Steam thermal hydrolysis reactor having moisture content control function for producing bio solid raw material

Abstract

The present invention relates to a steam thermal hydrolysis reactor having a water content control function for eco-friendly treating various organic wastes, such as household waste and food waste, and producing a bio-solid raw material (Bio-SRM) as a by-product.

Description

Steam thermal hydrolysis reactor with moisture content control function for biosolid raw material production

[0001] The present invention relates to a steam thermal hydrolysis reactor having a moisture content control function for producing bio-solid raw materials (BIO-SRM) by steam thermal hydrolysis of organic waste, wherein biomass energy is a general term for liquid, gas, and solid fuels utilizing biomass resources.

[0002]

[0003] The Earth is suffering from all kinds of waste.

[0004] An untold amount of waste, including household waste, marine debris, food waste, agricultural and fishery waste, discarded clothing and plastics, hospital waste, animal waste, livestock waste, and sewage sludge, is destroying the global environment. Technologies are being developed to process this waste in an environmentally friendly manner and recycle it.

[0005] For example, household waste can be recycled into BIO-SRF, food waste into BIO-Pellet Feet or BIO-Pellet Compost, waste plastics into BIO-SRF, medical waste into BIO-SRF, animal waste and fish into BIO-Pellet Feet or BIO-Pellet Compost, and tangerine peels and shellfish into lightweight aggregate or lightweight insulation.

[0006] The produced bio-solid raw material (BIO-SRM) can be used directly as a fuel for power generation as bio-solid refuse fuel (BIO-SRF) depending on the type of waste, or can be dried and molded into BIO-SRF pellets to be used as a fuel for heating and power generation. It can also be made into pellet feed and pellet compost, and can be used as a light aggregate or a light insulation material after being molded.

[0007] However, solid fuel (SRF) is made from household waste, or food waste is turned into feed or compost, but household waste and plastics are crushed into small pieces and formed into solid fuel, food waste is dehydrated and dried into feed or compost, and wood pellets are solid fuel made by crushing wood. These methods are all biodegradable without any chemical decomposition process, so there are many environmental problems in recycling or reusing them.

[0008] In addition, waste plastics are separated and collected to be used as plastic raw materials or purified and recycled into bio-oil, but large-scale processing is limited due to increased initial investment costs and lack of operational economic feasibility. In addition, waste plastics that cannot be separated and collected are mixed with various pollutants, so the only options are incineration or landfill.

[0009] Methods for recycling such waste without incineration or landfilling include pyrolysis and hydrolysis.

[0010] Pyrolysis is a method of decomposing waste using high-temperature heat (400-600℃). Organic waste has a low flash point, so there is a constant risk of fire and explosion. In addition, as waste is thermally decomposed, it sticks to the equipment, requiring cleaning each time, so there are limitations in continuous processing of large-scale waste.

[0011] Hydrolysis methods include supercritical (374℃, 22.5MPa or higher) and subcritical (374℃, 22.5MPa or lower) treatment methods, but the supercritical treatment method has limitations in treating general waste due to technical difficulty and economic feasibility.

[0012] Therefore, while technologies related to subcritical processing are being developed, it is also true that many problems still need to be solved. Among them, looking only at the hydrolysis reactor, first, in the process of decomposing waste by feeding it into a sealed vessel (reactor) and supplying saturated steam at high temperature and high pressure, the saturated steam maintains the set pressure because the supply valve is open, but the temperature drops due to heat loss to the waste and the generation of condensate, which hinders proper reaction and decomposition and increases the reaction and decomposition time.

[0013] Second, condensate accumulates at the bottom of the reactor, and if the condensate generated during the reaction decomposition process is not discharged in a timely manner, there is a problem in that the waste absorbs the condensate as it rotates by the agitator, increasing the moisture content of the reactants.

[0014] Third, the steam compressed at high temperature and high pressure in the steam discharge stage after hydrolysis is completed is a polluted waste steam containing all kinds of compounds and cannot be discharged into the atmosphere, so it passes through a condenser and a plume facility. However, there is a problem in that the discharged steam rapidly expands and exceeds the capacity of the condenser, so it is discharged without being properly condensed, which brings about the limitations of the plume facility.

[0015] Fourth, in the stage of discharging solids, there is a discharge pipe and discharge valve at the bottom of the reactor, but there is a problem that waste accumulates during the waste input stage, is not stirred, is not properly decomposed, and is discharged together with the solids while being mixed with sludge and condensate generated during the reaction decomposition process.

[0016] Fifth, the discharged solids have a high moisture content, making it difficult to separate the condensate and solids, and a dehydration process is required to enable conveyor transport. In addition, the high moisture content and high heat capacity require a lot of energy and time in the drying process, making the post-processing process complex.

[0017] Sixth, in the process of waste decomposition, it is decomposed into liquefaction and then solidification. During the liquefaction process, highly viscous sewage sludge and adhesive synthetic fibers and plastics stick to the reactor and agitator and become fixed.

[0018] Seventh, to reduce the aforementioned clinker phenomenon, steam is supplied by creating a steam flow hole in the agitator shaft. However, since steam is supplied only as much as the pressure drops during the reaction and decomposition, the amount supplied is small, and the desired effect cannot be achieved. However, in a continuous process, the initial steam supply is possible, which has the advantage of eliminating the need for repeated cleaning, but the high moisture content limits the reduction of the clinker phenomenon.

[0019] In addition, the supply of levitating steam can help in the decomposition of the reaction by stirring the reactants by levitating them, but this too is difficult to achieve the desired effect due to the small amount of steam supplied during operation.

[0020] Eighth, even in the drying stage, solids with high moisture content have a problem of reduced yield due to clanking phenomenon in the lift and spiral guide of the rotary kiln and the blade, which is the internal rotating body of the drum.

[0021] Ninth, after the waste is decomposed and reacted, additional materials are input in addition to the waste to absorb the moisture content during the input stage for solidification. Rice husks or sawdust are mainly used. Depending on the moisture content of the input waste, the amount of auxiliary materials input may be large, which causes a problem of reduced processing capacity and increased cost of auxiliary materials.

[0022] In order to solve such problems, the present invention has been devised based on the aforementioned background technology, and the non-separable household waste is made up of waste plastics of the PE&PP series, including vinyl and styrofoam, which account for more than 60%, and the rest is made up of wood (paper, wet tissues, etc.) and clothing (cotton, masks, etc.), and all kinds of waste are discharged mixed together. The purpose of the present invention is to provide a steam thermal hydrolysis reactor with a moisture content control function for producing bio-solid raw materials, which can solve the nine problems mentioned above in a hydrolysis process that produces bio-solid raw materials as a by-product and treats such waste in an environmentally friendly manner without incineration or landfill.

[0023] The main components of the steam thermal hydrolysis reactor with a moisture content control function for producing bio-solid raw materials of the present invention to achieve such a task are as follows: an inlet for injecting a reactant and an inlet-side valve are installed; a stirrer and a moisture content control steam discharge pipe (for both washing and steam supply) and a steam discharge pipe (for both washing and steam supply) are separately installed in the reactor body; a pressure sensor and a temperature and humidity sensor, an inlet-side washing pipe and a reactor washing pipe, a saturated steam supply pipe (for both washing) and a superheated steam supply pipe (for both washing) are installed; a condensate discharge pipe (for both washing and floating steam supply) is installed at the bottom of the reactor, and a flash tank is installed at the end of the condensate discharge pipe; a hatch cover and a discharge valve are installed at the solid raw material discharge port; and a bio-solid raw material recovery device is installed at the bottom.

[0024] In addition, in the solid raw material recovery device (600) at the bottom of the discharge valve, a sludge condensate recovery tank and a bio-solid raw material transfer device are arranged in a row on a bio-solid raw material recovery cart.

[0025] In addition, a steam boiler (S / B), a superheated steam boiler (SH / B), a saturated steam distributor (S / D), and a condenser (2000) for recovering and condensing the discharged steam are installed as auxiliary equipment for the reactor, and a separate water treatment facility is installed.

[0026] In addition, the steam thermal hydrolysis process steps are composed of a preparation step, an input and mixing step, a saturated steam hydrolysis step, a set temperature maintenance step during operation, a saturated steam discharge and condensate discharge step, a superheated steam primary moisture content adjustment step, a superheated steam thermal decomposition step, a set temperature maintenance step during thermal decomposition operation, a superheated steam secondary moisture content adjustment step, a superheated steam rapid discharge step, a moisture content additional adjustment step, a reactor bottom sludge and condensate recovery step, and a biosolids raw material recovery step, and the washing process step is performed separately.

[0027] In addition, in order to perform the above process steps, S / B always maintains the set pressure and temperature (2 MPa, 212°C) to enable continuous processing, and SH / B is controlled at the set pressure and temperature (1.5 MPa, 300°C) in the 1st and 2nd stages of thermal decomposition and moisture content control, at the set pressure and temperature (0.3 MPa, 200°C) in the 3rd stage of moisture content control, and at the set pressure and temperature (0.3 MPa, 160°C) in the 4th stage of moisture content control, thereby maintaining the set pressure and temperature for each process step.

[0028] In this process, since the pressure of the S / B increases in proportion to the temperature of the saturated steam, only the feed water pressure supplied to the S / B is supplied higher than the set pressure, and the steam boiler (S / B) is operated up to the set temperature.

[0029] In addition, since the superheated steam boiler (SH / B) receives saturated steam supplied from the S / B to the steam distributor (S / D), the set pressure can be maintained by controlling the saturated steam supply valve (CVG-19: including steam separator + pressure reducing valve), and the temperature can be maintained at the set temperature (△T3) by operating the SH / B.

[0030] In addition, the stirrer of the reactor is a device that stirs the reactants. The stirring shaft penetrates the reactor and is connected to a rotational power supply device. Inside the reactor, stirring blades are arranged on the stirring blade shaft in an appropriate structure to rotate and stir the reactants. The reactor and the stirring shaft adopt a grand packing structure to maintain the airtightness of the reactor.

