A municipal sludge suspension drying and clean incineration equipment and incineration method

Abstract

A municipal sludge suspension drying and clean incineration equipment and incineration method, comprising a cylinder body, a sludge air-lock feeding mechanism, a rotating chain roller suction suspension drying mechanism, a suspension incineration mechanism and an exhaust gas purification device. The sludge air-lock feeding mechanism is arranged on the top or the upper side wall of the cylinder body, and the sludge air-lock feeding mechanism is communicated with the inside of the cylinder body. The bottom of the rotating chain roller suction suspension drying mechanism is communicated with the upper part of the suspension incineration mechanism. The air inlet of the exhaust gas purification device is communicated with the cylinder body. The device of the present invention operates reliably, occupies less land and requires less investment. The present invention also provides a sludge incineration method with a simple treatment process and high heat utilization efficiency, which can directly carry out on-site reduction treatment and direct harmless treatment on the sludge generated by sewage treatment plants or environmental protection enterprises.

Description

Technical Field

[0001] The present invention relates to an incineration device, in particular to a municipal sludge suspension drying and clean incineration equipment and an incineration method. Background Art

[0002] The moisture content of the primary (post-precipitation) sludge generated during the treatment of urban domestic sewage including some industrial wastewater by municipal sewage treatment plants is 90-99%. The moisture content of the dewatered sludge after dehydration by a belt filter press is about 80%. After the dewatered sludge is mixed with a ridge-forming material and further vacuum-filtered for deep dehydration, the moisture content can be reduced to about 60% (the cost of deep dehydration is as high as 200-480 yuan / t). Generally, when the moisture content of municipal sludge is dehydrated to 70%-84%, the sludge is in a plastic state. When the moisture content is dehydrated to 60%-65%, it is in a semi-solid state. When dried to a moisture content of 35%-45% (the moisture content of the products of a sludge drying plant is about 40%), it is in a solid state, that is, a semi-dried state. When dried to a moisture content of 10%-15%, it can become powdery.

[0003] Municipal dewatered sludge (with a moisture content of about 80%) is a semi-fluid or mud cake-like flocculant in grayish-black or dark brown color, which is a heterogeneous flocculated colloidal complex mixture composed of inorganic mud and sand and organic matter (such as fibers, plant and animal residues, and zoogloea formed by various microorganisms). The organic matter content is generally 48%-80%. And the organic matter therein has the characteristics of being mudified (i.e., being penetrated and structurally wrapped by the inorganic-mud components in the sludge and silicified / aluminized), high water content in the zoogloea, and high sulfur compounds. At the same time, the sludge contains heavy metals such as copper, arsenic, lead, zinc, chromium, cadmium, etc., and refractory organic and inorganic pollution components, is prone to corruption and odor, and generates malodorous gases such as hydrogen sulfide, mercaptan, thioether, indole, etc. It is likely to bring some relatively serious pollution problems, such as: (1) Toxic and odorous pollution of the ambient air. Municipal sludge is prone to generate odor during transportation, storage / inventory, drying, incineration or utilization; (2) Pathogenic microorganism pollution, including pathogenic microorganism and parasite pollution. There are mainly 4 types of harmful organisms in the sludge that can cause harm to the health of humans or other organisms or cause diseases: bacteria, viruses, protozoa, and parasites; (3) Heavy metal pollution. The heavy metals in the sludge are mainly Cd, Pb, As, Cr, Hg, Cu, Zn, Ni, etc. The types of heavy metals contained in the sludge in various regions of our country are generally the same, but their contents vary greatly. They can accumulate in animals and plants and endanger the human body and other organisms; (4) Organic polymer pollution, including benzene, chlorophenol, polychlorinated biphenyls (PCBs), polychlorinated dibenzofurans (PCDFs), and polychlorinated dibenzo-p-dioxins (PCDDs), etc., which can damage the organs and immune system of the human body; (5) Nutrient pollution such as N and P, causing eutrophication of surface water bodies and seeping into the ground to cause groundwater pollution.

[0004] With the development of the country's urbanization economy, the total amount of municipal sewage discharged in China reached nearly 608 million tons in 2019. The treatment capacity of the sewage treatment projects built in matching in China has also increased rapidly, and the sludge volume has also increased significantly synchronously. As of the end of February 2019, more than 4,500 sewage treatment plants had been built in cities at the municipal level across the country, with a sewage treatment capacity of 204 million cubic meters per day. The annual production of dewatered sludge with a water content of 80% reached more than 50 million tons (excluding more than 40 million tons of industrial sludge). Although the "Water Ten" stipulates that the harmless treatment and disposal rate of sludge in prefecture-level and above cities should reach more than 90% by the end of 2020. The Ministry of Housing and Urban-Rural Development has also clearly required that all localities should follow the sludge disposal technical route of "green, environmental protection, recycling, and low carbon", urge the implementation of the main responsibilities of the urban people's governments in planning and construction, reasonably select processes, and accelerate the construction of facilities. However, due to the characteristics of municipal sludge, at least 70% of the sludge produced by sewage treatment plants in China has not been properly treated, and the pollution and re-pollution problems caused by sludge transportation, dumping, landfill, or random stacking have emerged and attracted social attention.

[0005] Currently, there are many domestic and foreign municipal sludge harmless treatment technologies or methods. Excluding technologies with relatively small scales or still in the experimental stage, such as using sludge as a binder, extracting gold from sludge, mixing sludge to make water coal slurry, sludge pyrolysis gasification, the supercritical oxidation technology of sludge, the technology of making adsorbents from sludge, etc., their large-scale applications can be generally summarized as follows:

[0006] 1. Sanitary landfill. This method is simple, easy to implement, and low in cost. However, objectively, the generation of landfill leachate and odorous gases will pollute the groundwater environment and affect the atmospheric environment within dozens of kilometers around. There has been legislation in Europe to prohibit sludge landfill.

