CN108224430B

CN108224430B - Household garbage collaborative sludge incineration device

Info

Publication number: CN108224430B
Application number: CN201810079501.1A
Authority: CN
Inventors: 丁兆勇; 尹水娥; 刘晶昊
Original assignee: China Urban Construction Design and Research Institute Co Ltd
Current assignee: China Urban Construction Design and Research Institute Co Ltd
Priority date: 2018-01-26
Filing date: 2018-01-26
Publication date: 2023-07-25
Anticipated expiration: 2038-01-26
Also published as: CN108224430A

Abstract

The invention belongs to the field of garbage treatment, and provides a household garbage collaborative sludge incineration device. The device comprises: the incinerator is provided with a hearth, the grate is positioned in the hearth, and the household garbage is incinerated on the grate; and the burner is positioned in the hearth and above the fire grate, and is used for dispersing the dry sludge particles into the hearth of the incinerator and fully mixing the dry sludge particles with air. The household garbage synergistic sludge incineration device provided by the invention can fully utilize the heat energy released by the combustion of the household garbage to treat municipal sludge on a large scale, improves the blending proportion of the sludge, can adjust the sludge blending amount in real time according to the combustion condition in the incinerator, and provides the energy utilization rate and the sludge treatment efficiency.

Description

Household garbage collaborative sludge incineration device

Technical Field

The invention belongs to the field of garbage treatment, and particularly relates to a household garbage collaborative sludge incineration device.

Background

By the 2015 year, the harmless disposal rate of the municipal sludge is 53 percent and the harmless disposal rate of the county sludge is 24.3 percent.

At present, the water content of the sludge produced by the municipal sewage treatment plant in China is generally 75-80% after mechanical dehydration, and 75% is almost the limit which can be reached by mechanical dehydration.

The current disposal modes of sludge mainly comprise landfill, incineration, land utilization, microorganism treatment and the like. The modes of landfill, incineration, microorganism treatment and the like are similar to the treatment mode of household garbage, and the treatment mode has advantages and disadvantages. The sludge after mechanical dehydration is directly buried, and the occupied area is large; a large amount of percolate and landfill gas can be generated after the sludge with higher organic matter content is buried; the dewatered sludge does not meet the shearing strength requirement of the landfill site, and the water permeability and the soil covering performance of the landfill site can be affected by barely landfill, so that the service life of the landfill site is shortened. At present, the landfill proportion of municipal sludge is gradually reduced in all countries. The direct incineration needs to be fed with fuel for supporting combustion and has high energy consumption. The direct mixed incineration causes the reduction of the temperature of a hearth and the reduction of the efficiency of a boiler, and auxiliary fuel is required to be added to maintain normal operation; the content of water vapor in the flue gas discharged by the boiler system is increased sharply, so that the corrosion to the boiler and subsequent flue gas treatment equipment is accelerated; the discharged flue gas contains a large amount of high-temperature steam, so that the load of flue gas aftertreatment is increased, and the operation effect of dust removal equipment is influenced. The sludge land utilization has the advantages that the landfill volume is not needed, the resource substances in the sludge can be effectively utilized, and the defect that a certain environmental risk exists is that harmful substances in the sludge can have adverse effects on groundwater, surrounding water bodies and crops. The microbiological treatment requires a large floor space, low efficiency, long cycle and risk of malodour loss.

The sludge treatment and disposal requirements are as follows: stabilization, innocuity, reduction and recycling.

By burning, organic matters, bacteria and the like are burned out, and solid residues are buried, so that stabilization and harmlessness are realized; the volume of the sludge with the water content of 80% can be reduced by 90%, so that the reduction is realized; the heat value of the sludge with 40% of water content is equivalent to that of the household garbage, so that the water content of the sludge is reduced to a certain degree, and the recycling can be realized.

