CN115164511B - Paint slag drying method, paint slag drying system and control method of paint slag drying system - Google Patents

Paint slag drying method, paint slag drying system and control method of paint slag drying system Download PDF

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Publication number
CN115164511B
CN115164511B CN202210785314.1A CN202210785314A CN115164511B CN 115164511 B CN115164511 B CN 115164511B CN 202210785314 A CN202210785314 A CN 202210785314A CN 115164511 B CN115164511 B CN 115164511B
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China
Prior art keywords
drying
paint slag
gas
temperature
drying chamber
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CN115164511A (en
Inventor
杨智
赵俊文
刘秀成
毛元敬
陈颖
罗向龙
陈健勇
梁颖宗
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Guangdong University of Technology
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Guangdong University of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/04—Agitating, stirring, or scraping devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/041—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying flowable materials, e.g. suspensions, bulk goods, in a continuous operation, e.g. with locks or other air tight arrangements for charging/discharging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention discloses a paint slag drying method, which comprises the following steps: stirring the paint slag to be dried and the heat storage particles, and introducing high-temperature gas in the stirring process to preheat the paint slag to be dried to obtain a soup-base-shaped paint slag mixture; and (5) drying the paint slag mixture for a plurality of times. According to the invention, the paint slag and the heat storage particles are stirred into the paint slag mixture, and the heat storage particles are utilized to increase the heat conductivity and specific heat capacity of the paint slag mixture, so that the moisture in the paint slag is easier to evaporate, and the drying effect and efficiency of the paint slag are improved.

Description

Paint slag drying method, paint slag drying system and control method of paint slag drying system
Technical Field
The invention relates to the field of hazardous waste treatment, in particular to a paint slag drying method, a paint slag drying system and a paint slag control method.
Background
A large amount of paint waste residues generated on modern industrial coating lines belong to HW12 dyes and paint waste in the national hazardous waste directory, and if the paint waste residues are not properly treated, the environment is seriously polluted, and meanwhile, the paint waste residues are also extremely wasted. At present, the disposal of the wastes is generally realized by landfill, incineration and recycling, and the waste enterprises pay high disposal fees each year. From the national environmental protection policy and the production cost of enterprises, the reduction, harmless and recycling of paint waste residues become necessary choices for waste enterprises, and particularly the reduction treatment of the paint waste residues needs to be urgently solved. Aiming at the reduction method of the paint waste residues, a great deal of research and practice exist at home and abroad, but the existing reduction method has the defects of low reduction rate, high unit drying energy consumption, incapability of continuous treatment and the like due to the characteristics of high water content, high viscosity, difficult transportation and difficult drying of the paint waste residues, and is difficult to popularize on a large scale.
Aiming at the problem of high energy consumption of drying of a paint slag drying unit, the invention discloses a paint slag drying method, which comprises a paint slag drying system, wherein the paint slag drying system comprises a primary filtering device, a preheating device, a dosing device, a drying host and a tail gas treatment device, and paint slag enters the primary filtering device to be buffered and pretreated; the preheating device is respectively communicated with the primary filtering device, the dosing device and the drying main machine, and the drying main machine is communicated with the tail gas treatment device through a vacuum pipeline. Although the paint waste residue drying method improves the reduction rate of the paint waste residue, reduces the unit drying energy consumption of the paint waste residue, and realizes the continuous drying reduction treatment of the paint waste residue. However, the method is characterized in that the resin protective agent is continuously added through the dosing device to break the viscosity of the paint waste residue, the continuous quantitative conveying of the paint waste residue is only convenient, and the drying effect of the paint waste residue is not improved, so that the drying effect of the paint waste residue is poor.
Disclosure of Invention
The invention provides a paint slag drying method, a paint slag drying system and a control method thereof, which aim to overcome the defects of poor paint slag drying effect and the like in the prior art.