[0007] 2. Making agricultural fertilizers from sludge. This method has low investment and high profits, but requires a large site, is difficult to use at the sludge production source, is prone to secondary pollution during transportation, and is prone to problems such as land hardening and excessive heavy metal content.

[0008] 3. Ocean disposal. That is, dumping sludge into the ocean. Due to its impact on the marine ecological environment, it has attracted worldwide attention, and sludge dumping into the sea has been prohibited by most countries.

[0009] 4. Making building materials products from sludge. Sludge is used for burning bricks, making lightweight materials such as ceramsite, and making biochemical fiberboards, etc. Due to the difficulty in solving problems such as peculiar smells during the process of using sludge, most of them have been discontinued now.

[0010] 5. Anaerobic digestion of sludge to produce biogas. Anaerobic digestion of sludge further degrades and utilizes the organic matter in the sludge, which can reduce part of the sludge volume, but it is very limited and is prone to secondary pollution.

[0011] 6. Sludge reduction and drying technology. Convective heat transfer direct drying technology, conductive heat transfer indirect drying technology, radiation drying technology and combined drying technology are used to reduce the amount of sludge, but they have high energy consumption and it is difficult to treat the odor of exhaust gas.

[0012] 7. Sludge incineration technology. Sludge incineration treatment is currently recognized as the most thorough method for harmless treatment of sludge, which is divided into co-incineration and separate incineration. Co-incineration is to use the existing incineration equipment of enterprises such as cement plants, waste incineration plants and thermal power plants for incineration, but it will affect the output and energy consumption of the enterprise itself. At the same time, environmental pollution is easily caused during the transportation, storage and treatment of sludge, affecting air quality; separate incineration is to use incinerators such as sludge atomization injection incinerators, vertical multi-stage incinerators, fluidized bed incinerators, rotary kiln incinerators, grate-type incinerators, electric heating infrared incinerators, melting furnaces, plasma torch incinerators, etc. to incinerate sludge alone, but there are problems such as large floor area, complex process, low burnout rate of sludge residue, high energy consumption, low thermal efficiency, or extremely difficult treatment of pollutants in exhaust gas.

[0013] Among the above separate incineration technologies, the plasma torch sludge waste incineration device technology of a certain company is currently recognized as the most advanced technology. It uses a combination of "plasma torch (200kW drying and cracking), plasma torch incinerator (700 - 900°C), water filtration device, secondary combustion chamber, waste heat recovery device, spray quenching device, flue gas treatment device" to treat sludge. The main problems are: First, it has a large application floor area, complex process flow, many functional main equipment required, large investment, and is not very suitable for use at the sludge production source such as sewage treatment plants. Second, the sludge is dried and cracked in an oxygen-deficient atmosphere designed, and the drying, cracking and final incineration all rely on the plasma torch, with high power consumption and high treatment cost. Third, after the high-temperature flue gas mainly generated by electric energy recovers part of the waste heat through the waste heat boiler, a spray quenching device is still needed to quickly cool the flue gas from 800°C to below 180°C, so as to facilitate the removal of acidic substances (including sulfur dioxide) from the flue gas and bag dust collection. The energy utilization efficiency is low and a large amount of thermal pollution is generated.

[0014] To sum up, although the harmless, resource-based or energy-based treatment technologies of municipal sludge in China have developed rapidly, they are not yet sufficient to effectively solve the problem of harmless treatment of a large amount of sludge generated by sewage treatment plants in China. As a result, at least 70% of the sludge has not been properly treated, especially there is no reliable technical solution to solve the pollution and re-pollution problems caused by the leakage, dumping, landfill or random stacking of a large amount of wet sludge during transportation. Therefore, there is an urgent need for a brand-new method and equipment with a relatively small floor area, small investment, reliable operation, low cost, no secondary pollution diffusion, and suitable for direct or nearby harmless treatment of dewatered sludge with a moisture content of about 80% by municipal sewage treatment plants or enterprises generating sludge. Summary of the Invention

[0015] The technical problem to be solved by the present invention is to overcome the above-mentioned defects existing in the prior art and provide a municipal sludge suspension drying and clean incineration equipment that uses the organic matter in municipal sludge as the main energy source, operates reliably, and has no secondary pollution.

[0016] The further technical problem to be solved by the present invention is to overcome the above-mentioned defects existing in the prior art and provide a municipal sludge suspension drying and clean incineration method with a simple treatment process and high heat utilization efficiency.

[0017] The technical solution adopted by the present invention to solve its technical problems is: a municipal sludge suspension drying and clean incineration equipment, mainly including a cylinder body, a sludge air-lock feeding mechanism, a rotary chain roller pumping suspension drying mechanism, a suspension incineration mechanism, and an exhaust gas purification device. The sludge air-lock feeding mechanism is arranged on the top or upper side wall of the cylinder body, and the sludge air-lock feeding mechanism is communicated with the inside of the cylinder body. The rotary chain roller pumping suspension drying mechanism and the suspension incineration mechanism are arranged inside the cylinder body. The bottom of the rotary chain roller pumping suspension drying mechanism is communicated with the upper part of the suspension incineration mechanism. The air inlet of the exhaust gas purification device is communicated with the inside of the cylinder body.

