Integrated fly ash washing skid-mounted equipment

Abstract

The integrated fly ash washing skid-mounted equipment comprises a water tank, the water tank comprises a pre-dissolving bin and a flotation bin which are sequentially communicated, the pre-dissolving bin is provided with a feeding port, a baffle, a first stirrer and a second stirrer, and the flotation bin is provided with an aeration device, a third stirrer, a floating foam scraper, an overflow port, a floating foam outlet, a tail gas outlet and a discharging port. According to the equipment, incineration fly ash is washed with a high water-cement ratio, and after one-time dehydration, the content of soluble chlorine in a solid phase can be guaranteed to be within the range of 1%. In addition, by combining the hydrophobic characteristic of the activated carbon and utilizing the air flotation principle, the activated carbon is subjected to air flotation separation by aerating in the flotation bin, so that the concentration of dioxin in the fly ash can be greatly reduced; the treated fly ash can be subjected to deep decomposition of dioxin by adopting the technologies of low-temperature pyrolysis, damp-heat oxidation and the like, so that the reaction conditions of the dioxin decomposition technology can be reduced, and the comprehensive cost is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of incineration fly ash water washing, and particularly relates to an integrated fly ash water washing skid-mounted equipment. Background Art

[0002] Incineration fly ash is the largest source of hazardous waste in Chinese cities, and its safe handling is crucial to the sustainable operation of cities. Currently, landfill is the primary method of disposal for incineration fly ash in my country. However, with increasing fly ash production, some cities are experiencing insufficient landfill capacity. Against this backdrop, fly ash resource utilization has become an inevitable option for future fly ash disposal.

[0003] Incineration fly ash is typically produced from the incineration of domestic waste, general industrial solid waste, and hazardous waste. Under high temperatures, chlorine in the incineration raw materials migrates to the gas phase and is enriched in the fly ash during the deacidification and dust removal process, resulting in a large amount of soluble chloride salts in the fly ash. The presence of chloride salts can cause corrosion in fly ash disposal equipment and restrict the end-use scenarios of fly ash disposal products. Traditional fly ash-cement kiln co-treatment generally uses countercurrent water washing to dechlorinate the fly ash. After dechlorination, the fly ash enters the cement kiln, which significantly reduces the corrosion of chlorine on the equipment and improves product quality. Observing the operation of the countercurrent water washing process, it can be seen that the countercurrent water washing process is cumbersome and requires multiple washing and dehydration steps. The dehydration equipment is high-power and energy-consuming. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide an integrated fly ash water washing skid-mounted equipment to solve the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized by the following technical solutions:

[0006] Provided is an integrated fly ash washing skid-mounted equipment, comprising a water tank, wherein the liquid in the water tank overflows at least half of the internal vertical height of the water tank, the water tank is provided with a tap water replenishment port, the water tank comprises a pre-dissolution bin and a flotation bin connected in sequence, the pre-dissolution bin is provided with a feed port, a baffle, a first agitator, and a second agitator, the first agitator being provided at a liquid level position near the feed port, the baffle being vertically provided on a side of the first agitator facing away from the feed port, the second agitator being provided on a side wall of the pre-dissolution bin near the bottom, the flotation bin being provided with an aeration device, a third agitator, a froth scraper, an overflow port, a froth outlet, an exhaust gas outlet, and a discharge port, the aeration device being provided at the bottom of the flotation bin, the third agitator being provided on the side wall of the flotation bin near the bottom, the liquid surface froth being propelled by the froth scraper and overflowing from the froth outlet, the overflow port being provided at a liquid level position near the pre-dissolution bin, and the exhaust gas outlet being located at the top of the flotation bin.

[0007] As described in the integrated fly ash water washing skid-mounted equipment, the top of the baffle is connected to the top of the water tank, the lower end of the baffle extends below the liquid surface, a plurality of ventilation holes are reserved in the part of the baffle that contacts the air, and the length of the baffle is 1 / 2 to 2 / 3 of the internal vertical height of the water tank.

[0008] As for the integrated fly ash washing skid-mounted equipment, wherein the second agitator is located below the feed inlet, and the third agitator is evenly distributed on both sides of the aeration device.

[0009] For example, in the integrated fly ash washing skid-mounted equipment, the aeration device includes a plurality of aeration ports connected to external compressed air through pipelines.

[0010] As for the integrated fly ash water washing skid-mounted equipment, wherein the second agitator and the third agitator are both impeller agitators.

