CN102583945A - Sludge multi-stage drying device, fluidized bed combustion treatment device and fluidized bed combustion treatment method - Google Patents

Abstract

A sludge multistage dryer, a fluidized bed incineration treatment device and a method belong to the field of sludge treatment. The present invention aims to solve the problems of complex structure and large occupied area of the sludge dryer, as well as the problems of the heat cannot be self-balanced and the operating cost of the sludge incineration technology is high. Desiccator: At least three stages of augers are installed in the drying chamber, and the motor is installed on the drying chamber. The motor establishes a transmission relationship with the augers of all levels through gears. Treatment device and method: There is a dry sludge storage bin under the dry sludge outlet of the dryer, and the steam outlet is connected to the cyclone separator. Most of the steam is heated by the heat exchanger and returns to the drying device to continue drying the wet sludge. Part of the steam is sprayed and dehydrated by the spray tower, and the sewage generated is sent to the sewage treatment plant for treatment. The non-condensable gas is sent to the fluidized bed incinerator for combustion, and the air required for sludge incineration passes through the heat exchanger under the action of the blower and then passes The air preheater is sent into the fluidized bed incinerator to participate in combustion. The invention is used in sludge treatment.

Description

Sludge multistage dryer, fluidized bed incineration treatment device and method

technical field

The invention relates to a sludge pollution-free treatment technology, in particular to a sludge multi-stage dryer, a fluidized bed incineration treatment device and a method.

Background technique

Sludge is the solid settling material produced by water and wastewater treatment processes. It generally contains a large amount of organic matter, heavy metals, pathogenic bacteria, etc., and is accompanied by a foul smell. my country discharges a large amount of industrial and urban domestic sewage every year. With the rapid development of economy, the increase of population and the continuous improvement of urbanization, the discharge of sewage will continue to increase. The annual dry sludge produced by China's urban sewage treatment plants is about 25×10 ⁴ t, and the wet sludge is about 450-550×10 ⁴ t, and the annual growth rate is about 15%. Sludge contains a large amount of organic matter and rich nitrogen, phosphorus and other nutrients, resulting in eutrophication of water quality and deterioration of water quality. At the same time, heavy metals, toxic substances, pathogenic bacteria, etc. Great harm. If the sludge is discharged and stacked randomly without proper treatment, it will cause serious pollution to the surrounding environment, so that the established sewage plants cannot fully play their role in eliminating environmental pollution. Therefore, the sludge must be treated. Sludge treatment is of great significance for the rational use of resources and the reduction of environmental pollution.

At present, sludge disposal methods include landfill, agricultural use, and incineration. Sludge incineration has the obvious advantages of reduction, harmlessness, and resource utilization. During the incineration process, all germs are killed, the stability of heavy metals is improved, and toxic organic matter is oxidized and decomposed. The volume of residual ash of sludge after incineration is much smaller than that of sludge after mechanical dehydration. At present, sludge incineration has been widely used all over the world, and the proportion of sludge incineration will be further increased in the future. Since the moisture content of the sludge after mechanical dehydration is still about 78% to 82%, its calorific value is low, and it cannot be stably burned alone, so it should be dried.

There are various problems in the existing sludge drying technology. For example, although the utility model patent composite heating disc sludge dryer (patent No. 200920062589.2) applied by South China University of Technology can effectively dry the sludge, it produces a large amount of waste gas , pollute the environment, and require an external heat source to provide energy. Yu Botao's utility model patent rotary kiln thermal drying device for sludge (patent number 201020617754.9) adopts a heat conduction single-stage drying method, but the rotary kiln body is too long and the floor area is too large. Generally, the sludge moisture can only be reduced to about 40% and so on. The sludge incineration patent applied by the Institute of Engineering Thermophysics of the Chinese Academy of Sciences (application number 200510077292.X, application number 200820123330.X) uses a circulating fluidized bed high-temperature ash and a heat transfer oil heat exchange device to dry the wet sludge. The system is complex and the power The consumption is large, and due to the low calorific value of the sludge, the heat balance cannot be achieved. The operation results show that the treatment cost of a ton of wet sludge (with a moisture content of 80%) using oil as an auxiliary fuel reaches 400 yuan, which is not economical. The patent name is "Sludge Incineration Treatment Method and Sludge Incineration Treatment System" and the patent number is 200510038416.3. The wet sludge is directly sent to the circulating fluidized bed for incineration, which requires a large amount of auxiliary fuel and the operating cost is too high. The patent number of "integrated treatment process of wet sludge circulating fluidized bed harmless incineration" applied by China North China Design and Research Institute of Municipal Engineering is 200710060213.3 The circulating fluidized bed high temperature ash and wet sludge are granulated in the dryer, and then sent Combustion in a circulating bed has problems such as complex structure, self-balancing heat, and high operating costs.

Contents of the invention

The purpose of the present invention is to solve the problems of complex structure and large occupied area in the existing sludge dryer, as well as the problems of the heat in the sludge incineration technology that cannot be self-balanced and the operation cost is high, and then provide a sludge dryer Multistage dryer, fluidized bed incineration treatment device and method.

The first technical solution of the present invention is: the sludge multi-stage dryer includes a drying chamber, a motor, a plurality of gears, at least three stages of augers and an auger chassis with the same number of stages as the auger;

The at least three levels of augers are installed horizontally in the drying chamber from top to bottom, adjacent augers on the same floor are arranged alternately, an auger chassis is arranged below each level of augers, and the motor is installed on the outer wall of the drying chamber. The transmission relationship is established through gears and augers at all levels. The upper cover of the drying chamber is provided with a wet sludge inlet, the upper part of the side wall of the drying chamber is provided with a steam inlet, and the bottom plate of the drying chamber is provided with a dry sludge outlet. The lower part of the side wall is provided with a steam outlet.

