CN113087346A - System and process for deep dehydration of sludge by using ultrahigh pressure squeezer - Google Patents

System and process for deep dehydration of sludge by using ultrahigh pressure squeezer Download PDF

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Publication number
CN113087346A
CN113087346A CN202110444264.6A CN202110444264A CN113087346A CN 113087346 A CN113087346 A CN 113087346A CN 202110444264 A CN202110444264 A CN 202110444264A CN 113087346 A CN113087346 A CN 113087346A
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sludge
ultra
high pressure
pressure press
feeding
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CN113087346B (en
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刘道广
刘宏健
胡军驰
孙刚范
王亚俊
杨红烈
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Shanghai Tongchen Intelligent Equipment Co.,Ltd.
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Shanghai Techase Environment Protection Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
    • B30B9/047—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
    • B30B9/06—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with permeable casings or strainers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Sludge (AREA)

Abstract

本发明公开了一种利用超高压压榨机对污泥进行深度脱水的系统及工艺。它包括依次连接的污泥池、一级污泥脱水设备、污泥调理装置、干泥输送装置、超高压压榨机和落料出泥输送装置，还包括与污泥调理装置连接的定量加药装置；在超高压压榨机的一侧即进料端设有一个进料口；在超高压压榨机的另一侧即远离进料端的顶部反吹口处设有满料测试传感器和开关阀；满料测试传感器与PLC控制系统的信号输入端连接，开关阀与PLC控制系统的信号输出端连接；污泥调理装置选用双螺杆搅拌器。本发明能够解决80％左右含水率污泥的深度脱水难题，在低成本的前提下，能使市政污泥含水率降至50％以下，便于市政污泥的无害化、减量化、稳定化、资源化处理。

Figure 202110444264

The invention discloses a system and a process for deeply dewatering sludge by utilizing an ultra-high pressure press. It includes a sludge tank, a first-stage sludge dewatering device, a sludge conditioning device, a dry sludge conveying device, an ultra-high pressure press and a blanking and sludge conveying device connected in sequence, and also includes a quantitative dosing device connected with the sludge conditioning device. There is a feeding port on one side of the ultra-high pressure press, that is, the feeding end; on the other side of the ultra-high pressure press, that is, the top blowback port away from the feeding end, there is a full material test sensor and an on-off valve; The material test sensor is connected to the signal input end of the PLC control system, the switch valve is connected to the signal output end of the PLC control system; the sludge conditioning device uses a twin-screw agitator. The invention can solve the problem of deep dewatering of sludge with a moisture content of about 80%, and under the premise of low cost, the moisture content of municipal sludge can be reduced to less than 50%, which is convenient for the harmlessness, reduction and stability of municipal sludge. processing and resource processing.

Figure 202110444264

Description

System and process for deep dehydration of sludge by using ultrahigh pressure squeezer
Technical Field
The invention belongs to the technical field of sludge treatment, and relates to a system and a process for deep dehydration of sludge by using an ultrahigh pressure squeezer, in particular to a system and a process for treating stock sludge by using a novel ultrahigh pressure squeezer. The sludge stock is mainly the sludge (the water content is usually 75% -85%) which is dehydrated once by using the conventional dehydration equipment, and the sludge is generally, but not limited to, the sludge with high organic matter content generated by municipal sewage treatment plants, water supply plants and various industrial and mining enterprises.
Background
Sludge mainly refers to a solid-liquid phase mixture generated in the sewage treatment and feedwater treatment processes, and is an inevitable byproduct of sewage treatment. The composition and properties of the sludge produced by different sewage and treatment processes vary. The sludge with high water content is very inconvenient in storage, transportation, treatment and the like, and after the sludge which is not properly treated enters the environment, the sludge contains pollutants such as malodorous substances, pathogens, persistent organic matters, heavy metals and the like, which directly bring secondary pollution to water and atmosphere and form serious threats to the ecological environment and human activities.
The key to doing well of sludge treatment and disposal is to efficiently complete sludge dehydration and drying. At present, the deep dehydration of sludge is mainly carried out by adopting a membrane filter press, and the sludge with the water content of 92-98% (2-8% solid content) is generally treated to the water content of about 60%. As most sewage treatment plants adopt conventional dewatering equipment such as a stacked screw type sludge dewatering machine, a belt filter press, a centrifugal dewatering machine and the like to treat the sludge with the water content of 97-99% (1-3% of solid content) to the water content of about 80% in the previous process. On the basis, a membrane filter press is used for secondary deep dehydration, the sludge with the water content of 80 percent must be diluted to the sludge with the water content of 92 to 95 percent (the solid content is 5 to 8 percent) to run, and the obvious redundant design on the process chain causes huge cost waste. Or the original traditional dewatering equipment is completely dismantled, and the membrane filter press is directly used for deeply dewatering the dilute sludge with the water content of 97-99% (the concentration of 1-3%), but the working efficiency of the equipment is very low, and the scale quantity of the host equipment needs to be multiplied. In recent years, manufacturers of belt filter presses have developed high-pressure belt type deep dewaterers which can directly and secondarily deeply dewater materials with water content of about 80%, but because the pressure of a high-pressure bag type filter press is limited, high-cost medicaments are often required to be added, particularly, lime, plant ash and other powder are required to be added to improve the dewatering performance of sludge, and under the conditions, the water content of the sludge is difficult to be reduced to below 60%.
