CN114890650A - Environment-friendly low-temperature sludge drying method capable of accurately judging endpoint - Google Patents
Environment-friendly low-temperature sludge drying method capable of accurately judging endpoint Download PDFInfo
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- CN114890650A CN114890650A CN202210603289.0A CN202210603289A CN114890650A CN 114890650 A CN114890650 A CN 114890650A CN 202210603289 A CN202210603289 A CN 202210603289A CN 114890650 A CN114890650 A CN 114890650A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention provides an environment-friendly sludge low-temperature drying method capable of accurately judging a terminal point, which is characterized in that a sludge low-temperature drying device is adopted to perform drying dehydration on sludge, and comprises an oven detachably connected with a sealing door, a water ring pump arranged outside the oven and used for vacuumizing the inside of the oven, and a circulating water tank arranged outside the oven and used for providing working liquid for the operation of the water ring pump; a heating device, a loadometer scale, a hopper and a stirring mechanism are arranged in the oven; the heating device is used for heating the inside of the drying oven and controlling the temperature in the drying oven, so that the moisture in the sludge in the hopper is changed into water vapor which is pumped away by the water ring pump; the weighbridge scale is arranged on the lower side in the oven and used for measuring and displaying the weight value of the hopper and the change condition of the hopper; the hopper is placed on the loadometer and used for containing sludge; the stirring mechanism is arranged in the hopper and is used for stirring sludge in the hopper. The invention has the advantages of less used equipment, less investment, simple operation, low running cost, environmental protection and accurate judgment of the terminal point.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a low-temperature sludge drying method which is environment-friendly and can accurately judge a terminal point.
Background
The harmless disposal of the sludge of the sewage treatment plant is a relatively troublesome problem faced by the current sewage treatment plant. The general desliming equipment for sewage treatment plants generally comprises: a belt type sludge dewatering machine, a stacked screw type sludge dewatering machine and a plate-and-frame filter press. The sludge has considerable water existing in the form of crystal water, so that the sludge is difficult to dehydrate, the water content of the sludge subjected to belt type dehydration and overlapped screw dehydration is about 80 percent, and the water content of the sludge subjected to plate and frame filter pressing can only reach about 60 percent. Because plate-and-frame filter pressing requires extra dosing or extra large pressure, belt dewatering has the advantages of investment saving, high efficiency, low operation cost and the like compared with plate-and-frame filter pressing, but is inferior in the aspect of harmless treatment of sludge.
At present, the most common mode of sludge harmless treatment is treatment by adopting a cement kiln or a thermal power plant cooperative mode, but generally, only sludge with the water content of 60 percent or less can be treated (or only desirably treated), and the subsequent harmless treatment approach of the sludge with the water content of 80 percent in a sewage treatment plant is greatly limited.
If a belt type dehydration mode with low cost and high efficiency is utilized to reduce the water content of the sludge to 80 percent and then the sludge is further dried to 60 percent or lower through an economic feasible mode, the method has good market prospect.
The technologies of further dehydrating and drying sludge include a high-temperature evaporation technology, a heat pump sludge low-temperature drying technology, a hydrothermal modification and deep dehydration technology and the like, and have the limitations of large investment, high operation cost and difficult waste gas treatment.
The vacuum distillation technology is a mature technology commonly used in the metallurgical industry, and can reduce the volatilization temperature of impurities or products by vacuumizing so as to achieve the purpose of product purification. The vacuum distillation technology is applied to sludge drying, so that the drying temperature can be reduced, and the drying efficiency can be improved.
In both high-temperature evaporation and vacuum distillation, the water in the sludge needs to be changed into steam to be volatilized from the sludge. And the odor (mainly ammonia gas, hydrogen sulfide and the like) and dust enter the gas phase transfer together with the water vapor, and the lower the drying temperature is, the lower the amount of the odor and the dust is. Therefore, in a general sludge drying process, a condensing tank is required to condense water vapor, and a deodorizing tower is required to treat waste gas.
Whether high-temperature evaporation or vacuum distillation is adopted, the terminal point needs to be accurately judged so as to finish the production process at the right time. If the water content of the sludge is too high to meet the requirements of subsequent harmless treatment or comprehensive utilization products, the harmless treatment cost is increased or the selling price of the comprehensive utilization products is reduced; if the drying is finished too late, the drying cost of the sludge is increased, and waste is caused. At present, the judgment of the sludge drying end point generally adopts an empirical time method, namely, after numerous times of groping, an optimal time is obtained, and the production process is ended when the time meets the empirical value. For insurance, the actual production is usually adjusted with a suitable delay, and the result is general overdrying, which increases the cost.
