TWI763390B - Fly Ash Washing Treatment System - Google Patents

Abstract

The invention provides a fly ash water washing treatment system, comprising a fly ash storage tank, a dissolving and stirring tank, a water Washing tank, temporary storage tank and filter press dehydrator. The fly ash storage tank is used to store fly ash; the fly ash is transported to the dissolving stirring tank by the fly ash screw conveyor, and water is supplied to the dissolving stirring tank through the tap water tank, so that the fly ash and water are dissolved and stirred; the dissolved fly ash is transported to the The water washing tank makes the chlorine and heavy metals in the fly ash dissolve into the water; the fly ash dissolved in the water is transported to the temporary storage tank to continue dissolving and stirring; the fly ash dissolved in the water is transported to the filter press by the temporary storage tank pump The dehydrator performs solid-liquid separation to produce filter cake and filtrate that is sent to the filtrate storage tank. Thereby, the fly ash water washing treatment system of the present invention can dissolve the harmful substances in the fly ash, so that the product treated by the water washing procedure is more stable for reuse.

Description

Fly Ash Washing Treatment System

The present invention relates to a fly ash water washing treatment system, in particular to a fly ash water washing treatment system which is applied to treat fly ash so as to produce a product with homogeneity and stability that can be reused.

With the growth of industries and changes in life, the amount of waste generated by factories, homes, offices and other places has greatly increased, which has become the main cause of environmental degradation. Therefore, waste reduction and resource recycling are the trends. Traditionally, combustible household waste and industrial waste are treated by incineration. The incineration of domestic waste has the advantages of large-scale treatment, volume reduction, reasonable cost, and thermal energy recovery into electric energy. Most advanced countries use incineration for waste treatment. However, Waste incineration has the problem of producing fly ash.

The fly ash produced by the incineration of domestic waste and the fly ash produced by the incineration of hazardous wastes are classified as hazardous waste, and the current treatment methods for such hazardous wastes include safe landfill but high cost. In Taiwan, 96% of the waste is incinerated. The 24 incineration plants in Taiwan produce about 200,000 metric tons of harmful fly ash each year. The fly ash produced is buried in the final waste disposal site for treatment. Because the incineration ash contains cement raw materials CaO, SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ and the like are required so that resources can be sufficiently recovered as raw materials for cement heat treatment. In recent years, it has been confirmed that fly ash can be used as part of the raw material for cement production, and fly ash can be recovered for cement production. In addition, fly ash contains high-concentration chlorine in the form of NaCl, and it is necessary to treat the high-concentration chlorine in order to avoid adverse effects on the stable operability of the kiln and the quality of the cement.

In view of this, the inventors have devoted a lot of R&D energy and spirit to make breakthroughs and innovations in the field, hoping to solve the shortcomings of conventional technology with novel technical means, which will not only bring better products to the society, but also promote industrial development.

The main purpose of the present invention is to provide a fly ash water washing treatment system, which can dissolve the harmful substances in the fly ash, so that the product after the water washing procedure is more homogeneous and stable for safe reuse. Secondly, the fly ash water washing treatment system of the present invention can save the consumption of water, reduce the generation of waste water, and shorten the operation time of the whole process.

In order to achieve the above object, the present invention provides a fly ash water washing treatment system comprising a fly ash storage tank, a dissolving and stirring tank, a washing tank, a temporary storage tank and a filter press dehydrator; wherein, the fly ash storage tank is used for storage and incineration Fly ash from waste. Secondly, the fly ash is transported into a dissolving and stirring tank through a rotary valve and a plurality of fly ash screw conveyors, and tap water is supplied to the dissolving and stirring tank through at least one tap water tank and a tap water pump, so that the fly ash and water are dissolved and stirred . Furthermore, the dissolved and stirred fly ash is transported to a water washing tank, and the chlorine and heavy metals in the fly ash are further stirred to dissolve into the water; and the washed fly ash is transported to a temporary Continue to dissolve and stir in the storage tank. In addition, the dissolved and stirred fly ash is transported to a filter press dehydrator for solid-liquid separation by a temporary storage tank transport pump to generate filter cake and filtrate, and the filtrate is transported to a filtrate storage tank.

In the fly ash water washing treatment system of the present invention, a chelating agent storage tank is further included, and a chelating agent stored in the chelating agent storage tank is transported to the dissolving and stirring tank through a chelating agent pump.

In the fly ash water washing treatment system of the present invention, a filter cloth cleaning water storage tank is further included, and a plurality of filter cloths are arranged below the filter press dehydrator to collect the solids in the filtrate, and the filter cloth cleaning water storage tank. A citric acid was added to clean the used filter cloths.