An ultrahigh pressure elastic presser which is newly introduced by Shanghai Tongcheng environmental protection GmbH in recent years is a novel technology which is innovated and developed on the basis of the principle of a diaphragm filter press, adopts a pressing plate frame (patent numbers: 2014201151324 and 2016101890989) with a spring or a pressing filter plate (2017208779802 and 2017105907998) with a small oil cylinder to improve the compression ratio of sludge, greatly improves the dewatering effect by relying on higher pressing pressure (up to 2-10Mpa), and shortens the dewatering time. Currently, it works well on municipal as well as industrial projects. However, the existing operation process for deeply dehydrating sludge by using an ultrahigh pressure press is also the same as that of a membrane filter press, and sludge with the water content of 80 percent is usually diluted into a material with the water content of 92-95 percent (the solid content is 5-8 percent) and then secondarily and deeply dehydrated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a system and a process for deeply dehydrating sludge by using an ultrahigh pressure squeezer, wherein the system and the process can solve the problem of deep dehydration of sludge with water content of about 80% (75% -85%), and can reduce the water content of municipal sludge to below 50% on the premise of low cost.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a system for deeply dehydrating sludge by using an ultrahigh pressure squeezer, which comprises a sludge tank, a primary sludge dehydrating device, a sludge conditioning device, a dry sludge conveying device (a dry sludge feeding pump), the ultrahigh pressure squeezer, a blanking and sludge discharging conveying device and a quantitative dosing device connected with a feeding port of the sludge conditioning device, wherein the sludge tank, the primary sludge dehydrating device, the sludge conditioning device, the dry sludge conveying device (the dry sludge feeding pump), the ultrahigh pressure squeezer and the blanking and sludge discharging conveying device are sequentially; a feeding hole is formed in one side, namely a feeding end, of the ultrahigh pressure squeezer; a back flushing port is arranged at the other side of the ultrahigh pressure squeezer, namely the top far away from the feeding end, and a full material test sensor and a switch valve are arranged at the back flushing port; the full material test sensor is connected with the signal input end of the PLC control system, and the switch valve is connected with the signal output end of the PLC control system.
Furthermore, a tee joint is arranged on a pipeline for connecting a back flushing port of the ultrahigh pressure squeezer with the gas storage tank to divide the pipeline into two branches, one branch is connected with the gas storage tank, the other branch is directly communicated with the atmosphere, and each branch is provided with a switch valve; and a branch communicated with the atmosphere is provided with a full material test sensor.
Furthermore, one side of the ultrahigh pressure squeezer, namely the feeding end, is provided with one feeding hole, the other side of the ultrahigh pressure squeezer, namely the side far away from the feeding end, is provided with the other feeding hole, and the two feeding holes are both connected with an outlet of a dry mud conveying device (a dry mud feeding pump); the back flushing port of the ultrahigh pressure squeezer is arranged in the middle of the squeezer. The ultrahigh pressure squeezer is additionally provided with the feeding hole, so that double-end feeding is formed, and the pressure difference between plates can be reduced due to the two feeding holes.
Furthermore, the quantitative dosing device is provided with a long dosing pipe, the dosing pipe is provided with a plurality of spray heads, and the sludge conditioning device can be subjected to multi-point spray dosing, so that the agent and the sludge are conditioned and mixed more uniformly.
Further, the sludge conditioning device adopts a double-screw stirrer. The primary sludge dewatering equipment is a stacked screw type sludge dewatering machine, a belt type filter press, a centrifugal machine or other common dewatering equipment.
Further, the dry mud conveying device (dry mud feeding pump) is a dry mud screw pump or a high-pressure plunger pump. The ultrahigh pressure squeezer is a YG type ultrahigh pressure squeezer.
The invention relates to a process for deeply dehydrating sludge by using an ultrahigh pressure squeezer, which comprises the following steps:
(1) a sludge conditioning device is arranged at the rear end of a sludge discharge port of the primary sludge dewatering equipment, a quantitative dosing device is installed at a feeding port of the sludge conditioning device, a conditioning agent is dosed quantitatively, the sludge and the agent are fully conditioned by the sludge conditioning device, and the fluidity and the dewatering property of the sludge are enhanced; the primary sludge dewatering equipment can be a stacked screw type sludge dewatering machine, a belt type filter press, a centrifugal machine and other common dewatering equipment.
