Hazardous waste incineration device

Abstract

The utility model discloses a hazardous waste incineration device and belongs to the technical field of hazardous waste disposal, high-temperature-resistant bricks and functional materials are arranged in a rotary kiln and a secondary combustion chamber, the situation that due to the fact that the temperature difference in the rotary kiln and the secondary combustion chamber fluctuates too much, refractory materials in a furnace expand and fall off, the safety of equipment is affected, and the service life of the equipment is prolonged can be prevented; the flue gas flow rate monitor can monitor the flue gas flow rate on line, the high-calorific-value waste liquid pipeline can directly discharge coking materials out of the rotary kiln, the coking amount in the equipment in the operation cycle is reduced, the coke cleaning speed is increased, the annual disposal amount of the incineration device is increased, the production cost is reduced, and the equipment can stably operate for 3 months, so that the annual operation time exceeds 300 days; and the decoking efficiency is greatly improved.

Description

Technical Field

[0001] The present application belongs to the technical field of hazardous waste disposal, and in particular relates to a hazardous waste incineration device. Background Art

[0002] There are two main methods for hazardous waste treatment: resource utilization and harmlessness. Harmlessness is mainly based on incineration. At present, the main types of furnaces used for hazardous waste incineration at home and abroad include rotary kiln incinerators, grate furnaces, liquid injection incinerators, fluidized bed incinerators, multi-layer bed incinerators and pyrolysis incinerators. The incineration process of hazardous waste is relatively complicated. Rotary kilns are widely used due to their simple structure, strong adaptability to hazardous waste, stable control, easy operation, mature technology and long operating history.

[0003] The rotary kiln is a widely used incineration equipment in the field of hazardous waste disposal. Solid hazardous waste enters the rotary kiln through special conveying equipment, and liquid hazardous waste is sprayed into the feed end of the kiln through high-efficiency atomization equipment. The waste completes the process of water evaporation, volatile analysis, ignition and combustion in the rotary kiln. The ash is discharged from the bottom of the rear end plate, and the generated flue gas carries unburned waste particles into the secondary combustion chamber. The temperature of the secondary combustion chamber is generally set at 850-1200℃, and the flue gas residence time is more than 2s. The harmful components and undecomposed organic matter in the flue gas are cracked and burned in the secondary combustion chamber.

[0004] In the existing technology, the coke deposits in the rotary kiln incinerator are cleaned by using the "air pick + pick drill" operation method. The cleaning locations are mostly at the kiln tail, the secondary combustion chamber outlet flue, and the boiler return. If this method is to be operated, it must be carried out after the furnace is shut down, which affects the operation cycle time and has high operating costs. In addition, the coke cleaning operation environment is poor, the efficiency is low, and the coke cleaning effect is not ideal. During the high-temperature incineration process of the existing equipment, the temperature difference in the incinerator fluctuates too much, which will cause the refractory materials in the furnace to expand and fall off, affecting the safety of the equipment and shortening the service life of the equipment. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a hazardous waste incineration device to solve the technical problems in the prior art that the cleaning of coke in a rotary kiln incinerator requires the furnace to be shut down, resulting in a long cleaning cycle and low efficiency; and the refractory materials in the incinerator expand and easily fall off.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted in this application is: to provide a hazardous waste incineration device, including a rotary kiln, one side of the rotary kiln is connected to a secondary combustion chamber, high calorific value waste liquid pipelines are respectively provided at both ends of the rotary kiln, a feeding assembly is provided at one end of the rotary kiln, the inner wall of the rotary kiln is provided with high-temperature resistant bricks, a flue gas flow rate monitor is provided in the secondary combustion chamber, and functional materials are provided on the inner wall of the secondary combustion chamber.

[0007] In one embodiment,

[0008] The rotary kiln is cylindrical, with a V-shaped bracket at the bottom. The high-temperature resistant brick material includes chrome corundum castables attached to both ends of the inner wall of the rotary kiln and chrome corundum composite bricks in the middle.

[0009] In one embodiment,

[0010] A pneumatic regulating valve is provided on the V-shaped bracket.

[0011] In one embodiment,

[0012] The connection between the rotary kiln and the secondary combustion chamber is connected by mullite castable.

