provided with a first liquid pump, the heating cycle is provided with a second liquid pump, and a third liquid pump is provided between the fourth valve and the heat exchanger.

7. The fluidized bed drying device with waste heat recovery system according to claim 6, characterized in that: The air supply fan comprises: a primary filter, a medium filter, a cooling dehumidifier, a heater, an air supply fan and a high-efficiency filter; the evaporator is connected to the cooling dehumidifier circuit, and the condenser is connected to the heater circuit.

8. The fluidized bed drying device with waste heat recovery system according to claim 7, characterized in that: The primary filter, the medium filter, the cooling dehumidifier, the heater, the air supply fan and the high efficiency filter are connected in sequence, and the high efficiency filter is arranged on one side of the outlet end of the air supply fan.

9. The fluidized bed drying device with a waste heat recovery system according to any one of claims 1 to 6, characterized in that: A dust collector and a dust removal fan are arranged between the fluidized bed and the heat exchanger, and the dust collector is arranged at the front end of the dust removal fan.

10. The fluidized bed drying device with a waste heat recovery system according to any one of claims 1 to 6, characterized in that: An exhaust fan is provided at the gas outlet end of the heat exchanger.

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