The sludge with 75-80% of water content after mechanical dehydration is directly cooperated with the household garbage incineration, and the maximum co-combustion cannot exceed 20%, which cannot meet the requirements of current technical development and social progress and increasing sludge treatment pressure. The water content of the sludge with the water content of 80 percent is reduced to about 50 percent, the water in the sludge with the water content of 80 percent can be removed by 75 percent, and the blending ratio can be expected to be improved to more than 50 percent.

As the current sludge blending combustion mostly adopts the way that the sludge and the household garbage are mixed in a garbage pool or the sludge is directly sprayed in a feeding hopper, the two ways have the condition that the sludge and the household garbage are unevenly mixed. The time from the feeding of the household garbage and the sludge to the pushing of the household garbage and the sludge to the burning zone is about 1 to 1.5 hours, once the household garbage has too low heat value or too large mixing proportion of the sludge in a partial area, the temperature of a hearth can be reduced, and then serious hysteresis exists in adjusting the mixing proportion of the sludge.

The sludge with 75-80% of water content after mechanical dehydration is directly burnt, so that a large amount of fuel is consumed; the direct co-combustion of the domestic garbage has a large influence on the temperature of the hearth, the proportion of the treated sludge is too small, the current requirement on the sludge treatment scale to be rapidly increased cannot be met, and the requirements on technical development and social progress are not met.

Therefore, there is a need for a technology for treating municipal sludge by co-incineration of household garbage, which can treat municipal sludge on a large scale and adjust the sludge doping amount in real time according to the combustion conditions in the incinerator.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a household garbage collaborative sludge incineration device.

The invention provides a household garbage collaborative incineration sludge device, which comprises:

the incinerator is provided with a hearth, the grate is positioned in the hearth, and the household garbage is incinerated on the grate;

and the burner is positioned in the hearth and above the fire grate, and is used for dispersing the dry sludge particles into the hearth of the incinerator and fully mixing the dry sludge particles with air.

Preferably, the domestic garbage cooperative sludge incineration device further comprises:

and the dryer is a rotary drum dryer for drying sludge by using hot flue gas or a rotary drum dryer for drying sludge by using steam.

Preferably, the rotary drum dryer for drying sludge by using hot flue gas comprises a drum which is obliquely arranged and rotatable; the low end side of the roller is provided with a smoke inlet and a sludge outlet, and the high end side of the roller is provided with a smoke outlet and a sludge inlet; a plurality of bevel plates with inclination are arranged on the inner wall of the roller;

preferably, a discharge valve is arranged at the sludge outlet for controlling the discharge of the dried sludge formed after drying;

preferably, a plurality of the corner plates are uniformly distributed on the inner wall of the drum along the axial direction of the drum; further preferably, a plurality of the corner plates are also uniformly distributed on the inner wall of the drum along the circumferential direction of the drum at the same time;

preferably, the inclination of the plurality of the corner plates is 30 to 60 °.

Preferably, the rotary drum dryer for drying sludge using steam includes a drum, which is obliquely disposed and rotatable; the roller is of a double-layer structure and comprises an outer steam sleeve and an inner sludge pipe; the steam sleeve and the sludge pipe are isolated from each other; a steam inlet is arranged at the lower end side of the drum, and is communicated with the steam sleeve so as to send steam into the steam sleeve; a steam outlet is arranged at the high end side of the drum, and is communicated with the steam sleeve so as to discharge steam from the steam sleeve; the high end side of the roller is also provided with a sludge inlet which is communicated with the sludge pipe so as to send wet sludge into the sludge pipe; the lower end side of the roller is also provided with a sludge outlet which is communicated with the sludge pipe so as to discharge the dried sludge formed after drying from the sludge pipe; a plurality of bevel plates with inclination are arranged on the inner wall of the sludge pipe;

preferably, a discharge valve is further arranged at the sludge outlet and used for controlling discharge of the dried sludge formed after drying;

preferably, a plurality of the corner plates are uniformly distributed on the inner wall of the sludge pipe along the axial direction of the sludge pipe; further preferably, a plurality of the corner plates are also uniformly distributed on the inner wall of the sludge pipe along the circumferential direction of the sludge pipe at the same time;

and the grinder is used for grinding the sludge subjected to the drying treatment of the dryer, so that the dry sludge is ground into dry sludge particles with the particle size of 1-10 mm.

