CN114956507A

CN114956507A - Sludge treatment method and sludge treatment system

Info

Publication number: CN114956507A
Application number: CN202210617001.5A
Authority: CN
Inventors: 李孟; 于群; 郭超; 胡以朋; 谢金坤; 闫荣杰; 金兆迪
Original assignee: Jereh Environmental Protection Technology Co Ltd
Current assignee: Jereh Environmental Protection Technology Co Ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-08-30
Also published as: CN220364477U

Abstract

The application discloses a sludge treatment method and a sludge treatment system, and relates to the field of solid waste treatment. A sludge treatment system comprising: the system comprises a first drying device, a second drying device and a waste heat recovery device; the first drying device is provided with a heat source inlet, a heat source outlet, a first feeding hole, a first discharging hole and a waste steam outlet; the second drying device is provided with a first cold source inlet, a first cold source outlet, a second feeding hole, a second discharging hole, a first condensate outlet and a first connecting port; the first feed inlet and the second feed inlet are both used for being connected with the material storage bin, the waste heat recovery device is provided with a first air inlet, a first air outlet and a second connector, the first air inlet is connected with the waste steam outlet, and the second connector is connected with the first connector. The method and the device can at least solve the problem of high energy consumption of the current processing mode.

Description

Sludge treatment method and sludge treatment system

Technical Field

The application belongs to the technical field of solid waste treatment, and particularly relates to a sludge treatment method and a sludge treatment system.

Background

Sludge is a by-product of sewage treatment, contains toxic and harmful substances, and needs to be subjected to stabilization, reduction and harmless treatment. With the continuous improvement of the requirements of the environment and relevant regulations, the sludge needs to be dehydrated before final treatment, so as to realize harmless treatment, reduction and resource utilization treatment at the rear end of the sludge.

At present, the sludge is mainly subjected to heat drying treatment by adopting a sectional type combined process. However, the sectional combined process has the problems of limited treatment capacity and the like, and each section of process equipment needs to be externally supplemented with a fresh steam stripping heat supply source, so that the energy consumption is increased.

Disclosure of Invention

The embodiment of the application aims to provide a sludge treatment method and a sludge treatment system, which can at least solve the problems of limited treatment capacity and high energy consumption of the current treatment mode.

In order to solve the technical problem, the present application is implemented as follows:

the embodiment of the application provides a sludge treatment method, which comprises the following steps:

respectively supplying sludge to the first drying device and the second drying device;

drying the sludge by the first drying device;

recovering waste heat in waste steam generated in the drying process of the first drying device through a waste heat recovery device;

and the waste heat recovered by the waste heat recovery device is supplied to the second drying device for sludge drying.

The embodiment of the present application also provides a sludge treatment system, including: the system comprises a first drying device, a second drying device and a waste heat recovery device;

the first drying device is provided with a heat source inlet, a heat source outlet, a first feeding hole, a first discharging hole and a waste steam outlet, the heat source inlet is used for receiving a high-temperature heat source, the heat source outlet is used for discharging a low-temperature heat source after heat exchange, and the first discharging hole is used for discharging dried sludge;

the second drying device is provided with a first cold source inlet, a first cold source outlet, a second feeding hole, a second discharging hole, a first condensate outlet and a first connecting port, the first cold source inlet is used for receiving a low-temperature cold source, the first cold source outlet is used for discharging a high-temperature cold source after heat exchange, the second discharging hole is used for discharging dried sludge, and the first condensate outlet is used for discharging condensate generated in the drying process;

the first feeding hole and the second feeding hole are both used for being connected with a material storage bin so as to supply sludge to the first drying device and the second drying device through the material storage bin respectively;

the waste heat recovery device is provided with a first air inlet, a first air outlet and a second connector, the first air inlet is connected with the waste steam outlet, the first air outlet is used for discharging gas after heat exchange, and the second connector is connected with the first connector, so that a heat exchange medium can flow between the waste heat recovery device and the second drying device.

In the embodiment of the application, the first drying device and the second drying device can be respectively supplied with sludge to realize parallel feeding, and the sludge to be dried (namely, wet sludge) is respectively dried by the first drying device and the second drying device, so that the drying treatment capacity of the sludge can be improved; the waste heat recovery device can recover heat in waste steam generated in the drying process of the first drying device, and the recovered heat is applied to the second drying device, so that the second drying device does not need to be additionally provided with a heat source, the energy loss can be reduced, and the energy-saving effect is achieved. Compared with a sectional type combined process, the sludge treatment capacity can be increased by matching the first drying device with the second drying device, and heat in waste steam generated in the first drying device can be fully utilized to the second drying device, so that the sludge treatment capacity can be increased under the condition of not increasing a new heat source, and the sludge treatment efficiency is improved.

Drawings

FIG. 1 is a schematic view of a sludge treatment system disclosed in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a first drying apparatus disclosed in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a second drying device and a first cooling device disclosed in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a waste heat recovery device disclosed in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a dust removing device disclosed in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a plurality of first drying devices, a plurality of waste heat recovery devices and a second drying device disclosed in the embodiment of the present application;

fig. 7 is a schematic view of the first drying device, the second drying device, the waste heat recovery device, the tail gas condensing device, the water supply pipeline, and other structures disclosed in the embodiment of the present application;

fig. 8 is a first structural schematic diagram of a third gas transmission pipeline and an emergency spray device disclosed in the embodiment of the application;

fig. 9 is a second structural schematic diagram of a third gas transmission pipeline and an emergency spray device disclosed in the embodiment of the application.

Description of reference numerals:

100-a first drying device; 110-heat source inlet; 120-heat source outlet; 130-a first feed port; 140-a first discharge port; 150-a waste vapor outlet;

200-a second drying device; 210 — a first cold source inlet; 220-first cold source outlet; 230-a second feed port; 240-second discharge hole; 250-a first condensate outlet; 260-a first heat exchange medium inlet; 270-a first heat exchange medium outlet;

300-a waste heat recovery device; 310-a first air inlet; 320-a first air outlet; 330-a second heat exchange medium inlet; 340-a second heat exchange medium outlet; 350-a second condensate outlet;

400-a dust removal device; 410-a dust remover; 411-a second air inlet; 412-a second outlet; 413-dust removal cavity; 420-a dust collector; 421-dust collecting cavity; 422-slag discharge port; 430-heat preservation and heat tracing layer;

510-a first cooling device; 520-a second cooling device;

610-a first feeding device; 620-second feeding means; 630-a first discharge device; 640-a second discharge device; 650-online moisture content detection device;

710-a storage bin; 720-storage bin;

810-a first gas line; 820-a second gas transmission pipeline; 821-a first valve; 830-an exhaust line; 831-fan; 840-bypass; 841-third valve; 842-a fourth valve; 850-a third gas transmission pipeline; 851-a second valve;

900-tail gas condensing unit; 910-a third air inlet; 920-a third air outlet; 930-cooling water inlet; 940-cooling water outlet; 950-a water outlet;

1000-water supply line; 1001-water pump; 1002-a fifth valve; 1003-water supply pipe;

1100-emergency spray device; 1101-a spray nozzle; 1102-U-shaped structure; 1103-sixth valve.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

Referring to fig. 1 to 9, an embodiment of the present application discloses a sludge treatment system, which is used for performing drying treatment on wet sludge, a byproduct of sewage treatment, so as to achieve the purpose of reduction and the like. Of course, the sludge treatment system may also be applied to other working conditions, and this is not particularly limited in the embodiments of the present application.