[0031] In addition, the rotational power supply device is composed of a drive motor, a control unit, an inverter, and a position sensor, and supplies rotational power from 5 RPM to a maximum of 20 RPM based on the torque (torque: kgf.m) measured at the time when the reactants are injected and the saturated steam is supplied, and is controlled to enable forward and reverse rotation.

[0032] Therefore, in the function rate control step, rotational power is supplied at the highest RPM possible to maximize the dispersion of the reactants.

[0033] Meanwhile, the reactor's stirrer shaft is positioned slightly below the centerline of the reactor to secure a flow space for the reactants at the top of the reactor when the stirrer rotates. This also reduces the scattering of reactants and their discharge with the exhaust vapor when the steam discharge valve is opened after hydrolysis is complete. Therefore, if possible, it is preferable to install the steam discharge pipe at the top of the reactor.

[0034] In addition, a steam discharge valve is installed in the steam discharge pipe and the steam discharge pipe for controlling the moisture content, and a steam supply valve is installed between the discharge valve and the reactor to perform both steam supply and cleaning functions depending on the method of use.

[0035] In addition, a saturated steam supply pipe and a superheated steam supply pipe are installed between the discharge valve and the reactor in the condensate discharge pipe to provide both buoyant steam supply and cleaning.

[0036] Therefore, steam supply to the steam discharge pipe and condensate discharge pipe is combined to perform a cleaning function during operation, enabling a continuous process after completion of reaction decomposition without a separate cleaning step.

[0037] Meanwhile, the flash tank (F / T) is a flash tank with a structure that can discharge the wet steam and condensate whose temperature has dropped during the hydrolysis stage using saturated steam, and is maintained at the same pressure as the reactor. It is installed at a lower location than the reactor and has a structure that automatically recovers the condensate generated in the reactor by the height difference. When the condensate is discharged, the high-temperature and high-pressure condensate becomes flash steam and is discharged to the condenser and connected to the water treatment facility. The condensate generated in the reactor is condensate containing sludge and pollutants generated during the decomposition process of waste, and passes through the sludge recovery mesh and is collected in the flash tank. When discharged, the flash steam and condensate are discharged through a separate discharge pipe and connected to the water treatment facility.

[0038] In addition, the saturated steam supply to the reactor is started by opening the reactor steam supply valve to raise the pressure to the set pressure, and the steam supply to the flash tank is started by opening the flash tank steam supply valve installed at the bottom of the reactor so that the flash tank maintains the same set pressure as the reactor.

[0039] At this time, the condensate discharge valve of the reactor is left open, and the generated condensate automatically flows into the flash tank.

[0040] Additionally, when hydrolysis by saturated steam is completed, a step of discharging steam from the reactor and a step of discharging condensate from the flash tank are included.

[0041]

[0042] In addition, the waste inside the reactor may not be completely decomposed by hydrolysis using saturated steam, and the object to be treated has a high moisture content, so in order to completely decompose and control the moisture content, thermal decomposition using superheated steam and a moisture content control process are performed in parallel in stages.

[0043] In addition, in the step of discharging the biosolid raw material produced after the steam thermal hydrolysis step is completed, a step is needed to discharge the sludge and condensate without discharging the biosolid raw material even when the biosolid raw material discharge valve is opened because sludge and condensate are accumulated between the discharge pipe and the discharge valve installed at the bottom of the reactor.

[0044] Therefore, a hatch cover is installed on the discharge side of the lower part of the reactor so that it is closed during the reaction decomposition stage and the water content control stage, so that even if the produced solid discharge valve is opened, the biosolid raw material inside the reactor is not discharged, allowing the accumulated sludge and condensate to be discharged.

[0045] In addition, the rotational power supply device of the hatch cover is installed with a driving motor that rotates forward and backward only in a rotation range of 90°, and since the pressure of the reactor and the pressure of the discharge port are the same, a motor that can supply a rotational power (torque) that does not discharge the reactants even if the solid discharge valve is opened is installed.

[0046] Meanwhile, the amount of condensate generated from the reactants during the hydrolysis process is analyzed using household waste and food waste as examples, as shown in the table below.

[0047] Condensate generation amount of reactant (water content after saturated steam hydrolysis based on the water content at the reactant input stage) Classification Weight input amount Weight conversion water content Water content after decomposition Household waste 0.5 kg / m 3 5m 3 2,500kg65%(1.625L)70%Food waste0.9kg / m5m34,500kg90%(4.050L)95%

[0048] Calculation formula: Moisture content of waste = Weight of water in waste / Total weight of waste * 100 (%)

[0049] Moisture content and condensate generation amount and waste weight classification in the moisture content control stageWaste input amountMoisture contentSecond moisture content setting value (60%)Third moisture content setting value (50%)Fourth moisture content setting value (40%)Pellet moldingMoisture content (15%)Household waste 2,500kg70% / 1,750L1,125L / 625L discharge750L / 375L discharge500L / 250L discharge132.4L882.4kgFood waste 4,500kg95% / 4,275L337.5L / 3,937.5L discharge225L / 112.5L discharge150L / 75L discharge39.8L264.8kg

[0050] Analysis table, classification, input, condensate discharge, solids production, pellet production, household waste 5 m 3 (2,500kg)625L+375L+250L=1,250L1,250kg882.4kgfood waste5m 3 (4,500kg)3,937.5L+112.5L+75L=4,125L375kg264.8kg

[0051]

[0052] The results of analyzing the above table as an example show that, excluding the self-condensate by supplying saturated steam, if 2,500 kg (5㎥) of household waste, which is a pure reactant, is decomposed by reaction and discharged without a moisture content adjustment step, the moisture content is 70%, and 2,500 kg of reactant contains 1,750 L of water, which is 2.3 times more than the moisture content of 750 kg of solids, so it is discharged as a dilute solution of half water and half solids.

[0053] Also, if 4,500 kg of food waste is decomposed and discharged without a moisture content adjustment step, the moisture content is 95%, and the 4,500 kg of reactants contain 4,275 L of water, which is 19 times more than the moisture content of 225 kg of solids, so if discharged, it is like only water pouring out.

[0054] So, in general hydrolysis, a recovery tank is installed at the bottom of the discharge valve to separate the solids discharged as water, and the discharged reactants are collected, and the condensate is discharged with a pump to separate the water and reactants, and then a dehydrator such as a filter press, which is an extruder, is installed to dehydrate the solids to a moisture content of about 60-70%, which is enough for the conveyor to transport them.

[0055] The solids discharged in this way are transferred to a dryer and dried to a moisture content of approximately 40%, which is required for pellet formation.

[0056] Therefore, the post-processing process is complex, a lot of energy is consumed during the drying process, and it is difficult to install equipment to capture the flying white smoke.

[0057] Therefore, in the reactant input step, a secondary material capable of absorbing condensate for solid formation is input, and as shown in the table above, the input amount of the secondary material may be greater than the input amount of the reactant.

[0058] Additionally, the reaction time increases due to the moisture and condensate generated during the reaction process.

[0059] Therefore, according to the present invention, from the hydrolysis step using saturated steam, the condensate of saturated steam and the condensate generated by separating from waste during hydrolysis are discharged to a flash tank, and in addition, in the thermal decomposition step using superheated steam, the moisture content can be adjusted according to the type of waste so that the condition for pellet formation is optimal.

[0060] In addition, when the moisture content is adjusted to 40% according to the present invention and then discharged, 1,250 L of water contained in 2,500 kg of household waste is discharged, and only 500 L of water is contained in 1,250 kg of solid matter production, which is within the saturation moisture content, and thus is discharged as solid matter in the form of particles. In addition, 4,125 kg of water contained in 4,500 kg of food waste is discharged, and only 150 L of water is contained in 375 kg of solid matter production, which can be discharged as solid matter in the form of particles.

[0061] In addition, by discharging the wet steam and condensate whose temperature has dropped in the hydrolysis step and continuously implementing the step of controlling the moisture content of the reactants, the moisture content is lowered, so there is no need to input auxiliary materials, and there is no interruption to the reaction decomposition process. Although the reaction decomposition step is complicated, the reaction decomposition time can be reduced.

[0062] In addition, conveyor transport is possible without the condensate separation step, dehydration step, and drying step in the post-processing process, and the solids produced by forming them into pellets and adopting a low-temperature drying method are dried to a moisture content of 20-15% so that they can be stored for a long period of time and then transported to a storage tank.

[0063] Meanwhile, in the hydrolysis stage, the phenomenon of the reactants sticking to the reactor and stirrer during the decomposition process (clinker) occurs during the process of liquefying and decomposing viscous waste such as sewage sludge and oily synthetic fibers and plastics that have the property of sticking to each other. After the waste is completely decomposed or carbonized by superheated steam, the moisture in the liquefied waste is removed by adjusting the moisture content in the reactor itself, and it turns into solidified particles of about 1 to 20 mm and is mostly dropped by the stirrer.

[0064] Therefore, if the reaction time is not taken into consideration, it is advantageous to reduce the function rate as much as possible.

[0065] To further explain the process by which the reactants change into solid particles, the steam discharge valve of the reactor is mainly a ball valve that can be quickly opened and closed. When the valve is opened (OPEN), high-pressure steam is discharged, the pressure of the reactor drops rapidly, and the moisture in the reactants evaporates instantaneously, expands, and decomposes to form particles.

[0066] However, the effect of this expansion decomposition varies depending on the moisture content of the reactants. If the moisture content is higher than the saturated moisture content of the reactants, it expands into a dilute or concentrated solution.

[0067] Therefore, when the moisture content is adjusted after thermal decomposition by superheated steam and the set moisture content is reached, the steam can be expanded and decomposed into particles more effectively when rapidly discharged than when the steam is discharged in the hydrolysis step by saturated steam.