Disclosure of Invention
In order to solve the problems, the invention aims to provide the low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint, the method has the advantages of less equipment, less investment, simple operation, low operation cost, environmental friendliness and accurate endpoint judgment.
The purpose of the invention is realized by the following technical scheme:
the method is characterized in that a low-temperature sludge drying device is adopted to dehydrate and dry sludge, and the low-temperature sludge drying device comprises an oven detachably connected with a sealing door, a water ring pump arranged outside the oven and used for vacuumizing the interior of the oven, and a circulating water tank arranged outside the oven and used for providing working liquid for the operation of the water ring pump; a heating device, a loadometer scale, a hopper and a stirring mechanism are arranged in the oven; the heating device is used for heating the inside of the drying oven and controlling the temperature in the drying oven, so that water in sludge in the hopper is changed into water vapor which is pumped away by the water ring pump; the loadometer is arranged at the lower side in the oven and is used for measuring and displaying the weight value of the hopper and the change condition of the hopper; the hopper is placed on the loadometer scale and used for containing sludge; the stirring mechanism is arranged in the hopper and is used for stirring sludge in the hopper. The top of the oven is provided with an opening, and the sealing door is detachably connected to the top of the oven; the hopper and the stirring mechanism therein can be hoisted into or out of the oven to load and unload sludge.
The sludge low-temperature drying device is adopted to dry sludge and comprises the following steps:
s1, detecting the initial water content of the sludge to be dried.
S2, charging sludge to be dried into a hopper; hoisting the hopper filled with the sludge into the oven through a hoisting device, and placing the hopper on a loadometer scale; the sealing door is tightly locked and sealed on the top of the oven.
S3, starting a heating device to heat the oven; adding water into a circulating water tank, and starting a water ring pump to vacuumize the oven; and starting the stirring mechanism to stir the sludge in the hopper.
S4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; according to the weight value of the hopper and the change condition thereof measured and displayed by the loadometer, the sludge drying process can be judged; when the weight reduction value of the hopper reaches the weight of the water to be removed, the sludge drying end point is reached.
S5, stopping the heating device, the stirring mechanism and the water ring pump in sequence after the sludge drying end point is reached; deflating the oven to a flat pressure; disassembling the sealing door; and (4) lifting the hopper out of the oven, and discharging the dried sludge to finish drying a batch of sludge.
In another method of the invention, the side surface of the oven is provided with an opening, and the sealing door is detachably connected to the opening on the side surface of the oven; the hopper and the stirring mechanism therein can be pushed into or pulled out of the oven to load and unload sludge.
The sludge low-temperature drying device is adopted to dry sludge and comprises the following steps:
s1, detecting the initial water content of the sludge to be dried.
S2, charging sludge to be dried into a hopper; opening a sealing door, pushing the hopper filled with the sludge into the oven, and placing the hopper on the loadometer scale; and locking and sealing the sealing door on the side surface of the oven.
S3, starting a heating device to heat the oven; adding water into a circulating water tank, and starting a water ring pump to vacuumize the oven; and starting the stirring mechanism to stir the sludge in the hopper.
S4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; according to the weight value of the hopper and the change condition thereof measured and displayed by the loadometer, the sludge drying process can be judged; when the weight reduction value of the hopper reaches the weight of the water to be removed, the sludge drying end point is reached.
S5, after the sludge drying end point is reached, stopping the heating device, the stirring mechanism and the water ring pump in sequence; deflating the oven to a flat pressure; and opening the sealing door, pulling the hopper out of the oven, and discharging the dried sludge to finish drying a batch of sludge.