and the dry sludge bin is used for storing dry sludge particles formed after the grinding treatment of the grinder.

the feeding device comprises a screw feeder and a screw feeder; the dry sludge bin is arranged above the feeding hole of the screw feeder, and the discharging hole of the screw feeder is connected with the feeding hole of the screw feeder.

Preferably, the discharge port of the screw feeder is connected with the feed port of the burner, and a compressed air inlet is arranged at the feed port of the burner.

Preferably, the fire grate is distributed in a step shape and is divided into 3-5 sections and is obliquely arranged, and each section is provided with a plurality of furnace sheets;

the furnace sheets are arranged in a mode of sequentially lowering the heights along the direction from the feed inlet to the slag outlet of the incinerator, so that a step shape is formed.

Preferably, the burner is provided with two rows, namely a first row of burners and a second row of burners;

the first row of burners and the second row of burners are respectively provided with a plurality of burners in parallel; wherein the first row of burners is located upstream of the grate and the second row of burners is located downstream of the grate;

the household garbage collaborative incineration sludge device further comprises screening equipment, wherein the screening equipment screens dry sludge particles formed after grinding, sends the dry sludge particles with larger particle sizes to the first row of burner, and sends the dry sludge particles with smaller particle sizes to the second row of burner;

preferably, the burner is arranged below the secondary air spraying opening, and the secondary air spraying opening is arranged in the hearth of the incinerator and above the fire grate.

The household garbage synergistic sludge incineration device provided by the invention can fully utilize the heat energy released by the combustion of the household garbage to treat municipal sludge on a large scale, improves the blending proportion of the sludge, can adjust the sludge blending amount in real time according to the combustion condition in the incinerator, and provides the energy utilization rate and the sludge treatment efficiency.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

Fig. 1 is a schematic structural diagram of a device for cooperatively incinerating sludge by using household garbage according to an embodiment of the present invention.

Fig. 2 shows a schematic diagram of a preferred construction of a rotary drum dryer for drying sludge using hot flue gases.

Fig. 3 shows a preferred construction of a rotary drum dryer for drying sludge using steam.

Fig. 4 shows a preferred construction of a dry sludge silo and a feeding device, showing a screw feeder and a screw feeder.

Wherein reference numerals in the drawings are as follows:

1-dryer, 2-grinder, 3-burner, 4-incinerator, 5-grate, 6-secondary air jet, 7-dry sludge bin, 31-first row burner, 32-second row burner, 33-compressed air inlet, 81-screw feeder, 82-screw feeder, 111-drum, 112-flue gas inlet, 113-flue gas outlet, 114-sludge inlet, 115-sludge outlet, 116-dog-ear plate, 121-drum, 122-steam sleeve, 123-sludge pipe, 124-steam inlet, 125-steam outlet, 126-sludge inlet, 127-sludge outlet, 128-dog-ear plate.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. For the electrical and communication fields, either a wired connection or a wireless connection is possible. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, the invention provides a device for cooperatively incinerating sludge from household garbage, which comprises a dryer 1, a grinder 2, a burner 3 and an incinerator 4.

The dryer 1 is used for drying sludge subjected to mechanical dehydration so as to reduce the water content of the sludge. The water content of the sludge after mechanical dehydration is generally 75-80%, and can be reduced to 40-60% after drying treatment by the dryer 1. The dryer 1 can utilize the heat of hot flue gas or steam to dry the sludge after mechanical dehydration, further remove the water in the sludge, reduce the water content of the sludge.

