High-effect sludge deep dehydration coupling resource utilization system and method

Abstract

The invention discloses a high-effect sludge deep dehydration coupling resource utilization system and method, and relates to the technical field of sewage treatment.The method comprises the steps that special stirring equipment is adopted for stirring sludge, the stirred sludge is pretreated through ultrasonic waves and an advanced oxidation technology, and pretreated sludge is obtained; discharging free water and interstitial water from the pretreated sludge through an intelligent pressure maintaining and pressure relief regulation mechanism, then carrying out microwave-assisted heating by using a continuous low-temperature sludge drying machine, and adjusting microwave power and heating time to deeply remove bound water and interstitial water; carrying out pyrolysis carbonization on the sludge subjected to microwave-assisted heating through an indirect heating reaction furnace, and converting organic matters in the sludge into pyrolysis products; the sludge treatment efficiency and quality are remarkably improved through a series of innovative technologies, the special stirring equipment is combined with ultrasonic waves and the advanced oxidation technology, the physical and chemical properties of the sludge are optimized, and the energy consumption of the subsequent process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a high-efficiency sludge deep dehydration coupled resource utilization system and method. Background Art

[0002] In recent years, with the rapid development of the sewage treatment industry, it has attracted widespread attention. Traditional sludge treatment methods mainly include mechanical dehydration, thermal drying, incineration and landfill. With the increasingly stringent environmental protection requirements and technological progress, sludge deep dehydration coupled with resource utilization has gradually become a research hotspot. For example, ultrasonic technology and advanced oxidation technology are widely used in the sludge pretreatment stage to improve the physical and chemical properties of sludge and promote the subsequent dehydration process; continuous low-temperature sludge dryer achieves efficient removal of water in sludge through microwave-assisted heating, significantly reducing the sludge water content; pyrolysis carbonization, as an emerging sludge treatment method, can not only convert organic matter in sludge into valuable biochar, pyrolysis gas and tar, but also has lower carbon emissions and environmental pollution risks. The application of waste heat recovery technology further improves the energy efficiency of the entire system and realizes energy recycling.

[0003] Although the existing sludge treatment technology has met the market demand to a certain extent, it still has some shortcomings in practical application. First, the traditional mechanical dehydration and thermal drying methods have high energy consumption, and it is difficult to completely remove the bound water in the sludge, resulting in the final product The moisture content is still relatively high, affecting the effect of subsequent resource utilization. Secondly, the existing technology has limited conversion efficiency for organic matter in sludge and cannot fully recover the energy and material resources contained therein. Furthermore, many processes have failed to effectively solve the problem of heat recovery from high-temperature flue gas, resulting in energy waste. Finally, there is a lack of effective ways to finely classify and collect pyrolysis products and utilize them as resources, which limits the large-scale promotion of pyrolysis technology. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a high-efficiency sludge deep dehydration coupled resource utilization method to solve the problems of high energy consumption, incomplete removal of bound water, low organic matter conversion efficiency, insufficient heat recovery and lack of resource utilization path for pyrolysis products in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: In a first aspect, the present invention provides a high-efficiency sludge deep dehydration coupled resource utilization method, which comprises: The sludge is stirred by a stirring device, and the stirred sludge is pretreated by ultrasonic and advanced oxidation technology to obtain pretreated sludge; The pretreated sludge is discharged with free water and interstitial water through the intelligent pressure maintenance and pressure relief control mechanism, and then microwave-assisted heating is performed using a continuous low-temperature sludge dryer to adjust the microwave power and heating time to deeply remove bound water and interstitial water; The microwave-assisted heated sludge is pyrolyzed and carbonized by an indirect heating reactor to convert organic matter in the sludge into pyrolysis products; The waste heat is released by the pyrolysis furnace, and the heat in the high-temperature flue gas is recovered by heat exchange equipment, and the heat in the high-temperature flue gas is used in different links of the front-end process; Through purification and separation processes, the pyrolysis products are collected and classified, and the optimal resource utilization path is selected according to the characteristics of the pyrolysis products.

