Deep drying treatment technology for hazardous waste incineration residues

Abstract

The invention discloses a hazardous waste incineration residue deep drying treatment technology which comprises the following steps: step 1, feeding furnace slag in a furnace slag temporary storage hopper into a furnace slag unloading screw, and conveying the furnace slag in the furnace slag unloading screw into a linear drying machine; 2, the slag material is conveyed to a preheated linear drying machine, a heating medium is introduced into an outer jacket and an inner rotor of the linear drying machine, and the heating medium indirectly heats and evaporates free water and interstitial water of the slag; 3, condensing the heated and evaporated water vapor through a condenser, demisting the water vapor through a demister, and discharging the demisted water vapor out of the linear drying system through a tail gas fan; 4, dried solid residues at the bottom of the drying cavity of the linear drying machine are conveyed through a chute and conveyed into a ton bag machine through a conveying spiral device; and step 5, packaging the solid residues by an automatic ton packaging machine. The drying treatment efficiency of the drying system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste drying treatment, and in particular to a technology for deep drying treatment of hazardous waste incineration residues. Background Art

[0002] Currently, the management of hazardous waste incineration residues has become one of the key areas of waste management in China. However, existing drying equipment in the field of residue treatment still suffers from inefficiencies. These problems are mainly manifested in the following aspects: existing drying equipment has a slow drying speed and is complex to operate, making it unable to quickly process large amounts of hazardous waste. Drying equipment also requires frequent maintenance and upkeep, requiring both manpower and material resources, which increases operating costs.

[0003] For example, Chinese patent CN 108981290 A discloses a garden waste drying and processing device. The drying tank introduces materials through the feed port, and then the materials are crushed by the crushing device. After the materials are shredded, they are evenly sunk from both sides through the bulking turbine on the bulking device, and are subjected to multi-layer heating and drying treatment by the drying and heating pipe, and finally discharged through the discharge port. A swing device is provided for driving the bulking device to rotate, and the device automatically swings according to the dispersion of the materials to avoid blockage. The adjustment device is used to drive and control the tension mechanism, which facilitates the adjustment of the tension of the transmission belt inside the crushing device, effectively avoiding the phenomenon of the crushing wheel slipping, improving the waste shredding efficiency, and making the materials more evenly dispersed after passing through the bulking device, thereby improving the drying quality.

[0004] The drying device provided by the above patent has low drying efficiency, requires manual feeding, and releases harmful substances during waste drying that may be inhaled by the human body;

[0005] Therefore, a method is needed to improve the efficiency of hazardous waste drying treatment. Summary of the Invention

[0006] The object of the present invention is to provide a technology for deep drying treatment of hazardous waste incineration residues, so as to solve the technical problem of low drying treatment efficiency of hazardous waste incineration residues proposed in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A technology for deep drying of hazardous waste incineration residues, comprising the following steps:

[0009] Step 1: supply the slag in the slag buffer hopper into the slag discharge screw, and transport the slag in the slag discharge screw into the linear dryer;

[0010] Step 2: The slag material is transported to the preheated linear dryer. A heat medium is introduced into the outer jacket and inner rotor of the linear dryer to indirectly heat and evaporate the free water and interstitial water in the slag.

[0011] Step 3: The water vapor after heating and evaporation is condensed through the condenser, and after being defogged by the demister, it is discharged from the linear drying system through the exhaust fan;

[0012] Step 4: The dried solid residue at the bottom of the drying chamber of the linear dryer is transported through a chute and then transported to the ton package machine through a conveying screw device;

[0013] Step 5: The automatic ton packaging machine packages the solid residue.

[0014] Preferably, in step 3, the waste steam moves in opposite directions to the slag, and the waste steam is discharged through the exhaust gas box and enters the spray condenser for water washing and condensation;

[0015] The linear dryer is used to remove non-condensable gas and water vapor in the residue, the demister is used to remove water vapor, and the non-condensable gas is discharged from the system through the exhaust fan;

[0016] The exhaust gas discharge is 10%-15% of the system water evaporation.

[0017] Preferably, in step 3, the condensed water from the condenser enters the plate heat exchanger through a circulating water pump, and the plate heat exchanger cools the condensed water before supplying it to the condenser;

[0018] In the plate heat exchanger, the hot side fluid enters with an inlet temperature of 50°C and leaves with an outlet temperature of 40°C after heat conduction.

