CN206570192U - Sludge dewatering and drying device - Google Patents

Abstract

The utility model relates to a sludge dewatering and drying device. The sludge dewatering and drying device comprises a sludge squeezing and dewatering unit, a conveying unit, a sludge crushing and drying unit and a collecting unit. The conveying unit is arranged between the sludge squeezing and dewatering unit and the sludge crushing and drying unit, and the conveying unit transports the sludge treated by the sludge squeezing and dewatering unit to the sludge crushing and drying unit; the feed port of the collecting unit is connected with the discharge port of the sludge crushing and drying unit. The sludge dewatering and drying device of the utility model has wide adaptability, can realize continuous flocculation concentration, spiral squeezing and dewatering and crushing and drying, has a short sludge treatment process, less equipment, less engineering investment, and low operating cost, can reduce the sludge moisture content from 98~99wt.% to 20~30wt.%, and the sludge volume is reduced exponentially, which has great promotion and application value in the field of sludge treatment.

Description

A sludge dehydration and drying device

technical field

The utility model belongs to the field of sludge treatment, in particular to a sludge dewatering and drying device.

Background technique

With the rapid development of my country's economy and urbanization, the problem of water pollution has become increasingly prominent, and the amount of sewage discharge has shown a trend of rapid increase. According to incomplete statistics, during the 14 years from 1990 to 2003, China's urban sewage discharge increased by 10 billion m ³ , and in 2003 it was 46 billion m ³ ; The volume increased to 125 billion m ³ , an increase of 79 billion m ³ . By the end of 2014, the treatment capacity of urban domestic sewage facilities in China reached 150 million m ³ /d, and the sewage treatment rate reached 80wt.%. With the advancement of energy saving and emission reduction goals in the "Twelfth Five-Year Plan", my country's standards for effluent water quality of urban sewage treatment plants have been continuously improved. For key watersheds and closed or semi-enclosed waters such as lakes and reservoirs, the Class A standard shall be implemented. Although the urban sewage treatment plants built in the early stage have a good effect on removing organic matter and suspended solids, the removal effect on nitrogen and phosphorus is not obvious, and has not reached the current discharge standards for urban sewage in my country. Based on the traditional activated sludge method The urban sewage treatment plants invested in the early stage of the main treatment process are forced by policy and environmental pressure, and it is imperative to upgrade the sewage treatment plants. Therefore, the rapid development of China's sewage treatment industry is also facing many problems and challenges, which are mainly reflected in the following three aspects: (1) lack of construction funds, the construction of sewage treatment plants requires a lot of capital investment, and the lack of funds has become a limitation A major obstacle to sewage treatment; (2) The high operating costs of sewage treatment plants have resulted in a lot of equipment in sewage treatment plants becoming decorations; (3) The concentration of settled sludge is not only low, only 1~2wt.%, but also difficult to dehydrate, therefore, The dehydration process requires a lot of dehydration equipment, which not only requires a large investment in equipment, but also occupies land. In addition, the sludge after dehydration has a high water content, reaching 75-80wt.%, and the sludge volume is large, with an annual sludge generation of 30 million tons. For the above, a large amount of land needs to be occupied for landfill, and the sludge contains harmful bacteria, which will cause secondary pollution after landfill. The underground pollution caused by this kind of landfill is difficult to repair, and the sludge needs to be further dried. Sludge treatment equipment generally only has the function of dehydration or drying, and cannot realize continuous or deep dehydration and drying treatment of sludge in one set of equipment. It requires a lot of manpower and material resources, and the cost of sludge treatment is high.

Utility model content

The purpose of this utility model is to provide a sludge treatment device that can continuously dehydrate and dry sludge in order to improve the dehydration and drying efficiency and dehydration depth of sludge, reduce the investment in dehydration equipment and reduce equipment. Covering an area and improving the sludge treatment efficiency.

The technical solution of the utility model is: a sludge dewatering and drying device, including a sludge press dewatering unit, a conveying unit, a sludge crushing and drying unit, and a collection unit. The conveying unit is arranged between the sludge press dewatering unit and the sludge Between the crushing and drying units, the conveying unit transports the sludge treated by the sludge pressing and dewatering unit to the sludge crushing and drying unit; the inlet of the collection unit communicates with the outlet of the sludge crushing and drying unit.