[0013] In one embodiment,

[0014] The secondary combustion chamber includes an upper part, a middle part and a lower part of the secondary combustion chamber. A trapezoidal exhaust outlet is provided on one side of the lower part of the secondary combustion chamber; a deep closed groove is provided in the middle position of the secondary combustion chamber; and the flue gas flow rate monitor is arranged at the upper part of the secondary combustion chamber.

[0015] In one embodiment,

[0016] The functional materials include insulation boards attached to the inner walls of the upper, middle and lower parts of the secondary combustion chamber; the insulation boards on the upper and lower parts of the secondary combustion chamber are also attached with high-strength, wear-resistant, acid-resistant and corrosion-resistant lightweight castables; the high-strength, wear-resistant, acid-resistant and corrosion-resistant lightweight castables are attached with high-strength, wear-resistant, acid-resistant and corrosion-resistant heavy castables; the insulation board in the middle part of the secondary combustion chamber is also attached with composite bricks.

[0017] In one embodiment,

[0018] A smoke exhaust pipe is provided on one side of the upper portion of the secondary combustion chamber, and the inner wall of the smoke exhaust pipe is provided with high-strength, wear-resistant, acid-resistant, and corrosion-resistant heavy-duty castable material.

[0019] In one embodiment,

[0020] The feeding assembly includes a burner arranged at one end of the rotary kiln away from the secondary combustion chamber. A waste liquid spray gun is provided on one side of the burner, and a negative pressure gauge access port, a spare port and a temperature thermocouple are provided on the other side from top to bottom. An oxygen supplementation air inlet is provided below the burner, and a bulk feeding channel is provided below the oxygen supplementation air inlet. A barrel feeding channel is provided on one side of the bulk feeding channel, and a detection material delivery port is provided on the other side.

[0021] The present application provides a hazardous waste incineration device, which, by arranging high-temperature resistant bricks and functional materials in the rotary kiln and the secondary combustion chamber, can prevent excessive temperature fluctuations in the rotary kiln and the secondary combustion chamber, which will cause the refractory materials in the furnace to expand and fall off, affecting the safety of the equipment and extending the service life of the equipment; the flue gas flow rate monitor can monitor the flue gas flow rate online, and the high calorific value waste liquid pipeline can discharge the coke directly into the rotary kiln, reducing the amount of coke inside the equipment during the operation cycle, increasing the coke cleaning speed, increasing the annual disposal volume of the incineration device, and reducing production costs; by detecting the flue gas flow rate, the waste incineration state and the degree of incineration can be controlled, and the overall temperature can be controlled in real time; this equipment can operate stably for 3 months, thereby achieving an annual operating time of more than 300 days, greatly improving the coke cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a schematic diagram of the structure of a hazardous waste incineration device;

[0024] Figure 2 for Figure 1 mid-G side view;

[0025] Figure 3 This is a schematic diagram of the rotary kiln structure;

[0026] Figure 4 A diagram is shown for mullite castable;

[0027] Figure 5 for Figure 1 Enlarged view of point Ⅰ in the middle;

[0028] Figure 6 for Figure 1 Enlarged view of the middle II;

[0029] Figure 7 For the Figure 1 Cross-sectional views at AA, BB, CC, DD, and EE.

[0030] Explanation of symbols in the figure:

