CN112222087A - Multi-stage countercurrent cleaning device and method for waste incineration fly ash - Google Patents
Multi-stage countercurrent cleaning device and method for waste incineration fly ash Download PDFInfo
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- CN112222087A CN112222087A CN202011168167.0A CN202011168167A CN112222087A CN 112222087 A CN112222087 A CN 112222087A CN 202011168167 A CN202011168167 A CN 202011168167A CN 112222087 A CN112222087 A CN 112222087A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/102—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration with means for agitating the liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/008—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with injection or suction of gas or liquid into the cyclone
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Abstract
The invention relates to a multi-stage countercurrent cleaning device and a method for waste incineration fly ash, wherein the device comprises a stirring kettle, a horizontal centrifuge, a conductivity sensor, a liquid level meter, a flowmeter, a PLC control system and a pipeline; at least 3 stirring kettles are provided; the pipeline is arranged between the stirring kettle and the horizontal centrifuge; each stirring kettle is correspondingly provided with a horizontal centrifuge, a conductivity sensor, a liquid level meter and a flowmeter; the PLC control system is respectively and electrically connected with the conductivity sensor, the liquid level meter, the flowmeter, the horizontal centrifuge and the stirring kettle; according to the invention, the conductivity sensor is arranged in the stirring kettle, so that the conductivity of the mixture is detected, and then whether the cleaning liquid is saturated or nearly saturated is judged, the cleaning liquid can be fully utilized, and the water is saved.
Description
Technical Field
The invention relates to the field of fly ash treatment, in particular to a multi-stage countercurrent cleaning device and a method for waste incineration fly ash.
Background
With the advance of urbanization, the domestic garbage of urban residents also increases year by year, and the total amount of the municipal garbage of 1.89 hundred million tons in 2013 is increased to 2.06 hundred million tons in 2015. Because a large amount of fly ash is generated in the process of waste incineration, the fly ash contains a large amount of harmful substances, including chlorine element compounds, nitrogen element compounds, phosphorus element compounds and the like, wherein the existence of chlorine salt containing chlorine element can seriously limit the harmless treatment and resource utilization of the fly ash, and the harm of the chlorine salt is mainly represented by stronger corrosivity of the chlorine salt and can accelerate the corrosion to things around the fly ash; on the other hand, the dissolution of chloride salt in the fly ash can affect the compactness and structural strength of the fly ash product. Besides chlorine compounds, nitrogen compounds, phosphorus compounds and other harmful substances hinder the reuse of fly ash. At present, a multi-stage washing tank is adopted to wash the fly ash, and a large amount of water resources are consumed in the process of washing the fly ash; on the other hand, the residual liquid of the fly ash washing belongs to high-salinity wastewater, the pH value and the heavy metal concentration do not accord with the water quality standard of sewage discharge into urban sewers in China, and the residual liquid can be discharged after being treated. Therefore, a detection device is needed to fully utilize the washing water in the process of washing the fly ash.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a multi-stage countercurrent cleaning device and a multi-stage countercurrent cleaning method for waste incineration fly ash, which are simple in structure, convenient to use and capable of efficiently and quickly completing harmless treatment and repeated recycling of the fly ash.
A multi-stage countercurrent cleaning device for waste incineration fly ash comprises a stirring kettle, a horizontal centrifuge, a conductivity sensor, a liquid level meter, a flow meter, a PLC control system and a pipeline; at least 3 stirring kettles are provided; the pipeline is arranged between the stirring kettle and the horizontal centrifuge; each stirring kettle is correspondingly provided with a horizontal centrifuge, a conductivity sensor, a liquid level meter and a flowmeter; and the PLC control system is respectively and electrically connected with the conductivity sensor, the liquid level meter, the flowmeter, the horizontal centrifuge and the stirring kettle.
Further, a material input port, a mixture output port and a gas collection port are arranged on the shell of the stirring kettle; the material delivery outlet and the gas collecting port are arranged on the upper side of the stirring kettle shell, and the mixture delivery outlet is arranged at the bottom of the stirring kettle.