The technical means adopted for realizing the aim of the invention are as follows:
the paint slag drying method is characterized by comprising the following steps of:
step 1: stirring the paint slag to be dried and the heat storage particles, and introducing high-temperature gas in the stirring process to preheat the paint slag to be dried to obtain a soup-base-shaped paint slag mixture;
step 2: and (5) drying the paint slag mixture for a plurality of times.
In the technical means, paint slag and heat storage particles are stirred into a paint slag mixture, and the heat storage particles are utilized to increase the heat conductivity and specific heat capacity of the paint slag mixture, so that the moisture in the paint slag is easier to evaporate; in addition, the invention preheats the paint slag, thereby improving the drying effect and efficiency of the paint slag.
The invention also provides a paint slag drying system, which comprises:
the stirring device is used for stirring paint slag to be dried and heat storage particles, and preheating the paint slag to obtain a paint slag mixture;
the drying device is used for drying the paint slag mixture for a plurality of times by utilizing high-temperature drying gas;
the storage device is used for storing the dried paint slag mixture;
a heat regulating system for supplying the high temperature drying gas to the drying device and the stirring device;
wherein, a conveying pipe for conveying paint slag mixture is arranged between the stirring device and the drying device and between the drying device and the storage device; the output end of the heat regulating system is connected with the air inlet end of the drying device, and the air outlet end of the stirring device is connected with the input end of the heat regulating system; and tail gas discharged by the drying device is transmitted to the stirring device.
The invention also provides a control method of the paint slag drying system, which comprises the following steps:
controlling the stirring device, the drying device and the heat regulating system to work; wherein the heat regulating system provides high-temperature drying gas to the drying device and the stirring device; stirring paint slag and heat accumulating particles to be dried by a stirring device, preheating the paint slag and the heat accumulating particles to obtain a paint slag mixture, and transmitting the paint slag mixture to a drying device through a conveying pipe; the drying device performs drying treatment on the paint slag mixture for a plurality of times by utilizing high-temperature drying gas, and then the paint slag mixture is transmitted to the storage device for storage through the conveying pipe.
Drawings
FIG. 1 is a flow chart of the method of drying paint slag in example 1;
FIG. 2 is a flow chart of the method of drying paint slag in example 2;
FIG. 3 is a schematic diagram of a paint slag drying system in example 3;
FIG. 4 is a schematic diagram of a paint slag drying system in example 4;
the device comprises a 1-stirring device, a 2-drying chamber I, a 3-drying chamber II, a 4-drying chamber III, a 5-storage device, a 6-regenerator, a 7-air compressor, an 8-cooling chamber, a 9-vortex tube, a 10-mixing chamber, an 11-evaporator, a 12-compressor, a 13-condenser, a 14-throttle valve, a 15-fan pump, a 16-first flow valve, a 17-second flow valve, a 18-third flow valve, a 19-fourth flow valve and a 20-gas-liquid separator.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions;
it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a paint slag drying method, as shown in fig. 1, which is a schematic diagram in the embodiment.
A paint slag drying method comprises the following steps:
step 1: stirring the paint slag to be dried and the heat storage particles, and introducing high-temperature gas in the stirring process to preheat the paint slag to be dried to obtain a soup-base-shaped paint slag mixture;
step 2: and (5) drying the paint slag mixture for a plurality of times.
In the embodiment, in order to improve the heat absorption efficiency of the paint slag and accelerate the drying speed of the paint slag, the heat storage particles and the paint slag are stirred into a paint slag mixture, and the added heat storage particles can store external heat and serve as a heat source to raise the temperature inside the paint slag, so that the moisture in the paint slag is easier to evaporate; in addition, in the stirring process, the paint slag mixture is preheated by utilizing high-temperature gas, so that the drying effect and efficiency of paint slag are improved.
Example 2
This example proposes a paint slag drying method which is based on the improvement of the paint slag drying method in example 1, and refines the drying process and the separation process of the paint slag mixture. As shown in fig. 2, a schematic diagram in this embodiment is shown.
