阅读说明：本技术 一种市政污泥高温自维持焚烧系统及工艺 (High-temperature self-maintaining incineration system and process for municipal sludge ) 是由 汪军 陈涛 刘程 徐汝民 恽壮志 陈斌 伍毅贤 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种市政污泥高温自维持焚烧系统,包括污泥稀释系统、污泥分层系统、有机污泥浓缩系统、污泥脱水系统、污泥干化系统以及焚烧系统。其运行流程包括污泥消毒杀菌、污泥有机/无机分离、有机污泥浓缩脱水、有机污泥初步、二次干化和高温焚烧。市政污泥经过预处理,降低后续有机污泥中的重金属含量和灰分,得到高热值二次干化污泥,其能够在焚烧炉中自维持高温燃烧,不需要人为添加高热值辅助性燃料,节约资源,是持续可靠的处置方案。(The invention discloses a municipal sludge high-temperature self-maintaining incineration system which comprises a sludge dilution system, a sludge layering system, an organic sludge concentration system, a sludge dewatering system, a sludge drying system and an incineration system. The operation flow comprises sludge disinfection and sterilization, sludge organic/inorganic separation, organic sludge concentration and dehydration, primary and secondary drying of organic sludge and high-temperature incineration. Municipal sludge is pretreated, so that the heavy metal content and ash content in subsequent organic sludge are reduced, secondary dried sludge with high heat value is obtained, high-temperature combustion can be maintained in an incinerator, artificial addition of auxiliary fuel with high heat value is not needed, resources are saved, and the method is a continuous and reliable disposal scheme.)

1. A high-temperature self-maintaining incineration process for municipal sludge is characterized by comprising the following steps:

s1: diluting sludge, namely diluting the sludge into sludge slurry in a sludge stirring barrel by adding water and alkali, and killing microorganisms in the sludge by adopting ultraviolet rays;

s2: performing sludge layering treatment, namely forming an upper layer and a lower layer of inorganic components and organic components in the sludge according to density by adopting a centrifugal precipitation method, wherein the upper layer is organic sludge, and the lower layer is inorganic sludge;

s3: concentrating organic sludge, separating lower-layer inorganic sludge, adding an organic flocculant into a sludge stirring barrel, standing, coagulating and precipitating, and separating and intercepting to obtain concentrated organic sludge;

s4: sludge dewatering and drying treatment, wherein concentrated organic sludge is subjected to filter-pressing dewatering, primary drying and secondary drying in sequence;

s5: carrying out incineration treatment, namely crushing the dried organic sludge, and then feeding the crushed organic sludge into an incinerator for incineration treatment;

s6: and (3) sewage treatment, separation, concentration and drying processes are carried out, and the sewage enters a sewage treatment plant for treatment.

2. A municipal sludge high-temperature self-sustaining incineration system, comprising:

the sludge dilution system is used for adding water and alkali into the sludge stirring barrel to dilute into sludge slurry;

the sludge layering system is used for dividing the sludge into upper-layer organic sludge and lower-layer inorganic sludge by adopting a centrifugal precipitation method;

an organic sludge concentration system;

a sludge dewatering system for dewatering the concentrated organic sludge through filter pressing;

the sludge drying system is used for carrying out drying treatment on the dewatered sludge for multiple times;

and the incineration system is used for incinerating the dried organic sludge.

3. The high-temperature self-sustaining incineration system for municipal sludge according to claim 2, characterized in that: the sludge slurry is weakly alkaline.

4. The high-temperature self-sustaining incineration system for municipal sludge according to claim 2, characterized in that: the sludge stirring barrel is of a double-wall hollow structure formed by an inner barrel and an outer barrel, the inner barrel is a transparent light-transmitting toughened barrel, the outer barrel is a light-tight toughened barrel, and an ultraviolet lamp tube is embedded between the inner barrel and the outer barrel.

5. The high-temperature self-sustaining incineration system for municipal sludge according to claim 2, characterized in that: the bottom of the sludge stirring barrel is provided with a cone structure, and the layered inorganic sludge is intercepted in the cone structure and is discharged from an outlet formed in the bottom of the cone structure.

6. The high-temperature self-sustaining incineration system for municipal sludge according to claim 2, characterized in that: a rotating shaft driven by a motor is vertically arranged in the sludge stirring barrel, and a plurality of rotating blades are arranged on the rotating shaft.