(2) And a dry sludge conveying device (a dry sludge feeding pump) is designed and arranged at a discharge port of the sludge conditioning device, and the conditioned sludge is conveyed to the ultrahigh pressure squeezer. The dry mud feeding pump is preferably a screw type dry mud cake pump, and can also be a high-pressure plunger pump. The dry mud feeding pump is preferably provided with a frequency converter according to the requirement of conveying materials, and the mud feeding pressure and flow are adjusted; the mud feeding pressure is adjusted within the range of 0-1.5 MPa.
(3) On the basis of the structure of the original ultrahigh pressure squeezer, a feed inlet is additionally arranged at the position, far away from a back flushing port at a feed end, of the top of the ultrahigh pressure squeezer, so that double-end feeding is formed, and two feed inlets are arranged to reduce the pressure difference between plates; arranging a full material test sensor and a switch valve near a back flushing port at the top of the ultrahigh pressure squeezer far away from a feeding end (arranging the full material test sensor on a branch communicated with the atmosphere near the back flushing port of the ultrahigh pressure squeezer); the full material testing sensor is connected with a signal input end of the PLC control system, and the switch valve is connected with a signal output end of the PLC control system; the full material testing sensor monitors whether sludge appears or not, transmits a signal to the PLC control system, transmits a signal to the switch valve through the PLC control system, and closes the switch valve when sludge appears; when no sludge appears, opening a valve of the switch valve; and the pump is stopped in time when the sludge is just filled.
(4) A blanking and mud-discharging conveying device (a screw conveyor or a belt conveyor) is designed and arranged below the ultrahigh pressure squeezer, and dry mud cakes (low-water-content sludge with the water content of below 50%) processed by the ultrahigh pressure squeezer are conveyed out.
Furthermore, a pipeline for connecting a back flushing port of the ultrahigh pressure squeezer with the gas storage tank is divided into two branches by a tee joint, one branch is connected with the gas storage tank, the other branch is directly communicated with the atmosphere, and each branch is provided with a switch valve; a branch communicated with the atmosphere is provided with a full material test sensor; the switch valve on the branch connected with the gas storage tank is in a normally closed state, and the switch valve on the branch communicated with the atmosphere and provided with the full material test sensor is in a normally open state. When the full material test sensor senses sludge, a switch valve on a branch communicated with the atmosphere and provided with the full material test sensor is closed, a signal is transmitted to a PLC control system, a sludge inlet pump is controlled to be closed, a sludge inlet valve is controlled to be closed, and then squeezing dehydration is started; squeezing finishes, two ooff valves are opened simultaneously in PLC control system control, begin the blowback, blow clean earlier and the atmosphere communicates with each other and is equipped with the mud on the branch road of full material test sensor, then, full material test sensor transmission signal to PLC control system, the ooff valve on PLC control system control and the gas tank connection branch road is closed, continue the mud between the blowback squeezer plate frame, the blowback finishes, PLC control system control close with the gas tank connection branch road on the ooff valve, begin the plate frame and unload mud.
Further, the mode of adding the conditioning agent into the sludge conditioning device by the quantitative dosing device is a multi-point spraying mode. The sludge conditioning device preferably adopts a double-screw stirring structure form.
Furthermore, the dry mud conveying device (dry mud feeding pump) is a dry mud screw pump or a high-pressure plunger pump.
Further, the blanking and mud discharging conveying device is a spiral conveyor or a belt conveyor.
The invention has the beneficial effects that:
the novel process for deeply dehydrating the sludge by using the ultrahigh pressure squeezer can solve the problem of deep dehydration of the sludge with the water content of about 80 percent (75-85 percent), can reduce the water content of the municipal sludge to below 50 percent on the premise of low cost, and is convenient for harmless, quantitative-reduction, stabilization and recycling treatment of the municipal sludge.
According to the invention, through technical innovation, the existing structure of the ultrahigh-pressure elastic squeezer is optimized, and a new sludge conveying and conditioning mode is combined, so that the deep dehydration of the sludge with the water content of about 80% (75% -85%) is realized, the dehydration efficiency is greatly improved, and the water content of the dehydrated sludge can be reduced to 50% or even lower. The method is a new technical breakthrough in the field of deep sludge removal and is worth of popularization and application.
Compared with the prior art, the novel process for deeply dehydrating the sludge by using the ultrahigh pressure squeezer has the following advantages:
1. the invention is suitable for treating municipal sludge with water content of 75-85% and high organic matter sludge similar to the municipal sludge, and has simple process and low cost.