[0018] Furthermore, the rotary chain roller pumping suspension drying mechanism mainly includes a main shaft, a throwing disc, a throwing chain, and a diversion lining plate. The main shaft is fixed at the central position of the cylinder body. The throwing disc is provided with multiple layers and is fixedly arranged on the main shaft at intervals. The throwing chain is arranged in a ring shape on the outer periphery of each throwing disc. The diversion lining plate is fixed on the inner side of the cylinder body and is used to forcibly change the movement trajectories of the sludge and air flow inside the cylinder body, so that the downwardly scattered sludge and the upward hot air flow reverse and fold in a "zigzag" shape between the diversion lining plate and the multiple layers of throwing discs. The main shaft drives the multiple layers of throwing discs and throwing chains to rotate and together with the diversion lining plate constitutes a rotary chain roller pumping suspension drying space for the sludge.

[0019] The multiple layers of throwing discs and the throwing chain fixedly arranged in a ring shape at the outer end of the throwing disc are used to rotate, disperse, and stir the sludge, and to crack the extremely difficult-to-dry crust sludge in which the surface has hardened due to dehydration shrinkage while the inside still contains relatively high moisture. This makes the sludge in a dynamic suspended state and mixed with hot gas, increasing the heat transfer area, enhancing the turbulence intensity, improving the heat exchange efficiency, accelerating the drying speed, reducing the drying heat consumption. At the same time, the heat energy generated by incinerating the sludge with a plasma flame is directly used to dry the sludge, and the heat utilization efficiency is high.

[0020] A unique flexible roller pumping suspension drying process is formed by structures such as multiple layers of throwing discs, a throwing chain fixedly arranged in a ring shape at the outer end of the throwing disc, and a diversion lining plate, to achieve rapid drying of the sludge.

[0021] Furthermore, the suspension incineration mechanism is arranged at the inner lower part or the lower conical part of the cylinder body. The suspension incineration mechanism mainly includes a plasma flame injector, a hot slag air-blowing cooling device and a blower. The hot slag air-blowing cooling device is arranged outside the lower part of the cylinder body or the lower conical part of the cylinder body. The hot slag air-blowing cooling device is connected to the inside of the cylinder body through a plurality of air outlet pipes or air caps or grates. The air inlet of the hot slag air-blowing cooling device is connected to the air outlet of the blower through a pipeline. The number of plasma flame injectors is several, and the plasma flame injectors are arranged on the side wall of the middle lower part or the lower conical part of the cylinder body. The inner side of the lower part and / or the lower conical part of the cylinder body is provided with a heat insulation layer and a heat-resistant and wear-resistant layer. A slag outlet is arranged at the bottom end of the lower conical part of the cylinder body or on the side wall of the lower part of the cylinder body; the heat-resistant and wear-resistant layer, the plasma flame injector and the hot slag air-blowing cooling device together constitute a suspension incineration space for dried sludge, and the high-temperature plasma flame is used for heating up and ensuring the temperature field for the full and clean combustion of dried sludge.

[0022] The high temperature generated by the plasma flame can completely and thoroughly decompose organic matter, with high combustion efficiency and no generation of dioxins and other harmful substances; the scattered wet sludge is used to adsorb most of the fly ash in the flue gas, and the high-moisture waste gas is used to adsorb fly ash to the waste gas purification device for sedimentation, realizing the clean treatment of sludge.

[0023] Furthermore, the throwing chains are distributed in one layer or multiple layers on the throwing disc, and the plasma flame injectors are distributed in one layer or multiple layers. The plasma flame injectors are preferably distributed in a circular tangential manner on the same layer, so that the plasma flame is distributed in a swirling flow in the suspension incineration space to improve the combustion efficiency and burnout rate.

[0024] Furthermore, the rotary chain-roll pumping suspension drying mechanism is also provided with a cleaning plow blade, and the cleaning plow blade is fixed on the main shaft or the throwing disc and is used for cleaning the sludge attached to the inner wall of the diversion lining plate, realizing the self-cleaning of the rotary chain-roll pumping suspension drying mechanism.

[0025] Furthermore, the rotary chain-roll pumping suspension drying mechanism is also provided with a power device, and the power device provides power for the rotation of the rotary chain-roll pumping suspension drying mechanism.

[0026] Furthermore, an auxiliary fuel feeding device is arranged on the side wall of the lower part or the lower conical part of the cylinder body, and the auxiliary fuel feeding device is connected to the incineration space. The auxiliary fuel feeding device is a gas / oil nozzle or a solid fuel feeding device or a combustible waste feeding device to reduce power consumption and co-process organic solid waste, and the gas / oil nozzle can also directly replace the plasma flame injector.

[0027] Further, the waste gas purification device is a waste gas condensate device or a waste gas catalytic purification device and a waste gas condensate device. The waste gas catalytic purification device is composed of at least one of a plasma flame catalytic purification device, a regenerative thermal oxidizer, and a catalytic oxidation purification furnace. The waste gas condensate device is composed of at least one of a cyclone condensate device, a wire mesh condensate device, a phase change condensation device, and a condensation water separation device. Among them, the phase change condensation device is a phase change condensation tower or a phase change condenser, and the condensation water separation device is a condensation water separation tower or a condensation water separator.

[0028] Further, the municipal sludge suspension drying and clean incineration equipment is also provided with an air extraction device. The air inlet of the air extraction device is communicated with the air outlet of the waste gas purification device to suck gas, so that both the rotary chain roller suction suspension drying space and the suspension incineration space are in a slightly negative pressure state.

[0029] Further, a slag discharging device is also provided. The slag discharging device is fixed at the bottom or the bottom side of the cylinder body to discharge the activated solid slag cooled by the hot slag air-blowing cooling device.

[0030] Further, a feeding device for liquid or solid additives (such as sludge odor purifying agent / micelle-breaking drying additive / catalytic or combustion-supporting agent / desulfurization and sulfur-fixing agent / heavy metal solidification promoting agent / alkalizing agent / denitrifying agent / ash slag activating agent, etc.) is also provided. The liquid or solid additive feeding device is arranged at the top or the side wall of the upper part of the cylinder body.