[0019] The cold side fluid enters with an inlet temperature of 30°C, and after heat exchange with the hot side fluid, leaves with an outlet temperature of 40°C.

[0020] Preferably, it also includes a crushing part and a packaging part. The input end of the linear dryer is connected to the crushing part, and the output end of the linear dryer is connected to the packaging part. A first lifting part is provided between the crushing part and the drying chamber, and a second lifting part is provided between the packaging part and the linear dryer. The first lifting part includes a scraper elevator, a wet hopper, and a unloading spiral device. One end of the scraper elevator is connected to the output end of the crushing part, and the other end of the scraper elevator is connected to the feed port of the wet hopper. The discharge port of the wet hopper is connected to the feed port of the unloading spiral device, and the unloading spiral device is connected to the drying chamber.

[0021] Preferably, an inspection track is provided below the linear dryer and the unloading spiral device, and the linear dryer is slidably provided on the surface of the inspection track.

[0022] Preferably, a condenser is also provided on one side of the linear dryer, the inner top surface of the linear dryer is connected to the inner tube of the condenser, the bottom tube of the condenser is connected to the input end of the circulating water pump, the output end tube of the circulating water pump is connected to the input end of the plate heat exchanger, the output end tube of the plate heat exchanger is connected to a spray pipe, and the spray pipe is provided on the inner top surface of the condenser.

[0023] Preferably, the side wall of the condenser is also connected to a demister via a pipe, the demister is connected to an exhaust fan, and the exhaust fan is used to provide negative pressure to the drying system.

[0024] Preferably, the second lifting part includes a discharge screw conveyor, the input end of the discharge screw conveyor is connected to the output end of the linear dryer, and the output end of the discharge screw conveyor is connected to the packaging part.

[0025] Preferably, a hoisting frame is provided on the upper portion of the maintenance track, and the hoisting frame is provided with an electric hoist along the travel direction of the maintenance track.

[0026] Preferably, the heat medium may be saturated steam, and the saturated steam pressure is 1.0 MPaA.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a technology for deep drying of hazardous waste incineration residues, which includes the following steps:

[0029] Step 1: The slag in the slag buffer hopper is fed into the slag discharge screw, and the slag in the slag discharge screw is conveyed to the linear dryer. Step 2: The slag material is conveyed to the preheated linear dryer. A heat medium is introduced into the outer jacket and inner rotor of the linear dryer, which indirectly heats and evaporates the free water and interstitial water in the slag. Step 3: The heated and evaporated water vapor is condensed in a condenser, defogged in a demister, and discharged from the linear drying system through an exhaust fan. Step 4: The dried solid residue at the bottom of the drying chamber of the linear dryer is conveyed through a chute and then transported to a ton package machine via a conveying screw device. Step 5: The automatic ton package machine packages the solid residue.

[0030] The introduction of high-efficiency condensers and demisters can quickly condense and remove the water vapor after slag evaporation, ensuring humidity control during the drying process and avoiding the impact of excessive humidity on work efficiency;

[0031] Enables solid residue to be collected and transported quickly and efficiently, reducing work interruptions and efficiency losses caused by residue handling;

[0032] The energy of the heat medium can be fully utilized. The heat medium is introduced into the outer jacket and inner rotor of the linear dryer, and the heat energy is stably and indirectly exchanged to the wet slag to be dried, thereby quickly and stably evaporating the free and interstitial moisture in the slag.

[0033] The linear dryer is optimized in design so that the slag can be quickly fed into the linear dryer for drying and simultaneously be packaged quickly and fully automatically, thus improving the processing efficiency of the drying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a drying process diagram of the present invention;

[0035] Figure 2 Schematic diagram of the drying system structure of the present invention;

[0036] Figure 3 This is a schematic structural diagram of the linear drying machine of the present invention;

[0037] Figure 4 It is a schematic diagram of the condenser structure of the present invention.

[0038] In the figure: 1. Crushing unit; 2. Scraper elevator; 3. Wet hopper; 4. Unloading screw device; 5. Maintenance track; 6. Linear dryer; 7. Screw conveyor; 8. Packing unit; 9. Condenser; 10. Circulating water pump; 11. Plate heat exchanger; 12. Electric hoist; 13. Demister; 14. Exhaust fan; 15. Spray pipe. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] Example 1

[0043] See also Figure 1-4 A technology for deep drying of hazardous waste incineration residues, comprising the following steps:

[0044] Step 1: supply the slag in the slag buffer hopper into the slag discharge screw, and transport the slag in the slag discharge screw into the linear dryer 6;

[0045] Step 2: The slag material is transported to the preheated linear dryer 6. A heat medium is introduced into the outer jacket and the inner rotor of the linear dryer 6 to indirectly heat and evaporate the free water and interstitial water in the slag.