[0031] 1. Rotary kiln; 1-1. Feeding section; 1-2. Combustion section; 1-3. Burnout section; 2. Secondary combustion chamber; 2-1. Upper part of secondary combustion chamber; 2-2. Middle part of secondary combustion chamber; 2-3. Lower part of secondary combustion chamber; 3. Chrome corundum castable; 4. Chrome corundum composite brick; 5. V-shaped bracket; 6. Pneumatic regulating valve; 7. Bulk feeding channel; 8. Material delivery port for testing; 9. Oxygen supply air inlet; 10. Temperature thermocouple; 11. Spare port; 12. Negative pressure gauge access port; 13. Burner; 14. Waste liquid spray gun; 15. Barrel feeding channel; 16. High-strength, wear-resistant, acid-resistant and corrosion-resistant heavy-weight castable; 17. High-strength, wear-resistant, acid-resistant and corrosion-resistant lightweight castable; 18. Insulation board; 19. Mullite castable; 20. Deep closed groove; 21. Trapezoidal discharge port; 22. Composite brick; 23. Smoke exhaust duct. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clear and understandable, this application is further described in detail. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0033] In one embodiment, a hazardous waste incineration device, such as Figure 1 As shown, it includes a rotary kiln 1, one side of which is connected to a secondary combustion chamber 2. Figure 2 As shown, high calorific value waste liquid pipelines are respectively provided at both ends of the rotary kiln 1, and a feed assembly is provided at one end of the rotary kiln 1, such as Figure 3 、 Figure 7 As shown, the inner wall of the rotary kiln 1 is affixed with high temperature resistant bricks, a flue gas velocity monitor is provided in the secondary combustion chamber 2, and the inner wall of the secondary combustion chamber 2 is affixed with functional materials; the high temperature resistant bricks include chrome corundum castables 3 affixed to both ends of the inner wall of the rotary kiln 1 and chrome corundum composite bricks 4 in the middle; Figure 4 As shown, the connection between the rotary kiln 1 and the secondary combustion chamber 2 is connected by mullite castable 19; a smoke exhaust pipe 23 is provided on one side of the upper part 2-1 of the secondary combustion chamber, and the feeding assembly includes a burner 13 arranged at one end of the rotary kiln 1 away from the secondary combustion chamber 2, and a waste liquid spray gun 14 is provided on one side of the burner 13. Multiple waste liquid spray guns 14 can be provided, and there are 4 in this embodiment; a negative pressure gauge access port 12, a spare port 11 and a temperature thermocouple 10 are provided on the other side from top to bottom, an oxygen supplementation air inlet 9 is provided below the burner 13, a bulk feeding channel 7 is provided below the oxygen supplementation air inlet 9, a barrel feeding channel 15 is provided on one side of the bulk feeding channel 7, and a detection material delivery port 8 is provided on the other side.

[0034] Specifically, the rotary kiln 1 is cylindrical, with a V-shaped bracket 5 at the bottom, which is used to support the rotary kiln 1. A pneumatic regulating valve 6 is provided on the V-shaped bracket 5, which is connected to the burner 13 to control the temperature of the secondary combustion chamber 2; the rotary kiln 1 is used for the combustion treatment of hazardous waste. The rotary kiln 1 includes three parts: a feeding section 1-1, a combustion section 1-2 and a burnout section 1-3. The combustion section 1-2 is entirely covered with chrome corundum composite bricks 4, and the feeding section 1-1 and the burnout section 1-3 are covered with chrome corundum castables 3 at both ends. The part close to the combustion section 1-2 is Chrome corundum composite bricks 4 are laid in 54 circles; chrome corundum has high refractoriness, high strength, good thermal shock stability, and strong corrosion resistance. The chrome corundum castable 3 and chrome corundum composite bricks 4 are laid in the rotary kiln 1, and the mullite castable 19 used at the connection between the rotary kiln 1 and the secondary combustion chamber 2 can prevent the material from falling off due to excessive temperature in the rotary kiln 1, thereby extending the service life of the equipment; the bulk feeding channel 7 and the barrel feeding channel 15 are used for feeding, the temperature thermocouple 10 is used for detecting temperature, and the oxygen inlet 9 is used to provide an oxygen source;

[0035] The high calorific value waste liquid pipeline is located at the left end of the feeding section 1-1 and the right end of the burnout section 1-3 respectively. The high calorific value waste liquid pipeline located in the feeding section 1-1 is connected to the waste liquid spray gun 14. The burner 13 provides heating power. The waste liquid spray gun 14 can control the temperature of the rotary kiln 1 through the high calorific value waste liquid; the high calorific value waste liquid pipeline located in the burnout section 1-3 can bake the coked position of the burnout section 1-3 at high temperature, melt the coked material at this position by high temperature, and flow into the slag remover to be discharged in the form of slag, thereby reducing the amount of coking in the burnout section 1-3;

