Sludge drying circulating system
By using a sludge drying and recycling system, the steam and flue gas generated by waste incineration power generation are converted into heat, which solves the problem of high cost and low efficiency caused by multiple sludge drying equipment. It realizes the synergistic technology of sludge drying and waste incineration power generation, reduces the number of equipment and land occupation, and lowers costs and carbon dioxide emissions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI XINHONG SHUIYI ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-01-21
- Publication Date
- 2026-05-19
AI Technical Summary
Current sludge treatment methods require multiple heat source steps, leading to increased costs and lower efficiency. Existing sludge drying technologies also require various equipment, resulting in increased costs and lower efficiency. The current sludge drying technology involves numerous devices, leading to increased costs and lower efficiency.
A sludge drying and recycling system is provided, including a heat exchange device, a waste incineration power generation device, a sludge drying device, and a condensation device. The system converts steam and flue gas generated by the waste incineration power generation device into heat for sludge drying and condensation treatment, realizing a synergistic technology of sludge drying and waste incineration power generation, reducing the number of equipment and the footprint.
To achieve waste reduction, resource recovery, and harmless treatment, reduce dependence on non-renewable resources, lower carbon dioxide emissions, save investment and operating costs, improve steam drying efficiency, and reduce the number of equipment and land occupation.
Smart Images
Figure CN224258485U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sludge treatment technology, and more particularly to a sludge drying and recycling system. Background Technology
[0002] Sludge drying is a process that evaporates the water content from sludge through heat transfer. Common heat sources for sludge drying include coal, fuel oil, natural gas, and electricity. After drying, the sludge needs to be incinerated to remove harmful substances. This can be done alone or in co-incinerated with industrial kilns or power plants. However, the incineration process generates a large amount of flue gas, requiring additional equipment for its treatment and emission. Therefore, current sludge treatment methods involve many steps, necessitating extensive equipment, which increases costs and reduces efficiency. Utility Model Content
[0003] Therefore, it is necessary to provide a sludge drying and recycling system to address the aforementioned technical problems.
[0004] In a first aspect, embodiments of this application provide a sludge drying and recycling system, the sludge drying and recycling system comprising: a heat exchange device, a waste incineration power generation device, a sludge drying device, and a condensation device;
[0005] The waste incineration power generation unit is used to incinerate waste to generate steam and / or flue gas, and to transfer the steam and / or flue gas to the heat exchange unit;
[0006] The heat exchange device is used to collect the steam and / or flue gas generated by the waste incineration power generation device, and convert the steam and / or flue gas into heat and transfer it to the sludge drying device;
[0007] The sludge drying device is used to dry the sludge to be treated by the heat transferred through the heat exchange device, to obtain dried sludge, and then transfers the dried sludge to the waste incineration power generation device for incineration, and transfers the heat and the moisture generated during drying to the condensation device.
[0008] The condensing device is used to condense the heat and moisture transmitted by the sludge drying device and then transfer them to the heat exchange device.
[0009] As an optional implementation, in a first aspect of the embodiments of this application, the heat exchange device includes: a steam heat exchange device and a flue gas heat exchange device;
[0010] The heat exchange device is specifically used to convert the flue gas into heat and transfer it to the sludge drying device if the flue gas meets the heat requirements for drying the sludge to be treated.
[0011] The heat exchange device is specifically used to convert the steam and the flue gas into heat and transfer it to the sludge drying device if the flue gas does not meet the heat requirements for drying the sludge to be treated.
[0012] As an optional implementation, in the first aspect of the embodiments of this application, the sludge drying and recycling system further includes: a gas treatment device, which is connected to the heat exchange device and the waste incineration power generation device respectively;
[0013] The waste incineration power generation unit is specifically used to transmit the steam and / or flue gas to the gas treatment unit;
[0014] The gas treatment device is used to collect the steam and / or flue gas generated by the waste incineration power generation device, and to filter the steam and / or flue gas to obtain filtered steam and / or flue gas and harmful substances;
[0015] The gas treatment device is used to purify the harmful substances before discharging them;
[0016] The heat exchange device is specifically used to convert the filtered steam and / or flue gas into heat and transfer it to the sludge drying device.