Further, a mixture output port of the stirring kettle is provided with a conductivity sensor.
Further, a filtrate output port of the horizontal centrifuge is connected with a material input port of the stirring kettle and is connected with sewage treatment equipment; and a residue output port of the horizontal centrifuge is connected with the next stirring kettle or the storage bin.
Further, the liquid level meter is arranged in the stirring kettle; the flowmeter is arranged between the filtrate output port of the horizontal centrifuge and the material input port of the stirring kettle.
A multi-stage countercurrent cleaning method for waste incineration fly ash comprises the following steps:
s1: the fly ash is added into a first stirring kettle through a pipeline and a material inlet of the stirring kettle, meanwhile, filtrate from a first horizontal centrifuge is added into the first stirring kettle, whether the mass ratio of the filtrate to the fly ash meets a set value range is judged according to the numerical value of a first flowmeter, wherein the mass ratio of the filtrate to the fly ash is 2.5-10: 1; if the mass ratio of the filtrate to the fly ash is less than a set value, adding clear water through a material input port of the stirring kettle until the mass ratio of the filtrate to the fly ash meets a set range; if the mass ratio of the filtrate to the fly ash is larger than a set value, adding the fly ash through a material input port of the stirring kettle 1 until the mass ratio of the filtrate to the fly ash meets a set range;
s2: after the material addition of the first stirring kettle is finished, recording the numerical value of the first liquid level meter, and then starting the first stirring kettle to continuously stir the first stirring kettle for 30-60min at room temperature; recording the value of the first conductivity sensor;
s3: the mixture obtained by stirring is sent to a first horizontal centrifuge by a first stirring kettle, the rotating speed of the first horizontal centrifuge is set to 2000-3000r/min, the time of the first horizontal centrifuge is set to 10-30 minutes, and the solid-liquid separation of the mixture is completed; judging the flow direction of the filtrate according to the value of the first conductivity sensor; if the value read by the first conductivity sensor is smaller than the set value, the filtrate is conveyed to the first stirring kettle again after passing through the flowmeter 5; if the value read by the first conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; the first horizontal centrifuge conveys the separated residue to a second stirring kettle through a pipeline;
s4: adding filtrate from a second horizontal centrifuge to a second stirred tank; before the system is started, adjusting the mass ratio of the filtrate to the residue in the second stirring kettle according to the reading of the second flowmeter until a set value range is met, wherein the mass ratio of the filtrate to the residue is 2.5-10: 1; then starting a second stirring kettle, and stirring the second stirring kettle at room temperature for 30-60 min; recording the value of the second conductivity sensor;
s5: sending the mixture obtained by stirring into a second horizontal centrifuge by a second stirring kettle, carrying out solid-liquid separation on the mixture by the second horizontal centrifuge, setting the rotating speed of the second horizontal centrifuge to 2000-3000r/min, and setting the time of the second horizontal centrifuge to 10-30 minutes to finish the solid-liquid separation of the mixture; judging the flow direction of the filtrate according to the value of the second conductivity sensor; if the value read by the second conductivity sensor is smaller than the set value, the filtrate is conveyed to the second stirring kettle again after passing through the flowmeter; if the value read by the second conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; the second horizontal centrifuge conveys the separated residue to a third stirring kettle through a pipeline;
s6: adding filtrate from a third horizontal centrifuge to a third stirred tank; before the system is started, adjusting the mass ratio of the filtrate to the residue in the third stirring kettle according to the reading of the third flowmeter until a set value range is met, wherein the mass ratio of the filtrate to the residue is 2.5-10: 1; then starting a third stirring kettle, and stirring the third stirring kettle at room temperature for 30-60 min; recording the value of the third conductivity sensor;
s7: sending the mixture obtained by stirring in the third stirring kettle into a third horizontal centrifuge, carrying out solid-liquid separation on the mixture by the third horizontal centrifuge, setting the rotating speed of the third horizontal centrifuge to 2000-3000r/min, and setting the time of the third horizontal centrifuge to 10-30 minutes to finish the solid-liquid separation of the mixture; judging the flow direction of the filtrate according to the numerical value of the third conductivity sensor; if the value read by the third conductivity sensor is smaller than the set value, the filtrate is conveyed to the third stirring kettle again after passing through the flowmeter; if the value read by the third conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; the third horizontal centrifuge conveys the separated residue to a storage bin through a pipeline for storage, and the fly ash cleaning process is completed;
further, the conductivity sensor in steps S3, S5, and S7 sets the value in a range of 50mS/cm to 300mS/cm at normal temperature.