As shown in fig. 2, the dryer 1 may be a rotary drum dryer that dries sludge using hot flue gas. The rotary drum dryer includes a drum 111 disposed obliquely. The drum 111 may be rotated by a power device (e.g., a motor). For convenience of description, the higher end of the drum 111 may be referred to as a high end side (left side in fig. 2) and the lower end may be referred to as a low end side (right side in fig. 2). The lower end side of the drum 111 is provided with a smoke inlet 112. The drum 111 is provided at a high end side with a smoke outlet 113. The hot flue gas having a relatively high temperature enters the drum 111 from the flue gas inlet 112, moves from the lower end side to the higher end side in the drum 111, and finally is discharged from the flue gas outlet 113. The high end side of the drum 111 is also provided with a sludge inlet 114. The lower end side of the drum 111 is also provided with a sludge outlet 115. A discharge valve (not shown) may also be provided at the sludge outlet 115 to control the discharge of the dried sludge formed after drying. Wet sludge having a high water content enters the drum 111 from the sludge inlet 114, moves from the high end side to the low end side in the drum 111, and is finally discharged from the sludge outlet 115. A plurality of corner plates 116 having an inclination are provided on the inner wall of the drum 111. In a preferred embodiment, the plurality of corner plates 116 are uniformly distributed on the inner wall of the drum 111 along the axial direction of the drum 111 (i.e., the projections on the central axis of the drum 111 are equally spaced apart from each other or are distributed end to end); it is further preferred that the plurality of corner plates 116 are also uniformly distributed on the inner wall of the drum 111 along the circumferential direction of the drum 111 at the same time (i.e., at the same angle between two by two on the projection of the longitudinal circular surface of the drum 111). For example, when there are three corner plates 116, the three corner plates 116 are disposed on the inner wall of the drum 111 at the same interval or end to end between the projections of the central axis of the drum 111, and form an angle of 120 ° between the projections of the longitudinal circular surfaces of the drum 111. The angle plate 116 may have an inclination of 30 to 60. The inclination of the corner plate 116 refers to the angle between the corner plate 116 and a horizontal plane (the horizontal plane when the corner plate 116 is placed horizontally). The arrangement of the corner plates on the inner wall of the roller 111 can enable the sludge to be carried in the rotating process of the roller 111, and the sludge is thrown down after the sludge rises to a certain angle/height, so that the sludge can be fully contacted with hot flue gas to obtain sufficient heat from the hot flue gas to dry the sludge, and meanwhile, the sludge can be driven by the corner plates to move from the high end side to the low end side of the roller 111.

In actual use, the wet sludge moves from the high end side to the low end side of the drum 111, and the hot flue gas moves from the low end side to the high end side of the drum 111, that is, the wet sludge and the hot flue gas are in countercurrent contact, so that the heat utilization efficiency can be improved. Specifically, the wet sludge enters the drum 111 from the sludge inlet 114 positioned at the high end side of the drum 111, and the drum 111 is driven to rotate by the power equipment, so that the wet sludge falls off and turns over after rising to a certain height along with the rotation of the drum 111, and is fully contacted with the countercurrent hot flue gas entering from the flue gas inlet 112 at the low end side of the drum 111, thereby accelerating the drying and heat transfer. In the drying process of wet sludge, since the plurality of corner plates 116 are provided on the inner wall of the drum 111, the sludge can be dehydrated and dried while moving toward the lower end side of the drum 111 by the corner plates 116 having an inclination and the hot flue gas flow. By adjusting the rotation speed of the drum 111, the drying time of the sludge in the drum 111 can be adjusted, and the faster the rotation speed of the drum 111, the shorter the drying time of the sludge in the drum 111, and the higher the water content after drying, and conversely, the lower the water content of the sludge. Accordingly, the flow rate of the hot flue gas and the rotation speed of the drum 111 can be set according to the moisture content of the wet sludge and the moisture content of the target outlet sludge (i.e., the moisture content of the dry sludge discharged from the sludge outlet 115 of the drum 111). In practical applications, the hot flue gas may be flue gas from a waste incinerator.

