CN219342031U

CN219342031U - Device for treating solid waste incineration fly ash by multistage water washing and cement kiln incineration

Info

Publication number: CN219342031U
Application number: CN202320073794.9U
Authority: CN
Inventors: 高源�; 朱昊; 刘汉飞; 季雨凡
Original assignee: China Construction Industrial and Energy Engineering Group Co Ltd
Current assignee: China Construction Industrial and Energy Engineering Group Co Ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-07-14
Anticipated expiration: 2033-01-10

Abstract

The utility model provides a device for treating solid waste incineration fly ash by multistage washing and cement kiln incineration, which comprises a first-stage washing tank, wherein the first-stage washing tank is sequentially connected with first-stage filtering equipment, second-stage washing tank, second-stage filtering equipment, third-stage washing tank and third-stage filtering equipment, a filter residue outlet of the third-stage filtering equipment is connected with cement kiln waste heat drying equipment, and the cement kiln waste heat drying equipment is sequentially connected with mixing stirring equipment and cement kiln calcining equipment; the filtrate outlet of the first-stage filtering equipment is connected with a sedimentation tank, the sedimentation outlet of the sedimentation tank is sequentially connected with the sedimentation filtering equipment, the adjusting tank and the two-stage membrane component, and the filtrate outlet of the sedimentation tank is connected with the water inlet of the first-stage washing tank. The method can greatly improve the removal efficiency of chloride ions in the solid waste incineration fly ash, remove the heavy metal ions and dioxin, and realize harmless, reduction, stabilization and recycling of the solid waste incineration fly ash.

Description

Device for treating solid waste incineration fly ash by multistage water washing and cement kiln incineration

Technical Field

The utility model relates to the technical field of solid waste incineration fly ash treatment, in particular to a device for treating solid waste incineration fly ash by multistage water washing and cement kiln incineration.

Background

Fly ash is a powder material with lighter volume weight and fine particle size, which is collected at a flue gas pipeline, a separator, a dust remover and the like in the solid waste incineration process. The fly ash contains cancerogenic substances such as heavy metal, dioxin and the like, belongs to dangerous wastes specified in the national hazardous waste directory, and can destroy the ecological environment if the hazardous wastes are improperly disposed.

At present, the fly ash is mainly treated by cement solidification or medicament stabilization and landfill and high-temperature stabilization. The landfill needs to occupy a large amount of land resources, and the long-term stability of the landfill has a certain risk; the high-temperature stabilization treatment comprises high-temperature melting, high-temperature sintering and cement kiln co-treatment, and the high-temperature stabilization treatment technology can solidify heavy metals in the fly ash at high temperature, remove harmful substances such as dioxin and the like, and has the resource property of converting other substances in the fly ash into building materials. Compared with the other two high-temperature stabilization treatment modes, the cement kiln co-treatment has the advantages of no need of new sites/equipment, low production cost, low energy consumption and high recycling degree, so that the cement kiln co-treatment becomes a hot spot for fly ash treatment, research, application and management.

The solid waste incineration fly ash in China has high content of soluble chloride, secondary pollution caused by escape of hydrogen chloride gas is difficult to control by fusion sintering, and the fly ash with the chloride ion content of less than 3% is only suitable for co-treatment by directly spraying into a cement kiln, so that the solid waste incineration fly ash in China needs dechlorination pretreatment before high-temperature calcination, and the poor kiln entering speed can cause skinning, equipment and pipelines in the kiln, and meanwhile, the high-chlorine-content material discharged by a bypass ventilation bypass is also a treatment difficulty.

Disclosure of Invention

Aiming at the prior art, the utility model provides a device for treating solid waste incineration fly ash by multistage washing and cement kiln incineration.

