KR20060129144A - The organic sludge treatment machine - Google Patents

Abstract

An organic sludge treatment apparatus is provided to effectively dry and burn up the organic sludge by the thermal transmission oil. A vaporizer(1) includes a moving apparatus(12) for continuously moving the sludge compound through a discharge hole(15) to a residual moisture vaporizer(2). A connection pipe(13) transmits the vapor to a condenser(7). An oil floor heating system(11) receives the high temperature oil(17) heated by a boiler(5) and manages the oil temperature as above 100 degrees in centigrade. An oil vaporizer(3) vaporizes and recovers the heat treatment oil. A sludge-oil mixer(6) agitates the sludge and the heat treatment oil so that the sludge mixture is produced.

Description

Organic sludge treatment machine

1 is a schematic diagram of organic sludge treatment apparatus

2 is a front view of a steam condenser and a pressure sensitive steam generator.

<Description of the code | symbol about the principal part of drawing>

1 evaporator 2 residual moisture evaporator

3: oil vaporizer 4: incinerator

5: boiler 6: sludge-oil mixer

7 condenser 76 pressure-sensitive steam generator

An object of the present invention is to devise a sludge drying and incineration technology for environmentally friendly and economical treatment of organic sludge that is currently disposed of as marine dumping in Korea, not only to prevent marine pollution, but also to recover the high calorie value possessed by organic sludge. It is to secure renewable energy recovery technology to produce clean steam.

Organic sludge produced in sewage treatment plant and animal husbandry complex has high water content and high odor, and its large amount of waste is a waste that causes secondary environmental pollution if left untreated. In Korea, most of the organic sludge is treated by ocean dumping in the sea, and the amount is rapidly increased from 107 million tons in 1990 to 7.1 million tons in 2000 and 9.993 million tons in 2005. Organic sludge has valuable heat as renewable energy, but it is worth using as renewable energy. However, their water content is too high and the current technology does not dry well. The situation is dumping at sea.

To utilize the heat of organic sludge, it is necessary to dry the sludge. The conventional sludge drying technology is classified into a direct drying method in which the sludge is dried directly with combustion air, and the hot plate is heated by the heat of combustion to contact the sludge to dry the sludge. It is divided into indirect drying method. The direct drying method is advantageous in terms of thermal efficiency and simpler installation than the indirect drying method because the sludge is directly contacted and dried in the hot combustion gas, but this method generates odor during drying and dust is discharged with the combustion gas to remove them. There is a need for large-scale treatment facilities. In the indirect drying method, on the other hand, the combustion gas heats the heating medium first, and when the heating medium heats the hot plate such as the drying tank or disk again, the sludge is indirectly supplied with the thermal energy from the hot plate to dry the passage of the combustion gas and the dry matter. It can be separated to prevent odors and dusts and to control the drying rate, but this method has high drying cost and low fuel cost.

Currently, 250kg of petroleum is used to dry 1 ton of sludge in the direct drying method, which is about 2,700,000 Kcal, which is 5.4 times the net required amount of 500,000Kcal, and its thermal efficiency is only 18.5%. Calories less than 700,000 Kcal The reason for this low sludge drying efficiency is that heat is not transferred into the sludge. For example, in the case of sludge that is in contact with a heated hot plate of 400 ° C. or higher, the contact surface with the hot plate is heated rapidly, and the temperature reaches 100 ° C. immediately. However, from this time, vaporization of moisture starts and the temperature is maintained at 100 ° C. until all the moisture on the contact surface evaporates, so that the hot plate and the sludge contact surface form a temperature discontinuity surface to prevent heat energy from being transferred into the sludge. The dried sludge forms an air layer and prevents heat transfer from the hot plate to the inside of the sludge by strong heat insulation action, and even though the hot plate is overheated and burned by this temperature discontinuity and the air layer heat action, the sludge inside cannot be transferred to the heat energy. In order to solve this problem, an extreme partial drying phenomenon is maintained. In order to solve this problem, even when the sludge is forcibly stirred, the temperature discontinuity surface and the air layer insulation action continue to occur at the contact surface of the sludge with the hot plate, thereby greatly reducing the drying efficiency.

Existing drying methods do not technically overcome the drying characteristics of the sludge, so the drying efficiency is very low, so it takes a long time to dry, and it takes a lot of fuel cost, and it requires large facility investment cost by raising the scale to supplement the low efficiency. Complaints have arisen due to heavy odors, and until now, organic sludges have not been effectively dried, so they cannot use the calorie content of organic sludges at all, and are being disposed of by dumping at sea.

