CN207276449U - Sludge treating system - Google Patents

Abstract

The utility model provides a sludge treatment system, which includes a closed pretreatment station, a sludge derivation system, a drying and grinding system and a cement kiln system; the closed pretreatment station is provided with a sludge storage tank, a sludge mixer and a belt Conveyor; drying and grinding system includes vertical casing dispersing and grading drying furnace, pulverizer, tube dryer and cyclone dust collector; vertical casing dispersing and grading drying furnace and cement kiln, powder The air pipes of the mill and the tube dryer are connected; the air pipe of the tube dryer is connected with the cyclone dust collector, the cement kiln tail smoke chamber is connected with the kiln tail preheating system; the cement kiln tail smoke chamber is connected with the cement production line . The sludge treatment system effectively overcomes the negative factors in the process of co-processing sludge in cement kiln production, compulsorily carries out anti-corrosion modification on sludge, reasonably handles waste gas and moisture in sludge, and effectively controls all aspects of sludge brought into cement kiln. An effective element to avoid affecting the working conditions of the cement kiln and realize the harmless treatment of sludge.

Description

Sludge Treatment System

technical field

The utility model relates to the technical field of sludge treatment, in particular to a sludge treatment system.

Background technique

Cement kiln co-processing of solid waste (including domestic garbage and sludge) refers to waste disposal for the purpose of decomposition, degradation, elimination, inertization and stabilization of solid waste's toxic characteristics through high-temperature incineration and high-temperature sintering process of cement clinker mineralization means. Cement kiln treatment has the technical advantages of wide application range, large consumption capacity, strong adaptability to various wastes, large heat capacity, large thermal inertia and high heat transfer efficiency. The core of cement kiln co-processing urban domestic sludge technology is to make use of domestic sludge, combustible components in waste and ash materials in the cement production process, and apply appropriate technical solutions to make sludge harmless and reduce of resources, resources and energy.

In recent decades, the co-processing of solid waste in cement kilns has developed rapidly. The State Council's "Several Opinions on Accelerating the Structural Adjustment of the Cement Industry" stated: "On the basis of sufficient experimental research, improve the standard system, guide the cement industry to scientifically and rationally use and process waste". During the "Eleventh Five-Year Plan" period alone, the cement industry used more than 400 million tons of solid waste, and built a number of technical demonstration projects for the harmless co-processing of urban domestic sludge, urban sludge and various solid wastes in cement kilns. The provisions of the "Basel Convention" mentioned that "the co-processing of hazardous waste in the cement production process has been considered as an environmentally sound treatment measure"; the technology of co-processing solid waste in cement kilns has been widely recognized in western developed countries and apply. The "Technical Specifications for Cooperative Disposal of Solid Waste in Cement Kilns" promulgated in 2014 clarified the basic principles and technical direction for the co-processing of solid waste in cement kilns.

At present, the co-processing technology of urban domestic sludge in cement kiln has also been developed rapidly, because the main components in sludge ash are SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ and CaO (accounting for more than 85%) and cement Clay raw materials are similar, and can replace clay for cement raw materials. At the same time, sludge contains a certain amount of calorific value. Generally, sludge with a water content of 50% has a calorific value of 6000-8000kJ/kg. After incineration, it can replace part of coal for clinker burning. In this way, the sludge can be used as an alternative raw material (fuel) for cement production for harmless and resourceful disposal. Some directly add sludge to raw meal mill and grind raw meal together to make raw meal powder with low calorific value; some add sludge to coal mill and grind together with coal to make coal slime mixed fuel; Spray directly into the cement kiln for incineration. These methods all have the following several technical problems that must be further processed:

1. How to effectively deal with the problems of high moisture content of sludge, difficulty in drying and high heat consumption.

①. The moisture content of the sludge is high, and direct incineration in the cement kiln will destroy the stability of the cement kiln firing system. The potential moisture content of sludge is high, generally at 80%, and even higher than 90%. Because its macromolecular flocculation system is difficult to dehydrate mechanically, even if dehydration increases the burden of water treatment, it is easy to cause secondary water pollution. If it is directly incinerated in a cement kiln, a large amount of moisture in the incineration will make the sludge difficult to burn, and a large amount of water vapor generated during the combustion will increase the humidity of the cement kiln flue gas, reduce the system temperature, and bring great benefits to the safe operation of the cement kiln and energy saving and consumption reduction. Negative impact. Especially for the CaO that has been decomposed in the decomposition kiln, it will easily absorb water, which will reduce the decomposition rate of CaO entering the kiln, thereby affecting the output of the cement kiln. Therefore, in the sludge incineration process, most of them set up independent sludge incinerators to incinerate sludge, while the process of direct incineration in cement kilns is relatively difficult to achieve.