Each level of auger includes a double auger.

Each level of auger includes a pair of augers, named as double augers, the pair of augers are arranged side by side in the horizontal direction, and the transmission relationship is established between the two augers. The auger is named as the drying section auger, and a support is arranged between the two drying section augers.

Each level of auger includes a plurality of double augers, and the plurality of double augers are arranged side by side in the horizontal direction, and a transmission relationship is established between two adjacent double augers. The auger is named as the drying section auger, and a support is arranged between two adjacent drying section augers.

The sludge multi-stage dryer includes six-stage auger, seven-stage auger or nine-stage auger. When the moisture content of the sludge is 50% to 60%, drying with six or seven-stage augers can reduce the moisture content of the sludge to less than 10%, and the calorific value of the dried sludge can reach more than 2000Kcal/kg, realizing self-energy balance. When the moisture content of the sludge is 80%, the nine-stage auger is used for drying, and the calorific value of the dried sludge reaches more than 3500Kcal/kg, realizing energy self-balancing.

The sludge multi-stage dryer includes three to six stages of augers. When the moisture content of the sludge is 50% to 60%, use three to six-stage augers for drying. After drying, the moisture content of the sludge is controlled between 10% and 40%, and the calorific value of the dried sludge is greater than 2000Kcal/kg. Less than 3500Kcal/kg to achieve energy balance.

The second technical solution of the present invention is: the sludge fluidized bed incineration treatment device includes a fluidized bed sludge incinerator, a primary air preheater, a first heat exchanger, a secondary air preheater, and a multistage sludge dryer. dehumidifier, dry sludge storage bin, cyclone separator, circulating fan, first blower, second heat exchanger, spray tower, second blower, humidifier, steam outlet pipe, sludge outflow pipe, dust Delivery pipe, sludge pipe, first steam flow pipe, second steam flow pipe, steam inlet pipe, third steam flow pipe, non-condensable gas delivery pipe, sewage outflow pipe, air flow pipe, primary preheating air pipe , secondary preheating air pipe and high temperature flue gas pipe;

The steam outlet is connected to the upper part of the cyclone separator through the steam outlet pipe, the dry sludge outlet is connected to the dry sludge storage bin through the sludge outflow pipe, and the bottom of the cyclone separator is connected to the dry sludge storage bin through the dust conveying pipe , the dry sludge storage bin is connected with the fluidized bed sludge incinerator through the sludge pipeline, the top of the cyclone separator is connected with the second heat exchanger through the first steam flow pipe, and the circulation fan is installed on the first steam flow pipe , the circulation fan communicates with the first heat exchanger through the second steam flow pipe, the first heat exchanger communicates with the steam inlet through the steam inlet pipe, the humidifier is installed on the steam inlet pipe, and the bottom of the second heat exchanger The first blower is installed, the second heat exchanger communicates with the spray tower through the third steam flow pipe, the spray tower communicates with the fluidized bed sludge incinerator through the non-condensable gas delivery pipe, and the second blower is installed on the non-condensable gas On the delivery pipe, the sewage outflow pipe is installed on the spray tower, the second heat exchanger communicates with the primary air preheater through the air flow pipe, and the primary air preheater communicates with the secondary air preheater through the primary preheating air pipe. The heater is connected, the secondary air preheater is connected with the fluidized bed sludge incinerator through the secondary preheating air pipe, the high temperature flue gas pipeline is installed at the flue gas outlet end of the fluidized bed sludge incinerator, the first heat exchange The air heater, the secondary air preheater and the primary air preheater are connected in series on the high temperature flue gas pipeline from left to right.

The sludge multistage dryer in this technical solution adopts the sludge multistage dryer described in Technical Solution 1.

The third technical solution of the present invention is: sludge fluidized bed incineration treatment method: when the heat value of the dry sludge is 2000Kcal/kg, the wet sludge is mechanically dehydrated and press-filtered until the moisture content is 50% to 60%. The wet sludge inlet enters the drying chamber, and at the same time, superheated steam at 250°C to 450°C enters the drying chamber through the steam inlet; the motor drives the augers at all levels to rotate through the gears, and the wet sludge is stirred from top to bottom by the double auger. The stage is in direct contact with the superheated steam for heat exchange, the moisture content of the sludge drops below 10%, and enters the dry sludge storage bin through the sludge outflow pipe, and the temperature of the superheated steam drops to 120°C-180°C, and enters the cyclone separation through the steam outlet pipe After the steam is separated by the cyclone separator, the dust enters the dry sludge storage bin through the dust conveying pipe, and the dust and dry sludge enter the fluidized bed sludge incinerator through the sludge pipeline for combustion, and the flue gas produced by combustion It is discharged through the high-temperature flue gas pipeline, and at the same time provides heat for the first heat exchanger, the second-level air preheater and the first-level air preheater on the high-temperature flue gas pipeline, and part of the steam separated by the cyclone separator is in the circulation fan. Under the action, it enters the first heat exchanger, and the steam exchanges heat with the first heat exchanger to raise the temperature to 250°C to 450°C. When the furnace is started, the humidifier sprays water mist and hot air to generate hot steam, and then enters the drying chamber through the steam inlet. , when the wet sludge is dried for 1.5h-2h, the humidifier is turned off, and the remaining steam separated by the cyclone separator enters the second heat exchanger to exchange heat with the air under the action of the circulating fan, and the air enters the second heat exchanger from the first blower. The second heat exchanger, the remaining steam whose temperature drops to 80°C enters the spray tower for spraying and dehydration, the generated sewage flows out through the sewage outflow pipe, and the non-condensable gas in the spray tower flows back to the fluidized bed through the non-condensable gas delivery pipe The sludge incinerator burns out, and the air required for sludge incineration is sent to the fluidized bed sludge incineration through the second heat exchanger under the action of the first blower, and then through the first-stage air preheater and the second-stage air preheater. Participate in combustion in the furnace.