The paint slag drying method is characterized by comprising the following steps of:
step 1: stirring the paint slag to be dried and the magnetic heat storage particles, and introducing high-temperature gas in the stirring process to preheat the paint slag to obtain a soup-base-shaped paint slag mixture;
step 2: rolling the paint slag mixture into a sheet, and drying the paint slag mixture for a plurality of times by utilizing high-temperature drying gas under a negative pressure state;
step 3: and (3) preparing the dried paint slag mixture into powder, stirring the powder paint slag mixture, separating magnetic heat storage particles in the powder paint slag mixture through a magnet or an electromagnet, and storing the separated powder dry paint slag. In this embodiment, there are many technical means for making the paint slag mixture into powder, including but not limited to a scraper, a pulverizer and a grinder, and the embodiment is not limited herein.
In the embodiment, the contact area between the paint slag and the high-temperature drying gas is increased by rolling the paint slag mixture into the sheet, so that the drying speed and the drying effect of the paint slag are increased; the paint slag mixture is scraped into powder after being dried, and the magnetic heat storage particles in the paint slag mixture are adsorbed by a magnet or an electromagnet so as to realize the recycling of the magnetic heat storage particles.
Example 3
The embodiment provides a paint slag drying system, as shown in fig. 3, which is a schematic diagram of the paint slag drying system in the embodiment.
A paint slag drying system comprising:
the stirring device 1 is used for stirring paint slag to be dried and heat storage particles, and preheating the paint slag to obtain a paint slag mixture; the stirring device 1 in this embodiment stirs the lump paint slag and the heat storage particles into a paint slag mixture in the form of a soup base by using a stirring paddle, and then conveys the paint slag mixture to a drying device through a conveying pipe. In practical use, the stirring device 1 should not be limited to a stirring paddle, but should also include a paddle stirrer, a turbine stirrer, a propeller stirrer, a frame stirrer, a ribbon stirrer, and a planetary stirrer. In the embodiment, the high-temperature tail gas of the drying device is transmitted to the stirring device through the vacuum pump, and the paint slag mixture is preheated; the air outlet end of the stirring device is connected with the input end of the heat regulating system.
The drying device is used for drying the paint slag mixture for a plurality of times by utilizing high-temperature drying gas under a negative pressure state; the drying device in this embodiment is provided with a conveyor belt for conveying the paint slag mixture, and the high-temperature drying gas is supplied to an air outlet in the drying chamber through a heat regulating system, and the air outlet is arranged above the starting position of the conveyor belt. In this embodiment, the high-temperature drying gas is blown to the paint slag mixture on the conveyor belt through the air outlet, so that the drying device always maintains a higher temperature, the moisture in the paint slag mixture on the conveyor belt is evaporated, and finally the paint slag mixture is conveyed to the storage device 5 through the conveying pipe.
And the storage device 5 is used for storing the dried paint slag mixture.
Further, in the stirring device, the heat storage particles can be replaced by magnetic heat storage particles to be stirred with paint slag to be dried; the storage chamber 5 is provided with a scraper, the paint slag mixture is scraped into powder by the scraper, then the magnetic heat storage particles are separated by a magnet or an electromagnet, and finally the separation of the paint slag and the magnetic heat storage particles is realized, so that the magnetic heat storage particles can be recycled.
The embodiment is also provided with a heat regulating system for supplying high-temperature drying gas to the drying device through the ventilation pipe; there are many techniques or devices capable of generating high temperature drying gas, and the present embodiment is not limited herein.
Example 4
The embodiment provides a paint slag drying system, which is improved based on the paint slag drying system in the embodiment 3, and mainly introduces a heat regulating system capable of recycling high-temperature drying gas. Fig. 4 is a schematic diagram of a paint slag drying system in the present embodiment; to avoid overcomplicating the schematic, some of the components are not labeled in the schematic.
