Resourceful treatment system for domestic incineration fly ash

Abstract

The utility model provides a domestic incineration fly ash resourceful treatment system. The domestic incineration fly ash resourceful treatment system comprises an anaerobic cracking device, a slurrying stirrer, a washing filter pressing device, a brick making device, an impurity removing device, a filtering device, a PH adjusting device and an evaporation concentration device which are sequentially arranged, the slurrying stirrer is used for mixing the fly ash with water and slurrying the fly ash; the washing and filter pressing device is used for carrying out washing and filter pressing on the starch water to obtain rinsing water and washing residues; the brick making device is used for making the washing slag into baking-free bricks; the impurity removal device is used for removing heavy metals and calcium in the rinsing water; the filtering device is used for filtering the rinsing water; the PH adjusting device is used for adjusting the PH of the filtered solution; the evaporation and concentration device is used for evaporating and concentrating the solution to obtain crystal salt and distilled water. The household incineration fly ash resourceful treatment system disclosed by the utility model can be used for realizing resourceful utilization of household garbage incineration fly ash, is energy-saving and environment-friendly, has no secondary pollution, and has remarkable environmental benefits and social benefits.

Description

Technical Field

[0001] The utility model relates to a domestic garbage treatment system, in particular to a domestic incineration fly ash resource treatment system. Background Art

[0002] At present, some incineration fly ash is directly washed and pretreated before being sent to cement kilns for co-treatment. The washed slag after washing is used as raw material for cement production. However, cement has very strict control requirements on chlorine content, and the ability of cement kilns to co-treat fly ash is very limited. Fly ash contains very small amounts of dioxin carcinogens. If the fly ash is not pretreated before washing, it may affect the physical and mental health of on-site operators. In addition, the wastewater generated after washing contains a large amount of sodium chloride and potassium chloride. Currently, the resource recovery of salt is not complete and does not meet product requirements. It is even disposed of as solid waste, increasing production and operation costs. Utility Model Content

[0003] [1] Technical issues to be solved

[0004] The technical problem to be solved by the utility model is to provide a system for processing fly ash resources from domestic incineration with high processing efficiency, good effect, resource regeneration and good economic benefits.

[0005] 【2】Technical solutions to solve the problem

[0006] The utility model provides a system for resource processing of domestic incineration fly ash, which comprises:

[0007] Anaerobic pyrolysis device, used for anaerobic pyrolysis of domestic waste to obtain fly ash and flue gas;

[0008] A slurry mixer 3, connected to the ash outlet of the anaerobic cracking device, for mixing fly ash with water and slurrying the fly ash;

[0009] A water washing and filter pressing device is connected to the liquid outlet of the slurry mixer 3, and is used to wash and filter the slurry water to obtain rinsing water and washed residue;

[0010] A brick-making device, connected to the slag discharge end of the water-washing filter press device, for making unburned bricks from the water-washing slag;

[0011] An impurity removal device, connected to the liquid outlet of the water washing filter press device, for removing heavy metals and calcium from the rinsing water;

[0012] A filtering device connected to the liquid outlet of the impurity removal device and used for filtering the rinsing water;

[0013] A pH adjusting device, connected to the liquid outlet of the filtering device, for adjusting the pH of the filtered solution;

[0014] The evaporation concentration device is connected to the liquid outlet of the pH regulating device and is used to evaporate and concentrate the solution to obtain crystallized salt and distilled water. The distilled water is connected to the liquid inlet of the water washing filter press device through a pipeline and used as rinsing water.

[0015] Furthermore, the anaerobic cracking device comprises a medium-temperature anaerobic cracking furnace 1 and a flue gas treatment device 2 arranged at the gas outlet end of the medium-temperature anaerobic cracking furnace 1 .

[0016] Furthermore, the impurity removal device includes a heavy metal removal device and a calcium removal device which are connected in sequence.

[0017] Furthermore, the heavy metal removal device includes a first reaction tank 24 and a fourth filter press 26 connected in sequence, the slag outlet of the fourth filter press 26 is used to discharge the sludge containing heavy metals, and the liquid outlet of the fourth filter press 26 is connected to the decalcification device.

[0018] Furthermore, the brick-making device comprises a mixing and stirring device 17, a pressing and forming device 18 and a steam curing device which are connected in sequence.