[0031] Further, a monitoring system is also provided. The monitoring system includes a temperature measuring instrument, a pressure measuring instrument, an on-line flue gas analyzer, a monitoring console, etc., and is used to monitor and control the working conditions and flue gas components of the drying and incineration processes.

[0032] Further, an explosion-proof and fire extinguishing control system is also provided.

[0033] Further, observation holes and manholes for observation or maintenance are also arranged on the side wall of the cylinder body.

[0034] The technical solution adopted by the present invention to further solve its technical problems is: a method for incinerating municipal sludge suspension drying and clean incineration equipment, including the following steps:

[0035] (1) The wet sludge (municipal sludge with a moisture content ≤ 90%, especially municipal dewatered sludge with a moisture content of about 80%) is fed into the rotary chain roller suction suspension drying space in the cylinder body by the sludge air-lock feeding mechanism or directly from the top / upper part of the cylinder body.

[0036] (2) The sludge that enters the rotary chain rolling and suspension drying space in large clusters is broken up under the rolling and pumping of the chain. It descends in a zigzag pattern between the guide lining plate and the multi-layered throwing plates. During the descent, it is dynamically suspended, stirred, and mixed with the non-reducing hot gas at 750 °C to 1100 °C generated by the upward plasma flame injector for incinerating and drying the sludge, achieving rapid dehydration. At the same time, during the descent, the chain whips the crusty sludge that is extremely difficult to dry, where the surface has formed a crust and hardened due to dehydration shrinkage but the interior still contains relatively high moisture. This causes the crusty sludge to crack and disperse, exposing the high-moisture sludge inside and bringing it into direct contact with the hot gas for rapid dehydration until the sludge is dried into loose fine granular form and scattered into the suspension incineration space.

[0037] (3) Under the combustion-supporting effect of the preheated air generated by the cooling residue blown in by the hot slag air-blowing cooling device, the fine granular dried sludge is ignited by the high-temperature plasma flame and burns completely in a fluidized state in an oxidizing atmosphere at 900 °C to 1380 °C. This provides most of the heat energy required for drying the wet sludge. During the high-temperature plasma flame oxidation combustion, dioxins and hydrocarbon volatile compounds can be completely eliminated. The inorganic minerals in the sludge thermally decompose and then chemically combine at high temperature to form aluminosilicate minerals with certain potential hydraulic activity. At the same time, during the high-temperature thermal chemical reaction, heavy metal ions are melted and solidified by silicate groups and / or aluminate groups and / or aluminosilicate groups at high temperature. These aluminosilicate minerals become active solid slag after cooling and can be directly used to manufacture building materials or as active admixtures. The high-temperature incineration exhaust gas generated ascends into the rotary chain rolling and suspension drying space to dry the wet sludge and then is converted into low-temperature and high-moisture exhaust gas and discharged into the exhaust gas purification device.

[0038] (4) The exhaust gas is discharged up to standard after catalytic purification. The condensed water generated (the impurities contained are non-toxic inorganic substances) can be directly discharged into the sewage treatment plant or discharged after filtering out the inorganic ash residues.

[0039] Further, to destroy the bacterium mass gel water retention and flocculation mechanism of the sludge, improve the dehydration and drying efficiency, and / or improve the combustion performance of the organic matter silted and the organic matter of the high internal water bacterium mass in the sludge, reduce the energy consumption of sludge drying and incineration, and improve the sludge treatment efficiency, a micelle-breaking drying agent with the above functional effects can be added to the wet sludge in any mass ratio. The commercially available micelle-breaking drying agent is preferably a micelle-breaking drying agent mainly composed of strong oxidants such as ferrate and ion interference agents, and the dosage is 0.25% to 0.75% of the mass ratio of the wet sludge.

[0040] Further, for sludge with a relatively high sulfur content or a relatively high heavy metal content, in order to improve the sulfur fixation effect, a desulfurization and sulfur fixation agent can be added to the wet sludge or during the incineration process; in order to strengthen the effect of heavy metal lattice solidification, a heavy metal solidification promoter can be added to the wet sludge or during the incineration process. The dosage of the desulfurization and sulfur fixation agent is 0.2-0.5% of the mass of the wet high-sulfur sludge, and the dosage of the heavy metal solidification promoter is 0.1-0.4% of the mass of the wet sludge.

[0041] Further, in order to improve the activity of the incinerated solid ash, an ash activator can be added to the wet sludge or during the incineration process. The ash activator is a calcareous material (such as lime, etc.) and / or a silico-aluminous material (such as silico-aluminous waste residue, bauxite, etc.) and / or an iron-containing material (such as iron oxide powder, etc.).

[0042] Further, in order to improve the resource utilization and energy utilization rate of organic solid waste, an appropriate amount of one or more of shredded domestic waste, shredded garden wood waste, shredded rubber waste, shredded agricultural waste, and waste oil can be added to the wet sludge or during the incineration process, or other waste materials containing fuel and / or organic matter can also be added.

