Gravity settling multi-stage fly ash rinsing system capable of reducing energy consumption

Abstract

The utility model discloses a gravity settling multi-stage fly ash rinsing system capable of reducing energy consumption, which relates to the technical field of fly ash rinsing and comprises a first-stage rinsing component, a second-stage rinsing component, a third-stage rinsing component and a filter pressing component. The first-stage rinsing assembly comprises a first-stage washing mixing reactor, a first-stage washing A-stage sedimentation tank and a first-stage washing B-stage sedimentation tank which are communicated in sequence, and the second-stage rinsing assembly comprises a second-stage washing mixing reactor, a second-stage washing A-stage sedimentation tank and a second-stage washing B-stage sedimentation tank which are communicated in sequence; according to the fly ash rinsing system, solid-liquid separation of fly ash slurry is achieved in a gravity settling mode, compared with a traditional centrifugal machine solid-liquid separation mode, energy is not consumed in solid-liquid separation of the rinsing system, when a large amount of fly ash is rinsed, energy is saved, and energy is saved. The energy-saving effect is particularly prominent, and the filtrate is recycled for pulping through backflow, so that the water consumption can be reduced, and the water resource is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of fly ash rinsing, in particular to a gravity sedimentation multi-stage fly ash rinsing system with low energy consumption. Background Technique

[0002] Municipal solid waste incineration fly ash is a powder substance collected in the flue gas purification equipment during the process of municipal solid waste incineration power generation. The fly ash contains soluble salts and components similar to those of cement clinker, such as CaO, SiO 2 , Al 2 O 3 etc. Among them, the main components of the soluble salts are potassium, sodium, chloride ions, etc., which are harmful substances to the cement kiln calcination, accounting for about 30% of the fly ash amount. The insoluble substances mainly consist of calcium, silicon, aluminum, iron, etc., which can become components of cement raw materials, accounting for about 70% of the fly ash amount. According to the characteristic that the fly ash composition is similar to that of cement raw materials, using fly ash to replace part of the cement raw materials can not only effectively treat solid hazardous waste, but also the produced cement properties can meet the standards of international ordinary Portland cement, realizing the comprehensive utilization of resource recovery and saving the mineral resources used for cement production. However, the high content of chlorides in fly ash will have adverse effects on the cement kiln, such as the formation of crust in the tail gas chamber of the kiln and high-temperature chlorine corrosion of the rotary kiln body. Moreover, too high a content of Cl element in cement will cause corrosion of steel bars. The state stipulates that the chlorine content in cement must be less than 0.06%. In order to ensure the stable and sustainable operation of the cement kiln co-disposal of fly ash and truly realize the resource utilization of fly ash, it is necessary to remove a large amount of chloride ions contained in the fly ash. Therefore, how to dechlorinate is the key to the entire fly ash resource utilization process.

[0003] The principle of fly ash rinsing is to dissolve and extract potassium, sodium, and chlorine in the fly ash through rinsing to make secondary by-products of industry. The rinsed fly ash is sent to the cement kiln for high-temperature calcination to solidify and decompose heavy metals and dioxins by using the high temperature of the cement kiln. However, currently, during the process of fly ash rinsing, a centrifuge is needed to separate the solid and liquid, and the energy consumption required for large-scale fly ash rinsing is relatively high, resulting in a high cost of fly ash rinsing. Therefore, a gravity sedimentation multi-stage fly ash rinsing system with low energy consumption is needed to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a gravity sedimentation multi-stage fly ash rinsing system with low energy consumption to solve the problems existing in the prior art as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] Gravity sedimentation low - energy - consumption multi - stage fly ash rinsing system, including a primary rinsing component, a secondary rinsing component, a tertiary rinsing component and a pressure - filtration component. The primary rinsing component includes a primary water - washing mixing reactor, a primary water - washing Class A sedimentation tank and a primary water - washing Class B sedimentation tank that are connected in sequence. The secondary rinsing component includes a secondary water - washing mixing reactor, a secondary water - washing Class A sedimentation tank and a secondary water - washing Class B sedimentation tank that are connected in sequence. Both the primary water - washing Class A sedimentation tank and the primary water - washing Class B sedimentation tank are connected with a delivery pump through pipelines, and the output end of this delivery pump is connected with the secondary water - washing mixing reactor through a pipeline;

[0007] The tertiary rinsing component includes a tertiary water - washing mixing reactor and a tertiary water - washing Class A sedimentation tank that are connected with each other. Both the secondary water - washing Class A sedimentation tank and the secondary water - washing Class B sedimentation tank are connected with a delivery pump through pipelines, and the output end of this delivery pump is connected with the tertiary water - washing mixing reactor through a pipeline;

[0008] The tertiary water - washing Class A sedimentation tank is connected with the pressure - filtration component through a delivery pump, and the filtrate outlet of the pressure - filtration component is connected with the secondary water - washing mixing reactor.

