CN211946767U

CN211946767U - Sludge treatment device achieving clean discharging

Info

Publication number: CN211946767U
Application number: CN202020228416.XU
Authority: CN
Inventors: 陈正; 陈蕾; 杨冬伟
Original assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Current assignee: Lanzhou Engineering and Research Institute of Nonferrous Metallurgy Co Ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-11-17
Anticipated expiration: 2030-02-28

Abstract

The utility model discloses a clean sludge treatment equipment who discharges belongs to the environmental protection field, solves the higher problem of cost that the flue gas that the carbonization produced was handled to current method exists. The utility model comprises a storage bin, a rotary kiln, a combustion device, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first air blower, a second air blower and a third air blower, wherein the storage bin is connected with the rotary kiln, an exhaust port of the combustion device is connected with the first heat exchanger, the first air blower is connected with the first heat exchanger, and the first heat exchanger is connected with the combustion device; the feeding end of the rotary kiln is connected with a cyclone dust collector, an air outlet of the cyclone dust collector, a second heat exchanger, a third heat exchanger and a third air blower are sequentially connected, an air outlet of the third air blower is respectively connected with the discharging end of the rotary kiln and the combustion device, and the second air blower is connected with the second heat exchanger. The utility model discloses make the flue gas that dry carbonization produced constantly circulate, the heat transfer in the system, its heat is by abundant reuse, has reduced the emission of flue gas.

Description

Sludge treatment device achieving clean discharging

Technical Field

The utility model belongs to the environmental protection field, concretely relates to sludge treatment equipment of clean emission.

Background

In the fields of energy, chemical industry, textile printing and dyeing, municipal administration, environmental protection and the like, a large amount of sludge is usually generated, the sludge is a solid precipitate generated in the sewage treatment process, the main characteristics are that the water content is high, the organic matter content is high, the sludge is easy to rot and stink, the particles are fine and are in a colloidal liquid state, the components of the sludge are very complex, besides a large amount of water, the sludge also contains a large amount of organic matters, organic matters which are difficult to degrade, a plurality of trace elements, pathogenic microorganisms, parasitic ova, heavy metals and the like, and stink is accompanied, the sludge contains a large amount of organic matters, abundant nitrogen, phosphorus and other nutrient substances, the eutrophication of water quality is caused, the water quality is deteriorated, and meanwhile, the heavy metals, toxic substances, pathogenic bacteria and the like. If the sludge is not properly disposed, "secondary pollution" will be caused, which has become a difficult problem in the field of environmental protection and is of great concern. The overall aim of sludge treatment and disposal is to realize reduction, stabilization, harmlessness and recycling of sludge.

The most thorough method for sludge treatment is a burning method, and the burning is divided into two types: one is direct incineration, i.e. the sludge is dehydrated and incinerated together, and the other is dehydration and drying and then incineration, i.e. the dehydration, drying and incineration are carried out separately.

The residue generated by the incineration method is minimum, no peculiar smell exists, the sludge can be reduced rapidly and to a greater extent, and the sterilization treatment is not needed.

Incineration is generally carried out in rotary kilns, also divided into two types: the method adopts an internal heating type rotary kiln, heating fuel is combusted in the rotary kiln, flue gas and water and organic volatile matters generated during sludge incineration are mixed together, and the flue gas is fully combusted through a secondary combustion chamber, subjected to desulfurization and denitrification and subjected to dioxin removal treatment and then exhausted.

The other method adopts an external heating type rotary kiln to dry or carbonize the sludge at high temperature.

The sludge carbonization is a process of releasing moisture in the sludge by a certain means, and simultaneously, maximally retaining the carbon value in the sludge to greatly increase the carbon content in a final product.

Two kinds of smoke are generated during carbonization, the first kind is smoke generated by heating the outer cylinder, and the second kind is smoke generated during carbonization. The first method uses clean fuel such as natural gas to heat, and the flue gas generated by heating can be simply collected dust and then evacuated, and when the clean fuel is electrically heated, no heating flue gas is generated. The second kind of smoke generated during carbonization contains a large amount of oil, water, smoke and dust and other substances, and is generally evacuated after cooling, dust collection, deodorization, dioxin and sulfur removal, so that the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sludge treatment device of clean emission to solve the problem that the cost is higher that the flue gas that the carbonization produced was handled to current method exists.