The utility model provides a device for treating solid waste incineration fly ash by multistage water washing and cement kiln incineration, which comprises a first-stage water washing tank, wherein an outlet of the first-stage water washing tank is connected with an inlet of first-stage filtering equipment, a filter residue outlet of the first-stage filtering equipment is connected with an inlet of a second-stage water washing tank, an outlet of the second-stage water washing tank is connected with an inlet of a second-stage filtering equipment, a filter residue outlet of the second-stage filtering equipment is connected with an inlet of a third-stage water washing tank, an outlet of the third-stage water washing tank is connected with an inlet of third-stage filtering equipment, a filter residue outlet of the third-stage filtering equipment is connected with cement kiln waste heat drying equipment, and the cement kiln waste heat drying equipment is sequentially connected with mixing stirring equipment and cement kiln calcination equipment;

the filtrate outlet of the first-stage filtering equipment is connected with the inlet of the sedimentation tank, the sedimentation outlet of the sedimentation tank is sequentially connected with the sedimentation filtering equipment, the adjusting tank and the two-stage membrane component, and the filtrate outlet of the sedimentation tank is connected with the water inlet of the first-stage washing tank.

Preferably, the filtrate outlet of the secondary filtering device is connected with the water inlet of the primary water washing tank.

Preferably, the filtrate outlet of the three-stage filtering device is connected with the water inlet of the primary water washing tank.

Compared with the prior art, the utility model has the beneficial effects that: the utility model processes the solid waste incineration fly ash by using a cement kiln after multistage water washing, multistage filtration and waste heat drying, thereby greatly reducing the soluble chloride in the solid waste incineration fly ash, thoroughly decomposing dioxin, breaking the secondary synthesis condition, and fusing heavy metals in cement lattices, avoiding the generation of waste salt in the whole process, solving the problem of difficult disposal of the solid waste incineration fly ash to a certain extent, realizing harmless, reduced, stabilized and resource utilization of the solid waste incineration fly ash, and having the remarkable characteristics of low investment, low cost, low energy consumption, high efficiency, high resource utilization degree and the like.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.

In the figure: 1. a primary water washing tank; 2. a primary filtration device; 3. a second-stage water washing tank; 4. a secondary filtering device; 5. a third-stage water washing tank; 6. a third stage filtration device; 7. waste heat drying equipment of the cement kiln; 8. mixing and stirring equipment; 9. a cement kiln calcination device; 10. a sedimentation tank; 11. a precipitation filtration device; 12. an adjustment tank; 13. a dual stage membrane assembly.

Detailed Description

The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.

Examples

The utility model provides a multistage washing is device of cement kiln incineration disposal solid waste incineration flying ash in coordination with, as shown in fig. 1, including one-level washing jar 1, the export of one-level washing jar 1 is connected with the entry of one-level filtration equipment 2, the filter residue export of one-level filtration equipment 2 is connected with the entry of second grade washing jar 3, the export of second grade washing jar 3 is connected with the entry of second grade filtration equipment 4, the filter residue export of second grade filtration equipment 4 is connected with the entry of tertiary washing jar 5, the export of tertiary washing jar 5 is connected with the entry of tertiary filtration equipment 6, the filter residue export of tertiary filtration equipment 6 is connected with cement kiln waste heat drying equipment 7, cement kiln waste heat drying equipment 7 is connected with mixing stirring equipment 8, cement kiln calcination equipment 9 in proper order.

Further, a filtrate outlet of the primary filtering device 2 is connected with an inlet of the sedimentation tank 10, a sedimentation outlet of the sedimentation tank 10 is connected with the sedimentation filtering device 11, a filtrate outlet of the sedimentation filtering device 11 is sequentially connected with the adjusting tank 12 and the two-stage membrane component 13, and a filtrate outlet of the sedimentation tank 9 is connected with a water inlet of the primary washing tank 1. The filtrate outlet of the secondary filtering device 4 and the filtrate outlet of the tertiary filtering device 6 are connected with the water inlet of the primary water washing tank 1.

In the embodiment, when the method is implemented, fly ash and deionized water are sent into a primary washing tank 1, after primary washing, the primary washing fly ash is sent into a secondary washing tank 3 through a primary filtering device 2, after secondary washing, the secondary washing fly ash is sent into a tertiary washing tank 5 through a secondary filtering device 4, after tertiary washing, the tertiary washing fly ash is sent into a cement kiln waste heat drying device 7 through a tertiary filtering device 6, after drying, the fly ash enters a mixing and stirring device 8, is mixed and stirred with cement raw materials, and finally enters a cement kiln calcination device 9 for calcination, so that cement clinker is obtained. The gradient utilization of flushing water is realized by multistage echelon water washing, and the utilization efficiency of the flushing water is improved, so that the removal rate of soluble chloride salt is improved, and the content of the soluble chloride salt in the solid waste incineration fly ash is greatly reduced.