[0009] Preferably, stirring components are provided in each reaction tank of the primary rinsing component, the secondary rinsing component and the tertiary rinsing component. The stirring component includes a driving motor and stirring blades.

[0010] Preferably, automatic regulating weirs are arranged between the primary water - washing Class A sedimentation tank and the primary water - washing Class B sedimentation tank, and automatic regulating weirs are also arranged between the secondary water - washing Class A sedimentation tank and the secondary water - washing Class B sedimentation tank.

[0011] Preferably, the pressure - filtration component includes a first plate - and - frame filter press and a second plate - and - frame filter press.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The present utility model realizes the solid - liquid separation of fly ash slurry by using the gravity sedimentation method. Compared with the traditional centrifuge solid - liquid separation method, this rinsing system does not consume energy for solid - liquid separation. When dealing with a large amount of fly ash rinsing, the energy - saving effect is particularly prominent. Moreover, the recycling of the filtrate for pulping can reduce the water consumption and save water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic connection structure diagram of each component of the present utility model.

[0015] In the figure: 1. Primary water-washing mixing reactor; 2. Primary water-washing Class A sedimentation tank; 3. Primary water-washing Class B sedimentation tank; 4. Secondary water-washing mixing reactor; 5. Secondary water-washing Class A sedimentation tank; 6. Secondary water-washing Class B sedimentation tank; 7. Tertiary water-washing mixing reactor; 8. Tertiary water-washing Class A sedimentation tank; 9. First plate-and-frame filter press; 10. Second plate-and-frame filter press. Detailed implementation manners

[0016] To make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the detailed implementation manners.

[0017] Please refer to Figure 1 , the present utility model provides the following technical solutions:

[0018] A multi-stage fly ash rinsing system with low energy consumption by gravity sedimentation, comprising a primary rinsing assembly, a secondary rinsing assembly, a tertiary rinsing assembly and a filter pressing assembly. The primary rinsing assembly includes a primary water-washing mixing reactor 1, a primary water-washing Class A sedimentation tank 2 and a primary water-washing Class B sedimentation tank 3 that are connected in sequence. The primary water-washing mixing reactor 1 is used for pulping the original fly ash, and the primary water-washing Class A sedimentation tank 2 and the primary water-washing Class B sedimentation tank 3 are used for solid-liquid separation of the slurry.

[0019] The secondary rinsing assembly includes a secondary water-washing mixing reactor 4, a secondary water-washing Class A sedimentation tank 5 and a secondary water-washing Class B sedimentation tank 6 that are connected in sequence. Both the primary water-washing Class A sedimentation tank 2 and the primary water-washing Class B sedimentation tank 3 are connected with a delivery pump through pipelines, and the output end of the delivery pump is connected with the secondary water-washing mixing reactor 4 through a pipeline. The secondary water-washing mixing reactor 4 is used for secondary pulping of fly ash, and the secondary water-washing Class A sedimentation tank 5 and the secondary water-washing Class B sedimentation tank 6 are used for secondary solid-liquid separation.

[0020] An automatic regulating weir plate is arranged between the primary water-washing Class A sedimentation tank 2 and the primary water-washing Class B sedimentation tank 3, and an automatic regulating weir plate is also arranged between the secondary water-washing Class A sedimentation tank 5 and the secondary water-washing Class B sedimentation tank 6. The water flow can be automatically controlled through the setting of the automatic regulating weir plate.

[0021] The tertiary rinsing assembly includes a tertiary water-washing mixing reactor 7 and a tertiary water-washing Class A sedimentation tank 8 that are connected to each other. Both the secondary water-washing Class A sedimentation tank 5 and the secondary water-washing Class B sedimentation tank 6 are connected with a delivery pump through pipelines, and the output end of the delivery pump is connected with the tertiary water-washing mixing reactor 7 through a pipeline. The tertiary water-washing mixing reactor 7 is used for tertiary pulping, and the tertiary water-washing Class A sedimentation tank 8 is used for tertiary solid-liquid separation.