This technical proposal is completed by using a sludge fluidized bed incineration treatment device with six or seven stages of auger.

The fourth technical solution of the present invention is: sludge fluidized bed incineration treatment method: when the heat value of dry sludge is 3500Kcal/kg, wet sludge with a moisture content of 80% enters the drying chamber from the wet sludge inlet, and at the same time, 250 The superheated steam from ℃ to 450℃ enters the drying chamber through the steam inlet; the motor drives the augers at all levels to rotate through the gears, and the wet sludge is in direct contact with the superheated steam from top to bottom to exchange heat under the agitation of the twin augers. The moisture content drops below 10% and enters the dry sludge storage bin through the sludge outflow pipe, and the superheated steam temperature drops to 120°C-180°C and enters the cyclone separator through the steam outlet pipe. After the steam is separated by the cyclone separator, the dust It enters the dry sludge storage bin through the dust conveying pipe, and the dust and dry sludge enter the fluidized bed sludge incinerator through the sludge pipeline for combustion. The first heat exchanger, the second-stage air preheater and the first-stage air preheater on the air pipeline provide heat, and part of the steam separated by the cyclone separator enters the first heat exchanger under the action of the circulating fan, and the steam Exchange heat with the first heat exchanger and raise the temperature to 250°C to 450°C. When starting the furnace, the humidifier sprays water mist and hot air to generate hot steam and then enters the drying room through the steam inlet. After the wet sludge is dried for 1.5h-2h , turn off the humidifier, and the remaining steam separated by the cyclone separator enters the second heat exchanger to exchange heat with the air under the action of the circulating fan, and the air enters the second heat exchanger from the first blower, and the temperature drops to 80°C The remaining steam enters the spray tower for spraying and dehydration, and the generated sewage flows out through the sewage outflow pipe. Under the action of the first blower, the required air is sent to the fluidized bed sludge incinerator to participate in combustion through the second heat exchanger, the primary air preheater and the secondary air preheater.

This technical proposal is completed by using a sludge fluidized bed incineration treatment device with a nine-stage auger.

The fifth technical solution of the present invention is: sludge fluidized bed incineration treatment method: when the calorific value of dry sludge is less than 3500Kcal/kg and greater than 2000Kcal/kg, the wet sludge with a moisture content of 80% is first squeezed to The moisture content is 50% to 60%, and then enters the drying chamber from the wet sludge inlet. At the same time, superheated steam of 250°C to 450°C enters the drying chamber through the steam inlet; the motor drives the augers at all levels to rotate through the gears, and the wet sludge is Under the agitation of the double auger, it directly contacts with the superheated steam from top to bottom for heat exchange, and the moisture content of the sludge drops below 10%. It enters the dry sludge storage bin through the sludge outflow pipe, and the temperature of the superheated steam drops to 120°C. ~180°C enters the cyclone separator from the steam outlet pipe. After the steam is separated by the cyclone separator, the dust enters the dry sludge storage bin through the dust conveying pipe, and the dust and dry sludge enter the fluidized bed sludge through the sludge pipeline together. The mud incinerator is burned, and the flue gas generated by the combustion is discharged through the high-temperature flue gas pipeline, and at the same time provides heat for the first heat exchanger, the second-level air preheater and the first-level air preheater on the high-temperature flue gas pipeline, and is passed through the cyclone Part of the steam separated by the separator enters the first heat exchanger under the action of the circulating fan, and the steam exchanges heat with the first heat exchanger to raise the temperature to 250°C to 450°C. When the furnace is started, the humidifier sprays water mist and heat After the air generates hot steam, it enters the drying chamber through the steam inlet. When the wet sludge is dried for 1.5h-2h, the humidifier is turned off, and the remaining steam separated by the cyclone separator enters the second heat exchanger and Air heat exchange, the air enters the second heat exchanger from the first blower, and the remaining steam whose temperature drops to 80°C enters the spray tower for spraying and dehydration, and the generated sewage flows out through the sewage outflow pipe, and the non-condensable gas in the spray tower Return to the fluidized bed sludge incinerator through the non-condensable gas delivery pipe for combustion, and the air required for sludge incineration passes through the second heat exchanger under the action of the first blower, and then passes through the primary air preheater and secondary air The preheater is sent into the fluidized bed sludge incinerator to participate in combustion.

This technical proposal is completed by using a sludge fluidized bed incineration treatment device with three to six stages of auger.

Compared with the prior art, the present invention has the following beneficial effects: the sludge multi-stage dryer of the present invention adopts multi-stage auger to realize multi-stage drying, has a simple structure, occupies a small area, and the moisture content of the dry sludge reaches 10%. The following: The sludge fluidized bed incineration treatment device and method of the present invention uses superheated steam as the drying medium, which has the function of preventing sludge dust explosion, and at the same time, the specific volume of superheated steam is large, the heat exchange efficiency is high, and the energy of drying wet sludge Self-sufficiency by burning dry sludge realizes energy self-sufficiency, heat self-balance, and greatly reduces operating costs. In addition, the sludge fluidized bed incineration treatment device does not have a waste heat boiler, the overall device is simple, and the manufacturing cost is low; sludge fluidization The bed incineration treatment device uses a conventional fluidized bed sludge incinerator to incinerate sludge, with low power consumption.