[0017] As an optional implementation, in the first aspect of the embodiments of this application, the sludge drying and recycling system further includes: a finished product processing device, which is connected to the sludge drying device and the waste incineration power generation device respectively;
[0018] The sludge drying device is specifically used to transfer the dried sludge to the finished product processing device.
[0019] The finished product processing device is used to perform gas-solid separation on the dried sludge to obtain the dry sludge.
[0020] The finished product processing device is used to transport the dry sludge to the waste incineration power generation unit for incineration.
[0021] As an optional implementation, in a first aspect of the embodiments of this application, the sludge drying and recycling system further includes: a wastewater treatment device, wherein the wastewater treatment device and the sludge drying device are connected;
[0022] The wastewater treatment device is used to collect the wastewater generated when the sludge drying device dries the sludge to be treated, and to treat the wastewater before discharging it.
[0023] As an optional implementation, in the first aspect of the embodiments of this application, the sludge drying and recycling system further includes: a waste gas collection device, which is connected to the sludge drying device and the waste incineration power generation device respectively;
[0024] The waste gas collection device is used to collect the waste gas generated by the sludge drying device and transmit the waste gas to the boiler furnace of the waste incineration power generation device for incineration treatment.
[0025] As an optional implementation, in a first aspect of the embodiments of this application, the waste gas collection device is further used to treat the waste gas through preset emergency deodorization measures.
[0026] Compared with the prior art, the embodiments of this application have the following beneficial effects:
[0027] This application provides a sludge drying and recycling system, comprising: a heat exchange device, a waste incineration power generation device, a sludge drying device, and a condensation device; the waste incineration power generation device is used to incinerate waste to generate steam and / or flue gas, and transfers the steam and / or flue gas to the heat exchange device; the heat exchange device is used to collect the steam and / or flue gas generated by the waste incineration power generation device, and converts the steam and / or flue gas into heat, which is then transferred to the sludge drying device; the sludge drying device is used to dry the sludge to be treated using the heat transferred through the heat exchange device, obtaining dried sludge, and then transfers the dried sludge to the waste incineration power generation device for incineration, transferring the heat and moisture generated during drying to the condensation device; the condensation device is used to condense the heat and moisture transferred from the sludge drying device and then transfer it to the heat exchange device. This scheme utilizes a synergistic technology of sludge drying and waste-to-energy incineration to achieve waste reduction, resource recovery, and harmless treatment. The waste heat generated from the incineration of dried sludge is recycled for power generation, reducing reliance on non-renewable resources (such as coal, natural gas, or fuel oil) and thus reducing carbon dioxide emissions. Steam drying is relatively efficient, reducing the number of drying devices and resulting in a smaller overall footprint. This sludge drying and recycling system not only thoroughly treats sludge but also reuses the energy within it. By co-processing with a power plant, it utilizes waste heat from the thermal power plant as a drying heat source and leverages existing incineration and exhaust gas treatment equipment, saving on investment and operating costs. Attached Figure Description
[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a schematic diagram of the structure of a sludge drying and recycling system provided in an embodiment of this application. Figure 1 ;
[0031] Figure 2 This is a schematic diagram of the structure of a sludge drying and recycling system provided in an embodiment of this application. Figure 2 ;
[0032] Figure 3 This is a schematic diagram of the structure of a sludge drying and recycling system provided in an embodiment of this application. Figure 3 ;
[0033] Figure 4 This is a schematic diagram of the structure of a sludge drying and recycling system provided in an embodiment of this application. Figure 4 ;
[0034] Figure 5 This is a schematic diagram of the structure of a sludge drying and recycling system provided in an embodiment of this application. Figure 5 ;
[0035] Figure 6 This is a schematic diagram of the structure of a sludge drying and recycling system provided in an embodiment of this application. Figure 6 . Detailed Implementation
[0036] To better understand the above-mentioned objectives, features, and advantages of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of this application can be combined with each other. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0037] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, rather than to describe a specific order of objects.