The invention has the beneficial effects that:
the invention realizes the conductivity detection of the mixture by arranging the conductivity sensor in the stirring kettle, thereby realizing the on-line monitoring of the fly ash washing process and the parameter optimization of the washing process, ensuring the stability of the washing process and saving water to the maximum extent
The flowmeter is arranged between the horizontal centrifuge and the stirring kettle, so that whether the solid-liquid ratio in the stirring kettle meets the standard or not is judged, and the fly ash or the residue can be sufficiently cleaned;
by arranging a plurality of stirring kettles, the multi-stage cleaning of the fly ash is realized, the cleaning standard is met, and a large amount of harmful substances are prevented from being left in the fly ash;
through setting up the gas collection mouth, make the gas that the fly ash stirring mixing process produced in time obtain collecting the processing, can not remain in the stirred tank always.
Drawings
Fig. 1 is a connection diagram of a device according to a first embodiment of the invention.
Description of reference numerals: stirred tank 1, gas collection mouth 11, horizontal centrifuge 2, conductivity sensor 3, level gauge 4, flowmeter 5, sewage treatment device 6, storage storehouse 7.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The first embodiment is as follows:
as shown in fig. 1, a multi-stage countercurrent cleaning device for waste incineration fly ash comprises a stirring kettle 1, a horizontal centrifuge 2, a conductivity sensor 3, a liquid level meter 4, a flow meter 5, a PLC control system and a pipeline. At least 3 stirring kettles 1 are provided; the pipeline is arranged between the stirring kettle 1 and the horizontal centrifuge 2. Each stirring kettle 1 is correspondingly provided with a horizontal centrifuge 2, a conductivity sensor 3, a liquid level meter 4 and a flow meter 5; the PLC control system is respectively and electrically connected with the conductivity sensor 3, the liquid level meter 4, the flowmeter 5, the horizontal centrifuge 2 and the stirring kettle 1.
And a shell of the stirring kettle 1 is provided with a material input port, a mixture output port and a gas collection port 11. In this embodiment, the material outlet and the gas collecting port 11 are disposed on the upper side of the housing of the stirring tank 1, and the mixture outlet is disposed at the bottom of the stirring tank 1. Wherein the output port of the mixture is connected with the input port of the horizontal centrifuge 2, and the separation of the cleaning residue and the filtrate is realized through the rapid rotation of the horizontal centrifuge 2. The filtrate output port of the horizontal centrifuge 2 is also connected with the material input port of the stirring kettle 1 and the sewage treatment equipment; wherein, the stirring kettle 1 connected with the filtrate output port of the horizontal centrifuge 2 and the stirring kettle 1 connected with the input port of the horizontal centrifuge 2 are the same stirring kettle 1. The residue output port of the horizontal centrifuge 2 is connected with the next stirred tank 1 or connected with the storage bin, it should be noted that the residue output port of the last horizontal centrifuge 2 is connected with the storage bin, and the residue output ports of the other horizontal centrifuges 2 are connected with the next stirred tank 1. The mixture outlet of the stirring kettle 1 is provided with a conductivity sensor 3 which can detect the conductivity of the mixture fully mixed in the stirring kettle 1.
The liquid level meter 4 is arranged in the stirring kettle 1 and used for detecting the liquid level height in the stirring kettle 1 and ensuring that the fly ash and the liquid can be fully mixed in a set proportion.