As shown in fig. 3, the dryer 1 may be a rotary drum dryer that dries sludge using steam. The rotary drum dryer includes a drum 121 disposed obliquely. The drum 121 may be rotated by a power device (e.g., a motor). The drum 121 has a double-layered structure including an outer steam jacket 122 and an inner sludge pipe 123. The steam sleeve 122 and the sludge pipe 123 are isolated from each other. The steam sleeve 122 is for passing steam. The sludge pipe 123 is for passing sludge. For convenience of description, the higher end of the drum 121 may be referred to as a high end side (left side in fig. 3) and the lower end may be referred to as a low end side (right side in fig. 3). The drum 121 is provided at a lower end side thereof with a steam inlet 124. The steam inlet 124 communicates with the steam jacket 122 to feed steam into the steam jacket 122. The drum 121 is provided at a high end side with a steam outlet 125. The steam outlet 125 communicates with the steam jacket 122 to exhaust steam from within the steam jacket 122. The hot steam having a relatively high temperature enters the drum 121 from the steam inlet 124 and moves from the low end side to the high end side in the drum 121 and finally is discharged from the steam outlet 125, thereby transferring heat to the wet sludge located in the sludge pipe 123, so that the wet sludge is dehydrated and dried. The high end side of the drum 121 is also provided with a sludge inlet 126. The sludge inlet 126 communicates with the sludge pipe 123 to feed wet sludge into the sludge pipe 123. The lower end side of the drum 121 is also provided with a sludge outlet 127. The sludge outlet 127 communicates with the sludge pipe 123 to discharge the dried sludge formed after drying from the sludge pipe 123. A discharge valve (not shown) may also be provided at the sludge outlet 127 to control the discharge of the dried sludge formed after drying. Wet sludge having a high water content enters the sludge pipe 123 of the drum 121 from the sludge inlet 126, moves from the high end side to the low end side in the sludge pipe 123, and is finally discharged from the sludge outlet 127. A plurality of corner plates 128 having an inclination are provided on the inner wall of the sludge pipe 123. In a preferred embodiment, the plurality of corner plates 128 are uniformly distributed along the axial direction of the sludge pipe 123 on the inner wall of the sludge pipe 123 (i.e., the projections of the central axis of the sludge pipe 123 are equally spaced apart from each other or are distributed end to end); it is further preferable that the plurality of corner plates 128 are also uniformly distributed on the inner wall of the sludge pipe 123 along the circumferential direction of the sludge pipe 123 at the same time (i.e., at the same angle between two by two on the projection of the slit circular surface of the sludge pipe 123). For example, when there are three corner plates 128, the three corner plates 128 are disposed on the inner wall of the sludge pipe 123 at the same interval or end to end between the projections of the central axis of the sludge pipe 123, and form an angle of 120 ° between the projections of the longitudinal circular surfaces of the sludge pipe 123. The angle plate 128 may have an inclination of 30 to 60. The inclination of the gusset 128 refers to the angle of the gusset 128 from the horizontal. Setting the angle plate on the inner wall of the sludge pipe 123 can make the sludge carried up in the process of the rotation of the roller 121, and throw the sludge down after the sludge rises to a certain angle/height, so that the sludge can obtain sufficient heat from the steam to dry the sludge, and meanwhile, the sludge can also move from the high end side to the low end side of the roller 121 under the driving of the angle plate.

