Fluidized bed heat recycling system

Abstract

The utility model relates to an automatic control system for material drying. The fluidized bed heat recycling system comprises an air heating system, the air heating system is provided with an air inlet and an air outlet, the air outlet is communicated to the bottom of a fluidized bed, the fluidized bed is further provided with an air outlet, the air source heat pump system is provided with an evaporator and a condenser, the evaporator is arranged on the air outlet of the fluidized bed, and the condenser is arranged on the air outlet of the fluidized bed. The condenser is arranged in an air inlet of the air heating system; waste heat is transferred to the condenser end of the air source heat pump system from the air outlet of the fluidized bed through the evaporator end of the air source heat pump system, and cold air is released and preheated in the air inlet of the air heating system, so that the energy consumption of the air heating system for heating air is reduced, and the waste heat recycling problem is solved.

Description

Technical Field

[0001] The utility model relates to an automatic control system for material drying, in particular to a fluidized bed. Background Art

[0002] Fluidized bed, abbreviated as fluidized bed, is a reactor that uses gas or liquid to pass through a granular solid layer to put solid particles in a suspended motion state and carry out a gas-solid phase reaction process or a liquid-solid phase reaction process.

[0003] Fluidized bed has the advantages of energy saving and environmental protection. In recent years, it has been widely used in many industries and has become the main type of drying equipment, mainly used for drying granular and powdered materials, such as monosodium glutamate processing, sugar, salt, and various tablet particles in the pharmaceutical field.

[0004] During the operation of the fluidized bed, high-temperature and high-speed air needs to be blown in from the bottom of the fluidized bed. The bed layer is lifted by the airflow, and the particles in the bed begin to fluidize. The high-temperature gas transfers heat to the material. At the same time, part of the hot gas is discharged from the exhaust port along with the vaporization of water, forming waste heat and wasting heat. Utility Model Content

[0005] The purpose of the utility model is to provide a fluidized bed heat recovery and reuse system to solve at least one of the above technical problems.

[0006] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0007] The fluidized bed heat recovery and reuse system includes an air heating system, the air heating system has an air inlet and an air outlet, the air outlet is connected to the bottom of the fluidized bed, the fluidized bed also has an air outlet, and also includes an air source heat pump system, the air source heat pump system has an evaporator and a condenser, the evaporator is arranged on the air outlet of the fluidized bed, and the condenser is arranged in the air inlet of the air heating system;

[0008] The evaporator has a liquid refrigerant inlet and a gaseous refrigerant outlet;

[0009] The condenser has a gaseous refrigerant inlet and a liquid refrigerant outlet;

[0010] Also included is a heat pump compressor, the heat pump compressor includes a suction port and an exhaust port, the suction port pipeline of the heat pump compressor is connected to the gaseous refrigerant outlet of the evaporator, and the exhaust port pipeline of the heat pump compressor is connected to the gaseous refrigerant inlet of the condenser;

[0011] It also includes an expansion valve, which includes a high-pressure end and a low-pressure end. The high-pressure end pipeline of the expansion valve is connected to the liquid refrigerant outlet of the condenser, and the low-pressure end pipeline of the expansion valve is connected to the liquid refrigerant inlet of the evaporator.

[0012] In the above design, the evaporator is arranged on the exhaust port of the fluidized bed, and the waste heat discharged from the exhaust port is heat exchanged with the liquid refrigerant in the evaporator. The liquid refrigerant absorbs a large amount of waste heat while evaporating and vaporizing. The gaseous refrigerant is compressed by the heat pump compressor to form a high-pressure and high-temperature gaseous refrigerant. The high-pressure and high-temperature refrigerant reaches the condenser through a pipeline. The condenser is arranged in the air inlet of the air heating system. The cold air and the high-temperature refrigerant in the condenser are heat exchanged, and the high-temperature heat in the refrigerant is transferred to the cold air, so that the cold air is heated. Its beneficial effect is that the waste heat from the exhaust port is recovered by the heat pump and reused to heat the cold air at the air inlet of the air heating system, thereby saving the energy consumption of heating the cold air.