[0007] As a preferred solution of the high-efficiency sludge deep dehydration coupled resource utilization method of the present invention, wherein: the sludge is stirred by a stirring device, and the stirred sludge is pretreated by ultrasound and advanced oxidation technology to obtain pretreated sludge, and the specific steps are: The double-shaft stirring device in the buffer hopper is driven by a helical gear reducer to stir the sludge. During the stirring process, the viscosity and moisture content of the sludge are monitored by a viscosity probe and a humidity probe. The stirred sludge is poured into the ultrasonic treatment equipment to destroy the water film bound to the particle surface and break up the particles through the cavitation effect; The sludge treated with ultrasound is mixed with a persulfate solution, and iron ions are added as a catalyst to generate sulfate radicals to oxidize and decompose the organic matter in the sludge; The chemical oxygen demand (COD) and the redox potential (ORP) in the reactor are monitored by a COD probe and an ORP probe, and an oxidation threshold is set. When the oxidation value reaches the oxidation threshold, the addition of the reagent is stopped to obtain the pretreated sludge.

[0008] As a preferred solution of the high-efficiency sludge deep dehydration coupled resource utilization method of the present invention, wherein: the pretreated sludge is discharged with free water and interstitial water through an intelligent pressure maintenance and pressure relief control mechanism, and then a continuous low-temperature sludge dryer is used for microwave-assisted heating, and the microwave power and heating time are adjusted to deeply remove bound water and interstitial water. The specific steps are: The pretreated sludge is sent to the intelligent pressure-maintaining equipment for gradual pressurization. A multi-stage pressure control method is adopted, and the circulating fan, main fan and independent compressor are used to gradually increase the pressure inside the intelligent pressure-maintaining equipment, discharge free water and interstitial water, and monitor the moisture content of the sludge through a humidity probe; According to the moisture content of the pretreated sludge, a dynamic pressure-maintaining control formula is constructed to adjust the pressure-maintaining pressure. The expression is: ; in, Indicates at time The holding pressure at Indicates the maximum holding pressure value. represents the adjustment parameter, represents the initial moisture content, Indicates at time The residual moisture content at After pressurization is completed, the pressure is gradually released at a set rate through the pressure relief operation; The sludge after pressure maintenance and pressure relief treatment is cut into strips by a strip cutting device, and then sent to the drying area by a conveying device. The evaporator, condenser and fin heat regenerator are used to maintain a closed-loop dehumidification and drying environment in the drying area; During the drying process, microwaves are used to heat the moisture inside the sludge, and the temperature and moisture content of the sludge are monitored by humidity and temperature probes; According to the monitored sludge moisture content and temperature, the microwave power and heating time are dynamically adjusted using the microwave power dynamic control formula, which is expressed as: ; in, Indicates at time The microwave power at represents the initial microwave power, Indicates at time The change of sludge moisture content at represents the target optimized moisture content, represents the temperature control sensitivity coefficient, Indicates at time The sludge temperature at represents the target microwave heating temperature; After microwave-assisted heating, the bound water and interstitial water in the sludge were deeply removed, and the moisture content was reduced to the set target range.

[0009] As a preferred solution of the high-efficiency sludge deep dehydration coupled resource utilization method of the present invention, wherein: the sludge after microwave assisted heating is pyrolyzed and carbonized by an indirect heating reactor to convert organic matter in the sludge into pyrolysis products, the specific steps are: The transmission channel is constructed of anti-sticking woven mesh and stainless steel mesh. The transmission channel is driven by the main transmission shaft and the slave transmission shaft to transfer the sludge after microwave-assisted deep dehydration from the continuous low-temperature sludge dryer to the indirect heating reactor. The moisture content and temperature of the sludge are monitored by humidity probes and temperature probes. In the reactor, the reactor jacket is indirectly heated by an external heat source to raise the temperature of the sludge in the reactor to the target temperature of the pyrolysis reaction; During the pyrolysis carbonization process, the organic matter in the sludge is decomposed into biochar, pyrolysis gas and tar; The pyrolysis reaction temperature, gas product concentration, initial external heating heat flow and biochar carbon content were monitored by temperature control probes, pyrolysis gas sensors and biochar detection equipment; According to the monitored pyrolysis reaction temperature, gas product concentration, initial external heat flow and biochar carbon content, a dynamic heat flow control model for pyrolysis temperature is constructed to dynamically adjust the heat flow of the external heat source. The expression is: ; in, Indicates at time The actual heating heat flow is represents the initial external heating heat flow, represents the gas concentration control coefficient, Indicates at time The actual gas concentration produced by pyrolysis is represents the target pyrolysis gas concentration, represents the base of natural logarithm, represents the temperature control sensitivity coefficient, Indicates at time The actual pyrolysis reaction temperature is represents the target pyrolysis reaction temperature, Indicates at time The actual amount of biochar generated is represents the target biochar content, represents the biochar regulation coefficient; when > When , the heat flow is increased to compensate for the lack of reaction; when = When , the current heating heat flow remains unchanged; when < When the temperature is too low, the heat flow is reduced to avoid overheating.

