A multi-heat source mode vacuum disc drying system

Abstract

The utility model relates to a kind of vacuum disc drying system of multi-heat source mode, including steam generator, hot water tank, vacuum disc drying equipment and for the liquid heat source pipeline and gaseous heat source pipeline of vacuum disc drying equipment heat supply;Steam inlet pipeline of liquid heat source pipeline is connected from steam generator to hot water tank, steam flowmeter and hot water tank steam inlet regulating valve are sequentially provided on it;Water inlet pipeline of liquid heat source pipeline is connected from hot water tank to vacuum disc drying equipment, and hot water pump is provided on it;Water outlet pipeline of liquid heat source pipeline is connected from vacuum disc drying equipment to hot water tank, and drying equipment hot water outlet valve is provided on it;Steam inlet pipeline of gaseous heat source pipeline is connected from steam generator to vacuum disc drying equipment, steam flowmeter and drying equipment steam inlet valve are sequentially provided on it;Water outlet pipeline of gaseous heat source pipeline is connected from vacuum disc drying equipment to drain water outlet pipeline, including the third branch and the fourth branch in parallel.

Description

Technical Field

[0001] This utility model relates to a vacuum disc drying system with multiple heat sources, belonging to the field of material vacuum drying technology. Background Technology

[0002] In current industrial production and environmental protection, material drying is a crucial step. Taking sludge treatment as an example, with the acceleration of urbanization and the continuous expansion of industrial production, the amount of sludge generated has increased dramatically. Sludge contains a large amount of water, and if it is not effectively dried and directly disposed of, it will not only occupy a large amount of land resources for landfill, but also easily cause environmental pollution.

[0003] Among numerous drying technologies, vacuum disc drying technology has attracted widespread attention due to its unique advantages. However, existing vacuum disc drying systems still suffer from the following problems: 1. Currently, conventional disc drying systems only support a single heat source input, such as steam or hot water. This makes it difficult to fully utilize diverse heat sources, such as thermal oil, flue gas, and industrial waste heat, greatly limiting the diversity and efficiency of energy utilization. 2. There is a lack of experimental comparisons between vacuum disc drying technology and conventional disc drying technology, making it impossible to accurately quantify the advantages of vacuum disc drying technology and calculate the efficiency improvement of vacuum drying compared to conventional drying. 3. During operation, the heat source fluctuates due to various factors, such as unstable energy supply and changes in ambient temperature. However, existing drying systems lack effective adaptive adjustment mechanisms, making it difficult to quickly adjust system parameters.

[0004] In summary, there is an urgent need for a vacuum disc drying system that can provide multiple heat sources and flexibly adjust the heat supply according to the experimental needs at different stages. Utility Model Content

[0005] In order to solve the above-mentioned problems existing in the prior art, this utility model provides a vacuum disc drying system with multiple heat source modes.

[0006] The technical solution of this utility model is as follows: a vacuum disc drying system with multiple heat sources includes a steam generator, a hot water tank, a vacuum disc drying device, and a liquid heat source pipeline and a gaseous heat source pipeline connected in parallel for heating the vacuum disc drying device; the liquid heat source pipeline includes a steam inlet pipeline, a water inlet pipeline, and a water outlet pipeline, and the gaseous heat source includes a steam inlet pipeline and a water outlet pipeline.

[0007] In a preferred embodiment of this utility model, the steam inlet pipe of the liquid heat source pipeline is connected from the steam generator to the hot water tank, and a steam flow meter and a steam inlet regulating valve of the hot water tank are installed thereon; the water inlet pipe of the liquid heat source pipeline is connected from the hot water tank to the vacuum disc drying device, and a hot water pump is installed thereon.

[0008] The inlet pipe of the liquid heat source pipeline includes a shell hot water inlet branch and a central axis hot water inlet branch connected in parallel.

[0009] The hot water inlet branch of the shell is connected from the steam flow meter to the shell below the vacuum disc drying equipment. The hot water tank steam inlet regulating valve, hot water tank, hot water pump front and rear valve groups, hot water pump, hot water flow meter, drying equipment hot water inlet valve, shell hot water inlet valve and shell hot water flow meter are connected in sequence.