[0011] As described in the integrated fly ash washing skid-mounted equipment, the froth scraper includes a transmission wheel, a transmission belt and a scraper. The transmission belt realizes closed-loop transmission through the transmission wheel. The scrapers are vertically fixed on the transmission belt at intervals in sequence. The scrapers extend 1 to 5 cm below the liquid surface.

[0012] As described in the integrated fly ash water washing skid-mounted equipment, wherein the first agitator is a curved blade disc turbine agitator.

[0013] As described in the integrated fly ash washing skid-mounted equipment, wherein the exhaust gas outlet is provided with an exhaust gas collection hood.

[0014] As for the integrated fly ash water washing skid-mounted equipment, wherein the bottom of the water tank forms an angle of 1 to 5 degrees with the horizontal plane and is inclined toward the discharge port.

[0015] The beneficial effects of the technical solution of this utility model are:

[0016] 1. Change the existing batch-type washing method of fly ash, simplify the fly ash washing process, and adopt a high water-ash ratio to wash the incineration fly ash. After one dehydration, the soluble chlorine content in the solid phase can be guaranteed to be within 1%;

[0017] 2. Combining the hydrophobic characteristics of activated carbon and utilizing the flotation principle, while dechlorinating the fly ash, some activated carbon particles in the fly ash can be flotated and separated, which can significantly reduce the dioxin content in the incineration fly ash after water washing;

[0018] 3. The treated fly ash can be subjected to low-temperature pyrolysis, wet thermal oxidation and other technologies to deeply decompose dioxins, which can reduce the reaction conditions of dioxin decomposition technology and reduce the overall cost;

[0019] 4. Realize the continuous operation of incineration fly ash washing and reduce the number of dehydration times of incineration fly ash, which can reduce the construction cost and disposal cost of incineration fly ash washing and replace the traditional multi-stage water washing tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic structural diagram of a preferred embodiment of the utility model;

[0022] Figure 2 for Figure 1 Middle AA section view;

[0023] In the figure: 1. Water tank; 2. Tap water filling port; 3. Feed port; 4. Baffle; 5. First agitator; 6. Second agitator; 7. Aeration device; 8. Third agitator; 9. Froth scraper; 10. Overflow port; 11. Froth outlet; 12. Exhaust gas outlet; 13. Discharge port; 14. Vent. DETAILED DESCRIPTION

[0024] The terms "utility model" and "the present invention" as used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered as limiting.

[0025] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0026] The use of "including," "having," and "comprising" and variations thereof herein is intended to encompass the items listed thereafter and equivalents thereof, as well as additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, and rear in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally define or limit the present invention in any manner. Furthermore, terms such as "first," "second," and "third" are used herein for descriptive purposes and are not intended to indicate or imply importance or significance.

[0027] See Figure 1 、 Figure 2 As shown, the integrated fly ash washing skid-mounted equipment of the present invention includes a water tank 1. The liquid in the water tank 1 covers at least half of the internal vertical height of the water tank 1. The water tank 1 is equipped with a tap water replenishment port 2. The water tank 1 includes a pre-dissolution chamber and a flotation chamber, which are connected in sequence. The pre-dissolution chamber is equipped with a feed port 3, a baffle 4, a first agitator 5, and a second agitator 6. The first agitator 5 is located at the liquid level near the feed port 3. The baffle 4 is vertically installed on the side of the first agitator 5 facing away from the feed port 3. The second agitator 6 is installed on the side wall of the pre-dissolution chamber near the bottom. The flotation bin is provided with an aeration device 7, a third agitator 8, a froth scraper 9, an overflow port 10, a froth outlet 11, a tail gas outlet 12 and a discharge port 13. The aeration device 7 is provided at the bottom of the flotation bin, the third agitator 8 is provided on the side wall of the flotation bin near the bottom, the froth on the liquid surface is boosted by the froth scraper 9 and overflows from the froth outlet, the overflow port 10 is provided at a liquid level position close to the pre-dissolution bin, the bottom of the overflow port 10 is flush with the liquid level, the bottom of the froth outlet 11 is 1 to 5 cm above the liquid level, and the tail gas outlet 12 is located at the top of the flotation bin.

[0028] The top of the baffle 4 is connected to the top of the water tank 1, and the lower end of the baffle 4 extends below the liquid level. A plurality of vent holes 14 are reserved in the part of the baffle 4 that contacts the air. The length of the baffle 4 is 1 / 2 to 2 / 3 of the internal vertical height of the water tank 1.

