CN111056727B

CN111056727B - Hot air equipment for sludge drying

Info

Publication number: CN111056727B
Application number: CN201911400586.XA
Authority: CN
Inventors: 辛政君; 张雪海; 马彦峰
Original assignee: Xinjiang Origin Water Environmental Resource Co ltd
Current assignee: Xinjiang Origin Water Environmental Resource Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2024-03-05
Anticipated expiration: 2039-12-30
Also published as: CN111056727A

Abstract

The invention discloses hot air equipment for sludge drying, which comprises a feed hopper 1, a blower 9, a manual butterfly valve 10, a pneumatic butterfly valve 11, a feeding screw 12 and a box body 4, wherein the top end of the box body 4 is sequentially provided with a star feeder 2 and the feed hopper 1 from bottom to top, two sides of the upper part of the box body 4 are respectively provided with an air outlet 3, the lower part of the box body 4 is internally provided with an air permeable tray 6 from top to bottom, a rotating shaft of the air permeable tray 6 extends to the outside of the box body 4 and is connected with a pneumatic actuator 5, an outlet hopper 7 and a pneumatic gate valve 8 are arranged below the air permeable tray 6, the blower 9 is connected on the side wall of the box body 4 between the outlet hopper 7 and the air permeable tray 6 through a pipeline provided with the manual butterfly valve 10 and the pneumatic butterfly valve 11, the feeding screw 12 is positioned above the feed hopper 1, and an observation port 13 is arranged on the side wall of the box body 4. The invention can reduce the water content of the sludge discharged by the sewage treatment plant to below 60% by using the hot air generated by the blower.

Description

Hot air equipment for sludge drying

Technical Field

The invention belongs to the field of sewage sludge treatment, and relates to hot air equipment for sludge drying.

Background

Since 2015, the requirements of the country on sludge treatment are higher and higher, and the water content of the sludge in most areas of the country must be reduced from 80% to 60% so as to be buried. The drying technology which is mature in China at the present stage comprises plate-frame filter pressing dehydration, traditional heat drying (hollow blade), solar sludge drying, sludge low-temperature condensation drying and the like. Modifying agents such as lime are required to be added for plate-frame filter pressing dehydration, inconvenience is brought to subsequent sludge treatment, and the water content requirement of the sludge cannot be met if the water content requirement is further improved; the traditional heat drying technology cannot be recycled due to serious heat energy loss, so that the sludge treatment energy consumption is high, the cost is high, the drying temperature is up to 150-200 ℃, and the hidden danger of sludge dust explosion exists; the solar sludge treatment technology is limited by the treatment capacity of the solar sludge treatment technology, and the construction cost is very high; the sludge low-temperature condensation drying technology is still immature at present, and the actual operation consumes large energy and has low productivity.

Disclosure of Invention

The invention aims to provide hot air equipment for sludge drying, which can reduce the water content of sludge discharged by a sewage treatment plant to below 60% by using hot air generated by a blower.

The technical proposal is as follows: the utility model provides a hot air apparatus for sludge drying, which comprises a feed hopper, the air-blower, manual butterfly valve, pneumatic butterfly valve, feeding screw and box, star-shaped feeder and feeder hopper are set gradually from bottom to top on the box top, the air outlet is set up respectively in the box upper portion both sides, the ventilative tray is set up in the box lower part, the pivot of ventilative tray stretches to the box outside and links to each other with a pneumatic actuator, discharge hopper and pneumatic push-pull valve are set up below the ventilative tray, the air-blower passes through the pipeline connection of installing manual butterfly valve and pneumatic butterfly valve on the box lateral wall between discharge hopper and ventilative tray, feeding screw is located the feeder hopper top, the viewing aperture sets up on the lateral wall of box; the breathable tray comprises a long groove body, the bottom surface of the long groove body is open, a plurality of angle irons are uniformly arranged in the long groove body at intervals along the long edge direction of the long groove body, gaps are reserved among the angle irons, the gap size is 5mm, and the top ends of the angle irons are parallel to the wide edge of the long groove body.

Firstly, a hot air conveying system is started, sludge is conveyed to a feeder by a sludge conveyor, quantitative sludge is conveyed to a box body by the feeder and stays on an air permeable tray in the box body, dry hot air from a blower exchanges heat with the sludge and takes away redundant water, after the water content of the sludge is reduced to a required value, an air inlet channel valve is automatically closed, the air permeable tray in the box body is turned over by 90 degrees, the dry sludge falls downwards by self gravity, and is conveyed to a loading position by a conveying belt after falling out of the box body. In the normal load range of the blower, a plurality of independent boxes can be arranged in the system so as to realize the adjustment of the sludge yield and meet the requirement of continuous operation.