Description of drawings

Fig. 1 is the overall structure diagram of the sludge multistage dryer of the present invention, Fig. 2 is the A-A sectional view of Fig. 1, Fig. 3 is the B-B sectional view of Fig. 1, Fig. 4 is the overall structure of the sludge fluidized bed incineration treatment device picture.

Detailed ways

Specific Embodiment 1: This embodiment is described with reference to FIGS. 1 to 3. The sludge multistage dryer of this embodiment includes a drying chamber 23, a motor 8, a plurality of gears 11, at least three stages of augers and auger stages Number the same auger chassis 9;

The at least three stages of augers are horizontally installed in the drying chamber 23 from top to bottom, adjacent augers on the same floor are arranged in a staggered manner, and an auger chassis 9 is arranged below each stage of auger 24, and the motor 8 is installed in the drying chamber On the outer wall of 23, the motor 8 establishes a transmission relationship with the augers at all levels through the gear 11. The upper cover of the drying chamber 23 is provided with a wet sludge inlet 13, and the upper part of the side wall of the drying chamber 23 is provided with a steam inlet 12. The drying chamber 23 A dry sludge outlet 6 is provided on the bottom plate of the drying chamber, and a steam outlet 5 is provided on the lower side wall of the drying chamber 23 .

Specific Embodiment 2: This embodiment is described with reference to FIG. 1 to FIG. 3 . Each level of auger in this embodiment includes a double auger 10 . Other compositions and connections are the same as in the first embodiment.

Specific embodiment three: this embodiment is described in conjunction with Fig. 1 to Fig. 3, and each level of auger of this embodiment comprises a pair of auger, named double auger 10, and described a pair of auger horizontal direction arranges side by side, two A transmission relationship is established between the augers through gears 11. The double auger 10 in the same row among at least three stages of augers is named as the drying section auger 25, and a support member 21 is arranged between the two drying section augers 25. With such a setting, the efficiency is high. Other compositions and connections are the same as in the first embodiment.

Specific embodiment four: this embodiment is described in conjunction with Fig. 1 to Fig. 3, and each level of auger of this embodiment comprises a pair of auger, named double auger 10, and described pair of auger horizontal direction arranges side by side, two The transmission relationship is established between the augers through gears 11. At least the double auger 10 in the same row in the three-stage auger is named as the drying section auger 25, and a support member 21 is arranged between two adjacent drying section augers 25. . With such a setting, the efficiency is high. Other compositions and connections are the same as in the first embodiment.

Embodiment 5: This embodiment is described with reference to FIG. 1 to FIG. 3 . The sludge multi-stage dryer in this embodiment includes a six-stage auger, a seven-stage auger or a nine-stage auger. When the moisture content of the sludge is 50% to 60%, drying with six or seven-stage augers can reduce the moisture content of the sludge to less than 10%, and the calorific value of the dried sludge can reach more than 2000Kcal/kg, realizing self-energy balance. When the moisture content of the sludge is 80%, the nine-stage auger is used for drying, and the calorific value of the dried sludge reaches more than 3500Kcal/kg, realizing energy self-balancing. Other compositions and connections are the same as those in Embodiment 1, 2, 3 or 4.

Specific Embodiment 6: This embodiment is described with reference to FIG. 1 to FIG. 3 . The sludge multi-stage dryer in this embodiment includes three to six stages of augers. When the moisture content of the sludge is 50% to 60%, use three to six-stage augers for drying. After drying, the moisture content of the sludge is controlled between 10% and 40%, and the calorific value of the dried sludge is greater than 2000Kcal/kg. Less than 3500Kcal/kg to achieve energy balance. Other compositions and connections are the same as those in Embodiment 1, 2, 3 or 4.

Embodiment 7: This embodiment is described in conjunction with FIG. 4. The sludge fluidized bed incineration treatment device of this embodiment includes a fluidized bed sludge incinerator 1, a primary air preheater 2, a first heat exchanger 3, Secondary air preheater 4, sludge multi-stage dryer 7, dry sludge storage bin 14, cyclone separator 15, circulation fan 16, first blower 17, second heat exchanger 18, spray tower 19 , second blower 20, humidifier 22, steam outlet pipe 26, sludge outflow pipe 27, dust delivery pipe 28, sludge pipe 29, first steam flow through pipe 30, second steam flow through pipe 31, steam inlet Pipe 32, third steam flow pipe 33, noncondensable gas delivery pipe 34, sewage outflow pipe 35, air flow pipe 36, primary preheating air pipe 37, secondary preheating air pipe 38 and high temperature flue gas pipe 39;