[0010] As a preferred solution of the high-efficiency sludge deep dehydration coupled resource utilization method of the present invention, wherein: the waste heat is released by the pyrolysis furnace, the heat in the high-temperature flue gas is recovered by the heat exchange equipment, and the heat in the high-temperature flue gas is used in different links of the front-end process respectively. The specific steps are: The high-temperature flue gas discharged from the indirect heating reactor enters the external cooler, where it exchanges heat with the cold water required for the sludge pretreatment stage. The cold water is heated to become hot water and is used to adjust the temperature of the sludge during the mixing process. The medium-temperature flue gas treated by the external cooler is discharged into the condenser, and the medium-temperature flue gas exchanges heat with the cold air in the continuous low-temperature sludge dryer. The cold air is heated to form dry hot air and is used in the sludge drying process; The low-temperature flue gas treated by the condenser is discharged into the fin heat regenerator, and the low-temperature flue gas exchanges heat with the sludge before entering the indirect heating reactor, which is used for the preheating process of the sludge before entering the indirect heating reactor; The flue gas inlet temperature, flue gas outlet temperature and recovered heat are collected through heat probes and temperature probes; According to the collected flue gas inlet temperature, flue gas outlet temperature and recovered heat, a dynamic heat recovery and distribution control formula is constructed to adjust the heat transfer efficiency of high-temperature flue gas in the pyrolysis process in real time. The expression is: ; in, Indicates at time The actual heat recovery amount at is the maximum heat recovery value, Indicates at time The temperature of the high-temperature flue gas entering the heat exchanger is Indicates at time The flue gas temperature discharged from the heat exchanger is The optimal temperature difference for target heat transfer, is the heat transfer efficiency control coefficient; Said For the optimal temperature difference of target heat transfer, When, it means at time The heat transfer efficiency is highest when when ≥ When , it means that the heat recovery efficiency is high and there is no need to optimize the operating status of the heat exchanger; when < When , it indicates that the heat recovery efficiency is low. The operating state of the heat exchanger is optimized by adjusting the flow ratio between the high-temperature flue gas and the cold fluid.

[0011] As a preferred solution of the high-efficiency sludge deep dehydration coupled resource utilization method of the present invention, wherein: the pyrolysis products are classified and collected through purification and separation processes, and the optimal resource utilization path is selected according to the characteristics of the pyrolysis products. The specific steps are: The pyrolysis gas generated by pyrolysis is purified by a fin heat regenerator combined with a pulse dust removal filter, and high-purity hydrogen is extracted from the pyrolysis gas using membrane separation technology as industrial clean energy; The biochar generated by pyrolysis is screened and graded according to particle size distribution and ash content. Large-particle biochar is used as a soil conditioner, and small-particle biochar is activated to become activated carbon. The tar generated by pyrolysis is separated from other liquids by a centrifuge and the separated tar is sent to a refinery for further processing to produce asphalt.

[0012] In the second aspect, the present invention provides a high-efficiency sludge deep dehydration coupled resource utilization system, including a pretreatment module, an intelligent dehydration module, a pyrolysis carbonization module, a waste heat recovery module and a product recovery module: The pretreatment module is used to pretreat the sludge by means of a stirring device, ultrasonic treatment and advanced oxidation technology; The intelligent dehydration module is used to deeply remove free water, interstitial water and bound water in sludge by using an intelligent pressure-maintaining and pressure-releasing control mechanism and microwave-assisted heating; The pyrolysis carbonization module is used to pyrolyze and carbonize the dehydrated sludge into valuable biochar, pyrolysis gas and tar; The waste heat recovery module is used to recover the heat in the high-temperature flue gas and reasonably distribute it to the front-end process; The product recovery module is used to classify, collect and purify the pyrolysis products and select the optimal resource utilization path according to their characteristics.

[0013] In a third aspect, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, any step of the high-efficiency sludge deep dehydration coupled resource utilization method as described in the first aspect of the present invention is implemented.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the high-efficiency sludge deep dehydration coupled resource utilization method as described in the first aspect of the present invention is implemented.

