阅读说明：本技术 一种水泥窑协同处置生活垃圾及污泥系统 (Cement kiln is dealt with domestic waste and mud system in coordination ) 是由 龙吉生 乔旭 瞿兆舟 张利军 李建平 黄立成 倪鲲鹏 严浩文 张坡 袁旗斌 于 2021-07-09 设计创作，主要内容包括：本发明提供了一种水泥窑协同处置生活垃圾及污泥系统,所述系统包括：垃圾焚烧单元,通过其输出烟道提供高温烟气；污泥处理单元；水泥分解单元,连接在所述输出烟道上,在所述高温烟气下进行水泥生产；烟气再循环单元,设置在所述输出烟道和所述污泥处理单元之间,为所述污泥处理单元提供所述高温烟气作为热源。本发明利用水泥窑协同处置生活垃圾工艺,利用烟气余热低温处理污泥,进一步将处理后的污泥送至垃圾焚烧炉内焚烧,既节省了高昂的建设和运行成本,又同时实现对污泥和生活垃圾的减量化、无害化、资源化处理,经济效益、社会效益和环境效益具有明显优势。(The invention provides a system for cooperatively treating household garbage and sludge by a cement kiln, which comprises: the waste incineration unit provides high-temperature flue gas through an output flue thereof; a sludge treatment unit; the cement decomposition unit is connected to the output flue and is used for producing cement under the high-temperature flue gas; and the flue gas recirculation unit is arranged between the output flue and the sludge treatment unit and provides the high-temperature flue gas as a heat source for the sludge treatment unit. The invention utilizes the cement kiln to cooperate with the domestic garbage treatment process, utilizes the flue gas waste heat to treat the sludge at low temperature, and further sends the treated sludge to the garbage incinerator for incineration, thereby not only saving the high construction and operation cost, but also realizing the reduction, harmless and recycling treatment of the sludge and the domestic garbage, and having obvious advantages of economic benefit, social benefit and environmental benefit.)

1. The system for cooperatively treating household garbage and sludge by using the cement kiln is characterized by comprising:

the waste incineration unit provides high-temperature flue gas through an output flue thereof;

a sludge treatment unit;

the cement decomposition unit is connected to the output flue and is used for producing cement under the high-temperature flue gas;

and the flue gas recirculation unit is arranged between the output flue and the sludge treatment unit and provides the high-temperature flue gas as a heat source for the sludge treatment unit.

2. The cement kiln co-disposed domestic waste and sludge system according to claim 1,

the system also comprises a primary air supply unit, wherein the primary air supply unit comprises a primary air fan, a first control switch and a second control switch, and the first control switch is connected to the output end of the primary air fan;

the output flue of the garbage incineration unit comprises a main flue and a furnace-pumping flue;

the flue gas recirculation unit comprises a dust remover, a flue gas air preheater and a flue gas recirculation fan which are sequentially arranged on the smoke channel of the furnace, the first output end of the flue gas recirculation fan is connected with the sludge treatment unit, and the second output end of the flue gas recirculation fan is connected with the garbage incineration unit;

the second control switch is arranged between the primary air fan and the flue gas air preheater, and controls the air quantity entering the flue gas air preheater through the second control switch so as to control the temperature of high-temperature flue gas output by the flue gas air preheater to be lower than 300 ℃.

3. The cement kiln co-disposed domestic waste and sludge system according to claim 2,

the flue gas recirculation unit still includes flue gas recirculation control unit, flue gas recirculation control unit includes:

the fourth control switch is arranged between the output end of the flue gas recirculation fan and the air supply channel of the waste incineration unit, and the fourth control switch is a bypass control switch of the sludge treatment unit;

and the fifth control unit is arranged between the output end of the flue gas recirculation fan and the sludge treatment unit, wherein the first control switch is a bypass control switch of the flue gas air preheater.

4. The cement kiln co-disposed domestic waste and sludge system according to claim 3,

the output flue of the garbage incineration unit comprises a main flue and a furnace-pumping flue;

and the third control switch is arranged between the output end of the flue gas recirculation fan and the furnace flue and controls the temperature of the high-temperature flue gas entering the dust remover to be lower than 500 ℃ through the third control switch.

5. The cement kiln co-disposed domestic waste and sludge system according to claim 4,

the sludge treatment unit includes sludge drying unit, sludge drying unit includes:

wet sludge stores storehouse, sludge drying machine and sludge conveyer, wet sludge stores the storehouse and connects the entry of sludge drying machine, sludge drying machine's export is passed through sludge conveyer sends into waste incinerator, carries out the cooperation with domestic waste and burns the mud after will drying.