With such a structural design, the sludge is first dehydrated by the sludge pressing and dewatering unit to obtain sludge with a high solid content, and then sent to the sludge crushing and drying unit through the conveying unit, and further crushed under the action of the sludge crushing and drying unit , dry, turn into dust, and collect in the collection unit, through the synergistic effect of the sludge pressing and dewatering unit and the sludge crushing and drying unit, the sludge is continuously double-dried, and finally the sludge with low water content is obtained.

Further, the sludge press dewatering unit includes a sludge pump and a screw press dewaterer, and the screw press dewaterer is provided with a feed port, a drainage port and a discharge port, and the screw press dewaterer is provided with a variable pitch A screw extruding mechanism, the variable-pitch screw extruding mechanism is covered with a filter, the outlet end of the sludge pump communicates with the feed port, and the discharge port communicates with the conveying unit.

Further, the conveying unit is a screw conveyor.

Further, the sludge crushing and drying unit includes a sludge crushing and drying tank, the inner bottom of the sludge crushing and drying tank is provided with a crushing mechanism, the bottom of the sludge crushing and drying tank is provided with a flue gas inlet, and the sludge The side wall of the sludge crushing and drying tank is provided with a feeding port, which is connected to the outlet of the screw conveyor; the top of the sludge crushing and drying tank is provided with a dust outlet, and the dust outlet is connected to the collection unit.

Further, the collection unit is mainly composed of a bag filter, the bottom of the bag filter is provided with a dry mud outlet, and the side of the bag filter is provided with a dust inlet, and the dust inlet is connected to the dust outlet; The top of the bag filter is provided with an air outlet.

With such a structural configuration, the sludge pump pumps the sludge to be treated to the sludge screw press dewaterer, and the sludge screw press dewaterer dehydrates the sludge to obtain clay-like sludge. The water extracted from the screw press dewaterer can be Sent to the sewage treatment system for treatment, the clay-like sludge is sent to the crushing dryer through the screw conveyor, the clay-like sludge is crushed by the crushing mechanism, and at the same time, it is dried under the action of the high-temperature flue gas introduced from the flue gas inlet, and becomes Powdery sludge, powdery sludge rises with the high-temperature flue gas and enters the bag filter; in the bag filter, the powdery sludge settles down and collects at the bottom of the bag filter to obtain the finished dry sludge. The flue gas exhaust is discharged through the exhaust port.

Further, the sludge dehydration and drying device of the present utility model also includes a tail gas treatment unit, the tail gas treatment unit includes an induced draft fan and a spray deodorization tower, the air inlet of the induced draft fan communicates with the exhaust port, and the induced draft fan The gas outlet is connected with the spray deodorization tower.

Further, a gas inlet is provided on the side wall of the spray deodorization tower, and the gas inlet communicates with the air outlet of the induced draft fan; in the spray deodorization tower, fillers are provided above and below the gas inlet layer, the top of the packing layer is provided with a backflow spray mechanism; the bottom of the spray deodorization tower has a drain, and the drain is connected to a backflow pump, and the water outlet of the backflow pump is connected to the backflow spray mechanism; An exhaust port is provided on the top of the spray deodorization tower, and an exhaust chimney is connected to the exhaust port.

The exhaust gas enters the spray deodorization tower through the induced draft fan, and goes through further dust removal and deodorization. After reaching the standard, the exhaust gas is discharged through the chimney to prevent environmental pollution.

Preferably, the sludge dewatering and drying device of the present invention further includes a sludge thickening unit, the discharge port of the sludge thickening unit communicates with the feed port of the sludge pressing and dewatering unit.

Further, the sludge thickening unit includes a sludge tank, a sludge pump is connected to the side bottom of the sludge tank, and a first static mixer and a second static mixer are connected in series at the outlet end of the sludge pump. device, the outlet of the second static mixer is connected with a steady flow dehydration tower, the top of the steady flow dehydration tower is provided with an overflow port, and the steady flow dehydration tower is provided with a conical inner cylinder, and the conical inner cylinder The cross-section gradually increases from top to bottom, and the top of the tapered inner cylinder is connected with a straight pipe; the outlet end of the second static mixer is connected with the straight pipe, and the height of the connection is above the overflow port; A sludge outlet is provided at the bottom of the steady flow dehydration tower, and the sludge outlet communicates with the inlet port of the sludge pump.