[0010] The central axis hot water inlet branch is connected from the steam flow meter to the left central axis of the vacuum disc drying equipment. The hot water tank steam inlet regulating valve, hot water tank, hot water pump front and rear valve groups, hot water pump, hot water flow meter, drying equipment hot water inlet valve, central axis hot water inlet valve, central axis hot water flow meter, central axis steam inlet valve and central axis steam flow meter are connected in sequence.

[0011] The outlet pipe of the liquid heat source pipeline connects to the hot water tank from the vacuum disc drying equipment, and a hot water outlet valve for the drying equipment is installed on it. The outlet pipe of the liquid heat source pipeline includes a central axis pipe on the right side of the vacuum disc drying equipment and a shell pipe on the right side of the vacuum disc drying equipment, which are connected in parallel from the vacuum disc drying equipment to the hot water outlet valve of the drying equipment. A hot water outlet valve for the shell is installed on the shell pipe on the right side of the vacuum disc drying equipment.

[0012] In a preferred embodiment of this utility model, the steam inlet pipe of the gaseous heat source pipeline is connected from the steam generator to the vacuum disc drying device, and a steam flow meter and a steam inlet valve of the drying device are sequentially installed on it.

[0013] The outlet pipe of the gaseous heat source pipeline is connected from the vacuum disc drying equipment to the condensate outlet pipe, including a third branch and a fourth branch connected in parallel; the third branch is connected from the bottom of the vacuum disc drying equipment shell to the condensate outlet pipe, and a shell condensate outlet valve is installed on it; the fourth branch is connected from the central axis pipe on the right side of the vacuum disc drying equipment to the condensate outlet pipe, and a central axis condensate outlet valve is installed on it.

[0014] In a preferred embodiment of this utility model, an expansion tank is provided above the hot water tank; the expansion tank is connected to a water supply pipe with a water supply valve on the left side and an overflow pipe on the right side.

[0015] In a preferred embodiment of this utility model, the steam inlet pipe of the gaseous heat source pipeline is connected from the steam inlet valve of the drying equipment to the vacuum disc drying equipment as a second branch; the second branch includes a shell steam inlet branch and a central shaft steam inlet branch connected in parallel.

[0016] The steam inlet branch of the shell is connected to the left shell of the vacuum disc drying equipment in sequence through the steam inlet valve and the steam flow meter of the shell.

[0017] The central steam inlet branch is connected to the left central axis of the vacuum disc drying equipment via a central steam inlet valve and a central steam flow meter. The central steam inlet valve and the central steam flow meter are connected to the central axis in sequence.

[0018] In a preferred embodiment of this utility model, the material pipeline of the vacuum disc drying system includes an inlet pipeline and an outlet pipeline.

[0019] The feed pipeline is connected to the vacuum disc drying equipment in sequence through a wet material bin, a wet material conveying device, and a feed hopper;

[0020] The discharge pipeline is connected in sequence to the discharge hopper, the dry material conveying device, and the dry material silo.

[0021] In a preferred embodiment of this utility model, the exhaust gas pipeline of the vacuum disc drying system is sequentially connected to a bag filter, a condensate drain, a vacuum pump unit, and an exhaust gas fan.

[0022] In a preferred embodiment of the present invention, the vacuum pump unit is provided with a front air valve on the left side and a rear air valve on the right side, and a bypass valve on the parallel branch is provided.