[0038] The terms “comprising” and “having”, and any variations thereof, in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.
[0039] It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0040] The ideal goal of sludge treatment is to eliminate toxic and harmful substances from the sludge, preventing secondary pollution to humans and the environment. Sludge drying followed by incineration is the most effective sludge disposal method. Sludge drying is a process that evaporates the water content from the sludge through heat transfer. Sludge incineration includes standalone incineration and co-incineration with industrial kilns, power plants, etc. The following are some common heat sources for sludge drying:
[0041] Stationary fuel: Coal is a traditional, economical, and convenient heat source. China is a major coal producer with abundant reserves, and coal is easy to purchase, transport, and use at a low price, providing sufficient heat for sludge dryers. However, it should be noted that many provinces no longer allow the use of coal due to stricter environmental regulations.
[0042] Liquid fuel: fuel oil, which can be utilized through direct heating and indirect heating. Direct utilization involves using the hot air generated by the direct combustion of fuel oil in a fuel oil hot air furnace to dry materials; indirect utilization involves using flue gas to heat transfer oil or steam to dry materials. This method is less likely to contaminate materials and is also suitable for drying heat-sensitive materials that cannot be dried at high temperatures.
[0043] Gaseous fuels: Natural gas is a clean energy source with low pollution, meeting environmental protection requirements and being readily available. Although it is relatively more expensive than coal and fuel oil, it has fewer restrictions on its use, meets environmental standards, and is very convenient to use. Businesses near natural gas production areas can obtain natural gas at a lower price. Coal gas, similar to natural gas, is also a gaseous fuel option.
[0044] Heat carriers: (1) Steam: Clean and relatively economical, and can be used directly. Steam drying uses the heat energy of steam to exchange heat through the shell of a heat exchanger, evaporating the moisture in the sludge to dry it. Steam can be comprehensively recycled and is an ideal clean heat source. (2) Hot water: Hot water drying uses the heat energy of high-temperature hot water to exchange heat through a heat exchanger, evaporating the moisture in the sludge to dry it. This heat source is generally used for indirect drying of sludge, which requires higher heat exchangers. (3) Boiler flue gas: The temperature of boiler flue gas is generally between 120 and 200°C, containing huge heat energy, and is an ideal heat source for low-temperature drying of sludge. There are two forms of drying sludge using flue gas: direct heating and indirect heating. Biomass pellets: The raw materials for making biomass pellets are widely available and reasonably priced.
[0045] Electricity: Electricity is a relatively convenient heat source, but it is expensive.
[0046] Solar energy: Using solar energy as the primary energy source to dry sludge from wastewater treatment plants.
[0047] Biogas: It can be burned directly for heating, is inexpensive and relatively clean, but the supply is unstable.
[0048] When selecting a heat source for sludge drying, factors such as the availability, stability, cost, environmental requirements, and characteristics of the sludge must be considered. Furthermore, different heat sources may affect the selection and operating efficiency of sludge drying equipment; therefore, a comprehensive consideration based on the specific circumstances is necessary.
[0049] Sludge incineration refers to the process in which the combustibles in sludge react with oxygen in the air at high temperatures, causing all organic components to be oxidized and decomposed into stable inorganic substances, and recovering the energy generated by combustion. Sludge incineration is mainly divided into two categories: (1) using dewatered sludge directly incinerated in an incinerator; (2) drying dewatered sludge before incineration.
[0050] Sludge incineration requires sludge to have a high calorific value, therefore sludge is generally not digested. The biggest advantage of incineration is that it can rapidly and significantly reduce the volume and render the sludge harmless (through incineration, the volume reduction of sludge can reach about 95%; the high temperature generated by incineration can carbonize all organic matter and kill pathogens). Moreover, it does not require storage equipment under harsh weather conditions, can meet increasingly stringent environmental requirements, and can fully treat the portion of sludge that is not suitable for resource utilization.
