CN103739184B - Method for drying and direct blending combustion of domestic sludge by using dry-process cement kiln waste heat - Google Patents

Abstract

The invention discloses a method for drying domestic sludge by utilizing waste heat of a dry process cement kiln and directly blending and burning it. Municipal sludge is first mixed with additives formed by sodium hydroxide, glycerol, diglycolamine, sodium alkylbenzene sulfonate and water, and then metered into coal powder and slaked lime, the dry sludge introduced into the drying rotary kiln Drying of residual air from the kiln head of French cement kilns or flue gas after power generation boilers. The dried sludge mixture is directly injected into the ascending flue between the kiln tail of the dry process cement kiln and the calciner through the high-pressure air interval of the air pump, and mixed with the cement raw materials in the kiln for blending and burning. The invention can not only effectively control the odor emission in the co-processing of urban domestic sludge in the dry process cement kiln, and significantly improve the working environment, but also the dry sludge mixture can be directly put into the tail of the dry process cement kiln for blending and firing Cement clinker has little influence on parameters such as the production process temperature of the dry process cement kiln, does not affect the quality of cement, achieves the utilization of the waste heat of the dry process cement kiln and the heat of the organic matter of the sludge, and realizes the safe co-processing of the domestic sludge. environmental and economic effects.

Description

The method of drying domestic sludge by using waste heat of dry process cement kiln and directly blending and burning it

technical field

The invention relates to a method for drying urban domestic sludge by using the waste heat of a dry-process cement kiln so that it can be mixed and fired directly into the kiln for treatment, especially a method for drying the flue gas after the power generation boiler by using the waste heat of the dry-process cement kiln production line and the residual air of the kiln head Municipal domestic sludge is directly put into the kiln for blending and burning treatment.

Background technique

With the continuous development of my country's economy, the capacity of urban sewage treatment has increased rapidly, and the amount of sludge generated has increased sharply. At the end of the Eleventh Five-Year Plan, the annual national wet sludge production reached a maximum of 28.5 million tons. Taking Guangxi as an example, the urban sewage treatment capacity has shown a rapid growth trend. At the end of 2010, the annual sludge output of sewage treatment plants in the whole district reached 1.15 million tons per year. At present, the main disposal methods of sludge in my country are direct landfill or agricultural utilization after dehydration (of which agricultural utilization accounts for about 44.8%, and landfill accounts for about 31%). Since the sludge produced by the sewage treatment plant contains a large amount of refractory organic matter, germs and a small amount of heavy metals (copper, nickel, zinc, cadmium, chromium, lead, arsenic, mercury, etc.) and complex inorganic components, landfill, Disposal methods such as composting not only occupy land resources and cause serious harm to human health, but also cause secondary pollution such as odor, greenhouse gas emissions, and soil heavy metal pollution. Due to the rapid development of my country's industrial economy, a large amount of sludge from sewage treatment plants is produced. The existing disposal methods occupy a large amount of cultivated land and cause heavy metal pollution. The severe situation has become an increasingly prominent social contradiction and environmental protection problem in our country today.

Internationally, some developed countries such as Europe and Japan banned industrial and domestic sludge landfills as early as 2005, and the sludge produced by sewage treatment plants (stations) is mainly treated by sludge thermal drying and incineration. Sludge thermal drying and incineration technology has been widely promoted in western industrialized countries and has become the main method of sludge treatment. At present, the direction of sludge treatment and disposal in all countries in the world is to take the development path of harmlessness, reduction and resource utilization. On February 18, 2009, my country also promulgated the "Technical Policy for Sludge Treatment and Disposal and Pollution Prevention of Urban Sewage Treatment Plants (Trial)", encouraging the use of dry incineration methods to improve the thermal energy utilization efficiency of sludge, harmless, and reduce And resource utilization will become the main direction of sludge treatment and disposal in my country. In recent years, my country has begun to introduce foreign mature sludge drying and incineration technology and equipment in Shanghai and other places to establish demonstration projects, but the cost of this equipment is high (the cost of a complete set of equipment for processing 350 tons of wet sludge per day reaches about 80 million yuan ) and high operating costs (about 350 yuan per ton of wet sludge treatment), it is difficult to promote it on a large scale in my country and especially in Guangxi at the current stage of economic capacity. At this stage, my country is still in the research and development stage of digesting and absorbing foreign advanced sludge direct drying and incineration technology, and developing sludge reduction technology suitable for my country's national conditions. It still needs to solve the problems of large equipment investment and high operating cost, and it is impossible to process polymeric sulfuric acid. Sludge produced by inorganic flocculants such as iron. The mixed incineration technology of waste incineration plants, thermal power plants, etc. and other materials has obtained certain application experience in China. However, since waste incineration plants and thermal power plants have power generation requirements, it is difficult to receive a large amount of sludge with low calorific value in actual operation, which cannot meet the increasing sludge treatment capacity requirements of sewage treatment plants.