[0015] The beneficial effects of the present invention are as follows: the present invention significantly improves the efficiency and quality of sludge treatment through a series of innovative technologies; the special stirring equipment combines ultrasound and advanced oxidation technology to optimize the physical and chemical properties of sludge and reduce the energy consumption of subsequent processes; the intelligent pressure maintenance and pressure relief mechanism and the microwave-assisted heating of the low-temperature dryer deeply remove free water, interstitial water and bound water, and reduce the moisture content of the final product; the indirect heating reactor efficiently converts organic matter to generate high-value-added biochar, pyrolysis gas and tar, and reduces carbon emissions; the waste heat recovery system improves energy efficiency, reduces energy waste, and realizes energy recycling; the purification and separation process ensures the refined classification and efficient resource utilization of pyrolysis products, and enhances economic benefits and environmental friendliness; on the whole, the present invention improves treatment efficiency, reduces energy consumption and environmental pollution risks, and realizes maximum resource recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 This is a flow chart of the high-efficiency sludge deep dehydration coupled resource utilization method in Example 1.

[0018] Figure 2 This is a schematic diagram of the high-efficiency sludge deep dehydration coupled resource utilization system in Example 1. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0020] Example 1, reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, and provides a high-efficiency sludge deep dehydration coupled resource utilization method, comprising the following steps: S1. Agitating the sludge using a stirring device, and pre-treating the stirred sludge using ultrasonic waves and advanced oxidation technology to obtain pre-treated sludge; The double-shaft stirring device in the buffer hopper is driven by a helical gear reducer to stir the sludge. During the stirring process, the viscosity and moisture content of the sludge are monitored by the viscosity probe and the humidity probe to ensure that the floc structure is effectively destroyed and the particles are evenly distributed. The stirred sludge is poured into the ultrasonic treatment equipment to destroy the water film bound to the particle surface and break up the particles through the cavitation effect; The sludge treated with ultrasound is mixed with a persulfate solution, and iron ions are added as a catalyst to generate sulfate radicals to oxidize and decompose the organic matter in the sludge; The chemical oxygen demand (COD) and the redox potential (ORP) in the reactor are monitored by a COD probe and an ORP probe, and an oxidation threshold is set. When the oxidation value reaches the oxidation threshold, the addition of the reagent is stopped to obtain the pretreated sludge; It improves the dispersibility and dewatering performance of sludge, reduces energy consumption in subsequent processes, improves overall processing efficiency, and provides a uniform and stable material basis for subsequent steps.

[0021] S2. The pretreated sludge is discharged from free water and interstitial water through an intelligent pressure maintenance and pressure relief control mechanism, and then microwave-assisted heating is performed using a continuous low-temperature sludge dryer to adjust microwave power and heating time to deeply remove bound water and interstitial water; The pretreated sludge is sent to the intelligent pressure-maintaining equipment for gradual pressurization. A multi-stage pressure control method is adopted, and the circulating fan, main fan and independent compressor are used to gradually increase the pressure inside the intelligent pressure-maintaining equipment, discharge free water and interstitial water, and monitor the moisture content of the sludge through a humidity probe; According to the moisture content of the pretreated sludge, a dynamic pressure-maintaining control formula is constructed to adjust the pressure-maintaining pressure. The expression is: ; in, Indicates at time The holding pressure at Indicates the maximum holding pressure value (set according to the sludge characteristics, the range is 0.8 MPa), represents the adjustment parameter (used to adjust the sensitivity of the formula to ensure that the water content is reduced without increasing the pressure excessively), represents the initial moisture content, Indicates at time The residual moisture content at After pressurization is completed, the pressure is gradually released at a set rate through the pressure relief operation; The sludge after pressure maintenance and pressure relief treatment is cut into strips by a strip cutting device, and then sent to the drying area by a conveying device. The evaporator, condenser and fin heat regenerator are used to maintain a closed-loop dehumidification and drying environment in the drying area; During the drying process, microwaves are used to heat the moisture inside the sludge, and the temperature and moisture content of the sludge are monitored by humidity and temperature probes; According to the monitored sludge moisture content and temperature, the microwave power and heating time are dynamically adjusted using the microwave power dynamic control formula, which is expressed as: ; in, Indicates at time The microwave power at represents the initial microwave power, Indicates at time The change of sludge moisture content ( ), represents the target optimized moisture content, represents the temperature control sensitivity coefficient, Indicates at time The sludge temperature at represents the target microwave heating temperature; After microwave-assisted heating, the bound water and interstitial water in the sludge are deeply removed, and the moisture content is reduced to the set target range; The sludge moisture content is significantly reduced, avoiding the problem of traditional mechanical dehydration methods being difficult to completely remove bound water, improving the quality of the final product, while reducing energy consumption and creating favorable conditions for subsequent pyrolysis carbonization.

