阅读说明：本技术 一种城市生活污泥高效处理工艺 (Efficient treatment process for municipal domestic sludge ) 是由 姚孝君 于 2021-05-26 设计创作，主要内容包括：本发明公开了一种城市生活污泥高效处理工艺,属于污泥处理领域,包括以下步骤：S01：对污泥进行预脱水处理,得到预处理污泥；S02：将预处理污泥泵入搅拌容器内,对预处理污泥进行搅拌；S03：在搅拌过程中向搅拌容器内加入复合脱水剂,搅拌均匀后泵入密封容器内静置20-45min,得到反应后污泥与反应气体；S04：将反应后污泥泵入脱水机中进行脱水；本方案通过向预脱水的污泥内添加复合脱水剂,可对污泥内的水分进行有效的吸收,从而降低污泥的含水率,简化污泥处理的步骤,提高污泥脱水的效率,且通过分级加热焚烧的方式,在一定程度上降低污泥资源再利用的含水率条件,能够在短时间内实现对污泥的再次利用。(The invention discloses an efficient treatment process for municipal domestic sludge, belonging to the field of sludge treatment and comprising the following steps: s01: carrying out pre-dehydration treatment on the sludge to obtain pre-treated sludge; s02: pumping the pretreated sludge into a stirring container, and stirring the pretreated sludge; s03: adding the composite dehydrating agent into a stirring container in the stirring process, uniformly stirring, pumping into a sealed container, and standing for 20-45min to obtain sludge and reaction gas after reaction; s04: pumping the sludge after the reaction into a dehydrator for dehydration; this scheme is through adding compound dehydrating agent in to the mud of dehydration in advance, can carry out effectual absorption to the moisture in the mud to reduce the moisture content of mud, simplify sludge treatment's step, improve sludge dewatering's efficiency, and through the mode that heats in grades and burn, reduce the moisture content condition that mud resource recycles to a certain extent, can realize the reuse to mud in the short time.)

1. An efficient treatment process for municipal domestic sludge, which is characterized in that: the method comprises the following steps:

s01: carrying out pre-dehydration treatment on the sludge to obtain pre-treated sludge;

s02: pumping the pretreated sludge into a stirring container, and stirring the pretreated sludge;

s03: adding the composite dehydrating agent into a stirring container in the stirring process, uniformly stirring, pumping into a sealed container, and standing for 20-45min to obtain sludge and reaction gas after reaction;

s04: pumping the sludge after the reaction into a dehydrator for dehydration to obtain dry and solid sludge;

s05: crushing the dry solid sludge, and uniformly mixing the crushed dry solid sludge with a combustion improver to obtain fuel particles with uniform particle size;

s06: introducing the fuel particles into an incinerator to be mixed and combusted with other fuels, and introducing reaction gas above the fuel particles in the incinerator to be combusted;

s07: in the incineration process, graded air supply is adopted to supply oxygen below and above the fuel particles in the incinerator;

s08: the heat energy generated in incineration is used for pre-dehydration in S01 after the heat energy is used.

2. The efficient treatment process of municipal sludge according to claim 1, characterized by comprising the following steps: the composite dehydrating agent comprises the following components in percentage by weight: kaolin: 10-30% of fly ash: 5-10%, slag: 10-20%, coal slag: 10-20%, pulverized coal: 15-30% and lime: 30-50%, sulfamic acid: 3 to 5 percent.

3. The efficient municipal sludge treatment process according to claim 2, wherein the efficient municipal sludge treatment process comprises the following steps: the preparation method of the composite dehydrating agent comprises the following steps:

weighing kaolin, fly ash, slag, cinder, coal powder, lime and sulfamic acid according to the formula ratio, crushing and mixing uniformly, and bagging.

4. The efficient municipal sludge treatment process according to claim 2, wherein the efficient municipal sludge treatment process comprises the following steps: the ratio of lime to sulfamic acid is 10: 1.

5. The efficient municipal sludge treatment process according to any one of claims 1 to 4, wherein the efficient municipal sludge treatment process comprises the following steps: in the S03, the ratio of the composite dehydrating agent to the pretreated sludge is 1: (3-5).

6. The efficient treatment process of municipal sludge according to claim 1, characterized by comprising the following steps: in S01, the pre-dehydration process includes:

carrying out primary precipitation on the sludge, and removing supernatant to obtain primary precipitated sludge;

carrying out secondary sedimentation on the primary precipitated sludge, and removing supernatant to obtain secondary precipitated sludge;

concentrating the secondary precipitated sludge by using concentration equipment to obtain concentrated sludge, wherein the water content of the concentrated sludge is 93-98%;

and (3) drying and dehydrating the concentrated sludge by using a heat drying device to obtain pretreated sludge, wherein the water content of the pretreated sludge is 70-85%.