In addition to organic substances, sludge from sewage treatment plants often also contains inorganic substances. These inorganic substances mainly contain SiO ₂ , A1 ₂ O ₃ , Fe ₂ O ₃ , CaO, MgO and other components, which are similar to the components of many building materials (such as Table one). The co-firing of dried sludge and cement raw materials can not only utilize the calorific value of organic matter in sludge (such as Table 2), but also be used as raw materials for cement production. At the same time, heavy metals contained in sludge are absorbed by clinker, so as to achieve no harm, reduction, and resource utilization, and the ecological effect is good. Therefore, the state encourages the use of cement kilns to blend and burn sewage treatment plant sludge, etc., to find new ways for sludge disposal, so as to overcome the high energy consumption shortcomings of sludge drying and incineration technology alone. For example, there are more than 240 large and small cement factories in Guangxi. After the end of the "Eleventh Five-Year Plan", the total cement production capacity in the region has reached 8,780 tons per year, and the proportion of new dry process cement accounts for 81%. There is a new dry-process cement production line with an annual output of more than 1 million tons, which creates favorable conditions for the use of mixed incineration with cement raw materials to treat sludge from urban sewage treatment plants in Guangxi District. Therefore, using cement kiln to dry and co-fire sewage treatment plant sludge reduction technology and equipment will be a new way of domestic sludge treatment and disposal in some areas of our country.

Table 1. Content of inorganic compounds in sludge ash (wt%)

Sludge origin SiO ₂ Al ₂ O _{3 Fe2O3 _} Na ₂ O K ₂ O MgO CaO Liuzhou 52.28 17.44 10.83 0.34 2.29 1.79 4.36 Guilin 43.35 19.45 11.34 0.51 2.49 2.26 4.85 (cement raw material) clay 66.32 15.86 5.08 <1.50 <2.50 1.40 1.09 (cement raw material) coal ash 53.84 30.42 5.16 - - 1.30 4.52

Table 2. Water content and combustion calorific value characteristics of sludge

Sludge origin Moisture content (wt%) Combustion heat of dried sludge (kJ/kg) Guilin 87.37 3071 Liuzhou 80.16 2723

The kiln head cooling residual air of the drying rotary kiln cement production line and the flue gas at the outlet of the kiln tail preheater C1 separator still contain a lot of heat. Take the drying rotary kiln production line with clinker production capacity of about 210T/h (210 tons/hour) of Xing'an Conch and Fusui Conch in Guangxi as an example. The residual air temperature at the kiln head is about 360-400°C. The residual air entering the power generation boiler is about 180,000-200,000 m ³ /h, while the temperature of the flue gas exiting the C1 separator is about 340-350°C, and the flow rate of the flue gas is about 220,000-260,000 m ³ /h. The flue gas temperature after the above-mentioned flue gas passes through the power generation boiler is still as high as 210°C, which is an ideal heat source that can be reused to dry urban domestic sludge, which can save energy costs.

Municipal domestic sludge contains a part of organic matter that is perishable and decomposed. Under suitable conditions, it will decompose and release a strong unpleasant smell and toxic and harmful gases. Therefore, the sludge drying process will produce high concentrations of malodorous gases, such as hydrogen sulfide, mercaptan and methyl mercaptan, which are the main control indicators for sludge deodorization. In particular, mercaptan and methyl mercaptan are highly adhesive, and when adsorbed on clothes such as fabrics, they produce unspeakable stench. Therefore, in the existing methods for drying municipal domestic sludge with waste heat, no matter the method of indirect drying or direct drying is adopted, a large amount of the above-mentioned malodorous gases will inevitably be produced, which will directly and cause pollution in the production area due to equipment leakage. Environmental degradation. If the dry tail gas containing a large amount of malodorous gas is put into the kiln for incineration, the water vapor must be separated, which will cause a significant increase in sludge disposal costs and equipment investment, and a large amount of separated tail gas will cause cement kiln working conditions. Severe fluctuations; if the dry tail gas containing a large amount of malodorous gas is introduced into the discharge system of the cement kiln, it is necessary to increase the absorption solvent and the absorption tower, and the absorbed hydrogen sulfide, mercaptan and methyl mercaptan face the problem of secondary pollution and treatment . This is also one of the predicaments that cement producers are reluctant to actively participate in the use of cement kilns to dry and burn sludge from sewage treatment plants. Therefore, it is necessary to innovate and develop a new method of co-drying and co-firing the drying rotary kiln cement production line to dispose of municipal domestic sludge.