[0068] In addition, the steam from the reactor cannot be released into the atmosphere as a contaminated waste steam mixed with various compounds, but must pass through a condenser and a facility to remove white smoke. If the internal pressure of the condenser is calculated to be 0.12 MPa, the specific volume of the steam is 0.0996㎥ / kg when the pressure is 2 MPa, and increases approximately 39 times to 1.4285㎥ / kg in the condenser.

[0069] Therefore, referring to the table above, when 5㎥ of household waste is put into a 7㎥ reactor and hydrolyzed, 55.23㎥ of steam is compressed in the reactor, so when discharged, 2,135㎥ of waste steam is discharged to the condenser in an instant, and the condenser cannot receive it in time, resulting in the problem of it being discharged as white smoke.

[0070] In addition, in order to increase the expansion effect by lowering the condenser to negative pressure, the supply of cooling water increases accordingly, and in order to lower the temperature of the cooling water that has increased in the condenser, the size of the circulation water pump and cooling tower increases, so a lot of energy is consumed in the cooling process.

[0071] In addition, the cycle time for hydrolysis to be completed is usually less than 80 minutes, and steam is discharged within 1 to 2 minutes, so increasing the size of the condenser is inefficient from an economic perspective.

[0072] In the present invention, in order to reduce the above-mentioned problems and increase the expansion and decomposition effect, the moisture content is lowered by discharging wet steam and condensate at a temperature lowered during the setting temperature maintenance step during hydrolysis operation using saturated steam, so that the saturated steam after hydrolysis is not rapidly discharged but can be discharged by adjusting the discharge valve within the capacity limit of the condenser, and the expansion and decomposition effect can be relatively increased compared to general hydrolysis.

[0073] Also, in the thermal decomposition stage using superheated steam, the moisture content is lowered by discharging wet steam and condensate whose temperature has dropped during operation, and after the thermal decomposition is completed, the steam is discharged at the secondary moisture content set point (60%). The set pressure during thermal decomposition is 1.5 MPa, and the set temperature is △T℃, so the specific volume of the superheated steam is approximately 0.1697㎥ / kg, and 32.4㎥ of superheated steam is compressed in the reactor, and when discharged, it increases by approximately 22.7 times, and 736㎥ of steam flows into the condenser, so the discharge valve can be rapidly opened within the capacity limit of the condenser to increase the expansion and decomposition effect and expand and decompose it into particles.

[0074] Therefore, when expanded and decomposed into particle form, the clanker phenomenon in the reactor can be reduced, and in the post-processing process, transport by conveyor is possible without the condensate separation step and dehydration step, and even in the drying step of forming into pellets, there is no clanker phenomenon and solids can be dispersed, enabling miniaturization of the drying process.

[0075] In addition, in the drying stage, drying is a process of removing moisture from the produced solids. High temperature waste heat or preheated air contains moisture and consumes a lot of energy, but drying by superheated steam in the reactor itself is said to be more effective if the reaction time is not taken into consideration.

[0076] Therefore, lowering the water content by superheated steam in the reactor simplifies the post-processing process, and when looking at the entire process, energy consumption actually decreases.

[0077] Meanwhile, in the present invention, when reactive decomposition of general waste such as household waste and food waste is performed, no auxiliary materials are added. However, when only sewage sludge and synthetic fiber or plastic are added in full, mixing in 10 to 20% of auxiliary materials helps prevent the clanker phenomenon.

[0078] By configuring as described above and completing the reaction decomposition step by step, the purpose pursued by the present invention can be achieved.

[0079] When all organic wastes reach temperatures above 100℃, their inherent moisture evaporates or they absorb high-temperature moisture, causing the chemical bonds within their cell wall components to break. Depending on the temperature supplied, the rate of decomposition is proportional to the temperature and they undergo torrefaction and carbonization.

[0080] In the case of plastics, the melting point varies depending on the composition, but the synthetic fiber polyester is below 260℃, acrylic is around 240℃, nylon is around 250℃, and most PP&PE products have a melting point below 180℃.

[0081] Additionally, wood begins to color and carbonize when it reaches its flash point of 160℃ or higher, and carbonizes after a certain period of time.

[0082] According to an embodiment of the present invention, household waste, food waste, livestock manure, sewage sludge, waste plastics, medical waste, and animal carcasses [avian influenza (AI), African swine fever (ASF), foot-and-mouth disease (FDM), and natural carcasses] can be recycled in an environmentally friendly manner without mass landfilling or incineration, and large-scale waste disposal is possible, so that generated waste can be disposed of on the same day, thereby reducing dust and odors caused by open-air storage.

[0083] In addition, there is no reason to wash in the pretreatment process, and during the feeding process, the transport conveyor only needs to be dehydrated to the extent that it does not interfere with the transport, and the selection process only needs to remove inorganic substances such as metals, stones, and glass, and the crushing process is necessary due to the problem of transport and feeding to the reactor, but the reactor with the moisture content control function like the present invention has the advantage of a simple pretreatment process and a simple posttreatment process, thereby reducing the initial investment cost and operating expenses.

[0084] On the one hand, the water treatment facility does not have a washing process, but only generates as much as the amount of water supplied to the S / B and the inherent moisture of the reactants minus the moisture content control rate (%) of the final discharge stage, so the amount of wastewater is small, but a high-concentration water treatment facility is required for the wastewater re-condensed at high temperatures, and the steam discharged from the reactor is condensed in a condenser with a sludge discharge function as waste steam containing all kinds of compounds and connected to the water treatment facility, but an atmospheric environment facility is required to remove the white smoke discharged to the top of the condenser.

[0085] Figure 1 is a representative diagram showing the flow of the entire process of the present invention.

[0086] Figure 2 is a drawing showing the overall layout of the reactor and the detailed components and methods for supplying saturated steam and superheated steam.

[0087] Figure 3 is a front view of the reactor, showing the hatch cover, flash tank, solid raw material recovery device, steam discharge pipe, and steam discharge pipe for controlling moisture content.

[0088] Figures 4 and 5 are side views of the reactor showing the arrangement of the stirrer, the rotational force supply device, and the solid raw material recovery device.

[0089] Figure 6 is a detailed drawing of a biosolids raw material recovery device and a sludge condensate recovery device.

[0090] Figure 7 is a detailed drawing of the hatch cover.

[0091] Figure 8 is a detailed drawing of the flash tank.

[0092] Figure 9 is a detailed drawing of the reactor steam discharge pipe and condensate discharge pipe.

[0093] Figures 10 to 17 are flow charts of the drive control unit.

[0094] Figure 18 is an example of a slide-type solid material discharge cover for use with a hatch cover and a detailed description of a reactor stirrer rotational power supply device.

[0095]

[0096] In the present invention, decomposition is a process in which a substance is broken down into simpler substances, and hydrolysis is a process in which a substance is broken down by reacting with water. Just as soap quickly dissolves in hot water, in order for hydrolysis to occur, energy is required to break the bonds of the substance in addition to water. Using high-temperature steam heat is called subcritical hydrolysis.

[0097] The characteristics of hydrolysis are that when waste is put into a sealed container (reactor) and saturated steam is supplied, the inherent moisture content of the waste reacts with the saturated steam, breaking the bonds between the atoms or molecules of the waste and decomposing it, and the high molecular weight waste is decomposed into low molecular weight substances through the ionization reaction by the hydroxide ions (OH-) and hydrogen ions (H+) of water, and most of the volatile organic compounds (VOCs) are absorbed and decomposed during the hydrolysis stage, killing harmful bacteria and microorganisms, enabling eco-friendly treatment, and the rapid decomposition by steam discharge allows for the production and recycling of bio-solid raw materials (BIO-SRM) in the form of particles through the expansion and decomposition effect.

[0098] The steam thermal hydrolysis of the present invention includes a process of hydrolysis with saturated steam, thermal decomposition with superheated steam, and moisture content control, and can be called steam & thermal hydrolysis.

[0099] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0100] Figure 1 is a representative diagram showing a step-by-step flow chart of a reactor, and is composed of a steam thermal hydrolysis preparation step, a reactant input and mixing step, a saturated steam hydrolysis step, a set temperature maintenance step during hydrolysis operation, a saturated steam discharge step, a condensate discharge step, a superheated steam primary moisture content adjustment step, a superheated steam thermal decomposition step, a set temperature maintenance step during thermal decomposition operation, a secondary moisture content adjustment step, a superheated steam rapid discharge step, a reactant addition moisture content adjustment step, an outlet sludge condensate discharge step, and a biosolid raw material recovery step.

[0101] Referring to Figure 2, the configuration of the steam thermal hydrolysis reactor and the arrangement of the surrounding equipment are illustrated, and the flow of saturated steam and the flow of superheated steam are illustrated, and the condensate pipe at the bottom of the reactor is provided with a gradient of about 5 / 100 to allow the condensate to flow into the flash tank.

[0102] In addition, the condenser (2000), water treatment facilities, boilers, etc., which do not have a detailed description, are reactor auxiliary facilities and are only used for the purpose described in the present invention.

[0103] In FIGS. 2 and 3, a saturated steam supply valve (CVG-3, 7) and a steam discharge valve (CVB-3, 4) are installed at the rear end of the water content control pipe (140) and the steam discharge pipe (160) at the top of the reactor. When discharging steam, the steam supply valve is closed and the discharge valve is opened to discharge steam. Conversely, when supplying saturated steam, the discharge valve is closed and the supply valve is opened to supply saturated steam while washing the reactant leakage prevention net (“E”).

[0104] Figures 4 and 5 are side views of the reactor, showing the shape of the stirrer and the rotational force supply device, and a reactant injection valve (CVB-1), a steam discharge pipe (140) for controlling the moisture content, a steam discharge pipe (160), a pressure sensor ((110), and a washing pipe (141) are installed on the upper part of the reactor, a saturated steam supply pipe (CVG-1), a superheated steam supply pipe (CVG-2), a humidity sensor (120), and a washing steam injection part (CVG-9, 10, 11, 12, 13, 14) are installed on the upper part of the reactor, a condensate discharge pipe (192) is arranged on both sides on the lower part of the reactor, a solid raw material discharge pipe (191) is arranged in the center of the reactor, and a hatch cover (700)), a condensate discharge pipe (193), and a washing steam supply pipe (142) are installed inside the discharge pipe (191), and a solid raw material A solid raw material discharge valve (CVB-2) is placed at the bottom of the discharge pipe (191).