②. The moisture content of the sludge is high, and adding it directly to the raw meal mill or coal mill will also cause difficulty in drying. Cement raw materials and coal both contain a certain amount of moisture. Cement dry-process kilns must control the moisture content of raw materials and coal mills entering the kiln. The drying and grinding process used in the design has strict requirements on the moisture content of raw materials. If the sludge with high water content is mixed into the raw meal or coal mill, the moisture content of the raw material entering the mill will exceed the standard, and the grinding system has to be changed. For example, in order to mix sludge into the coal mill, a factory has to introduce 350°C hot air into the coal mill. Long-term operation will damage the hollow bearing of the mill. Moreover, the air volume of the dust collection system of the mill cannot match, and it is impossible to carry out applicability transformation for the cement plant that has been built. If the transformation is carried out, the investment is huge, and the gain outweighs the loss.

③. Sludge is made into raw meal, which will produce dioxin when put into the kiln for calcination together with raw meal. Because sludge can be burned below 500°C, that is, after entering the kiln system together with raw materials, the sludge will be burned in the third-stage cylinder, and it cannot be burned at a high temperature above 850°C to prevent the production of dioxins. At the same time, the alkaline environment of the third-stage cylinder of the cement kiln is not very strong, because CaCO ₃ cannot be decomposed at around 500°C. Therefore, this method loses the favorable conditions for the harmless disposal of sludge by high-temperature alkaline incineration in cement kilns, and cannot realize the harmless disposal of sludge.

④. Mixing sludge and coal to make coal slime mixed fuel will reduce the absolute calorific value of pulverized coal entering the kiln, which is an insurmountable threshold for the cement industry that already uses low calorific value coal. For this reason, expensive combustion accelerants are added, and low-cost disposal cannot be realized.

⑤. The direct drying process of urban domestic waste generally adopts the original rotary dryer system, which has low drying efficiency, high thermal efficiency and large investment. It is quite difficult to dry high water content sludge.

2. How to effectively deal with the problems of odor and toxic and harmful gases in the process of urban domestic sludge treatment.

There are some easily decomposed organic substances in urban domestic sludge, which decompose into unpleasant odor and toxic and harmful gases under certain conditions. Therefore, the process of sludge storage, transportation, drying, and incineration will produce a high concentration of malodorous gases, mainly hydrogen sulfide, mercaptan and methyl mercaptan. In particular, mercaptan and methyl mercaptan are highly adhesive, and when adsorbed on clothes such as fabrics, they produce unspeakable stench. In the existing methods for drying municipal domestic sludge with waste heat, whether indirect drying or direct drying is used, a large amount of the above-mentioned malodorous gases will inevitably be produced, resulting in environmental deterioration in the production area.

Generally, the current effective method is to put the dry process tail gas containing a large amount of malodorous gas into the kiln for incineration. This method must separate the water vapor, but it will cause a significant increase in sludge disposal costs and equipment investment, and a large amount of separated tail gas Entering the kiln will cause the working condition of the cement kiln to be unstable and affect the cement production. Another method is to introduce the dry tail gas containing a large amount of malodorous gas into the discharge system of the cement kiln. This method needs to increase the absorption solvent and the absorption tower, and the absorbed hydrogen sulfide, mercaptan and methyl mercaptan face secondary pollution and Problems to deal with.

CN 201410792166.1 discloses a method for disposing sludge in a cement kiln and a sludge gasification cement kiln system. The method for disposing sludge in a cement kiln is to first make wet sludge into dry sludge particles, and then dry the sludge The mud particles are gasified, and then the gas obtained after gasification is sent to the calciner, and the ash obtained after gasification is sent to the raw material system. The sludge gasification cement kiln system includes a cement kiln and a calciner, the inlet of the cement kiln communicates with the outlet of the calciner, and the gas inlet of the calciner and the gas outlet of the gasifier pass through a gas pipeline The feed port of the gasifier is connected with the material warehouse through the conveying system, and the slag outlet of the gasifier is connected with the raw meal system through the slagging system. The patent mentions that a large amount of additional fuel is required for vaporization during the sludge vaporization process, which greatly increases the operating cost, does not actively take advantage of the advantages of the cement kiln, and has certain limitations.

Therefore, in order to improve the ability of cement kiln to co-treat sludge and improve the adaptability of sludge, a new sludge treatment system is urgently needed.

Utility model content

Aiming at the deficiencies of the existing technology, the utility model provides a sludge treatment system, which can effectively overcome the negative influence factors in the process of synergistic treatment of sludge in cement kiln production, compel anti-corrosion modification of the sludge, and reasonably treat the abnormalities in the sludge. Odor gas, harmful gas and moisture, effectively control various effective elements brought into the cement kiln by sludge, avoid affecting the working conditions of the cement kiln, completely eliminate the risk of secondary pollution, environmentally friendly, safe production, and realize harmlessness, resources and Treatment of urban domestic sludge, etc.