[0023] In a preferred embodiment of the present invention, the bag filter in the compressed air jet pipeline of the vacuum disc drying system is connected to the air storage tank and the air compressor through a first pulse jet solenoid valve and a second pulse jet solenoid valve, respectively.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] 1. This utility model is a multi-heat source mode vacuum disc drying system. This system introduces a multi-heat source mode, which can integrate various heat source forms, such as steam, hot flue gas, hot water, and heat transfer oil. Different heat sources can be flexibly combined or used individually according to experimental needs, which greatly improves heat utilization efficiency. At the same time, it takes into account both the bottom-in and top-out method of liquid heat exchange medium and the top-in and bottom-out method of gaseous heat exchange medium. The liquid heat exchange medium enters from the bottom of the drying equipment and can fully contact the heat transfer surface, ensuring that it fills the entire central shaft and shell of the drying equipment, which can improve heat transfer efficiency and facilitate the removal of air bubbles generated during heating, preventing air resistance from affecting heat exchange. The gaseous heat exchange medium is evenly distributed in the drying equipment by its own gravity, which is conducive to full contact with the drying equipment. When a phase change occurs, it is also easy for condensate to be discharged, which can also reduce flow resistance and reduce energy consumption.

[0026] 2. This utility model is a vacuum disc drying system with multiple heat sources. By automatically controlling multiple heat sources, it ensures that the temperature of the material environment remains stable throughout the experiment, avoids uneven drying of materials due to heat source fluctuations, and reduces experimental errors. Attached Figure Description

[0027] Figure 1 This is a structural diagram of the multi-heat-source mode vacuum disc drying system of this utility model;

[0028] Figure 2 This is a structural diagram of the vacuum disc drying system for the liquid heat source pipeline of this utility model;

[0029] Figure 3 This is a structural diagram of the vacuum disc drying system for the gaseous heat source pipeline of this utility model;

[0030] Figure 4 This is a structural diagram of a conventional disc drying system for the liquid heat source pipeline of this utility model;

[0031] Figure 5 This is a structural diagram of a conventional disc drying system for a gaseous heat source pipeline according to this utility model.

[0032] The reference numerals in the figure are as follows:

[0033] 1. Steam generator; 2. Hot water tank; 3. Expansion tank; 4. Hot water pump; 5. Vacuum disc drying equipment; 6. Bag filter; 7. Condensate drain; 8. Vacuum pump set; 9. Exhaust fan; 10. Air storage tank; 11. Air compressor; 12. Wet material silo; 13. Wet material conveying device; 14. Feed hopper; 15. Discharge hopper; 16. Dry material conveying device; 17. Dry material silo; 101. Steam flow meter; 102. Shell steam flow meter; 103. Central shaft steam flow meter; 104. Hot water flow meter; 105. Shell hot water flow meter; 106. Central shaft hot water flow meter; 107. Circulating water flow meter; 108. Condensate wastewater flow meter; 201. Steam inlet valve for drying equipment; 202. Shell steam inlet valve ; 203, Central shaft steam inlet valve; 204, Hot water tank steam inlet valve; 205, Expansion tank water supply valve; 206, Drying equipment hot water inlet valve; 207, Shell hot water inlet valve; 208, Central shaft hot water inlet valve; 209, Shell hot water outlet valve; 210, Drying equipment hot water outlet valve; 211, Shell drain outlet valve; 212, Central shaft drain outlet valve; 213, Shell drain valve assembly; 214, Central shaft drain valve assembly; 215, Hot water pump front and rear valve assemblies; 301, Balancing valve; 302, Connecting valve; 303, Drain valve; 304, Vacuum pump assembly front air valve; 305, Vacuum pump assembly rear air valve; 306, Vacuum pump assembly bypass valve; 307, First pulse jet solenoid valve; 308, Second pulse jet solenoid valve. 1. Detailed Implementation Method

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figure 1 This utility model provides a vacuum disc drying system with multiple heat source modes, including a steam generator 1, a hot water tank 2, a vacuum disc drying device 5, and a liquid heat source pipeline and a gaseous heat source pipeline connected in parallel for heating the vacuum disc drying device 5; the liquid heat source pipeline includes a steam inlet pipeline, a water inlet pipeline and a water outlet pipeline, and the gaseous heat source includes a steam inlet pipeline and a water outlet pipeline;

[0036] Please see Figure 2 The steam inlet pipe of the liquid heat source pipeline is connected from the steam generator 1 to the hot water tank 2, and a steam flow meter 101 and a hot water tank steam inlet regulating valve 204 are installed on it in sequence; the water inlet pipe of the liquid heat source pipeline is connected from the hot water tank 2 to the vacuum disc drying device 5, and a hot water pump 4 is installed on it.