7. The high-temperature self-sustaining incineration system for municipal sludge according to claim 2, characterized in that: the top of the sludge stirring barrel is provided with a sludge feeding hole.

Technical Field

The invention relates to the technical field of municipal sludge treatment equipment, in particular to a municipal sludge high-temperature self-maintaining incineration system and process.

Background

The municipal sludge is a byproduct of operation of a municipal sewage treatment plant, has complex components and high water content, and mainly comprises organic matters (soluble sugars, proteins, fats and the like), inorganic matters (metal salts, N, P, K and the chemical combination state thereof, heavy metal elements, SiO2 and the like), and microorganisms (bacteria, fungi, actinomycetes and other bacteria). Because the municipal sludge has high water content and inorganic component ratio and low comprehensive heat value, the municipal sludge is directly used for incineration and has low efficiency, and heavy metals can be discharged into the atmosphere. Therefore, municipal sludge is pretreated by adding alkali, part of heavy metals form precipitates, and the heavy metal precipitates are separated from organic components along with inorganic components by centrifugation. The organic matter content in the organic components is obviously increased, the ash content is obviously reduced, and the high-calorific-value fuel is formed through dehydration treatment and can be directly used for incineration.

At present, domestic sludge incineration disposal systems and equipment are more, and generally, municipal sludge is incinerated by adopting a dehydration mode by people. The utility model with patent number CN205279100U proposes to adopt the mode of burning to realize the minimizing of mud, but it does not consider the calorific value of the mud of advancing stove, finally leads to the mud incineration efficiency lower, burns inadequately, incompletely. According to the invention, the heavy metal content in the subsequent organic sludge is reduced through sludge pretreatment, the treated secondary dried sludge meets the heat value standard of the fuel entering the incinerator, other high-heat-value auxiliary fuels are prevented from being artificially added, the secondary dried sludge can be self-maintained to be burnt at high temperature in the incinerator, the incineration ash content is less, and the energy is saved and the emission is reduced.

Therefore, a municipal sludge high-temperature self-maintenance incineration system and a municipal sludge high-temperature self-maintenance incineration process are provided for solving the problems.

Disclosure of Invention

The invention aims to provide a high-temperature self-maintenance incineration system for municipal sludge, which solves the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a high-temperature self-maintaining incineration process for municipal sludge comprises the following steps:

s1: diluting sludge, namely diluting the sludge into sludge slurry in a sludge stirring barrel by adding water and alkali, and killing microorganisms in the sludge by adopting ultraviolet rays;

s2: performing sludge layering treatment, namely forming an upper layer and a lower layer of inorganic components and organic components in the sludge according to density by adopting a centrifugal precipitation method, wherein the upper layer is organic sludge, and the lower layer is inorganic sludge;

s3: concentrating organic sludge, separating lower-layer inorganic sludge, adding an organic flocculant into a sludge stirring barrel, standing, coagulating and precipitating, and separating and intercepting to obtain concentrated organic sludge;

s4: sludge dewatering and drying treatment, wherein concentrated organic sludge is subjected to filter-pressing dewatering, primary drying and secondary drying in sequence;

s5: carrying out incineration treatment, namely crushing the dried organic sludge, and then feeding the crushed organic sludge into an incinerator for incineration treatment;

s6: and (3) sewage treatment, separation, concentration and drying processes are carried out, and the sewage enters a sewage treatment plant for treatment.

The invention provides a municipal sludge high-temperature self-maintaining incineration system, which comprises:

the sludge dilution system is used for adding water and alkali into the sludge stirring barrel to dilute into sludge slurry;

the sludge layering system is used for dividing the sludge into upper-layer organic sludge and lower-layer inorganic sludge by adopting a centrifugal precipitation method;

an organic sludge concentration system;

a sludge dewatering system for dewatering the concentrated organic sludge through filter pressing;

the sludge drying system is used for carrying out drying treatment on the dewatered sludge for multiple times;

and the incineration system is used for incinerating the dried organic sludge.

Preferably, the sludge slurry is weakly alkaline.

Preferably, the sludge stirring barrel is of a double-wall hollow structure formed by an inner barrel and an outer barrel, the inner barrel is a transparent light-transmitting toughened barrel, the outer barrel is a light-tight toughened barrel, and an ultraviolet lamp tube is embedded between the inner barrel and the outer barrel.