The steam outlet 5 communicates with the upper part of the cyclone separator 15 through the steam outlet pipe 26, the dry sludge outlet 6 communicates with the storage bin 14 through the sludge outflow pipe 27, and the bottom of the cyclone separator 15 communicates with the storage bin 14 through the dust transport The pipe 28 communicates, the storage bin 14 communicates with the fluidized bed sludge incinerator 1 through the sludge pipeline 29, the top of the cyclone separator 15 communicates with the second heat exchanger 18 through the first steam flow through the pipe 30, and the circulating fan 16 is installed On the first steam flow pipe 30, the circulating fan 16 communicates with the first heat exchanger 3 through the second steam flow pipe 31, the first heat exchanger 3 communicates with the steam inlet 12 through the steam inlet pipe 32, and the humidifier 22 Installed on the steam inlet pipe 32, the bottom of the second heat exchanger 18 is equipped with a first blower 17, and the second heat exchanger 18 communicates with the spray tower 19 through the third steam flow through the pipe 33, and the spray tower 19 passes through The condensed gas conveying pipe 34 communicates with the fluidized bed sludge incinerator 1, the second blower 20 is installed on the noncondensable gas conveying pipe 34, the sewage outflow pipe 35 is installed on the spray tower 19, and the second heat exchanger 18 passes the air The flow-through pipe 36 communicates with the primary air preheater 2, the primary air preheater 2 communicates with the secondary air preheater 4 through the primary preheating air pipe 37, and the secondary air preheater 4 passes through the secondary preheating The air pipe 38 communicates with the fluidized bed sludge incinerator 1, the high temperature flue gas pipeline 39 is installed at the flue gas outlet end of the fluidized bed sludge incinerator 1, the first heat exchanger 3, the secondary air preheater 4 and the The primary air preheater 2 is connected in series with the high temperature flue gas pipeline 39 from left to right.

The heat exchanger in this embodiment is made of anti-corrosion materials to avoid low temperature dew point corrosion.

The sludge multistage dryer 7 in this embodiment adopts any one of the sludge multistage dryers in Embodiments 1 to 6.

Embodiment 8: This embodiment is described in conjunction with FIG. 4. The sludge fluidized bed incineration treatment method of this embodiment: when the heat value of the dry sludge is 2000Kcal/kg, the wet sludge is mechanically dehydrated and press-filtered to contain water After the rate is 50% to 60%, the wet sludge inlet 13 enters the drying chamber 23, and at the same time, superheated steam of 250°C to 450°C enters the drying chamber 23 through the steam inlet 12; the motor 8 drives the augers at all levels through the gear 11 Turning, the wet sludge is in direct contact with the superheated steam from top to bottom for heat exchange step by step under the agitation of the double auger, and the moisture content of the sludge is reduced to below 10%. The sludge outflow pipe 27 enters the storage bin 14, and the superheated steam The temperature drops to 120°C-180°C and enters the cyclone separator 15 through the steam outlet pipe 26. After the steam is separated by the cyclone separator 15, the dust enters the storage bin 14 through the dust conveying pipe 28, and the dust and dry sludge pass through the sewage The mud pipe 29 enters the fluidized bed sludge incinerator 1 for combustion, and the flue gas generated by the combustion is discharged through the high-temperature flue gas pipe 39, which is the first heat exchanger 3 and the secondary air preheater on the high-temperature flue gas pipe 39 4 and the primary air preheater 2 provide heat, and part of the steam separated by the cyclone separator 15 enters the first heat exchanger 3 under the action of the circulating fan 16, and the steam exchanges heat with the first heat exchanger 3 and raises the temperature to 250°C to 450°C, when the furnace is started, the humidifier 22 sprays water mist and hot air to generate hot steam and then enters the drying chamber 23 through the steam inlet 12. After the wet sludge is dried for 1.5h-2h, close the humidifier 22 , the remaining steam separated by the cyclone separator 15 enters the second heat exchanger 18 to exchange heat with the air under the action of the circulating fan 16, and the air enters the second heat exchanger 18 from the first blower 17, and the temperature drops to 80°C The remaining steam enters the spray tower 19 for spraying and dehydration, and the generated sewage flows out through the sewage outflow pipe 35, and the non-condensable gas in the spray tower 19 flows back to the fluidized bed sludge incinerator 1 through the non-condensable gas delivery pipe 34 for combustion , the air required for sludge incineration is sent to the fluidized bed sludge incinerator 1 through the second heat exchanger 18 under the action of the first blower 17 and then through the primary air preheater 2 and the secondary air preheater 4 Participate in combustion.

This embodiment is completed by adopting the sludge fluidized bed incineration treatment device with six or seven stages of auger in the seventh embodiment.

Specific Embodiment Nine: This embodiment is described in conjunction with Fig. 4. The sludge fluidized bed incineration treatment method of this embodiment: when the heat value of the dry sludge is 3500Kcal/kg, the wet sludge with a moisture content of 80% is produced from the wet sludge The mud inlet 13 enters the drying chamber 23, and at the same time, superheated steam of 250°C to 450°C enters the drying chamber 23 through the steam inlet 12; the motor 8 drives the augers at all levels to rotate through the gear 11, and the wet sludge is stirred by the double auger From top to bottom, it directly contacts with superheated steam for heat exchange step by step. The moisture content of the sludge drops below 10% and enters the storage bin 14 through the sludge outflow pipe 27, and the temperature of the superheated steam drops to 120°C-180°C. The steam pipe 26 enters the cyclone separator 15, and after the steam is separated by the cyclone separator 15, the dust enters the storage bin 14 through the dust conveying pipe 28, and the dust enters the fluidized bed sludge incinerator through the sludge pipeline 29 together with the dry sludge 1 for combustion, and the flue gas produced by combustion is discharged through the high-temperature flue gas pipe 39, and at the same time provides heat for the first heat exchanger 3, the secondary air preheater 4 and the primary air preheater 2 on the high-temperature flue gas pipe 39 Part of the steam separated by the cyclone separator 15 enters the first heat exchanger 3 under the action of the circulating fan 16, and the steam exchanges heat with the first heat exchanger 3 and raises the temperature to 250°C to 450°C. Humidifier 22 sprays water mist and hot air to generate hot steam and then enters drying chamber 23 through steam inlet 12. After the wet sludge is dried for 1.5h-2h, close humidifier 22, and the remaining steam separated by cyclone separator 15 Under the action of the circulating fan 16, it enters the second heat exchanger 18 to exchange heat with the air, the air enters the second heat exchanger 18 from the first blower 17, and the remaining steam whose temperature drops to 80°C enters the spray tower 19 for spraying and dehydration , the sewage produced flows out through the sewage outflow pipe 35, and the non-condensable gas in the spray tower 19 flows back to the fluidized bed sludge incinerator 1 through the non-condensable gas delivery pipe 34 to burn out, and the air required for sludge incineration is in the first Under the action of the blower 17, it is sent to the fluidized bed sludge incinerator 1 through the second heat exchanger 18 and then through the primary air preheater 2 and the secondary air preheater 4 to participate in combustion.