[0013] Further, the evaporator includes a wound tube heat exchanger, referred to as an evaporator heat exchanger;

[0014] The evaporator heat exchanger has a cylindrical shell, the shell has an air inlet and an air outlet for circulating hot air in the fluidized bed, and a liquid refrigerant inlet and a gaseous refrigerant outlet are arranged on the outer wall of the shell, the liquid refrigerant inlet is arranged on one side of the air outlet, and the gaseous refrigerant outlet is arranged on one side of the air inlet;

[0015] The air inlet of the evaporator heat exchanger is connected to the air outlet of the fluidized bed;

[0016] The condenser includes a wound tube heat exchanger, called a condenser heat exchanger;

[0017] The condenser heat exchanger has a cylindrical shell, the shell has an air inlet and an air outlet for air circulation, and a gaseous refrigerant inlet and a liquid refrigerant outlet are arranged on the outer wall of the shell, the gaseous refrigerant inlet is arranged on one side of the shell air outlet, and the liquid refrigerant outlet is arranged on one side of the shell air inlet;

[0018] The air outlet of the condenser heat exchanger is connected to the air inlet of the air heating system, and the air inlet of the condenser heat exchanger is provided with an air filter device.

[0019] In the above design, the wound tube heat exchanger is made of one or more groups of spirally wound tubes placed in a shell. These tubes are divided into inner tubes and outer tubes. The cold and hot fluids exchange heat in countercurrent in the inner and outer tubes. The inner and outer tubes of the wound tube have a large heat transfer area. Therefore, the beneficial effect of using a wound tube heat exchanger for the evaporator and condenser is that the heat exchange efficiency between the refrigerant and the gas can be improved.

[0020] Further optimized, the air filter device includes a coarse filter PP cotton and a fine filter PP cotton, and an activated carbon adsorption layer is also included between the coarse filter PP cotton and the fine filter PP cotton;

[0021] The coarse filter PP cotton is arranged at the outermost layer of the air inlet, and the filter particle size is 10μm; the fine filter PP cotton filter particle size is 1-5μm; the activated carbon adsorption layer adopts a coconut fiber carbon layer with a filling thickness of 5-20mm.

[0022] In the above design, an air filter device is provided at the air inlet of the condenser heat exchanger for intercepting and filtering suspended particulate matter in the air. The air filter device includes coarse filter PP cotton, activated carbon and fine filter PP cotton. The beneficial effect of the PP cotton being divided into two layers of coarse filter and fine filter is that, on the one hand, the coarse filter is prone to accumulate a large amount of ash layer, and the separate settings can realize the separate replacement of the coarse filter PP cotton, thereby increasing the service life of the activated carbon and the fine filter PP cotton. On the other hand, the two layers of PP cotton can provide coating support for the activated carbon to prevent the activated carbon adsorption layer from losing activated carbon particles.

[0023] Furthermore, the refrigerant pipeline between the evaporator and the heat pump compressor, and the refrigerant pipeline between the heat pump compressor and the condenser are both provided with a thermal insulation layer on the outer wall of the pipeline.

[0024] The above design provides a thermal insulation layer on the outer wall of the refrigerant pipe, which prevents heat loss, waste of heat, and reduction of heat recovery efficiency.

[0025] Furthermore, the air heating system includes a heater having a temperature control input interface for controlling the heating temperature; and also includes a temperature detection system, which includes a temperature sensor and a temperature controller;

[0026] The temperature sensor includes a temperature measuring part and a temperature signal output interface, and the temperature measuring part of the temperature sensor is arranged at the bottom of the fluidized bed; the temperature controller includes a temperature signal input interface and a temperature adjustment output interface, the temperature signal output interface of the temperature sensor is connected to the temperature signal input interface of the temperature controller, and the temperature adjustment output interface of the temperature controller is connected to the temperature control input interface of the heater.

[0027] In the above design, a temperature sensor is arranged at the bottom of the fluidized bed to monitor the hot air temperature in real time, and the heater of the air heating system is controlled by the temperature controller according to the detection result to adjust the temperature in the fluidized bed. The beneficial effect is to keep the temperature in the fluidized bed within the optimal temperature range, prevent excessive temperature fluctuations in the fluidized bed due to waste heat reuse, and improve the working efficiency of fluidized bed drying materials.

[0028] Further optimization is carried out in which a metal bracket is provided at the bottom of the fluidized bed as a temperature sensor bracket for installing the temperature sensor; the temperature sensor bracket is provided with a mounting hole, the mounting hole is lined with a ceramic ring bushing, and the temperature measuring part of the temperature sensor is embedded in the ceramic ring bushing, thereby fixing the temperature sensor at the bottom of the fluidized bed.