[0022] S3, subjecting the microwave-assisted heated sludge to pyrolysis and carbonization through an indirect heating reactor, so as to convert organic matter in the sludge into pyrolysis products; The transmission channel is constructed of anti-sticking woven mesh and stainless steel mesh. The transmission channel is driven by the main transmission shaft and the slave transmission shaft to transfer the sludge after microwave-assisted deep dehydration from the continuous low-temperature sludge dryer to the indirect heating reactor. The moisture content and temperature of the sludge are monitored by humidity probes and temperature probes. In the reactor, the reactor jacket is indirectly heated by an external heat source to raise the temperature of the sludge in the reactor to the target temperature of the pyrolysis reaction; During the pyrolysis carbonization process, the organic matter in the sludge is decomposed into biochar, pyrolysis gas and tar; The pyrolysis reaction temperature, gas product concentration, initial external heating heat flow and biochar carbon content were monitored by temperature control probes, pyrolysis gas sensors and biochar detection equipment; According to the monitored pyrolysis reaction temperature, gas product concentration, initial external heat flow and biochar carbon content, a dynamic heat flow control model for pyrolysis temperature is constructed to dynamically adjust the heat flow of the external heat source. The expression is: ; in, Indicates at time The actual heating heat flow is represents the initial external heating heat flow, represents the gas concentration control coefficient, Indicates at time The actual gas concentration produced by pyrolysis is represents the target pyrolysis gas concentration, represents the base of natural logarithm, represents the temperature control sensitivity coefficient, Indicates at time The actual pyrolysis reaction temperature is represents the target pyrolysis reaction temperature, Indicates at time The actual amount of biochar generated is represents the target biochar content, represents the biochar regulation coefficient; when > When , the heat flow is increased to compensate for the lack of reaction; when = When , the current heating heat flow remains unchanged; when < When the temperature is too low, the heat flow is reduced to avoid overheating; It achieves efficient conversion of organic matter in sludge, produces high value-added biochar, pyrolysis gas and tar, reduces carbon emissions and environmental pollution risks, and lays the foundation for maximizing resource recovery.

[0023] S4, release the waste heat through the pyrolysis furnace, use the heat exchange equipment to recover the heat in the high-temperature flue gas, and use the heat in the high-temperature flue gas in different links of the front-end process; The high-temperature flue gas discharged from the indirect heating reactor enters the external cooler, where it exchanges heat with the cold water required for the sludge pretreatment stage. The cold water is heated to become hot water and is used to adjust the temperature of the sludge during the mixing process. The medium-temperature flue gas treated by the external cooler is discharged into the condenser, and the medium-temperature flue gas exchanges heat with the cold air in the continuous low-temperature sludge dryer. The cold air is heated to form dry hot air and is used in the sludge drying process; The low-temperature flue gas treated by the condenser is discharged into the fin heat regenerator, and the low-temperature flue gas exchanges heat with the sludge before entering the indirect heating reactor, which is used for the preheating process of the sludge before entering the indirect heating reactor; The flue gas inlet temperature, flue gas outlet temperature and recovered heat are collected through heat probes and temperature probes; According to the collected flue gas inlet temperature, flue gas outlet temperature and recovered heat, a dynamic heat recovery and distribution control formula is constructed to adjust the heat transfer efficiency of high-temperature flue gas in the pyrolysis process in real time. The expression is: ; in, Indicates at time The actual heat recovery amount at is the maximum heat recovery value, Indicates at time The temperature of the high-temperature flue gas entering the heat exchanger is Indicates at time The flue gas temperature discharged from the heat exchanger is The optimal temperature difference for target heat transfer, is the heat transfer efficiency control coefficient; For the optimal temperature difference of target heat transfer, when When, it means at time The heat transfer efficiency is highest when when ≥ When , it means that the heat recovery efficiency is high and there is no need to optimize the operating status of the heat exchanger; when < When , it means that the heat recovery efficiency is low, and the operating state of the heat exchanger is optimized by adjusting the flow ratio between the high-temperature flue gas and the cold fluid; It effectively solves the problem of heat recovery from high-temperature flue gas, improves the energy efficiency of the system, reduces energy waste, realizes energy recycling, and reduces overall operating costs.