[0046] Step 3: The water vapor after heating and evaporation is condensed through the condenser 9, and is demisted by the demister 13 and then discharged from the linear drying system through the exhaust fan 14;

[0047] Step 4: The dried solid residue at the bottom of the drying chamber of the linear dryer 6 is transported through a chute and then transported to the ton package machine through a conveying screw device;

[0048] Step 5: The automatic ton packaging machine packages the solid residue.

[0049] In the above embodiment, the incineration residue is crushed, and the crushed residue is fed into the linear dryer 6. The linear dryer 6 provides heat to the outer jacket and the inner rotor, and the free and interstitial moisture of the slag is evaporated efficiently and stably indirectly through the heat medium. The evaporated moisture is condensed by the condenser 99 and the humidity in the linear dryer 6 is reduced in real time by the demister 13. The solid residue is transported to the ton package machine and is quickly packaged by the fully automatic ton package machine. The introduction of the efficient condenser 99 and the demister 13 can quickly condense and remove the water vapor after the slag evaporates, ensuring the drying process. The humidity in the slag is controlled to avoid the influence of excessive humidity on work efficiency; the solid residue can be collected and transported quickly and efficiently, reducing work interruption and efficiency reduction caused by residue processing; the energy of the heat medium can be fully utilized, and the heat medium is introduced into the outer jacket and the inner rotor of the linear dryer 6, and the heat energy is stably indirectly exchanged to the wet slag to be dried, thereby quickly and stably evaporating the free and interstitial moisture in the slag; the linear dryer 6 is optimized in design, so that the slag can be quickly fed into the linear dryer 6 for drying and quickly packaged, thereby improving the processing efficiency of the equipment.

[0050] Example 2

[0051] See also Figure 1-4 In step 3, the waste steam moves in the opposite direction to the slag, and the waste steam is discharged through the exhaust gas box and enters the spray condenser 9 for water washing and condensation;

[0052] The linear dryer 6 is used to remove non-condensable gases and water vapor in the residue, the demister 13 is used to remove water vapor, and the non-condensable gases are discharged from the system through the exhaust fan;

[0053] The exhaust gas discharge is 10%-15% of the system water evaporation.

[0054] In the above embodiment, the waste steam generated during the drying process moves in the opposite direction to the slag inside the dryer, is discharged from the exhaust gas box above the slag feed port, and enters the spray condenser 9. In the spray condenser 9, the waste steam is washed with water, and water is condensed from the steam. A small amount of non-condensable gas (volatile matter in the air and slag) and water vapor pass through the demister 13 and are discharged from the drying system by the exhaust gas fan. The exhaust gas discharged from the drying system is about 10%-15% of the water evaporation amount of the system. The exhaust gas fan puts the entire drying system in a negative pressure state to avoid the overflow of odor and dust.

[0055] Example 3

[0056] See also Figure 1-4 In step 3, the condensed water from the condenser 9 enters the plate heat exchanger 11 through the circulating water pump 10, and the plate heat exchanger 11 cools the condensed water and then supplies it to the condenser 9;

[0057] In the plate heat exchanger 11, the hot side fluid enters with an inlet temperature of 50°C and leaves with an outlet temperature of 40°C after the heat conduction process;

[0058] The cold side fluid enters with an inlet temperature of 30°C, and after heat exchange with the hot side fluid, leaves with an outlet temperature of 40°C.

[0059] In the above embodiment, the water evaporated from the slag needs to be condensed, and the condensation is carried out by spraying. The circulating spray water can use the same circulating cooling system as the dryer. If energy saving requirements are taken into account when the dryer is shut down, an additional small circulating water pump 10 can be provided. The circulating spraying method is to cool the spray water through the plate heat exchanger 11 and then spray it again for recycling, and only a small amount of wastewater is discharged (the same as the amount of evaporated water). The biggest advantage of circulating spraying is that the amount of wastewater discharged is small.