The disclosed sludge treatment system includes a first drying device 100, a second drying device 200, and a waste heat recovery device 300. The first drying device 100 and the second drying device 200 are both used for drying wet sludge to remove at least part of moisture in the wet sludge so as to achieve the purpose of reducing the moisture content; the waste heat recovery device 300 is used for recovering heat in waste steam generated in the drying process of the first drying device 100, so that the heat can be conveniently applied to the second drying device 200, the heat requirement required by the drying process of the second drying device 200 can be met, and no additional heating source is needed in the drying process of the second drying device 200.

Referring to fig. 2, the first drying device 100 has a heat source inlet 110, a heat source outlet 120, a first feed inlet 130, a first discharge outlet 140, and a waste vapor outlet 150, wherein the heat source inlet 110 is configured to receive a high-temperature heat source so as to supply heat for a drying process of the first drying device 100, and after entering the first drying device 100 through the heat source inlet 110, the high-temperature heat source exchanges heat with wet sludge in the first drying device 100 to heat the wet sludge and evaporate water therein; the heat source outlet 120 is configured to discharge the heat-exchanged low-temperature heat source, specifically, the heat-exchanged low-temperature heat source may be discharged through the heat source outlet 120. Based on the arrangement, heat can be supplied to the drying process by heat exchange between the heat source and the wet sludge, so that the heat requirement for drying treatment in the first drying device 100 can be met.

Alternatively, the heat source may be a high-temperature gas, such as saturated steam, or the like, and of course, the heat source may also be a medium, such as a high-temperature liquid, so as to supply the first drying device 100 with heat required by the drying process.

Here, the high temperature and the low temperature are relatively high temperature and relatively low temperature, respectively, that is, the temperature of the high temperature heat source is higher than that of the low temperature heat source.

The first inlet 130 is used for receiving sludge to be dried, i.e., wet sludge, and the first outlet 140 is used for discharging dried sludge. Based on this, after the wet sludge enters the first drying device 100 through the first feeding hole 130, the wet sludge exchanges heat with a high-temperature heat source introduced into the first drying device 100 to heat the wet sludge, so that part of substances in the wet sludge are evaporated to form waste steam, the waste steam is discharged through the waste steam outlet 150, and the residual sludge after drying treatment is discharged through the first discharging hole 140, so as to facilitate collection or treatment, and prevent the sludge from being discharged randomly to pollute the environment.

It should be noted here that, in order to realize heat exchange between the heat source and the sludge, the first drying device 100 may include a drying cavity and a heat exchange cavity, and the heat exchange cavity is enclosed outside the drying cavity, wherein the heat source inlet 110 and the heat source outlet 120 are all communicated with the heat exchange cavity, and the first feed inlet 130, the first discharge outlet 140 and the waste vapor outlet 150 are all communicated with the drying cavity, so that indirect heat exchange may be performed between the heat source in the heat exchange cavity and the wet sludge in the drying cavity, so as to realize drying treatment of the wet sludge.

Referring to fig. 3, the second drying apparatus 200 has a first cool source inlet 210, a first cool source outlet 220, a second feed inlet 230, a second discharge outlet 240, a first condensed water outlet 250, and a first connection port. The second feeding hole 230 is configured to receive sludge to be dried, that is, wet sludge, and the second discharging hole 240 is configured to discharge dried sludge, so that the wet sludge can be dried by the second drying device 200 to remove part of substances, such as water, in the wet sludge, thereby achieving the purpose of reducing the sludge.

Further, the first feeding port 130 and the second feeding port 230 are both used for being connected with the storage bin 710 so as to supply sludge to the first drying device 100 and the second drying device 200 through the storage bin 710 respectively. On the basis, the parallel feeding of the first drying device 100 and the second drying device 200 can be realized, so that the drying treatment process can be simultaneously carried out on the sludge through the first drying device 100 and the second drying device 200, the sludge treatment capacity can be increased, and the drying efficiency of the sludge can be improved.

The first cool source inlet 210 is used for receiving a low temperature cool source, and the first cool source outlet 220 is used for discharging a high temperature cool source after heat exchange. Specifically, the wet sludge in the second drying device 200 is heated and evaporated after exchanging heat with the heat exchange medium to form water vapor, and the water vapor exchanges heat indirectly with the low-temperature cold source entering through the first cold source inlet 210, at this time, the water vapor is cooled to form condensed water, and the condensed water is discharged through the first condensed water outlet 250, so that the water content of the sludge can be reduced; meanwhile, the heat-exchanged high-temperature cold source can be discharged out of the second drying device 200 through the first cold source outlet 220, so as to be recycled.

It should be noted here that the high-temperature cold source and the low-temperature cold source can be both understood as a relatively high-temperature cold source and a relatively low-temperature cold source, that is, the temperature of the high-temperature cold source is higher than that of the low-temperature cold source, so as to indicate that the cold source is heated due to heat exchange between the cold source and the wet sludge in the second drying device 200. In addition, the cold source can directly exchange heat with the circulating hot air, so that the water vapor in the circulating hot air is cooled and condensed to form condensed water, and the condensed water is discharged through the first condensed water outlet 250, thereby realizing the drying treatment of the sludge.

Referring to fig. 4, the waste heat recovery device 300 has a first air inlet 310, a first air outlet 320, and a second connection port. The first air inlet 310 is connected to the waste vapor outlet 150, so that waste vapor generated in the first drying device 100 sequentially enters the waste heat recovery device 300 through the waste vapor outlet 150 and the first air inlet 310, and heat in the waste vapor generated by the drying treatment of the first drying device 100 is recovered and reused, thereby saving energy. Alternatively, the first gas inlet 310 and the waste vapor outlet 150 may be directly connected or indirectly connected through a pipe, in short, as long as the first gas inlet 310 and the waste vapor outlet 150 can be communicated to transfer the waste vapor. First gas outlet 320 is used for discharging the gas after the heat transfer, specifically, the exhaust steam forms the comdenstion water after meeting cold cooling, and the comdenstion water can be discharged, for example, discharges through second comdenstion water export 350 etc. in addition, still contains noncondenstion gas in the exhaust steam, and at this moment, noncondenstion gas can be discharged via first gas outlet 320.