In actual use, the wet sludge moves from the high end side to the low end side in the sludge pipe 123, and the hot steam moves from the low end side to the high end side of the steam jacket 122, that is, the movement directions of the wet sludge and the hot steam are opposite, so that the heat utilization efficiency can be improved. Specifically, the wet sludge enters the sludge pipe 123 from the sludge inlet 126 located at the high end side of the drum 121, and the sludge pipe 123 is rotated by the power device, so that the wet sludge drops and turns after rising to a certain height along with the rotation of the sludge pipe 123, and receives the heat of the hot steam opposite to the moving direction of the wet sludge entering the steam jacket 122 from the steam inlet 124 at the low end side of the drum 121, thereby accelerating the drying heat transfer. In the drying process of wet sludge, since the plurality of corner plates 128 are provided on the inner wall of the sludge pipe 123, the sludge can be dehydrated and dried while moving toward the lower end side of the drum 121 by the heat provided by the angled corner plates 128 and the hot steam. By adjusting the rotational speed of the drum 121 (i.e., the rotational speed of the sludge pipe 123), the drying time of the sludge in the drum 121 can be adjusted, and the faster the rotational speed of the drum 121, the shorter the drying time of the sludge in the drum 121, and the higher the water content after drying, and conversely the lower the water content of the sludge. Accordingly, the flow rate of the thermal steam and the rotation speed of the drum 121 may be set according to the moisture content of the wet sludge and the moisture content of the target outlet sludge (i.e., the moisture content of the dry sludge discharged from the sludge outlet 127 of the drum 121). In practical application, the steam can be the extraction steam from the steam turbine, and the two-extraction steam extraction is more economical and suitable.

The grinder 2 is used for grinding the sludge dried by the dryer 1 so that the dried sludge is ground into particles to facilitate the subsequent combustion process. The dried sludge may be transported to the grinder 2 by using a conveyor belt or by means of a pipe depending on the self weight of the sludge, which is not particularly limited in the present invention, as long as the dried sludge can be transported to the grinder 2. After grinding treatment by the grinder 2, the dry sludge can form dry sludge particles with the particle size of 1 mm-10 mm.

In a preferred embodiment, as shown in fig. 4, the dry sludge granules formed after the grinding process by the grinder 2 are first stored in the dry sludge bin 7 and, when necessary, are fed to the burner 3 by the feeding means for combustion.

Referring to fig. 4, the feeding device includes a screw feeder 81 and a screw feeder 82. The dry sludge hopper 7 may be disposed above a feed inlet of the screw feeder 81. The discharge port of the screw feeder 81 is connected to the feed port of the screw feeder 82.

The burner 3 is used to provide combustion conditions for the dry sludge particles so that the dry sludge particles are fully combusted. The burner 3 can disperse the dry sludge particles as uniformly as possible into the furnace of the incinerator 4 and allow the dry sludge particles to be sufficiently mixed with air. The burner 3 is positioned in the furnace of the incinerator 4 above the fire grate 5.

In a preferred embodiment, as shown in fig. 4, the discharge port of the screw feeder 82 is connected to the feed port of the burner 3, and the compressed air inlet 33 is provided at the feed port of the burner 3. When the screw feeder 82 delivers the dry sludge particles to the feed port of the burner 3, compressed air is injected into the burner 3 from the compressed air inlet 33, and the dry sludge particles are sufficiently mixed with air and delivered to the outlet of the burner 3 for combustion.

The incinerator 4 has a hearth that provides a combustion site for household garbage and dry sludge. The incinerator 4 may be a garbage incinerator, for example, a garbage incinerator for incinerating household garbage. The furnace chamber of the incinerator 4 is provided with a fire grate 5. The fire grate 5 is distributed in a step shape and can be divided into 3-5 sections and is obliquely arranged, and each section is provided with a plurality of furnace sheets; in general, a plurality of furnace slices are arranged in a manner of sequentially decreasing the height along the direction from the feed inlet to the slag outlet of the incinerator 4, thereby forming a stepped shape.

In actual use, household garbage burns on the fire grate 5, and dry sludge particles are just above flame burning the household garbage after being sprayed out by the burner 3, so that the dry sludge particles with smaller particles and lighter particles are heated quickly by hot flue gas, the dry sludge particles with larger particles and heavier particles are heated, crushed and burned by releasing combustible gas in the descending process, and unburned dry sludge particles descend to the fire grate 5 to burn together with the household garbage. The dry sludge particles have small particle size and small proportion of fixed carbon, so the dry sludge can be quickly burnt out.