In this embodiment, in order to improve the utilization rate of the high-temperature drying gas in the paint slag drying system, the drying device is set to be a drying chamber one 2, a drying chamber two 3 and a drying chamber three 4 which are sequentially communicated, the output end of the heat regulating system is respectively communicated with the air inlet ends of the drying chamber one 2, the drying chamber two 3 and the drying chamber three 4, and the temperature of the high-temperature drying gas introduced into the drying chamber one 2, the drying chamber two 3 and the drying chamber three 4 is gradually improved; a conveying pipe for conveying paint slag mixture is arranged between the drying chamber I2 and the drying chamber II 3 and between the drying chamber II 3 and the drying chamber III 4. Meanwhile, considering that the moisture in the paint slag mixture is more difficult to evaporate with the decrease of the moisture content, the present embodiment gradually increases the lengths of the conveyor belts in the first drying chamber 2, the second drying chamber 3 and the third drying chamber 4 so that the paint slag mixture having a low moisture content has enough time to evaporate the moisture. In addition, in order to improve the heat absorption efficiency of the paint slag mixture, the paint slag mixture transferred to the drying chamber one 2 is crushed into flakes by using rollers in the present embodiment.
Further, the heat regulating system in the present embodiment includes a regenerator 6, an air compressor 7, a cooling chamber 8, a vortex tube 9, a heat pump system, and a mixing chamber 10. Because the water vapor content in the gas discharged from the stirring device 1 and the drying chamber I2 is high, the gas needs to be dried firstly and then the temperature is raised, and finally the recycling is realized. In order to facilitate the liquefaction of the water vapor in the gas exhausted from the stirring device 1 and the drying chamber one 2, the heat regenerator 6 is adopted in the embodiment to exchange heat between the gas exhausted from the stirring device 1 and the drying chamber one 2 and the drying gas exhausted from the cooling chamber 8, so that the temperature of the gas exhausted from the stirring device 1 and the drying chamber one 2 is reduced and transmitted to the air compressor 7, and the temperature of the drying gas exhausted from the cooling chamber 8 is increased and transmitted to the input end of the vortex tube 9. In order to further reduce the difficulty of liquefying vapor, in this embodiment, the air compressor 7 is used to compress the gas cooled by the regenerator 6, and finally the compressed gas is introduced into the cooling chamber 8, and the compressed gas is mixed with the low-temperature dry gas flowing out from the cold end of the vortex tube 9 in the cooling chamber 8, so that the vapor in the gas is liquefied when encountering cold, and the dry gas is obtained and introduced into the regenerator 6 for heating. Next, in this embodiment, the vortex tube 9 is used to separate the drying gas heated by the regenerator 6 into a high-temperature drying gas and a low-temperature drying gas; the high-temperature drying gas flows to the first drying chamber 2, the second drying chamber 3 and an evaporator 11 in the heat pump system through the hot end of the vortex tube 9, and the low-temperature drying gas flows to the cooling chamber 8 through the cold end of the vortex tube 9. In addition, in order to further remove the moisture in the paint slag mixture and reduce the temperature of the dried paint slag, in this embodiment, the low-temperature drying gas flowing out of the cold end of the vortex tube 9 flows through the gas-liquid separator 20 and then is introduced into the storage device 5.
In the present embodiment, the heat pump system employed includes an evaporator 11, a compressor 12, a condenser 13, and a throttle valve 14; the evaporator 11 is provided with a refrigerant, the refrigerant exchanges heat with high-temperature dry gas entering the heat pump system and then evaporates into high-temperature refrigerant gas, and then flows into the compressor 12 for pressurization, and the high-temperature dry gas exchanges heat and then flows into the mixing chamber 10; the condenser 13 in this embodiment is configured to exchange heat between the high-temperature refrigerant gas and the mixed gas discharged from the mixing chamber 10, so that the high-temperature refrigerant gas is cooled to form a liquid refrigerant, and then flows to the throttle valve 14, and the mixed gas after being raised in temperature flows to the drying chamber two 3 and the drying chamber three 4 through the fan pump 15; the throttle valve 14 reduces the temperature and pressure of the liquid formed by the refrigerant, and the refrigerant flows to the evaporator 11, thereby realizing the recycling of the refrigerant.