Further, a sump is connected to the outside of the steady flow dehydration tower, and a water outlet is provided on the sump.

In the sludge thickening unit, the sludge pump is used to extract the sludge from the sludge tank and send it to the steady flow dehydration tower. During this process, the sludge passes through the first static mixer and the second static mixer in sequence, and then In the static mixer, the sludge is mixed with the coagulant agent and flocculated; the steady flow dehydration tower is equipped with a conical inner cylinder, which divides the steady flow dehydration tower into two sludge deceleration solid-liquid separation areas. The flocculated sludge is dewatered twice to increase the sludge concentration, which facilitates the dehydration treatment of the sludge by the subsequent sludge pressing and dewatering unit; at the same time, the outside of the steady flow dehydration tower is connected with a sump, and the sump is provided with an outlet The rising sewage flows from the overflow to the sump, and the water in the sump flows out through the outlet and can be used in other ways.

Compared with the prior art, the utility model has the following beneficial effects:

1) Wide adaptability, suitable for dehydration and drying of sludge produced by various sewage;

2) Strong continuity and high degree of dehydration. Sludge is treated through continuous flocculation concentration, screw press dehydration and crushing and drying. The sludge treatment process is short, less equipment, low engineering investment, and low operating cost. 98~99wt.% is reduced to 20~30wt.%, the sludge volume is doubled, and the dried sludge can also be used as fuel, reducing the amount of coal burned and further reducing environmental pollution;

3) The equipment has a compact structure, a small footprint, and the cost is 30% to 60% lower than that of traditional sludge treatment equipment;

4) The degree of automation is high, the sludge can be treated in place at one time, and the consumption of manpower and material resources is low. The whole process of sludge dehydration and drying of this device can be controlled by DCS (automatic);

5) This device can be made into various specifications, and has great promotion and application value in the field of sludge treatment.

Description of drawings

Fig. 1 is a schematic structural diagram of a sludge dehydration and drying device in the first embodiment of the present invention.

Fig. 2 is an enlarged view of the sludge pressing and dewatering unit, the sludge drying and dewatering system and the collection unit of the first embodiment of the utility model.

detailed description

The utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. For the convenience of description, if the words "up", "down", "left" and "right" appear in the following, it only means that the directions of up, down, left and right are consistent with the drawings themselves, and do not limit the structure.

Fig. 1 is a schematic structural diagram of a sludge dewatering and drying device according to the first embodiment of the present invention. Specifically, the sludge dewatering and drying device includes a sludge pressing and dehydrating unit, a conveying unit, a sludge crushing and drying unit and A collecting unit, the conveying unit is arranged between the sludge pressing and dewatering unit and the sludge crushing and drying unit, and the conveying unit transports the sludge treated by the sludge pressing and dewatering unit to the sludge crushing and drying unit; the collecting unit The feed port communicates with the discharge port of the sludge crushing and drying unit.

Wherein, the sludge press dewatering unit includes a sludge pump 6 and a screw press dewaterer 7, and the screw press dewaterer 7 is provided with a feed port 701, a discharge port 702 and a discharge port 703, and the screw press dewaterer The machine 7 is provided with a variable-pitch screw extrusion mechanism 705, the variable-pitch screw extrusion mechanism 705 is covered with a filter screen 704, the outlet end of the sludge pump 6 communicates with the feed port 701, and the discharge port 703 communicates with the conveying unit, which is a screw conveyor 8 .

The sludge crushing and drying unit includes a sludge crushing and drying tank 9, the inner bottom of the sludge crushing and drying tank 9 is provided with a crushing mechanism 901, and the bottom of the sludge crushing and drying tank 9 is provided with a flue gas inlet 902. The side wall of the sludge crushing and drying tank 9 is provided with a feeding port 903, and the feeding port 903 is connected with the outlet of the screw conveyor 8; the top of the sludge crushing and drying tank 9 is provided with a dust outlet 904, and the dust The outlet 904 communicates with the collection unit (see Figures 1 and 2).