In another method of the invention, the hopper of the sludge low-temperature drying device is integrally arranged on a wagon balance; a material guide pipe is arranged on the sealing door, the lower end of the material guide pipe is communicated with the inside of the oven, and the upper end of the material guide pipe is detachably connected with a sealing cover; a feeding pump for feeding sludge to be dried into the hopper and a suction pump for sucking dried sludge in the hopper out of the hopper are arranged outside the oven; the feeding end and the discharging end of the feeding pump are both connected with feeding pipelines, and the other end of the feeding pipeline connected with the discharging end of the feeding pump can penetrate through the material guide pipe and extend into the hopper after the sealing cover is opened, so that sludge to be dried is fed into the hopper; the feeding end and the discharging end of the suction pump are both connected with a suction pipeline, and the other end of the suction pipeline connected with the feeding end of the suction pump can penetrate through the material guide pipe and extend into the hopper after the sealing cover is opened, so as to suck out the dried sludge in the hopper.
The sludge low-temperature drying device is used for drying sludge and comprises the following steps:
s1, detecting the initial water content of the sludge to be dried.
S2, opening a sealing cover of the material guide pipe, enabling the other end of the material feeding pipeline connected with the discharge end of the material feeding pump to penetrate through the material guide pipe and extend into the hopper, starting the material feeding pump to pump sludge to be dried into the hopper, closing the material feeding pump after the material pumping is finished, drawing out the material feeding pipeline, and tightly covering the sealing cover.
S3, starting a heating device to heat the oven; adding water into a circulating water tank, and starting a water ring pump to vacuumize the oven; and starting the stirring mechanism to stir the sludge in the hopper.
S4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; according to the weight value of the hopper and the change condition thereof measured and displayed by the loadometer, the sludge drying process can be judged; when the weight reduction value of the hopper reaches the weight of the water to be removed, the sludge drying end point is reached.
S5, stopping the heating device, the stirring mechanism and the water ring pump in sequence after the sludge drying end point is reached; opening the sealing cover to deflate to flat pressure; and (3) the other end of the material suction pipeline connected with the feeding end of the material suction pump penetrates through the material guide pipe and extends into the hopper, the material suction pump is started to pump the dried sludge out of the hopper, after the material pumping is finished, the material suction pump is closed, the material suction pipeline is pumped out, and then the drying of a batch of sludge is finished.
The method for drying the sludge has the advantages that:
first, it is environmentally friendly. The sludge drying method is beneficial to harmless treatment or resource utilization of sludge (solid waste), and has the characteristics of low equipment noise, no waste gas pollution, easy treatment of waste water pollution, low energy consumption, capability of utilizing waste heat and the like.
Second, the endpoint can be accurately determined. The sludge drying end point can be accurately judged by directly weighing the sludge weight and the change condition, and the method is simple and reliable.
Thirdly, the equipment is simple. Compared with the common sludge drying system, the device has the advantages that the steam condensing tank and the deodorizing tower are omitted, and other devices are simple and convenient to manufacture.
Fourthly, the cost is low. The process is simple, and the equipment is few, so the investment is not large. Because the drying efficiency is high, waste gas does not need to be treated, and the wastewater returns to a sewage treatment plant for treatment at almost zero cost, the operation cost is low.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a low-temperature sludge drying device according to the present invention;
shown in the figure: 1-stirring mechanism, 2-baking oven, 3-hopper, 4-bolt, 5-sealing door, 6-circulating water tank, 7-water ring pump, 8-loadometer scale and 9-heating device.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
as shown in figure 1, the low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint adopts a low-temperature sludge drying device to dry and dehydrate sludge.
The sludge low-temperature drying device comprises an oven 2, a water ring pump 7, a circulating water tank 6, a heating device 9, a loadometer scale 8, a hopper 3 and a stirring mechanism 1.
The oven 2 is a hollow box body with an opening at the top and a closed periphery, and the volume of the box body can be adjusted as required. The top of the oven 2 is detachably connected with a sealing door 5 through a bolt 4, and a sealing gasket is arranged between the sealing door 5 and the opening at the top of the oven 2. After the oven 2 is connected with the sealing door 5 through the bolt 4 and the rubber mat, a closed space is formed in the oven 2.
The water ring pump 7 (namely the existing water ring vacuum pump) is arranged outside the oven 2, and an air inlet of the water ring pump 7 (through a vacuum rubber tube or a steel tube or a hard plastic tube) is communicated with the inside of the oven 2 and used for vacuumizing the inside of the oven 2 (pumping out the air in the oven 2). The invention adopts the water ring pump 7 as evacuating power, directly pumps out the water vapor in the oven 2, compresses and cools the water vapor to form water, and then the water vapor enters the working solution, and a special steam condensing tank is not needed; the working solution can be recycled by using tap water, is discharged periodically (but cannot be discharged completely), and returns to a sewage treatment plant for treatment; the water serves not only as a working fluid for the water ring pump 7 but also as a waste gas absorbing liquid for transferring odor (ammonia gas, hydrogen sulfide, etc.) and dust in the pumped gas (waste gas) into the water, and a waste gas treatment facility such as a deodorizing tower is not required.