The technical scheme of the utility model is that: a sludge treatment device for clean discharge comprises a storage bin, a rotary kiln, a combustion device, three heat exchangers and three air blowers, wherein the storage bin is connected with a feeding end of the rotary kiln; the smoke outlet of the combustion device is connected with the first heat exchanger, the first air blower is connected with the first heat exchanger, and the first heat exchanger is connected with the combustion device; the feeding end of the rotary kiln is connected with a cyclone dust collector, an air outlet of the cyclone dust collector, a second heat exchanger, a third heat exchanger and a third air blower are sequentially connected, an air outlet of the third air blower is respectively connected with the discharging end of the rotary kiln and the combustion device, and the second air blower is connected with the second heat exchanger.

As a further improvement of the utility model, an exhaust fan is arranged between the third air blower and the combustion device. The exhaust fan is mainly used for keeping the interior of the rotary kiln in a negative pressure state and preventing smoke from escaping to the environment through the discharge end of the rotary kiln.

As a further improvement of the utility model, a first valve is arranged between the third air blower and the discharge end of the rotary kiln.

As a further improvement of the utility model, a second valve is arranged between the third air blower and the combustion device.

As a further improvement of the utility model, the feed bin is connected with the feeding end of the rotary kiln through the screw feeder.

As a further improvement, the lower end of the cyclone dust collector is connected with the stock bin.

The utility model has the advantages that: the utility model adopts the external heating rotary kiln to dry and carbonize the sludge, and is provided with three heat exchangers and three blowers, so that the flue gas generated by drying and carbonization continuously circulates and exchanges heat in the system, on one hand, the heat of the flue gas is fully and repeatedly utilized to achieve the purpose of energy saving, and on the other hand, the emission of the flue gas is reduced; by adopting the utility model, the flue gas in the rotary kiln is deoiled and dehydrated and then enters the combustion device for clean combustion, and then is combined with the flue gas generated by the combustion device for emptying, so that the flue gas volume is greatly reduced, and deodorization, desulfurization and denitrification are not needed, thereby greatly reducing the investment amount; the utility model has the advantages of investment saving, small occupied area, simple process, etc.

Drawings

FIG. 1 is a schematic view showing the construction of a sludge treatment apparatus for clean discharge.

In the figure, 1-stock bin; 2-a rotary feeder; 3-a rotary kiln; 31-a feed end; 32-a discharge end; 4-a combustion device; 41-smoke outlet; 5-a first heat exchanger; 6-a first blower; 7-cyclone dust collector; 8-a second blower; 9-a second heat exchanger; 10-a third heat exchanger; 11-a third blower; 12-a first valve; 13-a second valve; 14-a suction fan.

Detailed Description

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

As shown in fig. 1, a clean sludge treatment device who discharges includes feed bin 1, rotary kiln 3, burner 4, heat exchanger and air-blower, and feed bin 1 links to each other its characterized in that with rotary kiln 3's charge end 31: the number of the heat exchangers is three, namely a first heat exchanger 5, a second heat exchanger 9 and a third heat exchanger 10, and the number of the blowers is three, namely a first blower 6, a second blower 8 and a third blower 11; the smoke outlet 41 of the combustion device 4 is connected with the first heat exchanger 5, the first air blower 6 is connected with the first heat exchanger 5, and the first heat exchanger 5 is connected with the combustion device 4; the feeding end 31 of the rotary kiln 3 is connected with a cyclone dust collector 7, an air outlet of the cyclone dust collector 7, a second heat exchanger 9, a third heat exchanger 10 and a third air blower 11 are sequentially connected, an air outlet of the third air blower 11 is respectively connected with the discharging end 32 of the rotary kiln 3 and the combustion device 4, and a second air blower 8 is connected with the second heat exchanger 9.

An exhaust fan 14 is arranged between the third blower 11 and the combustion device 4.

A first valve 12 is arranged between the third blower 11 and the discharge end 32 of the rotary kiln 3. A second valve 13 is provided between the third blower 11 and the combustion device 4.

The silo 1 is connected with the feeding end 31 of the rotary kiln 3 through the screw feeder 2.

The lower end of the cyclone dust collector 7 is connected with the bin 1.