The flowmeter 5 is arranged between the filtrate output port of the horizontal centrifuge 2 and the material input port of the stirring kettle 1. The flow meter 5 can detect the total amount of the filtrate separated by the horizontal centrifuge 2. The amount of clear water to be added can be judged in conjunction with the liquid level meter 4.
The gas collecting port 11 can collect and treat harmful gas in the fly ash stirring and mixing process.
In the implementation process, fly ash and clean water are added into a first stirring kettle 1 according to a set proportion, the mixture is stirred, mixed and detected by a conductivity sensor 3, and the mixture is introduced into a horizontal centrifuge 2; separating the residue and the filtrate in a horizontal centrifuge 2, introducing the filtrate into the stirring kettle 1 again or into sewage treatment equipment according to the conductivity of the mixture, inputting the residue into a second stirring kettle 1, and so on until the cleaning work of the fly ash is completed.
A multi-stage countercurrent cleaning method for waste incineration fly ash specifically comprises the following steps:
s1: the fly ash is added into a first stirring kettle through a pipeline and a material inlet of the stirring kettle, meanwhile, filtrate from a first horizontal centrifuge is added into the first stirring kettle, whether the mass ratio of the filtrate to the fly ash meets a set value range is judged according to the numerical value of a first flowmeter, and the mass ratio of the filtrate to the fly ash is 2.5-10: 1, selecting the mass ratio of the filtrate to the fly ash to be 6:1 in the example; if the mass ratio of the filtrate to the fly ash is less than a set value, adding clear water through a material input port of the stirring kettle until the mass ratio of the filtrate to the fly ash meets a set range; if the mass ratio of the filtrate to the fly ash is larger than a set value, adding the fly ash through a material input port of the stirring kettle 1 until the mass ratio of the filtrate to the fly ash meets a set range;
s2: after the material addition of the first stirring kettle is finished, recording the numerical value of the first liquid level meter, and then starting the first stirring kettle to continuously stir the first stirring kettle for 30-60min at room temperature, wherein 45min is selected in the example; recording the value of the first conductivity sensor;
s3: the mixture obtained by stirring is sent into a first horizontal centrifuge by a first stirring kettle, the rotating speed of the first horizontal centrifuge is set to 2000-3000r/min, the time of the first horizontal centrifuge is set to 10-30 minutes, in the example, the rotating speed of the first horizontal centrifuge is 1500r/min, the time is 20min, and the solid-liquid separation of the mixture is completed; judging the flow direction of the filtrate according to the value of the first conductivity sensor; if the value read by the first conductivity sensor is smaller than the set value, the filtrate is conveyed to the first stirring kettle again after passing through the flowmeter 5; if the value read by the first conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; the first horizontal centrifuge conveys the separated residue to a second stirring kettle through a pipeline;
s4: adding filtrate from a second horizontal centrifuge to a second stirred tank; before the system is started, adjusting the mass ratio of the filtrate to the residue in the second stirring kettle according to the reading of the second flowmeter until a set value range is met, wherein the mass ratio of the filtrate to the residue is 2.5-10: 1, in this example 6: 1; then starting a second stirring kettle, and stirring the second stirring kettle at room temperature for 30-60min, in the example, 45min is selected; recording the value of the second conductivity sensor;
s5: sending the mixture obtained by stirring in the second stirring kettle into a second horizontal centrifuge, carrying out solid-liquid separation on the mixture by the second horizontal centrifuge, setting the rotating speed of the second horizontal centrifuge to 2000-3000r/min, setting the time of the second horizontal centrifuge to 10-30 minutes, and in the example, selecting the rotating speed of the second horizontal centrifuge to be 1500r/min and the time to be 20min to finish the solid-liquid separation of the mixture; judging the flow direction of the filtrate according to the value of the second conductivity sensor; if the value read by the second conductivity sensor is smaller than the set value, the filtrate is conveyed to the second stirring kettle again after passing through the flowmeter; if the value read by the second conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; the second horizontal centrifuge conveys the separated residue to a third stirring kettle through a pipeline;