The circulating water tank 6 is connected with the water ring pump 7 through two pipelines, working liquid in the circulating water tank 6 continuously circulates in the water ring pump 7 through the two pipelines (the circulating water tank 6 and the water ring pump 7 form an annular loop through the two pipelines), and the working liquid can effectively reduce the temperature of water vapor entering the water ring pump 7 due to the fact that the temperature difference between the working liquid in the water ring pump 7 and the water vapor entering the water ring pump 7 is large, so that the water vapor is rapidly condensed into water and is blended into the working liquid. The water in the circulating water tank 6 is discharged intermittently at proper time according to the water temperature and the water level, and is returned to a sewage treatment plant for treatment, and the water cannot be discharged completely when the water is discharged, so that the operation of a water ring pump needs to be ensured; and supplementing tap water in a proper amount to ensure the condensation of water vapor.
The heating device 9 is arranged in the oven 2 and is used for directly heating the oven 2; the heating device 9 can be any one of a conventional electric furnace, an electric hot plate, an electric hot bar, a steam heat exchanger, a hot air heat exchanger and a factory waste heat conveying mechanism, and the heat source is electricity, steam or waste heat. The drying temperature in the oven can be controlled widely, the drying temperature can be controlled between 60 ℃ and 120 ℃ (preferably 100 ℃), and if the heat source is used for utilizing waste heat, the temperature does not need to be controlled intentionally.
The weighbridge 8 is installed at the inside downside of oven 2, chooses conventional iron (stainless steel) platform formula weighbridge for use for measuring and showing 3 weight values of hopper and situation of change, and weighbridge 8 separates into two upper and lower cavitys with oven 2 is inside, and heating device 9 installs in weighbridge 8 below.
The stirring mechanism 1 (which adopts a conventional stirrer) is arranged in the hopper 3 (the stirring part is positioned in the hopper, and the motor is positioned outside the hopper) and is used for stirring sludge in the hopper 3. Stirring mechanism 1 stirs mud in succession or intermittent type in process of production, and along with the rotation of stirring mechanism 1 (stirring portion), mud is constantly stirred, and large granule mud is smashed, exposes fresh evaporation surface, makes the waste gas in the mud distribute out from mud, is favorable to improving mummification efficiency, can detach the foul smell in the mud simultaneously. The stirring mechanism 1 can be transversely arranged or vertically arranged (preferably transversely arranged), and the number of the stirring mechanisms 1 can be increased as required during transverse arrangement so as to ensure uniform stirring and improve the stirring efficiency.
The sludge drying method by adopting the sludge low-temperature drying device comprises the following steps:
s1, detecting the initial water content of the sludge to be dried, wherein the initial water content of the sludge to be dried is about 80%.
S2, charging sludge to be dried into a hopper 3; hoisting the hopper 3 filled with the sludge into the oven 2 through a hoisting device, and placing the hopper 3 on a loadometer scale 8; the sealing door 5 is locked (by bolts 4 and gaskets) and sealed on the top of the oven 2.
S3, starting a heating device 9 to heat the oven 2; adding water into the circulating water tank 6, starting the water ring pump 7 to vacuumize the oven 2, and controlling the vacuum degree in the oven 2 to be between-80 kpa and-85 kpa; and starting the stirring mechanism 1 to stir the sludge in the hopper.
S4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; the sludge drying process can be judged according to the weight value and the change condition of the hopper 3 measured and displayed by the loadometer 8; when the weight reduction value of the hopper 3 reaches the weight of the water to be removed, the sludge drying end point is reached.
S5, after the sludge drying end point is reached, stopping the heating device 9, the stirring mechanism 1 and the water ring pump 7 in sequence; the oven 2 is deflated to be flat pressure; the sealing door 5 is dismounted; and (4) hoisting the hopper 3 out of the oven 2, and discharging the dried sludge to finish drying a batch of sludge.