Contents of the invention

The purpose of the present invention is to provide a kind of dry urban domestic sludge utilizing the waste heat of dry process cement kiln. It is a treatment method in which the melted mixture is directly put into the kiln and mixed and fired to form cement components.

The specific steps are:

1) Mix the dewatered sludge from the sewage plant with coal powder, slaked lime and additives evenly to form a granular sludge mixture of uneven size; during the mixing process, the slaked lime absorbs the water in the sludge to hydrate, and the additives absorb and inhibit the sludge The smelly gas in the mud emits; the quality of the coal powder, slaked lime and additives are respectively 10-12%, 8-15% and 1-3% of the dewatered sludge quality; the additives are sodium hydroxide, glycerine Alcohol, diglycolamine, sodium alkylbenzene sulfonate and water are mixed to form an emulsified mixed solution. The mass percentage of each component in the mixed solution is: sodium hydroxide 12-15%, glycerol 8-10%, di Glycolamine 15-25%, sodium alkylbenzene sulfonate 4-6% and water 44-61%.

2) The residual air from the kiln head of the dry process cement kiln (temperature is 360-400°C) or the flue gas after the power generation boiler (temperature is about 210°C) is input to the rotary drying kiln through the induced draft fan and the cyclone pipe, that is, the drying and rotating inside the kiln.

3) There is a sludge inlet on the inlet air pipe of the drying rotary kiln, and the sludge mixture obtained in step 1) is mechanically transported to the sludge inlet and falls into the air pipe, and the sludge mixture is blown by the cyclone force in the air pipe. Bring it into the drying rotary kiln; the sludge mixture absorbs the heat of flue gas or residual air in the drying rotary kiln and dries for 40-60 minutes, so that the water content of the dried sludge mixture is less than 10%; during the drying process, The malodorous gas components of hydrogen sulfide, mercaptan and methyl mercaptan react with slaked lime to generate sulfide, alkoxide, etc., and are absorbed by additives, so that the malodorous gas components are solidified into solid-phase dry granular materials (that is, dried sludge mixture) middle.

Among them: (1) The feed amount of the sludge mixture is: 2.0-2.5T/h;

(2) The flow rate of flue gas (temperature about 210°C) introduced after the power generation boiler is: 180,000-220,000 m ³ /h, or the flow rate of residual air at the kiln head (temperature is about 360-400°C): 100,000-120,000 m ³ /h;

4) The water-containing flue gas discharged from the drying rotary kiln is introduced into the original flue gas treatment system of the cement plant for treatment.

5) Step 3) The solid-phase dry granular material (that is, the dry sludge mixture) obtained by drying the rotary kiln is ball milled and then enters the feeding bin, and is driven into the tail of the dry-process cement kiln at intervals by the high-pressure air of the air pump and decomposed In the ascending flue between furnaces, after burning and decomposing, it is mixed with raw materials in the kiln and fired into cement clinker. The amount of mixing is not more than 10% of the clinker production capacity of the cement kiln; the high-pressure air injected by the air pump is supplemented to provide part of the sludge combustion. The required oxygen makes the sludge decompose and burn more completely; during the co-firing process, the organic matter and coal powder contained in the dried sludge mixture provide calorific value to supplement the heat required for the co-combustion of the sludge, which makes the measurement process parameters of the cement production system fluctuate Minimum, the temperature parameters of the production process do not exceed the allowable fluctuation range of ±50°C; the inorganic components contained in the sludge and the calcareous inorganic components solidified in the dried sludge mixture enter into the cement composition to become cement clinker The calcium oxide metered in makes the sludge mixture mature under the process conditions close to the clinker melting stoichiometric ratio, and quickly mixes and melts with the raw materials of the production line itself, avoiding the uneven curing of the sludge components in the high-temperature curing stage; The solidified odorous gas components in the dried sludge mixture are decomposed into SO ₂ by the high temperature above 1000°C in the ascending flue, and the carbon-containing organic components are decomposed into CO ₂ by high temperature combustion, and the flue gas enters the front section of the calciner with the rising flue gas of the calciner The cement production system is discharged after being treated by the tail gas treatment system of the cement production line.