Further, the first connection port is connected to the second connection port, so that the heat exchange medium can flow in front of the waste heat recovery device 300 and the second drying device 200, thereby realizing heat transmission. It should be noted here that the first connection port may be one or more, and accordingly, the second connection port may also be one or more.

In some embodiments, when both the first connection port and the second connection port are the same, the heat exchange medium near the waste heat recovery device 300 continuously recovers heat from the waste vapor generated by the first drying device 100, and the heat exchange medium near the second drying device 200 continuously consumes heat, so that the heat exchange medium near the waste heat recovery device 300 and the heat exchange medium near the second drying device 200 flow relatively and perform heat exchange, and thus heat can be continuously transmitted to the second drying device 200 through the heat exchange medium, so as to meet the requirement of heat required for drying.

In other embodiments, when the first connection port and the second connection port are both multiple, a heat exchange medium can be circulated between the waste heat recovery device 300 and the second drying device 200, so as to achieve heat transfer. Alternatively, the second drying device 200 may have two first connection ports, which are the first heat exchange medium inlet 260 and the first heat exchange medium outlet 270, respectively, and correspondingly, the waste heat recovery device 300 may have two second connection ports, which are the second heat exchange medium inlet 330 and the second heat exchange medium outlet 340, respectively, and the first heat exchange medium inlet 260 is connected to the second heat exchange medium outlet 340, and the first heat exchange medium outlet 270 is connected to the second heat exchange medium inlet 330.

Based on the above, after the high-temperature heat exchange medium enters the second drying device 200 through the first heat exchange medium inlet 260, the high-temperature heat exchange medium exchanges heat with wet sludge in the second drying device 200 to heat the wet sludge to evaporate water, so that the water content of the wet sludge can be reduced; and the low-temperature heat exchange medium formed after heat exchange is discharged through the first heat exchange medium outlet 270. Based on the arrangement, heat can be supplied to the drying process by exchanging heat between the heat exchange medium and the wet sludge, so that the heat requirement for drying treatment in the second drying device 200 can be met.

It should be noted here that the heat exchange medium may also indirectly exchange heat with the sludge in the second drying device 200, specifically, hot air rises from the bottom of the second drying device 200, and exchanges heat between the hot air and the heat exchange medium, and the hot air circularly flows in the inner cavity of the second drying device 200 without being discharged outside, and the hot air contacts with the sludge to be dried, and moisture in the sludge is evaporated, so that the moisture content of the sludge can be reduced. In addition, the temperature of the high-temperature heat exchange medium is higher than that of the low-temperature heat exchange medium.

In order to recover the residual heat in the waste vapor and apply the residual heat to the second drying device 200, in this embodiment, the second heat exchange medium inlet 330 is connected to the first heat exchange medium outlet 270, and the second heat exchange medium outlet 340 is connected to the first heat exchange medium inlet 260. Based on this, the low-temperature heat exchange medium can enter the waste heat recovery device 300 through the second heat exchange medium inlet 330 and exchange heat with the waste steam therein to absorb the waste heat in the waste steam, and the heat exchange medium absorbing the waste heat has a relatively high temperature and is discharged through the second heat exchange medium outlet 340, and then enters the second drying device 200 through the first heat exchange medium inlet 260 to exchange heat with the wet sludge in the second drying device 200, so that the wet sludge is heated and evaporated, and the purpose of reducing the moisture content of the wet sludge can be achieved; meanwhile, the low-temperature heat exchange medium formed after heat exchange is discharged through the first heat exchange medium outlet 270, then enters the waste heat recovery device 300 through the second heat exchange medium inlet 330, exchanges heat with waste steam again to absorb heat and raise the temperature, and in such a cycle, the heat in the waste steam in the waste heat recovery device 300 can be continuously conveyed to the wet sludge in the second drying device 200 through the heat exchange medium, so that sufficient heat can be provided for evaporation of the wet sludge.

Alternatively, the second heat exchange medium inlet 330 and the first heat exchange medium outlet 270, and the second heat exchange medium outlet 340 and the first heat exchange medium inlet 260 may be directly connected or indirectly connected through a pipeline, in short, as long as the communication between the second heat exchange medium inlet 330 and the first heat exchange medium outlet 270, and the communication between the second heat exchange medium outlet 340 and the first heat exchange medium inlet 260 can be realized to transmit the heat exchange medium.

It should be noted here that when there is a sufficient hot water source (70 ℃ to 90 ℃) in the sludge treatment plant, hot water may be used as a heat exchange medium, so that heat in the waste steam is absorbed by the circularly flowing hot water and is transmitted to the drying medium (such as hot air) in the second drying device 200, thereby recovering heat in the waste steam and recycling the recovered heat, and further achieving the purpose of saving energy.

Similarly, when the sludge treatment plant does not have sufficient hot water source (70-90 ℃), the drying medium (such as hot air and the like) in the second drying device 200 can be directly used as a heat exchange medium, and the heat in the waste steam is absorbed by the hot air flowing in a circulating manner, so that the recovery of the heat in the waste steam and the reutilization of the recovered heat can be realized, and the purpose of saving energy can be further achieved.

In the embodiment of the application, the first drying device 100 and the second drying device 200 can be supplied with sludge respectively to realize parallel feeding, and the first drying device 100 and the second drying device 200 can be used for drying wet sludge respectively, so that the drying treatment capacity of sludge can be improved; the waste heat recovery device 300 can recover heat in waste steam generated in the drying process of the first drying device 100 and apply the recovered heat to the second drying device 200, so that the second drying device 200 does not need to be additionally provided with a heat source, the energy loss can be reduced, and the energy-saving effect is achieved. In addition, compared with a sectional type combined process, the treatment capacity of the sludge can be increased by matching the first drying device 100 and the second drying device 200, and the heat in the waste steam generated in the first drying device 100 can be fully utilized to the second drying device 200, so that the treatment capacity of the sludge can be increased under the condition that a new heat source is not added, and the treatment efficiency of the sludge is improved.

Considering that the waste steam contains dust, in order to prevent the dust from blocking the downstream devices, the sludge treatment system may further include a dust removal device 400, in some embodiments, the dust removal device 400 is located between the first drying device 100 and the waste heat recovery device 300, so as to facilitate dust removal treatment of the waste steam, so that the dust may be reduced from entering the waste heat recovery device 300, and further, the waste heat recovery device 300 may be effectively prevented from being blocked by the dust to affect normal operation.