In the fly ash water washing treatment system of the present invention, it further includes a compressed air storage tank, and air is transported to the compressed air storage tank through an air compressor and a compressed air source for storage, and then the air is supplied to the filter press dehydrator.

In the fly ash water washing treatment system of the present invention, a dehydrator filtrate transport pump transports the filtrate to a waste water treatment plant.

In order to achieve the above-mentioned other object, the present invention provides a fly ash washing treatment system, comprising at least one fly ash storage tank, at least one dissolving and stirring tank, one temporary storage tank, one chelating agent storage tank and at least one fly ash washing filter press; Wherein, the fly ash storage tank stores the fly ash generated by the incineration of waste; and the dissolving and stirring tank transports the fly ash into the dissolving and stirring tank through at least one fly ash screw conveyor, and provides tap water to the dissolving and stirring tank through a tap water tank In the tank, the fly ash and water are stirred to dissolve. Next, the dissolved and stirred fly ash is transported to the temporary storage tank for further stirring and dissolution, and a chelating agent in the chelating agent storage tank is transported to the temporary storage tank. Furthermore, each fly ash washing filter press transports the dissolved and stirred fly ash and the chelating agent to the fly ash washing filter press through a temporary storage tank delivery pump, and provides tap water to the The fly ash washing filter press, and then supply air to the fly ash washing filter press through an air compressor and a compressed air storage tank, so that the fly ash in the fly ash washing filter press passes through the chelating agent, The tap water and air dissolve the chlorine and heavy metals in the fly ash into the water to create a filter cake.

In the fly ash water washing treatment system of the present invention, a chemical agent tank is further included, and the chemical agent tank stores a citric acid.

In the fly ash water washing treatment system of the present invention, a circulating water tank is further included, and the filtrate is transported to the circulating water tank, and the filtrate is processed by the circulating water tank and then transported to the fly ash washing filter press for reuse or A waste water is formed.

In the fly ash water washing treatment system of the present invention, it further comprises a waste water leveling tank, the waste water is collected into a discharge water tank, and then transported to the wastewater leveling tank of a waste water treatment plant for treatment.

In the fly ash water washing treatment system of the present invention, the filter cake passes through at least one filter cake conveyor and one filter cake belt conveyor, and the filter cake is transported to a filter cake tanker or a space packaging bag.

1: Fly ash washing treatment system

10: Fly Ash Storage Tank

101: Rotary valve

102: Fly Ash Conveyor

20: Dissolving stirring tank

21: Tap Sink

211: Water pump

212: Dehydrator filter cloth cleaning pump

213: Circulating water tank

213’: Recycling tank

213": Clear water tank

2131: Wastewater

22: Chelating agent storage tank

22': Chemical tank

221: Chelating Agent Pump

30: washing tank

301: Water washing tank transfer pump

40: staging slot

401: Temporary storage tank transfer pump

50: Press filter dehydrator

51: Filtrate storage tank

511: Dehydrator filtrate transfer pump

512: Wastewater Treatment Plants

52: filter cake

521: Cake Conveyor

522: Filter cake belt conveyor

523: Cake Tanker

523': Space Bag

52': Filtrate

53: Filter cloth cleaning water storage tank

531: Filter cloth cleaning water recovery pump

54: Compressed air storage tank

541: Air compressor

55: Drain the sink

56: Wastewater mixing tank

FIG. 1 is a flow chart of a fly ash water washing treatment system according to Embodiment 1 of the present invention.

FIG. 2 is a block flow diagram of a new fly ash water washing treatment system according to Embodiment 2 of the present invention.

The embodiments of the present invention are described below by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. In addition, the present invention can also be implemented or applied by other different specific embodiments, and various modifications and changes can be made without departing from the spirit of the present invention.

Please refer to FIG. 1 . FIG. 1 is a flow chart of a fly ash water washing treatment system according to Embodiment 1 of the present invention.