[0051] Sludge incineration has advantages that other processes cannot replace: (1) all organic matter is carbonized during the incineration process, and pathogens and bacteria are completely killed; (2) sludge does not need to be stored for a long time and can be incinerated on-site; (3) sludge volume can be reduced rapidly and to a large extent (sludge volume is reduced by more than 60%), which greatly reduces the difficulty of subsequent sludge treatment and meets increasingly stringent environmental requirements.
[0052] Sludge incineration not only thoroughly disposes of sludge but also allows for the reuse of its energy. By co-processing with power plants, it can utilize waste heat from thermal power plants as a drying heat source and leverage existing incineration and exhaust gas treatment equipment, saving on investment and operating costs. The uses of incinerated sludge are as follows: It can be used as building materials, primarily for trench backfilling and road slag removal; after harmless treatment, it can be used for land application, mainly as base fertilizer for landscaping.
[0053] Sludge drying is a process that evaporates the water content from sludge through heat transfer. Common heat sources for sludge drying include coal, fuel oil, natural gas, and electricity. After drying, the sludge needs to be incinerated to remove harmful substances. This can be done alone or in co-incinerated with industrial kilns or power plants. However, the incineration process generates a large amount of flue gas, requiring additional equipment for its treatment and emission. Therefore, current sludge treatment methods involve many steps, necessitating extensive equipment, which increases costs and reduces efficiency.
[0054] To address some or all of the aforementioned technical problems, this application provides a sludge drying and recycling system, comprising: a heat exchange device, a waste incineration power generation unit, a sludge drying device, and a condensation device; the waste incineration power generation unit incinerates waste to generate steam and / or flue gas, and transfers the steam and / or flue gas to the heat exchange device; the heat exchange device collects the steam and / or flue gas generated by the waste incineration power generation unit, and converts the steam and / or flue gas into heat, which is then transferred to the sludge drying device; the sludge drying device uses the heat transferred through the heat exchange device to dry the sludge to be treated, obtaining dried sludge, and transfers the dried sludge to the waste incineration power generation unit for incineration, transferring the heat and moisture generated during drying to the condensation device; the condensation device condenses the heat and moisture transferred from the sludge drying device and then transfers it to the heat exchange device. This scheme utilizes a synergistic technology of sludge drying and waste-to-energy incineration to achieve waste reduction, resource recovery, and harmless treatment. The waste heat generated from the incineration of dried sludge is recycled for power generation, reducing reliance on non-renewable resources (such as coal, natural gas, or fuel oil) and thus reducing carbon dioxide emissions. Steam drying is relatively efficient, reducing the number of drying devices and resulting in a smaller overall footprint. This sludge drying and recycling system not only thoroughly treats sludge but also reuses the energy within it. By co-processing with a power plant, it utilizes waste heat from the thermal power plant as a drying heat source and leverages existing incineration and exhaust gas treatment equipment, saving on investment and operating costs.
[0055] like Figure 1 As shown, Figure 1 The present application provides a structural diagram of a sludge drying and recycling system, which includes: a heat exchange device 101, a waste incineration power generation device 102, a sludge drying device 103, and a condensation device 104.
[0056] Depend on Figure 1 It can be seen that the heat exchange device 101 is connected to the waste incineration power generation device 102, the sludge drying device 103 and the condensation device 104 respectively. The waste incineration power generation device 102 is connected to the heat exchange device 101 and the sludge drying device 103 respectively. The sludge drying device 103 is also connected to the heat exchange device 101, the waste incineration power generation device 102 and the condensation device 104 respectively. The condensation device 104 is connected to the heat exchange device 101 and the sludge drying device 103 respectively.
[0057] It should be noted that all of the above devices are connected by pipes.
[0058] The waste incineration power generation unit 102 is used to incinerate waste to generate steam and / or flue gas, and to transfer the steam and / or flue gas to the heat exchange unit 101.