6. The cement kiln co-disposed domestic waste and sludge system according to claim 5,

the sludge drier comprises an inlet and an outlet which respectively correspond to sludge and smoke, and the smoke outlet of the sludge drier is connected with smoke recycling nozzles which are arranged at the front arch and the rear arch of the waste incineration unit.

7. The cement kiln co-disposed domestic waste and sludge system according to claim 4,

the sludge treatment unit includes mud low temperature carbomorphism unit, mud low temperature carbomorphism unit includes that wet mud stores storehouse, force (forcing) pump, mud carbomorphism machine and sludge dewaterer, wet mud stores the storehouse and passes through the force (forcing) pump is connected the entry of mud carbomorphism machine, the exit linkage of mud carbomorphism machine sludge dewaterer sends into through the mud after the dehydration the msw incineration unit, waste water treatment unit is still connected to the sludge dewaterer.

8. The cement kiln co-disposed domestic waste and sludge system according to claim 7,

the sludge carbonizing machine comprises a carbonizing machine sludge inlet, a carbonizing machine sludge outlet, a carbonizing machine flue gas inlet and a carbonizing machine flue gas outlet, wherein the sludge carbonizing machine flue gas inlet is connected with the flue gas recirculation fan, and the sludge carbonizing machine flue gas outlet is connected with a flue gas recirculation nozzle which is arranged at the front arch and the rear arch of the garbage incinerator.

9. The cement kiln co-disposed domestic waste and sludge system according to any one of claims 5 to 8, wherein said system further comprises:

and the wastewater treatment unit is connected with a wastewater outlet of the sludge dewatering machine.

10. The cement kiln co-disposed domestic waste and sludge system according to claim 9, wherein said system further comprises:

the main flue control switch is arranged between the main flue and the cement decomposition unit;

and the furnace-pumping flue control switch is arranged between the furnace-pumping flue and the dust remover.

Technical Field

The invention relates to the technical field of municipal solid waste incineration and sludge disposal, in particular to a system for cooperatively disposing domestic waste and sludge by using a cement kiln.

Background

The disposal of municipal waste has become a worldwide concern and a major research topic for environmental protection in the world today. At present, the garbage disposal mode is mainly landfill and incineration power generation, and the two disposal technologies have great disadvantages. The landfill method occupies a large amount of valuable land resources and is harmful to the remaining time; in addition, the garbage disposal crisis is likely to spread in more cities due to the fact that the site selection of a new garbage landfill site is more and more difficult when a plurality of domestic garbage disposal plants run in an overload mode and the post-treatment measures of garbage are not in place. The burning power generation can generate poisonous and harmful gases such as fly ash, dioxin and the like, and secondary pollution is caused. Especially, dioxin emission caused by waste incineration is a main public environmental challenge.

The unique production process (alkaline atmosphere and high temperature of over 1000 ℃) of cement production provides excellent conditions for treating municipal domestic waste. The garbage incinerator is a system which is matched with a cement production line and utilizes the cement production line to treat urban garbage. The main process flow of the municipal refuse treatment system of the refuse incinerator is as follows: the municipal refuse is transported into the factory by the refuse transport vehicle of the municipal sanitation department in a sealing way, and then is delivered to the refuse discharging platform after being metered, and is discharged into the refuse storage pit through the sealing door. Homogenizing by a grab crane, feeding into a crusher for treatment, and returning the crushed garbage into a storage pit; then the mixture is sent into a garbage incinerator through a plate feeding machine, a belt conveyor and the like; introducing tertiary air into the water diversion mud kiln system for high-temperature combustion; returning the flue gas generated by combustion to the cement kiln decomposing furnace; cooling the ash slag generated by burning the garbage, and then sending the cooled ash slag into a cement raw material mill to be used as a cement raw material ingredient.

The household garbage is treated by utilizing the mechanical grate furnace, high-temperature smoke generated by incineration depends on a special environment in the cement kiln and a smoke treatment facility matched with a kiln body, the coal burning amount of a cement plant can be reduced, the amount of raw materials entering the kiln is reduced on the basis of not increasing pollution treatment equipment of the cement kiln, the reduction and resource treatment of the household garbage are realized, and the method becomes a very important household garbage treatment mode gradually.