[0043] The device process of the present invention is simple, has a high heat utilization efficiency, is reliable in operation, occupies less land, and requires less investment. The incineration method provided by the present invention directly performs on-site reduction treatment and direct harmless treatment on the sludge generated by sewage treatment plants or environmental protection enterprises, realizes the source reduction of sludge, avoids secondary pollution to the environment during the stacking or transportation of sludge, and at the same time, the active solid slag generated by drying and incineration can be directly used as building material raw materials or as active admixtures for building material enterprises such as cement plants, cement grinding stations, concrete mixing stations, and brick factories, realizing the resource utilization of sludge. Description of the Drawings

[0044] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0045] Figure 2 is Figure 1 a schematic structural diagram of the throwing disc and the throwing chain in Embodiment 1 shown;

[0046] Figure 3 is Figure 1 a schematic structural diagram of the cleaning plow knife in Embodiment 1 shown;

[0047] Figure 4 is Figure 1 a schematic layout diagram of the plasma flame injector in Embodiment 1 shown;

[0048] Figure 5 is Figure 1 a schematic structural diagram of the cyclone tube in Embodiment 1 shown;

[0049] Figure 6 Structural schematic diagram of Embodiment 2 of the present invention;

[0050] Figure 7 is Figure 6 Structural schematic diagram of the distribution of the material throwing disc and the throwing chain in the shown Embodiment 2;

[0051] Figure 8 is Figure 6 Structural schematic diagram of the cleaning plow blade in the shown Embodiment 2;

[0052] Figure 9 is Figure 6 Schematic diagram of the setting of the plasma flame injector and the fuel nozzle in the shown Embodiment 2;

[0053] Figure 10 Structural schematic diagram of Embodiment 3 of the present invention;

[0054] Figure 11 is Figure 10 Schematic diagram of the setting of the plasma flame injector and the fuel nozzle in the shown Embodiment 3.

[0055] In the figure, 1 - cylinder body, 2 - sludge air-lock feeding mechanism, 3 - rotary chain roller suspension drying mechanism, 31 - power device, 32 - main shaft, 33 - material throwing disc, 34 - throwing chain, 35 - cleaning plow blade, 36 - guide lining plate, 4 - suspension incineration mechanism, 41 - heat insulation layer, 42 - heat-resistant and wear-resistant layer, 43 - plasma flame injector, 44 - hot slag air-blowing cooling device, 441 - air cap, 45 - blower, 46 - slag outlet, 47 - gas nozzle, 48 - slag discharging device, 5 - waste gas purification device, 51 - multi-tube cyclone condensate device, 511 - cyclone tube, 52 - fiber wire mesh condensate device, 53 - plasma flame catalytic purification device, 54 - waste gas condensation tower, 6 - additive feeding device, 61 - odor purification agent feeding device, 62 - micelle-breaking drying additive feeding device, 63 - desulfurization and sulfur-fixing agent feeding device. Specific embodiments

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Embodiment 1:

[0058] Refer to Figures 1-5This embodiment mainly includes a cylinder 1, a sludge air-locking feeding mechanism 2, a rotary chain rolling and suspension drying mechanism 3, a suspension incineration mechanism 4 and a waste gas purification device 5. The sludge air-locking feeding mechanism 2 is arranged at the top of the cylinder 1 and is connected with the inside of the cylinder 1. The rotary chain rolling and suspension drying mechanism 3 is arranged at the upper part of the cylinder 1. The suspension incineration mechanism 4 is arranged at the lower part of the cylinder 1. The bottom of the rotary chain rolling and suspension drying mechanism 3 is connected with the upper part of the suspension incineration mechanism 4. The air inlet of the waste gas purification device 5 is connected with the waste gas outlet at the top of the cylinder 1 by a pipeline.

[0059] The barrel 1 in this embodiment is cylindrical.

[0060] The sludge air-locking feeding mechanism 2 in this embodiment is an air-locking flap valve.

[0061] The rotary chain rolling and suspension drying mechanism 3 mainly includes a power device 31, a main shaft 32, a multi-layered material throwing tray 33, a throwing chain 34, a cleaning plow 35, and a guide lining 36. The power device 31 is fixed on the top of the cylinder 1 to provide power for the rotation of the rotary chain rolling and suspension drying mechanism 3. The power device 31 is a motor and a reducer. The main shaft 32 is fixed at the center of the cylinder 1 and is connected to the power device 31. The multi-layered material throwing tray 33 is fixed on the main shaft at intervals. Six throwing chains 34 are arranged in an annular shape on the periphery of each material throwing tray 33. The throwing chain 34 is a single-layer arrangement, which is used to break up the falling sludge, increase the contact area between the sludge and the hot gas, and slow down the sludge. The falling speed of the mud is reduced, and the heat exchange efficiency is improved. The projection of the cleaning plow 35 is triangular, fixed on the main shaft 32, and located above the throwing tray 33, and is used to clean the sludge attached to the guide lining 36. The guide lining 36 is fixed on the inner side of the cylinder 1, and the movement trajectory of the sludge and airflow in the cylinder is forced to change, so that the downward crushed sludge and the upward hot air flow are reversed in a zigzag shape between the guide lining and the multi-layer throwing tray, increasing the residence time of the sludge and accelerating the mixing speed with the hot air flow; the main shaft 32 drives the multi-layer throwing tray 33 and the throwing chain 34 annularly fixed to the outer end of the throwing tray 33 to rotate, and together with the guide lining 36, a sludge breaking rotating chain rolling, pumping, suspending and drying space is constructed.

[0062] The described suspension incineration mechanism 4 mainly includes a heat insulation layer 41, a heat-resistant and wear-resistant layer 42, a plasma flame injector 43, a hot slag air-blowing cooling device 44, a blower 45, and a slag outlet 46. The heat insulation layer 41 and the heat-resistant and wear-resistant layer 42 are sequentially fixed to the inner side of the lower part of the cylinder body 1. The hot slag air-blowing cooling device 44 is arranged on the outer side of the lower part of the cylinder body 1. The hot slag air-blowing cooling device 44 is connected to the inside of the cylinder body 1 through a plurality of air caps 441 arranged in the same plane. The air inlet of the hot slag air-blowing cooling device 44 is connected to the air outlet of the blower 45 through a pipeline. The slag outlet 46 is arranged on the side wall of the lower part of the cylinder body 1. There are 8 plasma flame injectors 43, which are arranged in upper and lower layers on the middle and lower part walls of the cylinder body 1 and are connected to the inside of the cylinder body 1. The heat insulation layer 41, the heat-resistant and wear-resistant layer 42, the plasma flame injector 43, and the hot slag air-blowing cooling device 44 together form a suspension incineration space for dried sludge. The high-temperature plasma flame is used for heating and ensuring the temperature field for the full and clean combustion of dried sludge.