In the present embodiment, the high-temperature dry gas subjected to heat exchange by the heat pump system and the gas discharged from the storage device 5 are mixed and heated in the mixing chamber 10. In addition, an exhaust gas treatment device and a water collecting device are provided in the cooling chamber 8, harmful substances in the gas discharged from the stirring device 1 and the drying chamber 1 are removed by the exhaust gas treatment device, and water formed by liquefying the water vapor is stored by the water collecting device. Meanwhile, the vortex tube 9 can be sleeved with a layer of sound insulation material to prevent noise pollution.
In order to reduce the boiling point of water and further improve the drying effect of the paint slag mixture, the first drying chamber 2, the second drying chamber 3 and the third drying chamber 4 in the embodiment are all provided with vacuum pumps for extracting tail gas, so that the first drying chamber 2, the second drying chamber 3 and the third drying chamber 4 are in a vacuum negative pressure environment with the pressure of 10 kPa. In this environment, the boiling point of water is reduced to below 45 ℃. Compared with the method of improving the drying effect of paint slag at high temperature, the method of reducing the pressure can prevent the paint slag from generating harmful gas in a high-temperature environment. In the embodiment, the vacuum pump transmits the gas discharged from the second drying chamber 3 and the third drying chamber 4 to the stirring device 1, and the waste heat of the gas is fully utilized to raise the temperature of the paint slag mixture in the stirring device 1, so that the drying efficiency of the paint slag mixture is higher; while the gas exiting the drying chamber one 2 is still transferred to the regenerator 6. In practical application, the air can be respectively transmitted to the stirring device 1 or the heat regenerator 6 according to the temperature of the air exhausted from the first drying chamber 2, the second drying chamber 3 and the third drying chamber 4.
In another embodiment, the vacuum pump delivers the gases exhausted from drying chamber one 2, drying chamber two 3, and drying chamber three 4 to regenerator 6.
In order to control the progress of the paint slag drying process, in this embodiment, the stirring device 1 and the drying chamber one 2, the drying chamber one 2 and the drying chamber two 3, the drying chamber two 3 and the drying chamber three 4, and the conveying pipes between the drying chamber three 4 and the storage device 5 are all provided with electric valves; the high-temperature drying gas input ends of the first drying chamber 2, the second drying chamber 3 and the third drying chamber 4 are respectively provided with a flow valve.
In the specific implementation process, the stirring device 1 is filled with massive paint slag and fine magnetic heat storage particles with a certain volume fraction, and the paint slag and the magnetic particles are uniformly mixed through stirring of a stirring paddle.
The vacuum pump pumps the air in the first drying chamber 2, the second drying chamber 3 and the third drying chamber 4 to make the pressure of the air be 10kPa, and the vortex tube 9 separates the air in the first drying chamber into high-temperature gas at about 60 ℃ and low-temperature gas at about 0 to-10 ℃.
At this time, the preheated air at about 45 ℃ is introduced into the stirring device 1, and the preheated air in the stirring device 1 flows through the regenerator 6, the air compressor 7 and the cooling chamber 8 in sequence, and then returns to the regenerator 6.
The gas extracted from the stirring device 1 is mixed with the low-temperature gas discharged from the vortex tube 9 in the cooling chamber 8, and then the mixture is subjected to heat recovery by the heat recovery device 6, and the temperature of the gas is reduced to about 35 ℃. The gas then flows to the input end of the vortex tube 9 and is separated into a high temperature gas of about 60 ℃ and a low temperature gas of about 0 to-10 ℃; wherein, the low-temperature gas flows to the cooling chamber 8 through the cold end of the vortex tube 9, and part of the low-temperature gas flows to the storage device 5 after flowing through the gas-liquid separator 20; the high-temperature gas flows to the first drying chamber 2, the second drying chamber 3 and the evaporator 11 in the heat pump system through the hot end of the vortex tube 9.