This embodiment is completed by adopting the sludge fluidized bed incineration treatment device with nine-stage auger in Embodiment 7.

Specific Embodiment Ten: This embodiment is described in conjunction with Fig. 4. The sludge fluidized bed incineration treatment method of this embodiment: when the calorific value of the dry sludge is less than 3500Kcal/kg and greater than 2000Kcal/kg, the wet sludge with a moisture content of 80% The sludge is first squeezed through a filter press until the water content is 50% to 60%, and then enters the drying chamber 23 through the wet sludge inlet 13, and at the same time, superheated steam at 250°C to 450°C enters the drying chamber 23 through the steam inlet 12 ; The motor 8 drives the augers at all levels to rotate through the gear 11, and the wet sludge is directly contacted with the superheated steam from top to bottom for heat exchange step by step under the agitation of the double auger, and the moisture content of the sludge drops below 10% and flows out of the sludge The pipe 27 enters the storage bin 14, and the temperature of the superheated steam drops to 120°C-180°C and enters the cyclone separator 15 through the steam outlet pipe 26. After the steam is separated by the cyclone separator 15, the dust enters the storage bin through the dust delivery pipe 28 14, the dust and dry sludge enter the fluidized bed sludge incinerator 1 through the sludge pipeline 29 for combustion, and the flue gas generated by the combustion is discharged through the high-temperature flue gas pipeline 39, and is the first high-temperature flue gas pipeline 39. The heat exchanger 3, the secondary air preheater 4 and the primary air preheater 2 provide heat, and part of the steam separated by the cyclone separator 15 enters the first heat exchanger 3 under the action of the circulating fan 16, and the steam Exchange heat with the first heat exchanger 3 and raise the temperature to 250°C to 450°C. When starting the furnace, the humidifier 22 sprays water mist and hot air to generate hot steam and then enters the drying chamber 23 through the steam inlet 12. When the wet sludge is dried After 1.5h-2h, close the humidifier 22, and the remaining steam separated by the cyclone separator 15 enters the second heat exchanger 18 to exchange heat with the air under the action of the circulating fan 16, and the air enters the second heat exchanger 18 from the first blower 17. Heat exchanger 18, the remaining steam whose temperature drops to 80°C enters the spray tower 19 for spraying and dehydration, the generated sewage flows out through the sewage outflow pipe 35, and the non-condensable gas in the spray tower 19 flows back through the non-condensable gas delivery pipe 34 Until the fluidized bed sludge incinerator 1 is burned out, the air required for sludge incineration passes through the second heat exchanger 18 under the action of the first blower 17, and then passes through the primary air preheater 2 and the secondary air preheater 4 into the fluidized bed sludge incinerator 1 to participate in combustion.

This embodiment is completed by adopting the sludge fluidized bed incineration treatment device with three to six stages of augers in the seventh embodiment.

Claims (10)