7. The efficient municipal sludge treatment process according to claim 6, wherein the efficient municipal sludge treatment process comprises the following steps: the heat source of the heat drying device adopts the residual heat in S08.

8. The efficient treatment process of municipal sludge according to claim 1, characterized by comprising the following steps: a horizontal round incineration area is arranged in the incinerator, and a material stirring mechanism is arranged at the top of the incineration area in the incinerator; the material stirring mechanism rotates by taking the circle center of the top surface of the incineration area as a rotation center, and is used for stirring fuel particles and other fuels distributed on the surface of the incineration area to the center of the incineration area.

9. The efficient municipal sludge treatment process according to claim 8, wherein the efficient municipal sludge treatment process comprises the following steps: the incineration temperature of the incineration zone is gradually reduced from the center of the circle to the outside, the incineration temperature at the center of the circle of the incineration zone is 800-plus-900 ℃, and the incineration temperature at the edge of the incineration zone is 180-plus-250 ℃.

10. The efficient treatment process of municipal sludge according to claim 1, characterized by comprising the following steps: and the water content of the dried and solid sludge in the S04 is 35-60%.

Technical Field

The invention relates to the field of sludge treatment, in particular to an efficient treatment process for urban domestic sludge.

Background

Sludge treatment is a process of carrying out reduction, stabilization and harmless treatment on sludge. The higher the degree of wastewater treatment, the more sludge residue will be produced to be treated. A general sewage treatment plant must be provided with a sludge treatment facility unless the sewage is treated using land treatment or a sewage pond. For modern sewage treatment plants, the treatment and disposal of sludge has become the most complex and costly part of the operation of sewage treatment systems.

At present, in China, each sewage treatment plant discharges a large amount of sludge with the water content of about 99.2% every day, and the large amount of sludge becomes a difficult problem which needs to be treated urgently. The urban domestic sludge contains a large amount of organic substances and has a high calorific value, and the sludge is also provided with a resource recycling value. The basic conditions for domestic sludge to exert its potential value are: the water content of the sludge needs to be reduced to below 30%. At present, a sewage treatment plant in cities in China generally adopts a sludge dewatering machine to dewater sludge, the water content of the formed sludge is 75-80%, which is far from the required 30%, and the basic condition of sludge reutilization cannot be achieved.

Therefore, an efficient treatment process for municipal sludge is needed to better recycle the sludge.

Disclosure of Invention

The invention aims to provide an efficient treatment process for municipal domestic sludge, which can realize the condition of reducing the water content of the sludge resource for reuse so as to fully utilize the value of the sludge.

In order to solve the problems, the invention adopts the following technical scheme:

an efficient treatment process for municipal domestic sludge, comprising the following steps:

s01: carrying out pre-dehydration treatment on the sludge to obtain pre-treated sludge;

s02: pumping the pretreated sludge into a stirring container, and stirring the pretreated sludge;

s03: adding the composite dehydrating agent into a stirring container in the stirring process, uniformly stirring, pumping into a sealed container, and standing for 20-45min to obtain sludge and reaction gas after reaction;

s04: pumping the sludge after the reaction into a dehydrator for dehydration to obtain dry and solid sludge;

s05: crushing the dry solid sludge, and uniformly mixing the crushed dry solid sludge with a combustion improver to obtain fuel particles with uniform particle size;

s06: introducing the fuel particles into an incinerator to be mixed and combusted with other fuels, and introducing reaction gas above the fuel particles in the incinerator to be combusted;

s07: in the incineration process, graded air supply is adopted to supply oxygen below and above the fuel particles in the incinerator;

s08: the heat energy generated in incineration is used for pre-dehydration in S01 after the heat energy is used.

As a preferable scheme of the invention, the composite dehydrating agent comprises the following components in percentage by weight: kaolin: 10-30% of fly ash: 5-10%, slag: 10-20%, coal slag: 10-20%, pulverized coal: 15-30% and lime: 30-50%, sulfamic acid: 3 to 5 percent.

As a preferable scheme of the invention, the preparation method of the composite dehydrating agent comprises the following steps:

weighing kaolin, fly ash, slag, cinder, coal powder, lime and sulfamic acid according to the formula ratio, crushing and mixing uniformly, and bagging.