[0060] Example 4

[0061] See also Figure 1-4 , also includes a crushing part 1 and a packaging part 8, the input end of the linear dryer 6 is connected to the crushing part 1, and the output end of the linear dryer 6 is connected to the packaging part 8, a first lifting part is provided between the crushing part 1 and the drying chamber, and a second lifting part is provided between the packaging part 8 and the linear dryer 6, the first lifting part includes a scraper elevator 2, a wet hopper 3, and a unloading spiral device 4, one end of the scraper elevator 2 is connected to the output end of the crushing part 1, and the other end of the scraper elevator 2 is connected to the feed port of the wet hopper 3, the discharge port of the wet hopper 3 is connected to the feed port of the unloading spiral device 4, and the unloading spiral device 4 is connected to the drying chamber.

[0062] In the above embodiment, the input end of the linear dryer 6 is connected to the crushing part 1. After the crushing part 1 crushes the residue, the crushed residue enters the linear dryer 6 through the input end. The first lifting part is used to supply the residue crushed by the crushing part 1 into the linear dryer 6. When the linear dryer 6 finishes drying, the second lifting part supplies the dried residue in the linear dryer 6 into the packaging part 8 for automatic packaging. After the large pieces of materials and other debris are evenly crushed, the slag is sent to the scraper elevator 2. The scraper elevator 2 transports the material to the wet slag buffer hopper, and then transports it to the linear dryer 6 through the unloading screw. Among the wet slag components, the water is free water, the moisture content of the wet slag is about 30%, and the solid components are inorganic matter and passivated metals. Therefore, the material is non-sticky and can be lifted and transported by the scraper elevator 2.

[0063] Example 5

[0064] See also Figure 1-4An inspection track 5 is provided below the linear dryer 6 and the unloading spiral device 4 , and the linear dryer 6 is slidably provided on the surface of the inspection track 5 .

[0065] In the above embodiment, when the linear dryer 6 is under maintenance, the linear dryer 6 is pulled by the electric hoist so that the linear dryer 6 slides on the maintenance track 5, so that the linear dryer 6 can be dragged out of the working area for easy maintenance.

[0066] Example 6

[0067] See also Figure 1-4 A condenser 9 is also provided on one side of the linear dryer 6. The inner top surface of the linear dryer 6 is connected to the inner tube of the condenser 9. The bottom tube of the condenser 9 is connected to the input end of the circulating water pump 10. The output end tube of the circulating water pump 10 is connected to the input end of the plate heat exchanger 11. The output end tube of the plate heat exchanger 11 is connected to the spray pipe 15. The spray pipe 15 is provided on the inner top surface of the condenser 9.

[0068] The side wall of the condenser 9 is also connected to a demister 13, and the demister 13 is connected to an exhaust fan 14, and the exhaust fan 14 is used to provide negative pressure to the drying system.

[0069] In the above embodiment, the waste steam generated moves in the opposite direction to the slag inside the dryer and is discharged from the exhaust gas box above the slag feed port. The waste steam enters the condenser 9. In the condenser 9, the tail of the spray pipe 15 sprays condensed water from top to bottom. The waste steam is washed with water and water is condensed from the steam.

[0070] Example 7

[0071] See also Figure 1-4 The second lifting part includes a unloading screw conveyor 7, the input end of the unloading screw conveyor 7 is connected to the output end of the linear dryer 6, and the output end of the unloading screw conveyor 7 is connected to the packaging part 8.

[0072] In the above embodiment, the scraper conveyor conveys the material to the wet slag buffer hopper, and then conveys the material to the linear dryer 6 through the discharge screw.

[0073] Example 8

[0074] See also Figure 1-4 A hoisting frame is provided on the upper portion of the inspection track 5 , and an electric hoist 12 is provided on the hoisting frame along the traveling direction of the inspection track 5 .

[0075] In the above embodiment, the electric hoist 12 is provided on the hoisting frame, and is used to pull the linear dryer 6 through the electric hoist 12 .

[0076] Example 9

[0077] See also Figure 1-4 The heat medium may optionally include saturated steam, and the saturated steam pressure is 1.0 MPaA.

[0078] In the above embodiment, the heat medium required for the linear drying process is typically 1.0 MPaA saturated steam, although saturated steam of other pressure levels may also be used. If the steam is overheated, it must be cooled. A heat medium, either 10 kg saturated steam or thermal oil, is introduced into the outer jacket and inner rotor of the linear dryer to indirectly heat and evaporate the free water and interstitial water in the slag.