[0105] In addition, condensate discharge valves CVB-6, 9, 10 and steam supply valves CVG-4, 5, 6 are installed in condensate discharge pipes 192 and 193, and at the ends, a flash tank steam supply valve CVG-18, a reactor-floating superheated steam supply valve CVG-22 and a flash tank condensate inlet valve CVB-12 are installed.

[0106] “B” of FIG. 4 is a rotational power supply device of the stirrer, and a controller, an inverter, and a position sensor are installed on the driving motor, and according to the measured value of torque (torque: kgf.m), referring to VIEW “B” of FIG. 11, the initial RPM starts operation at 0 to 5 RPM, is 5 RPM at the time of input, is adjusted to 5 to 10 RPM during hydrolysis, is controlled to 5 RPM during steam discharge, is controlled to 5 to 15 RPM during superheated steam decomposition, is controlled to 5 RPM during superheated steam discharge, is controlled to 5 to 20 RPM during moisture content adjustment, and is controlled to 5 RPM when solids are discharged. VIEW “A” is a hatch cover, which is explained in detail in the drawing.

[0107] “C” in Fig. 5 is a humidity sensor, which is composed of a detector for detecting temperature and humidity, a converter, and an operator, and transmits the derived humidity to the driving control unit to be used in the moisture content control step.

[0108] FIG. 6 shows a solid raw material recovery cart (610) installed at the bottom of the discharge valve CVB-2 as a bio-solid raw material recovery device (600) at the bottom of the reactor, in which a rotational force supply device (612), a sludge recovery tank (620), and a solid raw material transfer device (630) are arranged in a row, and the sludge recovery tank has a structure in which a sludge recovery net 622) is installed at the top to filter sludge and condensate is discharged to the tank at the bottom, and the solid raw material transfer device is composed of a solid raw material transfer conveyor (650) and a conveyor rotational force supply device (640).

[0109] FIG. 7 is a detailed view of a hatch cover, showing the shape of the hatch cover and the process of opening and closing the hatch cover, and showing a driving device that rotates only 90°, and is installed in a solid raw material discharge pipe (191) at the bottom of a reactor, and is used for the purposes of condensate discharge, floating steam supply, and solid raw material discharge, and the hatch cover is provided with a hole (712) for condensate discharge and floating steam supply, a reactant discharge prevention cover (711) is installed to prevent discharge of reactants, and is a hatch cover having a structure that forms a flow path hole (713) to guide condensate or steam.

[0110] The flash tank of Fig. 8 is a sealed tank whose pressure is the same as that of the reactor, and is provided with a safety valve (210), a condensate inlet pipe (201), a flash vapor outlet (202), a condensate outlet (204), a condensate outlet (205) in the sludge discharge pipe (206) at the bottom, and a sludge filter (207) installed inside to filter out sludge in the discharged condensate and discharge only the condensate. A shut-off valve CVB-12 is installed in the condensate inlet pipe (201) and is connected to the condensate discharge pipe (190) of the reactor to recover the condensate of the reactor. The sludge filter is fixed with a flange at the bottom to enable assembly and disassembly.

[0111] The above flash tank (F / T) is equipped with a guide radar level gauge to automatically discharge condensate during reactor operation. Referring to Fig. 10-(5), when the condensate reaches the high level point “A,” the condensate inlet valve (CVB-6,9,10) is closed, the flash steam discharge valve CVB-11 is opened to discharge the condensate, and when the low level point “B,” the discharge valve CVB-11 is closed, the flash tank steam supply valve (CVG-18) is opened to raise the pressure to the set pressure (P5≥△P4), the steam supply valve is closed, and the condensate inlet valve (CVB-6,9,10) is opened to terminate the condensate discharge of the F / T.

[0112] VIEW “E” of FIG. 9 is installed at the inlet of the steam discharge pipe to prevent discharge of reactants when steam is discharged from the reactor. The discharged steam passes through a steam flow hole and a flow hole perforated at about 5 mesh in the steam discharge pipe, and is installed in connection with an expansion joint for convenient disassembly and assembly for cleaning or replacement of the mesh to prevent leakage of reactants.

[0113] VIEW “F” of FIG. 9 is a condensate discharge pipe (CVB-6, 9, 10) installed at the bottom of the reactor for condensate discharge, steam supply, and steam supply for washing. A reactant discharge prevention cover (195) is installed at the condensate inlet to prevent discharge of reactants, and the top of the condensate discharge pipe is blocked, and a condensate discharge flow path hole (196) is formed on the side so that condensate flows into the space between the outer condensate pipe (199) and the condensate discharge pipe (190) and flows into the flow path hole (198) of the perforated inner condensate pipe (197). When supplying steam, the steam is supplied to the reactor while washing the discharge pipe and flow path hole.

[0114] Therefore, depending on the purpose of use, the condensate discharge and steam supply are combined to provide washing and floating steam.

[0115] Meanwhile, since the reactor is operated at high temperature and high pressure, the maximum commercial operating pressure is 2 MPa in Fig. 10-(5), so the operating pressure of the safety valve is set to 2.3 MPa, and when the reactor pressure reaches 2.1 MPa, the steam supply valve is closed, and when the pressure rises further to 2.2 MPa, the steam discharge valve is opened, and when the pressure of the reactor is adjusted to the set pressure, the discharge valve is closed, and after analyzing the cause, measures are taken, and if no abnormality is found, the operation is restarted.

[0116] Figures 10 to 17 are flow charts of a drive control unit, explaining a specific control method of the present invention.

[0117] Referring to Fig. 10, the main controller (MC / T) is turned ON, the steam boiler (S / B) is raised to the operating set temperature (△T1), the main steam valve (CVG-20) is opened to send steam to the steam distributor (SD), and when the set temperature △T2 is reached, the steam supply valve CVG-19-1 is opened to supply saturated steam to the superheated steam boiler (SH / B), and when the pressure (P3) of the superheated steam boiler reaches the pressure set point △P3 (P3≥△P3:1.5MPa), the supply valve CVG-19-1 is closed and the superheated steam boiler (SH / B) is heated to the operating set temperature SH / B-△T3 (300℃).

[0118] The pressure, temperature, and humidity of the entire system are measured in the detection unit, and it is confirmed that P1, P2=△P and P3=△P3, and the drive control controller (D-CP) is turned on to start production of bio-solid raw materials.

[0119] At this time, all valves except CVG-20 are closed and operated in initialization mode.

[0120]

[0121] [Reactant (substance to be treated) input and mixing step]

[0122] Turn ON the drive motor (800) of the reactor stirrer and open the inlet valve CVB-1.

[0123] However, the mixer operates continuously until the work is completed.

[0124] The material to be processed is fed into the input hopper, and when feeding is complete, valve CVB-1 is closed.

[0125]

[0126] [Subcritical saturated steam hydrolysis stage]

[0127] Saturated steam is supplied by opening the condensate valves (CVB-6, 9, 10) and the steam supply valves (CVG-1, 3, 4, 5, 6, 7) to supply up to the reactor set pressure P4≥△P4 (2 MPa), closing the reactor top supply valves CVG-1, 3, 7, and opening the rising steam supply valves CVG-4, 5, 6 to maintain the reactor set pressure during operation.

[0128] The steam supply to the flash tank (F / T) is done by opening the supply valve CVG-18 and also opening the condensate inlet valve CVB-12. When the pressures of the reactor and the flash tank are equal, the condensate inlet valve is left open and the steam supply valve CVG-18 is closed so that the condensate generated during operation is automatically supplied to the flash tank.

[0129] As the reactants are decomposed during hydrolysis by saturated steam, heat is lost to the reactants, condensate is generated, and the pressure (△P4) of the reactor is maintained at the set pressure because the superheated steam supply valve (CVG-22) is open, but the temperature of the reactor drops below the set temperature.

[0130] Referring to Fig. 15, in order to maintain the set temperature (△T4) of the reactor during hydrolysis operation, the pressure (P4) and temperature (T4) of the reactor are measured, and when the reactor is at the set pressure of △P4 and the temperature (△T4) drops to the variable temperature set point of △T4 / 1 (190℃), the condensate generated in the reactor flows into the flash tank, but this is because there is a lot of wet steam whose temperature has dropped due to hydrolysis.

[0131] Therefore, to raise the temperature to the set temperature (△T4: 210℃), the reactor's buoyancy steam supply valve (CVG-4, 5, 6) is closed, the flash steam discharge valve CVB-11 of the F / T is opened to discharge the wet steam, and when the pressure of the reactor drops to the additional pressure set point △P5 = △P4 ≤ P4-1 (1.8 MPa), the discharge valve CVB-11, 12 of the flash tank is closed, the buoyancy steam supply valve (CVG-4, 5, 6) is opened, and when the set pressure △P ≥ △P4 (2 MPa), the buoyancy steam supply valve is closed, and the flash tank's condensate inlet valve (CVB-12) and the flash steam discharge valve (CVB-11) are repeatedly opened to finish discharging the wet steam of the reactor up to the set temperature △T4 (210℃), and the flash steam discharge valve (CVB-11) is closed, and the buoyancy steam supply valve and the flash tank condensate Open the inlet valve (CVB-12) to end the set temperature maintenance phase during operation.

[0132] In the above process, the inlet of the condensate discharge pipe may become clogged with sludge due to the discharge of wet steam from the reactor, but clogging can be prevented because the float steam is supplied and also serves as a cleaning device.

[0133] Meanwhile, the condensate discharge of F / T is automatically discharged according to the water level of the flash tank as described above with reference to Fig. 14.

