Combined device for removing dioxin in incineration tail gas

Abstract

The utility model discloses a combined type device for removing dioxin in incineration tail gas, and belongs to the technical field of dioxin removal. Comprising an incinerator, a waste heat utilization bin, a quick freezing tower, a bag-type dust collector, a first washing tower, a second washing tower, a demister, a flue gas guide plate, an activated carbon box and a chimney, a material inlet is formed in the upper portion of the incinerator, a combustor is arranged in the incinerator, and a discharge outlet is formed in the top of the chimney. According to the utility model, the multi-combination type activated carbon box is additionally arranged in front of the discharge port, and hydrophobic activated carbon with the iodine value of 800 is adopted, so that the adsorption efficiency of the activated carbon is improved, the dioxin is ensured to be discharged up to the standard, and the dioxin is prevented from being generated or regenerated; besides, by synchronously considering the flue gas flow velocity, demisting and uniform distribution of the flue gas, before the flue gas enters the activated carbon box for adsorption, the demister and the guide plate are arranged, the demister can reduce the influence of water vapor on activated carbon, and the flue gas is effectively shunted through the guide plate, so that the flue gas short circuit is prevented, and the activated carbon adsorption efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dioxin removal, and more specifically to a combined dioxin removal device for incineration tail gas. Background Art

[0002] Incineration exhaust gas may contain a variety of pollutants, dioxin being one of them. Dioxin is highly toxic and persistent, and has potential hazards to human health and the ecological environment.

[0003] For the control of dioxin emission concentration, the uniformity of feed is adjusted (i.e., the uniformity of the material composition entering the incinerator is controlled, and the materials with high chlorine content, high calorific value and low calorific value are proportioned to ensure the relative stability of the fuel composition and calorific value entering the furnace), so as to ensure the stability of combustion and the "three Ts" of the incineration process to ensure the complete oxidation and decomposition of related chemical substances;

[0004] In addition to incineration technology control, high-temperature flue gas rapid cooling to control the re-synthesis of dioxins, and the injection of activated carbon for adsorption to ensure the lowest dust concentration at the bag filter outlet are the most important means of controlling dioxin emission concentrations.

[0005] The existing combined dioxin removal device for incineration tail gas usually uses activated carbon adsorption after incineration to reduce the concentration of dioxin emissions. The mechanism of dioxin formation during incineration is very complex and is not fully understood at present. It is possible to generate or regenerate dioxins in different temperature ranges. In addition, after the flue gas passes through the washing process, water vapor will occupy part of the space in the activated carbon pores, thereby affecting the diffusion and transmission of gas in the pores. Compared with gas molecules, water molecules have stronger polarity and hydrophilicity, and are easy to react with the surface of activated carbon to form a water film, which hinders the adsorption of gas molecules. Water molecules also have an affinity for some organic pollutants, which increases the competition between these pollutants and water molecules, reduces their affinity with activated carbon, and causes a decrease in the adsorption efficiency of activated carbon. In view of this, we propose a combined dioxin removal device for incineration tail gas. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] The utility model aims to provide a combined dioxin removal device for incineration tail gas, so as to solve the problems in the above background technology that dioxin may be generated or regenerated and water vapor affects the adsorption efficiency of activated carbon.

[0008] 2. Technical solution

[0009] A combined dioxin removal device for incineration tail gas, comprising an incinerator, a material inlet is arranged above the incinerator, a burner is arranged inside the incinerator, the output end of the incinerator is connected to a waste heat utilization bin, the output end of the waste heat utilization bin is connected to a quick freezing tower, the output end of the quick freezing tower is connected to a dry reaction flue, a lime silo and an activated carbon silo are arranged below the dry reaction flue, the output end of the lime silo is connected to a jet fan 1, the output end of the activated carbon silo is connected to a jet fan 2, and the jet fan An output end and a second output end of the jet fan are connected to the dry reaction flue, the output end of the dry reaction flue is connected to a bag filter, the output end of the bag filter is connected to a fan, the output end of the fan is connected to a washing tower one, the output end of the washing tower one is connected to a washing tower two, the output end of the washing tower two is connected to a demister, the output end of the demister is connected to a flue gas guide plate, the upper part of the flue gas guide plate is connected to an activated carbon box, the output end of the activated carbon box is connected to a chimney, and a discharge port is provided on the top of the chimney.

[0010] Preferably, the incineration temperature of the incinerator is greater than 1100° C. and the residence time is 2 seconds.

[0011] Preferably, a steam-water separator is provided on the top of the waste heat utilization bin, and the temperature is 500°C-1100°C.

[0012] Preferably, the internal temperature of the quick freezing tower is 200°C-500°C, and the residence time is 1 second.

[0013] Preferably, a PTFE coating material is provided inside the bag filter.