[0024] S5. Through purification and separation processes, the pyrolysis products are classified and collected, and the optimal resource utilization path is selected according to the characteristics of the pyrolysis products; The pyrolysis gas generated by pyrolysis is purified by a fin heat regenerator combined with a pulse dust removal filter, and high-purity hydrogen is extracted from the pyrolysis gas using membrane separation technology as industrial clean energy; The biochar generated by pyrolysis is screened and graded according to particle size distribution and ash content. Large-particle biochar is used as a soil conditioner, and small-particle biochar is activated to become activated carbon. The tar generated by pyrolysis is separated from other liquids by a centrifuge, and the separated tar is sent to a refinery for further processing to produce asphalt; It ensures the refined classification and collection of pyrolysis products and their efficient resource utilization, solves the problem of lack of utilization paths for pyrolysis products in the prior art, promotes the comprehensive recovery and reuse of resources, and enhances the economic benefits and environmental friendliness of the system.

[0025] This embodiment also provides a high-efficiency sludge deep dehydration coupled resource utilization system, including: a pretreatment module, an intelligent dehydration module, a pyrolysis carbonization module, a waste heat recovery module and a product recovery module: Pretreatment module for pretreatment of sludge using agitation equipment, ultrasonic treatment and advanced oxidation technology; Intelligent dehydration module, used to deeply remove free water, interstitial water and bound water in sludge by using intelligent pressure maintenance and pressure relief control mechanism and microwave-assisted heating; Pyrolysis carbonization module, used to convert the dehydrated sludge into valuable biochar, pyrolysis gas and tar through pyrolysis carbonization; Waste heat recovery module, used to recover heat from high-temperature flue gas and distribute it reasonably to the front-end process; The product recovery module is used to classify, collect and purify the pyrolysis products, and select the optimal resource utilization path based on their characteristics.

[0026] This embodiment also provides a computer device, which is suitable for the case of a high-efficiency sludge deep dehydration coupled resource utilization method, including: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the high-efficiency sludge deep dehydration coupled resource utilization method proposed in the above embodiment.

[0027] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covered on the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0028] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for realizing high-efficiency sludge deep dehydration coupled with resource utilization proposed in the above embodiment is implemented; the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0029] In summary, the present invention significantly improves the efficiency and quality of sludge treatment through: a series of innovative technologies; the special stirring equipment combines ultrasound and advanced oxidation technology to optimize the physical and chemical properties of sludge and reduce the energy consumption of subsequent processes; the intelligent pressure maintenance and pressure relief mechanism and the microwave-assisted heating of the low-temperature dryer deeply remove free water, interstitial water and bound water, and reduce the moisture content of the final product; the indirect heating reactor efficiently converts organic matter to generate high-value-added biochar, pyrolysis gas and tar, and reduces carbon emissions; the waste heat recovery system improves energy efficiency, reduces energy waste, and realizes energy recycling; the purification and separation process ensures the refined classification and efficient resource utilization of pyrolysis products, enhances economic benefits and environmental friendliness; overall, the present invention improves treatment efficiency, reduces energy consumption and environmental pollution risks, and realizes maximum resource recovery.

Claims

1. A high-efficiency sludge deep dehydration coupled resource utilization method, characterized by: include, The sludge is stirred by a stirring device, and the stirred sludge is pretreated by ultrasonic and advanced oxidation technology to obtain pretreated sludge; The pretreated sludge is discharged with free water and interstitial water through the intelligent pressure maintenance and pressure relief control mechanism, and then microwave-assisted heating is performed using a continuous low-temperature sludge dryer to adjust the microwave power and heating time to deeply remove bound water and interstitial water; The microwave-assisted heated sludge is pyrolyzed and carbonized by an indirect heating reactor to convert organic matter in the sludge into pyrolysis products; The waste heat is released by the pyrolysis furnace, and the heat in the high-temperature flue gas is recovered by heat exchange equipment, and the heat in the high-temperature flue gas is used in different links of the front-end process; Through purification and separation processes, the pyrolysis products are collected and classified, and the optimal resource utilization path is selected according to the characteristics of the pyrolysis products.