[0063] The plasma flame injectors 43 in the same layer are distributed in a circular tangential manner, so that the plasma flame is distributed in a swirling flow in the suspension incineration space, which is beneficial to the full mixing with the dried sludge, reduces the falling speed of the dried sludge, increases the combustion time, and improves the combustion efficiency and burnout rate.

[0064] The waste gas purification device 5 is a multi-tube cyclone condensate device 51, which is mainly composed of a plurality of cyclone tubes 511. The cyclone tubes 511 utilize the rotational centrifugal aggregation effect of the guide vanes in the tubes on the high-concentration water-vapor-containing gas in the pipeline to separate the moisture in the air flow from the air.

[0065] This embodiment also is provided with an additive feeding device 6. The additive feeding device 6 is an odor purification agent feeding device 61. The odor purification agent feeding device 61 is arranged on the side wall of the upper part of the cylinder body 1 and sprays a purification agent for eliminating the odor of the sludge into the cylinder body 1.

[0066] This embodiment also is provided with an air extraction device (not shown in the figure). The air extraction device is an air extraction fan, and its air inlet is connected to the air outlet of the waste gas purification device 5 for sucking gas, so that both the dispersed rotary chain roller suspension drying space and the suspension incineration space are in a slightly negative pressure state.

[0067] This embodiment also is provided with a monitoring system (not shown in the figure). The monitoring system includes a thermocouple thermometer, a pressure gauge, an on-line flue gas analyzer, a monitoring console, etc., and is used for monitoring and controlling the working conditions and flue gas components of the drying and incineration processes.

[0068] This embodiment also provides an incineration method for a municipal sludge suspension drying and clean incineration equipment, including the following steps:

[0069] (1) Continuously convey municipal dewatered sludge with a moisture content of about 80% to the sludge air-lock feeding mechanism 2 through a screw conveyor, and feed it into the dispersed rotary chain roller suspension drying space from the top of the cylinder body 1.

[0070] (2) The wet sludge in large lumps is repeatedly rolled, pumped, and dispersed by the rotary chain roller suspension drying mechanism 3, and descends in a zigzag shape between the diversion lining plate and the multi-layer throwing plates. During the descent, it is dynamically suspended and stirred and mixed with the non-reducing hot gas at 750 °C to 850 °C generated by the upward plasma flame incinerating and drying the sludge, so that the relatively cold water, solid particles, etc. in the wet sludge are in direct contact with the hot gas, quickly dehydrated. At the same time, during the descent, the throwing chain 34 whips the crusty sludge that is extremely difficult to dry, which has a surface crust hardened due to dehydration shrinkage while the inside is still sludge with a relatively high water content, causing it to burst and disperse, exposing the high-water-content sludge inside and making it in direct contact with the hot gas for rapid dehydration until the sludge is dried into loose fine particles and scattered into the suspension incineration space.

[0071] (3) Under the combustion-supporting effect of the preheated air generated by the cooling residue blown by the hot slag air-blowing cooling device 44, the dried sludge is ignited by the high-temperature plasma flame and burned completely in a fluidized state in an oxidizing atmosphere at 900 °C to 1100 °C, providing most of the heat energy required for drying the wet sludge. And in the high-temperature plasma flame oxidation combustion, dioxins and hydrocarbon volatile compounds can be completely eliminated. The inorganic minerals in the sludge are thermally decomposed and then chemically combined at high temperature to form silicate minerals with certain potential hydraulic activity. At the same time, in the high-temperature thermal chemical reaction, heavy metal ions are melted and solidified by silicate groups and / or aluminate groups and / or silicoaluminate groups at high temperature. These silicate minerals are cooled to form active solid slag, which can be directly used as active admixtures in cement grinding plants to produce cement. The high-temperature incineration exhaust gas generated rises into the rotary chain roller suspension drying space to dry the wet sludge and then is discharged into the exhaust gas purification device as low-temperature high-moisture exhaust gas.

[0072] (4) The exhaust gas is discharged up to standard after catalytic purification, and the condensed water generated (the impurities contained are non-toxic inorganic substances) can be directly discharged into the sewage treatment plant.

[0073] The thermal energy of the hot gas for rotating chain roller suspension drying of the wet sludge mainly comes from the combustion heat energy of the organic combustibles in the dried sludge and the heat energy generated by the plasma flame injector.

[0074] Example 2:

[0075] Refer to Figures 6-9 This example is different from Example 1 in that: the throwing chain 34 is arranged in two upper and lower layers. The cleaning plow blade 35 is in the shape of a plowshare. The cylinder body at the suspension incineration space is quadrilateral and slightly narrower than the upper and lower cylinder bodies.

[0076] In this embodiment, multiple wind caps 431 are arranged in a stepped manner.

[0077] The suspension incineration mechanism 4 in this embodiment is also provided with a gas nozzle 47. The gas nozzle 47 is arranged on the middle-lower side wall of the cylinder body 1 and is communicated with the inside of the cylinder body 1, and is used for injecting gas into the suspension incineration space to assist combustion so as to reduce power consumption.

[0078] The waste gas purification device 5 includes a multi-tube cyclone condensate device 51 and a fiber mesh condensate device 52. The multi-tube cyclone condensate device 51 is arranged at the upper part of the cylinder body 1, and its air outlet is communicated with the air inlet of the fiber mesh condensate device 52 through a pipeline.