The sludge is used as a secondary pollutant generated in the sewage treatment process, is rich in a large amount of microorganisms, refractory organic matters, salts, heavy metals and other harmful substances, and can influence the living ecological environment of people if the sludge is not subjected to harmless treatment. Because the water content of the sludge is higher and the volume is huge, the traditional sludge disposal modes such as landfill, composting and the like can not adapt to the domestic land requirement, and how to dispose the sludge efficiently and economically is a problem which is urgently solved in China.

Disclosure of Invention

It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure.

The invention provides a system for treating domestic garbage and sludge by using a cement kiln, which is used for treating sludge at a low temperature by using the system for treating domestic garbage by using the cement kiln, and has the advantages of safety, economy, energy conservation and environmental protection in domestic garbage and sludge treatment.

In order to achieve the above object, the present invention provides a system for co-processing domestic garbage and sludge in a cement kiln, the system comprising:

the waste incineration unit provides high-temperature flue gas through an output flue thereof;

a sludge treatment unit;

the cement decomposition unit is connected to the output flue and is used for producing cement under the high-temperature flue gas;

and the flue gas recirculation unit is arranged between the output flue and the sludge treatment unit and provides the high-temperature flue gas as a heat source for the sludge treatment unit.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the system also comprises a primary air supply unit, wherein the primary air supply unit comprises a primary air fan, a first control switch and a second control switch, and the first control switch is connected to the output end of the primary air fan;

the output flue of the garbage incineration unit comprises a main flue and a furnace-pumping flue;

the flue gas recirculation unit comprises a dust remover, a flue gas air preheater and a flue gas recirculation fan which are sequentially arranged on the smoke channel of the furnace, the first output end of the flue gas recirculation fan is connected with the sludge treatment unit, and the second output end of the flue gas recirculation fan is connected with the garbage incineration unit;

the second control switch is arranged between the primary air fan and the flue gas air preheater, and controls the air quantity entering the flue gas air preheater through the second control switch so as to control the temperature of high-temperature flue gas output by the flue gas air preheater to be lower than 300 ℃.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the flue gas recirculation unit still includes flue gas recirculation control unit, flue gas recirculation control unit includes:

the fourth control switch is arranged between the output end of the flue gas recirculation fan and the air supply channel of the waste incineration unit, and the fourth control switch is a bypass control switch of the sludge treatment unit;

and the fifth control unit is arranged between the output end of the flue gas recirculation fan and the sludge treatment unit, wherein the first control switch is a bypass control switch of the flue gas air preheater.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the output flue of the garbage incineration unit comprises a main flue and a furnace-pumping flue;

and the third control switch is arranged between the output end of the flue gas recirculation fan and the furnace flue and controls the temperature of the high-temperature flue gas entering the dust remover to be lower than 500 ℃ through the third control switch.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the sludge treatment unit includes sludge drying unit, sludge drying unit includes:

wet sludge stores storehouse, sludge drying machine and sludge conveyer, wet sludge stores the storehouse and connects the entry of sludge drying machine, sludge drying machine's export is passed through sludge conveyer sends into waste incinerator, carries out the cooperation with domestic waste and burns the mud after will drying.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the sludge drier comprises an inlet and an outlet which respectively correspond to sludge and smoke, and the smoke outlet of the sludge drier is connected with smoke recycling nozzles which are arranged at the front arch and the rear arch of the waste incineration unit.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the sludge treatment unit includes mud low temperature carbomorphism unit, mud low temperature carbomorphism unit includes that wet mud stores storehouse, force (forcing) pump, mud carbomorphism machine and sludge dewaterer, wet mud stores the storehouse and passes through the force (forcing) pump is connected the entry of mud carbomorphism machine, the exit linkage of mud carbomorphism machine sludge dewaterer sends into through the mud after the dehydration the msw incineration unit, waste water treatment unit is still connected to the sludge dewaterer.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the sludge carbonizing machine comprises a carbonizing machine sludge inlet, a carbonizing machine sludge outlet, a carbonizing machine flue gas inlet and a carbonizing machine flue gas outlet, wherein the sludge carbonizing machine flue gas inlet is connected with the flue gas recirculation fan, and the sludge carbonizing machine flue gas outlet is connected with a flue gas recirculation nozzle which is arranged at the front arch and the rear arch of the garbage incinerator.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the system further comprises:

and the wastewater treatment unit is connected with a wastewater outlet of the sludge dewatering machine.