s6: adding filtrate from a third horizontal centrifuge to a third stirred tank; before the system is started, adjusting the mass ratio of the filtrate to the residue in the third stirring kettle according to the reading of the third flowmeter until a set value range is met, wherein the mass ratio of the filtrate to the residue is 2.5-10: 1, in this example 6: 1; then starting a third stirring kettle, and stirring the third stirring kettle at room temperature for 30-60min, wherein 45min is selected in the example; recording the value of the third conductivity sensor;
s7: sending the mixture obtained by stirring in the third stirring kettle into a third horizontal centrifuge, carrying out solid-liquid separation on the mixture by the third horizontal centrifuge, setting the rotating speed of the third horizontal centrifuge to 2000-3000r/min, setting the time of the third horizontal centrifuge to 10-30 minutes, selecting the rotating speed of the third horizontal centrifuge to be 1500r/min and the time to be 20min in the example, and finishing the solid-liquid separation of the mixture; judging the flow direction of the filtrate according to the numerical value of the third conductivity sensor; if the value read by the third conductivity sensor is smaller than the set value, the filtrate is conveyed to the third stirring kettle again after passing through the flowmeter; if the value read by the third conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; and the third horizontal centrifuge conveys the separated residues to a storage bin for storage through a pipeline, and the fly ash cleaning process is completed.
The conductivity sensor in the steps S3, S5, and S7 is set to a value in the range of 50mS/cm to 300mS/cm at normal temperature, in this case, to 200 mS/cm.
It should be noted that the cleaning solution in this embodiment is clear water, and in some other embodiments, the cleaning solution may also be a solution doped with a dissolving agent with a set concentration, where the dissolving agent with a set concentration may be a 10% to 30% alcohol solution, so as to be able to sufficiently dissolve the harmful substances in the fly ash. In addition, in some other embodiments, three or more stirring kettles can be adopted, and the cleaning device is formed by adopting the connection mode, so that the cleaning step of the fly ash is completed.
The above description is only one specific example of the present invention and should not be construed as limiting the invention in any way. It will be apparent to persons skilled in the relevant art(s) that, having the benefit of this disclosure and its principles, various modifications and changes in form and detail can be made without departing from the principles and structures of the invention, which are, however, encompassed by the appended claims.
Claims (7)
1. A multi-stage countercurrent cleaning device for waste incineration fly ash is characterized by comprising a stirring kettle, a horizontal centrifuge, a conductivity sensor, a liquid level meter, a flowmeter, a PLC control system and a pipeline; at least 3 stirring kettles are provided; the pipeline is arranged between the stirring kettle and the horizontal centrifuge; each stirring kettle is correspondingly provided with a horizontal centrifuge, a conductivity sensor, a liquid level meter and a flowmeter; and the PLC control system is respectively and electrically connected with the conductivity sensor, the liquid level meter, the flowmeter, the horizontal centrifuge and the stirring kettle.
2. The multi-stage countercurrent cleaning device for the fly ash generated by burning garbage according to claim 1, wherein the housing of the stirring tank is provided with a material inlet, a mixture outlet and a gas collecting port.
3. The multi-stage countercurrent washing device for the fly ash generated by burning garbage according to claim 2, wherein the mixture outlet of the stirred tank is provided with an electric conductivity sensor.
4. The multistage countercurrent cleaning device for the fly ash from waste incineration according to claim 3, wherein the filtrate output port of the horizontal centrifuge and the material input port of the stirring kettle are connected with a sewage treatment device; and a residue output port of the horizontal centrifuge is connected with the next stirring kettle or the storage bin.
5. The multi-stage countercurrent washing device for the fly ash from waste incineration as claimed in claim 4, wherein said liquid level meter is disposed in the stirring tank; the flowmeter is arranged between the filtrate output port of the horizontal centrifuge and the material input port of the stirring kettle.