Therefore, the present invention proposes the following technical problem to solve the above problems.

In the present invention, it is necessary to develop a new drying technology to overcome the temperature discontinuity surface and air layer insulation action caused by the drying of the sludge, and this technology is configured to increase the energy efficiency of the system to enter less heat than the heat recovery recovered organic sludge Develops a renewable energy process that prevents the odor of water vapor emitted during the drying process and recovers the energy.In the incineration of dried organic sludge, an efficient high-temperature incineration unit is constructed, which is economical and environmental. Developing friendly methods and devices is a technical challenge.

First, we devised a process to economically and inexpensively dry organic sludge by devising a new heat transfer technology without temperature discontinuity and air layer insulation so as to drastically improve the low drying efficiency of conventional sludge drying in organic sludge drying. In addition, eco-friendly treatment is performed to prevent odors and dusts from occurring during the drying process, and the foundation can be used to recover energy by using water vapor generated and to utilize dried organic sludge as renewable energy.

To this end, in the present invention, a heat transfer oil having a higher boiling point than water is introduced as a heat transfer catalyst and mixed with sludge to proceed heat transfer in a horizontal hot plate to prevent temperature discontinuity and thermal insulation between the hot plate and the sludge, thereby rapidly and rapidly converting into sludge in the hot plate. The continuous heat transfer is designed to completely dry the sludge. This method is described in detail. When organic sludge having a water content of 80% is mixed with heat transfer oil at an appropriate ratio and placed on a hot plate placed in a horizontal plane, the mixture has good fluidity and adheres to the hot plate to form a high thermal conductivity structure. When the temperature of the contact surface reaches 100 ° C, the heat energy supply is rapidly progressed, and the water in the sludge of the contact surface starts to vaporize, but the heat transfer oil mixed together rapidly heats the thermal energy of the hot plate as the temperature rises without high vaporization. The heat dissipation catalyst acts as a heat transfer catalyst to transfer the inside of the mixture. Therefore, no thermal discontinuity surface occurs, and thermal energy is continuously transferred to the inside of the mixture through the heat transfer oil. When the heat transfer oil inside the sludge is heated, the sludge temperature around it also reaches 100 ℃, so that the sludge evaporates in a much larger area than the contact surface with the hot plate. Since they are evenly mixed, heat energy is transferred to the mixture premises, and vaporization continues.

In addition, if the space occupied by water is initially empty due to vaporization, the heat transfer oil in the vicinity is lowered and filled to maintain the thermal contact between the hot plate and the mixture so that thermal insulation does not occur and the drying efficiency is drastically improved. Since the boiling point remains higher than water and does not vaporize, heat transfer continues without the occurrence of adiabatic spaces until complete drying.

As described above, the heat transfer oil can drastically improve the drying efficiency of the sludge, and if this drying method is applied, it is possible to completely dry the organic sludge having a water content of 80% only by the amount of heat retained by the organic sludge. Can be used as fuel for boilers in incinerators.

In addition, if the drying efficiency is high, a large amount of water is continuously generated. If the condensate is recovered from the condenser in conjunction with the pressure-sensitive steam generator in a sealed state so that the steam does not leak out, all the energy of the generated water vapor can be recovered as clean steam. .

In order to realize the technical problem as described above, it is another technical problem of the present invention to develop an organic sludge treatment apparatus having a low production cost and operation cost by constructing a device so that all facilities and devices can be continuously and automated. to be.

In order to achieve the technical objects and objects of the present invention as described above with reference to the accompanying drawings showing a specific configuration of the present invention will be described a preferred embodiment of the present invention.

1 is a schematic diagram of an organic sludge treatment apparatus according to the present invention, and FIG. 2 is a front view of a steam condenser and a reduced pressure steam generator. Where 1 is an evaporator in which the sludge and heat transfer oil mixture is dried, 2 is an residual moisture evaporator in the mixture, 3 is an oil vaporizer to evaporate the heat transfer oil of the mussel, and 4 is an incinerator which obtains thermal energy by incineration of the dried sludge. 5 is a boiler that heats the cucumbers using the heat of the incinerator and supplies the heated oil to the oil ondol, 6 is a mixer which produces a mixture of sludge and heat transfer oil, and 7 is condensed and discharged from the steam generated. It is a condenser that produces steam.