[0079] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A technology for deep drying of hazardous waste incineration residues, characterized in that: The drying process comprises the following steps: Step 1: supply the slag in the slag buffer hopper into the slag discharge screw, and transport the slag in the slag discharge screw into the linear dryer; Step 2: The slag material is transported to the preheated linear dryer. A heat medium is introduced into the outer jacket and inner rotor of the linear dryer to indirectly heat and evaporate the free water and interstitial water in the slag. Step 3: The water vapor after heating and evaporation is condensed through the condenser, and after being defogged by the demister, it is discharged from the linear drying system through the exhaust fan; Step 4: The dried solid residue at the bottom of the drying chamber of the linear dryer is transported through a chute and then transported to the ton package machine through a conveying screw device; Step 5: The automatic ton packaging machine packages the solid residue.

2. The deep drying treatment technology for hazardous waste incineration residues according to claim 1 is characterized by: In step 3, the waste steam moves in the opposite direction to the slag, and the waste steam is discharged through the exhaust gas box and enters the spray condenser for water washing and condensation; The linear dryer is used to remove non-condensable gas and water vapor in the residue, the demister is used to remove water vapor, and the non-condensable gas is discharged from the system through the exhaust fan; The exhaust gas discharge is 10%-15% of the system water evaporation.

3. The deep drying treatment technology for hazardous waste incineration residues according to claim 2 is characterized by: In step 3, the condensed water from the condenser enters the plate heat exchanger through a circulating water pump, and the plate heat exchanger cools the condensed water before supplying it to the condenser; In the plate heat exchanger, the hot side fluid enters with an inlet temperature of 50°C and leaves with an outlet temperature of 40°C after heat conduction. The cold side fluid enters with an inlet temperature of 30°C, and after heat exchange with the hot side fluid, leaves with an outlet temperature of 40°C.

4. The technology for deep drying of hazardous waste incineration residues according to claim 3 is characterized by: The invention also includes a crushing part (1) and a packaging part (8), wherein the input end of the linear dryer (6) is connected to the crushing part (1), and the output end of the linear dryer (6) is connected to the packaging part (8). A first lifting part is provided between the crushing part (1) and the drying chamber, and a second lifting part is provided between the packaging part (8) and the linear dryer (6). The first lifting part includes a scraper elevator (2), a wet hopper (3), and a discharge screw device (4). One end of the scraper elevator (2) is connected to the output end of the crushing part (1), and the other end of the scraper elevator (2) is connected to the feed port of the wet hopper (3). The discharge port of the wet hopper (3) is connected to the feed port of the discharge screw device (4), and the discharge screw device (4) is connected to the drying chamber.

5. The technology for deep drying of hazardous waste incineration residues according to claim 4 is characterized in that: An inspection track (5) is provided below the linear dryer (6) and the unloading spiral device (4), and the linear dryer (6) is slidably provided on the surface of the inspection track (5).

6. The technology for deep drying of hazardous waste incineration residues according to claim 5 is characterized by: A condenser (9) is also provided on one side of the linear dryer (6). The inner top surface of the linear dryer (6) is connected to the inner tube of the condenser (9). The bottom tube of the condenser (9) is connected to the input end of the circulating water pump (10). The output end tube of the circulating water pump (10) is connected to the input end of the plate heat exchanger (11). The output end tube of the plate heat exchanger (11) is connected to a spray pipe (15). The spray pipe (15) is provided on the inner top surface of the condenser (9).

7. The technology for deep drying of hazardous waste incineration residues according to claim 6 is characterized by: The side wall of the condenser (9) is also connected to a demister (13) through a pipe. The demister (13) is connected to an exhaust fan (14). The exhaust fan (14) is used to provide negative pressure to the drying system.

8. The technology for deep drying of hazardous waste incineration residues according to claim 7 is characterized by: The second lifting part comprises a discharge screw conveyor (7), the input end of the discharge screw conveyor (7) is connected to the output end of the linear dryer (6), and the output end of the discharge screw conveyor (7) is connected to the packaging part (8).

9. The technology for deep drying of hazardous waste incineration residues according to claim 8 is characterized by: A hoisting frame is provided on the upper portion of the inspection track (5), and an electric hoist (12) is provided on the hoisting frame along the traveling direction of the inspection track (5).

10. The technology for deep drying of hazardous waste incineration residues according to claim 1 is characterized in that: The heat medium may optionally include saturated steam, and the saturated steam pressure is 1.0 MPaA.

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