The invention not only utilizes the waste heat of the dry process cement kiln, the calorific value and residual components of domestic sludge, but also reduces the discharge of malodorous gas during the drying and blending of domestic sludge, improves the production and operation environment, and does not affect cement production Workmanship and cement quality.

Description of drawings

Fig. 1 is the preparation flowchart of additive of the present invention.

Fig. 2 is a flow chart of the method for drying municipal domestic sludge by using the waste heat of a dry process cement kiln and directly blending and burning it.

Detailed ways

The present invention will be described in detail below through specific examples, but it should be understood that the present invention is not limited to the examples.

Example:

Implementation equipment 1: 230T/h dry process cement production line with raw material feed.

Implementation equipment 2: Rotary drying kiln, the inner cavity has a diameter of about 0.8 meters and a length of about 18 meters, and the walls of the inner cavity are staggered with folding planks about 20 cm long.

The source of domestic sludge: a municipal dewatered activated sludge, with a moisture content of about 80.05%, a content of combustible matter (organic matter) of about 13.95%, a calorific value of dried sludge of about 6000 kJ/kg (kcal), and a content of residual inorganic matter About 6.0% (including SiO ₂ 52.28%, Al ₂ O ₃ 17.44%, Fe ₂ O ₃ 10.83%, Na ₂ O 0.34%, K ₂ O 2.29%, MgO 1.79%, CaO 4.36%, etc.).

(1) After weighing sodium hydroxide, glycerol, diglycolamine, sodium alkylbenzene sulfonate and water according to mass percentages of 15%, 10%, 20%, 5% and 50% respectively, the hydrogen Dissolve and mix sodium oxide and water, then add glycerol, diglycolamine and sodium alkylbenzene sulfonate in sequence, stir and mix evenly to form an emulsified mixed solution, which is the additive mixed solution, and the mixture can be stored stably for more than one month.

(2) Put 10 tons of dewatered activated sludge from the sewage plant into the mixing bin, add 0.3 tons of the additive mixture obtained in step 1) while stirring, and then add 1 ton of finely ground coal powder and 0.8 tons of slaked lime8 %Continue to mix evenly; the mixed sludge mixture is in the shape of solid phase particles with uneven size.

(3) The flue gas discharged from the power generation boiler of the cement production line with a temperature of 210°C is input into the drying rotary kiln through a separately installed induced draft fan and cyclone air pipe without passing through the economizer, and the flue gas introduced is about 220,000 m ³ /h.

The operating parameters of the drying rotary kiln are maintained at a kiln operating speed of 1.5-2.0 rpm, and the furnace body is preheated for 3 hours. The pre-mixed sludge mixture obtained in step 2) is input to the hopper on the air duct at the inlet of the drying rotary kiln with a belt conveyor, and falls into the air duct, and the sludge mixture is blown into the Rotary drying is carried out in the drying rotary kiln; the feed rate of the sludge mixture is controlled at 2.4 T/h, and the drying time is adjusted and controlled by controlling the kiln operating speed, so that the drying time of the sludge mixture in the drying rotary kiln will not vary. Less than 60 minutes; when the drying rotary kiln operating speed is 1.5 rpm, the water content of the dried sludge mixture is measured to be 8.89%.

(4) The dried sludge mixture falling from the outlet of the drying rotary kiln is transferred to the ball mill for 1 hour of grinding and crushing, and the steam-containing flue gas discharged from the tail of the drying rotary kiln is introduced into the flue gas treatment system of the cement plant for treatment Then discharge; the crushed dry sludge mixture is hoisted to the operation platform at the calciner and the ascending flue of the new dry process cement production line and injected into the separately set feeding bin, and injected by the high-pressure air of the air pump at intervals The flue at the bottom of the decomposition furnace of the new dry process cement production line is fed into the kiln for mixed combustion; the air pump pumps the material every 20s, and the mixed material of the dried sludge is 3.2 kg each time.