[0037] The inlet pipe of the liquid heat source pipeline includes a shell hot water inlet branch and a central axis hot water inlet branch connected in parallel.

[0038] The hot water inlet branch of the shell is connected from the steam flow meter 101 to the lower shell of the vacuum disc drying device 5. The hot water tank steam inlet regulating valve 204, the hot water tank 2 hot water pump front and rear valve group 215, the hot water pump 4, the hot water flow meter 104, the drying device hot water inlet valve 206, the shell hot water inlet valve 207 and the shell hot water flow meter 105 are connected in sequence on it.

[0039] The central axis hot water inlet branch is connected from the steam flow meter 101 to the left central axis of the vacuum disc drying device 5, and is sequentially connected to the hot water tank steam inlet regulating valve 204, hot water tank 2, hot water pump front and rear valve group 215, hot water pump 4, hot water flow meter 104, drying device hot water inlet valve 206, central axis hot water inlet valve 208, central axis hot water flow meter 106, central axis steam inlet valve 203 and central axis steam flow meter 103;

[0040] The outlet pipe of the liquid heat source pipeline connects to the hot water tank 2 from the vacuum disc drying device 5, and is equipped with a hot water outlet valve 210. The outlet pipe of the liquid heat source pipeline includes a central pipe on the right side of the vacuum disc drying device 5 connected in parallel to the hot water outlet valve 210 and a shell pipe on the right side of the vacuum disc drying device 5. A hot water outlet valve 209 is provided on the shell pipe on the right side of the vacuum disc drying device 5. The liquid heat source after the vacuum disc drying device 5 has completed heating flows back to the hot water tank 2 for recycling.

[0041] Please see Figure 3 The steam inlet pipe of the gaseous heat source pipeline is connected from the steam generator 1 to the vacuum disc drying device 5, and a steam flow meter 101 and a steam inlet valve 201 of the drying device are installed on it in sequence.

[0042] The outlet pipe of the gaseous heat source pipeline is connected from the vacuum disc drying device 5 to the condensate outlet pipe, including a third branch and a fourth branch connected in parallel; the third branch is connected from the bottom of the shell of the vacuum disc drying device 5 to the condensate outlet pipe, and a shell condensate outlet valve 211 is installed on it; the fourth branch is connected from the central axis pipe on the right side of the vacuum disc drying device 5 to the condensate outlet pipe, and a central axis condensate outlet valve 212 is installed on it; the condensate outlet pipe is used to discharge the condensate generated by the gaseous heat source after the vacuum disc drying device 5 has completed heating for recycling;

[0043] An expansion tank 3 is provided above the hot water tank 2; the expansion tank 3 is connected to a water supply pipe with a water supply valve 205 on the left side and an overflow pipe on the right side; the hot water tank 2 is equipped with a temperature and pressure sensor for detecting the temperature of the hot water inside the hot water tank 2; the temperature sensor on the hot water tank 2 feeds back the temperature signal of the hot water tank 2 to the steam inlet regulating valve 204 of the hot water tank, and controls the steam flow through the steam inlet regulating valve 204 of the hot water tank.

[0044] The steam inlet pipe of the gaseous heat source pipeline is connected from the steam inlet valve 201 of the drying equipment to the vacuum disc drying equipment 5 as a second branch; the second branch includes a shell steam inlet branch and a central shaft steam inlet branch connected in parallel.

[0045] The steam inlet branch of the shell is connected to the left shell of the vacuum disc drying device 5 in sequence through the shell steam inlet valve 202 and the shell steam flow meter 102;

[0046] The central axis steam inlet branch is connected to the left central axis of the vacuum disc drying equipment 5 via the central axis steam inlet valve 203 and the central axis steam flow meter 103 in sequence. The central axis steam inlet valve 203 and the central axis steam flow meter 103 are connected to it in sequence.