[0029] In the above design, the metal bracket is used to fix the temperature sensor, and the ceramic ring bushing lined in the mounting hole between the metals has the beneficial effect of providing thermal insulation protection and ensuring the temperature detection accuracy of the temperature sensor.

[0030] The utility model transfers the waste heat discharged from the exhaust port of the fluidized bed to the air inlet of the air heating system to preheat the cold air through the air source heat pump system, which has the beneficial effect of saving the energy consumption of the air heating system for air heating; a temperature detection system is also provided, which monitors the hot air temperature in real time and controls the heater of the air heating system through the temperature controller according to the detection result, which has the beneficial effect of keeping the temperature in the fluidized bed within the optimal temperature range, preventing excessive temperature fluctuations in the fluidized bed due to the reuse of waste heat, and improving the working efficiency of the fluidized bed drying materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0032] Figure 1 It is a schematic diagram of the heat recovery and reuse system;

[0033] Figure 2 It is a schematic diagram of the appearance of a cylindrical shell.

[0034] Explanation of symbols:

[0035] 1. Exhaust port; 2. Evaporator; 3. Heat pump compressor; 4. Expansion valve; 5. Condenser; 6. Heater; 7. Temperature controller; 8. Temperature sensor; 9. Air outlet; 10. Air inlet; 11. Refrigerant inlet; 12. Refrigerant outlet. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0039] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Reference Figure 1 As shown, the fluidized bed heat recovery and reuse system includes an air heating system, the air heating system has an air inlet and an air outlet, the air outlet is connected to the bottom of the fluidized bed, the fluidized bed also has an air outlet, and also includes an air source heat pump system, the air source heat pump system has an evaporator 2 and a condenser 5, the evaporator 2 is arranged on the air outlet of the fluidized bed, and the condenser 5 is arranged in the air inlet of the air heating system;

[0041] The evaporator 2 has a liquid refrigerant inlet and a gaseous refrigerant outlet;

[0042] The condenser 5 has a gaseous refrigerant inlet and a liquid refrigerant outlet;

[0043] The heat pump compressor 3 is also included. The heat pump compressor 3 includes an inlet and an outlet 1. The inlet pipe of the heat pump compressor 3 is connected to the gaseous refrigerant outlet of the evaporator 2, and the outlet pipe 1 of the heat pump compressor 3 is connected to the gaseous refrigerant inlet of the condenser 5.

[0044] It also includes an expansion valve 4, which includes a high-pressure end and a low-pressure end. The high-pressure end pipeline of the expansion valve 4 is connected to the liquid refrigerant outlet of the condenser 5, and the low-pressure end pipeline of the expansion valve 4 is connected to the liquid refrigerant inlet of the evaporator 2.

[0045] In this embodiment, the evaporator 2 is arranged on the fluidized bed exhaust port 1, and the waste heat discharged from the exhaust port 1 is heat exchanged with the liquid refrigerant in the evaporator 2. The liquid refrigerant absorbs a large amount of waste heat while evaporating and vaporizing. The gaseous refrigerant is compressed by the heat pump compressor 3 to form a high-pressure and high-temperature gaseous refrigerant. The high-pressure and high-temperature refrigerant reaches the condenser 5 through a pipeline. The condenser 5 is arranged in the air inlet of the air heating system. The cold air and the high-temperature refrigerant in the condenser 5 are heat exchanged, and the high-temperature heat in the refrigerant is transferred to the cold air, so that the cold air is heated. Its beneficial effect is that the waste heat from the exhaust port 1 is recycled by the heat pump and reused to heat the cold air at the air inlet of the air heating system, thereby saving the energy consumption of heating the cold air.

[0046] Evaporator 2 includes a wound tube heat exchanger, referred to as evaporator 2 heat exchanger;

[0047] The evaporator 2 heat exchanger has a cylindrical shell, the shell has an air inlet 10 and an air outlet 9 for allowing hot air in the fluidized bed to circulate, and a liquid refrigerant inlet 11 and a gaseous refrigerant outlet 12 are arranged on the outer wall of the shell, the liquid refrigerant inlet 11 is arranged on one side of the air outlet 9, and the gaseous refrigerant outlet 12 is arranged on one side of the air inlet 10;

[0048] The air inlet 10 of the heat exchanger of the evaporator 2 is connected to the air outlet of the fluidized bed;

[0049] Condenser 5 includes a wound tube heat exchanger, referred to as condenser 5 heat exchanger;