Use the high-pressure air of the air pump to drive the dried sludge mixture into the flue at the bottom of the decomposition furnace of the new dry process cement production line at intervals and enter the kiln for blending. It can be quickly dispersed, and at the same time, the high-pressure air pressed by the air pump can supplement and provide the oxygen needed for part of the sludge combustion, so that the sludge can be decomposed and burned more completely. In addition, the more important reason is that feeding at intervals can make the production process parameters of cement kiln stable and balanced quickly, with less fluctuation. Since the organic matter in the dried sludge mixture itself has a large amount of calorific value, the added coal can further provide enough heat through calculation, so that the temperature parameters of the cement kiln production process will not exceed the allowable fluctuation range. In this example, after the sludge is blended into the kiln, the temperature in the calcining rotary kiln of the new dry process cement production line only drops by 10°C. At the same time, the calcium oxide metered in can make the sludge mixture mature under the process conditions close to the stoichiometric ratio of clinker melting, and can be quickly mixed and melted with the raw materials of the production line itself, which avoids the insufficiency of the sludge components in the high-temperature curing stage. uniform.

In the process of the embodiment, after adding coal powder, slaked lime and additives in the process of domestic sludge drying and co-combustion, the emission intensity of the odor is reduced from above level 2 to below level 1, and the odor intensity at the operating point is reduced from level 5 to Class 1, with obvious odor removal effect. Moreover, after the dried sludge is blended into the kiln and fired, the cement setting time, strength and properties not only do not decrease, but are enhanced. Through the examples, it is illustrated that this method can effectively control the sludge odor emission during the disposal process while using the waste heat in the cement production process to dry the sludge, which significantly improves the working environment, and the dried sludge mixture can be put into the kiln Blending and burning cement clinker can achieve the utilization of waste heat in the cement production process and the co-processing of sludge, which shows the feasibility and innovation of this method.

The result is as follows:

(1) Odor emission:

During the drying process, when the domestic sludge enters the drying rotary kiln alone without adding other materials, after 2 hours of drying, you can feel an obvious foul smell about 2 kilometers away from the factory area of the test site, but there is no nausea . However, within 50 meters near the test point, the operators are significantly susceptible, especially some operators at the feeding place, feel sick. After the working clothes worn by the workers were changed, the odor could still be smelled on the clothes the next day. After normal addition of coal powder, slaked lime and additives, the stench can no longer be smelled about 2 kilometers away from the factory area of the test point, and within 50 meters near the test point, the workers have a slight sense of smell. At the feeding place, the operator is still susceptible to the odor, but there is no nausea. After the working clothes worn by the workers were changed, there was no smell on the clothes the next day. Therefore, after adding coal powder, slaked lime and additives in the process of domestic sludge drying and co-combustion, the emission intensity of odor will be reduced from level 2 to below level 1, and the odor intensity at the operating point will be reduced from level 5 to level 1. Has obvious odor removal effect.

The odor concentration collected and tested within 10 meters of the production operation area is: the concentration of H ₂ S is less than 0.015mg/m ³ , and the concentration of methyl mercaptan is less than 0.0055mg/m ³ , basically reaching the first-level factory boundary standard. The chimney exhaust of the cement plant was collected and tested, and H ₂ S and methyl mercaptan have not been detected, which may have been absorbed by the dust removal tower of the cement plant even though the exhausted flue gas after drying contains a small amount of odor. In addition, during the test, the concentration of SO ₂ in the chimney exhaust gas of the cement plant was 10 mg/m ³ before and after the test, indicating that the mixed combustion of sludge into the kiln has little effect on the monitoring of SO ₂ emissions, and the SO ₂ emissions of the cement production line are still 50 mg/m ³ below the national special emission limit.

(2) Comparison of cement quality:

By comparing the change of the cement quality before and after the dry sludge mixture is blended into the kiln, it can be obtained from the results of the cement quality in Table 3, Table 4 and Table 5. The performance of cement setting time, strength and properties not only did not decrease, but was enhanced, showing the feasibility of this method.