As shown in FIG. 1 , the present invention provides a fly ash washing treatment system 1 including a fly ash storage tank 10, a dissolving and stirring tank 20, a washing tank 30, a temporary storage tank 40 and a filter press dehydrator 50; The fly ash storage tank 10 is used to store the fly ash generated by the incineration of wastes. The fly ash storage tank 10 adopts a funnel-shaped design, which enables the fly ash to be transported smoothly and avoids the formation of bridges. Ash deliquescence. Next, the fly ash is transported to a dissolving and stirring tank 20 through a rotary valve 101 and at least one fly ash screw conveyor 102, and tap water is supplied to the dissolving and stirring tank 20 through at least one tap water tank 21 and a tap water pump 211, and A chelating agent stored in a chelating agent storage tank 22 is transported to the dissolving and stirring tank 20 through a chelating agent pump 221, so that the fly ash, tap water and the chelating agent are dissolved and stirred. Furthermore, the dissolving and stirring fly ash is transported to a washing tank 30, and further stirring makes the chlorine and heavy metals in the fly ash dissolve into the water; Continue to dissolve and stir in a temporary storage tank 40 .

In addition, the dissolved and stirred fly ash is transported to a filter press dehydrator 50 by a temporary storage tank transport pump 401, and the air is transported to a compressed air storage tank 54 through an air compressor 541 for storage, and then the air It is supplied to the filter press dehydrator 50 for solid-liquid separation to produce a filter cake 52 and a filtrate 52'. Next, the filtrate 52' is transported to a filtrate storage tank 51, and the filtrate 52' is transported to a wastewater treatment plant 512 through a dehydrator filtrate transport pump 511 for processing, and then the filtrate storage tank 51 is processed to produce the filtrate 52' sent to the wastewater treatment plant 512. Furthermore, a plurality of filter cloths are arranged below the filter press dehydrator 50 to filter the solids in the filtrate 52', and the used filter cloths are transported to a filter cloth cleaning water storage tank 53, and a dehydration Machine filter cloth cleaning The pump 212 supplies tap water to the filter cloth cleaning water storage tank 53, and adds a citric acid to the filter cloth cleaning water storage tank 53 to clean the filter cloths. The waste generated by the filter cloth cleaning water storage tank 53 passes through a filter cloth The cleaning water recovery pump 531 is transported to a water washing tank 30 .

Please refer to FIG. 2 . FIG. 2 is a block flow diagram of a new fly ash water washing processing system according to Embodiment 2 of the present invention.

As shown in FIG. 2, the present invention provides another fly ash washing treatment system, comprising at least one fly ash storage tank 10, at least one dissolving and stirring tank 20, a temporary storage tank 40, a chelating agent storage tank 22 and at least one fly ash cleaning tank The filter press 30'; wherein, the fly ash storage tank 10 stores the fly ash generated by the incineration of waste; and through at least one fly ash screw conveyor 102, the fly ash is transported to the dissolving and stirring tank 20, through a tap water tank 21 Tap water is supplied to the dissolving stirring tank 20 to stir and dissolve the fly ash and water. Next, the dissolved and stirred fly ash is transported to the temporary storage tank 40 for further stirring and dissolution; then a chelating agent stored in the chelating agent storage tank 22 is transported to the temporary storage tank 40 . In addition, the fly ash water washing treatment system 1 may include a chemical agent tank 22', and the chemicals contained in the chemical agent tank 22' can be arbitrarily changed according to the needs of the user. In a preferred embodiment, the chemical agent tank 22 'The included agent may be a citric acid, but the present invention is not limited thereto.

As shown in FIG. 2 , the dissolved and stirred fly ash and the chelating agent are transported to the fly ash washing filter press 30 ′ via a transport pump (not shown), and the tap water provided by the tap water tank 21 is transported To the fly ash washing filter press 30 ′, then through a compressed air storage tank 54 and an air compressor 541, air is supplied to the fly ash washing filter press 30 ′, so that the fly ash washing filter press 30 The fly ash in ' dissolves chlorine and heavy metals in the fly ash into water through the chelating agent, tap water and air to produce filter cake 52 and filtrate. Next, the filtrate is transported to the circulating water tank 213, and the filtrate is processed by the circulating water tank 213 and then transported to the fly ash washing filter press 30' for reuse or forming a waste water 2131; wherein, the fly ash washing The water used by the filter press 30' can also be secondary water stored in a recovery water tank 213', or tap water supplied to a clean water tank 213" via the tap water tank 21. The waste water 2131 is collected into a In the discharge water tank 55, it is transported to a wastewater leveling tank 56 of the wastewater treatment plant for treatment. In addition, the filter cake 52 passes through a plurality of filter cake conveyors 521 And a filter cake belt conveyor 522, the filter cake 52 is transported to a filter cake tanker 523 or a space bag 523'.

To sum up, the fly ash water washing treatment system of the present invention can dissolve the harmful substances in the fly ash so that the harmful fly ash becomes harmless, and the product after the water washing procedure is more stable for reuse. Secondly, the invention of the fly ash water washing treatment system can save the use of water to reduce the generation of waste water and shorten the operation time of the whole process.