[0019] Furthermore, the water washing filter press device comprises a rinsing tank and a filter press connected in sequence, and a filter press pump is provided between the rinsing tank and the filter press.

[0020] Furthermore, the water washing filter press devices are multiple and connected in series, and a crusher for crushing the filter cake discharged from the filter press is provided between two adjacent water washing devices.

[0021] Furthermore, the water washing filter press device includes a primary water washing filter press device, a secondary water washing filter press device and a tertiary water washing filter press device connected in sequence, the liquid outlet of the first filter press 6 on the primary water washing filter press device is connected to the impurity removal device, the liquid outlet of the second filter press 10 on the secondary water washing filter press device is connected to the feed end of the slurry mixer 3, the liquid outlet of the third filter press 16 on the tertiary water washing filter press device is connected to the feed end of the secondary water washing filter press device, and the distilled water outlet of the evaporation concentration device is connected to the feed end of the tertiary water washing filter press device.

[0022] Furthermore, the impurity removal device is provided with a second reaction tank 29 and a fifth filter press 31 for removing calcium. The fifth filter press 31 is arranged at the outlet end of the second reaction tank 29. The slag outlet of the fifth filter press 31 is provided with a third crusher 32. The discharge port of the third crusher 32 is connected to the feed end of the secondary water washing filter press device, and the liquid outlet of the fifth filter press 31 is connected to the filtering device.

[0023] Furthermore, the filtering device includes a primary filtering device 35 and a secondary filtering device 36 which are connected in sequence.

[0024] 【3】Beneficial effects

[0025] The system for resource processing of fly ash from incineration of domestic waste in the present application includes medium-temperature anaerobic pyrolysis, a slurry mixer, primary water washing, secondary water washing, tertiary water washing, brick making, heavy metal removal, calcium removal, sand filtration, fine filtration, pH adjustment, evaporation concentration and salt crystallization, which can realize the comprehensive resource utilization of fly ash from incineration of domestic waste, reduce the risk of dioxin carcinogens produced during the water washing process that endangers the physical and mental health of operators, and the washed slag after water washing can be made into unfired bricks; the sodium chloride and potassium chloride salts that meet the relevant product standards obtained by refining the water-washing salt solution achieve the purpose of resource regeneration and create good economic benefits, while reducing the risk of secondary pollution caused by landfill disposal, saving a large amount of hazardous waste disposal costs, having significant environmental and social benefits, and energy conservation and environmental protection.

[0026] Specifically, the advantages of this application are reflected in the following aspects:

[0027] 1. The fly ash from the incineration of domestic waste can be treated in a reasonable and optimized way. The washed slag after water washing can be made into unburned bricks. The sodium chloride and potassium chloride salts that meet the relevant product standards obtained by refining the washed salt solution have achieved resource regeneration and have considerable economic benefits.

[0028] 2. Adopt resource-based treatment methods to reduce landfill, save a lot of land resources, reduce the risk of secondary pollution caused by landfill disposal, and have good environmental benefits;

[0029] 3. Using medium-temperature anaerobic pyrolysis as a pretreatment for fly ash washing can significantly degrade dioxins in fly ash and reduce the risk of dioxin carcinogens produced during the washing process that endanger the physical and mental health of operators; 4. Achieve complete and comprehensive recycling of wastewater without wastewater discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a connection block diagram of the utility model domestic incineration fly ash resource processing system;

[0031] Figure 2 It is a connection block diagram of the anaerobic cracking device of the domestic incineration fly ash resource processing system of the utility model;

[0032] Figure 3 It is a connection block diagram of the water-washing filter press device of the domestic incineration fly ash resource processing system of the utility model;

[0033] Figure 4 It is a connection block diagram of the heavy metal removal device of the domestic incineration fly ash resource processing system of the utility model;

[0034] Figure 5It is a connection block diagram of the decalcification device of the domestic incineration fly ash resource processing system of the utility model;

[0035] Figure 6 This is a connection block diagram of the filtering and concentrating device of the domestic incineration fly ash resource processing system of the utility model. DETAILED DESCRIPTION

[0036] The following is a detailed description of the embodiments of the present utility model in conjunction with the accompanying drawings.

[0037] See also Figure 1-Figure 6 The utility model provides a domestic incineration fly ash resource processing system, which includes an anaerobic cracking device, a slurry mixer 3, a water washing filter press device, a brick making device, an impurity removal device, a filtering device, a PH regulating device and an evaporation concentration device.