[0047] The material pipeline of the vacuum disc drying system includes an inlet pipeline and an outlet pipeline;

[0048] The feed pipeline connects sequentially to the vacuum disc drying equipment 5 via a wet material silo 12, a wet material conveying device 13, and a feed hopper 14. A rotary valve is installed between the feed hopper 14 and the vacuum disc drying equipment 5 to control the continuous feeding of wet materials and ensure a good vacuum level in the vacuum disc drying equipment 5. In this embodiment, the wet material conveying device 13 can be selected according to the material properties, such as a screw pump or a scraper conveyor.

[0049] The discharge pipeline is connected in sequence to the discharge hopper 15, the dry material conveying device 16, and the dry material bin 17; the discharge hopper 15 is equipped with discharge valves at the top and bottom, and continuous discharge under vacuum is achieved by switching the discharge valves in turn;

[0050] The exhaust gas pipeline and compressed air injection pipeline of the vacuum disc drying system are located above the housing of the vacuum disc drying device 5.

[0051] The exhaust gas pipeline is sequentially connected to the bag filter 6, the condensate drain 7, the vacuum pump group 8, and the exhaust gas fan 9. The vacuum pump group 8 is provided with a vacuum pump group front air valve 304 on the left side and a vacuum pump group rear air valve 305 on the right side, and a vacuum pump group bypass valve 306 on its parallel branch.

[0052] The two bag filters 6 in the compressed air jet pipeline are connected to the air storage tank 10 and the air compressor 11 respectively through the first pulse jet solenoid valve 307 and the second pulse jet solenoid valve 308; the compressed air generated by the air compressor 11 is stored in the air storage tank 10 and used for cleaning and blowing the filter bags.

[0053] Temperature and pressure sensors are installed on both the compressed air injection pipeline and the exhaust gas pipeline for intelligent monitoring of the temperature and pressure at the inlet and outlet of each device.

[0054] The condensate drainer 7 adopts a straight-tube vertical heat exchanger, with a circulating water return pipe and a circulating water inlet pipe equipped with a circulating water flow meter 107 on its right side, and a water storage tank connected below.

[0055] The water storage tank is equipped with a pressure balancing valve 301 above it, a connecting valve 302 on the right side for connecting the condensate drainer 7 to the water storage tank, and a circulating cooling water pipeline with a drain valve 303 and a condensate wastewater flow meter 108 for monitoring the temperature and flow rate of the circulating water connected below. The water storage tank is also equipped with a liquid level gauge for observing the amount of exhaust gas condensate wastewater generated.

[0056] This utility model provides two heat source modes: liquid heat source mode and gaseous heat source mode.

[0057] The liquid heat source mode uses hot water at 70-90℃, and the specific working steps are as follows:

[0058] S1. Keep all pipeline valves in the vacuum disc drying system closed, and start the steam generator 1; when the steam pressure of the steam generator 1 rises to 0.2-0.3 MPa and the temperature reaches 120-130℃, open the hot water tank steam inlet regulating valve 204; at this time, steam is input into the hot water tank 2 through the main steam pipeline and the hot water tank steam inlet pipeline to heat the water in the hot water tank 2;

[0059] At the same time, open the hot water inlet valve 206 of the drying equipment, the hot water inlet valve 207 of the shell, the hot water inlet valve 208 of the central shaft, the steam inlet valve 203 of the central shaft, the hot water outlet valve 209 of the shell, the hot water outlet valve 210 of the drying equipment, and the valve group 215 before and after the hot water pump;

[0060] S2. Adjust the opening of the steam inlet regulating valve 204 of the hot water tank to control the amount of steam input, and monitor the hot water temperature in real time through the temperature sensor on the hot water tank 2; when the temperature sensor on the hot water tank 2 detects that the temperature of the hot water tank 2 rises to 50-60℃, start the hot water pump 4 to draw out hot water.

[0061] S3. Hot water flows through the central axis hot water inlet branch and the shell hot water inlet branch, and flows into the vacuum disc drying equipment 5 to preheat the vacuum disc drying equipment 5.