[0036] The secondary combustion chamber 2 includes a secondary combustion chamber upper portion 2-1, a secondary combustion chamber middle portion 2-2 and a secondary combustion chamber lower portion 2-3. A deep closed groove 20 is provided in the middle of the secondary combustion chamber 2. The secondary combustion chamber 2 is used to process the smoke and other substances generated by the rotary kiln 1. Figure 5 As shown, functional materials are attached to the inner wall surrounded by the secondary combustion chamber 2 and the deep closed groove 20, specifically including: insulation boards 18 attached to the inner walls of the upper part 2-1, the middle part 2-2 and the lower part 2-3 of the secondary combustion chamber, the insulation boards 18 of the upper part 2-1 and the lower part 2-3 of the secondary combustion chamber are also attached with high-strength, wear-resistant, acid-resistant and corrosion-resistant lightweight castables 17, and high-strength, wear-resistant, acid-resistant and corrosion-resistant lightweight castables 17 are attached with high-strength, wear-resistant, acid-resistant and corrosion-resistant heavy castables 16; the insulation boards 18 of the middle part 2-2 of the secondary combustion chamber are also attached with composite bricks 22; the insulation boards 18 can better maintain the heating temperature of the secondary combustion chamber 2 and avoid heat loss, such as Figure 6As shown, the inner wall of the smoke exhaust pipe 23 is affixed with a high-strength, wear-resistant, acid-resistant, and corrosion-resistant heavy castable 16, and the high-strength, wear-resistant, acid-resistant, and corrosion-resistant lightweight castable 17 is made of aluminate cement, high-alumina fine material, expanded clay and additives. The high-strength, wear-resistant, acid-resistant, and corrosion-resistant heavy castable 16 is a cement-based composite single-component dry powder mortar, which is made of high-strength cement, mineral admixtures, high-strength aggregate and anti-cracking and wear-resistant agents, and is industrially produced and formulated. The high-strength, wear-resistant, acid-resistant, and corrosion-resistant heavy castable 16 and the high-strength, wear-resistant, acid-resistant, and corrosion-resistant lightweight castable 17 can protect the secondary combustion chamber 2 from being corroded and eroded by various substances, thereby extending the service life of the secondary combustion chamber 2; a trapezoidal exhaust outlet 21 is provided on one side of the lower part 2-3 of the secondary combustion chamber; the trapezoidal exhaust outlet 21 is used to remove residues in the secondary combustion chamber 2 and prevent coking; the flue gas flow rate monitor can be set at any position on the inner wall of the upper part of the secondary combustion chamber to detect the flue gas flow rate of the secondary combustion chamber 2.

[0037] The above describes in detail the specific structure of the hazardous waste incineration device. Figure 1-Figure 7 The process flow of the above-mentioned hazardous waste incineration device is described as follows:

[0038] 1. Temperature control of secondary combustion chamber 2

[0039] When there is sufficient high calorific value hazardous waste material, high calorific value material is used for heating. During high temperature operation, the temperature is set to 1200-1250℃, and the temperature fluctuation range is <100℃. Therefore, the calorific value of the overall material mixture is required to reach more than 4000kcal / kg, and there must be stable high calorific value waste liquid (calorific value more than 5000kcal / kg).

[0040] The spray volume is controlled by the pneumatic regulating valve 6 at the front end of the burner 13, and the temperature of the secondary combustion chamber 2 is further controlled. Since the high-temperature operation is only for the temperature of the secondary combustion chamber 2, there is no special requirement for the temperature of the rotary kiln 1. The high calorific value waste liquid can be sprayed into the burner 13 of the secondary combustion chamber 2 for incineration, which can reduce the consumption of high calorific value materials.

[0041] 2. Flue gas flow rate control

[0042] The flue gas flow rate monitor is used to monitor the flue gas flow rate online to characterize and control the flue gas flow rate of the entire incineration system. By detecting the flue gas flow rate, the waste incineration status and degree of incineration can be controlled, and the overall temperature can be controlled in real time. The flue gas flow rate of our incineration device is controlled at 11-12m / s, and the specific control value can fluctuate according to process requirements. By monitoring the flue gas flow rate, the amount of coke attached to the kiln tail of the rotary kiln 1 and the exhaust pipe 23 can be reduced.

[0043] 3. High calorific value waste liquid coking process

[0044] By utilizing the high calorific value waste liquid pipeline, the coked position at the tail of the kiln is baked at high temperature, and the coked material at this position is melted by high temperature, flows into the slag remover, and comes out in the form of slag.