Table 3 Comparison of cement setting time after sludge blending

experimental nature Initial setting/min Final setting/min C ₃ S/% C ₂ S/% normal production 142 196 42.57 29.63 Sludge burning 137 183 45.78 25.98 GB175-2007 ≥45 ≤390 50%～70% 18%～30%

Table 4 Comparison of cement strength after sludge blending

experimental nature 3d bending resistance/MPa 3d compression/MPa 28d bending resistance/MPa 28d compression/MPa normal production 2.5 10.5 6.0 32.5 Sludge burning 2.7 10.4 6.3 34.4 GB175-2007 ≥2.5 ≥10 ≥5.5 ≥32.5

Table 5 Comparison of cement properties after sludge blending

experimental nature Loss on ignition/% MgO/% Alkali content/% SO ₃ /% Fineness/% Specific table/(m ² /kg) normal production 0.37 1.69 0.24 0.13 2.7 359 Sludge burning 0.31 1.94 0.32 0.17 2.5 365 GB175-2007 ≤5.0 ≤5.0 ≤0.6 ≤3.5 ≤10 ≥300

Claims (1)

1. utilize dry-process cement rotary kiln waste heat mummification domestic sludge and directly mix and burn a method of processing, it is characterized in that concrete steps are:

1) dewatered sludge of Sewage Plant is mixed with coal dust, white lime and additive, be size inhomogeneous granular be mud mixture; In mixing process, white lime absorbs the moisture content aquation in mud, and additive absorbs and suppresses odorous gas in mud and comes out; The quality of described coal dust, white lime and additive is respectively 10-12%, 8-15% and the 1-3% of dewatered sludge quality; Described additive is the emulsification mixed solution that sodium hydroxide, glycerol, diglycolamine, sodium alkyl benzene sulfonate and water are mixed to form, and in mixed solution, the mass percent of each component is: sodium hydroxide 12-15%, glycerol 8-10%, diglycolamine 15-25%, sodium alkyl benzene sulfonate 4-6% and water 44-61%;

2) by temperature, be that the dry-process cement rotary kiln kiln hood lingering remnants of past customs or the temperature of 360-400 ℃ is 210 ℃ of flue gases after electricity generation boiler, by induced draft fan and tornadotron, being input to rotary type mummification kiln is in drying rotary kiln;

3) on the entrance airduct of drying rotary kiln, be equipped with mud entrance, step 1) gained mud mixture mechanical transport is fallen in airduct to mud ingress, by means of the cyclonic wind in airduct, mud mixture is blown and brought in drying rotary kiln; Mud mixture absorbs the heat mummification 40-60 minute of flue gas or the lingering remnants of past customs in drying rotary kiln, makes the mud mixture water content after mummification be less than 10%; In drying process, hydrogen sulfide, mercaptan and thiomethyl alcohol foul gas component are reacted with white lime and are generated sulphide salt, alkoxide, and are added agent absorption, and making foul gas component be cured to solid phase mummification granule materials is in dewatered sludge mixture;

Wherein: (1) described mud mixture inlet amount is: 2.0-2.5t/h;

(2) described temperature is that the flue gas flow after the electricity generation boiler of 210 ℃ is: 18-22 ten thousand m ³/ h; Described temperature is that 360-400 ℃ of kiln hood lingering remnants of past customs flow is: 10-12 ten thousand m ³/ h;

4) humid flue gas that drying rotary kiln is discharged is introduced the original smoke processing system in cement mill and is processed;

5) step 3) drying rotary kiln gained dewatered sludge mixture enters feeding chamber after ball mill pulverizing, with the high pressure gas interval of pneumatic pump, squeeze in the funnel uptake between dry-process cement rotary kiln kiln tail and decomposing furnace, after combustion decomposition, mix and mix calcination of cement clinker with raw material in kiln, incorporation is not more than 10% of cement kiln clinker throughput; The oxygen that provides part sludge incineration to need is provided the high-pressure air that pneumatic pump is pressed into, and makes sludge disintegration burning more complete; Mix in burning process, in dewatered sludge mixture, contained organic matter and coal dust provide calorific value to supplement mud to mix and burn required heat, make cement production system metering process parameter fluctuation minimum, production technique temperature parameter do not exceed permission ± 50 ℃ of fluctuation ranges; In mud, in contained inorganics component and dewatered sludge mixture, solidifying contained calcareous inorganic component enters into cement composition and becomes cement clinker, the calcium oxide being metered into makes this slaking under the processing condition that approach grog fusing stoichiometric of mud mixture, avoided sludge components irregular in the slaking in high-temperature maturing stage rapidly and the raw material slaking mixed melting of production line itself; And solidify contained foul gas component in dewatered sludge mixture, by 1000 ℃ of above pyrolytic decompositions in funnel uptake, become SO ₂, carbonaceous organic material composition is resolved into CO by high-temp combustion ₂, with decomposing furnace rising flue gas, enter after decomposing furnace leading portion cement production system is processed by cement producing line exhaust treatment system and discharge.