Compared with the prior art, the invention has the advantages that: 1. the sludge drying efficiency can be regulated and controlled. 2. Belonging to the low-temperature drying category. 3. The water content of the dried sludge can be regulated. 4. Can output continuously with high efficiency and stability. 5. The equipment occupies small area and has lower investment cost. 6. Simple structure is convenient for dismantle installation and maintenance.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a front view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a view showing the operation of the ventilation tray of the present invention;

FIG. 4 is a schematic view of a cross-sectional front view of the air-permeable tray of the present invention;

fig. 5 is a discharge state diagram of the air-permeable tray of the present invention.

Description of the embodiments

The utility model provides a hot air equipment for sludge drying, as shown in fig. 1-5, including feeder hopper 1, air-blower 9, manual butterfly valve 10, pneumatic butterfly valve 11, feeding screw 12 and box 4, box 4 top is from top to bottom set gradually star feeder 2 and feeder hopper 1, the upper portion both sides of box 4 are provided with air outlet 3 respectively, be provided with ventilative tray 6 in the lower part of box 4, ventilative tray 6's pivot stretches to the outside of box 4 and links to each other with a pneumatic actuator 5, ventilative tray 6 below is provided with hopper 7 and pneumatic push-pull valve 8, air-blower 9 is connected on box 4 lateral wall between hopper 7 and ventilative tray 6 through the pipeline that installs manual butterfly valve 10 and pneumatic butterfly valve 11, feeding screw 12 is located feeder hopper 1 top, viewing port 13 sets up on box 4's lateral wall; the breathable tray 6 comprises a long groove body, the bottom surface of the long groove body is open, a plurality of angle irons are uniformly arranged in the long groove body at intervals along the long edge direction of the long groove body, gaps are reserved among the angle irons, the gap size is 5mm, and the top ends of the angle irons are parallel to the wide edge of the long groove body.

The working process of the equipment comprises the following steps: firstly, the blower 9 starts to work, the pneumatic butterfly valve 11 on the working box body corresponding to the air supply channel is opened, and air supply is started to be carried out upwards from the bottom. After the sludge enters the feeding screw 12, the feeding is started from the first operation box 4 of the system, and after the feeding task is finished, each box 4 can start the feeding procedure of the next box. The sludge firstly enters the feed hopper 1, the sludge is fed into the star-shaped feeder 2 through the feed hopper 1, the star-shaped feeder 2 conveys the sludge into the box 4, the heat exchange is carried out between the sludge on the air-permeable tray 6 and the dry hot air conveyed by the air blower 9, when the water content of the sludge is reduced to a required value, the pneumatic actuator 5 starts to work, the air-permeable tray 6 rotates by 90 degrees and then starts to discharge, the sludge freely falls into the discharge hopper 7, the pneumatic gate valve 8 is opened, and the sludge is conveyed to a loading position after falling into the conveying belt 14 from the discharge hopper 7.

The equipment control process comprises the following steps: the feeding screw 12 performs a periodic feeding operation (quantitative and timing) for each tank according to the working period of each tank, which can be set according to the length required for drying the sludge under the current conditions (water content and working environment temperature). The manual butterfly valve 10 can be adjusted to a proper pressure by adjusting the manual butterfly valve 10, and when the pneumatic butterfly valve 11 fails, the manual butterfly valve 10 can also be used as an emergency switch, so that the safe operation of equipment is ensured. The manual butterfly valve 10 is always in a normally open state when the device is in operation. The pneumatic butterfly valve 11 is controlled according to the working state of the box 4, and when the box 4 is in the drying process, the pneumatic butterfly valve 11 is normally open. When the drying process of the box body 4 is finished, the pneumatic butterfly valve 11 is closed, and when the feeding screw feeds the box body again, the pneumatic butterfly valve 11 is opened again. The viewing window 13 may act as both a viewing window and an inspection window for the operation of the device.

Claims

1. A hot air equipment for sludge drying, includes feeder hopper (1), air-blower (9), manual butterfly valve (10), pneumatic butterfly valve (11), pay-off spiral (12) and box (4), characterized by: the top end of the box body (4) is sequentially provided with a star-shaped feeder (2) and a feed hopper (1) from bottom to top, two sides of the upper part of the box body (4) are respectively provided with an air outlet (3), the lower part of the box body (4) is internally provided with a ventilation tray (6), a rotating shaft of the ventilation tray (6) extends to the outside of the box body (4) and is connected with a pneumatic actuator (5), a discharge hopper (7) and a pneumatic gate valve (8) are arranged below the ventilation tray (6), a blower (9) is connected to the side wall of the box body (4) between the discharge hopper (7) and the ventilation tray (6) through a pipeline provided with a manual butterfly valve (10) and a pneumatic butterfly valve (11), a feeding screw (12) is arranged above the feed hopper (1), and an observation port (13) is arranged on the side wall of the box body (4); the breathable tray (6) comprises a long groove body (20), the bottom surface of the long groove body (20) is open, a plurality of angle irons (21) are uniformly arranged in the long groove body (20) at intervals along the long side direction of the long groove body, gaps (22) are reserved among the angle irons (21), the size of the gaps (22) is 5mm, and the top ends (23) of the angle irons (21) are parallel to the wide side (24) of the long groove body.