As a preferred embodiment of the present invention, the ratio of lime to sulfamic acid is 10: 1.

In a preferable embodiment of the present invention, in S03, the ratio of the composite dewatering agent to the pretreated sludge is 1: (3-5).

In a preferred embodiment of the present invention, in S01, the pre-dehydration includes:

carrying out primary precipitation on the sludge, and removing supernatant to obtain primary precipitated sludge;

carrying out secondary sedimentation on the primary precipitated sludge, and removing supernatant to obtain secondary precipitated sludge;

concentrating the secondary precipitated sludge by using concentration equipment to obtain concentrated sludge, wherein the water content of the concentrated sludge is 93-98%;

and (3) drying and dehydrating the concentrated sludge by using a heat drying device to obtain pretreated sludge, wherein the water content of the pretreated sludge is 70-85%.

In a preferred embodiment of the present invention, the heat source of the thermal drying device uses the residual heat in S08.

As a preferable scheme of the invention, a horizontal round incineration area is arranged in the incinerator, and a material stirring mechanism is arranged at the top of the incineration area in the incinerator; the material stirring mechanism rotates by taking the circle center of the top surface of the incineration area as a rotation center, and is used for stirring fuel particles and other fuels distributed on the surface of the incineration area to the center of the incineration area.

As a preferred scheme of the invention, the incineration temperature of the incineration zone is gradually reduced from the center of the circle to the outside, the incineration temperature at the center of the incineration zone is 800-900 ℃, and the incineration temperature at the edge of the incineration zone is 180-250 ℃.

In a preferred embodiment of the present invention, the water content of the dried solid sludge in S04 is 35 to 60%.

Compared with the prior art, the invention has the advantages that:

(1) this scheme is through adding compound dehydrating agent in to the mud of dehydration in advance, can carry out effectual absorption to the moisture in the mud to reduce the moisture content of mud, simplify sludge treatment's step, improve sludge dewatering's efficiency, and through the mode that heats in grades, reduce the moisture content condition that mud resource recycles to a certain extent, can realize in the short time recycling to mud, reduced the treatment cost of mud.

(2) According to the scheme, lime and sulfamic acid components are added into the composite dehydrating agent, so that the PH of the sludge is in a strong alkaline state in the process of treating the sludge, microorganisms in the sludge are effectively killed, odor in the sludge is removed, harmless treatment of the sludge is realized, most metal ions in the sludge can be precipitated due to high PH, and the solubility and activity degree of the metal ions are reduced; so as to improve the solid content of the sludge.

(3) This scheme is through the interpolation of compound dehydrating agent, the carbon content in the mud has been improved greatly, compare in the mud of traditional the same moisture content, the heat of its release after the burning is higher, and in the incineration process, the fuel granule of preparing by the solid mud of doing through many temperature intervals is drying the back and is burning, can effectual improvement combustion efficiency, and under this kind of operating means, the fuel granule of burning zone center can be dried the heating to the fuel granule at burning zone edge to the heat of radiating all around when burning, thereby thermal loss has been reduced, and the use amount of gas has been practiced thrift to a certain extent, energy-conserving purpose has been reached.

Drawings

FIG. 1 is a schematic view of the distribution of plectrum sheets in the present invention;

fig. 2 is a bottom view of the kick-off lever of the present invention.

The reference numbers in the figures illustrate:

1. a material poking rod; 2. and (6) stirring the material sheet.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

an efficient treatment process for municipal domestic sludge, comprising the following steps:

s01: carrying out pre-dehydration treatment on the sludge to obtain pre-treated sludge;

s02: pumping the pretreated sludge into a stirring container, and stirring the pretreated sludge;

s03: adding the composite dehydrating agent into a stirring container in the stirring process, uniformly stirring, pumping into a sealed container, and standing for 20-45min to obtain sludge and reaction gas after reaction;

s04: pumping the sludge after the reaction into a dehydrator for dehydration to obtain dry and solid sludge;

s05: crushing the dry solid sludge, and uniformly mixing the crushed dry solid sludge with a combustion improver to obtain fuel particles with uniform particle size;

s06: introducing the fuel particles into an incinerator to be mixed and combusted with other fuels, and introducing reaction gas above the fuel particles in the incinerator to be combusted;

s07: in the incineration process, graded air supply is adopted to supply oxygen below and above the fuel particles in the incinerator;

s08: the heat energy generated in incineration is used for pre-dehydration in S01 after the heat energy is used.