Specifically, the dust removing device 400 has a second air inlet 411 and a second air outlet 412, wherein the second air inlet 411 is connected with the waste vapor outlet 150 through a first air pipeline 810, and the second air outlet 412 is connected with the first air inlet 310 through a second air pipeline 820. Based on this, the waste vapor generated in the drying process of the first drying device 100 enters the first air transmission pipeline 810 through the waste vapor outlet 150, is transmitted to the second air inlet 411 through the first air transmission pipeline 810, and enters the dust removing device 400 through the second air inlet 411, so as to perform the dust removing process in the dust removing device 400, and thus the dust in the waste vapor can be removed to the maximum extent. The waste vapor after dust treatment enters the second air transmission pipeline 820 through the second air outlet 412, is transmitted to the first air inlet 310 through the second air transmission pipeline 820, and enters the waste heat recovery device 300 through the first air inlet 310, so as to recover the heat in the waste vapor through the waste heat recovery device 300.

Based on the above arrangement, the dust content of the waste steam can be reduced through the dust removing device 400, so that the risk of the waste heat recovery device 300 being blocked by dust can be effectively reduced, and the normal operation of the waste heat recovery device 300 is ensured.

Referring to fig. 5, in some embodiments, the dust removing device 400 may include a dust collector 410 and a dust collector 420, wherein the dust collector 410 is used for separating dust in the exhaust steam from the gas, the dust collector 420 is used for collecting the separated dust, and the dust collector 410 is connected to the dust collector 420 so that the dust separated by the dust collector 410 can enter the dust collector 420 for collection.

Specifically, the dust collector 410 may have a dust collecting cavity 413, the second air inlet 411 and the second air outlet 412 are both communicated with the dust collecting cavity 413, the dust collector 420 may have a dust collecting cavity 421, the dust collecting cavity 421 is provided with a slag discharging port 422, and the slag discharging port 422 and the dust collecting cavity 413 are both communicated with the dust collecting cavity 421. Based on this, after the exhaust steam enters the dust removal cavity 413 through the second air inlet 411, dust and gas are separated in the dust removal cavity 413, the exhaust steam after dust removal is discharged through the second air outlet 412, the separated dust enters the dust collection cavity 421 through the dust removal cavity 413, so as to collect the dust through the dust collection cavity 421, thereby, on one hand, the amount of dust carried by the exhaust steam can be reduced, so as to avoid the dust from blocking the downstream waste heat recovery device 300, on the other hand, the dust can be collected, so as to prevent the dust from flying and affecting the environment.

After the dust removing device 400 operates for a period of time, a certain amount of dust is accumulated in the dust collecting cavity 421 and needs to be discharged, and at this time, the slag discharge port 422 can be opened to discharge the dust in the dust collecting cavity 421 through the slag discharge port 422, so that the normal operation of the dust collector 420 is ensured.

In order to prevent the exhaust steam from condensing moisture due to temperature drop in the dust removing device 400, the dust removing device 400 may further include a heat-insulating heat-accompanying layer 430, and the heat-insulating heat-accompanying layer 430 is disposed outside the dust collector 410 and the dust collector 420. Based on this, can make the exhaust steam that gets into in dust collector 400 can maintain in the relatively higher temperature range, slow down the temperature reduction of exhaust steam to can effectively alleviate exhaust steam and lead to moisture to condense in dust collector 400 because of the temperature reduction and influence dust collector 400's normal operating.

Alternatively, the dust removing device 400 may employ a cyclone dust removing device to separate dust by centrifugal force. Of course, other types of dust removing devices 400 are also possible, and the embodiment of the present application is not limited in this respect.

In order to cool the vapor generated in the second drying device 200 to condense into condensed water, the sludge treatment system may further include a first cooling device 510, and the first cold source inlet 210 and the first cold source outlet 220 are both connected to the first cooling device 510. Based on this, the first cooling device 510 can enable the low-temperature cold source to enter the second drying device 200 through the first cold source inlet 210, so that the low-temperature cold source exchanges heat with the steam generated in the second drying device 200, thereby condensing the moisture in the steam to form condensed water, and the condensed water is discharged through the first condensed water outlet 250; the heat-exchanged high temperature cold source is discharged through the first cold source outlet 220 and enters the first cooling device 510. So circulate, provide the cold source for second mummification device 200 constantly through first cooling device 510 to can be convenient for cool down the dehumidification to the vapour in the second mummification device 200, improve the mummification treatment effect to mud. It should be noted here that the high temperature and the low temperature are relative, and are not absolutely high temperature or absolutely low temperature, that is, the temperature of the high temperature heat sink is higher than that of the low temperature heat sink.

Optionally, the first cooling device 510 may provide cooling water for the second drying device 200, so as to cool and dehumidify the vapor in the second drying device 200 by the cooling water. Of course, the heat sink can also be another medium.

In some embodiments, the sludge treatment system may further include a first discharging device 630 and a first cooling device 510, wherein a feeding end of the first discharging device 630 is connected to the first discharging port 140, so that dried sludge in the first drying device 100 can be discharged to the first discharging device 630 through the first discharging port 140 and conveyed by the first discharging device 630, so that the dried sludge is conveyed to a preset position, and the sludge is prevented from being discharged randomly to pollute the environment.

Alternatively, the first discharging device 630 may be a belt conveyor, and of course, other devices may also be used, which is not specifically limited in this embodiment of the application.

Considering that the sludge discharged from the first discharge port 140 after being dried in the first drying apparatus 100 may have a relatively high temperature, in this case, smoldering is likely to occur, so that the sludge discharged from the first discharge port 140 needs to be cooled to avoid smoldering.

In view of the above problem, in some embodiments, the first discharging device 630 may have a second cool source inlet (not shown) and a second cool source outlet (not shown), and the second cool source inlet and the second cool source outlet are connected to the first cooling device 510. Based on this, the first cooling device 510 can enable the low-temperature cold source to enter the first discharging device 630 through the second cold source inlet, so that the low-temperature heat source exchanges heat with the sludge conveyed by the first discharging device 630, thereby reducing the temperature of the sludge and avoiding smoldering phenomenon caused by high temperature; and the high-temperature cold source after heat exchange is discharged through the second cold source outlet and enters the first cooling device 510. Circulating like this, continuously providing the cold source for first discharging device 630 through first cooling device 510 to can be convenient for cool down the mud that first discharging device 630 carried, in order to avoid smoldering. It should be noted here that the high temperature and the low temperature are relative, and are not absolutely high temperature or absolutely low temperature, that is, the temperature of the high temperature heat sink is higher than that of the low temperature heat sink.