In the embodiment, before the hopper 3 filled with the sludge to be dried is hoisted out, the other hopper 3 filled with the sludge to be dried can be prepared in advance, and after the hopper 3 filled with the sludge to be dried is hoisted out, the next hopper 3 filled with the sludge to be dried is hoisted into the oven 2 immediately, so that the overall drying speed is improved.
The water content of the sludge in the hopper is calculated according to the following formula:
M 1 (1-a)=M 2 (1-b), i.e. b =1-M 1 (1-a)/M 2 ;
Wherein M is 1 The initial weight of the sludge in the hopper is taken as the sludge; a is the initial water content of the sludge measured before drying; m 2 The weight of the sludge in the hopper is the weight of the sludge in the drying process or at the end of the drying process; and b is the water content of the sludge in the drying process or after the drying is finished.
M 1 And M 2 The calculation formula is as follows:
M 1 =N 1 -N；M 2 =N 2 -N；
wherein N is 1 Weighing the total weight of the sludge and the hopper by a platform scale before drying; n is a radical of 2 The total weight of the sludge and the hopper is weighed by a platform scale during or after the drying process is finished; and N is the empty weight of the hopper (the weight of the sludge when not filled is also weighed by a platform scale).
Example 2:
the embodiment 1 needs to be adopted, and the hopper 3 is frequently hoisted in or out for loading and unloading materials, which is troublesome. In order to overcome the above disadvantages, the present embodiment improves the sludge low-temperature drying apparatus as follows:
this example differs from example 1 in that:
the side surface of the oven 2 is provided with an opening, and the sealing door 5 is detachably connected to the opening on the side surface of the oven 2; the hopper 3 and the stirring mechanism therein can be pushed into or pulled out of the oven 2 to load and unload sludge.
The sludge low-temperature drying device is adopted to dry sludge and comprises the following steps:
s1, detecting the initial water content of the sludge to be dried, wherein the initial water content of the sludge to be dried is about 80%.
S2, charging sludge to be dried into a hopper 3; opening the sealing door 5, pushing the hopper 3 filled with the sludge into the oven 5, and placing the hopper 3 on the loadometer scale 8; the sealing door 5 is locked and sealed on the side surface of the oven 2.
S3, starting a heating device 9 to heat the oven 2; adding water into the circulating water tank 6, starting the water ring pump 7 to vacuumize the oven 2, and controlling the vacuum degree in the oven 2 to be between 80kpa and 85 kpa; and starting the stirring mechanism 1 to stir the sludge in the hopper 3.
S4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; the sludge drying process can be judged according to the weight value and the change condition of the hopper 3 measured and displayed by the loadometer 8; when the weight reduction value of the hopper 3 reaches the weight of the water to be removed, the sludge drying end point is reached.
S5, after the sludge drying end point is reached, stopping the heating device 9, the stirring mechanism 1 and the water ring pump 7 in sequence; the oven 2 is deflated to be flat pressure; and opening the sealing door 5, pulling the hopper 3 out of the oven 2, and discharging the dried sludge to finish drying a batch of sludge.
Example 3:
when the hopper in the embodiment 1 is adopted, the bolt 4 needs to be screwed every time sludge drying is completed, then the sealing door 5 is opened, and then the hopper 3 is lifted out by a crane, and if the sludge to be dried is large in quantity and the capacity of the hopper 2 is small, the hopper 3 needs to be lifted in or out frequently for loading and unloading, which is troublesome. In order to overcome the above disadvantages, the present embodiment improves the sludge low-temperature drying apparatus as follows.