[0134] Therefore, the temperature of the reactor can be controlled and condensate can be discharged even during hydrolysis.

[0135] In this case, when high-temperature, high-pressure condensate is discharged during operation, flash steam is generated due to the pressure difference.

[0136] In this way, the steam and condensate generated are sent from the flash tank to the condenser through the steam discharge pipe, and the condensate is connected to the water treatment facility.

[0137] When the hydrolysis time △Time-1 (40 minutes) is reached, hydrolysis by saturated steam is completed, and the floating steam supply valve (CVG-4, 5, 6) and the flash tank condensate inlet valve (CVB-12) are closed.

[0138] Saturated steam discharge from the reactor is accomplished by opening the steam discharge valve (CVB-3) to discharge all saturated steam from the reactor, and then closing the discharge valve CVG-3 to complete the discharge of saturated steam.

[0139] After the saturated steam discharge of the reactor is completed, open the flash steam discharge valve CVB-11 of the flash tank to discharge to the set pressure of △P5-1 (0 MPa), close CVB-11, open the condensate discharge valve CVB-5 of the flash tank to discharge all condensate in the flash tank, and close the discharge valve.

[0140] [Superheated steam pyrolysis and moisture content control stage]

[0141] Referring to Fig. 11, the object to be treated in the reactor may not be completely decomposed by steam thermal hydrolysis, and since the object to be treated has a high moisture content, in order to completely decompose and control the moisture content, check whether the superheated steam boiler is maintaining the pressure setpoint △P3 (1.5 MPa) and the temperature setpoint △T3 (300°C), and supply the superheated steam to the reactor by closing the flash tank condensate inlet valve (CVB-12), opening the condensate valves (CVB-6, 9, 10), opening the reactor body superheated steam supply valve (CVG-2) and the floating superheated steam supply valve (CVG-22) to supply the superheated steam up to the set pressure (P4 ≥ △P4-2: 1.5 MPa), closing the reactor body superheated steam supply valve (CVG-2), and leaving the floating superheated steam supply valve (CVG-22) open. Start adjusting the function rate.

[0142] The first moisture content control by superheated steam is performed by supplying buoyant steam, and when the moisture content measurement value (TH / S) of the reactor is higher than the first moisture content setting value (TH / S-1:70%), the moisture content control steam discharge valve (CVB-4) is opened to discharge the wet steam inside the reactor, and when the first moisture content setting value is reached, the moisture content control steam discharge valve is closed to terminate the first moisture content control.

[0143] At this time, when the pressure of SH / B drops to the additional pressure setting value △P3≥△P3-1 (1.45 MPa) due to the supply of superheated steam, the steam supply valve (CVG-19-1) of the distributor is opened to raise the pressure setting value △P3 (1.5 MPa), and then CVG-19-1 is closed repeatedly.

[0144] Additionally, the temperature of the superheated steam boiler (SH / B) is maintained at the superheated steam temperature setting value △T3 (300℃) by operating the SH / B.

[0145] Therefore, SH / B maintains the set pressure △P3 and the set temperature △T3.

[0146] In the above, when the temperature of the reactor drops to the variable temperature set point (△T4 / 5:△-40℃) for the first moisture content control process due to excessive discharge of wet steam, the moisture content control steam discharge valve (CVB-4) is closed, and when the temperature set point (△T4 / 4:△T-20℃) for the first moisture content control is reached, the moisture content control steam discharge valve (CVB-4) is repeatedly opened to terminate the first moisture content control.

[0147] After the first water content control is completed, thermal decomposition by superheated steam begins. Since the superheated steam supply valve (CVG-22) is open, the superheated steam supply valve (CVG-2) of the reactor body is opened, and when the reactor pressure reaches the thermal decomposition setting pressure (P4≥△P4-2:1.5MPa), the superheated steam supply valve (CVG-2) is closed, and thermal decomposition by superheated steam begins.

[0148] In order to maintain the set temperature (△T4 / 2:△T) of the reactor during thermal decomposition operation using superheated steam, referring to Fig. 16, the pressure (P4) and temperature (T4) of the reactor are measured, and the reactor maintains the set pressure of △P4-2 (1.5 MPa) by opening the steam supply valve (CVG-22), but when the temperature drops to the variable temperature set point of △T4 / 3, the moisture content control valve (CVB-4) is opened to discharge the wet steam, and after discharging the wet steam to the set temperature of △T4 / 2, the discharge valve CVB-4 is closed to maintain the set temperature during operation.

[0149] At this time, when the additional pressure setting value P4=△P4-5 (1.3 MPa) is reached due to excessive discharge of wet steam, the discharge valve (CVB-4) is closed, and when the pressure setting value P4≥△P4-2 (1.5 MPa) is reached, the steam discharge valve (CVB-4) for controlling the moisture content is repeatedly opened to maintain the reactor set temperature during operation.

[0150] Here, the reason why the temperature of the reactor is set to the initial temperature measurement value (△T) when the supply of superheated steam is completed even though superheated steam is supplied at 300℃ at 1.5MPa is examined is that not only is there a temperature difference depending on the specific weight and moisture content of the reactants, but also, since it is a heating process when superheated steam with a high temperature is supplied while there is saturated steam and saturated water in the reactor, only the dryness of the saturated steam increases according to the saturation state table and it is difficult to increase the temperature.

[0151] For example, as shown in the table above, when superheated steam is supplied at 2 MPa-300℃ with a moisture content of 70%, it only rises to 2 MPa-212℃ in the saturated steam table and turns into dry saturated steam, so only the dryness increases.

[0152] Therefore, since it is a pressure vessel as shown in the table below, unless the dryness (x) of the saturated steam is 1, the temperature increases proportionally according to the pressure and volume, so the temperature of the system is controlled by using the reactor temperature due to the superheated steam as the initial temperature measurement value (△T).

[0153] Table) PV diagram

[0154]

[0155] Therefore, since the temperature for thermal decomposition and 1st and 2nd moisture content control by superheated steam will be formed around 200℃, if the moisture content is controlled by the initial temperature measurement value (△T), the dryness (x) of the saturated steam increases, allowing for efficient moisture content control.

[0156] The thermal decomposition time by superheated steam is completed by the set value △Time-2 (15 minutes), and the secondary moisture content control of the reactor is performed by opening the moisture content control discharge valve (CVB-4) when the moisture content measurement value TH / S is higher than the set value △TH / S-2 (60%) to discharge wet steam until TH / S becomes the secondary moisture content set value △TH / S-2, and closing the discharge valve CVB-4 to end the primary moisture content control and thermal decomposition by superheated steam and the secondary moisture content control.

[0157] If the additional pressure drops to the set value (P4=△P4-5:1.3MPa) due to excessive discharge of wet steam during the secondary function rate control, the pressure of the reactor is controlled to be maintained in the same manner as the set temperature maintenance step during thermal decomposition operation.

[0158] After completing the thermal decomposition and the first and second function ratio adjustments, the superheated steam is discharged by closing the superheated steam supply valve (CVG-22) and opening the main steam discharge valve CVB-3 to rapidly reduce the pressure to △P-7 (0 MPa).

[0159] Referring to Fig. 12, from the third moisture content control step by superheated steam, there is no thermal decomposition process, and only the moisture content is controlled. The pressure of the reactor is zero because the steam discharge valve (CVB-3) is open, and when the pressure and temperature of SH / B are reset, the condensate inlet valve CVB-12 is closed, and the superheated steam supply valve CVG-22 is opened to discharge the wet steam of the reactor while supplying superheated steam, thereby continuously controlling the moisture content.

[0160] Therefore, the pressure of SH / B is reset to P3≥△P3-2 (0.3 MPa), the temperature is reset to T3≥△T3 / 1 (200℃), and when the pressure drops to the additional pressure setting value of △P3-3 (0.25 MPa) due to steam supply, the saturated steam supply valve CVG-19-2 is opened, raised to △P3-2 (0.3 MPa), and then CVG-19-2 is closed repeatedly.

[0161] Additionally, SH / B is turned ON-OFF to maintain the temperature of SH / B at the reset value of △T3 / 1 (200℃).

[0162] Then, when the moisture content setting value becomes △TH / S-3 (50%), the 3rd moisture content control is completed, the pressure and temperature of SH / B are reset to the 4th moisture content control setting value P3≥△P3-4 (0.3 MPa) and the temperature is reset to T3≥△T3 / 2 (160℃), and when the pressure of SH / B during operation drops to the additional pressure setting value △P3-5 (0.25 MPa), the saturated steam supply valve (CVG-19-2) of the distributor is opened, and when the setting pressure of SH / B becomes △P3-4, CVG-19-2 is closed, and this is repeated.

[0163] At this time, SH / B is turned ON / OFF to maintain the temperature of SH / B at the reset value T3≥△T3 / 2 (160℃).

[0164]

[0165] The fourth moisture content control is performed continuously, and when the moisture content control is completed to the moisture content setting value TH / S≤△TH / S-4 (40%), the steam supply valve CVG-22 is closed to terminate the steam thermal hydrolysis stage.

[0166] In this way, the reason for having a moisture content control step is to discharge moisture content in stages to quickly reach the set moisture content value, as it is difficult to control the set moisture content due to the moisture content generated in the reactor during the superheated steam reaction.

[0167] In addition, the reason for controlling the set pressure and temperature of the reactor step by step is to control the moisture content, so as to reduce the consumption of superheated steam due to the discharge of high-temperature and high-pressure wet steam, and to control the temperature and pressure of superheated steam in proportion to the pressure and temperature of saturated steam. In addition, when the moisture content decreases, there is also the purpose of preventing spontaneous combustion when a solid raw material with a low flash point is discharged.

[0168] Meanwhile, as shown in VIEW “B” of Fig. 18, the RPM of the stirrer is operated at the maximum value of 20 RPM in the moisture content control stage to ensure smooth discharge of wet steam.