Generally, the discharging temperature is 80-95 ℃, certain smoldering risk exists, the cold source is transmitted to the first discharging device 630 through the first cooling device 510 to reduce the temperature of the sludge, so that the discharging temperature is reduced to 40-50 ℃, and the smoldering risk caused by overhigh discharging temperature can be effectively avoided.

In order to discharge the sludge dried by the second drying device 200, the sludge treatment system may further include a second discharging device 640, wherein a feeding end of the second discharging device 640 is connected to the second discharging hole 240, so that the dried sludge in the second drying device 200 can be discharged to the second discharging device 640 through the second discharging hole 240 and conveyed by the second discharging device 640, and the dried sludge is conveyed to a preset position, so as to prevent the sludge from being discharged at will to pollute the environment.

In order to collect the dried sludge, the sludge treatment system may further include a storage bin 720, and the storage bin 720 may be connected to the discharge end of the first discharging device 630 or the discharge end of the second discharging device 640. Based on this, the sludge dried by the first drying device 100 can be conveyed to the storage bin 720 for storage through the first discharging device 630, and the sludge dried by the second drying device 200 can be conveyed to the storage bin 720 for storage through the second discharging device 640, so that the influence on the environment due to the random discharge of the sludge can be effectively prevented, and the purpose of protecting the environment is achieved.

In some embodiments, the sludge treatment system may further include a storage bin 710, the storage bin 710 for storing wet sludge to be dried. Alternatively, the moisture content of the wet sludge in the storage bin 710 may be 80-85%.

In order to convey wet sludge to the first drying device 100, the sludge treatment system may further include a first feeding device 610, a feeding end of the first feeding device 610 is connected to the storage bin 710, and a discharging end of the first feeding device 610 is connected to the first feeding hole 130. Based on this, the wet sludge in the storage bin 710 can be conveyed to the first drying device 100 through the first feeding device 610, so as to be dried. Alternatively, the first feeding device 610 may be a belt conveyor, so as to achieve the transport of the wet sludge.

In order to convey wet sludge to the second drying device 200, the sludge treatment system may further include a second feeding device 620, a feeding end of the second feeding device 620 is connected to the storage bin 710, and a discharging end of the second feeding device 620 is connected to the second feeding hole 230. Based on this, the wet sludge in the storage bin 710 can be conveyed to the second drying device 200 through the second feeding device 620, so as to be dried. Alternatively, the second feeding device 620 may be a belt conveyor, so as to achieve the conveyance of the wet sludge.

Considering that the waste steam contains a large amount of water, after the waste steam exchanges heat with the heat exchange medium, the water in the waste steam forms condensed water, in order to discharge the condensed water, the waste heat recovery device 300 may have a second condensed water outlet 350, and the condensed water generated in the heat exchange process may be conveniently discharged from the waste heat recovery device 300 through the second condensed water outlet 350, so that it may be effectively alleviated that the condensed water is accumulated in the waste heat recovery device 300 to affect the normal operation of the waste heat recovery device 300.

After heat exchange, most of moisture in the waste steam is basically removed, the rest of the waste steam is non-condensable gas, in order to discharge the non-condensable gas, the sludge treatment system can further comprise an exhaust pipeline 830, the exhaust pipeline 830 is connected with the first air outlet 320, and the exhaust pipeline 830 is provided with a fan 831. Based on this, under the effect of fan 831, can make in the exhaust pipe 830 produce the vacuum to can improve the discharge velocity of noncondensable gas, improve discharge rate, simultaneously, still be favorable to the flow of the useless vapour in first mummification device 100.

In some embodiments, the sludge treatment system may include a plurality of first drying devices 100, and the waste vapor outlets 150 of the plurality of first drying devices 100 are all connected to the first gas inlet 310. Based on this, the waste steam that produces respectively by a plurality of first drying devices 100 all lets in waste heat recovery device 300 and carries out the heat transfer with heat transfer medium to can increase the recovery heat, make heat transfer medium's temperature higher, and then can improve second drying device 200 to the ability of sludge drying processing.

Optionally, the sludge treatment system may include a plurality of waste heat recovery devices 300, in this case, the plurality of waste heat recovery devices 300 are connected to the plurality of first drying devices 100 in a one-to-one correspondence, and the respective second connectors of the plurality of waste heat recovery devices 300 are connected to the plurality of first connectors of the second drying device 200, where the plurality of first connectors may be distributed in a plurality of areas of the second drying device 200. Based on this, heat in the waste steam generated in the drying process of the first drying device 100 correspondingly connected can be recovered by each waste heat recovery device 300, and heat is supplied to a plurality of areas from a plurality of directions of the second drying device 200, so that the drying efficiency of the second drying device 200 on sludge can be improved.

Certainly, the sludge treatment system may further include a waste heat recovery device 300, the plurality of first drying devices 100 are all connected to the waste heat recovery device 300, and heat is supplied to the second drying device 200 through the waste heat recovery device 300 in a centralized manner, so that heat supply is more centralized, and since the plurality of first drying devices 100 share one waste heat recovery device 300, the temperature of a heat exchange medium between the waste heat recovery device 300 and the second drying device 200 may be increased to a certain extent, which is also beneficial to increasing the drying efficiency of the second drying device 200 on sludge.

Further, the plurality of first drying devices 100 may be respectively connected to the waste heat recovery device 300 through transmission pipelines. In order to control the heat recovered by the waste heat recovery device 300, a control valve can be arranged on each transmission pipeline, and the on-off of the corresponding transmission pipeline can be switched through the control valve, so that the number of the first drying devices 100 for recovering the waste heat through the waste heat recovery device 300 can be adjusted, the collected waste heat quantity can be controlled, the adjustment of the heat supply quantity of the second drying device 200 is realized, and the requirements of various different working conditions are met.

In order to realize automatic control of the recovered waste heat, a temperature sensor may be disposed in the second drying device 200, and the temperature sensor and a control valve on a transmission pipeline connected to the plurality of first drying devices 100 are all in signal connection with a control element. Based on this, the temperature in the second drying device 200, for example, the temperature of the sludge or the temperature of the internal environment of the second drying device 200, can be detected in real time through the temperature sensor, and the detected temperature signal is sent to the control element, the control element compares the detected temperature with the first preset temperature (i.e., the temperature set under a certain working condition), when the detected temperature is higher than the first preset temperature, the control element controls a part of the control valves to be closed, so that a part of the transmission pipeline is cut off, and therefore the waste heat recovery device 300 does not recover the heat in the first drying device 100 correspondingly connected with the part of the transmission pipeline, and further the heat supply amount to the second drying device 200 can be reduced, so as to prevent the temperature in the second drying device 200 from being too high and not meeting the drying requirement. In contrast, when the detected temperature is lower than the second preset temperature (i.e., the temperature set under another working condition), the control element controls more control valves to open, so that the waste heat recovery device 300 can recover the waste heat of more first drying devices 100 and supply the recovered waste heat to the second drying device 200, thereby raising the temperature in the second drying device 200 to prevent the temperature from being too low to meet the drying requirement.