In the embodiment, after the water content of the sludge is reduced by adopting the pre-dehydration treatment to pre-treat the sludge, adding the composite dehydrating agent in the stirring process of the sludge so as to absorb the water of the sludge, sterilizing the sludge to make the sludge harmless, then dehydrating the sludge by using a dehydrator to prepare fuel particles, wherein, the combustion improver for preparing the fuel particles can adopt fire coal, waste paper residues, crop straws and the like, and then the fuel particles are mixed with corresponding fuel according to the incineration application and then are led into an incinerator for incineration, the fuel particles can be mixed with coal or household garbage according to a certain proportion and then used for coal-fired power generation and household garbage incineration power generation of a power plant, and can also be mixed with the coal according to a certain proportion and then used for synergistic incineration of various industrial kilns so as to fully utilize the value of sludge.

Further, in S04, the dewatering machine for dewatering sludge may be a plate-and-frame filter press, a belt-type sludge dewatering machine, a centrifugal sludge dewatering machine, a stacked sludge dewatering machine, or the like;

the plate-and-frame filter press is the first machine used for chemical dehydration. Although the plate-and-frame filter press is generally operated intermittently, has larger investment on capital equipment and lower filtering capacity, the plate-and-frame filter press is still widely applied to some small sewage plants because of the advantages of large filtering driving force, high solid content of filter cakes, clear filtrate, high solid recovery rate, low consumption of conditioning drugs and the like;

the working principle of the belt type sludge dewatering machine is as follows: after the concentrated sludge and a flocculating agent with a certain concentration are fully mixed in a static mixer and a dynamic mixer, tiny solid particles in the sludge are aggregated into flocculent lumps with larger volume, meanwhile, free water is separated out, the flocculated sludge is conveyed to a filter belt for concentration and gravity dehydration, the free water is separated under the action of gravity to form sludge in a non-flowing state, then the sludge is clamped between an upper mesh belt and a lower mesh belt, and the sludge is gradually extruded under the action of small-to-large extrusion force and shearing force in a wedge-shaped prepressing area, a low-pressure area and a high-pressure area to achieve the maximum mud-water separation, and finally, a filter cake is formed and discharged;

centrifugal sludge dewatering machine: the sludge is sent into the rotary drum by the hollow rotating shaft and is immediately thrown into the cavity of the rotary drum under the centrifugal force generated by high-speed rotation. Due to the different specific gravity, solid-liquid separation is formed. The sludge is conveyed to the conical end of the rotary drum under the pushing of the screw conveyor and is continuously discharged from the outlet; the liquid in the liquid ring layer is discharged outside the rotary drum by gravity through the weir port in a continuous 'overflow' manner;

stacking type sludge dewatering machine: the filter is formed by mutually stacking a fixed ring and a movable ring, and a spiral shaft penetrates through a filter main body formed by the spiral shaft. Full dehydration is realized through gravity concentration and internal pressure effect that mud received the back pressure board to form in advancing process, and the filtrating is discharged from the filter joint that solid fixed ring and activity ring formed, and the mud cake is discharged from the end of dehydration portion.

Specifically, the composite dehydrating agent comprises the following components in percentage by weight: kaolin: 10-30% of fly ash: 5-10%, slag: 10-20%, coal slag: 10-20%, pulverized coal: 15-30% and lime: 30-50%, sulfamic acid: 3 to 5 percent.

In the embodiment, the kaolin is a non-metallic mineral product, is white, fine and soft, has good physical and chemical properties such as plasticity, fire resistance and the like, and can improve the plasticity of dry and solid sludge when being used for a composite dehydrating agent so as to facilitate the molding during the preparation of fuel particles;

the fly ash is formed by burning and cooling coal powder at high temperature (1300-1500 ℃), most of the fly ash is spherical, the surface of the fly ash is smooth, and micropores are small. Part of the particles are adhered when melted, the surfaces are rough, the edges and corners are more cellular combined particles, the particles can be used as an adsorbent or a filter aid for treating sewage, and the fly ash is used as a composite dehydrating agent, so that the fly ash can absorb moisture in pretreated sludge and adsorb harmful substances in water after being mixed into the pretreated sludge;