[0014] Preferably, the chimney side wall is provided with a sampling point and a ladder.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The utility model increases the activated carbon adsorption efficiency by adding a multi-combination activated carbon box in front of the discharge port and adopts hydrophobic activated carbon with an iodine value of 800, thereby ensuring that dioxins are discharged in compliance with the standards and preventing the generation or regeneration of dioxins. In addition, by simultaneously considering the flue gas flow rate, demisting and flue gas uniformity, a demister and a guide plate are arranged before the flue gas enters the activated carbon box for adsorption, and the demister can reduce the influence of water vapor on the activated carbon. The flue gas can be effectively diverted through the guide plate to prevent flue gas short circuit and improve the activated carbon adsorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2This is a schematic diagram of the structure of the burner and the steam-water separator of the utility model;

[0020] Figure 3 This is a schematic diagram of the dry reaction flue jet adsorption structure of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure of a two-stage washing tower of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the demister, activated carbon box and chimney of the utility model;

[0023] Figure 6 It is a schematic diagram of the process flow of the utility model.

[0024] Explanation of the numbers in the figure: 1. Incinerator; 2. Waste heat utilization bin; 3. Quick freezing tower; 4. Dry reaction flue; 5. Bag filter; 6. Scrubber 1; 7. Scrubber 2; 8. Demister; 9. Flue gas guide plate; 10. Activated carbon box; 11. Chimney; 12. Discharge port; 13. Sampling point; 110. Material inlet; 120. Burner; 210. Steam-water separator; 410. Lime silo; 420. Activated carbon silo; 430. Jet fan 1; 440. Jet fan 2; 610. Fan. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] See also Figure 1-6 ,The utility model provides a technical solution:

[0029] A combined dioxin removal device for incineration tail gas comprises an incinerator 1, a material inlet 110 is welded on the top of the incinerator 1, the material inlet 110 is connected to the incineration zone inside the incinerator 1, a burner 120 is arranged inside the incinerator 1, the burner 120 is ignited to burn the internal material at high temperature, the output end of the incinerator 1 is connected to a waste heat utilization bin 2, the function of the waste heat utilization bin 2 is to cool the high-temperature flue gas, the output end of the waste heat utilization bin 2 is connected to a quick freezing tower 3, the function of the quick freezing tower 3 is to quickly cool the high-temperature flue gas, the output end of the quick freezing tower 3 is connected to a dry reaction flue 4, a lime silo 410 and an activated carbon silo 420 are arranged below the dry reaction flue 4, and the lime silo 4 The output end of the activated carbon silo 420 is connected to a jet fan 1 430, the output end of the activated carbon silo 420 is connected to a jet fan 2 440, the output ends of the jet fan 1 430 and the output ends of the jet fan 2 440 are connected to the dry reaction flue 4, and the output end of the dry reaction flue 4 is connected to a bag filter 5. The lime material flue gas injected is transported to the dry reaction flue 40 by the jet fan 1 43 for adsorption, so as to ensure that the dust concentration at the outlet of the bag filter 5 is the lowest, and the emission concentration of dioxins is controlled. The activated carbon particles transported by the jet fan 2 440 are quickly and evenly mixed with the flue gas, so that submicron and micron-level heavy metals and their compounds, dioxins and other pollutants can be adsorbed, and the dust concentration at the outlet of the bag filter 5 is ensured to be the lowest. In the bag filter 5, the output end of the bag filter 5 is connected to a fan 610, the output end of the fan 610 is connected to a washing tower 1 6, the output end of the washing tower 1 6 is connected to a washing tower 2 7, and the output end of the washing tower 2 7 is connected to a demister 8. Considering that water vapor will occupy part of the space in the pores of the activated carbon, thereby affecting the diffusion and transmission of the gas in the pores, water molecules have stronger polarity and hydrophilicity than gas molecules, and are easy to react with the surface of the activated carbon to form a water film, which hinders the adsorption of gas molecules. Water molecules also have an affinity for some organic pollutants, which increases the competition between these pollutants and water molecules and reduces their affinity with the activated carbon. Combining the above factors Considering that the incineration tail gas is saturated with too much water after multi-stage washing, a demister 8 is set before entering the activated adsorption bed to reduce the impact of water vapor on the activated carbon. The output end of the demister 8 is connected to a flue gas guide plate 9. Before a large amount of flue gas enters the activated carbon box 10, it needs to pass through the flue gas guide plate 9 to effectively divert the flue gas to prevent flue gas short circuit. The upper part of the flue gas guide plate 9 is connected to an activated carbon box 10. The activated carbon box 10 is provided with hydrophobic activated carbon with an iodine value of 800. The output end of the activated carbon box 10 is connected to a chimney 11. The top of the chimney 11 is provided with an exhaust port 12. The hydrophobic activated carbon with an iodine value of 800 is used to improve the adsorption efficiency of the activated carbon and ensure that dioxins are discharged in compliance with the standards.

