Waste incineration flue gas treatment system

Abstract

The utility model discloses a waste incineration flue gas treatment system which comprises a bag-type dust collector, a fly ash outlet at the bottom of the bag-type dust collector is sequentially connected with a high-temperature melting device, a mixing and stirring device, a polymerization reaction device and a mineralization reaction device, and the high-temperature melting device is simultaneously connected with a sodium hydroxide powder adding system. The mixing and stirring device is simultaneously connected with a reaction water adding system, the mineralization reaction device is simultaneously connected with a carbon dioxide conveying pipeline, and a channel of the carbon dioxide conveying pipeline is connected with an air outlet of the bag-type dust collector through the carbon dioxide separation device. According to the waste incineration flue gas treatment system disclosed by the utility model, heavy metals in the fly ash are solidified by performing multi-stage treatment on the fly ash, so that the heavy metals are prevented from polluting the environment, meanwhile, the capability of mineralizing and sealing carbon dioxide in the fly ash is improved in the modification process, and the content of carbon dioxide in the finally discharged flue gas is effectively reduced; the comprehensive treatment of waste incineration products is realized, and the environmental protection pressure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage treatment, in particular to a garbage incineration smoke treatment system. Background Art

[0002] In the field of waste treatment, incineration can achieve the overall goals of harmlessness, stabilization, reduction and resource utilization to the greatest extent, and has become the main way for many countries to deal with urban domestic waste. However, in the process of domestic waste incineration, the fine particulate matter collected by the flue gas purification device - waste incineration fly ash contains a large amount of heavy metals, dissolved salts, organic pollutants, etc., and is classified as hazardous waste. It must be treated and meet the exemption requirements before it can enter the domestic waste landfill for landfill treatment. At the same time, a large amount of carbon dioxide will be released during the incineration of waste. With the implementation of my country's "dual carbon" plan, it is urgent to control the emission of carbon dioxide. Utility Model Content

[0003] The utility model aims to provide a garbage incineration smoke treatment system to solve the problems existing in the prior art.

[0004] The purpose of the utility model is achieved as follows: A waste incineration flue gas treatment system, including a bag dust collector, the fly ash outlet at the bottom of the bag dust collector is connected in sequence to a high-temperature melting device, a mixing and stirring device, a polymerization reaction device and a mineralization reaction device, the high-temperature melting device is also connected to a sodium hydroxide powder adding system, the mixing and stirring device is also connected to a reaction water adding system, the mineralization reaction device is also connected to a carbon dioxide delivery pipeline, and the carbon dioxide delivery pipeline channel is connected to the bag dust collector outlet through a carbon dioxide separation device.

[0005] The waste incineration flue gas treatment system of the utility model realizes physical and chemical modification through multi-stage treatment of fly ash, solidifies heavy metals in fly ash, and avoids heavy metal pollution of the environment. At the same time, the modification process improves the ability of fly ash to mineralize and seal carbon dioxide, and utilizes it to treat carbon dioxide in waste incineration flue gas, effectively reducing the carbon dioxide content in the final exhaust gas, realizing comprehensive treatment of waste incineration products, and reducing environmental protection pressure.

[0006] Specifically, the waste incineration flue gas treatment system of the utility model performs alkali activation treatment on fly ash through a high-temperature melting device, so that quartz, mullite and the like in the fly ash that are insoluble in water can be destroyed to release active substances, and under the action of high temperature, silicate products are generated to fix heavy metals. The fly ash after alkali activation treatment is matured by a mixing and stirring device to form a silicate gel, which further destroys Si and Al substances that are insoluble in water, thereby releasing more active silicon substances. Then, the silicate polymerization reaction is completed in the polymerization reaction device to form modified fly ash crystals with a high specific surface area, thereby improving the ability to mineralize and seal carbon dioxide. Finally, the modified fly ash crystals are used in the mineralization reaction device to mineralize the carbon dioxide in the waste incineration flue gas, thereby achieving waste treatment with waste.

[0007] As a further improvement of the utility model, a ceramic multi-tube dust collector is also included, which is connected in series in front of the air inlet of the bag filter. Therefore, the flue gas generated by the incineration of garbage first passes through the ceramic multi-tube dust collector to filter out large particles in the flue gas (no heavy metals and dioxins and other harmful substances are attached, and no need to be treated as hazardous waste), reducing the workload of subsequent fly ash treatment.

[0008] As a further improvement of the utility model, it also includes a desulfurization tower, which is connected in series to the rear side of the bag filter air outlet, and the desulfurization tower air outlet is connected to the chimney to further achieve flue gas purification and protect the environment.

[0009] As a further improvement of the utility model, the working temperature of the high-temperature melting device is 800°~850°, the reaction water temperature is 100°, the working temperature of the polymerization reaction device is 100°, and the working temperature of the mineralization reaction device is 300° to ensure the reaction effect.