[0059] The heat exchange device 101 is used to collect the steam and / or flue gas generated by the waste incineration power generation device 102 and convert the steam and / or flue gas into heat and transfer it to the sludge drying device 103.
[0060] The sludge drying device 103 is used to dry the sludge to be treated by the heat transferred through the heat exchange device 101, and the dried sludge is then transferred to the waste incineration power generation device 102 for incineration. The heat and the moisture generated during drying are transferred to the condensation device 104.
[0061] The condensing device 104 is used to condense the heat and moisture transmitted by the sludge drying device 103 and then transfer them to the heat exchange device 101.
[0062] It should be noted that the waste-to-energy incineration unit 102 can be installed in a waste-to-energy incineration plant. A waste-to-energy incineration plant is a facility that uses the heat energy generated from waste incineration to generate electricity. By incinerating waste at high temperatures, the chemical energy in the waste is converted into heat energy, which is then used to generate steam, driving a turbine to rotate, and ultimately powering a generator to produce electricity. The high-temperature flue gas generated from waste incineration undergoes heat exchange in a waste heat boiler, producing superheated steam. This steam is sent to a steam turbine generator set to drive the turbine, which in turn powers the generator to produce electricity. The flue gas and harmful substances generated during incineration are purified before being released.
[0063] In this embodiment, the flue gas and steam generated by the waste incineration power generation unit 102 incinerating waste contain a large amount of heat. The heat exchange device 101 can collect this flue gas and steam and convert it into heat, which is then transferred to the sludge drying device 103. The sludge drying device 103 uses the heat transferred from the heat exchange device 101 to dry the transported sludge to be treated. The dried sludge is then sent to the waste incineration power generation unit 102 for co-incineration to continue generating flue gas and steam. The remaining heat in the airflow and the moisture generated during drying are processed by the condenser 104, and the remaining heat is transferred to the heat exchange device 101 to enter the entire heat cycle to continue drying the sludge.
[0064] It can be seen that the sludge drying and recycling system provides a complete process for recycling the heat from sludge incineration. First, the flue gas and steam generated after the waste incineration power generation unit 102 incinerates the waste are converted into heat by the heat exchanger 101 and sent to the sludge drying unit 103 to dry the sludge. The dried sludge is then sent back to the waste incineration power generation unit 102 and incinerated as waste to generate flue gas and steam for recycling. The remaining heat and water generated during drying are processed by the condenser 104 and converted into heat, which is then returned to the heat exchanger 101 for recycling.
[0065] This application provides a sludge drying and recycling system. The sludge drying and waste-to-energy incineration technology can achieve waste reduction, resource recovery, and harmless treatment. Utilizing the waste heat generated from the incineration of dried sludge for power generation reduces reliance on non-renewable resources (such as coal, natural gas, or fuel oil), thereby reducing carbon dioxide emissions. Steam drying has relatively high efficiency, reducing the number of drying devices and resulting in a smaller overall footprint. This sludge drying and recycling system not only thoroughly treats sludge but also reuses the energy within it. By co-processing with a power plant, it can utilize waste heat from the thermal power plant as a drying heat source and leverage existing incineration and exhaust gas treatment equipment, saving on investment and operating costs.
[0066] In some embodiments, the heat exchange device 101 may specifically include: a steam heat exchange device 1011 and a flue gas heat exchange device 1012. For example, Figure 2 As shown, the steam heat exchanger 1011 can be used to convert the steam generated by the waste incineration power generation unit 102 into heat, and the flue gas heat exchanger 1012 can be used to convert the flue gas generated by the waste incineration power generation unit 102 into heat.
[0067] In some embodiments, the heat exchange device 101 is specifically used to convert the flue gas into heat and transfer it to the sludge drying device 103 if the flue gas meets the heat requirements for drying the sludge to be treated.