2. The high-efficiency sludge deep dehydration coupled resource utilization method according to claim 1 is characterized by: The sludge is stirred by a stirring device, and the stirred sludge is pretreated by ultrasonic wave and advanced oxidation technology to obtain pretreated sludge, and the specific steps are as follows: The double-shaft stirring device in the buffer hopper is driven by a helical gear reducer to stir the sludge. During the stirring process, the viscosity and moisture content of the sludge are monitored by a viscosity probe and a humidity probe. The stirred sludge is poured into the ultrasonic treatment equipment to destroy the water film bound to the particle surface and break up the particles through the cavitation effect; The sludge treated with ultrasound is mixed with a persulfate solution, and iron ions are added as a catalyst to generate sulfate radicals to oxidize and decompose the organic matter in the sludge; The chemical oxygen demand (COD) and the redox potential (ORP) in the reactor are monitored by a COD probe and an ORP probe, and an oxidation threshold is set. When the oxidation value reaches the oxidation threshold, the addition of the reagent is stopped to obtain the pretreated sludge.

3. The high-efficiency sludge deep dehydration coupled resource utilization method according to claim 2 is characterized in that: The pretreated sludge is discharged with free water and interstitial water through an intelligent pressure maintenance and pressure relief control mechanism, and the specific steps are as follows: The pretreated sludge is sent to the intelligent pressure-maintaining equipment for gradual pressurization. A multi-stage pressure control method is adopted, and the circulating fan, main fan and independent compressor are used to gradually increase the pressure inside the intelligent pressure-maintaining equipment, discharge free water and interstitial water, and monitor the moisture content of the sludge through a humidity probe; According to the moisture content of the pretreated sludge, a dynamic pressure-maintaining control formula is constructed to adjust the pressure-maintaining pressure. The expression is: ； in, Indicates at time The holding pressure at Indicates the maximum holding pressure value. represents the adjustment parameter, represents the initial moisture content, Indicates at time The residual moisture content at After pressurization is completed, the pressure is gradually released at a set rate through the pressure relief operation.

4. The high-efficiency sludge deep dehydration coupled resource utilization method according to claim 3 is characterized by: Then, a continuous low-temperature sludge drying machine is used for microwave-assisted heating, and the microwave power and heating time are adjusted to deeply remove bound water and interstitial water. The specific steps are as follows: The sludge after pressure maintenance and pressure relief treatment is cut into strips by a strip cutting device, and then sent to the drying area by a conveying device. The evaporator, condenser and fin heat regenerator are used to maintain a closed-loop dehumidification and drying environment in the drying area; During the drying process, microwaves are used to heat the moisture inside the sludge, and the temperature and moisture content of the sludge are monitored by humidity and temperature probes; According to the monitored sludge moisture content and temperature, the microwave power and heating time are dynamically adjusted using the microwave power dynamic control formula, which is expressed as: ； in, Indicates at time The microwave power at represents the initial microwave power, Indicates at time The change of sludge moisture content at represents the target optimized moisture content, represents the temperature control sensitivity coefficient, Indicates at time The sludge temperature at represents the target microwave heating temperature; After microwave-assisted heating, the bound water and interstitial water in the sludge were deeply removed, and the moisture content was reduced to the set target range.

5. The high-efficiency sludge deep dehydration coupled resource utilization method according to claim 4 is characterized in that: The microwave-assisted sludge is subjected to pyrolysis and carbonization by an indirect heating reactor to convert organic matter in the sludge into pyrolysis products. The specific steps are as follows: The transmission channel is constructed of anti-sticking woven mesh and stainless steel mesh. The transmission channel is driven by the main transmission shaft and the slave transmission shaft to transfer the sludge after microwave-assisted deep dehydration from the continuous low-temperature sludge dryer to the indirect heating reactor. The moisture content and temperature of the sludge are monitored by humidity probes and temperature probes. In the reactor, the reactor jacket is indirectly heated by an external heat source to raise the temperature of the sludge in the reactor to the target temperature of the pyrolysis reaction; During the pyrolysis carbonization process, the organic matter in the sludge is decomposed into biochar, pyrolysis gas and tar; The pyrolysis reaction temperature, gas product concentration, initial external heating heat flow and biochar carbon content were monitored by temperature control probes, pyrolysis gas sensors and biochar detection equipment; According to the monitored pyrolysis reaction temperature, gas product concentration, initial external heat flow and biochar carbon content, a dynamic heat flow control model for pyrolysis temperature is constructed to dynamically adjust the heat flow of the external heat source. The expression is: ； in, Indicates at time The actual heating heat flow is represents the initial external heating heat flow, represents the gas concentration control coefficient, Indicates at time The actual gas concentration produced by pyrolysis is represents the target pyrolysis gas concentration, represents the base of natural logarithm, represents the temperature control sensitivity coefficient, Indicates at time The actual pyrolysis reaction temperature is represents the target pyrolysis reaction temperature, Indicates at time The actual amount of biochar generated is represents the target biochar content, represents the biochar regulation coefficient; when > When , the heat flow is increased to compensate for the lack of reaction; when = When , the current heating heat flow remains unchanged; when < When the temperature is too low, the heat flow is reduced to avoid overheating.