In order to achieve the above object, the utility model provides the following technical solutions:

On the one hand, the utility model provides a sludge treatment system, including a closed pretreatment station, a sludge-derived cement raw material preparation system, a drying and grinding system and a cement kiln system;

The cement kiln system includes a cement kiln tail dust collection system, a cement kiln tail smoke chamber, etc.;

According to the sludge treatment process, the closed pretreatment station is provided with a sludge storage tank, a sludge mixer and a belt conveyor in sequence; The feed port is connected; the discharge port of the sludge mixer is connected with the sludge-derived cement raw material preparation system through a belt conveyor; export connection;

The sludge-derived cement raw material preparation system includes an aging bin;

The discharge port of the sludge mixer is connected to the feed port of the aging bin through a belt conveyor, and the discharge port of the aging bin passes through a box feeder, a belt scale, an iron remover, a belt conveyor and a drying and grinding system. connect;

The drying and grinding system includes a vertical casing dispersing and classifying drying furnace, a pulverizer, a tube dryer and a cyclone dust collector;

The material enters from the feed port of the vertical casing breaking and grading drying furnace through a belt conveyor;

The air inlet of the vertical casing dispersing and classifying drying furnace is connected with the hot air outlet of the cement kiln;

The discharge port of the vertical casing dispersing and grading drying furnace is connected with the feed port of the pulverizer; the air outlet of the vertical casing dispersing and grading drying furnace is connected with the air duct of the tubular dryer. connected to the air inlet;

The discharge port of the pulverizer is connected with the feed port of the vertical casing dispersing and grading drying furnace through the hoist;

The air outlet of the air duct of the tubular dryer is connected with the air inlet of the cyclone dust collector,

The air outlet of the cyclone dust collector is connected with the cement kiln tail dust collection system through the blower fan;

The discharge port of the cyclone dust collector is connected with the feed port of the cement kiln tail smoke chamber through the sludge dry powder bin, the screw scale, and the spiral air lock;

The air outlet of the cement kiln tail smoke chamber is connected with the air inlet of the kiln tail preheating system; the discharge port of the cement kiln tail smoke chamber is connected with the cement production line.

Further, the air outlet of the closed pretreatment station is connected to the air inlet of the deodorization and odor eliminator through the exhaust fan; the air outlet of the deodorization and odor eliminator is connected to the primary fan of the pulverized coal burner at the kiln tail .

Further, an anti-corrosion modifier spray head is provided directly above the sludge storage tank; the anti-corrosion modifier spray head is connected to the chemical preparation room through a pipeline.

Further, the medicament preparation room is also connected to the feed port of the sludge mixer through a pipeline.

Further, the sludge mixer includes a concrete mixer. Examples include an on-disk mixer or a stand mixer.

Further, the vertical casing dispersing and grading drying furnace includes a device body, the device body includes a cylinder body, a feed inlet, a material outlet, an air inlet and an air outlet arranged on the cylinder body, and the cylinder body includes The outer casing, the inner cylinder and the V-shaped casing; the V-shaped casing is connected to the bottom of the inner cylinder; the outer casing is sleeved outside the inner cylinder; the feed port is arranged above the V-shaped casing The air inlet is arranged on the side of the V-shaped casing; the discharge outlet is arranged under the V-shaped casing; the air outlet is arranged on the lower side of the outer casing; the air inlet is provided with A deflector, the deflector includes a fixed shaft, a deflector vane arranged on the fixed shaft, a fixed bolt, a movable cover plate, a direction adjustment rod and a direction rod fixing bolt; the side of the V-shaped housing is provided with An installation window that matches the movable cover; the movable cover is fixed in the installation window by adjusting bolts; one end of the fixed shaft is installed on the V-shaped housing through the fixing bolt, and the other end is installed on the movable cover through the fixing bolt on the board; one end of the direction adjusting rod is connected to the end of the fixed shaft installed on the movable cover; the other end is installed on the V-shaped housing through the fixing bolt of the direction rod; the feeding port is provided with a breaking device, The dispersing device includes a bearing seat arranged on the V-shaped housing, a bearing connected with the bearing seat, and a rotating shaft arranged on the bearing, and the bearing seat is connected with the power unit through a pulley and a belt; the power unit is provided with Outside the cylinder; hammerheads are arranged on the rotating shaft; the hammerheads are staggeredly arranged on the rotating shaft.

Further, the hot air outlet of the cement kiln communicates with the hot air outlet of the cement kiln tail smoke chamber bypass air outlet and the hot air outlet of the waste heat power generation system at the kiln tail.

Compared with the prior art, the utility model has the following advantages:

The utility model provides a sludge treatment system. The system adds an anti-corrosion modifier to the sludge through an anti-corrosion modifier nozzle to modify and eliminate odors, and then adds alkaline modification through strengthening modifier bins and crushed limestone bins. After drying and grinding, the hot air drying and grinding of the cement kiln is used for sorting, and the small particle materials are selected for incineration, so as to reduce the sludge moisture or sludge waste gas to the safe operation of the cement kiln system as much as possible. The adverse effects brought by it can reduce secondary pollution, ensure the harmless, low-cost, and low-investment treatment of sludge, and are in line with the direction of sustainable development of circular economy.

1) Eliminate the adverse effects of excessive sludge moisture on the cement kiln system: by treating the moisture in the sludge outside the cement kiln, the moisture in the sludge can be isolated from the cement kiln to the maximum extent, reducing the impact of excessive sludge moisture on the kiln. system impact. Compared with the current sludge incineration or sludge vaporization incineration, the sludge treatment system of the present invention can effectively eliminate the adverse effects of water filtration in the sludge on the cement kiln system, and can reduce the CaO decomposition rate caused by the entry of cement materials into the cement kiln. Negative impact, avoiding the impact on the output of the cement kiln system, eliminating the impact of the combustion of pulverized coal due to the water vapor occupying the normal air volume during the sludge treatment process, etc.