[0029] The second stirrer 6 is located below the feed port 3, and the third stirrer 8 is evenly distributed on both sides of the aeration device 7. Figure 1 The arrows in FIG. 1 show the flow path of the fly ash. The fly ash and the flotation agent are added from the feed port 3 , and the dechlorinated fly ash slurry is finally discharged from the discharge port 13 .

[0030] The aeration device 7 includes a plurality of aeration ports connected to external compressed air through pipelines.

[0031] The second stirrer 6 and the third stirrer 8 are both impeller stirrers.

[0032] The froth scraper 9 comprises a transmission wheel, a transmission belt and a scraper. The transmission belt realizes closed-loop transmission through the transmission wheel. The scrapers are fixed on the transmission belt at intervals in a vertical direction. The scrapers extend 1 to 5 cm below the liquid surface to ensure that the froth is removed in time.

[0033] The first agitator 5 is a curved blade disc turbine agitator.

[0034] The tail gas outlet 12 is provided with a tail gas collecting cover to reduce the direct emission of tail gas.

[0035] The bottom of the water tank 1 forms an angle of 1 to 5 degrees with the horizontal plane and is inclined toward the discharge port 13 to improve the discharge efficiency.

[0036] This equipment uses a high water-to-ash ratio to wash incineration fly ash. After primary dehydration, it ensures that the soluble chlorine content in the solid phase is within 1%. Furthermore, by combining the hydrophobic properties of activated carbon and utilizing the principle of flotation, this new device aerates the flotation chamber to separate the activated carbon, significantly reducing dioxin concentrations in the fly ash. The treated fly ash can then be subjected to low-temperature pyrolysis, wet thermal oxidation, and other technologies for deep decomposition of dioxins, reducing the reaction conditions for dioxin decomposition technology and overall costs.

[0037] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated fly ash washing skid-mounted equipment, characterized in that: The invention comprises a water tank, wherein the liquid in the water tank overflows at least half of the internal vertical height of the water tank, the water tank is provided with a tap water replenishing port, the water tank comprises a pre-dissolution bin and a flotation bin connected in sequence, the pre-dissolution bin is provided with a feed port, a baffle, a first agitator and a second agitator, the first agitator is provided at a liquid level position near the feed port, the baffle is vertically provided on the side of the first agitator facing away from the feed port, the second agitator is provided on the side wall of the pre-dissolution bin near the bottom, the flotation bin is provided with an aeration device, a third agitator, a froth scraper, an overflow port, a froth outlet, an exhaust gas outlet and a discharge port, the aeration device is provided at the bottom of the flotation bin, the third agitator is provided on the side wall of the flotation bin near the bottom, the froth on the liquid surface is propelled by the froth scraper and overflows from the froth outlet, the overflow port is provided at a liquid level position near the pre-dissolution bin, the bottom of the overflow port is flush with the liquid level, and the exhaust gas outlet is located at the top of the flotation bin.

2. The integrated fly ash washing skid-mounted equipment according to claim 1, characterized in that: The top of the baffle is connected to the top of the water tank, the lower end of the baffle extends below the liquid surface, a plurality of vent holes are reserved in the part of the baffle in contact with the air, and the length of the baffle is 1 / 2 to 2 / 3 of the internal vertical height of the water tank.

3. The integrated fly ash washing skid-mounted equipment according to claim 1, characterized in that: The second agitator is located below the feed port, and the third agitators are evenly distributed on both sides of the aeration device.

4. The integrated fly ash washing skid-mounted equipment according to claim 1 or 3, characterized in that: The aeration device includes a plurality of aeration ports connected to external compressed air through pipelines.

5. The integrated fly ash washing skid-mounted equipment according to claim 3, characterized in that: The second agitator and the third agitator are both impeller agitators.

6. The integrated fly ash washing skid-mounted equipment according to claim 1, characterized in that: The froth scraper comprises a transmission wheel, a transmission belt and a scraper. The transmission belt realizes closed-loop transmission through the transmission wheel. The scrapers are fixed on the transmission belt vertically and sequentially at intervals. The scrapers extend 1 to 5 cm below the liquid surface.

7. The integrated fly ash washing skid-mounted equipment according to claim 1, characterized in that: The first agitator is a curved blade disc turbine agitator.

8. The integrated fly ash washing skid-mounted equipment according to claim 1, characterized in that: The tail gas outlet is provided with a tail gas collecting cover.

9. The integrated fly ash washing skid-mounted equipment according to claim 1, characterized in that: The bottom of the water tank forms an angle of 1 to 5 degrees with the horizontal plane and is inclined toward the discharge port.

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