In a preferred embodiment, the burner 3 may be provided in two rows, a first row 31 and a second row 32 of burners, respectively. The first-row burner 31 and the second-row burner 32 are each provided with a plurality of burners in parallel. Wherein the first row of burners 31 is located upstream of the grate 5 (at a higher position on the grate 5) and the second row of burners 32 is located downstream of the grate 5 (at a lower position on the grate 5). Further preferably, a screening device (not shown) may be provided to screen the dry sludge particles formed after grinding and send the dry sludge particles having a larger particle size to the first row of burners 31 and the dry sludge particles having a smaller particle size to the second row of burners 32. Since the dry sludge particles with larger particle size are sprayed from the first row of burners 31 for combustion, and the first row of burners 31 are positioned at the upstream of the fire grate 5, the combustion is carried out for a more sufficient time, so that the combustion degree of the dry sludge particles can be improved, the dry sludge particles with smaller particle size are sprayed from the second row of burners 32 for combustion, and the dry sludge particles with smaller particle size are easy to burn and do not need to burn for a long time, so that the combustion is sprayed from the second row of burners 32 positioned at the downstream of the fire grate 5, and the sufficient combustion of the dry sludge particles can be ensured; in a word, this kind of setting up mode can improve the combustion degree of dry sludge granule greatly, improves combustion efficiency. In response to providing a plurality of burners, a plurality of screw feeders and a plurality of screw feeders may be provided, each burner corresponding to one screw feeder and one screw feeder, to receive dry sludge granules from the dry sludge hopper.

In a preferred embodiment, the burner 3 is arranged below the secondary tuyere 6. The secondary air nozzle 6 is arranged in the hearth of the incinerator 4 and above the fire grate 5, and the secondary air nozzle 6 can spray air into the hearth of the incinerator 4 so as to help the combustible gas volatilized during the combustion of the household garbage to be fully burnt out. Because the burner 3 is arranged below the secondary air nozzle 6, unburned combustible gas volatilized when household garbage burns on the fire grate 5 can burn under the help of air provided by the secondary air nozzle 6, and the heat generated by combustion can just further dry sludge sprayed by the burner 3 as soon as possible, and meanwhile, sufficient oxygen can be provided for combustible gas separated out from the sludge to help combustible components in the sludge burn as soon as possible.

In actual use, the injection rate and quantity of dry sludge particles can be determined according to the combustion conditions in the incinerator 4 to adjust in real time. For example, a plurality of temperature measuring points (for example, a temperature measuring arrangement with 3*3 as a main monitoring point) can be arranged in the hearth of the incinerator 4 to detect the temperature of the hearth, so as to judge the combustion condition in the incinerator (the reference index of the combustion condition in the incinerator is mainly the temperature of the hearth), so as to avoid the lower furnace temperature possibly caused by excessive mixed combustion amount of dry sludge particles and not meet the requirement of the furnace temperature of the household garbage incineration.

In practical application, as the heat value of the household garbage is gradually increased along with the improvement of the life of the people in China, the heat value of the household garbage actually burnt by the incineration line running for ten years or more in China exceeds a design value, that is, if sludge with lower heat value is sprayed to burn and absorb heat, the incineration amount of the household garbage can be increased to a certain extent.

In the prior art, sludge with 75-80% of water content after mechanical dehydration is directly cooperated with household garbage incineration, and the maximum blending combustion cannot exceed 20%, so that the requirements of current technical development and social progress and increasing sludge treatment pressure cannot be met. According to the invention, the water content of the sludge with the water content of 80% is reduced to about 50%, 75% of the water in the sludge with the water content of 80% is removed, and the household garbage synergistic sludge incineration device provided by the invention is combined, so that the blending ratio of the sludge and the household garbage can be increased to more than 50%.