[0062] The gaseous heat source mode uses saturated steam at 110–160°C, and the specific working steps are as follows:

[0063] T1. Keep all pipeline valves in the vacuum disc drying system closed and start the steam generator 1. When the saturated steam temperature generated by the steam generator 1 rises to the preset 110-160℃, open the steam inlet valve 201 of the drying equipment. At this time, the saturated steam is divided into the shell steam inlet branch and the central shaft steam inlet branch through the steam inlet pipeline of the drying equipment and input into the vacuum disc drying equipment 5 for preheating.

[0064] The preheating process of the vacuum disc drying equipment is the same as that in S4 to S6.

[0065] At the same time, the shell steam inlet valve 202, the central shaft steam inlet valve 203, the shell drain outlet valve 209, the central shaft drain outlet valve 212, the shell drain valve group 213, and the central shaft drain valve group 214 are opened.

[0066] T2. The condensate generated by the saturated steam after heat exchange is discharged from the outlet pipe of the drying equipment and recycled after being drained by the condensate valve group.

[0067] When the vacuum disc drying system detects a decrease or fluctuation in the steam heat source pressure, it calculates the increase in steam flow and sends a command to the steam generator to increase the number of electric heating rods and increase steam production in order to maintain a stable steam pressure output required for the experiment.

[0068] The vacuum disc drying system also adjusts the operating parameters of each device in the system in real time according to the fluctuation of the heat source. For example, when a liquid heat source is used and the hot water temperature decreases due to the fluctuation of the heat source, the frequency of the hot water pump will be appropriately increased to ensure the drying effect and accelerate the circulation speed of the hot water in the vacuum disc drying equipment, so as to enhance the heat transfer efficiency.

[0069] In this embodiment, sludge is dried, and the drying performance of liquid heat source and gaseous heat source under two drying modes is set. The two drying modes include vacuum drying mode and conventional drying mode. The two drying modes are switched by vacuum pump group 8. Vacuum pump group 8 is turned on to perform vacuum operation, so that the inside of the conventional drying equipment reaches a negative pressure state, and the conventional drying mode is converted into vacuum drying mode. Vacuum pump group 8 is turned off, and the vacuum drying mode is converted back into conventional drying mode.

[0070] In vacuum drying mode, after the vacuum disc drying equipment 5 has finished preheating, the heat source temperature is gradually increased; when the temperature of the vacuum disc drying equipment 5 is detected to reach the range of 50-60℃, the front air valve 304 and the rear air valve 305 of the vacuum pump group are opened, and the exhaust fan 9, the vacuum pump group 8 and the connecting valve 302 are started, so that the negative pressure inside the vacuum disc drying equipment is maintained at about -0.09MPa; the balance valve 301 and the drain valve 303 are kept closed.

[0071] Wet materials with a moisture content of 70% to 80% are conveyed to a vacuum disc drying device for drying. The steam volume is gradually increased so that the hot water temperature in the hot water tank reaches 70 to 90°C. The drive device of the vacuum disc drying device drives the device to rotate in the same direction, allowing the wet material to fully contact the disc plates and the shell surface, causing the moisture to evaporate. The resulting exhaust gas accumulates at the top of the vacuum disc drying device and is discharged through a vacuum pump unit, achieving the purpose of vacuum drying. The exhaust gas includes water vapor and odor.

[0072] The exhaust gas enters the condenser drain 7 for condensation. The condenser drain 7 reduces the temperature of the exhaust gas to below 40-50°C, forming wastewater which is stored in a water tank. When the liquid level in the water tank reaches 60%-70%, the valve of the condenser drain automatically switches, closing the connecting valve 302 and opening the balancing valve 301 and the drain valve 303, thus discharging the wastewater through the condensate wastewater pipeline. The exhaust gas that cannot be condensed is fed into the exhaust gas fan by the vacuum pump unit for further treatment.

[0073] After heat exchange, the hot water flows out through the hot water outlet pipe of the drying equipment and returns to the hot water tank 2 for recycling.