[0038] Among them, the anaerobic cracking device includes a medium-temperature anaerobic cracking furnace 1 and a flue gas treatment device 2 arranged at the outlet end of the medium-temperature anaerobic cracking furnace 1. The medium-temperature anaerobic cracking furnace 1 is used to electrically heat domestic waste. The heating temperature of the medium-temperature anaerobic cracking furnace 1 is lower than 600 degrees Celsius, which is used to remove a very small amount of dioxins in fly ash. After heating in the medium-temperature anaerobic cracking furnace, fly ash and high-temperature flue gas are obtained. Among them, the high-temperature flue gas is treated by the flue gas treatment device 2 to remove toxic and harmful gases. The toxic and harmful gases include acidic gases (such as SO2, HCl, HF, etc.) and nitrogen oxides (such as NOx), which are discharged into the atmosphere after meeting the emission conditions.

[0039] The slurry mixer 3 is connected to the ash outlet of the anaerobic cracking device and is used to mix the fly ash with water and slurry the fly ash by stirring to obtain slurry water.

[0040] The water-washing filter press device is connected to the liquid outlet end of the slurry mixer 3, and is used to wash and filter the slurry water, and obtain rinsing water and water-washed residue, wherein the rinsing water is liquid and the water-washed residue is solid; the water-washing filter press device includes a rinsing tank and a filter press connected in sequence, and a stirring blade is provided in the rinsing tank for stirring, and a filter press pump is provided between the rinsing tank and the filter press for conveying; the water-washing filter press device is multiple and connected in series, and a crusher is provided between two adjacent water-washing devices, and the crusher is used to crush the filter cake discharged from the filter press on the previous filter device to achieve water washing and filtering again; in the present application, the water-washing filter press device includes a primary water-washing filter press device, a secondary water-washing filter press device and a tertiary water-washing filter press device connected in sequence;

[0041] The primary water-washing filter press device comprises a first rinsing tank 4 and a first filter press 6 connected in sequence, and a first filter press pump 5 is provided between the first rinsing tank 4 and the first filter press 6 for conveying the solution in the first rinsing tank 4 to the first filter press 6; the secondary water-washing filter press device comprises a second rinsing tank 8 and a second filter press 10 connected in sequence, and a second filter press pump 9 is provided between the second rinsing tank 8 and the second filter press 10 for conveying the solution in the second rinsing tank 8 to the second filter press 10; the tertiary water-washing filter press device comprises a third rinsing tank 12 and a third filter press 16 connected in sequence, and a third filter press pump 13 is provided between the third rinsing tank 12 and the third filter press 16 for conveying the solution in the third rinsing tank 12 to the third filter press 16; wherein, in the first filter press A first crusher 7 is provided at the slag outlet of filter press 6, and the discharge port of the first crusher is connected to the feed port of the second rinsing tank 8. A second crusher 11 is provided at the slag outlet of the second filter press 10, and the discharge port of the second crusher is connected to the feed port of the third rinsing tank 12; and the liquid outlet of the first filter press 6 is connected to the impurity removal device, and the liquid outlet of the second filter press 10 is connected to the feed end of the slurry mixer 3 after passing through the first filtrate tank 14 and the first lifting pump 15 in sequence; the liquid outlet of the third filter press 16 is connected to the feed end of the second rinsing tank 8 (secondary water washing filter press device) after passing through the second filtrate tank 20 and the second lifting pump 21 in sequence, and the distilled water outlet of the evaporation concentration device is connected to the feed end of the third rinsing tank 12 (tertiary water washing filter press device) after passing through the seventh lifting pump 42, so as to realize circulating liquid supply.

[0042] The brick-making device is connected to the slag discharge end of the water-washing filter press device. In the present embodiment, it is connected to the slag discharge port of the third filter press 16, and is used to make the water-washing slag into unburned bricks. The brick-making device comprises a mixing and stirring device 17, a pressing and molding device 18 and a steam curing device 19 which are connected in sequence, wherein the mixing and stirring device 17 is used to mix and stir the materials to improve their uniformity, the pressing and molding device 18 is used to press and mold the stirred materials to form a brick body, and the steam curing device 19 is used to harden the molded brick body by high-temperature steam.