The operation process is as follows:

A. wet sludge is added into a rotary kiln 3 from a storage bin 1 through a screw feeder 2, the rotary kiln 3 adopts an external heating mode, and a combustion device 4 combusts to provide heat for drying or carbonization;

B. the gas generated in the drying process contains a large amount of moisture, oil and dust, is pumped out from the feeding end 31 of the rotary kiln 3, is firstly subjected to dust removal by the cyclone dust collector 7, and then enters the second heat exchanger 9; dust collected in the cyclone dust collector 7 returns to the storage bin 1; the material leaked from the feeding end 31 also returns to the stock bin 1;

C. the air is blown into the second heat exchanger 9 by the second air blower 8, the heat of the flue gas entering the second heat exchanger 9 is transferred to the blown air, the air is heated, the temperature of the flue gas is reduced to be below the dew point of water and oil, the water and the oil contained in the flue gas are condensed and separated in the second heat exchanger 9 and flow out to enter a water treatment system;

D. c, after heat exchange is carried out on the smoke and the hot air in the second heat exchanger, the smoke and the hot air enter a third heat exchanger 10, then the hot air transfers heat to the smoke in the third heat exchanger 10, and the hot air is cooled and then is emptied;

E. after being heated in the heat exchanger 10, the flue gas passes through a third air blower 11 to control the opening degree of a first valve 12 and a second valve 13, most of the flue gas is sent into the rotary kiln 3 through a discharge end 32 of the rotary kiln 3 to continuously dry materials, and the least of the flue gas is sent to a combustion device 4 through an exhaust fan 14 to be combusted;

F. flue gas generated by the combustion device 4 enters the first heat exchanger 5 through the smoke outlet 41, the first air blower 6 blows air into the first heat exchanger 5, the flue gas and the air in the first heat exchanger 5 exchange heat, the flue gas is exhausted after being treated by tail gas, and the heated air is blown into the combustion device 4 to provide secondary combustion air;

G. the material is dried or carbonized in the rotary kiln 3, and the dried or carbonized sludge is discharged from the discharge end 32.

The external heating of the rotary kiln 3 (namely the combustion device 4) can use clean fuels such as natural gas and the like for clean discharge.

The utility model discloses be fit for the mummification of municipal administration mud, oily sludge and handle, produce oily waste water during the mummification of oily sludge, available oil-water separation technique separation water and oil, oil after the separation is done can be fuel heating rotary kiln 3.

Adopt the utility model discloses, get into the clean burning back of outer combustion chamber and merge the evacuation with the flue gas in burner 4 after the dehydration because of the flue gas deoiling in the rotary kiln 3, the flue gas volume significantly reduces need not deodorization and SOx/NOx control, but consequently greatly reduced investment volume. The actual investment amount is about half of the traditional investment amount.

Claims

1. The utility model provides a sludge treatment equipment of clean emission, includes feed bin, rotary kiln, burner, heat exchanger and air-blower, the feed bin links to each other its characterized in that with the charge end of rotary kiln: the heat exchangers are respectively a first heat exchanger (5), a second heat exchanger (9) and a third heat exchanger (10), and the blowers are respectively a first blower (6), a second blower (8) and a third blower (11); a smoke outlet (41) of the combustion device (4) is connected with the first heat exchanger (5), the first air blower (6) is connected with the first heat exchanger (5), and the first heat exchanger (5) is connected with the combustion device (4); a feeding end (31) of the rotary kiln (3) is connected with a cyclone dust collector (7), an air outlet of the cyclone dust collector (7), a second heat exchanger (9), a third heat exchanger (10) and a third air blower (11) are sequentially connected, an air outlet of the third air blower (11) is respectively connected with a discharging end (32) of the rotary kiln (3) and a combustion device (4), and a second air blower (8) is connected with the second heat exchanger (9).

2. The apparatus of claim 1, wherein the sludge treatment apparatus comprises: an exhaust fan (14) is arranged between the third blower (11) and the combustion device (4).

3. The apparatus for sludge treatment with clean discharge according to claim 1 or 2, wherein: a first valve (12) is arranged between the third blower (11) and the discharge end (32) of the rotary kiln (3).

4. A device for the treatment of sludge for clean discharge according to claim 3, characterized in that: a second valve (13) is arranged between the third blower (11) and the combustion device (4).

5. The apparatus of claim 4, wherein the sludge treatment apparatus comprises: the feed bin (1) is connected with a feeding end (31) of the rotary kiln (3) through a screw feeder (2).

6. The apparatus of claim 5, wherein the sludge treatment apparatus comprises: the lower end of the cyclone dust collector (7) is connected with the storage bin (1).