This example differs from example 1 in that:
unlike the embodiment 1 in which the hopper 3 is placed on the wagon balance 8 and can be hoisted into or out of the oven 2, the hopper 3 is integrally mounted on the wagon balance 8 (the hopper 3 does not need to be hoisted into or out of the oven 2); a material guide pipe (used for feeding or pumping materials into the hopper 3) is arranged on the sealing door 5, the lower end of the material guide pipe is communicated with the inside of the oven 3 (and is opposite to the opening at the top of the hopper 3), and the upper end of the material guide pipe is detachably connected with a sealing cover; a feeding pump for feeding sludge to be dried into the hopper 3 and a suction pump for sucking dried sludge in the hopper 3 out of the hopper 3 are arranged outside the oven 2; the feeding end and the discharging end of the feeding pump are both connected with feeding pipelines, and the other end of the feeding pipeline connected with the discharging end of the feeding pump can penetrate through the material guide pipe and extend into the hopper after the sealing cover is opened, so that sludge to be dried is fed into the hopper 3; the feed end and the discharge end of the suction pump are both connected with a suction pipeline, and the other end of the suction pipeline connected with the feed end of the suction pump can penetrate through the material guide pipe and extend into the hopper 3 after the sealing cover is opened, so as to suck out the dried sludge in the hopper 3. Stirring mechanism 1 (stirring mechanism 1 adopts current mixer equally in this embodiment, and the vertical setting of its (mixing) shaft is installed around the (mixing) shaft at the stirring piece), can set up the scraper blade on the stirring piece in the (mixing) shaft outside simultaneously, scrapes the mud of hopper inner wall down, prevents the mud caking on the 3 inner walls of hopper. In order to accelerate the feeding speed, the number of the feeding pumps and the feeding pipelines can be increased as required to carry out rapid feeding; in order to accelerate the material suction speed, the number of the material suction pumps and the material suction pipelines can be increased as required to quickly suck the materials.
Due to the improvement of the structure, the sludge drying method of the embodiment is different from that of embodiment 1, and the steps of drying the sludge by using the low-temperature sludge drying device of the embodiment are as follows:
s1, detecting the initial water content of the sludge to be dried, wherein the initial water content of the sludge to be dried is about 80%.
S2, opening a sealing cover of the material guide pipe, enabling the other end of the material feeding pipeline connected with the discharge end of the material feeding pump to penetrate through the material guide pipe and extend into the hopper, starting the material feeding pump to pump sludge to be dried into the hopper 3, closing the material feeding pump after the material pumping is finished, drawing out the material feeding pipeline, and tightly covering the sealing cover.
S3, starting a heating device 9 to heat the oven 2; adding water into the circulating water tank 6, starting the water ring pump 7 to vacuumize the oven 2, and controlling the vacuum degree in the oven 2 to be between-80 kpa and-85 kpa; and starting the stirring mechanism 1 to stir the sludge in the hopper 3.
S4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; according to the weight value and the change condition of the hopper 3 (the hopper 3 and the total weight of the sludge in the hopper 3 and the stirring mechanism 1) measured and displayed by the loadometer 8, the sludge drying process can be judged; when the weight reduction value of the hopper 3 reaches the weight of the water to be removed, the sludge drying end point is reached.
S5, after the sludge drying end point is reached, stopping the heating device 9, the stirring mechanism 1 and the water ring pump 7 in sequence; opening the sealing cover to deflate to flat pressure; and (3) the other end of the material suction pipeline connected with the feeding end of the material suction pump penetrates through the material guide pipe and extends into the hopper 3, the material suction pump is started to pump the dried sludge out of the hopper 3, after the material pumping is finished, the material suction pump is closed, the material suction pipeline is pumped out, and the drying of a batch of sludge is finished.
Example 4:
this example differs from examples 1-3 in that:
in order to further realize the drying of the sludge (drying the sludge to a lower water content) and simultaneously improve the drying efficiency, in the step S4 or the step M4, when the water content of the sludge in the hopper is changed to 45-65% (generally about 60%), the vacuum degree in the oven 2 is controlled in a pulsating mode, namely, a precise pressure relief valve is arranged at the air exhaust end of the water ring pump 7, the opening of the valve of the precise pressure relief valve is controlled to reduce the vacuum degree to-60 kpa, after the vacuum degree is maintained at about-60 kpa for 30-60 seconds, controlling the opening degree of a valve of the precision pressure relief valve to enable the vacuum degree in the oven 2 to be controlled again within the range of-80 kpa to-85 kpa and kept for 10-15 minutes, then continuously reducing the vacuum degree to-60 kpa and keeping for 30-60 seconds, repeating the steps until the water content of the sludge in the hopper is required (generally controlled below 20%); stopping the drying process to complete drying, and taking out the dried sludge; vacuum pulsation formula control can make the mud dust of suspension fall into mud again (different according to steam and dust proportion, realizes mud and steam separation, and steam is taken away, and mud then descends to mud in, further absorbs the moisture in the mud, promotes mummification efficiency), absorbs the moisture of mud in the hopper, when the vacuum degree rises once more, the mud dust is suspended once more (the suspension boiling), and then the efficient loses the moisture that contains in it, promotes dewatering efficiency. Can further can dismantle at the hopper and set up a sieve that has a lot of sieve meshes (restriction dust is by the suction water ring pump, reduces water ring pump operating pressure), can set up a vibrating motor on the sealing door, set up the eccentric wheel on the vibrating motor, the eccentric wheel is the high frequency under the vibrating motor drive and is beaten the sieve, prevents that the sieve mesh is blockked up to the dust.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The scope of the present invention is not limited to the technical solutions disclosed in the embodiments, and any modifications, equivalent substitutions, improvements, etc. made to the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (10)