For the high-temperature gas flowing to the evaporator 11 in the heat pump system, the refrigerant in the evaporator 11 exchanges heat with the high-temperature gas and then evaporates into the high-temperature refrigerant gas, and then flows into the compressor 12 for pressurization, and the high-temperature gas exchanges heat and then flows into the mixing chamber 10. The high-temperature gas subjected to heat exchange by the evaporator 11 is mixed and heated with the gas discharged from the storage device 5 in the mixing chamber 10 to obtain a mixed gas. Finally, the mixed gas flowing out of the mixing chamber 10 is further heated by the condenser 13 and then flows into the second drying chamber 3 and the third drying chamber 4, and at this time, the mixed gas flowing into the second drying chamber 3 and the third drying chamber 4 is about 80 ℃.
Because only the high-temperature gas at the hot end of the vortex tube 9 enters the first drying chamber 2, the temperature in the first drying chamber 2 is slightly lower than 55 ℃; the high-temperature gas at the hot end of the vortex tube 9 and the mixed gas heated by the condenser 13 are mixed and flow into the second drying chamber 3, so that the temperature in the second drying chamber 3 is about 65 ℃; since only the mixed gas heated by the condenser 13 flows into the third drying chamber 4, the temperature in the third drying chamber 4 is slightly lower than 80 ℃.
After about thirty seconds of the preheated air at about 45 ℃ was introduced into the stirring apparatus 1, the paint slag and the magnetic heat storage particles were put into the stirring apparatus 1 and uniformly stirred by the stirring paddle into a soup-like paint slag mixture. Generally, the moisture content of the paint slag mixture at this time is about 60%, and the viscosity of the paint slag mixture is greater than that of the paint slag. Since the gases from the second and third drying chambers 3 and 4 are introduced into the stirring device 1, the temperature of the paint slag mixture is about 45 ℃.
When the paint slag mixture is transferred to the first drying chamber 2 through the transfer pipe and then drops on the conveyor belt, the roller rolls the paint slag mixture into a sheet shape, and free water on the surface of the paint slag mixture is rapidly evaporated due to the pressure of 10kPa in the first drying chamber 2, and the water content of the paint slag mixture is about 50%.
Subsequently, the paint slag mixture is transferred to a second drying chamber 3 along with the conveyor belt, and the temperature of the second drying chamber 3 is about 65 ℃, so that the moisture on the surface layer of the paint slag mixture is dried, and at this time, the moisture content of the paint slag mixture is about 40%.
Then, the paint slag mixture is conveyed to the third drying chamber 4 along with the conveyor belt, bound water exists in the paint slag mixture, and the bound water in the paint slag mixture is promoted to evaporate through the high temperature of 80 ℃ in the third drying chamber 4 and the length of the conveyor belt in the third drying chamber 4, so that the water content of the paint slag mixture is lower than 20%.
Finally, the paint slag mixture is conveyed to a storage device 5 through a material pipe, and the storage device 5 is provided with a scraper for stirring the paint slag mixture, so that the paint slag mixture is in a powder state; when the stirring rod is used for stirring paint slag mixture, the magnet or electromagnet arranged in the storage device 5 adsorbs out magnetic heat storage particles, the low-temperature gas flowing out of the cold end of the vortex tube 9 reduces the temperature of paint slag to further remove water from the paint slag, and the water content of the paint slag is lower than 15%.
Example 5
This embodiment provides a control method of a paint slag drying system, which is applied to the paint slag drying system in embodiment 4.