The collection unit is mainly composed of a bag filter 10, the bottom of the bag filter 10 is provided with a dry mud outlet 1001, and the side of the bag filter 10 is provided with a dust inlet 1002, and the dust inlet 1002 is connected with the dust The outlet 904 is connected; the top of the bag filter 10 is provided with an air outlet 1003 .

The sludge dehydration and drying device of this embodiment also includes a tail gas treatment unit, the tail gas treatment unit includes an induced draft fan 11 and a spray deodorization tower 12, the air inlet of the induced draft fan 11 communicates with the air exhaust port 1003, and the induced draft fan 11 The air outlet of the fan 11 communicates with the spray deodorization tower 12 .

The side wall of the spray deodorization tower 12 is provided with a gas inlet 122, and the gas inlet 122 communicates with the gas outlet of the induced draft fan 11; in the spray deodorization tower 12, the top and bottom of the gas inlet 122 A packing layer 125 is provided, and a backflow spraying mechanism 123 is arranged above the packing layer 125; the bottom of the spray deodorization tower 12 has a water outlet 121, and the water outlet 121 is connected with a backflow water pump 13, and the backflow water pump The water outlet of 13 communicates with the return spray mechanism 123; the top of the spray deodorization tower 12 is provided with an exhaust port 124, and the exhaust port 124 is connected with an exhaust chimney 14.

The sludge dehydration and drying device of this embodiment also includes a sludge concentration unit, the discharge port of the sludge concentration unit is connected with the feed port of the sludge pressing and dehydration unit, and the sludge concentration unit plays a role in pretreatment of sludge. role, to facilitate subsequent processing.

Wherein, the sludge thickening unit includes a sludge tank 1, a sludge pump 2 is connected to the side bottom of the sludge tank 1, and a first static mixer 3 and a first static mixer 3 are connected in series at the outlet end of the sludge pump 2. The second static mixer 4, the outlet of the second static mixer 4 is connected with a steady flow dehydration tower 5, the top of the steady flow dehydration tower 5 is provided with an overflow port 506, and the steady flow dehydration tower 5 is provided with Conical inner cylinder 505, the cross section of the conical inner cylinder 505 gradually increases from top to bottom, the top of the conical inner cylinder 505 is connected with a straight pipe 503; the outlet end of the second static mixer 4 is connected to the straight pipe The pipe 503 is connected, and the height of the connection is above the overflow port 506; the bottom of the steady flow dehydration tower 5 is provided with a sludge outlet 510, and the sludge outlet 510 is communicated with the inlet end of the sludge pump 6; A water collection tank 507 is connected to the outside of the flow dehydration tower 5, and a water outlet 508 is provided on the water collection tank 507.

The sludge tank 1 is provided with a stirring mechanism to keep the sludge concentration relatively stable. A sludge pump 2 is connected to the side bottom of the sludge tank 1, and the outlet end of the sludge pump 2 is connected in series with a second A static mixer 3 and a second static mixer 4 are used to ensure that the sludge is continuously mixed and flocculated with the flocculation agent; the top of the steady flow dehydration tower 5 is provided with an overflow port 506, a conical inner cylinder 505, a sump 507, the water outlet 508, the straight pipe 503 is provided with a nozzle 511, the second static mixer 4 communicates with the straight pipe 503 through the nozzle 511, the straight pipe 503 is provided with a sludge deflector 504, and the sludge deflector The height of the flow plate 504 is lower than the height of the nozzle 511; the bottom of the steady flow dehydration tower 5 is a conical structure 509, the diameter of the conical structure 509 gradually decreases from top to bottom, and the bottom of the conical structure 509 is set There is a sludge outlet 510; the conical inner cylinder 505 divides the steady flow dehydration tower 5 into two sludge deceleration solid-liquid separation areas, namely the first sludge deceleration solid-liquid separation area 501 and the second sludge deceleration solid-liquid separation area 502, the sewage flows upward after passing through the first sludge deceleration solid-liquid separation zone 501, then passes through the second sludge deceleration solid-liquid separation zone 502, flows from the tower upper overflow port 506 to the water collection 507, and then flows from the water collection tank 507 The water outlet 508 flows out by itself.