[0169] After going through all the processes as described above, the object to be treated is decomposed, and the moisture content is adjusted to the final target setting value of △TH / S-4 (40%).

[0170] Therefore, depending on the characteristics and intended use of the waste, the moisture content can be adjusted to a moisture content suitable for the operation of the pellet molding machine, so that the produced biosolid raw material can be easily discharged, the means of transportation is easy during the discharge process, and the pellet molding process can be continued without the condensate separation step, dehydration step, and drying step after discharge, so there is an advantage in that the subsequent process for producing biosolid raw materials can be miniaturized.

[0171] The steam thermal hydrolysis process is explained by dividing it into a hydrolysis step using subcritical saturated steam and a thermal decomposition step using superheated steam. However, depending on the object to be treated, in the case of food waste or animal waste with a very high moisture content of 90% or more, hydrolysis can be achieved using only the superheated steam decomposition process, so biosolid raw materials can be produced by adjusting the superheated steam decomposition reaction time (△Time) and the moisture content setting value.

[0172] In addition, the thermal hydrolysis step may be completed by the first thermal decomposition and moisture content control process depending on the target material to be treated or, in the case of large-scale waste treatment, to shorten the reaction decomposition time.

[0173] [Biosolid raw material discharge stage]

[0174] Referring to Fig. 13, in order to discharge the produced biosolid raw material, the rotational power supply device (612) of the discharge movable cart (610) is operated to move the sludge condensate recovery tank (620) to the discharge port of the reactor, and since sludge and condensate are accumulated in the discharge side discharge pipe (191), the discharge port valve CVB-2 is opened to discharge the sludge and condensate into the recovery tank (621).

[0175] When discharge is complete, the mobile cart is driven to move the bio-solid raw material transport device (630) to the discharge port, the conveyor is started, and the hatch cover (700) of the reactor is opened to discharge all bio-solid raw materials.

[0176] At this time, partially open the inlet valve CVB-1 to allow air to flow in smoothly.

[0177] When the discharge of bio-solid raw material is completed, close the hatch cover (710) and discharge valve CVB-2, close the input side valve CVB-1 to complete all processes and return to the initialization mode to restart the steam thermal hydrolysis process, or stop the agitator of the reactor, perform the washing process of the reactor, and then turn the SYSTEM SHUT DOWN.

[0178] [Washing Step]

[0179] When the biosolid raw material production process is completed and operation is restarted, a separate cleaning process can be omitted. However, when the reactor is shut down for a long period of time (at the end of a day's work), it is advisable to clean and stop the reactor and auxiliary equipment as tar and sludge may adhere to them.

[0180] Washing of the reactor is done by considering the amount of steam supplied and by washing each part separately to prevent them from colliding with each other during washing.

[0181] The cleaning process is briefly explained with reference to Figure 17. The flash tank cleaning is divided into discharge side cleaning, inlet side cleaning, sludge discharge pipe cleaning, and condensate discharge pipe cleaning, and is divided into condensate pipe cleaning, discharge pipe cleaning, main steam discharge pipe cleaning, and moisture content control pipe cleaning.

[0182] When explaining the washing of the reactor, operate the agitator, operate the discharge cart, place the sludge and condensate recovery tank at the reactor discharge outlet, open the discharge valves CVB-2, 3 and the hatch cover (H / C), and wash each part.

[0183] For cleaning the inlet, close the steam supply valve CVG-15 after opening and cleaning, for cleaning the left side of the reactor, close CVG-12, 13, and 14 after opening and cleaning, and for cleaning the right side of the reactor, close CVG-9, 10, and 11 after opening and cleaning.

[0184] When the reactor cleaning is completed, the agitator is stopped, the discharge valves CVB-2, 3 and H / C are closed, the discharge cart is moved to clean the sludge recovery net of the sludge recovery tank, and all cleaning is completed.

[0185] Fig. 18 is an example of a slide-type reactor cover for another method of installing a hatch cover. A slide-type cover can also be installed inside the reactor to prevent reactants from flowing into the discharge valve (CVB-2).

[0186] As described above, the present invention has been illustrated and described with respect to specific embodiments so that it can be comprehensively applied to all organic wastes. However, depending on the object to be treated, a person of ordinary skill in the art may modify and change the present invention in various ways without departing from the spirit and scope of the present invention described in the claims. However, it should be clearly stated that all such modifications and variations are included within the scope of the rights of the present invention.

[0187]

[0188] 100: Reactor

[0189] 200: Flash tank (F / T) for condensate recovery

[0190] 300: Steam distributor (S / D)

[0191] 400: Main steam boiler (S / B)

[0192] 500: Superheated Steam Boiler (SH / B)

[0193] 600: Biosolids raw material recovery device

[0194] 700: Hatch cover (H / C)

[0195] 800: Reactor stirrer rotation power supply device

[0196] 900: Function rate control system

[0197] 1000: Main Controller (M-CT)

[0198] 1001: Driving control controller (D-CP)

[0199] 2000: Condenser

[0200] Reactor (100)

[0201] 110: Pressure sensor (P / S)

[0202] 120: Temperature and humidity sensor (TH / S)

[0203] 140: Function rate control tube

[0204] 141: Steam supply pipe for input side cleaning

[0205] 142: Steam supply pipe for H / C cleaning

[0206] 150: Reactor stirrer shaft

[0207] 151: Stirring blade

[0208] 152: Stirrer blade shaft

[0209] 153: Grand Packing

[0210] 154: Grease inlet

[0211] 155: Bush

[0212] 160: Steam exhaust pipe

[0213] 170: Steam supply pipe for reactor cleaning

[0214] 171: Main steam supply pipe

[0215] 172: Superheated steam supply pipe

[0216] 173: Rider separator

[0217] 174: Pressure reducing valve

[0218] 180: Mounting bracket

[0219] 190: Reactor condensate discharge pipe

[0220] 191: Solid raw material discharge pipe

[0221] 192: Reactor condensate discharge pipe & steam supply pipe

[0222] 193: Condensate discharge pipe of solid raw material discharge pipe

[0223] 194: Steam exhaust outlet reactant discharge prevention net

[0224] 195: Cover to prevent discharge of reactants

[0225] 196: Euro Hall

[0226] 197: Internal condensate pipe

[0227] 198: Condensate flow hole

[0228] 199: External pipe for condensate flow

[0229] Flash Tank (200)

[0230] 201: Condensate inlet pipe

[0231] 202: Flash steam exhaust pipe

[0232] 204: Condensate drain pipe

[0233] 205: Sludge condensate discharge pipe

[0234] 206: Sludge discharge pipe

[0235] 207: Sludge filter net

[0236] 208: Steam supply pipe for washing

[0237] 209: Mounting bracket

[0238] 210: Safety valve

[0239] 211: Installation structure

[0240] 220: Water level gauge (W / G)

[0241] Biosolid raw material recovery device (600)

[0242] 610: Solid Raw Material Recovery Cart

[0243] 612: Bogie rotation power supply device

[0244] 620: Condensate recovery tank

[0245] 621: Sludge recovery tank

[0246] 622: Primary sludge filter

[0247] 623: Secondary sludge filter

[0248] 624: Javara recovery pipe for condensate discharge

[0249] 625: Sludge discharge pipe

[0250] 630: Solid raw material conveying device

[0251] 631: Solid material discharge hopper

[0252] 640: Conveyor rotation power supply device

[0253] 650: Solid material transfer conveyor

[0254] Hatch cover (700)

[0255] 710: Rotational power supply device

[0256] 711: Reactant discharge prevention cover

[0257] 712: Condensate flow hole

[0258] 713: Hole for condensate discharge and steam supply

[0259] Electric Ball Valve: CVB

[0260] 1) CVB-1: Inlet valve

[0261] 2) CVB-2: Discharge valve

[0262] 3) CVB-3: Valve for steam discharge

[0263] 4) CVB-4: Steam discharge valve for controlling moisture content

[0264] 5) CVB-5: Valve for draining condensate from flash tank

[0265] 6) CVB-6,9,10: Valve for draining condensate from the discharge pipe

[0266] 7) CVB-8: Valve for discharging sludge condensate from flash tank

[0267] 8) CVB-11: Valve for flash tank vapor discharge

[0268] 9) CVB-12: Flash tank condensate inlet valve

[0269] Electric glow valve

[0270] 1) CVG-1: Main steam supply line electric glow valve

[0271] 2) CVG-2: Superheated steam supply line electric glow valve

[0272] 3) CVG-3: Valve for cleaning the water content control pipe and supplying steam

[0273] 4) CVG-4: Valve for cleaning the reactor condensate discharge pipe and supplying the buoyant steam

[0274] (CVG-4, 5, 6)

[0275] 5) CVG-7: Valve for cleaning the wet steam discharge pipe and supplying steam

[0276] 6) CVG-8; Steam supply valve for hatch cover cleaning

[0277] 7) CVG-9: Steam supply valve for reactor cleaning (9.10.11.12.13.14)

[0278] 8) CVG-15: Steam supply electric valve for inlet side cleaning

[0279] 9) CVG-16: Steam supply valve for cleaning the flash tank steam discharge pipe

[0280] 10) CVG-17: Steam supply valve for cleaning the flash tank sludge discharge pipe

[0281] 11) CVG-18: Condensate drain cleaning and flash tank steam supply valve

[0282] 12) CVG-19-1: Primary saturated steam SH / B supply valve

[0283] 13) CVG-19-2: Secondary saturated steam SH / B supply valve

[0284] 14) CVG-20: Valve for supplying saturated steam to the main steam boiler

[0285] 15) CVG-21: Steam supply valve for cleaning the flash tank condensate discharge pipe