[0068] In some embodiments, the heat exchange device 101 is specifically used to convert steam and flue gas into heat and transfer them to the sludge drying device 103 through the steam heat exchange device 1011 and the flue gas heat exchange device 1012 respectively if the flue gas does not meet the heat requirements for drying the sludge to be treated.
[0069] It should be noted that since the flue gas produced by the waste incineration power generation unit 102 is limited, it may not be enough to dry the sludge to be treated. Therefore, heat can be generated by both steam and flue gas. Of course, if the flue gas meets the heat requirements for drying the sludge to be treated, then only the flue gas needs to be converted; if the flue gas meets the heat requirements for drying the sludge to be treated, then both steam and flue gas need to be converted.
[0070] In some embodiments, when the waste incineration power generation unit 102 is not incinerating waste, or the flue gas heat exchanger 1012 has not yet received the flue gas transmitted by the waste incineration power generation unit 102, the steam can be converted into heat and transmitted to the sludge drying unit 103 simply through the steam heat exchanger 1011.
[0071] In other words, in this sludge drying cycle system, sludge drying can be carried out using only the heat from flue gas conversion, or only the heat from steam conversion, or sludge drying can be carried out using the heat from both flue gas and steam conversion.
[0072] like Figure 3 As shown, Figure 3 This is a structural diagram of another sludge drying and recycling system provided in an embodiment of this application. The sludge drying and recycling system further includes a gas treatment device 105.
[0073] Depend on Figure 3 It can be seen that the gas processing device 105 is connected to the heat exchange device 101 and the waste incineration power generation device 102, respectively, through pipelines.
[0074] The waste incineration power generation unit 102 is specifically used to transfer steam and / or flue gas to the gas treatment unit 105.
[0075] The gas treatment device 105 is used to collect the steam and / or flue gas generated by the waste incineration power generation device 102, and to filter the steam and / or flue gas to obtain filtered steam and / or flue gas and harmful substances.
[0076] The gas treatment device 105 is used to purify harmful substances before discharging them.
[0077] The heat exchange device 101 is specifically used to convert the filtered steam and / or flue gas into heat and transfer it to the sludge drying device 103.
[0078] It should be noted that when the waste incineration power generation unit 102 incinerates waste, the flue gas produced may contain harmful substances generated from the waste. These harmful substances cannot be dried and need to be specially treated to be converted into compliant gases before being discharged. Therefore, a gas treatment device 105 can be installed between the waste incineration power generation unit 102 and the heat exchange device 101. The gas treatment device 105 is used to filter out the harmful substances generated during the incineration of waste incineration power generation unit 102, and to transfer the filtered safe vapor and / or flue gas to the heat exchange device 101 for purification of the harmful substances, which are then discharged after meeting the standards.
[0079] like Figure 4 As shown, Figure 4 This is a structural diagram of another sludge drying and recycling system provided in an embodiment of this application. The sludge drying and recycling system further includes a finished product processing device 106.
[0080] Depend on Figure 4 It can be seen that the finished product processing device 106 is connected to the sludge drying device 103 and the waste incineration power generation device 102 respectively, specifically through pipelines.
[0081] The sludge drying device 103 is specifically used to transfer the dried sludge to the finished product processing device 106.
[0082] The finished product processing device 106 is used to collect the dried sludge produced by the sludge drying device 103 and to perform gas-solid separation on the dried sludge to obtain dry sludge.
[0083] The finished product processing device 106 is used to transfer the dry sludge to the waste incineration power generation unit 102 for incineration.
[0084] It should be noted that after the sludge to be treated is dried by the sludge drying device 103, the dried sludge is carried by airflow into the finished product treatment device 106 for gas-solid separation. The separated dry sludge is temporarily stored in the finished product silo and then uniformly recycled to the waste incineration power generation device 102 for co-incineration to generate steam and flue gas again.
[0085] like Figure 5 As shown, Figure 5 This is a structural diagram of another sludge drying and recycling system provided in an embodiment of this application. The sludge drying and recycling system further includes a wastewater treatment device 107.