The heat transfer oil acts as a catalyst for drying the sludge, so that a suitable fuel oil having a boiling point between these temperatures can be used in the distillation recovery process of the oil vaporizer so that the boiling point of water is higher than 100 ° C and distillation recovery is possible at a temperature of 300 ° C. The remaining amount of heat transfer oil can be incinerated in the incinerator of dry sludge.

In addition, the evaporator (1) is a mixture of the sludge and heat transfer oil supplied through the injector 63 is supplied with heat energy from the oil ondol (11) of the flat bottom of the hot plate vaporizes the water inside the sludge evaporated into water vapor and dried In the core facility of the present invention, in order to continuously dry the sludge mixture to the outlet 15 for discharging the sludge mixture injected through the injector 63 to the residual water evaporator (2) at the bottom of the oil ondol (11) It is equipped with a moving device (12) for continuously moving and secures a sufficient space to accommodate the bubbles that may occur in the drying of the sludge mixture, and the whole is a closed structure, all the generated steam to the condenser (7) It has an outgoing tube (13) and the oil ondol (11) of this evaporator provides hot oil (17) heated from the boiler (5) to a suitable temperature. Receiving, passing the low temperature heat energy to the mixture oil (18), the boiler also dolahganeunde evaporator efficiency according to the type of the organic matter sludge is up and manages the oil temperature to the low temperature oil is held above 100 ℃.

In addition, the residual moisture evaporator (2) is separated in order to differentiate the thermal energy supply to match the evaporation characteristics of the residual moisture that proceeds slowly as the evaporation characteristics of the sludge evaporated, the oil ondol 21 of the residual moisture evaporator is 100 Maintaining the temperature above ℃ and sending the generated steam to the condenser (7) and the dried sludge mixture is sent to the connected oil vaporizer (3), all also made of a closed structure.

In addition, the oil vaporizer 3 is a device for vaporizing and recovering the heat transfer oil in the dried mixture, the oil ondol 31 of the oil vaporizer is maintained at a high temperature of 350 ℃ to completely vaporize the heat transfer oil to generate the oil vapor ( 32) is sent back to the sludge-oil mixer (6) for reuse as a heat transfer catalyst material and the remaining high temperature sludge is incinerated in the incinerator (4) via the storage tank (33), and heat energy for drying is supplied to the boiler (5). Supply.

In addition, the sludge-oil mixer 6 is a place where the sludge supplied from the sludge storage tank 61 and the heat transfer oil are well stirred and mixed to form a sludge mixture. In particular, the high temperature heat transfer oil vapor and the low temperature recovered from the oil vaporizer 3 are low. It is designed to increase the drying efficiency in the evaporator (1) by mixing the sludge of the sludge and the oil that is not recovered from the oil vaporizer is replenished from the connected oil tank (62) and the resulting mixture is connected to the injector ( It is configured to be supplied to the evaporator 1 through 63.

In addition, the steam condenser (7) is a heat exchanger for recovering the entire amount of condensed water so as not to flow out a large amount of water vapor generated in the evaporator (1) and the residual moisture evaporator (2) to the external cooling water supply pipe 71 and the condensate discharge pipe ( 72) is installed, the condensate water 83 which is discharged to room temperature after heat exchange is separated into heat transfer oil and discharge water through the oil water separator 73, the discharge water is connected to the simple purifier 74, purified after discharge (75) and separated and recovered The heat transfer oil is configured to be sent to the oil tank 66. The condenser is equipped with a pressure-sensitive steam generator 76 and a hot water heat exchanger 77 to recover the thermal energy of water vapor and to be clean with the cooling water 79 supplied from the outside. Produces steam 78.

In addition, the boiler (5) produces a high temperature oil of 350 ℃ using the heat generated in the incinerator (4) of the dried sludge, and supply the high temperature oil of 350 ℃ directly to the oil vaporizer (3) and each of the two evaporators The oil ondol is composed of a distributor 52 for supplying heating oil by mixing at a reasonable ratio with the low temperature oil recovered to meet the required temperature.

In addition, the incinerator (4) is a facility for incineration of sludge remaining in the oil vaporizer (3) to around 350 ℃ in the complete powder incineration heating sludge together with the heating air 41 preheated by the exhaust gas heat exchanger to the nozzle 42 It is configured to burn completely at high temperature by spraying, and it is equipped with a combustion control device to fit the required heat amount in the boiler (5), and is equipped with an auxiliary combustion device and a fuel tank for emergency such as initial operation or lack of heat.