2. The ultrahigh-pressure elastic squeezer adopted by the invention has good structural strength and reasonable feeding structural design, can adapt to feeding impact of the viscous material with 80% of water content, and reduces pressure difference between plates during feeding; meanwhile, the pressure difference between plates caused by misoperation or sudden change of material properties exceeds the standard and has super-strong bearing capacity, so that the safety of equipment is ensured.
3. The ultrahigh-pressure elastic squeezer adopted by the invention is provided with the full material testing sensor and the switch valve, so that feeding can be quickly stopped at the moment of full material, and the condition that the pressure of a plate frame chamber is suddenly increased is avoided.
4. The YG type ultrahigh pressure squeezer has the unique functions of squeezing and dewatering municipal sludge with the water content of 75-85% until the water content is reduced to about 45%;
5. the invention utilizes the conventional conditioning agents such as polyferric chloride, collective aluminum chloride, polyacrylamide and the like for conditioning, has less sludge capacity increase, low conditioning cost and good process universality.
Drawings
FIG. 1 is a process flow diagram of a novel process for deep dewatering of sludge using an ultra-high pressure press according to the present invention;
FIG. 2 is a schematic front view of the dry sludge delivery apparatus 4 of the present invention;
FIG. 3 is a schematic front view of the sludge conditioning apparatus 3 according to the present invention;
FIG. 4 is a schematic front view of the quantitative medicine adding device 7 of the present invention;
fig. 5 is a schematic front view of the ultra-high pressure press 5 according to the present invention;
fig. 6 is a partially enlarged view of fig. 5 at the blowback port 11;
fig. 7 is a schematic top view of the ultra-high pressure press 5 of the present invention;
fig. 8 is a schematic front view of the blanking and discharging conveying device 6 in the invention.
In the figure: 1. a sludge pool 2, a primary sludge dewatering device 3, a sludge conditioning device 4, a dry sludge conveying device 5, an ultrahigh pressure squeezer 6, a blanking sludge outlet conveying device 7, a quantitative dosing device 8, a full material testing sensor 9, a switch valve 10, a feeding hole 11, a back flushing hole 12, a back flushing return pipeline 71, a dosing pipe 72 and an atomizing spray head
Detailed Description
The invention is further described below with reference to the following figures and examples.
Example 1
As shown in fig. 1-8, the treatment system for deep dehydration of sludge by using an ultrahigh pressure squeezer comprises a sludge tank 1, a primary sludge dehydration device 2, a sludge conditioning device 3, a dry sludge conveying device 4 (dry sludge feeding pump), an ultrahigh pressure squeezer 5, a blanking and sludge discharging conveying device 6, and a quantitative dosing device 7 connected with a feeding port of the sludge conditioning device 3, which are connected in sequence; a feed inlet 10 is arranged at one side, namely the feed end, of the ultrahigh pressure squeezer 5, and a back-blowing return pipeline 12 is arranged above the feed inlet 10; a back flushing port 11 is arranged at the other side of the ultrahigh pressure squeezer 5, namely the top far away from the feeding end, and a full material testing sensor 8 and a switch valve 9 are arranged at the back flushing port 11; the full material testing sensor 8 is connected with a signal input end of the PLC control system, and the switch valve 9 is connected with a signal output end of the PLC control system; the sludge conditioning device 3 adopts a double-screw stirrer.
As shown in fig. 5 and 6, a three-way pipe is arranged on a pipeline connecting a back flushing port of the ultrahigh pressure squeezer 5 with the gas storage tank, and is divided into two branches, wherein one branch is connected with the gas storage tank, and the other branch is directly communicated with the atmosphere, and each branch is provided with a switch valve 9; and a branch communicated with the atmosphere is provided with a full material test sensor 8.
As shown in fig. 4, the quantitative medicine adding device 7 is provided with a long medicine adding pipe 71, and the medicine adding pipe 71 is provided with a plurality of spray heads 72, so that the sludge conditioning device 3 can be added with medicine in a multi-point spray manner, and the medicine and the sludge are conditioned and mixed more uniformly.
The primary sludge dewatering equipment 2 is a stacked screw type sludge dewatering machine. The dry mud conveying device 4 (dry mud feeding pump) is a dry mud screw pump. The blanking and mud-discharging conveying device 6 is a screw conveyor. The ultrahigh pressure squeezer 5 is a small YG type ultrahigh pressure squeezer produced by Shanghai Tongchen environmental protection GmbH.
In this embodiment, since a branch is arranged at the back-blowing port 11 of the ultra-high pressure squeezer and directly communicated with the atmosphere, and the other end of the sludge inlet (i.e. the discharge end has no pressure), the fluidity of the sludge is enhanced, and thus the pressure difference between the plate frames can be reduced.