[0286] 16) CVG-22: Injury superheated steam supply valve

[0287] ball valve

[0288] 1) VB-1: Valve for draining condensate from the condenser

[0289] 2) VB-2: Valve for discharge of sludge from flash tank

[0290] 3) VB-3: Sludge discharge valve for sludge recovery tank

[0291] 4) VB-4: Boiler feed water valve

[0292] glow valve

[0293] 1) VG-1: Valve for boiler steam supply

[0294] 2) VG-2: Superheated steam boiler supply side valve

[0295] 3) VG-3: Superheated steam boiler inlet valve

[0296] 4) VG-4: Distributor main steam valve

[0297] 5) VG-5: Distributor superheated steam supply side valve

[0298] 6) VG-6: Distributor boiler side valve

[0299] 7) VG-7: Valve for distributor steam supply (7. 8. 9. 10. 11,12)

[0300] Temperature detection

[0301] 1) T1: Steam boiler temperature

[0302] 2) T2: Steam distributor temperature

[0303] 3) T3: Superheated steam boiler temperature

[0304] 4) T4: Reactor temperature

[0305] 5) T5: Flash tank temperature

[0306] Pressure detection

[0307] 1) P1: Steam boiler pressure

[0308] 2) P2: Steam distributor pressure

[0309] 3) P3: Superheated steam boiler pressure

[0310] 4) P4: Reactor pressure

[0311] 5) P5: Flash tank pressure

[0312] Pressure setpoint

[0313] 1) △P: Steam boiler pressure setting (2 MPa)

[0314] 2) △P4: Reactor saturated steam pressure setting (2 MPa)

[0315] 3) △P4-1: Reactor saturated steam additional pressure setting (1.8 MPa)

[0316] 4) △P4-2: Reactor superheated steam pressure setting (1.5 MPa)

[0317] 5) △P4-3: Reactor saturated steam discharge completion pressure setting (0 MPa)

[0318] 6) △P4-5: Reactor superheated steam additional pressure setting (1.3 MPa)

[0319] 7) △P-7: Reactor superheated steam discharge completion pressure setting (0 MPa)

[0320] 8) △P3: Superheated steam boiler pressure setting (1.5 MPa)

[0321] 9) △P3-1: Superheated steam boiler primary additional pressure setting (1.45 MPa)

[0322] 10) △P3-2: Superheated steam boiler secondary pressure setting (0.3 MPa)

[0323] 11) △P3-3: Superheated steam boiler secondary additional pressure setting (0.25 MPa)

[0324] 12) △P5-1: Pressure setting for flash tank condensate discharge (0 MPa)

[0325] Temperature setpoint

[0326] 1) △T1: Steam boiler temperature setting (2MPa / 212℃)

[0327] 2) △T2: Distributor temperature setting (210℃)

[0328] 3) △T3: Superheated steam boiler primary temperature setting (300℃)

[0329] 4) △T3 / 1: Superheated steam boiler secondary temperature setting (200℃)

[0330] 5) △T3 / 2: Superheated steam boiler 3rd temperature setting (160℃)

[0331] 6) △T4: Reactor hydrolysis temperature setting (210℃)

[0332] 7) △T4 / 1: Reactor hydrolysis primary variable temperature setting (190℃)

[0333] 8) △T4 / 2: Initial temperature measurement value of superheated steam at 1.5 MPa (△T℃)

[0334] 9) △T4 / 3: Variable temperature setting of superheated steam at 1.5 MPa (△T-20℃)

[0335] 10) △T4 / 4: Temperature setting for controlling the 1st and 2nd reactor function ratios (△T-20℃)

[0336] 11) △T4 / 5: Variable temperature setting for controlling the 1st and 2nd reactor function ratios (△T-40℃)

[0337]

[0338] Function rate setting value

[0339] 1) TH / S: Function ratio measurement value

[0340] 2) △TH / S-1: 1st function rate setting value (70%)

[0341] 3) △TH / S-2: Secondary function rate setting (60%)

[0342] 4) △TH / S-3: 3rd function rate setting (50%)

[0343] 5) △TH / S-4: 4th function rate setting (40%)

[0344] Time setting value

[0345] 1) △Time-1: Saturated steam hydrolysis time setting (40 minutes)

[0346] 2) △Time-2: Superheated steam pyrolysis time setting (15 minutes)

Claims

1. In a steam thermal hydrolysis reactor having a moisture content control function for environmentally friendly treatment of organic waste through steam thermal hydrolysis and production of bio-solid raw material (BIO-SRM) as a by-product composed of the organic waste, (a) a step of raising the steam boiler (S / B) to the set temperature and pressure, opening the steam supply valve (CVG-20) to send saturated steam to a steam distributor, opening the supply valve (CVG-19) of the steam distributor to send saturated steam to a superheated steam boiler (SH / B) at the set pressure, closing the supply valve (CVG-19), operating the superheated steam boiler (SH / B) to raise the superheated steam to the set temperature, and preparing steam thermal hydrolysis; (b) A step of introducing and mixing reactants by operating the rotational power supply device (800) of the stirrer of the reactor (100), opening the inlet valve (CVB-1), introducing the waste to be treated into the reactor, and closing the inlet valve (CVB-1); (c) In order to supply the saturated steam of the steam distributor to the reactor (100) and the flash tank (200), the condensate discharge valve (CVB-6,9,10) of the reactor (100) and the condensate inlet valve (CVB-12) of the flash tank (200) are opened, the reactor steam supply valve (CVG-1,3,7) and the rising steam supply valve (CVG-4,5,6) of the condensate discharge pipe and the steam supply valve (CVG-18) of the flash tank (200) are opened, and when the saturated steam reaches the set pressure (P4=P5≥△P4) of the reactor (100) and the flash tank (200), the main body steam supply valve (CVG-1,3,7) of the reactor (100) and the steam supply valve (CVG-18) of the flash tank (200) are closed, and the condensate The valves (CVB-6,9,10,12) and the steam supply valve (CVG-4,5,6) are kept open so that the reactor (100) and the flash tank (200) maintain the same pressure, and the hydrolysis step using saturated steam for reaction decomposition; (d) A step of maintaining the reactor set temperature during hydrolysis operation, in which, as waste is decomposed in the hydrolysis step, the temperature of the reactants in the reactor (100) is lowered by losing temperature to the wet steam and the condensate generated, the wet steam is discharged from the reactor (100), a flash tank (200) is installed to automatically introduce the condensate, and the introduced condensate is discharged to maintain the set temperature; (e) a step of rapidly discharging the vapor of the reactor (100) when hydrolysis is completed, and a step of discharging the flash vapor and condensate generated during the hydrolysis operation from the flash tank (200), wherein the flash vapor is discharged by opening the flash vapor discharge valve (CVB-11) and supplied to the condenser (2000) having a sludge discharge function, and the condensate, the temperature and pressure of which are lowered by the discharge of the flash vapor, is discharged by opening the condensate discharge valve (CVB-5) and supplied to the water treatment facility, thereby discharging the saturated vapor and condensate separately; (f) a step of controlling the primary moisture content by supplying superheated steam from the superheated steam boiler (SH / B) to the reactor (100) to completely decompose the waste to be processed and control the moisture content, and a step of thermal decomposition by superheated steam that decomposes the waste, and a step of rapidly discharging the superheated steam of the reactor (100) when thermal decomposition is completed; (g) a steam thermal hydrolysis step including a step of opening a moisture content control valve (CVB-4) to discharge wet steam to maintain the set temperature when the temperature drops below the set temperature during thermal decomposition operation in step (f), and a step of controlling the moisture content step by step when moisture content control is required; (h) A step in which a hatch cover (700) is installed at the discharge port of the reactor (100) so that the sludge and condensate generated in the hydrolysis step and the thermal decomposition and moisture content control step can be discharged between the discharge pipe and the discharge valve at the bottom of the reactor (100), thereby allowing the sludge and condensate to be recovered without discharging biosolid raw material even when the solid raw material discharge valve (CVB-2) is opened; (i) a step of installing a solid raw material recovery device (600), moving the cart of the recovery device to the discharge port, and opening the hatch cover (700) to recover the produced bio-solid raw material; (j) A step for controlling the discharge of wet steam and the adjustment of the moisture content by installing a steam discharge pipe (160) and a separate steam discharge pipe (140) for controlling the moisture content and the adjustment of the moisture content to maintain the set temperature during operation by connecting the steam discharge pipe (160) to the steam discharge port in a bypass form and introducing it into the condenser (2000); A steam thermal hydrolysis reactor having a water content control function for producing biosolid raw materials, characterized by including a.

2. In paragraph 1, Step (d) above A steam thermal hydrolysis reactor with a moisture content control function for producing biosolid raw materials characterized by maintaining the set temperature during operation by discharging the wet steam with the dropped temperature and the generated condensate to prevent the temperature from dropping below the set temperature during the hydrolysis step using saturated steam, whereby the reactor maintains the set pressure, but the temperature does not drop below the set temperature, so that hydrolysis is not decomposed at the desired temperature, the reaction time is prolonged, and the reactants absorb condensate and only the moisture content increases.

3. In paragraph 1, The method for maintaining the set temperature during operation in step (d) above is as follows: When the temperature (△T4) of the reactor during operation falls below the additional temperature set point (△T4 / 1), the steam discharge valve (CVG-4,5,6) and the condensate inlet valve (CVB-12) are closed to discharge the wet steam, the steam discharge valve (CVB-4) for controlling the moisture content is opened to discharge the wet steam in the reactor, and when the pressure of the reactor falls to the additional pressure set point (△P4-1), the steam discharge valve (CVB-4) for controlling the moisture content is closed and the steam supply valve (CVG-4,5,6) is opened to raise the reactor to the set pressure (△P4), and then the steam supply valve is closed again, and the steam discharge valve (CVB-4) for controlling the moisture content is opened to discharge the wet steam. This process is repeated to raise the temperature to the set temperature (△T4), and then the steam discharge valve (CVB-4) is closed, and the steam supply valve (CVG-4,5,6) and the flash tank condensate inlet valve are closed. A steam thermal hydrolysis reactor having a moisture content control function for producing biosolid raw materials, characterized by further performing a step of opening (CVB-12) to maintain the reactor set temperature during operation.