1. The method adopts a low-temperature sludge drying device to dry and dehydrate sludge, wherein the low-temperature sludge drying device comprises an oven detachably connected with a sealing door, a water ring pump arranged outside the oven and used for vacuumizing the inside of the oven, and a circulating water tank arranged outside the oven and used for providing working liquid for the water ring pump to work; the method is characterized in that: a heating device, a loadometer scale, a hopper and a stirring mechanism are arranged in the oven; the heating device is used for heating the inside of the drying oven and controlling the temperature in the drying oven, so that water in sludge in the hopper is changed into water vapor which is pumped away by the water ring pump; the loadometer is arranged at the lower side in the oven and is used for measuring and displaying the weight value of the hopper and the change condition of the hopper; the hopper is placed on the loadometer scale and used for containing sludge; the stirring mechanism is arranged in the hopper and is used for stirring sludge in the hopper.
2. The environment-friendly low-temperature sludge drying method capable of accurately judging the endpoint as claimed in claim 1, wherein the working fluid in the circulating water tank is tap water.
3. The environment-friendly low-temperature sludge drying method capable of accurately judging the endpoint as claimed in claim 1, wherein the temperature in the oven is controlled to be 60-120 ℃.
4. The environment-friendly low-temperature sludge drying method capable of accurately judging the endpoint as claimed in claim 1, wherein the initial water content of the sludge to be dried is above 60%.
5. The low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint according to any one of claims 1 to 4, is characterized in that the top of the oven is provided with an opening, and the sealing door is detachably connected with the top of the oven; the hopper and the stirring mechanism therein can be hoisted into or out of the oven to load and unload sludge.
6. The low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint according to claim 5, is characterized in that the steps of drying the sludge by adopting the low-temperature sludge drying device are as follows:
s1, detecting the initial water content of sludge to be dried;
s2, charging sludge to be dried into a hopper; hoisting the hopper filled with the sludge into the oven through a hoisting device, and placing the hopper on a loadometer scale; tightly sealing a sealing door on the top of the oven;
s3, starting a heating device to heat the oven; adding water into a circulating water tank, and starting a water ring pump to vacuumize the oven; starting a stirring mechanism to stir the sludge in the hopper;
s4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; according to the weight value of the hopper and the change condition thereof measured and displayed by the loadometer, the sludge drying process can be judged; when the weight reduction value of the hopper reaches the weight of the water to be removed, the sludge drying end point is reached;
s5, stopping the heating device, the stirring mechanism and the water ring pump in sequence after the sludge drying end point is reached; deflating the oven to a flat pressure; disassembling the sealing door; and (4) lifting the hopper out of the oven, and discharging the dried sludge to finish drying a batch of sludge.
7. The low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint according to any one of claims 1 to 4, is characterized in that: the side surface of the oven is provided with an opening, and the sealing door is detachably connected to the opening on the side surface of the oven; the hopper and the stirring mechanism therein can be pushed into or pulled out of the oven to load and unload sludge.
8. The low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint according to claim 7, is characterized in that the steps of drying the sludge by adopting the low-temperature sludge drying device are as follows:
s1, detecting the initial water content of sludge to be dried;
s2, feeding sludge to be dried into a hopper; opening a sealing door, pushing the hopper filled with the sludge into the oven, and placing the hopper on the loadometer scale; tightly locking and sealing a sealing door on the side surface of the oven;
s3, starting a heating device to heat the oven; adding water into a circulating water tank, and starting a water ring pump to vacuumize the oven; starting a stirring mechanism to stir the sludge in the hopper;
s4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; according to the weight value of the hopper and the change condition thereof measured and displayed by the loadometer, the sludge drying process can be judged; when the weight reduction value of the hopper reaches the weight of the water to be removed, the sludge drying end point is reached;
s5, stopping the heating device, the stirring mechanism and the water ring pump in sequence after the sludge drying end point is reached; deflating the oven to a flat pressure; and opening the sealing door, pulling the hopper out of the oven, and discharging the dried sludge to finish drying a batch of sludge.