Based on the setting, the automatic adjustment and control of the temperature in the second drying device 200 can be realized, so that the requirements of more drying processes on the temperature can be met, and the applicability of the sludge treatment system can be improved.

In some embodiments, the first drying device 100 may include at least one of a paddle dryer, a disc dryer, and a thin layer dryer. In a specific embodiment, a disc dryer can be selected, so that the drying efficiency can be ensured, and the waste heat recovery can be ensured, thereby achieving the purpose of saving energy. Besides, the first drying apparatus 100 may be of other types, and the embodiment of the present application is not particularly limited in this respect.

In addition, the second drying device 200 may be a waste heat type low temperature belt drying machine, which can fully utilize the waste heat in the waste steam generated by the first drying device 100, thereby reducing energy waste and being beneficial to energy saving.

It should be noted that the specific structures and operating principles of the paddle dryer, the disc dryer, the thin layer dryer and the waste heat type low temperature belt dryer can refer to the prior art, and are not described in detail herein.

In the embodiment of the present application, when the waste heat recovery device 300 fails, in the process of repairing the waste heat recovery device, although the second drying device 200 is temporarily stopped, the front-end first drying device 100 still normally operates, which may affect the repair of the waste heat recovery device 300.

To solve the above problem, the sludge treatment system may further include a bypass 840, a third gas transmission pipeline 850, and a tail gas condensing unit 900, as shown in fig. 7. The tail gas condensing device 900 is connected to the exhaust pipe 830, the third gas pipe 850 is connected between the waste heat recovery device 300 and the tail gas condensing device 900, one end of the bypass 840 is connected to the upstream of the waste heat recovery device 300, and the other end of the bypass 840 is connected to the downstream of the waste heat recovery device 300.

When the waste heat recovery device 300 fails, the first valve 821 and the second valve 851 are closed to ensure that the waste heat recovery device 300 does not enter waste steam in the maintenance process, and the third valve 841 and the fourth valve 842 are opened to ensure that the waste steam enters the tail gas condensation device 900 through the bypass 840 and the third gas pipeline 850.

In addition, referring to fig. 7 to 9, the third gas transmission pipeline 850 is provided with an emergency spray device 1100, tap water passes through a control water pump 1001 of the water supply pipeline 1000 and a switch of a fifth valve 1002, the emergency spray device 1100 directly contacts with waste steam in the third gas transmission pipeline 850 through a water supply pipe 1003 for cooling and condensing, the condensed water generated here realizes the discharge of the condensed water by controlling a switch of a sixth valve 1103, and when more steam is generated after the water is discharged from the water transmission pipeline, the sixth valve 1103 is immediately closed, so that the waste steam cannot be discharged into the environment.

In order to ensure that the tail gas condenser 900 can further condense the waste vapor and the amount of condensed water entering the tail gas condenser 900 is small, and the waste vapor cannot enter the environment, a "U-shaped" structure 1102 is arranged on one side of the third gas transmission pipeline 850, which is close to the tail gas condensing device 900, so that the condensed water can be ensured to form a "water seal" through the "U-shaped" structure, and the waste vapor cannot enter the environment through the sixth valve 1103 and the water discharge pipeline, as shown in fig. 8. To ensure durability and better view drainage, the "U-shaped" structure 1103 can be made of a thickened transparent material.

Referring to fig. 8 and 9, the emergency spray device 1100 may include one or more spray nozzles 1101 to ensure the cooling, condensing and dehydrating effects on the exhaust steam, so as to ensure that the exhaust steam after emergency condensation can satisfy the processing capacity of the exhaust gas condenser 900. The waste steam after emergency spraying enters through the third air inlet 910, cooling water enters the tail gas condenser 900 through the second cooling device 520 through the cooling water inlet 930 and indirectly contacts with the waste steam for heat exchange, the saturation of the waste steam is reduced while the temperature of the waste steam is reduced, a large amount of moisture in the waste steam can be removed, generated condensed water is discharged through the water discharge port 950, the rest waste steam is discharged to a subsequent gas treatment system through the third air outlet 920 under the action of the fan 831, and the heated cooling water is discharged through the cooling water outlet 940 and enters the second cooling device 520 through a pipeline for cooling and recycling.

In order to ensure the treatment effect of the second drying device 200, the moisture content of the fed material is mostly detected by manual sampling when the sludge enters the wet sludge bin, and an online moisture content detection device 650 is arranged at the discharging position. Taking the water content of the fed material as 78-85% as an example, when the water content of the discharged material fluctuates at 38-43%, the operation frequency of the second feeding device 620 does not need to be adjusted; when the moisture content of the discharged material is higher than 43%, the operation frequency of the second feeding device 620 needs to be reduced, and the processing capacity of the second drying device 200 needs to be reduced; when the moisture content of the discharged material is lower than 38%, the processing capacity of the first drying device 100 needs to be increased.

With reference to fig. 1 to 9, the present application further discloses a sludge treatment method, which can be applied to the sludge treatment system, and the disclosed sludge treatment method includes:

supplying sludge to the first drying device 100 and the second drying device 200, respectively;

drying the sludge by a first drying device 100;

recovering waste heat in waste steam generated in the drying process of the first drying device 100 through a waste heat recovery device 300;

the waste heat recovered by the waste heat recovery device 300 is supplied to the second drying device 200 for sludge drying.

In some embodiments, the first feeding hole 130 of the first drying device 100 and the second feeding hole 230 of the second drying device 200 may be connected to the storage bin 710, so that the storage bin 710 may respectively supply the first drying device 100 and the second drying device 200 with sludge, and parallel feeding is implemented to increase the sludge treatment capacity and further improve the drying efficiency of the sludge.

In addition, the waste heat recovery device 300 can also be used for recovering the waste heat in the waste steam generated in the drying process of the first drying device 100 and applying the recovered waste heat to the second drying device 200 so as to provide heat for the drying process of the second drying device 200, so that the utilization rate of energy can be improved, the waste can be reduced, and the purpose of saving energy can be achieved.

Optionally, the heat generated by the second drying device 200 for drying the sludge comes only from the waste heat recovered by the waste heat recovery device 300.

Specifically, the second drying device 200 may have a first connection port, the waste heat recovery device 300 may have a second connection port, and the first connection port is connected to the second connection port, so that waste heat recovered by the waste heat recovery device 300 from waste steam may be conducted through a heat exchange medium flowing between the second drying device 200 and the waste heat recovery device 300, so as to supply heat to the second drying device 200 through the recovered waste heat, so as to dry sludge in the second drying device 200.