The following takes the treatment of sludge with a concentration of 1~2wt.% as an example to illustrate. First, the sludge pump 2 pumps sludge with a concentration of 1~2wt.% from the sludge tank 1, passes through the first static mixer 3 and the second static mixer 4 successively through the sludge pipeline, and passes through the first side port 31 Add liquid polyaluminum chloride PAC with an alumina content of 5~6wt.% (the addition amount is 1~2wt.% of the sludge amount), and add a solid content of 0.1~0.2wt.% at the second side port 41 The liquid polyacrylamide CPAM, the flocculated sludge enters the tower from the straight pipe 503 at the top of the steady flow dehydration tower 5, and is dispersed to the first sludge deceleration solid-liquid separation zone 51 through the sludge deflector 504. In the deceleration solid-liquid separation zone 51, the flow velocity of the flocculated sludge suddenly decreases. Since the sludge has a higher specific gravity than the sewage, the flow velocity is faster than the sewage. The sludge and sewage destabilize due to the difference in flow velocity, and the solid-liquid separation is realized. At this time, the sewage with a small amount of sludge deflects and suddenly accelerates to flow upwards and enters the second sludge deceleration solid-liquid separation area 502. In the second sludge deceleration solid-liquid separation area 502, the sewage and a small amount of sludge it carries flow The speed keeps decreasing, the sewage continues upward, and the sludge flows downward under the action of gravity to achieve further separation. As the flocculated sludge continuously enters the steady flow dehydration tower, the second sludge deceleration solid-liquid separation zone 502 A certain amount of sludge will accumulate inside and form a filter layer, which can filter the sewage flowing through, so that the amount of mud in the sewage is continuously reduced. When the sewage rises to the overflow port 506, the water has become clear and flows from the overflow port 506 Enter the sump 507, and flow out from the water outlet 508 by itself. At the same time, the concentrated sludge sinks continuously under the action of gravity and reaches the conical structure 509 at the bottom of the tower. The sludge continues to flow downward and dehydrate under the dual effects of gravity and static pressure until it reaches the bottom of the tower. At this time, the sludge concentration reaches 4~6wt.%, then, the sludge pump 6 pumps the concentrated sludge with a concentration of 4~6wt.% from the sludge outlet 510 at the bottom of the tower to the filter cartridge of the screw press dehydrator 7. The screw extrusion mechanism 705 continuously dehydrates under the rotating extrusion, and when the sludge concentration reaches 40~50wt.%, it enters the screw conveyor 8 from the discharge port 703; after that, the screw conveyor 8 will reduce the sludge content to 40~50wt.%. % of the sludge is sent to the bottom of the sludge crushing and drying tank 9, where the sludge is crushed into powder by the high-speed rotating crushing mechanism 901 at the bottom of the sludge crushing and drying tank 9, and the sludge that enters from the bottom side of the sludge crushing and drying tank 9 The high-temperature flue gas is dried and dehydrated, and along with the flue gas leaves the drying tower from the outlet 903 at the top of the tower and enters the bag filter 10, the dried sludge is intercepted by the bag, and the water content of less than 30wt.% can be collected at the dried sludge outlet 1001 dry sludge, the tail gas leaves the bag filter 10 through the top air outlet 1002 through the bag, the tail gas enters the spray deodorization tower 12 through the induced draft fan 11, and the dust and odor in the tail gas are mixed with the chemical agent at the packing layer 125 The circulating water contacts and is removed, and the up-to-standard tail gas enters the chimney from the top exhaust port 124 for discharge.

The above-mentioned embodiments should be understood that these embodiments are only used to illustrate the utility model more clearly, and are not intended to limit the scope of the utility model. After reading the utility model, those skilled in the art will understand each aspect of the utility model Modifications in various equivalent forms all fall within the scope defined by the appended claims of this application.

Claims (10)

1. a kind of sludge dewatering, drying device, it is characterised in that including sludge pressing dewatering unit, supply unit, sludge crushing Drying unit and collector unit, the supply unit are arranged between sludge pressing dewatering unit and sludge crushing drying unit, Sludge after the processing of sludge pressing dewatering unit is transported in sludge crushing drying unit by supply unit；The collector unit Charging aperture is connected with the discharging opening of sludge crushing drying unit.