Preferably, the invention further provides a system for cooperatively treating domestic garbage and sludge by using the cement kiln,

the system further comprises:

the main flue control switch is arranged between the main flue and the cement decomposition unit;

and the furnace-pumping flue control switch is arranged between the furnace-pumping flue and the dust remover.

The invention utilizes the cement kiln to cooperate with the domestic garbage treatment process, utilizes the flue gas waste heat to treat the sludge at low temperature, and further sends the treated sludge to the garbage incinerator for incineration, thereby not only saving the high construction and operation cost, but also realizing the reduction, harmless and recycling treatment of the sludge and the domestic garbage, and having obvious advantages of economic benefit, social benefit and environmental benefit.

Drawings

Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Further, although the terms used in the present disclosure are selected from publicly known and used terms, some of the terms mentioned in the specification of the present disclosure may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present disclosure is understood, not simply by the actual terms used but by the meaning of each term lying within.

The above and other objects, features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description of the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a system according to a first preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of a system according to a second preferred embodiment of the present invention.

Reference numerals

1-refuse incinerator

2-main flue control switch

3-cement decomposing furnace

4-smoke exhaust flue control switch

5-dust remover

6-Primary air blower

7-second control switch

8-first control switch

9-flue gas air preheater

10-flue gas recirculation fan

11-third control switch

12-fourth control switch

13-fifth control switch

14-sludge drying machine

15-wet sludge storage bin

16-sludge conveyer

17-flue gas recirculation nozzle

24-sludge carbonizing machine

26-pressure pump

27-sludge dewatering machine

28-wastewater treatment Unit

200-sludge treatment unit

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.

The process of cooperatively disposing 300t/d of domestic garbage by using a cement kiln is taken as an example, the designed calorific value of the domestic garbage is 1900kcal/kg, and the specific implementation mode of the invention is further illustrated by two examples.

Example 1

FIG. 1 is a schematic diagram of a preferred system for co-processing domestic waste and dried sludge in a cement kiln. The system comprises the following components.

A waste incineration unit.

The waste incinerator mainly comprises a waste incinerator 1, wherein a hearth outlet of the waste incinerator 1 comprises a main flue and a furnace pumping flue, and the incinerated slag is used as a cement raw material.

This waste incinerator 1 is used for burning mummification mud and domestic waste in coordination, and the high temperature flue gas after this burning gets into the flue main and takes out the stove flue respectively through the furnace export to realize getting into the smoke volume control of high temperature flue through flue main control switch 2 and the flue control switch 4 of taking out the stove on these two flues respectively. And (5) decomposing the unit.

The decomposing unit is composed of a cement decomposing furnace 3, and the garbage incinerator 1 passes through a main flue and is connected with the decomposing furnace 3 through a main flue control switch 2. Thus, the cement decomposing furnace 3 can use the high temperature flue gas (temperature about 950 ℃) generated by the garbage incinerator 1.

Specifically, in the cement decomposing furnace 3, raw material powder of cement is dispersed and suspended in a gas flow, and the carbonate is decomposed by combustion under high temperature conditions, and the lime material undergoes a decomposition reaction at about 900 ℃.

A primary air supply unit.

Because combustion requires a large amount of oxygen, oxygen is typically supplied by air supply.

The primary air supply is directed to the waste incinerator 1, that is, the primary air supply is supplied into the incinerator 1 from the lower side of the waste incinerator 1. In the traditional incinerator, secondary air supply is adopted, and in view of the fact that the system adopts a flue gas recirculation unit, the link of secondary air supply is cancelled.

The primary air supply unit comprises a primary air fan 6, a first control switch 8 and a second control switch 7 in the embodiment shown in fig. 1, and specifically, the primary air temperature required by the primary air fan 6 to enter the garbage incinerator 1 is obtained by adjusting the opening degrees of the first control switch 8 and the second control switch 7.

Furthermore, the first control switch 8 is an air bypass electric valve, and bypasses are arranged at two ends of the flue gas air preheater 9, and the valve plays two roles:

firstly, adjusting the primary air temperature entering the hearth of the garbage incinerator 1, wherein the garbage heat value is fluctuant, and the required air temperature also needs to be adjusted;

secondly, since the operation of the incinerator 1 is continuous, when the flue gas air preheater 9 needs to be serviced, the first control switch 8 is turned on, and the second control switch 7 is turned off, so that the normal operation of the incinerator 1 is maintained.

One of the most innovative aspects of the invention lies in the recirculation of the fumes, the composition of which and the working principle of which will be described in detail below.