the slag is a byproduct in the blast furnace ironmaking process, in the ironmaking process, iron oxide is reduced into metallic iron at high temperature, impurities such as silicon dioxide, aluminum oxide and the like in iron ore react with lime and the like to generate a melt which takes silicate and aluminosilicate as main components, and the melt is quenched into loose and porous granular substances, namely blast furnace slag, called slag for short, and the slag is used for a composite dehydrating agent, so that the water in sludge can be absorbed by utilizing the loose and porous characteristics of the slag;

coal slag, one of industrial solid wastes, waste slag discharged by coal burning of thermal power plants, industrial and civil boilers and other equipment, also called slag, carbon contained in the coal slag, and the crushed coal slag is mixed into sludge, so that not only can the water content of the sludge be absorbed, but also fuel particles made of the sludge can be better combusted;

the coal powder is coal with the granularity of less than 0.5 mm, and can be used in the composite dehydrating agent to improve the carbon content of the sludge after being mixed with the sludge;

after the lime-containing composite dehydrating agent such as sludge is mixed, lime absorbs moisture in the sludge to form a lime water solution, the pH value of the saturated lime water solution can reach 12, microorganisms in the sludge can be effectively killed, odor in the sludge is removed, meanwhile, high pH value enables most metal ions in the sludge to be precipitated, and the solubility and activity degree of the metal ions are reduced; so as to improve the solid content of the sludge;

furthermore, sulfamic acid is used in the composite dehydrating agent, ammonia gas can be generated in the reaction process, so that the sterilizing effect is further enhanced, and simultaneously, the use amount of lime and the reaction time can be reduced by adding a small amount of sulfamic acid.

Specifically, the preparation method of the composite dehydrating agent comprises the following steps:

weighing kaolin, fly ash, slag, cinder, coal powder, lime and sulfamic acid according to the formula ratio, crushing and mixing uniformly, and bagging.

In this embodiment, it should be noted that the main objects to be crushed are kaolin, slag, cinder and lime, and the particle diameter of the crushed objects is less than 200 mesh.

Specifically, the ratio of lime to sulfamic acid is 10: 1.

Specifically, in S03, the ratio of the composite dehydrating agent to the pretreated sludge is 1: (3-5).

In this embodiment, preferably, the ratio of the composite dehydrating agent to the pretreated sludge is 1: 4, ensuring that the ratio of lime to the pretreated sludge is not less than 1:15, so that after the composite dehydrating agent is mixed with the pretreated sludge, the lime aqueous solution can reach a saturated state, thereby ensuring the sterilization effect on the pretreated sludge.

Specifically, in S01, the pre-dehydration process includes:

carrying out primary precipitation on the sludge, and removing supernatant to obtain primary precipitated sludge;

carrying out secondary sedimentation on the primary precipitated sludge, and removing supernatant to obtain secondary precipitated sludge;

concentrating the secondary precipitated sludge by using concentration equipment to obtain concentrated sludge, wherein the water content of the concentrated sludge is 93-98%;

and (3) drying and dehydrating the concentrated sludge by using a heat drying device to obtain pretreated sludge, wherein the water content of the pretreated sludge is 70-85%.

In this embodiment, the concentration device may adopt a gravity concentration tank, an air flotation concentration tank and a mechanical concentration tank, wherein the gravity concentration tank concentrates the sludge by using a sedimentation principle, and may be divided into a continuous type and an intermittent type according to different operation modes, and the gravity concentration tank has the advantages of no need of dosing, low energy consumption, stable operation, simple management and the like;

the air flotation concentration tank is used for releasing gas dissolved in water in a micro-bubble mode, and can be quickly and uniformly attached to solid particles of sludge, so that the density of the solid particles is smaller than that of water to generate floating, and the aim of separating the solid particles from the water is fulfilled, the water content of the sludge can be reduced to 94-96% from 99.5% by the air flotation concentration tank, the water content of the sludge is lower than that of the sludge obtained after gravity concentration, but the air flotation concentration tank is higher in operation cost, complex in system and high in operation management difficulty;

the mechanical concentration tank is newly developed sludge concentration equipment, the water content of the sludge is reduced in a mechanical mode after the sludge is subjected to chemical flocculation, so that the mechanical concentration tank is suitable for various types of sludge, the water content of the sludge can be reduced from 99.5% to below 94%, the volume of the sludge can be greatly reduced, the capacity of sludge dewatering equipment is reduced, and the mechanical concentration tank has the defects that chemical agents need to be added, and the investment is large.

Specifically, the heat source of the thermal drying device uses the residual heat in S08.