Meanwhile, the primary filtrate generated by the primary filtering equipment 2 enters a sedimentation tank 10, carbon dioxide separated from cement kiln flue gas is introduced, and generates sediment together with soluble heavy metal ions in the primary filtrate, so that the soluble heavy metal ions in the primary filtrate are effectively removed, and the obtained supernatant enters a primary washing tank 1 for recycling; the filtrate of the sediment in the sedimentation tank 10 after being filtered by the sediment filtering equipment 11 is directly fed into the two-stage membrane component 13 for treatment after passing through the adjusting tank 12, so as to generate industrial acid and alkali, and no impurity salt is generated in the whole process.

In the implementation process of the embodiment, the flushing water is recycled through the primary, secondary and tertiary washing tanks, and the filtrates generated by the secondary filtering equipment 4 and the tertiary filtering equipment 6 are returned to the primary washing tank 1 for recycling, so that the utilization rate of the flushing water can be improved by more than 20%.

When the method is implemented, the waste heat generated in the calcining process of the cement kiln is utilized to dry the solid waste incineration fly ash after three-stage washing and filtering, fossil fuel is not required to be additionally used, and the disposal cost of the solid waste incineration fly ash is saved by more than 30%.

In the embodiment, the dried water-washed fly ash and outsourced cement raw materials are mixed and stirred, and then are sent into a cement kiln for calcination, so that the cost of the outsourced raw materials can be saved by more than 10%.

In the implementation of the embodiment, the mixed and stirred water-washed fly ash, heavy metal carbonate precipitate and outsourced raw materials are sent into a cement kiln for calcination, dioxin is thoroughly decomposed, secondary synthesis conditions are broken down, heavy metals are fixed in cement lattices, and the risk of heavy metal pollution to the environment is eliminated.

In the implementation of the embodiment, the two-stage membrane is adopted to treat the soluble chloride in the filtrate filtered by the precipitation and filtration equipment 11, so that hydrochloric acid, sodium hydroxide and potassium hydroxide are finally generated, and the method is directly used for flue gas treatment of a cement plant, and no waste salt is generated in the whole process.

According to the embodiment, the solid waste incineration fly ash is treated by using the cement kiln after being subjected to multistage water washing, multistage filtration and waste heat drying, so that the soluble chloride in the solid waste incineration fly ash is greatly reduced, dioxin is thoroughly decomposed, the secondary synthesis condition is broken down, heavy metals are fused in cement lattices, no waste salt is generated in the whole process, the problem of difficult disposal of the solid waste incineration fly ash can be solved to a certain extent, and the method has the remarkable characteristics of low investment, low cost, low energy consumption, high efficiency, high recycling degree and the like.

The foregoing is only the embodiments of the present utility model, and therefore, the patent scope of the utility model is not limited thereto, and all equivalent structures made by the description of the utility model and the accompanying drawings are directly or indirectly applied to other related technical fields, which are all within the scope of the utility model.

Claims

1. The device for treating the solid waste incineration fly ash by multistage water washing and cement kiln incineration is characterized by comprising a first-stage water washing tank, wherein an outlet of the first-stage water washing tank is connected with an inlet of first-stage filtering equipment, a filter residue outlet of the first-stage filtering equipment is connected with an inlet of a second-stage water washing tank, an outlet of the second-stage water washing tank is connected with an inlet of a second-stage filtering equipment, a filter residue outlet of the second-stage filtering equipment is connected with an inlet of a third-stage water washing tank, an outlet of the third-stage water washing tank is connected with an inlet of third-stage filtering equipment, a filter residue outlet of the third-stage filtering equipment is connected with cement kiln waste heat drying equipment, and the cement kiln waste heat drying equipment is sequentially connected with mixing stirring equipment and cement kiln calcination equipment;

2. The apparatus for treating solid waste incineration fly ash by multistage water washing in cooperation with cement kiln incineration according to claim 1, wherein a filtrate outlet of the secondary filtering device is connected with a water inlet of the primary water washing tank.

3. The apparatus for treating solid waste incineration fly ash by incineration of a multistage water washing collaborative cement kiln according to claim 1 or 2, wherein a filtrate outlet of the three-stage filtering device is connected with a water inlet of the one-stage water washing tank.