It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.

Claims

1. A domestic waste co-incinerates sludge device, comprising:

a burner positioned within the furnace and above the grate, the burner being configured to disperse dry sludge particles into the furnace of the incinerator and to substantially mix the dry sludge particles with air;

the dryer is a rotary drum dryer for drying sludge by using hot flue gas or a rotary drum dryer for drying sludge by using steam;

the fire grate is distributed in a step shape, is divided into 3-5 sections and is obliquely arranged, and each section is provided with a plurality of furnace sheets;

the furnace sheets are arranged in a mode of sequentially lowering the heights along the direction from the feed inlet to the slag outlet of the incinerator, so that a step shape is formed;

the burner is provided with two rows, namely a first row of burners and a second row of burners;

the burner is arranged below the secondary air nozzle, and the secondary air nozzle is arranged in the hearth of the incinerator and is positioned above the fire grate;

the grinder is used for grinding the sludge subjected to the drying treatment of the dryer, so that the dry sludge is ground into dry sludge particles with the particle size of 1 mm-10 mm;

the dry sludge bin is used for storing dry sludge particles formed after the grinding treatment of the grinder;

the feeding device comprises a screw feeder and a screw feeder; the dry sludge bin is arranged above the feed inlet of the screw feeder, and the discharge outlet of the screw feeder is connected with the feed inlet of the screw feeder; the discharge port of the spiral feeder is connected with the feed port of the burner, and the feed port of the burner is provided with a compressed air inlet.

2. The domestic waste co-incineration sludge device according to claim 1, wherein:

the rotary drum dryer for drying sludge by using hot flue gas comprises a drum, wherein the drum is obliquely arranged and rotatable; the low end side of the roller is provided with a smoke inlet and a sludge outlet, and the high end side of the roller is provided with a smoke outlet and a sludge inlet; a plurality of bevel plates with inclination are arranged on the inner wall of the roller.

3. The domestic waste co-incineration sludge device according to claim 1, wherein:

the rotary drum dryer for drying sludge by using steam comprises a drum, wherein the drum is obliquely arranged and rotatable; the roller is of a double-layer structure and comprises an outer steam sleeve and an inner sludge pipe; the steam sleeve and the sludge pipe are isolated from each other; a steam inlet is arranged at the lower end side of the drum, and is communicated with the steam sleeve so as to send steam into the steam sleeve; a steam outlet is arranged at the high end side of the drum, and is communicated with the steam sleeve so as to discharge steam from the steam sleeve; the high end side of the roller is also provided with a sludge inlet which is communicated with the sludge pipe so as to send wet sludge into the sludge pipe; the lower end side of the roller is also provided with a sludge outlet which is communicated with the sludge pipe so as to discharge the dried sludge formed after drying from the sludge pipe; a plurality of bevel plates with inclination are arranged on the inner wall of the sludge pipe.

4. The domestic waste co-incineration sludge device according to claim 2, wherein:

a discharge valve is arranged at the sludge outlet and used for controlling the discharge of the dried sludge formed after drying;

the plurality of the corner plates are uniformly distributed on the inner wall of the roller along the axial direction of the roller; the plurality of the corner plates are also uniformly distributed on the inner wall of the roller along the circumferential direction of the roller at the same time.

5. A domestic waste co-incineration sludge device as claimed in claim 3, characterised in that:

a discharge valve is further arranged at the sludge outlet and used for controlling discharge of dried sludge formed after drying;

the plurality of the corner plates are uniformly distributed on the inner wall of the sludge pipe along the axial direction of the sludge pipe; the plurality of the corner plates are also uniformly distributed on the inner wall of the sludge pipe along the circumferential direction of the sludge pipe at the same time.

6. The domestic waste co-incineration sludge device according to claim 4 or 5, characterized in that:

the inclination of the plurality of the bevel plates is 30-60 degrees.