4. In paragraph 1, In the above step (d), The above flash tank (200) is installed at the bottom of the reactor, and only the condensate generated by maintaining the same pressure as the reactor flows into the flash tank, and the flash tank has a structure capable of discharging the condensate generated in the hydrolysis stage, and is equipped with a condensate inlet pipe (201), a flash steam discharge pipe (202), a condensate discharge pipe (204), a sludge condensate discharge pipe (205) and a sludge discharge pipe (206) at the bottom, and a steam thermal hydrolysis reactor with a moisture content control function for producing biosolid raw materials, characterized by a flash tank having a function of automatically discharging the condensate by installing a water level gauge (220), a sludge filter net (207) installed inside, and a detachable structure for cleaning.

5. In paragraph 1, Step (d) above A steam thermal hydrolysis reactor with a moisture content control function for producing biosolid raw materials, characterized in that when the water level gauge (W / G) reaches the high point “A,” the condensate valve (CVB-6,9,10) is closed, the flash vapor discharge valve (CVB-11) is opened to discharge the flash vapor to the low point “B,” then the flash vapor discharge valve is closed, the flash tank vapor supply valve (CVG-18) is opened to raise the pressure to the set pressure (P5≥△P4), then the steam supply valve (CVG-18) is closed, and the condensate inlet valve (CVB-6,9,10) is opened to discharge the condensate in the flash tank.

6. In paragraph 1, Step (e) above, (e1) A saturated steam discharge step in which the saturated steam is discharged by opening the reactor steam discharge valve (CVB-3) after closing the steam supply valve (CVG-4,5,6) and the flash tank condensate inlet valve (CVB-12), and then closing the steam discharge valve (CVB-3); (e2) After the steam is discharged, the condensate in the flash tank is discharged by opening the flash steam discharge valve (CVB-11) to discharge all the flash steam, closing the discharge valve, and opening the condensate discharge valve (CVB-5) to discharge the condensate, which is the hydrolysis step using saturated steam; A steam thermal hydrolysis reactor having a water content control function for producing biosolid raw materials, characterized by including a.

7. In paragraph 1, Step (f) above, A steam thermal hydrolysis reactor with a moisture content control function for producing biosolid raw materials, characterized in that it includes a step of maintaining a set temperature during thermal decomposition operation and a step of discharging superheated steam, in which thermal decomposition and moisture content control processes are carried out in parallel in stages to achieve complete decomposition of waste and control the moisture content after hydrolysis by saturated steam.

8. In paragraph 7, Step (f) above, (f1) Hydrolysis by saturated steam is carried out under high pressure, but in order to control thermal decomposition and moisture content by superheated steam, the superheated steam boiler receives saturated steam from the steam boiler and raises the temperature of the saturated steam to produce superheated steam. Therefore, the main purpose is the superheated steam temperature rather than the pressure. Therefore, the steam boiler (S / B) is set to always maintain the set pressure (△P: 2 MPa) and temperature (△T1: 212℃) to enable a continuous process, and a control device is provided to supply saturated steam only at the set pressure (△P3: 1.5 MPa, △P3-2: 0.3 MPa) of the superheated steam boiler from the saturated steam distributor so that the efficiency of the superheated steam boiler (SH / B) is optimized by comparing the superheated steam temperature and the saturated steam temperature, and the superheated steam boiler is operated at the set temperature (△P3=△T3: 300℃, △P3-2=T3 / 1: 200℃ and △T3 / 2: Step for maintaining the set pressure and set temperature of the superheated steam boiler by raising it to 160℃; (f2) The first moisture content control step by superheated steam is to open the reactor condensate valve (CVB?6,9,10) while maintaining the set pressure and temperature (△P3:1.5MPa, △T3:300℃) of the superheated steam boiler, open the reactor body superheated steam supply valve (CVG-2) and the flotation superheated steam supply valve (CVG-22) to supply superheated steam. When the reactor pressure reaches the set pressure (P4≥△P4-2:1.5MPa), the reactor body superheated steam supply valve (CVG-2) is closed, the flotation steam supply valve (CVG-22) is opened, and the moisture content measurement value (TH / S) of the reactor is measured. When the moisture content is higher than the first moisture content set value, △TH / S-1 (70%), the moisture content control steam discharge valve (CVB-4) is opened to discharge wet steam so that the moisture content reaches the first moisture content set value. Step of completing the first function ratio adjustment by closing the regulating steam discharge valve and preparing for pyrolysis; (f3) In the above first moisture content control step, the opening and closing of the moisture content control valve is performed by opening the moisture content control valve to discharge wet steam and measuring the initial temperature measurement value (△T) of the reactor at 1.5 MPa, closing the moisture content control valve (CVB-4) when the variable temperature set point for the first moisture content control (△T4 / 5 = △T-40℃), and repeatedly opening the moisture content control valve when the temperature set point for the first moisture content control (△T4 / 4 = △T-20℃) is reached to maintain the set temperature in the first moisture content control step; (f4) The above thermal decomposition step is a step in which the superheated steam supply valve (CVG-2, 22) is opened to raise the pressure to the set pressure (△P4-2: 1.5 MPa), the reactor body supply valve (CVG-2) is closed, the surface steam supply valve (CVG-22) is opened, and the reactor starts thermal decomposition and secondary moisture content control while maintaining the set pressure (P4≥△P4-2) and temperature (T4≥△T4 / 2); A steam thermal hydrolysis reactor having a water content control function for producing biosolid raw materials, characterized by including a.

9. In Article 8 The above step (f1) is, (f11) A steam thermal hydrolysis reactor with a moisture content control function for producing biosolid raw materials, characterized in that during the thermal decomposition process by superheated steam in the step of maintaining the set temperature during the above thermal decomposition operation, the pressure of the reactor is maintained at the set pressure (P4=△P4-2) by supplying superheated steam, but when the temperature falls below the variable temperature set point (△T4 / 3), the moisture content control valve (CVB-4) is opened to discharge wet steam, and when the reactor pressure falls below the superheated steam additional pressure set point (△P4-5:1.3 MPa), the moisture content control valve is closed, and when the superheated steam pressure set point (△P4-2:1.5 MPa) is reached, the moisture content control valve is repeatedly opened to obtain the initial temperature measurement value (△T4 / 2), and the step of maintaining the set temperature during operation is further performed.

10. In paragraph 8, The above step (f4) is, (f41) A step of opening the moisture content control valve (CVB-4) to discharge wet steam up to the moisture content set point (△TH / S-2:60%) after completion of thermal decomposition by superheated steam to control the second moisture content, and closing the moisture content control valve to complete the second moisture content control; and (f42) The above secondary moisture content control is a step of controlling the moisture content by the pressure of the reactor, and when the superheated steam additional pressure setting value (△P4-5:1.3MPa) is lowered due to excessive discharge of wet steam in the same manner as the function of maintaining the set temperature during thermal decomposition operation, the moisture content control valve (CVB-4) is closed to raise the pressure to the set pressure (△P4-2:1.5MPa), and then the moisture content control valve is repeatedly opened to complete the secondary moisture content control. (f43) Rapid depressurization step to close the superheated steam supply valve (CVG-22) and open the steam discharge valve (CVB-3) to discharge all superheated steam; A steam thermal hydrolysis reactor having a water content control function for producing biosolid raw materials, characterized by further performing the following.

11. In paragraph 10, After the above step (f43), (f44) The steam discharge valve (CVB-3) is open, the pressure of the reactor is zero, the pressure and temperature of the superheated steam boiler are reset to the third moisture content setting value (△P3-2: 0.3 MPa, △T3 / 1: 200℃), the surface-floating steam supply valve (CVG-22) is opened to supply surface-floating steam, discharge wet steam, and discharge up to the third moisture content setting value (△TH / S-3: 50%), so that there is no thermal decomposition and only the moisture content is controlled; (f45) When the pressure and temperature of SH / B are reset to the 4th moisture content setting value (△P3-2: 0.3 MPa, △T3 / 2: 160℃), the moisture content is controlled to the final moisture content setting value (△TH / S-4: 40%) by supplying the buoyant steam and discharging the wet steam, and the 4th moisture content control step is performed by closing the steam supply valve (CVG-22) to perform thermal decomposition by superheated steam and control the moisture content; A steam thermal hydrolysis reactor having a water content control function for producing biosolid raw materials, characterized by further performing the following.

12. In paragraph 1, Step (i) above (i1) The hatch cover (700) is installed at the lower discharge port of the reactor body and opens and closes only at 90° by a rotational power supply device (710), and has a structure in which a reaction product discharge prevention cover (711) and a condensate flow path hole (712) are provided in a condensate discharge and floating steam supply combined hole (713) so that condensate can be discharged separately from the condensate discharge pipe of the reactor, and a cleaning steam supply valve (CVG-8) is installed in the discharge pipe (191). A step of cleaning the hatch cover and the discharge pipe; (i2) A step of installing a bio-solid raw material recovery device (600) at the bottom of a bio-solid raw material discharge valve (CVB-2) at the bottom of a reactor, and arranging a sludge condensate recovery tank (620) and a bio-solid raw material transport device (630) in a row on a bio-solid raw material recovery cart (610), and when sludge and condensate are discharged by a cart rotation power supply device (612), the sludge condensate recovery tank is moved to the discharge port and the solid raw material discharge valve (CVB-2) is opened to recover sludge and condensate, and when bio-solid raw material is discharged, the bio-solid raw material transport device (630) is moved to the discharge port and the hatch cover (700) is opened to recover the solid raw material; (i3) The above bio-solid raw material transport device (630) is equipped with a transport conveyor (650) to recover the produced bio-solid raw material and transport it to a post-processing process, thereby performing the entire process of producing bio-solid raw material, thereby processing organic waste in an environmentally friendly manner and producing bio-solid raw material as a by-product; A steam thermal hydrolysis reactor having a water content control function for producing biosolid raw materials, characterized by including a.

Images