2) Effectively suppress and eliminate the generation of odor and harmful toxic gas in the process of sludge disposal: through the use of anti-corrosion modifiers, alkaline modifiers, and raw meal powder to strengthen the modification of sludge and reduce moisture , can convert the malodorous gas components of hydrogen sulfide, mercaptan and methyl mercaptan that may occur in the sludge treatment process into sulfide, alkoxide, etc., so that the malodorous gas components can be solidified into solid-phase dry granular materials (that is, sludge derived Cement raw materials), it will not emit in low-temperature drying gas, eliminate the hazard of secondary pollution, and create necessary conditions for subsequent sludge drying.

3) Saving heat consumption and reducing sludge disposal costs: The low-temperature hot air discharged from the kiln tail waste heat power generation system in the cement kiln and the high-temperature hot air discharged from the kiln tail smoke chamber are mixed as drying hot air for drying, and the temperature is effectively controlled at 400 Below ℃, the sludge is only dehydrated, basically does not burn, avoids the production of toxic and harmful gases such as dioxin, and reduces the influence of harmful elements on the working conditions of the cement kiln and the harm to the quality of cement clinker to a certain extent, and can effectively use cement The hot exhaust gas of the kiln saves energy.

4) Improve sludge combustion efficiency and sludge treatment capacity: By using anti-corrosion modifiers, alkaline modifiers, and raw meal powder to strengthen and modify sludge, hydrogen sulfide and sulfur that may occur in the sludge treatment process can be reduced. Alcohol and methyl mercaptan malodorous gas components are converted into sulfide salts, alkoxides, etc., so that the malodorous gas components can be solidified into solid-phase dry granular materials (ie, sludge-derived cement raw materials), which is convenient for storage and transportation, and is conducive to subsequent drying. Drying and grinding to achieve effective control of sludge moisture; after grinding and drying, the small particle sludge is sent to the cement kiln for incineration, the moisture and particle size of the sludge are effectively controlled, which is beneficial to the sludge Decomposition and combustion is beneficial to the burning of cement clinker, and effectively eliminates harmful gases such as dioxins produced by sludge incineration. It can bring higher fuel substitution rate and sludge treatment volume. It can not only treat domestic sludge with high water content, but also semi-dry sludge dewatered by pressure filtration. It is also suitable for other high water content wastes, such as stale sludge, kitchen sludge, slaughter waste, food industry sludge etc.

5) Sludge high-temperature alkalization incineration realizes truly harmless and resourceful treatment: the dried and ground sludge is directly incinerated in the tail smoke chamber of the cement kiln, which is one of the best ways for harmless incineration of sludge. The existing sludge incineration process is difficult to incinerate due to the low calorific value of sludge. Even if it is incinerated, it is difficult to ensure incineration in a high temperature environment above 850 ° C. The incineration process may produce harmful gases such as dioxins. The tail smoke chamber of the cement kiln has a high-temperature environment of 950-1100 ° C. Due to the presence of a large amount of CaO after the decomposition of cement raw meal, a strong alkaline environment is formed, which has a complete neutralization effect on acid gases such as chlorine and sulfur produced by sludge incineration. The incompletely incinerated sludge enters the cement kiln and is further incinerated at a high temperature of 1100-450°C to be completely treated. The ashes after sludge incineration become cement clinker components, truly realizing harmless and resourceful treatment.

6) Using mature disposal equipment, the process is simple and reliable: adopt domestic mature cement machinery equipment such as conveying, metering, and grinding equipment, and improve it according to the characteristics of the sludge, and then use the vertical casing for sludge drying to disperse and classify the drying Dry furnace, the equipment is practical and reliable, and the price is low, so as to save engineering cost and investment.

7) Low cost of sludge disposal: The modifiers used in sludge are mainly lime and limestone, which are low in price and convenient for production and storage, which can reduce the use of expensive modifiers and save disposal costs; sludge is dried using cement kilns The low-temperature waste heat and low-temperature hot air of the system are processed to save the heat loss caused by sludge drying and save drying costs; the sludge drying is completed outside the cement kiln system, reducing the impact on the kiln system and reducing the excessive moisture content of the sludge The impact on the working conditions of the cement kiln, the excess heat after sludge combustion is completely used for clinker firing, reducing the coal consumption of cement firing; the sludge ash is used for cement clinker, saving cement production material consumption and reducing cement clinker materials Low cost, saving natural resources; low project investment, saving the cost of sludge disposal.

The treatment system of the utility model makes full use of the special advantages of the cement kiln, realizes the reduction of infrastructure investment, improves the sludge treatment capacity and the applicability of the sludge, and is a harmless, resourceful and low-cost treatment system.