[0050] The condenser 5 heat exchanger has a cylindrical shell, the shell has an air inlet 10 and an air outlet 9 for air circulation, and a gas refrigerant inlet 11 and a liquid refrigerant outlet 12 are arranged on the outer wall of the shell, the gas refrigerant inlet 11 is arranged on one side of the shell air outlet 9, and the liquid refrigerant outlet 12 is arranged on one side of the shell air inlet 10;

[0051] The air outlet 9 of the heat exchanger of the condenser 5 is connected to the air inlet of the air heating system, and the air inlet 10 of the heat exchanger of the condenser 5 is provided with an air filter device.

[0052] In this embodiment, the wound tube heat exchanger is made of one or more groups of spirally wound tubes placed in a shell, and these tubes are divided into inner tubes and outer tubes. The cold and hot fluids exchange heat in the inner and outer tubes in countercurrent. The inner and outer tubes of the wound tube have a large heat transfer area. Therefore, the beneficial effect of using a wound tube heat exchanger for the evaporator 2 and the condenser 5 is that the heat exchange efficiency between the refrigerant and the gas can be improved.

[0053] The air filter device includes a coarse filter PP cotton and a fine filter PP cotton, and an activated carbon adsorption layer is included between the coarse filter PP cotton and the fine filter PP cotton;

[0054] The coarse filter PP cotton is arranged at the outermost layer of the air inlet, and the filter particle size is 10μm; the fine filter PP cotton filter particle size is 1-5μm; the activated carbon adsorption layer adopts a coconut fiber carbon layer with a filling thickness of 5-20mm.

[0055] In this embodiment, an air filter device is provided at the air inlet 10 of the condenser 5 heat exchanger for intercepting and filtering suspended particulate matter in the air. The air filter device includes coarse filter PP cotton, activated carbon and fine filter PP cotton. The beneficial effect of the PP cotton being divided into two layers of coarse filter and fine filter is that, on the one hand, the coarse filter is prone to accumulate a large amount of ash layer, and the separate settings can realize the separate replacement of the coarse filter PP cotton, thereby increasing the service life of the activated carbon and the fine filter PP cotton. On the other hand, the two layers of PP cotton can provide coating support for the activated carbon to prevent the activated carbon adsorption layer from losing activated carbon particles.

[0056] The refrigerant pipeline between the evaporator 2 and the heat pump compressor 3, and the refrigerant pipeline between the heat pump compressor 3 and the condenser 5, are both provided with a thermal insulation layer on the outer wall of the pipeline.

[0057] In this embodiment, a thermal insulation layer is provided on the outer wall of the refrigerant pipe, which serves to prevent heat loss, heat waste, and reduction in heat recovery efficiency.

[0058] The air heating system includes a heater having a temperature control input interface for controlling the heating temperature; and also includes a temperature detection system including a temperature sensor and a temperature controller;

[0059] The temperature sensor includes a temperature measuring part and a temperature signal output interface, and the temperature measuring part of the temperature sensor is arranged at the bottom of the fluidized bed; the temperature controller includes a temperature signal input interface and a temperature adjustment output interface, the temperature signal output interface of the temperature sensor is connected to the temperature signal input interface of the temperature controller, and the temperature adjustment output interface of the temperature controller is connected to the temperature control input interface of the heater.

[0060] In this embodiment, a temperature sensor 8 is provided at the bottom of the fluidized bed to monitor the hot air temperature in real time, and the heater 6 of the air heating system is controlled by the temperature controller 7 according to the detection result to adjust the temperature in the fluidized bed. The beneficial effect is to keep the temperature in the fluidized bed within the optimal temperature range, prevent excessive temperature fluctuations in the fluidized bed due to waste heat reuse, and improve the working efficiency of the fluidized bed drying materials.

[0061] A metal bracket is provided at the bottom of the fluidized bed as a temperature sensor bracket for installing the temperature sensor; the temperature sensor bracket is provided with a mounting hole, the mounting hole is lined with a ceramic ring bushing, and the temperature measuring part of the temperature sensor is embedded in the ceramic ring bushing, thereby fixing the temperature sensor at the bottom of the fluidized bed.

[0062] In this embodiment, the metal bracket is used to fix the temperature sensor, and the ceramic ring bushing lined in the metal mounting hole has the beneficial effect of providing thermal insulation protection and ensuring the temperature detection accuracy of the temperature sensor.