Based on the above arrangement, the second drying device 200 in the embodiment of the present application does not need to additionally add a heat source, but only supplies heat through the waste heat recovery device 300, so as to effectively utilize waste heat in waste steam, reduce heat waste, realize recycling of waste heat, reduce the usage amount of the heat source to a certain extent, and further achieve the purpose of saving energy.

Optionally, the number of the first drying devices 100 is multiple, and multiple first drying devices 100 are arranged in parallel;

during the process of drying the sludge by the second drying device 200, at least part of the first drying devices 100 in the plurality of drying devices is controlled according to the feeding parameters of the second drying device 200, or the feeding of the second drying device 200 is controlled according to the discharging parameters of the second drying device 200.

In the sludge treatment process, the plurality of first drying devices 100 arranged in parallel can all convey waste steam to the waste heat recovery device 300, so that the waste heat of at least part of the waste steam generated in the plurality of first drying devices 100 can be recovered through the waste heat recovery device 300.

It is considered that the heat generated by the second drying device 200 for drying the sludge comes from the waste heat recovery device 300, and the heat recovered by the waste heat recovery device 300 comes from at least part of the first drying devices 100. Therefore, according to the feeding parameters of the second drying device 200, such as the feeding amount per unit time, the heat required by the drying treatment of the second drying device 200 can be determined, and further the heat required to be recovered by the waste heat recovery device 300 can be determined; under the condition that the drying parameters are not changed, the heat quantity of the waste steam generated in the drying process of each first drying device 100 is basically equal and is not changed. Further, the amount of heat contained in the waste steam generated in the drying process of each first drying device 100 is mainly determined by the feeding amount of the first drying device 100 under the condition that other drying parameters (such as the supply amount of the heat source, the temperature of the heat source, etc.) are not changed. Therefore, the feeding of the plurality of first drying devices 100 can be controlled according to the heat required by the drying process of the second drying device 200, so as to prevent the normal operation of the sludge treatment process from being influenced by the waste of heat or insufficient heat supply. It should be noted here that the feeding amount of the feeding materials of the plurality of first drying devices 100 may be controlled according to the heat quantity required by the drying process of the second drying device 200, which mainly refers to the feeding amount per unit time, and certainly does not exclude the adjustment of other parameters, such as the feeding water content, the feeding temperature, etc.

In addition, the feeding of the second drying device 200 can be controlled according to the discharging parameters of the second drying device 200, so that the moisture content in the discharged sludge can be maintained in a reasonable range. It should be noted here that the feeding amount of the feeding material of the second drying device 200 may be controlled according to the discharging parameter of the second drying device 200, and the feeding amount is mainly the feeding amount per unit time, and certainly, the adjustment of other parameters, such as the feeding water content, the feeding temperature, etc., is not excluded.

Optionally, controlling the feeding of at least a portion of the first drying apparatus 100 in the plurality according to the feeding parameters of the second drying apparatus 200 comprises:

controlling the start and stop of any one or any several of the plurality of first drying devices 100, or controlling the feeding amount of any one or any several of the plurality of first drying devices 100.

Specifically, when the feeding amount of the second drying device 200 is larger, the amount of heat required for the drying process is larger, and at this time, more first drying devices 100 may be controlled to start up to generate more waste steam, so that the waste heat recovery device 300 may recover more waste heat, so as to supply sufficient heat to the second drying device 200. On the contrary, when the feeding amount of the second drying device 200 is smaller, the required heat is less, and at this time, fewer first drying devices 100 can be controlled to start to generate less waste steam, so that the waste heat recovery device 300 recovers less waste heat, and further, the situation that the moisture content of the sludge dried by the second drying device 200 is too low to discharge or store due to excessive heat can be prevented.

In addition to the above manner, in order to adjust the waste heat recovered by the waste heat recovery device 300, the feeding amount of any one or more of the plurality of first drying devices 100 may be controlled. Specifically, when the amount of heat required by the second drying device 200 is large, more first drying devices 100 may be controlled to increase the feeding amount, so as to generate more waste steam, so that the waste heat recovery device 300 may recover more waste heat, so as to provide sufficient heat for the second drying device 200. Conversely, when the amount of heat required by the second drying device 200 is less, fewer first drying devices 100 may be controlled to increase the feeding amount, or more first drying devices may be controlled to decrease the feeding amount, so as to generate less waste steam, so that the waste heat recovery device 300 may recover less waste heat, so as to prevent the situation of excessive waste heat.

Optionally, controlling the feeding of the second drying apparatus 200 according to the discharge parameters of the second drying apparatus 200 includes:

setting a reference parameter of the discharge of the second drying device 200, comparing the discharge parameter of the second drying device 200 with the reference parameter, and adjusting the feed amount of the second drying device 200 when the deviation range between the discharge parameter of the second drying device 200 and the reference parameter exceeds a preset value.

Based on the above arrangement, when the deviation range between the discharge parameter of the second drying device 200 and the reference parameter is smaller than the preset value, it indicates that the discharge of the second drying device 200 is in a normal state, and at this time, the normal operation of the sludge treatment process can be ensured; on the contrary, when the deviation range between the discharge parameter of the second drying device 200 and the reference parameter exceeds the preset value, it indicates that the discharge of the second drying device 200 is abnormal, and at this time, the operation condition of the second drying device 200 can be adjusted by adjusting the feed rate of the second drying device 200, so that the discharge condition of the second drying device 200 can be adjusted, and the discharge parameter can be returned to the deviation range of the reference parameter.

It should be noted here that the working principle of the second drying apparatus 200 and the automatic adjustment principle thereof can also refer to other related technologies as long as the realization is possible.

Based on the sludge treatment system and the sludge treatment method, the sludge drying method in the embodiment of the application comprises the following specific steps:

the method comprises the steps of continuously conveying sludge with initial water content of 80% -85% to a first drying device 100 and a second drying device 200 respectively for drying treatment, dedusting waste steam generated by the first drying device 100 through a dedusting device 400, recycling waste heat contained in the waste steam by using a waste heat recycling device 300 to provide heat for drying treatment of the second drying device 200, and cooling and dehumidifying hot air in the second drying device 200 by using a first cooling device 510 to improve the drying effect of the hot air on the sludge. The water content of the dried discharged material is 35-45%, and then the discharged material is respectively conveyed to a storage bin 720 for stacking. Wherein, because the ejection of compact temperature of first mummification device 100 is higher relatively, has smoldering risk, cools off the cooling through first cooling device 510 to the mud that first mummification device 100 discharged this moment to prevent smoldering phenomenon. Based on the arrangement, the sludge treatment capacity can be increased under the condition that an external new heat source is not increased; in addition, a plurality of first drying devices 100 can be matched, and more waste steam waste heat can be recovered through the waste heat recovery device 300 to supply heat to the second drying device 200, so that the sludge treatment capacity can be increased.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A sludge treatment method, characterized in that the sludge treatment method comprises:

respectively supplying sludge to the first drying device (100) and the second drying device (200);

drying the sludge by the first drying device (100);

recovering waste heat in waste steam generated in the drying process of the first drying device (100) through a waste heat recovery device (300);

the waste heat recovered by the waste heat recovery device (300) is supplied to the second drying device (200) for sludge drying.