The entire sludge treatment process is in a sealed environment, and after deodorization and odor treatment, the generated waste gas can be discharged cleanly and will not cause secondary air pollution; the residue generated during the sludge incineration process is used for cement clinker, which can effectively Secondary utilization, the waste gas generated is treated by the kiln tail waste gas treatment system, completely eliminating the risk of secondary pollution, and achieving environmental and production safety.

The processing system of the utility model has simple and reliable process, adopts the existing cement kiln system, has low operation cost and is sustainable.

Description of drawings

The schematic diagram of the structure of the sludge treatment system in Fig. 1;

Fig. 2 Schematic diagram of the structure of the vertical casing dispersing and grading drying furnace.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Apparently, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as the technical solution. Combination does not exist, nor is it within the scope of protection required by the utility model.

Example 1

As shown in Figures 1-2, the utility model provides a sludge treatment system, including a closed pretreatment station, a sludge-derived cement raw material preparation system, a drying and grinding system and a cement kiln system;

The cement kiln system includes a cement kiln tail dust collection system, a cement kiln tail smoke chamber, etc.;

According to the sludge treatment process, the closed pretreatment station is provided with a sludge storage tank 1, a sludge mixer 2 and a belt conveyor in sequence; The feed port of the sludge mixer 2 is connected; the discharge port of the sludge mixer 2 is connected with the sludge-derived cement raw material preparation system through a belt conveyor; the feed port of the sludge mixer 2 is also connected with the strengthening modifier The outlets of the warehouse 6 and the raw meal powder warehouse 7 are connected; the air outlet of the closed pretreatment station is connected with the air inlet of the deodorization and odor eliminator 8 through the exhaust fan; the outlet of the deodorization and odor eliminator 8 The gas port is connected with the primary fan of the pulverized coal burner at the kiln tail;

An anti-corrosion modifier spray head is arranged directly above the sludge storage tank 1; the anti-corrosion modifier spray head is connected to the medicament preparation room 9 through a pipeline. The medicament preparation room 9 is also connected to the feed port of the sludge mixer 2 through a pipeline. On the basis of ensuring the storage capacity, the sludge storage tank 1 ensures the convenience of transportation as much as possible, reduces repeated operations, and minimizes the working time of personnel in the closed pretreatment station to ensure environmental protection and safe production, save investment and reduce operating costs . Warehouse storage saves land and is convenient for odor collection and treatment. It can be set up in two ways, underground or above ground, according to the terrain. No matter which method is used, the car is directly unloaded and stored in the warehouse after entering the closed pretreatment station. The angle of the bottom of the sludge storage tank 1 is set to be greater than 65°, and the discharge port is set as large as possible to ensure smooth discharge. The storage period is not less than 5 days.

The sludge mixer 2 generally adopts a concrete mixer, such as a disc mixer or a horizontal mixer.

The sludge-derived cement raw material preparation system includes an aging bin 10; the aging bin 10 can be stored in a closed round steel silo, and the storage period is not less than 4 hours. The bottom of the aging warehouse 10 adopts a wide outlet, and the box-type feeder 11 is used to force the material to be discharged. The aging warehouse 10 is equipped with a vibrator to prevent material from being stuck.

The discharge port of the sludge mixer 2 is connected to the feed port of the aging bin 10 through a belt conveyor, and the discharge port of the aging bin 10 passes through a box feeder 11, a belt scale 12, an iron remover 13, and a belt conveyor. Connect with drying and grinding system;

The drying and grinding system includes a vertical casing dispersing and classifying drying furnace 3, a pulverizer 14, a tubular dryer 15 and a cyclone dust collector 16;

The material enters from the feeding port of the vertical casing to break up the classification drying furnace 3 through a belt conveyor;

The air inlet of the vertical casing dispersing and classifying drying furnace 3 is connected with the hot air outlet of the cement kiln;

The discharge port of the vertical casing dispersing and classifying drying furnace 3 is connected with the feed port of the pulverizer 14; The air inlet of the air duct of 15 is connected;

The discharge port of the pulverizer 14 is connected with the feed port of the vertical casing dispersing and classifying drying furnace 3 through the hoist 17;

The air outlet of the air duct of the tube dryer 14 is connected with the air inlet of the cyclone dust collector 16,

The air outlet of the cyclone dust collector 16 is connected with the cement kiln tail dust collection system through a blower fan;

The discharge port of the cyclone dust collector 16 is connected with the feed port of the cement kiln tail smoke chamber 5 through the sludge dry powder bin 18, the screw scale, and the screw air lock 19;