Preferably, the bottom of the sludge stirring barrel is provided with a cone structure, and the layered inorganic sludge is intercepted in the cone structure and is discharged from an outlet formed in the bottom of the cone structure.

Preferably, a rotating shaft driven by a motor is vertically arranged in the sludge stirring barrel, and a plurality of rotating blades are arranged on the rotating shaft.

Preferably, the top of the sludge stirring barrel is provided with a sludge feeding hole.

Compared with the prior art, the invention has the beneficial effects that: municipal sludge is pretreated, so that the heavy metal content and ash content in subsequent organic sludge are reduced, secondary dried sludge with high heat value is obtained, high-temperature combustion can be maintained in an incinerator, artificial addition of auxiliary fuel with high heat value is not needed, resources are saved, and the method is a continuous and reliable disposal scheme.

Drawings

FIG. 1 is a schematic flow diagram of an incineration system according to the present invention;

FIG. 2 is a schematic view of a sludge stirring barrel according to the present invention;

in the figure: 1. a sludge stirring barrel; 11. an inner barrel; 12. an outer tub; 101. a sludge feeding port; 102. an ultraviolet lamp tube; 103. a rotating shaft; 104. a rotating blade; 105. a cone structure; 106. and (7) an outlet.

Detailed Description

The technical solution of the present invention will be described below with reference to the accompanying drawings and examples.

Referring to fig. 1-2, the present invention provides a technical solution:

the invention provides a municipal sludge high-temperature self-maintaining incineration system, which comprises: the system comprises a sludge diluting system, a sludge layering system, an organic sludge concentrating system, a sludge dewatering system, a sludge drying system and an incineration system.

The operation flow comprises sludge disinfection and sterilization, sludge organic/inorganic separation, organic sludge concentration and dehydration, primary and secondary drying of organic sludge and high-temperature incineration.

The factory sludge of the sewage treatment plant enters the sludge stirring barrel 1 from the sludge feeding hole 101, the ultraviolet lamp tube 102 in the sludge stirring barrel 1 is opened, the sludge is diluted into sludge slurry by adding water, a little NaOH is added to make the sludge slurry be alkalescent, the rotating blades 104 are used for rapidly stirring, and the sludge is kept still for precipitation.

After standing, the precipitated sludge is distinguished according to the volume, the lower half part is inorganic components, the upper half part is organic components, the inorganic sludge is concentrated by gravity in the cone structure 105, the outlet 106 of the sludge stirring barrel 1 is opened, and the bottom inorganic sludge is separated and removed. Adding a small amount of organic flocculant to carry out coagulating sedimentation on suspended organic compounds, standing, carrying out gravity concentration on the organic sludge in the cone structure 105, opening the outlet 106, separating and discharging the concentrated organic sludge, closing the ultraviolet lamp tube 102, and collecting the residual sewage.

The water content of the concentrated organic sludge is higher, the preliminary dehydration is carried out by a plate-and-frame filter press, the mobility of the organic sludge is reduced, and the sewage is collected.

And (3) sequentially carrying out primary drying and secondary drying on the primarily dehydrated sludge by using a superheated steam drying device, and reducing the water content to about 10%.

The secondary dried sludge is extruded and crushed by the conveyor belt and then enters the incinerator for incineration disposal, the secondary dried sludge can be used for power generation, and part of heat generated by incineration is supplied to the primary dehydrated sludge for primary drying and secondary drying in sequence.

In an embodiment of the invention, the sludge stirring barrel 1 is a double-wall hollow structure formed by an inner barrel 11 and an outer barrel 12, the inner barrel 11 is a transparent light-transmitting toughened barrel, the outer barrel 12 is a light-tight toughened barrel, and an ultraviolet lamp tube 102 is embedded between the inner barrel 11 and the outer barrel 12.

The bottom of the sludge stirring barrel 1 is provided with a cone structure 105, and the layered inorganic sludge is retained in the cone structure 105 and discharged from an outlet 106 formed in the bottom of the cone structure 105.

A rotating shaft 103 driven by a motor is vertically arranged in the sludge stirring barrel 1, and a plurality of rotating blades 104 are arranged on the rotating shaft 103.

Further, a sludge feeding hole 101 is formed in the top of the sludge stirring barrel 1.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.