[0074] In the conventional drying mode, after the conventional disc drying equipment has finished preheating, the temperature of the heat source is gradually increased, including liquid heat source and gaseous heat source; when the temperature of the conventional disc drying equipment is detected to reach the range of 70-80℃, the bypass valve of the vacuum pump group is opened and the exhaust fan 9 is started, the vacuum pump group 8 is kept closed, and the connecting valve 302, the balance valve 301 and the drain valve 303 are kept open.

[0075] Wet materials with a moisture content of 70% to 80% are conveyed to a conventional disc drying device 13 for drying. The drive device of the conventional disc drying device drives the conventional disc drying device to rotate in the same direction, so that the wet material is in full contact with the disc and the shell surface, allowing the moisture to evaporate. The exhaust gas generated will accumulate at the top of the conventional disc drying device and be discharged by the exhaust gas fan 9 to achieve the purpose of vacuum drying. The exhaust gas includes water vapor and odor.

[0076] The exhaust gas enters the condenser drain 7 for condensation. The condenser drain 7 reduces the temperature of the exhaust gas to below 40-50°C and condenses it into wastewater, which is discharged in real time through the condensate wastewater pipeline. The exhaust gas that cannot be condensed is further treated by the exhaust gas fan 9.

[0077] Please see Figure 2 In the vacuum drying mode with liquid heat source, a vacuum disc drying device 5 is set up to preheat to 50-60℃, and sludge with a moisture content of 80% is added to test the drying capacity.

[0078] Please see Figure 4 In the conventional drying mode with liquid heat source, conventional disc drying equipment is set up to preheat to 70-80℃, sludge with a moisture content of 80% is added, and the drying capacity is tested.

[0079] The test results show that the drying effect of the material under the vacuum drying mode of liquid heat source is better than that under the conventional drying mode of liquid heat source.

[0080] In another embodiment, the sludge is dried, and the drying performance of the gaseous heat source mode is set in two drying modes.

[0081] Please see Figure 3 In the vacuum drying mode with gaseous heat source, a vacuum disc drying device 5 is set up to preheat to 50-60°C, and sludge with a moisture content of 80% is added to test the drying capacity.

[0082] Please see Figure 5In the conventional drying mode with a gaseous heat source, a conventional disc drying device was set up to preheat to 70-80°C, and sludge with a moisture content of 80% was added to test the drying capacity.

[0083] The test results show that the drying effect of the material under the vacuum drying mode with a gaseous heat source is better than that under the conventional drying mode with a gaseous heat source.

[0084] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0085] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A vacuum disk drying system with a multi-heat source mode, characterized in that, It includes a steam generator (1), a hot water tank (2), a vacuum disc drying device (5), and a liquid heat source pipeline and a gaseous heat source pipeline connected in parallel to heat the vacuum disc drying device (5); the liquid heat source pipeline includes a steam inlet pipeline, a water inlet pipeline and a water outlet pipeline, and the gaseous heat source includes a steam inlet pipeline and a water outlet pipeline.

2. The multi-heat-source mode vacuum disk drying system according to claim 1, characterized in that, The steam inlet pipe of the liquid heat source pipeline is connected from the steam generator (1) to the hot water tank (2), and a steam flow meter (101) and a hot water tank steam inlet regulating valve (204) are installed on it in sequence; the water inlet pipe of the liquid heat source pipeline is connected from the hot water tank (2) to the vacuum disc drying device (5), and a hot water pump (4) is installed on it. The inlet pipe of the liquid heat source pipeline includes a shell hot water inlet branch and a central axis hot water inlet branch connected in parallel. The hot water inlet branch of the shell is connected from the steam flow meter (101) to the shell below the vacuum disc drying device (5), and is sequentially connected to the hot water tank steam inlet regulating valve (204), hot water tank (2), hot water pump front and rear valve group (215), hot water pump (4), hot water flow meter (104), drying device hot water inlet valve (206), shell hot water inlet valve (207) and shell hot water flow meter (105); The central axis hot water inlet branch is connected from the steam flow meter (101) to the left central axis of the vacuum disc drying equipment (5), and is sequentially connected to the hot water tank steam inlet regulating valve (204), hot water tank (2), hot water pump front and rear valve group (215), hot water pump (4), hot water flow meter (104), drying equipment hot water inlet valve (206), central axis hot water inlet valve (208), central axis hot water flow meter (106), central axis steam inlet valve (203) and central axis steam flow meter (103); The outlet pipe of the liquid heat source pipeline is connected from the vacuum disc drying device (5) to the hot water tank (2), and a hot water outlet valve (210) of the drying device is provided on it. The outlet pipe of the liquid heat source pipeline includes the central axis pipe on the right side of the vacuum disc drying device (5) and the shell pipe on the right side of the vacuum disc drying device (5) connected in parallel from the vacuum disc drying device (5) to the hot water outlet valve (210) of the drying device. A hot water outlet valve (209) of the shell is provided on the shell pipe on the right side of the vacuum disc drying device (5).