The air outlet of the cement kiln tail smoke chamber 5 is connected with the air inlet of the kiln tail preheating system; the discharge port of the cement kiln tail smoke chamber is connected with the cement production line. The vertical casing dispersing and grading drying furnace includes a device body, and the device body includes a cylinder body 31, a material inlet 32, a material outlet 33, an air inlet 34 and an air outlet 35 arranged on the cylinder body 31. The cylinder 31 includes an outer casing 36, an inner cylinder 37 and a V-shaped casing 38; the V-shaped casing 38 is connected to the bottom of the inner cylinder 37; the outer casing 36 is sleeved outside the inner cylinder 37; The feed port 32 is arranged above the V-shaped casing 38; the air inlet 34 is arranged on the side of the V-shaped casing 38; the discharge port 33 is arranged below the V-shaped casing 38; the air outlet 35 is arranged on the lower side of the outer casing 36; the air inlet 34 is provided with a guide device 39, and the guide device 39 includes a fixed shaft, a guide vane arranged on the fixed shaft, a fixed bolt, a movable cover plate, direction adjustment rod and direction rod fixing bolt; the side of the V-shaped housing 38 is provided with an installation window that matches the movable cover; the movable cover is fixed in the installation window by adjusting bolts; the fixed One end of the shaft is installed on the V-shaped housing 38 through a fixing bolt, and the other end is installed on the movable cover through a fixing bolt; one end of the direction adjusting rod is connected with the end of the fixed shaft installed on the movable cover; the other end Installed on the V-shaped housing 38 by the direction bar fixing bolt; the feed port 32 is provided with a break-up device 40, and the break-up device 40 includes a bearing seat arranged on the V-shaped housing 38, connected with the bearing seat The bearing, the rotating shaft arranged on the bearing, the bearing seat is connected with the power device through the pulley and the belt; the power device is arranged outside the cylinder 31; the rotating shaft is provided with a hammer head; the hammer head is staggered set on the axis of rotation. The vertical sleeve dispersing and grading drying furnace takes into account the functions of dispersing and grading, and can also have the drying function through a large amount of hot air. After the material is ground by the pulverizer 14, it returns to the vertical casing to disperse and classify the drying furnace and circulates again to realize the cycle of drying, dispersing, grading and pre-drying, which can ensure the drying effect. The selected small particle materials enter the air duct for further drying. Because the material is suspended in the hot air, and the particle size of the material is small, the heat exchange efficiency is high, the drying speed is fast, and the drying effect is good.

The hot air of the cement kiln comes from the hot air released from the bypass of the tail smoke chamber of the cement kiln and the hot air from the waste heat power generation system at the kiln tail.

Using the sludge treatment system provided by the utility model to carry out sludge treatment, specifically includes the following steps:

Step 1) Sludge pretreatment: The sludge is transported by a special vehicle for sludge entering the factory, and after being sterilized by the disinfection workshop, it enters the closed pretreatment station, unloads the sludge into the sludge storage tank, adds anti-corrosion modifier and mixes it evenly before storing; The anti-corrosion modifier can inhibit and eliminate the chemical substances that produce odor and destroy the macromolecular flocculation components of sludge, thereby inhibiting and eliminating the odor generated during sludge transportation, storage, drying and incineration, which is beneficial to sludge Dry and dehydrate. During the storage process, the closed pretreatment station is ventilated to form a slight negative pressure state, and the gas is discharged after deodorization and odor treatment. The anti-corrosion modifier includes one or more of strong alkali, surfactant and chloride salt; the added amount of the anti-corrosion modifier is 0.5-2% of the solid weight of the sludge after drying. Anti-corrosion modifiers are formulated on-site.

Step 2) Preparation of sludge-derived cement raw materials: The pretreated sludge in step 1) is output from the bottom of the sludge storage tank through the sludge pump conveyor and then sent to the mixer, and at the same time, alkaline water with a particle size of less than 5mm is added to the mixer. The modifier and raw meal powder are mixed evenly and then aged by belt conveyor to the aging warehouse for 4-8 hours to obtain sludge-derived cement raw materials; alkaline modifiers include crushed limestone and strengthening modifiers, The strengthening modifier is one or more of lime, clinker, carbide slag, steel slag, etc., and the amount of the basic modifier is 3-10% of the total weight of the sludge.

Step 3) Drying and grinding: The sludge-derived cement raw materials are discharged at the bottom of the aging warehouse by a box-type feeder and measured by a belt scale, and then directly enter the vertical casing dispersing and grading drying furnace for dispersing, grading and drying , the material is dried and dehydrated in a large amount of hot air, and the small particle material and the large particle material are sorted out. The sorted small particle material is dispersed by the vertical casing and the air discharged from the classification drying furnace is wrapped into the air duct for suspension drying. Then it is exhausted and collected by the cyclone dust collector; after further grinding, the large particle material enters the vertical sleeve dispersing and grading drying furnace again, and the process of dispersing, grading, drying and grinding is repeated until all the sludge is uniform into small particles; the hot air of the vertical sleeve dispersing graded drying furnace comes from the hot air discharged from the waste heat power generation system at the kiln tail or the hot air discharged from the bypass of the smoke chamber at the kiln tail or the hot air mixed with the two. The temperature of the low-temperature hot air after the waste heat power generation system at the kiln tail is greater than 200°C. When the temperature is insufficient, it can be adjusted by the high-temperature hot air at about 950°C drawn from the kiln tail smoke chamber. The 100°C wind discharged from the cyclone dust collector is directly sent to the cement kiln tail dust collection system for purification and treatment before being discharged.