[0086] Depend on Figure 5 It can be seen that the sewage treatment device 107 and the sludge drying device 103 are connected, specifically, through pipes.
[0087] Wastewater treatment device 107 is used to collect wastewater generated by sludge drying device 103 during the drying process of sludge to be treated, and to treat the wastewater before discharging it.
[0088] It should be noted that the sludge drying device 103 dries the sludge to be treated, which can be understood as extracting the water from the sludge. Therefore, wastewater will inevitably be generated during the drying process. Thus, the wastewater generated during the drying process needs to be collected by the wastewater treatment device 107, treated uniformly, and discharged after meeting the standards.
[0089] like Figure 6 As shown, Figure 6 This is a structural diagram of another sludge drying and recycling system provided in an embodiment of this application. The sludge drying and recycling system further includes a waste gas collection device 108.
[0090] Depend on Figure 6 It can be seen that the waste gas collection device 108 is connected to the sludge drying device 103 and the waste incineration power generation device 102 respectively, specifically through pipelines.
[0091] The waste gas collection device 108 is used to collect the waste gas generated by the sludge drying device 103 and transmit the waste gas to the boiler furnace of the waste incineration power generation device 102 for incineration.
[0092] The exhaust gas collection device 108 is also used to treat exhaust gas through preset emergency deodorization measures.
[0093] It should be noted that the sludge drying device 103 may generate odor during the drying of the sludge to be treated. This odor cannot be directly emitted; it can be collected by the waste gas collection device 108 and then transported to the boiler furnace of the waste incineration power generation unit 102 for incineration. Alternatively, the waste gas collection device 108 can also directly treat the odor through preset emergency deodorization measures.
[0094] In summary, this embodiment utilizes waste-to-energy co-processing of dried sludge, avoiding the need for redundant construction of incineration and flue gas treatment systems and preventing the creation of new pollution sources in the city. Simultaneously, it fully utilizes the existing flue gas treatment system of the power plant, ensuring that the incinerated flue gas meets emission standards, resulting in significant environmental and social benefits. Eliminating the need for new incineration and flue gas treatment systems saves on project construction costs. Furthermore, the dried sludge products have a high calorific value, and after co-incineration with municipal solid waste, they can provide some fuel for the power plant, offering certain economic benefits.
[0095] The heat source for sludge drying can be steam and flue gas generated by waste incineration power plants, reducing energy consumption and lowering the heat energy consumption for sludge drying. The biggest advantage of using steam and flue gas for sludge drying projects is that the equipment has relatively high drying efficiency, which can reduce the number of drying devices and thus reduce the overall footprint.
[0096] The flue gas and steam from the waste-to-energy incineration plant provide heat energy for the sludge drying system. After drying, the sludge is transported to the power plant as fuel for co-incineration with municipal solid waste. This sludge drying recycling measure can achieve the following effects:
[0097] (1) It can provide a stable heat source for sludge drying equipment;
[0098] (2) Flue gas and steam are used as thermal energy for sludge, realizing the recycling of steam and the secondary utilization of waste gas;
[0099] (3) Flue gas and steam are used as heat energy for sludge, which completely solves the problem of insufficient heat from flue gas.
[0100] (4) The dried sludge is then transferred to a waste incineration power plant for incineration, where the energy in the sludge can be reused. This allows the use of flue gas and steam from the waste incineration power plant as a heat source for drying, as well as the use of the existing exhaust gas treatment equipment in the waste incineration power plant, thus saving investment and operating costs.
[0101] (5) This reduces the investment in the entire sludge drying system, minimizes the footprint, and saves energy and reduces emissions.
[0102] (6) Energy saving and emission reduction, greatly reducing the demand for electricity and upgrading the secondary utilization of waste.
[0103] (7) Reduction, resource recovery, and harmlessness. The synergistic technology of sludge drying and waste incineration power generation can achieve the reduction, resource recovery, and harmlessness of waste treatment, which meets the requirements of the circular economy;
[0104] (8) Reduce carbon dioxide emissions. Using the waste heat generated by incinerating dried sludge to generate electricity can reduce dependence on non-renewable resources (such as coal, natural gas or fuel oil), thereby reducing carbon dioxide emissions.