As shown in fig. 1, the invention relates to a new process for deep dewatering of sludge by using an ultrahigh pressure press, which comprises the following steps:
(1) a sludge conditioning device is arranged at the rear end of a sludge discharge port of the primary sludge dewatering equipment, a quantitative dosing device is installed at a feeding port of the sludge conditioning device, a conditioning agent is dosed quantitatively, the sludge and the agent are fully conditioned by the sludge conditioning device, and the fluidity and the dewatering property of the sludge are enhanced; the primary sludge dewatering equipment is a stacked screw type sludge dewatering machine. The sludge conditioning device adopts a double-screw stirring structure form. The medicament adding mode is designed to be a multi-point spraying mode.
(2) And a dry sludge feeding pump is designed and arranged at a discharge port of the sludge conditioning device, and the conditioned sludge is conveyed to the ultrahigh pressure squeezer. The dry mud feeding pump adopts a dry mud screw pump. A frequency converter is configured on the dry mud feeding pump according to the requirement of conveying materials, and the mud feeding pressure and flow are adjusted; the mud feeding pressure is adjusted within the range of 0-1.5 MPa.
(3) On the basis of the structure of the original ultrahigh pressure squeezer, the pipe diameter of a sludge feeding hole is enlarged from the original 150mm to 220mm, so that the feeding pressure can be reduced; arranging a full material testing sensor and a switch valve near a back flushing port at the top of the ultrahigh pressure squeezer far away from a feeding end; the full material testing sensor is connected with a signal input end of the PLC control system, and the switch valve is connected with a signal output end of the PLC control system; the full material testing sensor monitors whether sludge appears or not, transmits a signal to the PLC control system, transmits a signal to the switch valve through the PLC control system, and closes the switch valve when sludge appears; when no sludge appears, opening a valve of the switch valve; and the pump is stopped in time when the sludge is just filled.
The method specifically comprises the following steps: a pipeline for connecting a back flushing port of the ultrahigh pressure squeezer with the gas storage tank is divided into two branches by a tee joint, one branch is connected with the gas storage tank, the other branch is directly communicated with the atmosphere, and each branch is provided with a switch valve; the branch communicated with the atmosphere is provided with a full material test sensor, namely, the branch communicated with the atmosphere and near a back blowing port of the ultrahigh pressure squeezer is provided with the full material test sensor; the two switch valves are not opened at the same time and are closed at the same time; in the conventional situation, a switch valve on a branch connected with the gas storage tank is in a normally closed state, and a switch valve on a branch communicated with the atmosphere and provided with a full material test sensor is in a normally open state; when the full material test sensor senses sludge, a switch valve on a branch communicated with the atmosphere and provided with the full material test sensor is closed, a signal is transmitted to a PLC control system, a sludge inlet pump is controlled to be closed, a sludge inlet valve is closed, and then squeezing dehydration is started; squeezing finishes, two ooff valves are opened simultaneously in PLC control system control, begin the blowback, blow clean earlier and the atmosphere communicates with each other and is equipped with the mud on the branch road of full material test sensor, then, full material test sensor transmission signal to PLC control system, the ooff valve on PLC control system control and the gas tank connection branch road is closed, continue the mud between the blowback squeezer plate frame, the blowback finishes, PLC control system control close with the gas tank connection branch road on the ooff valve, begin the plate frame and unload mud.
(4) A blanking and mud discharging conveying device (a screw conveyor) is designed and arranged below the YG type ultrahigh pressure squeezer, and low-moisture-content sludge (dry mud cakes with the moisture content reduced to below 50%) treated by the ultrahigh pressure squeezer is conveyed out.
Example 2
As shown in fig. 1, the treatment system for deeply dehydrating sludge by using an ultrahigh pressure squeezer comprises a sludge tank 1, a primary sludge dehydrating device 2, a sludge conditioning device 3, a dry sludge conveying device 4 (dry sludge feeding pump), an ultrahigh pressure squeezer 5, a blanking and sludge discharging conveying device 6, and a quantitative dosing device 7 connected with a feeding port of the sludge conditioning device 3, wherein the sludge tank, the primary sludge dehydrating device, the sludge conditioning device 3, the dry sludge conveying device 4 (dry sludge feeding pump), the ultrahigh pressure squeezer 5 and the blanking and sludge discharging conveying device 6 are sequentially connected; a feeding port 10 is arranged at one side, namely a feeding end, of the ultrahigh pressure squeezer 5, another feeding port is arranged at the other side, namely a side far away from the feeding end, of the ultrahigh pressure squeezer 5, and the two feeding ports are both connected with an outlet of the dry mud conveying device 4 (a dry mud feeding pump); a back flushing port of the ultrahigh pressure squeezer 5 is arranged in the middle of the ultrahigh pressure squeezer 5; a full material testing sensor 8 and a switch valve 9 are arranged at a back flushing port of the ultrahigh pressure squeezer 5; the full material testing sensor 8 is connected with a signal input end of the PLC control system, and the switch valve 9 is connected with a signal output end of the PLC control system; a tee joint is arranged on a pipeline for connecting a back flushing port of the ultrahigh pressure squeezer 5 with the gas storage tank to be divided into two branches, one branch is connected with the gas storage tank, the other branch is directly communicated with the atmosphere, and each branch is provided with a switch valve 9; and a branch communicated with the atmosphere is provided with a full material test sensor 8.