[0063] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0064] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A fluidized bed heat recovery and reuse system, comprising an air heating system, the air heating system having an air inlet and an air outlet, the air outlet being connected to the bottom of the fluidized bed, the fluidized bed also having an air outlet, characterized in that: Also included is an air source heat pump system, the air source heat pump system has an evaporator and a condenser, the evaporator is arranged on the air outlet of the fluidized bed, and the condenser is arranged in the air inlet of the air heating system; The evaporator has a liquid refrigerant inlet and a gaseous refrigerant outlet; The condenser has a gaseous refrigerant inlet and a liquid refrigerant outlet; Also included is a heat pump compressor, the heat pump compressor includes a suction port and an exhaust port, the suction port pipeline of the heat pump compressor is connected to the gaseous refrigerant outlet of the evaporator, and the exhaust port pipeline of the heat pump compressor is connected to the gaseous refrigerant inlet of the condenser; It also includes an expansion valve, which includes a high-pressure end and a low-pressure end. The high-pressure end pipeline of the expansion valve is connected to the liquid refrigerant outlet of the condenser, and the low-pressure end pipeline of the expansion valve is connected to the liquid refrigerant inlet of the evaporator.

2. The fluidized bed heat recovery and reuse system according to claim 1, characterized in that: The evaporator includes a wound tube heat exchanger, called the evaporator heat exchanger; The evaporator heat exchanger has a cylindrical shell, the shell has an air inlet and an air outlet for circulating hot air in the fluidized bed, and a liquid refrigerant inlet and a gaseous refrigerant outlet are arranged on the outer wall of the shell, the liquid refrigerant inlet is arranged on one side of the air outlet, and the gaseous refrigerant outlet is arranged on one side of the air inlet; The air inlet of the evaporator heat exchanger is connected to the air outlet of the fluidized bed; The condenser includes a wound tube heat exchanger, called a condenser heat exchanger; The condenser heat exchanger has a cylindrical shell, the shell has an air inlet and an air outlet for air circulation, and a gaseous refrigerant inlet and a liquid refrigerant outlet are arranged on the outer wall of the shell, the gaseous refrigerant inlet is arranged on one side of the shell air outlet, and the liquid refrigerant outlet is arranged on one side of the shell air inlet; The air outlet of the condenser heat exchanger is connected to the air inlet of the air heating system, and the air inlet of the condenser heat exchanger is provided with an air filter device.

3. The fluidized bed heat recovery and reuse system according to claim 1, characterized in that: The air filter device includes a coarse filter PP cotton and a fine filter PP cotton, and an activated carbon adsorption layer is included between the coarse filter PP cotton and the fine filter PP cotton; The coarse filter PP cotton is set at the outermost layer of the air inlet, and the filter particle size is 10μm; The fine filter PP cotton filter particle size is 1 to 5 μm; The activated carbon adsorption layer adopts a coconut fiber carbon layer with a filling thickness of 5 to 20 mm.

4. The fluidized bed heat recovery and reuse system according to claim 1, characterized in that: The refrigerant pipeline between the evaporator and the heat pump compressor, as well as the refrigerant pipeline between the heat pump compressor and the condenser, are both provided with a thermal insulation layer on the outer wall of the pipeline.

5. The fluidized bed heat recovery and reuse system according to claim 1, characterized in that: The air heating system includes a heater, and the heater has a temperature control input interface for controlling the heating temperature; It also includes a temperature detection system, which includes a temperature sensor and a temperature controller; The temperature sensor comprises a temperature measuring part and a temperature signal output interface, and the temperature measuring part of the temperature sensor is arranged at the bottom of the fluidized bed; The temperature controller includes a temperature signal input interface and a temperature adjustment output interface. The temperature signal output interface of the temperature sensor is connected to the temperature signal input interface of the temperature controller, and the temperature adjustment output interface of the temperature controller is connected to the temperature control input interface of the heater.

6. The fluidized bed heat recovery and reuse system according to claim 5, characterized in that: A metal bracket is provided at the bottom of the fluidized bed, serving as a temperature sensor bracket for installing a temperature sensor; The temperature sensor bracket is provided with a mounting hole, the mounting hole is lined with a ceramic ring bushing, and the temperature measuring part of the temperature sensor is embedded in the ceramic ring bushing, so that the temperature sensor is fixed on the bottom of the fluidized bed.

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