[0079] This embodiment is also provided with a micelle-breaking drying aid feeding device 62, and the micelle-breaking drying aid feeding device 62 is arranged on the upper side wall of the cylinder body 1.

[0080] The moisture content of the municipal dewatered sludge processed in this embodiment is about 85%. The temperature of the non-reducing hot gas for drying the sludge is 800 °C to 900 °C, and the combustion temperature of the sludge incinerated in the suspension incineration space is 950 °C to 1200 °C. The cooled activated solid slag is directly used as an active admixture for the cement plant to produce cement clinker.

[0081] To destroy the bacterium mass colloid water retention and flocculation mechanism of the sludge, improve the dehydration and drying efficiency, and / or improve the combustion performance of the organic matter sludged and the organic matter of the high internal water bacterium mass in the sludge, reduce the sludge drying energy consumption and incineration energy consumption, and improve the sludge treatment efficiency, a micelle-breaking drying agent mainly composed of a strong oxidant such as ferrate and an ion interference agent is sprayed into the wet sludge, and the dosage is 0.3% of the mass ratio of the wet sludge.

[0082] The rest is the same as that of Embodiment 1.

[0083] Embodiment 3:

[0084] Refer to Figures 10-11 , the difference between this embodiment and Embodiment 1 is that: the sludge air-lock feeding mechanism 2 is arranged on the upper side surface of the cylinder body 1, and the air-lock and feeding are realized by using a feeding screw. The waste gas outlet of the cylinder body 1 is arranged on the upper side wall.

[0085] The chain shaker 34 in this embodiment is arranged in three layers, namely the upper, middle and lower layers.

[0086] In this embodiment, the cylinder body at the suspension incineration space is slightly narrower than the upper cylinder body.

[0087] The plasma flame injector 43 has only one layer, and the number is 3. There are 3 gas nozzles 47, which are evenly spaced from the plasma flame injector 43.

[0088] A plurality of air outlet pipes of the hot slag blast cooling device 44 are arranged on the outer side of the lower conical part of the cylinder body 1 and are communicated with the inside of the cylinder body 1.

[0089] In this embodiment, a slag discharging device 48 is further provided. The slag discharging device 48 is a screw conveyor and is arranged at the bottom of the cylinder body.

[0090] The waste gas purification device 5 includes a plasma flame catalytic purification device 53 and a waste gas condensation tower 54. The air inlet of the plasma flame catalytic purification device 53 is communicated with the waste gas outlet at the top of the cylinder body 1 through a pipeline, and the air inlet of the waste gas condensation tower 54 is communicated with the air outlet of the plasma flame catalytic purification device 53 through a pipeline. In the plasma flame catalytic purification device 53, under the synergistic action of the plasma flame, the activated catalytic wire mesh, and a large number of hot and highly active hydroxyl free radicals and hydrogen free radicals generated by the action of the plasma flame on water vapor, the molecular odor organic pollutants volatilized with water vapor during sludge dewatering are synchronously and thoroughly oxidized and purified.

[0091] This embodiment also provides a micelle-breaking drying aid feeding device 62 and a desulfurization and sulfur-fixing agent feeding device 63. The desulfurization and sulfur-fixing agent feeding device 63 is arranged at the top of the cylinder body 1.

[0092] The moisture content of the municipal dewatered sludge processed in this embodiment is about 90%. The temperature of the non-reducing hot gas for drying the sludge is 900 °C to 1100 °C, and the combustion temperature of the sludge burned in the suspension incineration space is 1100 °C to 1380 °C. The cooled active solid slag is directly used as a raw material for making ecological bricks, and the generated condensed water is discharged after filtering out inorganic ash residues.

[0093] To destroy the bacterium mass colloid water-retaining flocculation mechanism of the sludge, improve the dewatering and drying efficiency, and / or improve the combustion performance of the organic matter sludged and the organic matter of the high internal water bacterium mass in the sludge, reduce the energy consumption of sludge drying and incineration, and improve the sludge treatment efficiency, a micelle-breaking drying agent mainly composed of a strong oxidant such as ferrate and an ion interference agent is sprayed into the wet sludge, and the dosage is 0.5% of the mass ratio of the wet sludge.

[0094] To improve the sulfur-fixing effect, a desulfurization and sulfur-fixing agent is sprayed into the wet sludge, and the dosage of the desulfurization and sulfur-fixing agent is 0.3% of the mass of the wet high-sulfur sludge.

[0095] The rest is the same as in Embodiment 1.

[0096] Those skilled in the art can make various modifications and variations to the present invention. If these modifications and variations are within the scope of the claims of the present invention and its equivalent technologies, then these modifications and variations are also within the protection scope of the present invention.

[0097] The content not described in detail in the specification is the prior art well known to those skilled in the art.