2. The sludge treatment method according to claim 1, wherein the heat generated by the second drying device (200) for drying the sludge comes only from the residual heat recovered by the residual heat recovery device (300).

3. The sludge treatment method according to claim 2, wherein the first drying device (100) is provided in plurality, and a plurality of the first drying devices (100) are provided in parallel;

during the drying treatment of the sludge by the second drying device (200), controlling the feeding of at least part of the first drying devices (100) in the plurality of drying devices according to the feeding parameters of the second drying device (200);

or controlling the feeding of the second drying device (200) according to the discharge parameters of the second drying device (200).

4. The sludge treatment method according to claim 3, wherein the controlling of the feeding of at least part of the first drying devices (100) in a plurality of drying devices (200) according to the feeding parameters of the second drying device comprises:

and controlling the start and stop of any one or any several of the first drying devices (100), or controlling the feeding amount of any one or any several of the first drying devices (100).

5. The sludge treatment method according to claim 3, wherein the controlling of the feeding of the second drying device (200) according to the discharge parameter of the second drying device (200) comprises:

setting a reference parameter of the discharge of the second drying device (200), comparing the discharge parameter of the second drying device (200) with the reference parameter, and adjusting the feeding amount of the second drying device (200) when the deviation range between the discharge parameter of the second drying device (200) and the reference parameter exceeds a preset value.

6. A sludge treatment system, comprising: the system comprises a first drying device (100), a second drying device (200) and a waste heat recovery device (300);

the first drying device (100) is provided with a heat source inlet (110), a heat source outlet (120), a first feeding hole (130), a first discharging hole (140) and a waste steam outlet (150), wherein the heat source inlet (110) is used for receiving a high-temperature heat source, the heat source outlet (120) is used for discharging a low-temperature heat source after heat exchange, and the first discharging hole (140) is used for discharging dried sludge;

the second drying device (200) is provided with a first cold source inlet (210), a first cold source outlet (220), a second feeding hole (230), a second discharging hole (240), a first condensate outlet (250) and a first connecting port, the first cold source inlet (210) is used for receiving a low-temperature cold source, the first cold source outlet (220) is used for discharging a high-temperature cold source after heat exchange, the second discharging hole (240) is used for discharging dried sludge, and the first condensate outlet (250) is used for discharging condensate generated in the drying process;

the first feeding hole (130) and the second feeding hole (230) are connected with a storage bin (710) so as to supply sludge to the first drying device (100) and the second drying device (200) through the storage bin (710);

waste heat recovery device (300) have first air inlet (310), first gas outlet (320) and second connector, first air inlet (310) with exhaust steam outlet (150) are connected, first gas outlet (320) are used for discharging the gas after the heat transfer, the second connector with first interface connection to make heat transfer medium can waste heat recovery device (300) with flow between second mummification device (200).

7. The sludge treatment system of claim 6, further comprising a dust removal device (400);

the dust removing device (400) is provided with a second air inlet (411) and a second air outlet (412), the second air inlet (411) is connected with the waste steam outlet (150) through a first air conveying pipeline (810), and the second air outlet (412) is connected with the first air inlet (310) through a second air conveying pipeline (820).

8. The sludge treatment system of claim 7 wherein the dust removal device (400) comprises a connected dust collector (410) and a dust collector (420);

the dust collector (410) is provided with a dust collecting cavity (413), the second air inlet (411) and the second air outlet (412) are both communicated with the dust collecting cavity (413), the dust collector (420) is provided with a dust collecting cavity (421), the dust collecting cavity (421) is provided with a slag discharge port (422), and the slag discharge port (422) and the dust collecting cavity (413) are both communicated with the dust collecting cavity (421);

and/or the dust removal device (400) further comprises a heat-insulating heat-tracing layer (430), wherein the heat-insulating heat-tracing layer (430) is arranged on the outer sides of the dust remover (410) and the dust collector (420).

9. The sludge treatment system of claim 6 further comprising a first cooling device (510);

the first cool source inlet (210) and the first cool source outlet (220) are both connected to the first cooling device (510).

10. The sludge treatment system of claim 6, further comprising a first discharging device (630) and a first cooling device (510), wherein the feeding end of the first discharging device (630) is connected with the first discharging port (140), the first discharging device (630) is provided with a second cold source inlet and a second cold source outlet, and the second cold source inlet and the second cold source outlet are both connected with the first cooling device (510);

and/or the sludge treatment system further comprises a second discharging device (640) and a storage bin (720), the feeding end of the second discharging device (640) is connected with the second discharging hole (240), the discharging end of the second discharging device (640) is connected with the storage bin (720), and the first discharging hole (140) is connected with the storage bin (720).

11. The sludge treatment system of claim 6, wherein the sludge treatment system comprises a plurality of the first drying devices (100), and the waste vapor outlets (150) of the plurality of the first drying devices (100) are connected to the first gas inlet (310).

12. The sludge treatment system according to claim 6, wherein the second drying device (200) has two first connection ports, namely a first heat exchange medium inlet (260) and a first heat exchange medium outlet (270);

the waste heat recovery device (300) is provided with two second connecting ports which are respectively a second heat exchange medium inlet (330) and a second heat exchange medium outlet (340);

the first heat exchange medium inlet (260) is connected with the second heat exchange medium outlet (340), and the first heat exchange medium outlet (270) is connected with the second heat exchange medium inlet (330).

13. The sludge treatment system of claim 6, further comprising a first feeding device (610), wherein the feeding end of the first feeding device (610) is connected with the storage bin (710), and the discharging end of the first feeding device (610) is connected with the first feeding port (130);

and/or the sludge treatment system further comprises a second feeding device (620), wherein the feeding end of the second feeding device (620) is connected with the storage bin (710), and the discharging end of the second feeding device (620) is connected with the second feeding hole (230).

14. The sludge treatment system of claim 6 wherein the waste heat recovery device (300) further has a second condensed water outlet (350) for discharging condensed water produced during heat exchange;

and/or, the sludge treatment system also comprises an exhaust pipeline (830), the exhaust pipeline (830) is connected with the first air outlet (320), and the exhaust pipeline (830) is provided with a fan (831).