Referring to the preferred embodiment of the present invention using the above-described device to the sludge-oil mixer (6) to the sludge-oil mixer (6) of the organic sludge of about 80% of the moisture content stored in the storage tank 61 is brought in (64) from the outside In this mixer, light oil, which is fuel oil, is mixed as sludge and proper ratio by using heat transfer oil. Especially, as the temperature of the mixture introduced into the evaporator 1 approaches 100 ° C., vaporization occurs immediately in the evaporator. The sludge inside and outside ℃ is mixed with the oil vapor of about 300 ℃ recovered from the oil vaporizer (3) to improve the temperature, the heat transfer oil not recovered as steam is supplied from the oil tank (66) to make a mixture of the proper ratio injector Input to the evaporator (1) through (63). The evaporator 1 has an oil ondol 11 installed at about 200 ° C. at the bottom, which serves as a hot plate, which allows rapid heat transfer to the injected mixture and rapidly evaporates moisture of the sludge. The mixture passes the evaporator for about 30 minutes. It is equipped with a moving device 12 to move the mixture at a constant speed so as to have a suitable scale so that the mixture passed through the evaporator is passed through the mill 16 to the residual moisture evaporator (2). As the final drying of the sludge is slow, the top of the heat transfer oil contained in the residual moisture evaporator in which the oil ondol (21) of about 150 ° C. is installed by changing the shape so as to flatten the sludge dry matter mass with the grinder 16 to promote evaporation. When it is dropped into the evaporator, the complete evaporation proceeds slowly and descends to the bottom of the evaporator. The fully evaporated mixture is introduced into the oil vaporizer 3 through the screw conveyor 22. The oil vaporizer 3 is installed with an oil ondol 31 at 350 ° C. to quickly vaporize the heat transfer oil of the dried mixture to form dry sludge, and the generated oil vapor 32 is transferred to the sludge-oil mixer 6. The dried sludge has more than 3500 Kcal of heat per 1kg, and when it is used as fuel of incinerator, it supplies enough heat energy for sludge drying with 80% moisture content as the heat of sludge itself, even if the heat efficiency of the entire device is maintained only about 75%. In order to improve the thermal efficiency of the incinerator 4, the heat of the combustion gas 43 is recovered, and the supply air 41 is heated to 350 ° C. or higher to burn high temperature dry sludge. The temperature is maintained and the oil is heated to 350 ° C. in the oil boiler 51 using the heat energy and sent to the oil distributor 52. The oil vaporizer 3 supplies the oil ondol to the oil vaporizer 3. The heating oil is directly supplied, and the low temperature oil and the titrated oil are recovered to supply the evaporator 1 with 200 ° C. and the residual moisture evaporator 2 with 150 ° C. Low-temperature oil (18) yulryo loss of thermal energy which is mixed with feed and recovered after use are re-directed to the heating boiler (51). The large amount of water vapor generated in the evaporator exits to the water vapor outlet 13 located above the evaporator 1 and uses the coolant 79 through the heat exchanger 77 connected to the pressure-sensitive steam generator 76 in the condenser 7 connected thereto. The steam 81 of the evaporator is recovered to the total amount of condensate 83, and the recovered condensate is separated into heat transfer oil and discharge water in the oil / water separator 73, and the heat transfer oil is transferred to the oil tank 62. The waste water is recycled to the sludge-oil mixture, and the discharged water is discharged 75 after the water purification treatment in the simple purifier 74 so that no odor occurs at all.

Referring to the pressure-sensitive steam generator of the condenser 7, which is another key device of the present invention, the water vapor 81 at 100 ° C generated by the evaporator is introduced into the inlet of the condenser, and the suction blower 80 connected to the pressure-sensitive steam generator 76 is provided. When the pressure of the evaporator plate 85 is reduced to 500 mmHg (approximately 0.66 atm), the cooling water inside the evaporator plate undergoes vigorous vaporization at 89 ° C. to maintain the surface temperature of the evaporator plate at 89 ° C., thereby introducing water vapor 81 from the evaporator. As a result, the water vapor becomes condensed water at 89 ° C., and drops to the bottom, enters the heat exchanger 77 through the drain pipe 82, and exchanges heat with the coolant 79 at room temperature supplied from the outside. 83) is discharged to the oil and water separator (73) through the connecting tube (72), the supplied clean cooling water is heated to 89 ℃ through heat exchange with the condensate water is evaporated plate of the pressure-sensitive steam generator 76 through the supply pipe (84) (85) When supplied, the thermal energy is transferred from water vapor at 100 ° C, but the suction blower vaporizes at 89 ° C under reduced pressure to 500mmHg to generate clean steam. The evaporation plate is equipped with a valve 86 which maintains a constant level of water, and evaporates the amount. As much cooling water is supplied as possible, through the heat exchange of the generated 89 ° C steam and the incoming 100 ° C steam, the steam becomes 100 ° C and passes through the blower 80, whereby clean steam 78 is produced, which is a renewable energy source in the dry steam. It produces clean steam.