[0030] Specifically, in order to ensure sufficient stability in incineration, the incineration temperature of the incinerator 1 is greater than 1100° C. and the residence time is 2 seconds.

[0031] Furthermore, in order to reduce the temperature of dioxins, a steam-water separator 210 is provided on the top of the waste heat utilization bin 2, and the temperature is 500°C-1100°C.

[0032] It is worth noting that, in order to control the re-synthesis of dioxins, the internal temperature of the quenching tower 3 is 200° C.-500° C., and the residence time is 1 second.

[0033] It is worth noting that in order to control the dust concentration to the minimum, the bag filter 5 is provided with PTFE film material to ensure that the dust content at the outlet of the filter is less than 20 mg / m 3 , dioxin<0.5ng TEQ / Nm 3 .

[0034] In addition, in order to facilitate sampling and testing of the exhaust smoke, a sampling point 13 and a ladder are provided on the side wall of the chimney 11.

[0035] The circuits, electronic components and modules involved in the present invention are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to the internal structure and method.

[0036] The device or equipment models involved in this article are as follows:

[0037] The model of jet fan 1 430 and jet fan 2 440 is: GY2-18;

[0038] The model of fan 610 is: SIC-310-30-1.

[0039] Working principle: When the device is required to work, the material is poured into the incinerator 1 through the material inlet 110 for high-temperature incineration greater than 1100°C for more than 2 seconds, and the flue gas enters the waste heat utilization bin 2 for cooling, and further enters the quenching tower 3 for rapid cooling at 200°C for less than 1 second, and then enters the bag filter 5 through the dry reaction channel 4. The lime material flue gas injected is transported to the dry reaction flue 40 through the jet fan 43 for adsorption, ensuring that the dust concentration at the outlet of the bag filter 5 is the lowest, controlling the emission concentration of dioxins, and the activated carbon particles transported by the jet fan 440 It is quickly and evenly mixed with the flue gas, so that it can adsorb submicron and micron-level heavy metals and their compounds, dioxins and other pollutants, and remain in the bag filter 5. Further, the dioxin concentration is reduced by washing through the washing tower 1 6 and the washing tower 2 7. The demister 8 further reduces the influence of water vapor on the activated carbon. Before the large-volume flue gas enters the activated carbon box 10, it needs to pass through the flue gas guide plate 9 to effectively divert the flue gas to prevent the flue gas from short-circuiting. After further entering the activated carbon box 10, hydrophobic activated carbon with an iodine value of 800 is used to improve the activated carbon adsorption efficiency and ensure that dioxins are discharged in compliance with the standards.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A combined dioxin removal device for incineration tail gas, characterized in that: The invention comprises an incinerator (1), wherein a material inlet (110) is arranged above the incinerator (1), a burner (120) is arranged inside the incinerator (1), an output end of the incinerator (1) is connected to a waste heat utilization bin (2), an output end of the waste heat utilization bin (2) is connected to a quick freezing tower (3), an output end of the quick freezing tower (3) is connected to a dry reaction flue (4), a lime silo (410) and an activated carbon silo (420) are arranged below the dry reaction flue (4), an output end of the lime silo (410) is connected to a jet fan 1 (430), an output end of the activated carbon silo (420) is connected to a jet fan 2 (440), and an output end of the jet fan 1 (430) and an output end of the activated carbon silo (420) are connected to a jet fan 2 (440). The output end of the jet fan 2 (440) is connected to the dry reaction flue (4), the output end of the dry reaction flue (4) is connected to a bag filter (5), the output end of the bag filter (5) is connected to a fan (610), the output end of the fan (610) is connected to a washing tower 1 (6), the output end of the washing tower 1 (6) is connected to a washing tower 2 (7), the output end of the washing tower 2 (7) is connected to a demister (8), the output end of the demister (8) is connected to a flue gas guide plate (9), the upper part of the flue gas guide plate (9) is connected to an activated carbon box (10), the output end of the activated carbon box (10) is connected to a chimney (11), and the top of the chimney (11) is provided with an exhaust port (12).

2. The combined dioxin removal device for incineration tail gas according to claim 1, characterized in that: The incineration temperature of the incinerator (1) is greater than 1100° C., and the residence time is 2 seconds.

3. The combined dioxin removal device for incineration tail gas according to claim 2, characterized in that: A steam-water separator (210) is arranged on the top of the waste heat utilization bin (2) and has a temperature of 500°C-1100°C.

4. The combined dioxin removal device for incineration tail gas according to claim 3, characterized in that: The internal temperature of the quick freezing tower (3) is 200°C-500°C, and the residence time is 1 second.

5. The combined dioxin removal device for incineration tail gas according to claim 4, characterized in that: The bag filter (5) is provided with PTFE coating material inside.

6. The combined dioxin removal device for incineration tail gas according to claim 5, characterized in that: The side wall of the chimney (11) is provided with a sampling point (13) and a ladder.

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