Specifically, a horizontal circular incineration area is arranged in the incinerator, a plurality of annular air supply pipelines are concentrically arranged below the circular incineration area, the surfaces of the plurality of annular air supply pipelines are provided with combustion nozzles in different numbers according to the size of the plurality of annular air supply pipelines, an ignition device is arranged on one side of each annular air supply pipeline, and a material stirring mechanism is arranged at the top of the incineration area in the incinerator; the material stirring mechanism rotates by taking the circle center of the top surface of the incineration area as a rotation center, and is used for stirring fuel particles and other fuels distributed on the surface of the incineration area to the center of the incineration area.

In this embodiment, the burning area is a circular plate, a large number of through holes are formed in the surface of the burning area, the aperture of each through hole is smaller than the particle size of fuel particles and other fuels, further, in order to ensure the working stability of the material poking mechanism, the material poking mechanism is composed of a plurality of circumferentially distributed material poking rods 1, the appearance of each material poking rod 1 is in a hook shape, a plurality of material poking sheets 2 are arranged at the bottom of each material poking rod 1 at equal intervals, the bottoms of the material poking sheets 2 are attached to the top surface of the burning area, and meanwhile, the material poking sheets 2 at the bottoms of every two adjacent material poking rods 1 are staggered with each other, that is, when the material poking mechanism rotates, the movement tracks of the material poking sheets 2 at the bottoms of every two adjacent material poking rods 1 are not overlapped with each other.

Specifically, the incineration temperature of the incineration area is gradually reduced outwards from the circle center, the incineration temperature at the circle center of the incineration area is 800-900 ℃, the edge incineration temperature of the incineration area is 180-250 ℃, and the annular air supply pipelines are respectively and independently connected with electromagnetic valves to independently control the air output of each annular air supply pipeline, so that the flame size of the corresponding combustion nozzle is adjusted, and the incineration temperature of the incineration area corresponding to the annular air supply pipeline is controlled.

In the embodiment, in the burning process, the fuel particles and other fuels are firstly conveyed to the edge of the burning zone, the fuel particles and other fuels are heated and dried at the temperature of 180-250 ℃, then the material stirring structure is started, the fuel particles and the like are gradually stirred to the center of the burning zone by the mutually staggered material stirring sheets 2, so that the dried fuel particles are ignited at the center of the burning zone, and meanwhile, the fuel particles and the like are continuously conveyed to the edge of the burning zone, so that the stability of fuel supply is ensured.

Specifically, the water content of the dry solid sludge in the S04 is 35-60%.

In the embodiment, although the moisture content of the dry and solid sludge still cannot reach below 30, the carbon content in the sludge is greatly improved by adding the composite dehydrating agent, compared with the traditional sludge with the same moisture content, the heat released after combustion is higher, and in the incineration process, fuel particles prepared from the dry and solid sludge are dried and then combusted through a multi-temperature range, so that the combustion efficiency can be effectively improved, and in the operation mode, the fuel particles at the edge of the combustion area can be dried and heated by the heat radiated to the periphery when the fuel particles at the center of the combustion area are combusted, so that the heat loss is reduced, the fuel gas consumption is saved to a certain extent, and the purpose of saving energy is achieved.

The working principle is as follows:

according to the invention, the composite dehydrating agent is added into the pre-dehydrated sludge, so that the moisture in the sludge can be effectively absorbed, the moisture content of the sludge is reduced, the sludge treatment steps are simplified, the sludge dehydration efficiency is improved, the sludge can be reused in a short time, and the sludge treatment cost is reduced.

Meanwhile, the lime and sulfamic acid components added in the composite dehydrating agent can enable the pH of the sludge to be in a strong alkaline state in the process of treating the sludge, thereby effectively killing microorganisms in the sludge, removing odor in the sludge, realizing harmless treatment of the sludge, precipitating most metal ions in the sludge by high pH, and reducing the solubility and activity degree of the metal ions; so as to improve the solid content of the sludge.

According to the invention, the carbon content in the sludge is greatly increased by adding the composite dehydrating agent, compared with the traditional sludge with the same water content, the heat released after combustion is higher, and in the incineration process, fuel particles prepared from dry and solid sludge are dried and combusted through multiple temperature intervals, so that the combustion efficiency can be effectively improved, the water content condition for recycling sludge resources is reduced to a certain extent, and in the operation mode, the fuel particles at the edge of the combustion area can be dried and heated by the heat radiated to the periphery when the fuel particles at the center of the incineration area are combusted, so that the heat loss is reduced, the fuel gas consumption is saved to a certain extent, and the purpose of saving energy is achieved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.