As described above, the present invention uses a heat transfer oil having a boiling point higher than that of water to completely dry the sludge and incinerate the dried organic sludge to receive all the heat energy required for drying, and to clean steam using steam generated during the drying process. The organic sludge treatment apparatus for producing is composed of a sludge-oil mixer, an evaporator, a residual moisture evaporator, an oil vaporizer, an incinerator, a boiler, a steam condenser, and a pressure-sensitive steam generator.

The present invention as described above is not limited to the present embodiment, it will be appreciated that modifications can be made within the scope without departing from the spirit of the present invention.

Through the present invention, the organic sludge which is difficult to be treated by the technology up to now has been economically and neatly dried incinerated through the present invention to replace marine dumping, thereby developing eco-friendly technology to prevent international pollution and to prevent marine pollution. All evaporators are sealed and dried without any dust or odor. The odorous water vapor from the evaporator is recovered as condensate and discharged after purification. This device is a sewage treatment plant or livestock complex where organic sludge is generated. It is easy to install in the neighborhood, which reduces the transportation cost for sludge disposal and helps to protect the environment by reducing air pollutants from large vehicles.

In the present invention, the method of drastically improving the thermal efficiency of the sludge drying apparatus is developed to utilize the calorie possessed by organic sludge to completely dry the sludge, and the steam generated in the sludge drying process can be cleaned through the condenser connected to the pressure reducing steam generator. It is used to produce renewable energy, which is calculated as 200Kg of dry sludge is recovered per ton for 80% water content, and this dry sludge has about 3500Kcal of heat per 1Kg, which is 700,000 Kcal per ton of sludge. It is possible to recover the oil, which is equivalent to 70 liters of oil, and it is expected that 70 million liters of oil will be replaced when treating 1 million tons of organic sludge, contributing to the prevention of global warming.

In addition, the present invention has devised a drying process that can continuously proceed the drying and incineration process of organic sludge by automating the whole process, in particular, the new heat transfer oil technology significantly improves the drying efficiency and does not require a deodorization equipment of high cost, drying device By reducing the size and parts of the system to a larger size than the existing facilities, it is possible to develop high-efficiency devices with low facility and operating costs.

Claims (5)

Heat transfer oil with higher boiling point than water is mixed with sludge and proper ratio with heat transfer catalyst material so that heat transfer between hot plate and sludge can proceed quickly and continuously, and the mixture is placed on a hot plate on a horizontal plane to heat transfer catalysis of heat transfer oil. Sludge drying method using heat transfer oil to drastically improve the drying efficiency of the sludge by preventing the occurrence of thermal discontinuity and thermal insulation between the hot plate and the sludge Sludge drying method using heat transfer oil, sludge-oil mixer (6), sludge injector (63), evaporator with oil ondol (1), residual water evaporator (2), oil vaporizer (3), incinerator (4) ), A sludge treatment apparatus for drying and incineration organic sludge quickly and efficiently using a fuel oil as a heat transfer oil and an organically constructed boiler 5 and a steam condenser 7 as shown in FIG. The method of claim 2, Operate the suction blower 80 connected to the pressure-sensitive steam generator 76 to reduce the pressure of the steam generating plate 85 to lower the boiling point of the cooling water contained therein to 100 ° C. or less, and condensate the water vapor 81 at a low temperature. Using a pressure-sensitive steam generator which condenses naturally to 83 to release heat energy, and absorbs the released heat energy into cooling water 79 inside the steam generating plate to vaporize into steam 78 under reduced pressure. Sludge treatment device to recover the latent heat of the steam (81) generated during the sludge drying process to produce clean steam The method of claim 2, Sludge treatment apparatus using oil ondol 11 having high thermal efficiency as a hot plate of sludge drying evaporator The method of claim 2, Sludge-oil mixer which mixes the high temperature heat transfer oil vapor recovered from the oil vaporizer 3 to room temperature sludge to make the mixture close to 100 ° C

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