[0043] The impurity removal device is connected to the liquid outlet end of the water washing filter press device, and is used to remove heavy metals and calcium in the rinsing water; in this embodiment, the impurity removal device includes a heavy metal removal device and a calcium removal device connected in sequence, wherein the heavy metal removal device is used to remove heavy metals in the rinsing water, and the calcium removal device is used to remove calcium in the rinsing water.

[0044] Specifically, the heavy metal removal device includes a first reaction tank 24 and a fourth filter press 26 connected in sequence. Sodium sulfide is added to the first reaction tank to form a chemical reaction with the heavy metals in the rinsing water. A fourth filter press pump 25 is provided between the first reaction tank 24 and the fourth filter press 26 to realize fluid transportation; the slag outlet of the fourth filter press 26 can discharge sludge containing heavy metals, and a third filtrate tank 22 and a third lift pump 23 are provided at the front end of the first reaction tank 24, wherein the third filtrate tank 22 is connected to the liquid outlet of the first filter press; the liquid outlet of the fourth filter press 26 is connected to the decalcification device after passing through the fourth filtrate tank 27 and the fourth lift pump 28.

[0045] The decalcification device includes a second reaction tank 29 and a fifth filter press 31 connected in sequence. A fifth filter press pump 30 is provided between the second reaction tank 29 and the fifth filter press 31 for realizing fluid transportation. A third crusher 32 is provided at the slag outlet of the fifth filter press 31. The third crusher 32 is used to crush the calcium carbonate sludge pressed by the fifth filter press 31. The discharge port of the third crusher 32 is connected to the feed end of the second rinsing tank 8 (secondary water washing filter press device). The liquid outlet of the fifth filter press 31 is connected to the filtering device after passing through the fifth filtrate tank 33 and the fifth lifting pump 34.

[0046] The filtering device is used to filter the rinsing water, and includes a primary filtering device 35 and a secondary filtering device 36 connected in sequence, wherein the primary filtering device 35 is a sand filter (coarse filter) and the secondary filtering device 36 is a fine filter.

[0047] The pH regulating device is connected to the liquid outlet of the filtering device and is used to regulate the pH of the filtered solution. The pH regulating device includes a tank 37 for adding dilute hydrochloric acid and achieving pH regulation.

[0048] The evaporation and concentration device is connected to the liquid outlet of the pH regulating device, and is used to evaporate and concentrate the solution to obtain crystallized salt and distilled water. It includes a refined mixed salt solution tank 38, a sixth lifting pump 39, and an evaporation and concentration salt separation crystallization device 40 connected in sequence. After evaporation and concentration by the evaporation and concentration salt separation crystallization device 40, crystallized salt (solid) and distilled water (liquid) are obtained. Among them, the liquid outlet of the evaporation and concentration salt separation crystallization device 40 is provided with a distilled water tank 41, which is connected to the feed end of the second rinsing tank 8 through the seventh lifting pump 42 and is reused as rinsing water.

[0049] The system for resource processing of fly ash from incineration of domestic waste in the present application includes medium-temperature anaerobic pyrolysis, a slurry mixer, primary water washing, secondary water washing, tertiary water washing, brick making, heavy metal removal, calcium removal, sand filtration, fine filtration, pH adjustment, evaporation concentration and salt crystallization, which can realize the comprehensive resource utilization of fly ash from incineration of domestic waste, reduce the risk of dioxin carcinogens produced during the water washing process that endangers the physical and mental health of operators, and the washed slag after water washing can be made into unfired bricks; the sodium chloride and potassium chloride salts that meet the relevant product standards obtained by refining the water-washing salt solution achieve the purpose of resource regeneration and create good economic benefits, while reducing the risk of secondary pollution caused by landfill disposal, saving a large amount of hazardous waste disposal costs, having significant environmental and social benefits, and energy conservation and environmental protection.

[0050] Specifically, the advantages of this application are reflected in the following aspects:

[0051] 1. The fly ash from the incineration of domestic waste can be treated in a reasonable and optimized way. The washed slag after water washing can be made into unburned bricks. The sodium chloride and potassium chloride salts that meet the relevant product standards obtained by refining the washed salt solution have achieved resource regeneration and have considerable economic benefits.