As shown in fig. 4, the quantitative medicine adding device 7 is provided with a long medicine adding pipe 71, and the medicine adding pipe 71 is provided with a plurality of spray heads 72, so that the sludge conditioning device 3 can be added with medicine in a multi-point spray manner, and the medicine and the sludge are conditioned and mixed more uniformly. The sludge conditioning device 3 adopts a double-screw stirrer. The primary sludge dewatering equipment 2 is a belt filter press. The dry sludge conveying device 4 (dry sludge feeding pump) is a high-pressure plunger pump. The blanking and mud-discharging conveying device 6 is a belt conveyor.
The ultrahigh pressure squeezer 5 is a large YG type ultrahigh pressure squeezer produced by Shanghai Tongchen environmental protection GmbH. This large-scale YG type superhigh pressure squeezer increases the little hydro-cylinder of secondary expression between the sheet frame, provides bigger sealing force for between sheet frame and the sheet frame, makes the feeding even, has reduced the pressure differential between the sheet frame.
In this embodiment, since a branch is arranged at the blowback port of the ultrahigh pressure squeezer and directly communicated with the atmosphere, and the other end of the sludge inlet (i.e. the discharge end has no pressure), the fluidity of the sludge is enhanced, and thus the pressure difference between the plate frames can be reduced.
The superhigh pressure squeezer is equipped with two feed inlets in this embodiment, forms the bi-polar feeding, can reduce the pressure difference between the board.
As shown in fig. 1, the invention relates to a new process for deep dewatering of sludge by using an ultrahigh pressure press, which comprises the following steps:
(1) a sludge conditioning device is arranged at the rear end of a sludge discharge port of the primary sludge dewatering equipment, a quantitative dosing device is installed at a feeding port of the sludge conditioning device, a conditioning agent is dosed quantitatively, the sludge and the agent are fully conditioned by the sludge conditioning device, and the fluidity and the dewatering property of the sludge are enhanced; the primary sludge dewatering equipment is a stacked screw type sludge dewatering machine. The sludge conditioning device adopts a double-screw stirring structure form. The medicament adding mode is designed to be a multi-point spraying mode.
(2) And a dry sludge feeding pump is designed and arranged at a discharge port of the sludge conditioning device, and the conditioned sludge is conveyed to the ultrahigh pressure squeezer. The dry mud feeding pump is a high-pressure plunger pump. A frequency converter is configured on the dry mud feeding pump according to the requirement of conveying materials, and the mud feeding pressure and flow are adjusted; the mud feeding pressure is adjusted within the range of 0-1.5 MPa.
(3) Arranging a full material testing sensor and a switch valve near a back flushing port positioned in the middle of the top of the ultrahigh pressure squeezer; the full material testing sensor is connected with a signal input end of the PLC control system, and the switch valve is connected with a signal output end of the PLC control system; the full material testing sensor monitors whether sludge appears or not, transmits a signal to the PLC control system, transmits a signal to the switch valve through the PLC control system, and closes the switch valve when sludge appears; when no sludge appears, opening a valve of the switch valve; and the pump is stopped in time when the sludge is just filled.
The method specifically comprises the following steps: a pipeline for connecting a back flushing port of the ultrahigh pressure squeezer with the gas storage tank is divided into two branches by a tee joint, one branch is connected with the gas storage tank, the other branch is directly communicated with the atmosphere, and each branch is provided with a switch valve; the branch communicated with the atmosphere is provided with a full material test sensor, namely, the branch communicated with the atmosphere and near a back blowing port of the ultrahigh pressure squeezer is provided with the full material test sensor; the two switch valves are not opened at the same time and are closed at the same time; in the conventional situation, a switch valve on a branch connected with the gas storage tank is in a normally closed state, and a switch valve on a branch communicated with the atmosphere and provided with a full material test sensor is in a normally open state; when the full material test sensor senses sludge, a switch valve on a branch communicated with the atmosphere and provided with the full material test sensor is closed, a signal is transmitted to a PLC control system, a sludge inlet pump is controlled to be closed, a sludge inlet valve is closed, and then squeezing dehydration is started; squeezing finishes, two ooff valves are opened simultaneously in PLC control system control, begin the blowback, blow clean earlier and the atmosphere communicates with each other and is equipped with the mud on the branch road of full material test sensor, then, full material test sensor transmission signal to PLC control system, the ooff valve on PLC control system control and the gas tank connection branch road is closed, continue the mud between the blowback squeezer plate frame, the blowback finishes, PLC control system control close with the gas tank connection branch road on the ooff valve, begin the plate frame and unload mud.