A control method of a paint slag drying system comprises the following steps:
controlling the stirring device 1, the drying device and the heat regulating system to work; wherein the heat regulating system provides high temperature drying gas to the drying device and the stirring device 1; the stirring device 1 stirs paint slag to be dried and heat storage particles, and preheats the paint slag and the heat storage particles to obtain a paint slag mixture, and the paint slag mixture is transmitted to the drying device through a conveying pipe; the drying device performs drying treatment on the paint slag mixture for a plurality of times by utilizing high-temperature drying gas, and then the paint slag mixture is transmitted to the storage device for storage through the conveying pipe.
Further, the power of the vacuum pump may be controlled so that the internal pressure of the drying device is 10kPa; the conveying speed of the conveyor belt is controlled according to the discharging speed of the stirring device 1, so that the paint slag mixture on the conveyor belt has enough time to dry.
The same or similar reference numerals correspond to the same or similar components;
the terms describing the positional relationship in the drawings are merely illustrative, and are not to be construed as limiting the present patent;
it is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (5)

1. A paint slag drying system, comprising:
the stirring device (1) is used for stirring the paint slag to be dried and the heat storage particles, and preheating the paint slag to be dried to obtain a soup-shaped paint slag mixture; the heat storage particles are magnetic heat storage particles;
the drying device is used for drying the paint slag mixture for a plurality of times by utilizing high-temperature drying gas;
a storage device (5) for storing the dried paint slag mixture;
a heat regulating system for supplying a high-temperature drying gas to the drying device and the stirring device (1);
wherein, a conveying pipe for conveying paint slag mixture is arranged between the stirring device (1) and the drying device and between the drying device and the storage device (5); the soup-like paint slag mixture obtained in the stirring device (1) is conveyed into the drying device through a conveying pipe; the dried paint slag mixture obtained in the drying device is conveyed into the storage device (5) through a conveying pipe; the output end of the heat regulating system is connected with the air inlet end of the drying device, and the air outlet end of the stirring device (1) is connected with the input end of the heat regulating system; the tail gas discharged by the drying device is transmitted to the stirring device (1);
the drying device comprises a first drying chamber (2), a second drying chamber (3) and a third drying chamber (4), wherein conveying belts are arranged in the first drying chamber (2), the second drying chamber (3) and the third drying chamber (4) and sequentially convey paint slag mixtures from the first drying chamber (2) to the second drying chamber (3) and the third drying chamber (4) for drying; the output end of the heat regulating system is respectively communicated with the air inlet ends of the drying chamber I (2), the drying chamber II (3) and the drying chamber III (4), and the temperature of high-temperature drying gas in the drying chamber I (2), the drying chamber II (3) and the drying chamber III (4) is gradually increased; the lengths of the conveyor belts arranged in the drying chamber I (2), the drying chamber II (3) and the drying chamber III (4) are increased;
after the soup-like paint slag mixture output from the stirring device (1) enters the first drying chamber (2), rolling the paint slag mixture into thin slices in the first drying chamber (2) by adopting rollers, sequentially conveying the thin slices of paint slag mixture from the first drying chamber (2) to the second drying chamber (3) and the third drying chamber (4) through the conveyor belt, and drying by utilizing high-temperature drying gas with gradually increased temperature output by the heat regulating system;
the heat regulating system comprises a heat regenerator (6), an air compressor (7), a cooling chamber (8), a vortex tube (9), a heat pump system and a mixing chamber (10); wherein:
the heat regenerator (6) is provided with a first input end, a first output end, a second input end and a second output end; the gas exhausted by the stirring device (1) and the drying chamber I (2) enters the heat regenerator (6) from the first input end of the heat regenerator (6) for heat exchange, flows out from the first output end of the heat regenerator (6) and is transmitted to the air compressor (7); the dry gas exhausted by the cooling chamber (8) enters the heat regenerator (6) from the second input end of the heat regenerator (6) for heat exchange, flows out from the second output end of the heat regenerator (6) and is transmitted to the input end of the vortex tube (9);