[0022] The third-stage water-washing A-level sedimentation tank 8 is connected to the filter press assembly through a delivery pump. The filtrate outlet of the filter press assembly is communicated with the secondary water-washing mixing reactor 4, and the filtrate can be recycled for pulping again. The filter press assembly includes a first plate-frame filter press 9 and a second plate-frame filter press 10. The arrangement of the two plate-frame filter presses enables the continuous operation of the rinsing system.

[0023] In each reaction tank of the primary rinsing assembly, secondary rinsing assembly, and third-stage rinsing assembly, a stirring assembly is provided. The stirring assembly includes a driving motor and stirring blades. The setting of the stirring assembly can promote the pulping operation of fly ash.

[0024] The working process of the present utility model is as follows:

[0025] Fly ash is added to the primary water-washing mixing reactor 1 and mixed into pulp through the stirring assembly. The prepared slurry flows into the primary water-washing A-level sedimentation tank 2 and the primary water-washing B-level sedimentation tank 3 for gravity sedimentation to separate solid and liquid. The separated liquid enters the water purification system for purification. The fly ash water-washing filter residue is transported to the secondary water-washing mixing reactor 4 for secondary pulping. The slurry enters the secondary water-washing A-level sedimentation tank 5 and the secondary water-washing B-level sedimentation tank 6 for gravity sedimentation to separate solid and liquid. The separated liquid is used for the pre-dissolution of fly ash. The fly ash water-washing filter residue is transported to the third-stage water-washing mixing reactor 7 for tertiary pulping. During this process, water is replenished to the third-stage water-washing mixing reactor 7, and the fly ash is rinsed using the stirring assembly. Then, solid-liquid separation is carried out through the third-stage water-washing A-level sedimentation tank 8. The fly ash filter residue is transported to the first plate-frame filter press 9 and the second plate-frame filter press 10 for filtration. The filtrate flows back to the secondary water-washing mixing reactor 4 for pulping, and the filter residue is sent to the fly ash drying system for drying, thus completing the rinsing treatment of fly ash.

[0026] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. Gravity sedimentation and low energy consumption multi-stage fly ash rinsing system, characterized by: The invention comprises a primary rinsing assembly, a secondary rinsing assembly, a tertiary rinsing assembly and a filter press assembly, wherein the primary rinsing assembly comprises a primary water-washing mixing reactor (1), a primary water-washing A-class sedimentation tank (2) and a primary water-washing B-class sedimentation tank (3) which are connected in sequence, and the secondary rinsing assembly comprises a secondary water-washing mixing reactor (4), a secondary water-washing A-class sedimentation tank (5) and a secondary water-washing B-class sedimentation tank (6) which are connected in sequence, and the primary water-washing A-class sedimentation tank (2) and the primary water-washing B-class sedimentation tank (3) are both connected to a delivery pump through a pipeline, and the output end of the delivery pump is connected to the secondary water-washing mixing reactor (4) through a pipeline; The three-stage rinsing assembly comprises a three-stage water-washing mixing reactor (7) and a three-stage water-washing A-level sedimentation tank (8) which are interconnected, and the two-stage water-washing A-level sedimentation tank (5) and the two-stage water-washing B-level sedimentation tank (6) are both connected to a delivery pump through a pipeline, and the output end of the delivery pump is connected to the three-stage water-washing mixing reactor (7) through a pipeline; The tertiary water washing A-level sedimentation tank (8) is connected to the filter press assembly via a delivery pump, and the filtrate outlet of the filter press assembly is connected to the secondary water washing mixing reactor (4).

2. The gravity sedimentation energy-saving multi-stage fly ash rinsing system according to claim 1 is characterized in that: Each reaction tank in the first-stage rinsing assembly, the second-stage rinsing assembly and the third-stage rinsing assembly is provided with a stirring assembly, and the stirring assembly includes a driving motor and a stirring blade.

3. The gravity sedimentation energy-saving multi-stage fly ash rinsing system according to claim 1 is characterized in that: An automatic adjustment weir plate is provided between the first-level water washing A-level sedimentation tank (2) and the first-level water washing B-level sedimentation tank (3), and an automatic adjustment weir plate is also provided between the second-level water washing A-level sedimentation tank (5) and the second-level water washing B-level sedimentation tank (6).

4. The gravity sedimentation energy-saving multi-stage fly ash rinsing system according to claim 1 is characterized in that: The filter press assembly comprises a first plate-frame filter press (9) and a second plate-frame filter press (10).

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