[0045] The present application provides a hazardous waste incineration device, including a rotary kiln, one side of the rotary kiln is connected to a secondary combustion chamber, one end of the rotary kiln is provided with a feed assembly, the other end is provided with a high calorific value waste liquid pipeline, the inner wall of the rotary kiln is provided with high temperature resistant bricks, the secondary combustion chamber is provided with a flue gas flow rate monitor, and the inner wall of the secondary combustion chamber is provided with functional materials; by arranging high temperature resistant bricks and functional materials in the rotary kiln and the secondary combustion chamber, it can prevent the temperature difference between the rotary kiln and the secondary combustion chamber from fluctuating too much, which will cause the refractory material in the furnace to expand and fall off, affecting the safety of the equipment and extending the service life of the equipment; the high calorific value waste liquid pipeline can discharge the coke directly into the rotary kiln, reducing the operation The amount of coking inside the periodic equipment is increased, the decoking speed is improved, the annual disposal volume of the incineration device is increased, and the production cost is reduced; by detecting the flue gas flow rate, the waste incineration status and degree of incineration can be controlled, and the overall temperature can be controlled in real time; this equipment can operate stably for 3 months, thereby achieving an annual operating time of more than 300 days, which greatly improves the decoking efficiency; based on the hazardous waste incineration process established by this device, high calorific value materials are used for heating first, which greatly saves costs; during normal operation, the temperature of the secondary combustion chamber only needs to be above 1100℃, and this device can increase the temperature, and the temperature range is larger.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A hazardous waste incineration device, comprising a rotary kiln, one side of which is connected to a secondary combustion chamber, characterized in that: Both ends of the rotary kiln are provided with high calorific value waste liquid pipelines, one end of the rotary kiln is provided with a feeding assembly, the inner wall of the rotary kiln is provided with high temperature resistant bricks, the secondary combustion chamber is provided with a flue gas flow rate monitor, and the inner wall of the secondary combustion chamber is provided with functional materials.

2. A hazardous waste incineration device according to claim 1, characterized in that: The rotary kiln is cylindrical, with a V-shaped bracket at the bottom. The high-temperature resistant brick material includes chrome corundum castables attached to both ends of the inner wall of the rotary kiln and chrome corundum composite bricks in the middle.

3. A hazardous waste incineration device according to claim 2, characterized in that: A pneumatic regulating valve is provided on the V-shaped bracket.

4. The hazardous waste incineration device according to claim 1, characterized in that: The connection between the rotary kiln and the secondary combustion chamber is connected by mullite castable.

5. The hazardous waste incineration device according to claim 1, characterized in that: The secondary combustion chamber includes an upper part, a middle part and a lower part of the secondary combustion chamber. A trapezoidal exhaust outlet is provided on one side of the lower part of the secondary combustion chamber; a deep closed groove is provided in the middle position of the secondary combustion chamber; and the flue gas flow rate monitor is arranged at the upper part of the secondary combustion chamber.

6. The hazardous waste incineration device according to claim 5, characterized in that: The functional materials include insulation boards attached to the inner walls of the upper, middle and lower parts of the secondary combustion chamber; the insulation boards on the upper and lower parts of the secondary combustion chamber are also attached with high-strength, wear-resistant, acid-resistant and corrosion-resistant lightweight castables; the high-strength, wear-resistant, acid-resistant and corrosion-resistant lightweight castables are attached with high-strength, wear-resistant, acid-resistant and corrosion-resistant heavy castables; the insulation board in the middle part of the secondary combustion chamber is also attached with composite bricks.

7. The hazardous waste incineration device according to claim 5, characterized in that: A smoke exhaust pipe is provided on one side of the upper portion of the secondary combustion chamber, and the inner wall of the smoke exhaust pipe is provided with high-strength, wear-resistant, acid-resistant, and corrosion-resistant heavy-duty castable material.

8. The hazardous waste incineration device according to claim 1, characterized in that: The feeding assembly includes a burner arranged at one end of the rotary kiln away from the secondary combustion chamber. A waste liquid spray gun is provided on one side of the burner, and a negative pressure gauge access port, a spare port and a temperature thermocouple are provided on the other side from top to bottom. An oxygen supplementation air inlet is provided below the burner, and a bulk feeding channel is provided below the oxygen supplementation air inlet. A barrel feeding channel is provided on one side of the bulk feeding channel, and a detection material delivery port is provided on the other side.

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