Step 4) Sludge incineration: Send small particle materials into the tail smoke chamber of the cement kiln for incineration. The temperature of the kiln tail smoke chamber is generally higher than 950°C. Since the raw meal decomposition rate in the cement kiln tail smoke chamber is greater than 90%, the CaO content is extremely high, and the alkalinity is extremely high, the sludge incineration here actually has the characteristics of high-temperature alkalization incineration. It is beneficial to eliminate harmful gases and will not produce dioxins. The incremental heat generated by the sludge through high-temperature alkalization combustion in the kiln is directly used for clinker firing, and can replace part of the coal used for firing. The ash enters the cement kiln and continues to be calcined into cement clinker components, thereby realizing Recycling and harmless treatment of sludge. Step 4) The incinerated gas is processed by the waste gas treatment system at the kiln tail to realize clean discharge, and the incinerated residue is further entered into the cement kiln to be calcined into cement clinker components.

The system described in the utility model can not only treat domestic sludge with high water content, but also semi-dry sludge after pressure filtration and dehydration, and is also applicable to other wastes with high water content, such as stale sludge and kitchen waste. mud, slaughter waste, food industry sludge, etc.

The harmless incineration of sludge is itself an environmental protection project. Therefore, in the sludge incineration process, it must first be ensured that there will be no possibility of secondary pollution. It will not increase the incremental emission of dust and other harmful substances under the existing environmental protection conditions of the cement line. During the implementation process, it mainly pollutes the air environment. The main pollutants are dust and harmful gases. The following measures are mainly adopted to eliminate pollution and protect the environment.

1) Prevention and treatment of odor in the sludge pretreatment section

Setting up a closed pretreatment station and storing sludge in a closed pretreatment station, and adopting forced mechanical ventilation can effectively prevent the spread of odorous gases.

After the sludge enters the closed pretreatment station, it is sprayed with sterilizing and disinfecting agents to eliminate organic germs and prevent the sludge from further rotting and deteriorating to produce odor.

In the process of sludge transportation, derivation, drying, and sorting, windshields are used, and forced mechanical ventilation is adopted, which can effectively prevent the diffusion of odorous gases.

All the sucked gas containing odor is connected to the primary fan at the end of the kiln for wind, and is directly sent to the smoke chamber at the end of the kiln for high-temperature oxidation treatment to completely eliminate the odor. Or use a different ozonation catalyst to force treatment and eliminate the odor before discharging.

2) Dust control

Sludge is a wet material, and no dust will be generated during storage, transportation, crushing and sorting. Dust will be generated during drying, grinding and incineration, the specific measures are as follows:

The aging warehouse will not produce dust, the conveying and lifting equipment are all airtight equipment, a small amount of ventilation makes it run under a slight negative pressure, no dust will be generated, the sucked gas enters the drying circulation air system, and no redundant emissions are generated point.

Both the drying and incineration systems adopt high negative pressure induced air operation, and there will be no air leakage to the outside. After all the gas passes through the system for cyclone dust removal, the dust content is lower than that of the first-stage flue gas at the kiln tail, and then enters the cement plant. The dust collection system at the kiln tail is treated uniformly. According to calculations, the amount of gas required by the utility model is the exhaust gas circulation after kiln waste heat power generation, without increasing the total air volume of the cement kiln system, and without additional dust removal facilities.

3) Prevention and control of harmful gases

Because sludge contains chlorine-containing substances such as salt and plastics, harmful gases such as HCl and dioxin will be produced when sludge is incinerated. According to experience, the temperature produced by dioxin is below 700°C, so the system design of this utility model adopts the method of sending the sludge into the decomposition furnace at the end of the cement kiln for incineration at a high temperature of 950°C, and there will be no possible conditions for the formation of dioxin during incineration , Effectively control the production of dioxins.

At the same time, acid gases such as Cl ^- and SO ₂ produced by sludge incineration are surrounded by a large amount of CaO in the cement kiln, and are quickly neutralized into CaCl ₂ and CaSO ₄ and enter the clinker. A part of K and Na form KCl, NaCl, K ₂ SO ₄ , Na ₂ SO ₄ after being burned with sludge. The alkali metal potassium salt and sodium salt evaporate at high temperature to form gas, and the gas condenses at low temperature to form solid. A large amount will cause skinning and blockage of the preheater, and at the same time, it will also cause Cl ^- in the cement to exceed the standard and affect the quality of the cement. Bypass ventilation technology can be used when necessary.

4) Treatment of sludge seepage

During the sludge treatment process, a small amount of seepage and sewage generated during the sanitary cleaning of equipment will be discharged. These two parts of sewage can be collected in the sludge seepage pool, and sent to the sludge storage pool for treatment together with the sludge. , no external discharge.

The treatment system of the utility model makes full use of the special advantages of the cement kiln, realizes the reduction of infrastructure investment, improves the sludge treatment capacity and the applicability of the sludge, and is a harmless, resourceful and low-cost treatment system.

The entire sludge treatment process is in a sealed environment, and after deodorization and odor treatment, the generated waste gas can be discharged cleanly and will not cause secondary air pollution; the residue generated during the sludge incineration process is used for cement clinker, which can effectively Secondary utilization, the waste gas generated is treated by the kiln tail waste gas treatment system, completely eliminating the risk of secondary pollution, and achieving environmental and production safety.