In the preferred embodiment, the flue gas recirculation unit comprises a dust collector 5, a flue gas air preheater 9 and a flue gas recirculation fan 10, which are sequentially arranged on the flue at the rear end of the furnace-drawing flue control switch 4 of the garbage incinerator 1, and the first output end of the flue gas recirculation fan 10 is connected with the sludge treatment unit, and the second output end thereof is connected with the garbage incinerator 1.

In addition, the flue gas recirculation unit also comprises a flue gas recirculation control unit, which comprises a number of control switches, in particular as follows:

the second control switch 7 is arranged between the primary fan 6 and the inlet of the flue gas air preheater 9, controls the primary air supply quantity entering the flue gas air preheater 9 and further controls the temperature of the flue gas after heat exchange;

when the device works, the third control switch 11 is arranged between the output end of the flue gas recirculation fan 10 and the flue of the furnace, and the temperature of high-temperature flue gas entering the dust remover 5 is controlled to be lower than 500 ℃ through the third control switch 11, so that the temperature of the flue gas entering the sludge drier 14 is ensured to be lower than 300 ℃, the purpose of low-temperature sludge drying is realized, odor escape caused by drying at a high temperature is avoided, and pollution to air is reduced.

The fourth control switch 12 is arranged between the output end of the flue gas recirculation fan 10 and the air supply channel of the garbage incinerator 1;

and the fifth control unit 13 is arranged between the output end of the flue gas recirculation fan 10 and the flue gas inlet of the sludge drying machine 14.

The opening degree of the fourth control switch 12 and the opening degree of the fifth control switch 13 are adjusted by adopting a recirculation flue gas bypass mode, so that the ratio of the recirculation bypass flue gas to the drying process flue gas is adjusted, the requirement that the flue gas parameters of the sludge drying machine are in the range of process requirements is met, and the requirement that the temperature of a hearth of the garbage incinerator is adjusted through flue gas recirculation can also be met.

The fourth control switch 12 is used as a sludge drying bypass, and is mainly used for turning on the fourth control switch 12 when the sludge drying machine 14 is overhauled and stopped to ensure the stable operation of the garbage incinerator 1, and turning off the fourth control switch 12 when the garbage incinerator is normally dried.

Therefore, in the technical scheme of this embodiment 1, in order to ensure low-temperature drying, the high-temperature flue gas of the incinerator 1 is cooled once on the flue in front of the dust remover 5, and the high-temperature flue gas is cooled secondarily by the external fan in the flue gas air preheater 9.

Preferably, the fourth control switch 7 is an electric valve of the main air path.

In the above embodiment, the flue gas air preheater 9 performs indirect mixing heat exchange between air and high-temperature flue gas.

A sludge treatment unit.

In this embodiment 1, the sludge treatment unit 200 is specifically a sludge drying treatment unit, and the unit includes a wet sludge storage 15, a sludge drying machine 14, and a sludge conveyor 16. Wherein, wet sludge storage 15 uses as storing mud, and the exit linkage sludge drying machine 14 of this storage 15 storehouse, mud send into sludge drying machine 14 in carry out the mummification, then send into incinerator 1 through sludge conveyor 16, burn in coordination with domestic waste in incinerator 1 and utilize, the slag after burning uses as cement raw materials. Wherein, sludge drying machine 14 is equipped with the entry and the export to mud and flue gas respectively, concretely relates to: a drier sludge inlet, a drier sludge outlet, a drier flue gas inlet and a drier flue gas outlet; a flue gas inlet of the sludge drier 14 is connected with a flue gas recirculation fan 10, and the amount of high-temperature flue gas required by entering the sludge drier 14 is controlled by a fifth control switch 13; the smoke outlet of the sludge drier 14 is connected with a smoke recirculation nozzle 17 which is arranged at the front arch and the rear arch of the garbage incinerator 1.

When the system works, wet sludge is dried by the sludge drier 14 from the storage bin 15 and then is sent to the sludge conveyor 16, wet sludge with the water content of 80 percent temporarily stored in the wet sludge storage bin 15 is sent to the sludge drier 14 for drying, and then is sent to the garbage incinerator 1.

The flue gas which finishes the sludge drying process and the recirculation bypass flue gas are converged before the front arch and the rear arch of the garbage incinerator 1 and are sprayed into a hearth of the garbage incinerator 1 through a flue gas recirculation nozzle 17, so that a complete flue gas recirculation process is finished. The moisture content of the dried sludge is reduced from 80% to below 40%, the dried sludge and the household garbage are jointly sent to a garbage incinerator 1 through a sludge conveyor 16 to be incinerated and utilized, and the incinerated slag is used as a cement raw material.