(4) A blanking and mud discharging conveying device (belt conveyor) is designed and arranged below the YG type ultrahigh pressure squeezer, and low-moisture-content sludge (dry mud cakes, the moisture content of which is reduced to below 50%) treated by the ultrahigh pressure squeezer is conveyed out.

Claims (10)

1.一种利用超高压压榨机对污泥进行深度脱水的系统，其特征在于，包括依次连接的污泥池、一级污泥脱水设备、污泥调理装置、干泥输送装置、超高压压榨机和落料出泥输送装置，还包括与污泥调理装置的入料口连接的定量加药装置；所述干泥输送装置为干泥进料泵；在超高压压榨机的一侧即进料端设有一个进料口；在超高压压榨机的另一侧即远离进料端的顶部设有反吹口，反吹口处设有满料测试传感器和开关阀；满料测试传感器与PLC控制系统的信号输入端连接，开关阀与PLC控制系统的信号输出端连接。1. a system utilizing an ultra-high pressure press to carry out deep dewatering of sludge, is characterized in that, comprising successively connected sludge ponds, primary sludge dewatering equipment, sludge conditioning device, dry mud conveying device, ultra-high pressure pressing It also includes a quantitative dosing device connected to the feeding port of the sludge conditioning device; the dry mud conveying device is a dry mud feeding pump; There is a feeding port at the material end; there is a back blowing port on the other side of the ultra-high pressure press, that is, the top away from the feeding end, and the back blowing port is provided with a full material test sensor and an on-off valve; full material test sensor and PLC control system The signal input end of the switch valve is connected to the signal output end of the PLC control system. 2.如权利要求1所述的利用超高压压榨机对污泥进行深度脱水的系统，其特征在于，在超高压压榨机的反吹口连接储气罐的管路上，设有一个三通分成两个支路，一个支路与储气罐连接，一个支路直接与大气相通，每个支路上都有一个开关阀；与大气相通的支路上设有满料测试传感器。2. the system that utilizes ultra-high pressure press to carry out deep dewatering to sludge as claimed in claim 1, it is characterized in that, on the pipeline that the blowback port of ultra-high pressure press is connected to the air storage tank, is provided with a tee and is divided into two parts. There are two branches, one branch is connected to the gas storage tank, the other is directly connected to the atmosphere, and each branch has an on-off valve; the branch connected to the atmosphere is provided with a full material test sensor. 3.如权利要求1所述的利用超高压压榨机对污泥进行深度脱水的系统，其特征在于，在超高压压榨机的一侧即进料端设有一个进料口，在超高压压榨机的另一侧即远离进料端设有另一个进料口，两个进料口均与干泥进料泵出口连接；超高压压榨机的反吹口设在压榨机的中间位置。3. the system that utilizes ultra-high pressure press to carry out deep dehydration to sludge as claimed in claim 1, it is characterized in that, one side of ultra-high pressure press, namely feed end, is provided with a feed port, and in ultra-high pressure press The other side of the machine, that is, away from the feed end, is provided with another feed port, both of which are connected to the outlet of the dry mud feed pump; the back blow port of the ultra-high pressure press is located in the middle of the press. 4.如权利要求1、2或3所述的利用超高压压榨机对污泥进行深度脱水的系统，其特征在于，所述定量加药装置带有长加药管，加药管上设有多个喷雾头。4. The system for deep dewatering of sludge using an ultra-high pressure press according to claim 1, 2 or 3, wherein the quantitative dosing device is provided with a long dosing pipe, and the dosing pipe is provided with Multiple spray heads. 5.如权利要求1、2或3所述的利用超高压压榨机对污泥进行深度脱水的系统，其特征在于，污泥调理装置选用双螺杆搅拌器；所述一级污泥脱水设备是叠螺式污泥脱水机、带式压滤机或离心机。5. The system according to claim 1, 2 or 3 for deep dewatering of sludge by means of an ultra-high pressure press, wherein the sludge conditioning device selects a twin-screw agitator; the first-stage sludge dewatering equipment is a Stacked screw sludge dewatering machines, belt filter presses or centrifuges. 6.如权利要求1、2或3所述的利用超高压压榨机对污泥进行深度脱水的系统，其特征在于，所述干泥进料泵为干泥螺杆泵或高压柱塞泵；所述超高压压榨机为YG型超高压压榨机。6. The system according to claim 1, 2 or 3, characterized in that the dry mud feed pump is a dry mud screw pump or a high pressure plunger pump; The ultra-high pressure press is a YG type ultra-high pressure press. 7.