9. The low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint according to any one of claims 1 to 4, characterized in that the hopper is integrally arranged on a wagon balance; a material guide pipe is arranged on the sealing door, the lower end of the material guide pipe is communicated with the inside of the oven, and the upper end of the material guide pipe is detachably connected with a sealing cover; a feeding pump for feeding sludge to be dried into the hopper and a suction pump for sucking dried sludge in the hopper out of the hopper are arranged outside the oven; the feeding end and the discharging end of the feeding pump are both connected with feeding pipelines, and the other end of the feeding pipeline connected with the discharging end of the feeding pump can penetrate through the material guide pipe and extend into the hopper after the sealing cover is opened, so that sludge to be dried is fed into the hopper; the feeding end and the discharging end of the suction pump are both connected with a suction pipeline, and the other end of the suction pipeline connected with the feeding end of the suction pump can penetrate through the material guide pipe and extend into the hopper after the sealing cover is opened, so as to suck out the dried sludge in the hopper.
10. The low-temperature sludge drying method which is environment-friendly and can accurately judge the endpoint according to claim 9, is characterized in that the steps of drying the sludge by adopting the low-temperature sludge drying device are as follows:
s1, detecting the initial water content of sludge to be dried;
s2, opening a sealing cover of the material guide pipe, enabling the other end of a material feeding pipeline connected with the discharge end of the material feeding pump to penetrate through the material guide pipe and extend into the hopper, starting the material feeding pump to pump sludge to be dried into the hopper, closing the material feeding pump after material pumping is finished, drawing out the material feeding pipeline, and tightly covering the sealing cover;
s3, starting a heating device to heat the oven; adding water into a circulating water tank, and starting a water ring pump to vacuumize the oven; starting a stirring mechanism to stir the sludge in the hopper;
s4, calculating the weight of water to be removed according to the initial water content and the set end point water content of the sludge; according to the weight value of the hopper and the change condition thereof measured and displayed by the loadometer, the sludge drying process can be judged; when the weight reduction value of the hopper reaches the weight of the water to be removed, the sludge drying end point is reached;
s5, stopping the heating device, the stirring mechanism and the water ring pump in sequence after the sludge drying end point is reached; opening the sealing cover to deflate to flat pressure; and (3) the other end of the material suction pipeline connected with the feeding end of the material suction pump penetrates through the material guide pipe and extends into the hopper, the material suction pump is started to pump the dried sludge out of the hopper, after the material pumping is finished, the material suction pump is closed, the material suction pipeline is pumped out, and then the drying of a batch of sludge is finished.
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| JPS6041598A (en) * | 1983-08-17 | 1985-03-05 | Hitachi Kiden Kogyo Ltd | Controlling process of passed air quantity in compositing process |
| CN103626374A (en) * | 2012-08-28 | 2014-03-12 | 北大工学院绍兴技术研究院 | Granulation drying method for wet sludge |
| CN112679067A (en) * | 2020-11-24 | 2021-04-20 | 无锡锡源真空设备有限公司 | Vacuum drying method for sludge |
| CN216129486U (en) * | 2021-08-26 | 2022-03-25 | 中煤（北京）环保工程有限公司 | Low-temperature vacuum sludge drying machine assembly |
| CN218931927U (en) * | 2022-05-31 | 2023-04-28 | 罗时雨 | Environment-friendly sludge low-temperature drying device capable of accurately judging end point |
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2022
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6041598A (en) * | 1983-08-17 | 1985-03-05 | Hitachi Kiden Kogyo Ltd | Controlling process of passed air quantity in compositing process |
| CN103626374A (en) * | 2012-08-28 | 2014-03-12 | 北大工学院绍兴技术研究院 | Granulation drying method for wet sludge |
| CN112679067A (en) * | 2020-11-24 | 2021-04-20 | 无锡锡源真空设备有限公司 | Vacuum drying method for sludge |
| CN216129486U (en) * | 2021-08-26 | 2022-03-25 | 中煤（北京）环保工程有限公司 | Low-temperature vacuum sludge drying machine assembly |
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