[0052] 2. Adopt resource-based treatment methods to reduce landfill, save a lot of land resources, reduce the risk of secondary pollution caused by landfill disposal, and have good environmental benefits;

[0053] 3. Using medium-temperature anaerobic pyrolysis as a pretreatment for fly ash washing can significantly degrade dioxins in fly ash and reduce the risk of dioxin carcinogens produced during washing that endanger the physical and mental health of operators;

[0054] 4. Realize complete and comprehensive recycling of wastewater without wastewater discharge.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A system for recycling fly ash from domestic incineration, characterized in that: include: Anaerobic pyrolysis device, used for anaerobic pyrolysis of domestic waste to obtain fly ash and flue gas; A slurry mixer connected to the ash outlet of the anaerobic cracking device, used for mixing fly ash with water and slurrying the fly ash; A water washing and filter pressing device is connected to the liquid outlet of the slurry mixer and is used to wash and filter the slurry water to obtain rinsing water and water-washed residue; A brick-making device, connected to the slag discharge end of the water-washing filter press device, for making unburned bricks from the water-washing slag; An impurity removal device, connected to the liquid outlet of the water washing filter press device, for removing heavy metals and calcium from the rinsing water; A filtering device connected to the liquid outlet of the impurity removal device and used for filtering the rinsing water; A pH adjusting device, connected to the liquid outlet of the filtering device, for adjusting the pH of the filtered solution; The evaporation concentration device is connected to the liquid outlet of the pH regulating device and is used to evaporate and concentrate the solution to obtain crystallized salt and distilled water. The distilled water is connected to the liquid inlet of the water washing filter press device through a pipeline and used as rinsing water.

2. The system for recycling fly ash from incineration of domestic waste as claimed in claim 1, characterized in that: The anaerobic cracking device comprises a medium-temperature anaerobic cracking furnace and a flue gas treatment device arranged at the gas outlet end of the medium-temperature anaerobic cracking furnace.

3. The system for recycling fly ash from domestic incineration as claimed in claim 1, characterized in that: The impurity removal device comprises a heavy metal removal device and a calcium removal device which are connected in sequence.

4. The system for recycling fly ash from incineration of domestic waste as claimed in claim 3, characterized in that: The heavy metal removal device comprises a first reaction tank and a fourth filter press which are connected in sequence. The slag outlet of the fourth filter press is used to discharge the sludge containing heavy metals. The liquid outlet of the fourth filter press is connected to the decalcification device.

5. The system for recycling fly ash from domestic incineration as claimed in claim 1, characterized in that: The brick making device comprises a mixing and stirring device, a pressing and forming device and a steam curing device which are connected in sequence.

6. The system for recycling fly ash from domestic incineration as claimed in claim 1, characterized in that: The water-washing filter press device comprises a rinsing tank and a filter press which are connected in sequence, and a filter press pump is arranged between the rinsing tank and the filter press.

7. The system for recycling fly ash from domestic incineration as claimed in claim 6, characterized in that: There are multiple water-washing filter press devices connected in series, and a crusher for crushing the filter cake discharged from the filter press is provided between two adjacent water-washing devices.

8. The system for recycling fly ash from domestic incineration as claimed in claim 6, characterized in that: The water-washing filter press device comprises a primary water-washing filter press device, a secondary water-washing filter press device and a tertiary water-washing filter press device which are connected in sequence, the liquid outlet of the first filter press on the primary water-washing filter press device is connected to the impurity removal device, the liquid outlet of the second filter press on the secondary water-washing filter press device is connected to the feed end of the slurry mixer, the liquid outlet of the third filter press on the tertiary water-washing filter press device is connected to the feed end of the secondary water-washing filter press device, and the distilled water outlet of the evaporation and concentration device is connected to the feed end of the tertiary water-washing filter press device.

9. The system for recycling fly ash from domestic incineration as claimed in claim 8, characterized in that: The impurity removal device is provided with a second reaction tank for removing calcium and a fifth filter press, the fifth filter press is arranged at the outlet end of the second reaction tank, the slag outlet of the fifth filter press is provided with a third crusher, the discharge port of the third crusher is connected to the feed end of the secondary water washing filter press device, and the liquid outlet of the fifth filter press is connected to the filtering device.

10. The system for recycling fly ash from domestic incineration as claimed in claim 1, characterized in that: The filtering device comprises a primary filtering device and a secondary filtering device which are connected in sequence.

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