一种利用如权利要求1或2所述的系统对污泥进行深度脱水的工艺，其特征在于，7. A process for deeply dewatering sludge by utilizing the system according to claim 1 or 2, characterized in that, (1)在一级污泥脱水设备的污泥出料口后端设置污泥调理装置，并在污泥调理装置的入料口安装定量加药装置，定量投加调理药剂，利用污泥调理装置将污泥与药剂进行充分调理，增强污泥的流动性及脱水性；(1) A sludge conditioning device is installed at the back end of the sludge discharge port of the primary sludge dewatering equipment, and a quantitative dosing device is installed at the feeding port of the sludge conditioning device to quantitatively add conditioning agents and use sludge conditioning The device fully adjusts the sludge and chemicals to enhance the fluidity and dehydration of the sludge; (2)在污泥调理装置的出料口设置干泥进料泵，将调理后的污泥输送至超高压压榨机；干泥进料泵配置变频器，进泥压力在0-1.5Mpa区间可调；(2) A dry mud feeding pump is set at the discharge port of the sludge conditioning device to transport the conditioned sludge to the ultra-high pressure press; the dry mud feeding pump is equipped with a frequency converter, and the mud feeding pressure is in the range of 0-1.5Mpa adjustable; (3)在超高压压榨机顶部远离进料端的反吹口附近设置满料测试传感器和开关阀；满料测试传感器与PLC控制系统的信号输入端连接，开关阀与PLC控制系统的信号输出端连接；满料测试传感器监测有无污泥出现，并传输信号到PLC控制系统，再经PLC控制系统传输信号到开关阀，有污泥出现，开关阀阀门关闭；没有污泥出现，开关阀阀门打开；确保污泥在刚充满时及时停泵；(3) Set the full material test sensor and switch valve near the back blowing port at the top of the ultra-high pressure press away from the feed end; the full material test sensor is connected to the signal input end of the PLC control system, and the switch valve is connected to the signal output end of the PLC control system. ;The full material test sensor monitors the presence of sludge, and transmits the signal to the PLC control system, and then transmits the signal to the switch valve through the PLC control system. If sludge occurs, the switch valve valve is closed; if there is no sludge, the switch valve valve is opened. ; Ensure that the pump is stopped in time when the sludge is just full; (4)在超高压压榨机的下方设计配置落料出泥输送装置，将超高压压榨机处理后的含水率为50％以下的干泥饼运出。(4) Design and configure a blanking and sludge conveying device below the ultra-high pressure press, and transport out the dry mud cake with a moisture content of less than 50% after the ultra-high pressure press. 8.如权利要求7所述的工艺，其特征在于，在超高压压榨机反吹口连接储气罐的管路上，由一个三通分成两个支路，一个支路与储气罐连接，一个支路直接与大气相通，每个支路上都有一个开关阀；与大气相通的支路上设有满料测试传感器；与储气罐连接支路上的开关阀为常闭状态，与大气相通设满料测试传感器的支路上的开关阀为常开状态。8. technology as claimed in claim 7 is characterized in that, on the pipeline connecting the gas storage tank at the back blow port of the ultra-high pressure press, it is divided into two branches by a tee, one branch is connected with the gas storage tank, and one is divided into two branches. The branch is directly connected to the atmosphere, and each branch has an on-off valve; the branch connected to the atmosphere is provided with a full material test sensor; the on-off valve on the branch connected to the gas storage tank is normally closed, and the branch connected to the atmosphere is full The switch valve on the branch of the material test sensor is normally open. 9.如权利要求7所述的工艺，其特征在于，在超高压压榨机一侧即进料端设有一个进料口的基础上，在超高压压榨机另一侧即远离进料端增设另一个进料口；两个进料口均与干泥进料泵出口连接；超高压压榨机的反吹口设在压榨机的中间位置。9. technology as claimed in claim 7 is characterized in that, on the basis that one side of the ultra-high pressure press, namely the feed end is provided with a feed port, the other side of the ultra-high pressure press, namely away from the feed end, is added Another feeding port; both feeding ports are connected with the outlet of the dry mud feeding pump; the back blowing port of the ultra-high pressure press is located in the middle of the press. 10.如权利要求7所述的工艺，其特征在于，污泥调理装置选用双螺杆搅拌器；定量加药装置将调理药剂定量投加到污泥调理装置的药剂投加方式为多点喷雾式；所述干泥进料泵选用干泥螺杆泵或高压柱塞泵；所述落料出泥输送装置为螺旋输送机或者皮带机。10. The process according to claim 7, characterized in that, the sludge conditioning device selects a twin-screw agitator; the dosing method for quantitatively adding conditioning agents to the sludge conditioning device by the quantitative dosing device is a multi-point spray type ; The dry mud feeding pump is a dry mud screw pump or a high-pressure plunger pump; the blanking and discharging mud conveying device is a screw conveyor or a belt conveyor.
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