Claims

1. A municipal sludge suspension drying and clean incineration equipment, including a cylinder body, characterized in that: It also includes a sludge air-lock feeding mechanism, a rotary chain-roll extraction suspension drying mechanism, a suspension incineration mechanism and an exhaust gas purification device. The sludge air-lock feeding mechanism is arranged on the top or upper side wall of the cylinder body, and the sludge air-lock feeding mechanism is communicated with the inside of the cylinder body. The rotary chain-roll extraction suspension drying mechanism and the suspension incineration mechanism are arranged inside the cylinder body. The bottom of the rotary chain-roll extraction suspension drying mechanism is communicated with the upper part of the suspension incineration mechanism. The air inlet of the exhaust gas purification device is communicated with the inside of the cylinder body; The rotary chain-roll extraction suspension drying mechanism is arranged in the upper part of the cylinder body. The rotary chain-roll extraction suspension drying mechanism includes a main shaft, a throwing disc, throwing chains and a diversion lining plate. The main shaft is fixed at the central position of the cylinder body. The throwing discs are provided with multiple layers and are fixedly arranged on the main shaft at intervals. The throwing chains are arranged in a ring on the outer periphery of each throwing disc. The diversion lining plate is fixed on the inner side of the cylinder body. The main shaft drives the throwing discs and the throwing chains to rotate and forms a rotary chain-roll extraction suspension drying space for the sludge with the diversion lining plate; The sludge air-lock feeding mechanism is an air-lock flap valve; The rotary chain-roll extraction suspension drying mechanism is also provided with cleaning plows. The projection of the cleaning plows is triangular, fixed on the main shaft and located above the throwing discs, and is used for cleaning the sludge attached to the diversion lining plate; The suspension incineration mechanism is arranged in the lower part of the cylinder body. The suspension incineration mechanism includes a plasma flame injector, a hot slag air-blowing cooling device and a blower. The hot slag air-blowing cooling device is arranged on the outer side of the lower part of the cylinder body. The hot slag air-blowing cooling device is communicated with the cylinder body. The air inlet of the hot slag air-blowing cooling device is connected with the air outlet of the blower. The plasma flame injector is arranged in the lower part of the cylinder body. An insulating layer and a heat-resistant and wear-resistant layer are arranged on the inner side of the lower part of the cylinder body. A slag outlet is arranged on the side wall of the lower part of the cylinder body. The heat-resistant and wear-resistant layer, the plasma flame injector and the hot slag air-blowing cooling device form a suspension incineration space for the dried sludge; The throwing chains are distributed in one or more layers on the throwing discs. The plasma flame injectors are arranged in one or more layers. The plasma flame injectors are arranged in a ring tangential distribution on the same layer; An auxiliary fuel feeding device is arranged on the side wall of the lower part of the cylinder body.

2. The municipal sludge suspension drying and clean incineration equipment according to claim 1, wherein: The exhaust gas purification device is an exhaust gas condensate device or a combination of an exhaust gas catalytic purification device and an exhaust gas condensate device. The exhaust gas catalytic purification device is composed of at least one of a plasma flame catalytic purification device, a regenerative thermal oxidizer and a catalytic oxidation purification furnace. The exhaust gas condensate device is composed of at least one of a cyclone condensate device, a wire mesh condensate device, a phase change condensation device and a condensation water separation device.

3. The municipal sludge suspension drying and clean incineration equipment according to claim 1, characterized in that: An air extraction device, a monitoring system, an explosion-proof and fire extinguishing control system are also provided. The air inlet of the air extraction device is connected with the air outlet of the exhaust gas purification device. A slag discharging device is arranged at the bottom or bottom side of the cylinder body. An auxiliary agent feeding device is arranged on the top or upper side wall of the cylinder body. An observation hole and a manhole are also arranged on the side wall of the cylinder body. The monitoring system includes a temperature measuring instrument, a pressure measuring instrument, an online flue gas analyzer and a monitoring console.

4. A method for incinerating the municipal sludge suspension drying and cleaning incineration equipment according to any one of claims 1-3, characterized in that: It includes the following steps: (1) Municipal sludge with a moisture content ≤ 90% is fed into the cylinder body through the sludge air-lock feeding mechanism or directly fed into the cylinder body from the top / upper part of the cylinder body; (2) The sludge that enters the rotary chain-rolling and suspension drying space in large lumps is broken up under the rolling and pumping of the chain. It descends in a zigzag pattern between the diversion lining plate and the multi-layer throwing plates. During the descent, it is dynamically suspended, stirred, and mixed with the non-reducing hot gas at 750 °C to 1100 °C generated by the upward plasma flame injector for incinerating and drying the sludge, achieving rapid dehydration. At the same time, during the descent, the chain whips the crusty sludge that is extremely difficult to dry, which has a surface crust hardened due to dehydration shrinkage but still has a relatively high water content inside. This causes the crusty sludge to crack and disperse, exposing the high-water-content sludge inside and bringing it into direct contact with the hot gas for rapid dehydration until the sludge is dried into loose fine granular form and scattered into the suspension incineration space. (3) Under the combustion-supporting effect of the preheated air generated by the cooling residue blown by the hot slag air-cooling device, the fine granular dried sludge is ignited by the high-temperature plasma flame and undergoes complete combustion of organic matter in a fluidized state in an oxidizing atmosphere at 900 °C to 1380 °C, providing most of the heat energy required for drying the wet sludge. After the inorganic minerals in the sludge thermally decompose to form aluminosilicate minerals, the high-temperature incineration exhaust gas ascends into the rotary chain-rolling and suspension drying space to dry the wet sludge and then is converted into low-temperature and high-moisture exhaust gas and discharged into the exhaust gas purification device. (4) The exhaust gas is discharged up to standard after catalytic purification. The generated condensate can be directly discharged into the sewage treatment plant or discharged after filtering out the inorganic ash.

5. The incineration method of the municipal sludge suspension drying and clean incineration equipment according to claim 4, characterized in that: Add a micelle-breaking drying agent mainly composed of a strong oxidant ferrate and an ion interference agent to the municipal sludge, with a dosage of 0.25% to 0.75% of the mass of the municipal sludge. Add a desulfurization and sulfur-fixing agent and / or a heavy metal solidification promoter during the municipal sludge or during its drying process or during its incineration process. The dosage of the desulfurization and sulfur-fixing agent is 0.2% to 0.5% of the mass of the municipal sludge, and the dosage of the heavy metal solidification promoter is 0.1% to 0.4% of the mass of the municipal sludge.

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