3. The multi-heat-source mode vacuum disk drying system according to claim 1, characterized in that, The steam inlet pipe of the gaseous heat source pipeline is connected from the steam generator (1) to the vacuum disc drying device (5), and a steam flow meter (101) and a steam inlet valve (201) of the drying device are installed on it in sequence. The outlet pipe of the gaseous heat source pipeline is connected from the vacuum disc drying device (5) to the condensate outlet pipe, including a third branch and a fourth branch connected in parallel; the third branch is connected from the bottom of the shell of the vacuum disc drying device (5) to the condensate outlet pipe, and a shell condensate outlet valve (211) is provided thereon; the fourth branch is connected from the central axis pipe on the right side of the vacuum disc drying device (5) to the condensate outlet pipe, and a central axis condensate outlet valve (212) is provided thereon.

4. The multi-heat-source mode vacuum disk drying system according to claim 1, characterized in that, An expansion tank (3) is provided above the hot water tank (2); the expansion tank (3) is connected to a water supply pipe with a water supply valve (205) on the left side and to an overflow pipe on the right side.

5. The multi-heat-source mode vacuum disk drying system according to claim 1, characterized in that, The steam inlet pipe of the gaseous heat source pipeline is connected from the steam inlet valve (201) of the drying equipment to the vacuum disc drying equipment (5) as a second branch; the second branch includes a shell steam inlet branch and a central shaft steam inlet branch connected in parallel; The steam inlet branch of the shell is connected from the steam inlet valve (201) of the drying equipment to the left shell of the vacuum disc drying equipment (5), and the shell steam inlet valve (202) and the shell steam flow meter (102) are connected in sequence thereon; The central axis steam inlet branch is connected from the steam inlet valve (201) of the drying equipment to the central axis on the left side of the vacuum disc drying equipment (5), and the central axis steam inlet valve (203) and the central axis steam flow meter (103) are connected in sequence thereon.

6. The multi-heat-source mode vacuum disk drying system according to claim 1, characterized in that, The material pipeline of the vacuum disc drying system includes an inlet pipeline and an outlet pipeline; The feed pipeline is connected to the vacuum disc drying equipment (5) in sequence through the wet material bin (12), the wet material conveying device (13), and the feed hopper (14); The discharge pipeline is connected in sequence to the discharge hopper (15), the dry material conveying device (16), and the dry material bin (17).

7. The multi-heat-source mode vacuum disk drying system according to claim 1, characterized in that, The exhaust gas pipeline of the vacuum disc drying system is connected in sequence to the bag filter (6), the condensate drain (7), the vacuum pump group (8), and the exhaust gas fan (9).

8. A multi-heat-source mode vacuum disk drying system according to claim 7, characterized in that, The vacuum pump group (8) is provided with a front air valve (304) on the left side and a rear air valve (305) on the right side, and a bypass valve (306) on its parallel branch.

9. A multi-heat-source mode vacuum disk drying system according to claim 1, characterized in that, The bag filter (6) in the compressed air jet pipeline of the vacuum disc drying system is connected to the air storage tank (10) and the air compressor (11) through the first pulse jet solenoid valve (307) and the second pulse jet solenoid valve (308), respectively.

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