6. The high-efficiency sludge deep dehydration coupled resource utilization method according to claim 5 is characterized by: The waste heat is released by the pyrolysis furnace, the heat in the high-temperature flue gas is recovered by the heat exchange equipment, and the heat in the high-temperature flue gas is used in different links of the front-end process. The specific steps are as follows: The high-temperature flue gas discharged from the indirect heating reactor enters the external cooler, where it exchanges heat with the cold water required for the sludge pretreatment stage. The cold water is heated to become hot water and is used to adjust the temperature of the sludge during the mixing process. The medium-temperature flue gas treated by the external cooler is discharged into the condenser, and the medium-temperature flue gas exchanges heat with the cold air in the continuous low-temperature sludge dryer. The cold air is heated to form dry hot air and is used in the sludge drying process; The low-temperature flue gas treated by the condenser is discharged into the fin heat regenerator, and the low-temperature flue gas exchanges heat with the sludge before entering the indirect heating reactor, which is used for the preheating process of the sludge before entering the indirect heating reactor; The heat probe and temperature probe are used to collect the flue gas inlet temperature, flue gas outlet temperature and recovered heat; According to the collected flue gas inlet temperature, flue gas outlet temperature and recovered heat, a dynamic heat recovery and distribution control formula is constructed to adjust the heat transfer efficiency of high-temperature flue gas in the pyrolysis process in real time. The expression is: ； in, Indicates at time The actual heat recovery amount at is the maximum heat recovery value, Indicates at time The temperature of the high-temperature flue gas entering the heat exchanger is Indicates at time The flue gas temperature discharged from the heat exchanger is The optimal temperature difference for target heat transfer, is the heat transfer efficiency control coefficient; Said For the optimal temperature difference of target heat transfer, when When, it means at time The heat transfer efficiency is highest when when ≥ When , it means that the heat recovery efficiency is high and there is no need to optimize the operating status of the heat exchanger; when < When , it indicates that the heat recovery efficiency is low. The operating state of the heat exchanger is optimized by adjusting the flow ratio between the high-temperature flue gas and the cold fluid.

7. The high-efficiency sludge deep dehydration coupled resource utilization method according to claim 6, characterized in that: The purification and separation process is used to classify and collect the pyrolysis products, and the optimal resource utilization path is selected according to the characteristics of the pyrolysis products. The specific steps are: The pyrolysis gas generated by pyrolysis is purified by a fin heat regenerator combined with a pulse dust removal filter, and high-purity hydrogen is extracted from the pyrolysis gas using membrane separation technology as industrial clean energy; The biochar generated by pyrolysis is screened and graded according to particle size distribution and ash content. Large-particle biochar is used as a soil conditioner, and small-particle biochar is activated to become activated carbon. The tar generated by pyrolysis is separated from other liquids by a centrifuge and the separated tar is sent to a refinery for further processing to produce asphalt.

8. A high-efficiency sludge deep dehydration coupled resource utilization system, based on the high-efficiency sludge deep dehydration coupled resource utilization method according to any one of claims 1 to 7, characterized in that: Including pretreatment module, intelligent dehydration module, pyrolysis carbonization module, waste heat recovery module and product recovery module: The pretreatment module is used to pretreat the sludge by means of a stirring device, ultrasonic treatment and advanced oxidation technology; The intelligent dehydration module is used to deeply remove free water, interstitial water and bound water in sludge by using an intelligent pressure-maintaining and pressure-releasing control mechanism and microwave-assisted heating; The pyrolysis carbonization module is used to pyrolyze and carbonize the dehydrated sludge into valuable biochar, pyrolysis gas and tar; The waste heat recovery module is used to recover the heat in the high-temperature flue gas and reasonably distribute it to the front-end process; The product recovery module is used to classify, collect and purify the pyrolysis products and select the optimal resource utilization path according to their characteristics.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the high-efficiency sludge deep dehydration coupled resource utilization method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the high-efficiency sludge deep dehydration coupled resource utilization method described in any one of claims 1 to 7 are implemented.

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