Example 2

The embodiment 2 of the present invention shown in fig. 2 also includes a garbage incineration unit, a decomposition unit, a flue gas recirculation unit, and the like, and is different from the embodiment 1 in that a sludge low-temperature carbonization unit is adopted in the sludge treatment unit 200.

Specifically, the sludge low-temperature carbonization unit comprises a wet sludge storage bin 15, a pressure pump 26, a sludge carbonization machine 24 and a sludge dewatering machine 27, wherein the wet sludge storage bin 15 is connected with the inlet of the sludge carbonization machine 24 through the pressure pump 26, the outlet of the sludge carbonization machine 24 is connected with the sludge dewatering machine 27, and the dewatered sludge is sent into the garbage incinerator 1.

In order to match the wastewater produced after sludge dewatering, a wastewater treatment unit 28 is also employed in this embodiment.

More specifically, the sludge carbonizing machine 24 is provided with a carbonizing machine sludge inlet, a carbonizing machine sludge outlet, a carbonizing machine flue gas inlet and a carbonizing machine flue gas outlet.

In the preferred embodiment, the flue gas inlet of the sludge carbonizing machine 24 is connected with the flue gas recirculation fan 10; the flue gas inlet flue and the recirculated flue gas bypass of the sludge carbonization machine 24 are respectively connected with the fourth control unit 12 and the fifth control unit 13, and the flue gas outlet of the sludge carbonization machine 24 is connected with a flue gas recirculation nozzle 19 which is arranged at the front arch and the rear arch of the garbage incinerator 1.

In the preferred embodiment, the wet sludge is carbonized by the sludge carbonizing machine 24 and then sent to the sludge dewatering machine 27 in the form of pyrolysis liquid, so that the risk of dust explosion is avoided, and the transportation is convenient. The sludge dewatering machine 27 is provided with a dewatered sludge outlet and a wastewater outlet, and is used for mechanically dewatering the sludge to reduce the water content of the sludge from 80% to below 20%; the outlet of the dewatered sludge is connected to the garbage incinerator 1, and the outlet of the waste water is connected to the factory waste water treatment system 18. In summary, the high temperature flue gas generated by the garbage incinerator 1 with a temperature of about 950 ℃ enters the decomposing furnace 3 through the main flue control switch 2, and the other part of the high temperature flue gas is taken out from the furnace-pumping flue and is used as a heating heat source for primary air supply. In order to meet the requirement of primary air supply heating, a bypass flue of a flue gas air preheater 9 is arranged to adjust the parameters of mixed flue gas, the adjusted mixed flue gas with the temperature of about 500 ℃ enters a flue gas air preheater 9 after being dedusted by a deduster 5, exchanges heat with cooling air with the temperature of about 20 ℃ from a primary fan 6, a primary air bypass air channel is parallel to the flue gas air preheater 9, a first control switch 8 and a second control switch 7 are respectively arranged on a main air channel and a bypass air channel, the opening degrees of the two control switches are adjusted, and the primary air temperature required by the incinerator and with the temperature of about 150 ℃ is obtained.

The invention has the following beneficial technical effects:

according to the system for cooperatively treating the domestic garbage and the sludge by the cement kiln, the system for cooperatively treating the domestic garbage by the cement kiln is deeply coupled with the sludge low-temperature treatment process system, the flue gas subjected to heat exchange by the flue gas air preheater is sent to the sludge treatment unit for low-temperature treatment, a heat source does not need to be reconfigured, the flue gas is further doped into the garbage incineration system to finally realize furnace incineration, the incinerated high-temperature flue gas is taken as a supplementary heat source and is sent to a decomposing furnace, and the incinerated slag is taken as a cement raw material for use.

The invention effectively utilizes the flue gas waste heat of the cement kiln co-processing household garbage system to realize the low-temperature processing of the sludge, improves the energy utilization efficiency and the safety of the system, and reduces the sludge processing cost, thereby improving the overall operation economy of the cement kiln co-processing household garbage system.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

Although the present application has been described with reference to the present specific embodiments, it will be recognized by those skilled in the art that the foregoing embodiments are merely illustrative of the present application and that various changes and substitutions of equivalents may be made without departing from the spirit of the application, and therefore, it is intended that all changes and modifications to the above-described embodiments that come within the spirit of the application fall within the scope of the claims of the application.