The processing method and processing system of the utility model have simple and reliable process, adopt the existing cement kiln system, have low operation cost and are sustainable.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. a kind of sludge treating system, it is characterised in that prepare system including closed preprocessing station, derived from sludge cement raw material System, drying grinding system and quality coal in cement kiln systems；

The quality coal in cement kiln systems includes cement kiln end dust collecting system, cement kiln end smoke-box；

It is defeated that by sludge handling process sewage sludge storage pond, sludge stirring machine and belt are disposed with the closed preprocessing station Send machine；The discharge port in the sewage sludge storage pond is connected by the feed inlet of sludge pump, conveyance conduit and sludge stirring machine；The dirt The discharge port of mud mixer is connected by belt conveyor with derived from sludge cement raw material preparation system；The sludge stirring machine Outlet of the feed inlet also with reinforcing modifier storehouse, raw material powder cabin is connected；

The derived from sludge cement raw material preparation system includes aging bunker；

The discharge port of the sludge stirring machine is connected by the feed inlet of belt conveyor and aging bunker, the discharging of the aging bunker Mouth is connected through box-type feeder, belt conveyer scale, iron remover, belt conveyor with drying grinding system；

The drying grinding system includes vertical sleeve scattering and grading drying oven, flour mill, tubular type dryer and rotoclone collector；

The material is entered by belt conveyor from the feed inlet of vertical sleeve scattering and grading drying oven；

The air inlet of the vertical sleeve scattering and grading drying oven is connected with the hot-blast outlet of cement kiln；

The discharge port of the vertical sleeve scattering and grading drying oven is connected with the feed inlet of flour mill；The vertical sleeve is broken up point The air outlet of level drying oven is connected with the air inlet of the air hose of tubular type dryer；

The boosted machine of discharge port of the flour mill is connected with the feed inlet of vertical sleeve scattering and grading drying oven；

The air outlet of the air hose of the tubular type dryer and the air inlet of rotoclone collector connect,

The air outlet of the rotoclone collector is connected through wind turbine with cement kiln end dust collecting system；

Feed inlet of the discharge port of the rotoclone collector through sludge dry powder storehouse, helix balance, spiral lock wind and cement kiln end smoke-box Connection；

The gas outlet of the cement kiln end smoke-box is connected with the air inlet of kiln tail pre-heating system；The discharging of the cement kiln end smoke-box Mouth is connected with cement producing line.

2. sludge treating system according to claim 1, it is characterised in that the gas outlet warp of the closed preprocessing station Exhaust fan is connected with the air inlet of deodorization and off-flavor elimination device；Fired with kiln tail coal dust the gas outlet of the deodorization and off-flavor elimination device Burner primary air fan connects.

3. sludge treating system according to claim 1, it is characterised in that the sewage sludge storage pond is arranged above Anti-corrosion modifying agent nozzle；The anti-corrosion modifying agent nozzle between pipeline and medicament allotment by connecting.

4. sludge treating system according to claim 3, it is characterised in that also pass through pipeline and dirt between the medicament allotment The feed inlet connection of mud mixer.

5. sludge treating system according to claim 1, it is characterised in that the sludge stirring machine is stirred including concrete Machine.

6. sludge treating system according to claim 1, it is characterised in that the vertical sleeve scattering and grading drying oven bag Apparatus body is included, the apparatus body includes cylinder, the feed inlet being arranged on cylinder, discharge port, air inlet and air outlet, institute Stating cylinder includes overcoat housing, inner cylinder and V-type housing；The V-type housing is connected to the bottom of inner cylinder；The overcoat housing is arranged Outer tube；The feed inlet is arranged on the top of V-type housing；The air inlet is arranged on the side of V-type housing；The discharging Mouth is arranged on the lower section of V-type housing；The air outlet is arranged on the lower side of overcoat housing；The air inlet is provided with water conservancy diversion Device, the guiding device include fixing axle, the guide vane being arranged in fixing axle, fixing bolt, removable cover, direction tune Pole and steering yoke fixing bolt；The installation window to match with removable cover is provided with the V-type housing side；The activity Cover board is fixed in installation window by adjusting bolt；One end of the fixing axle is installed on V-type housing by fixing bolt, The other end is installed on removable cover by fixing bolt；One end of the direction adjusting rod is installed on removable cover with fixing axle On end connection；The other end is installed on V-type housing by steering yoke fixing bolt；The feed inlet is provided with dispersing device, The dispersing device includes the bearing block being arranged on V-type housing, the bearing being connected with bearing block, the rotation being arranged on bearing Axis, the bearing block are connected by belt pulley, belt and power set；The power set are arranged on outside cylinder；The rotation Tup is provided with axis；The tup is staggered on the rotating shaft.

7. sludge treating system according to claim 1, it is characterised in that the hot-blast outlet and cement kiln of the cement kiln Hot-blast outlet, the hot-blast outlet of kiln tail afterheat generating system of tail smoke-box bypass communicate.