1. A sludge multistage dryer, characterized in that: the sludge multistage dryer includes a drying chamber (23), a motor (8), a plurality of gears (11), at least three stages of augers and augers The auger chassis (9) with the same number of dragon series; The at least three stages of augers are horizontally installed in the drying chamber (23) from top to bottom, adjacent augers on the same layer are arranged in a staggered manner, and an auger chassis (9) is arranged below each stage of augers (24), The motor (8) is installed on the outer wall of the drying chamber (23), the motor (8) establishes a transmission relationship with the augers at all levels through the gear (11), and the upper cover of the drying chamber (23) is provided with a wet sludge inlet (13 ), the upper part of the side wall of the drying chamber (23) is provided with a steam inlet (12), the bottom plate of the drying chamber (23) is provided with a dry sludge outlet (6), and the lower part of the side wall of the drying chamber (23) is provided with a steam outlet (5). 2. The sludge multi-stage dryer according to claim 1, characterized in that: each stage of auger comprises a pair of augers, named double auger (10), and the pair of augers are arranged side by side in the horizontal direction , the transmission relationship is established by gears (11) between the two augers, at least the double auger (10) in the same row in the three-stage auger is named as the drying section auger (25), and the two drying section augers (25 ) is provided with a support (21). 3. The sludge multi-stage dryer according to claim 1, characterized in that: each level of auger comprises a pair of augers, named double auger (10), and the pair of augers are arranged side by side in the horizontal direction , the transmission relationship is established through gears (11) between the two augers, at least the double auger (10) in the same row in the three-stage auger is named as the drying section auger (25), and the adjacent two drying section augers Supports (21) are arranged between the dragons (25). 4. The sludge multi-stage dryer according to claim 3, characterized in that: the sludge multi-stage dryer comprises a six-stage auger or a seven-stage auger. 5. The sludge multistage dryer according to claim 3, characterized in that: the sludge multistage dryer includes a nine-stage auger. 6. The sludge multistage dryer according to claim 3, characterized in that: the sludge multistage dryer includes three to six stages of augers. 7. adopt the sludge fluidized bed incineration treatment device of the sludge multistage dryer described in claim 4, it is characterized in that: the sludge fluidized bed incineration treatment device comprises a fluidized bed sludge incinerator (1), Primary air preheater (2), first heat exchanger (3), secondary air preheater (4), sludge multistage dryer (7), dry sludge storage bin (14), Cyclone separator (15), circulation blower (16), first air blower (17), second heat exchanger (18), spray tower (19), second air blower (20), humidifier (22), Steam outlet pipe (26), sludge outflow pipe (27), dust delivery pipe (28), sludge pipe (29), first steam flow pipe (30), second steam flow pipe (31), steam inlet Steam pipe (32), third steam flow pipe (33), noncondensable gas delivery pipe (34), sewage outflow pipe (35), air flow pipe (36), primary preheating air pipe (37), secondary Preheating air pipe (38) and high temperature flue gas pipe (39); The steam outlet (5) communicates with the upper part of the cyclone separator (15) through the steam outlet pipe (26), and the dry sludge outlet (6) communicates with the dry sludge storage bin (14) through the sludge outflow pipe (27) , the bottom of the cyclone separator (15) communicates with the dry sludge storage bin (14) through a dust conveying pipe (28), and the dry sludge storage bin (14) communicates with the fluidized bed sludge incinerator (1) through a sewage The mud pipeline (29) is communicated, the top of the cyclone separator (15) is communicated with the second heat exchanger (18) through the first steam flow through the pipe (30), and the circulation fan (16) is installed on the first steam flow through the pipe (30) Above, the circulating fan (16) communicates with the first heat exchanger (3) through the second steam flow pipe (31), and the first heat exchanger (3) communicates with the steam inlet (12) through the steam inlet pipe (32) , the humidifier (22) is installed on the steam inlet pipe (32), the bottom of the second heat exchanger (18) is equipped with a first blower (17), and the second heat exchanger (18) passes through the third steam flow The pipe (33) is communicated with the spray tower (19), and the spray tower (19) is communicated with the fluidized bed sludge incinerator (1) through the non-condensable gas delivery pipe (34), and the second air blower (20) is installed at On the condensate delivery pipe (34), the sewage outflow pipe (35) is installed on the spray tower (19), and the second heat exchanger (18) passes through the air flow pipe (36) and the primary air preheater (2) connected, the primary air preheater (2) communicates with the secondary air preheater (4) through the primary preheating air pipe (37), and the secondary air preheater (4) passes through the secondary preheating air pipe ( 38) Connected with the fluidized bed sludge incinerator (1), the high temperature flue gas pipeline (39) is installed at the flue gas outlet end of the fluidized bed sludge incinerator (1), the first heat exchanger (3), the second The first-stage air preheater (4) and the first-stage air preheater (2) are connected in series on the high-temperature flue gas pipeline (39) from left to right. 8. The method for sludge fluidized bed incineration treatment using the sludge fluidized bed incineration treatment device according to claim 7, characterized in that: the sludge fluidized bed incineration treatment method: when the dry sludge calorific value is 2000Kcal/ kg, the wet sludge is mechanically dehydrated and deeply press-filtered until the water content is 50% to 60%, and then enters the drying chamber (23) from the wet sludge inlet (13), and at the same time, superheated steam from 250°C to 450°C passes through The steam inlet (12) enters the drying chamber (23); the motor (8) drives the augers at all levels to rotate through the gear (11), and the wet sludge is in direct contact with the superheated steam step by step from top to bottom under the agitation of the double auger Heat exchange, the moisture content of the sludge is reduced to below 10%, enter the dry sludge storage bin (14) through the sludge outflow pipe (27), and the superheated steam temperature drops to 120°C-180°C through the steam outlet pipe (26) Enter the cyclone separator (15), after the steam is separated by the cyclone separator (15), the dust enters the dry sludge storage bin (14) through the dust conveying pipe (28), and the dust and the dry sludge pass through the sludge pipeline ( 29) Enter the fluidized bed sludge incinerator (1) for combustion, and the flue gas generated by combustion is discharged through the high-temperature flue gas pipeline (39), and is the first heat exchanger (3) on the high-temperature flue gas pipeline (39) at the same time , the secondary air preheater (4) and the primary air preheater (2) provide heat, and part of the steam separated by the cyclone separator (15) enters the first heat