6. A multi-stage countercurrent cleaning method for waste incineration fly ash is characterized by comprising the following steps:
s1: the fly ash is added into a first stirring kettle through a pipeline and a material inlet of the stirring kettle, meanwhile, filtrate from a first horizontal centrifuge is added into the first stirring kettle, whether the mass ratio of the filtrate to the fly ash meets a set value range is judged according to the numerical value of a first flowmeter, wherein the mass ratio of the filtrate to the fly ash is 2.5-10: 1; if the mass ratio of the filtrate to the fly ash is less than a set value, adding clear water through a material input port of the stirring kettle until the mass ratio of the filtrate to the fly ash meets a set range; if the mass ratio of the filtrate to the fly ash is larger than a set value, adding the fly ash through a material input port of the stirring kettle 1 until the mass ratio of the filtrate to the fly ash meets a set range;
s2: after the material addition of the first stirring kettle is finished, recording the numerical value of the first liquid level meter, and then starting the first stirring kettle to continuously stir the first stirring kettle for 30-60min at room temperature; recording the value of the first conductivity sensor;
s3: the mixture obtained by stirring is sent to a first horizontal centrifuge by a first stirring kettle, the rotating speed of the first horizontal centrifuge is set to 2000-3000r/min, the time of the first horizontal centrifuge is set to 10-30 minutes, and the solid-liquid separation of the mixture is completed; judging the flow direction of the filtrate according to the value of the first conductivity sensor; if the value read by the first conductivity sensor is smaller than the set value, the filtrate is conveyed to the first stirring kettle again after passing through the flowmeter 5; if the value read by the first conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; the first horizontal centrifuge conveys the separated residue to a second stirring kettle through a pipeline;
s4: adding filtrate from a second horizontal centrifuge to a second stirred tank; before the system is started, adjusting the mass ratio of the filtrate to the residue in the second stirring kettle according to the reading of the second flowmeter until a set value range is met, wherein the mass ratio of the filtrate to the residue is 2.5-10: 1; then starting a second stirring kettle, and stirring the second stirring kettle at room temperature for 30-60 min; recording the value of the second conductivity sensor;
s5: sending the mixture obtained by stirring into a second horizontal centrifuge by a second stirring kettle, carrying out solid-liquid separation on the mixture by the second horizontal centrifuge, setting the rotating speed of the second horizontal centrifuge to 2000-3000r/min, and setting the time of the second horizontal centrifuge to 10-30 minutes to finish the solid-liquid separation of the mixture; judging the flow direction of the filtrate according to the value of the second conductivity sensor; if the value read by the second conductivity sensor is smaller than the set value, the filtrate is conveyed to the second stirring kettle again after passing through the flowmeter; if the value read by the second conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; the second horizontal centrifuge conveys the separated residue to a third stirring kettle through a pipeline;
s6: adding filtrate from a third horizontal centrifuge to a third stirred tank; before the system is started, adjusting the mass ratio of the filtrate to the residue in the third stirring kettle according to the reading of the third flowmeter until a set value range is met, wherein the mass ratio of the filtrate to the residue is 2.5-10: 1; then starting a third stirring kettle, and stirring the third stirring kettle at room temperature for 30-60 min; recording the value of the third conductivity sensor;
s7: sending the mixture obtained by stirring in the third stirring kettle into a third horizontal centrifuge, carrying out solid-liquid separation on the mixture by the third horizontal centrifuge, setting the rotating speed of the third horizontal centrifuge to 2000-3000r/min, and setting the time of the third horizontal centrifuge to 10-30 minutes to finish the solid-liquid separation of the mixture; judging the flow direction of the filtrate according to the numerical value of the third conductivity sensor; if the value read by the third conductivity sensor is smaller than the set value, the filtrate is conveyed to the third stirring kettle again after passing through the flowmeter; if the value read by the third conductivity sensor is larger than or equal to the set value, the filtrate is sent to sewage treatment equipment through a pipeline; and the third horizontal centrifuge conveys the separated residues to a storage bin for storage through a pipeline, and the fly ash cleaning process is completed.
7. The method of claim 6, wherein the conductivity sensor set values in steps S3, S5 and S7 are in the range of 50-300 mS/cm at normal temperature.
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