[0010] As a further improvement of the present utility model, the discharge port of the mineralization reaction device is connected to the slag storage bin, and the collected slag can be used as building material, thus realizing resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of a waste incineration flue gas treatment system of the present utility model.

[0012] Among them, 1 is a waste incinerator, 2 is a ceramic multi-tube dust collector, 3 is a bag dust collector, 4 is a desulfurization tower, 5 is a chimney, 6 is a high-temperature melting device, 7 is a mixing and stirring device, 8 is a polymerization reaction device, 9 is a mineralization reaction device, 10 is a slag storage bin, 11 is a sodium hydroxide powder dosing system, 12 is a reaction water dosing system, and 13 is a carbon dioxide separation device. DETAILED DESCRIPTION

[0013] like Figure 1The waste incineration flue gas treatment system shown includes a waste incinerator 1, a ceramic multi-tube dust collector 2, a bag filter 3, a desulfurization tower 4 and a chimney 5 in sequence along the flow direction of the flue gas. The fly ash outlet at the bottom of the bag filter 3 is connected to a high-temperature melting device 6, a mixing and stirring device 7, a polymerization reaction device 8, a mineralization reaction device 9 and a slag storage bin 10 in sequence. The high-temperature melting device 6 is also connected to a sodium hydroxide powder addition system 11, the mixing and stirring device 7 is also connected to a reaction water addition system 12, and the mineralization reaction device 9 is also connected to a carbon dioxide delivery pipeline, and the carbon dioxide delivery pipeline channel is connected to the air outlet of the bag filter 3 through a carbon dioxide separation device 13. The flue gas separated by the carbon dioxide separation device 13 is connected to the desulfurization tower through a pipeline for further purification.

[0014] The working temperature of the high temperature melting device 6 is 800°~850°, the temperature of the reaction water is 100°, the working temperature of the polymerization reaction device 8 is 100°, and the working temperature of the mineralization reaction device is 300° to ensure the reaction effect.

[0015] The waste incineration flue gas treatment system of this embodiment first filters out large particles in the flue gas (no heavy metals and dioxins and other harmful substances are attached, and no need to be treated as hazardous waste) through a ceramic multi-tube dust collector 2, reducing the workload of subsequent fly ash treatment. Then, the fly ash is subjected to alkali activation treatment by a high-temperature melting device 6, so that the quartz, mullite and other insoluble in water in the fly ash can be destroyed and the active substances are released, and silicate products are generated under the action of high temperature to fix the heavy metals. Then, the fly ash after the alkali activation treatment is matured by a mixing and stirring device 7 to form a silicate gel, further destroying the Si and Al-containing substances that are insoluble in water, thereby releasing more active silicon substances. Then, the silicate polymerization reaction is completed in the polymerization reaction device 8 to form modified fly ash crystals with a high specific surface area, thereby improving the ability of mineralization and sequestration of carbon dioxide. Finally, the modified fly ash crystals are used in the mineralization reaction device 9 to mineralize the carbon dioxide in the waste incineration flue gas, so as to achieve waste treatment with waste. The slag collected in the slag storage bin 10 can be used as a building material to achieve further resource utilization.

[0016] In summary, the waste incineration flue gas treatment system of this embodiment realizes physical and chemical modification through multi-stage treatment of fly ash, solidifies heavy metals in fly ash, and avoids heavy metal pollution of the environment. At the same time, the modification process improves the ability of fly ash to mineralize and seal carbon dioxide, and utilizes it to treat carbon dioxide in waste incineration flue gas, effectively reducing the carbon dioxide content in the final exhaust gas, realizing comprehensive treatment of waste incineration products, and reducing environmental protection pressure.

[0017] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A waste incineration flue gas treatment system, including a bag filter, characterized in that: The fly ash outlet at the bottom of the bag filter is connected in sequence with a high-temperature melting device, a mixing and stirring device, a polymerization reaction device and a mineralization reaction device; the high-temperature melting device is also connected with a sodium hydroxide powder adding system; the mixing and stirring device is also connected with a reaction water adding system; the mineralization reaction device is also connected with a carbon dioxide delivery pipeline; and the carbon dioxide delivery pipeline channel is connected with the air outlet of the bag filter through a carbon dioxide separation device.

2. The waste incineration flue gas treatment system according to claim 1, characterized in that: It also includes a ceramic multi-tube dust collector, which is connected in series on the front side of the air inlet of the bag dust collector.

3. The waste incineration flue gas treatment system according to claim 1, characterized in that: It also includes a desulfurization tower, which is connected in series to the rear side of the bag filter air outlet, and the desulfurization tower air outlet is connected to the chimney.

4. The waste incineration flue gas treatment system according to any one of claims 1 to 3, characterized in that: The discharge port of the mineralization reaction device is connected to the slag storage bin.

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