exchanger under the action of the circulating fan (16) Inside (3), the steam exchanges heat with the first heat exchanger (3) and heats up to 250°C to 450°C. When starting the furnace, the humidifier (22) sprays water mist and hot air to generate hot steam and then passes through the steam inlet (12 ) into the drying chamber (23), when the wet sludge is dried for 1.5h-2h, the humidifier (22) is closed, and the remaining steam separated by the cyclone separator (15) enters under the action of the circulating fan (16) The second heat exchanger (18) exchanges heat with air, the air enters the second heat exchanger (18) from the first blower (17), and the remaining steam whose temperature drops to 80°C enters the spray tower (19) for spray dehydration , the sewage produced flows out through the sewage outflow pipe (35), and the noncondensable gas in the spray tower (19) flows back to the fluidized bed sludge incinerator (1) through the noncondensable gas delivery pipe (34) to burn out, and the sludge The air required for incineration is sent to the fluidized bed through the second heat exchanger (18) and then through the primary air preheater (2) and secondary air preheater (4) under the action of the first blower (17). Participate in combustion in the sludge incinerator (1). 9. Adopt the sludge fluidized bed incineration treatment device of the sludge multistage dryer described in claim 5, it is characterized in that: the sludge fluidized bed incineration treatment device comprises a fluidized bed sludge incinerator (1), Primary air preheater (2), first heat exchanger (3), secondary air preheater (4), sludge multistage dryer (7), dry sludge storage bin (14), Cyclone separator (15), circulation blower (16), first air blower (17), second heat exchanger (18), spray tower (19), second air blower (20), humidifier (22), Steam outlet pipe (26), sludge outflow pipe (27), dust delivery pipe (28), sludge pipe (29), first steam flow pipe (30), second steam flow pipe (31), steam inlet Steam pipe (32), third steam flow pipe (33), noncondensable gas delivery pipe (34), sewage outflow pipe (35), air flow pipe (36), primary preheating air pipe (37), secondary Preheating air pipe (38) and high temperature flue gas pipe (39); The steam outlet (5) communicates with the upper part of the cyclone separator (15) through the steam outlet pipe (26), and the dry sludge outlet (6) communicates with the dry sludge storage bin (14) through the sludge outflow pipe (27) , the bottom of the cyclone separator (15) communicates with the dry sludge storage bin (14) through a dust conveying pipe (28), and the dry sludge storage bin (14) communicates with the fluidized bed sludge incinerator (1) through a sewage The mud pipeline (29) is communicated, the top of the cyclone separator (15) is communicated with the second heat exchanger (18) through the first steam flow through the pipe (30), and the circulation fan (16) is installed on the first steam flow through the pipe (30) Above, the circulating fan (16) communicates with the first heat exchanger (3) through the second steam flow pipe (31), and the first heat exchanger (3) communicates with the steam inlet (12) through the steam inlet pipe (32) , the humidifier (22) is installed on the steam inlet pipe (32), the bottom of the second heat exchanger (18) is equipped with a first blower (17), and the second heat exchanger (18) passes through the third steam flow The pipe (33) is communicated with the spray tower (19), and the spray tower (19) is communicated with the fluidized bed sludge incinerator (1) through the non-condensable gas delivery pipe (34), and the second air blower (20) is installed at On the condensate delivery pipe (34), the sewage outflow pipe (35) is installed on the spray tower (19), and the second heat exchanger (18) passes through the air flow pipe (36) and the primary air preheater (2) connected, the primary air preheater (2) communicates with the secondary air preheater (4) through the primary preheating air pipe (37), and the secondary air preheater (4) passes through the secondary preheating air pipe ( 38) Connected with the fluidized bed sludge incinerator (1), the high temperature flue gas pipeline (39) is installed at the flue gas outlet end of the fluidized bed sludge incinerator (1), the first heat exchanger (3), the second The first-stage air preheater (4) and the first-stage air preheater (2) are connected in series on the high-temperature flue gas pipeline (39) from left to right. 10. The method for sludge fluidized bed incineration treatment using the sludge fluidized bed incineration treatment device according to claim 9, characterized in that: the sludge fluidized bed incineration treatment method: when the heat value of the dried sludge is 3500Kcal/ kg, wet sludge with a moisture content of 80% enters the drying chamber (23) from the wet sludge inlet (13), and at the same time, superheated steam at 250°C to 450°C enters the drying chamber (23) through the steam inlet (12). Inside; the motor (8) drives the augers at all levels to rotate through the gear (11), and the wet sludge is directly contacted with the superheated steam from top to bottom to exchange heat step by step under the agitation of the double auger, and the moisture content of the sludge is reduced to 10%. Next, the sludge outlet pipe (27) enters the dry sludge storage bin (14), and the superheated steam temperature drops to 120°C-180°C, enters the cyclone separator (15) through the steam outlet pipe (26), and the steam passes through the cyclone After the separator (15) is separated, the dust enters the dry sludge storage bin (14) through the dust conveying pipe (28), and the dust and the dry sludge enter the fluidized bed sludge incinerator ( 1) Combustion, the flue gas produced by combustion is discharged through the high-temperature flue gas pipeline (39), and is simultaneously the first heat exchanger (3), the secondary air preheater (4) and the high-temperature flue gas pipeline (39) The primary air preheater (2) provides heat, and part of the steam separated by the cyclone separator (15) enters the first heat exchanger (3) under the action of the circulating fan (16), and the steam exchanges heat with the first The heat transfer device (3) heats up to 250°C to 450°C. When starting the furnace, the humidifier (22) sprays water mist and hot air to generate hot steam, and then enters the drying chamber (23) through the steam inlet (12). After the sludge is dried for 1.5h-2h, the humidifier (22) is closed, and the remaining steam separated by the cyclone separator (15) enters the second heat exchanger (18) to exchange air with the air under the action of the circulating fan (16). Heat, air enters the second heat exchanger (18) from the first blower (17), and the remaining steam whose temperature drops to 80°C enters the spray tower (19) for spraying and dehydration, and the generated sewage passes through the sewage outflow pipe (35) Outflow, the non-condensable gas in the spray tower (19) is returned to the fluidized bed sludge incinerator (1) by the non-condensable gas delivery pipe (34) to burn out, and the air needed for sludge incineration is in the first blower (17 ) through the second heat exchanger (18) and then through the primary air preheater (2) and secondary air preheater (4) into the fluidized bed sludge incinerator (1) to participate in combustion.

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