the air compressor (7) is used for pressurizing and compressing the gas cooled by the heat regenerator (6) and then transmitting the gas to the cooling chamber (8);
the vortex tube (9) is used for separating the drying gas heated by the heat regenerator (6) into high-temperature drying gas and low-temperature drying gas; the high-temperature drying gas flows to the drying chamber I (2), the drying chamber II (3) and the heat pump system through the hot end of the vortex tube (9), and the low-temperature drying gas flows to the cooling chamber (8) through the cold end of the vortex tube (9);
the cooling chamber (8) is used for mixing the gas pressurized by the air compressor (7) with low-temperature dry gas flowing out of the cold end of the vortex tube (9) so that gaseous water in the gas is liquefied when meeting cold, and dry gas is obtained and transmitted to the heat regenerator (6);
the heat pump system is used for exchanging heat between the high-temperature drying gas flowing into the heat pump system and the mixed gas discharged from the mixing chamber (10) to reduce the temperature of the high-temperature drying gas and increase the temperature of the mixed gas; the high-temperature drying gas after cooling flows to the mixing chamber (10), and the mixed gas after heating flows to the first drying chamber (2) and the second drying chamber (3);
the mixing chamber (10) is used for mixing and heating the high-temperature dry gas subjected to heat exchange of the heat pump system and the gas discharged by the storage device (5).
2. The paint slag drying system as set forth in claim 1 wherein: the heat pump system comprises an evaporator (11), a compressor (12), a condenser (13) and a throttle valve (14); wherein,
the evaporator (11) is internally provided with a refrigerant, the refrigerant exchanges heat with high-temperature dry gas entering the heat pump system, so that the refrigerant is heated and evaporated into high-temperature refrigerant gas, and then flows into the compressor (12) for pressurization, and the high-temperature dry gas is cooled and then flows into the mixing chamber (10);
the condenser (13) is used for exchanging heat between the high-temperature refrigerating gas discharged by the evaporator (11) and the mixed gas discharged by the mixing chamber (10), so that the high-temperature refrigerating gas is cooled to be a liquid refrigerant and then flows to the throttle valve (14), and the mixed gas flows to the drying chamber II (3) and the drying chamber III (4) after the temperature of the mixed gas is raised;
the throttle valve (14) reduces the temperature and pressure of the liquid formed by the refrigerant, and the refrigerant flows to the evaporator (11).
3. The paint slag drying system as set forth in claim 1 wherein: the low-temperature drying gas flowing out of the cold end of the vortex tube (9) is also introduced into the storage device (5).
4. The paint slag drying system as set forth in claim 1 wherein: the drying chamber I (2), the drying chamber II (3) and the drying chamber III (4) are respectively provided with a vacuum pump used for maintaining a negative pressure state, and tail gases in the drying chamber I (2), the drying chamber II (3) and the drying chamber III (4) are respectively transmitted to the stirring device (1) or the heat regenerator (6) through the vacuum pumps.
5. A control method of a paint slag drying system, applied to the paint slag drying system of any one of claims 1 to 4, comprising the steps of:
controlling the stirring device (1), the drying device and the heat regulating system to work; wherein the heat regulating system provides high-temperature drying gas to the drying device and the stirring device (1); the stirring device (1) is used for stirring paint slag to be dried and heat storage particles, preheating the paint slag and the heat storage particles to obtain a paint slag mixture, and transmitting the paint slag mixture to the drying device through a conveying pipe; the drying device performs drying treatment on the paint slag mixture for a plurality of times by utilizing high-temperature drying gas, and then the paint slag mixture is transmitted to the storage device for storage through the conveying pipe.
CN202210785314.1A 2022-07-05 2022-07-05 Paint slag drying method, paint slag drying system and control method of paint slag drying system Active CN115164511B (en)

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