2. sludge dewatering according to claim 1, drying device, it is characterised in that the sludge pressing dewatering unit bag Include sludge pump（6）And spiral pressing dehydrator（7）, the spiral pressing dehydrator（7）It is provided with charging aperture（701）, discharge outlet （702）And discharging opening（703）, the spiral pressing dehydrator（7）It is interior to be provided with variable-pitch propeller pressing mechanism（705）, the displacement Screw extrusion machinery（705）On be cased with screen pack（704）, the sludge pump（6）The port of export and charging aperture（701）Connection, institute State discharging opening（703）Connected with supply unit.

3. sludge dewatering according to claim 1 or 2, drying device, it is characterised in that the supply unit is spiral transferring Send machine（8）.

4. sludge dewatering according to claim 3, drying device, it is characterised in that the sludge crushing drying unit bag Include sludge crushing drying chamber（9）, the sludge crushing drying chamber（9）Inner bottom part be provided with crushing mechanism（901）, the sludge break Broken drying chamber（9）Bottom be provided with gas approach（902）, the sludge crushing drying chamber（9）Side wall be provided with dog-house （903）, the dog-house（903）With conveying worm（8）Outlet connection；The sludge crushing drying chamber（9）Top set There is dust outlet（904）, the dust outlet（904）Connected with collector unit.

5. sludge dewatering according to claim 4, drying device, it is characterised in that the collector unit is main by cloth bag Dust-precipitator（10）Composition, the bagroom（10）Bottom provided with dry mud export（1001）, bagroom（10）Side Portion is provided with dust inlet（1002）, the dust inlet（1002）With dust outlet（904）Connection；The bagroom（10） Top be provided with exhaust outlet（1003）.

6. sludge dewatering according to claim 5, drying device, it is characterised in that also including tail gas treating unit, described Tail gas treating unit includes air-introduced machine（11）With spray deodorizing tower（12）, the air-introduced machine（11）Air inlet and exhaust outlet （1003）Connection, air-introduced machine（11）Gas outlet with spray deodorizing tower（12）Connection.

7. sludge dewatering according to claim 6, drying device, it is characterised in that the spray deodorizing tower（12）Side Wall is provided with gas feed（122）, the gas feed（122）With air-introduced machine（11）Gas outlet connection；Spray deodorizing tower （12）It is interior, the gas feed（122）Top, lower section be equipped with packing layer（125）, packing layer（125）Top be provided with back Flow spraying mechanism（123）；The spray deodorizing tower（12）Bottom have discharge outlet（121）, the discharge outlet（121）Place is connected with Flow back water pump（13）, the backflow water pump（13）Delivery port with backflow spraying mechanism（123）Connection；The spray deodorizing tower （12）Top be provided with exhaust outlet（124）, the exhaust outlet（124）Place is connected with exhaust chimney（14）.

8. sludge dewatering, drying device according to any one of claim 1,4,5,6,7, it is characterised in that also including dirt Mud upgrading unit, the discharging opening of the sludge condensation unit is connected with the charging aperture of sludge pressing dewatering unit.

9. sludge dewatering according to claim 8, drying device, it is characterised in that the sludge condensation unit includes dirt Mud sump（1）, the sludge-tank（1）Side bottom be connected with sludge pump（2）, the sludge pump（2）The port of export be sequentially connected in series First static mixer（3）With the second static mixer（4）, second static mixer（4）Outlet has current stabilization dehydration Tower（5）, the current stabilization dehydrating tower（5）Top be provided with overfall（506）, the current stabilization dehydrating tower（5）It is interior to be provided with taper inner cylinder （505）, taper inner cylinder（505）Cross section gradually increase from top to bottom, the taper inner cylinder（505）Top be connected with straight tube （503）；Second static mixer（4）The port of export and straight tube（503）Connection, the height of the junction is in overfall （506）On；The current stabilization dehydrating tower（5）Bottom be provided with sludge outlet（510）, the sludge outlet（510）With sludge pump （6）Entrance point connection.

10. sludge dewatering according to claim 9, drying device, it is characterised in that the current stabilization dehydrating tower（5）It is outer Side is connected with water leg（507）, the water leg（507）It is provided with delivery port（508）.