However, the above are only preferred embodiments of the present invention, and are not intended to limit the scope of patent protection of the present invention. Therefore, any equivalent changes made by using the contents of the description and drawings of the present invention are all included in the rights of the present invention. Within the scope of protection, I agree to Chen Ming.

1: Fly ash washing treatment system

10: Fly Ash Storage Tank

101: Rotary valve

102: Fly Ash Conveyor

20: Dissolving stirring tank

21: Tap Sink

211: Water pump

212: Dehydrator filter cloth cleaning pump

22: Chelating agent storage tank

221: Chelating Agent Pump

30: washing tank

301: Water washing tank transfer pump

40: staging slot

401: Temporary storage tank transfer pump

50: Press filter dehydrator

51: Filtrate storage tank

511: Dehydrator filtrate transfer pump

512: Wastewater Treatment Plants

52: filter cake

52': Filtrate

53: Filter cloth cleaning water storage tank

531: Filter cloth cleaning water recovery pump

54: Compressed air storage tank

541: Air compressor

Claims (8)

A fly ash water washing treatment system, comprising: a fly ash storage tank for storing fly ash generated by burning waste; a dissolving and stirring tank for transporting fly ash to the dissolving and stirring tank through a rotary valve and a plurality of fly ash screw conveyors , supply tap water to the dissolving and stirring tank through a tap water tank and a tap water pump, so that the fly ash and water are dissolved and stirred; a water washing tank, the dissolved and stirred fly ash is transported to the water washing tank, and further stirred to make the fly ash in the The chlorine and heavy metals are dissolved into water; a temporary storage tank, the washed fly ash is transported to the temporary storage tank by a water washing tank pump to continue dissolving and stirring; a filter press dehydrator, which is transported by a temporary storage tank The pump transports the dissolved and stirred fly ash to the filter press dehydrator for solid-liquid separation to produce filter cake and filtrate, and the filtrate is transported to a filtrate storage tank; and a filter cloth cleaning water storage tank, below the filter press dehydrator A plurality of filter cloths are arranged to collect the solids in the filtrate, and a citric acid is added to the filter cloth washing water storage tank to wash the used filter cloths. The fly ash water-washing treatment system as described in claim 1 further comprises a chelating agent storage tank, and a chelating agent stored in the chelating agent storage tank is transported into the dissolving and stirring tank through a chelating agent pump. The fly ash water-washing treatment system described in item 1 of the scope of the application further comprises a compressed air storage tank, and air is transported to the compressed air storage tank through an air compressor and a compressed air source for storage, and then the air is supplied to the compressed air storage tank. Filter press dehydrator. The fly ash water washing treatment system as described in claim 1, wherein the filtrate is transported to a wastewater treatment plant through a dehydrator filtrate transport pump. A fly ash water washing treatment system, comprising: at least one fly ash storage tank for storing fly ash generated by burning waste; At least one dissolving and stirring tank, through at least one fly ash screw conveyor, the fly ash is transported to the dissolving and stirring tank, and then tap water is supplied to the dissolving and stirring tank through a tap water tank, so that the fly ash and water are stirred and dissolved; a temporary storage a chelating agent storage tank, transporting a chelating agent stored in the chelating agent storage tank to the temporary storage tank; at least one fly ash is removed Wash the filter press, transport the dissolved and stirred fly ash and the chelating agent to the fly ash washing filter press via a delivery pump, and transport the tap water provided by the tap water tank to the fly ash washing filter press , and then supply air to the fly ash washing filter press through a compressed air storage tank and an air compressor, so that the fly ash in the fly ash washing filter press passes through the chelating agent, tap water and air. The chlorine and heavy metals are dissolved in water to produce a filter cake; and a chemical tank storing a citric acid. The fly ash washing treatment system described in item 5 of the scope of the application further comprises a circulating water tank, and the filtrate is transported to the circulating water tank, and the filtrate is processed by the circulating water tank, and then transported to the fly ash washing. The filter press is reused or formed into a waste water. The fly ash washing treatment system as described in item 5 of the patent application scope further includes a waste water leveling tank, the wastewater is collected into a discharge water tank, and then transported to the wastewater leveling tank of a waste water treatment plant for treatment. The fly ash water washing treatment system as described in claim 5, wherein the filter cake is transported to a filter cake tanker or a space through at least one filter cake conveyor and a filter cake belt conveyor bag.

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