[0105] (9) Steam drying has the greatest advantage of relatively high drying efficiency, which can reduce the number of drying equipment and make the overall layout occupy less space.
[0106] (10) This technology has the advantages of low energy consumption, small footprint, high solid content in drying, and low initial investment in equipment.
[0107] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.
[0108] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.
[0109] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application. The above-mentioned multiple embodiments are not necessarily multiple independent embodiments; they are divided into multiple embodiments only to highlight different technical features in different embodiments. Those skilled in the art should understand that the above-mentioned multiple embodiments can also be combined arbitrarily.
[0110] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0111] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A sludge drying and recycling system, characterized in that, The sludge drying and recycling system includes: a heat exchange device, a waste incineration power generation device, a sludge drying device, and a condensation device; The waste incineration power generation unit is used to incinerate waste to generate steam and / or flue gas, and to transfer the steam and / or flue gas to the heat exchange unit; The heat exchange device is used to collect the steam and / or flue gas generated by the waste incineration power generation unit and convert the steam and / or flue gas into heat and transfer it to the sludge drying unit. The heat exchange device includes a steam heat exchange device and a flue gas heat exchange device. Specifically, if the flue gas meets the heat requirements for drying the sludge to be treated, the heat exchange device converts the flue gas into heat and transfers it to the sludge drying unit; and if the flue gas does not meet the heat requirements for drying the sludge to be treated, the heat exchange device converts the steam and the flue gas into heat and transfers them to the sludge drying unit, respectively. The sludge drying device is used to dry the sludge to be treated by the heat transferred through the heat exchange device, to obtain dried sludge, and then transfers the dried sludge to the waste incineration power generation device for incineration, and transfers the heat and the moisture generated during drying to the condensation device. The condensing device is used to condense the heat and moisture transmitted by the sludge drying device and then transfer them to the heat exchange device.
2. The sludge drying and recycling system according to claim 1, characterized in that, The sludge drying and recycling system also includes a gas treatment device, which is connected to the heat exchange device and the waste incineration power generation device respectively. The waste incineration power generation unit is specifically used to transmit the steam and / or flue gas to the gas treatment unit; The gas treatment device is used to collect the steam and / or flue gas generated by the waste incineration power generation device, and to filter the steam and / or flue gas to obtain filtered steam and / or flue gas and harmful substances; The gas treatment device is used to purify the harmful substances before discharging them; The heat exchange device is specifically used to convert the filtered steam and / or flue gas into heat and transfer it to the sludge drying device.
3. The sludge drying and recycling system according to claim 1, characterized in that, The sludge drying and recycling system also includes a finished product processing device, which is connected to the sludge drying device and the waste incineration power generation device respectively. The sludge drying device is specifically used to transfer the dried sludge to the finished product processing device. The finished product processing device is used to perform gas-solid separation on the dried sludge to obtain the dry sludge. The finished product processing device is used to transport the dry sludge to the waste incineration power generation unit for incineration.
4. The sludge drying and recycling system according to claim 1, characterized in that, The sludge drying and recycling system further includes: a wastewater treatment device, wherein the wastewater treatment device and the sludge drying device are connected; The wastewater treatment device is used to collect the wastewater generated when the sludge drying device dries the sludge to be treated, and to treat the wastewater before discharging it.
5. The sludge drying and recycling system according to claim 1, characterized in that, The sludge drying and recycling system also includes: a waste gas collection device, which is connected to the sludge drying device and the waste incineration power generation device respectively; The waste gas collection device is used to collect the waste gas generated by the sludge drying device and transmit the waste gas to the boiler furnace of the waste incineration power generation device for incineration treatment.
6. The sludge drying and recycling system according to claim 5, characterized in that, The waste gas collection device is also used to treat the waste gas through preset emergency deodorization measures.