Electrolytic cold-drying incineration system for sludge

Abstract

The utility model discloses an electrolytic cold-drying incineration system for sludge. The electrolytic cold-drying incineration system comprises a sludge mechanical dehydration system, a sludge drying system, a sludge incineration system and a flue gas treatment system, an outlet of the sludge mechanical dewatering system is connected with an inlet of the sludge drying system so as to convey half-dry sludge to the sludge drying system, an outlet of the sludge drying system is connected with an inlet of the sludge incineration system so as to convey dry sludge to the sludge incineration system, and dregs are discharged from a dreg outlet of the sludge incineration system. And a flue gas inlet of the flue gas treatment system is connected with a flue gas outlet of the sludge incineration system. The electrolytic freeze-drying technology is utilized, and the technical problems that an existing sludge drying system cannot meet the requirement for lower sludge moisture content, the sludge moisture content is high, and due to the fact that the moisture content is unstable, the incineration treatment effect is not ideal, energy consumption is high, and the treatment efficiency is low are solved. The system provided by the utility model recycles steam generated by sludge incineration waste heat to provide a heat source for the drying system, and realizes cyclic utilization of energy.

Description

Technical Field

[0001] The utility model relates to sludge treatment, in particular to an electrolytic cold-drying incineration system for sludge. Background Art

[0002] Sludge is a significant solid waste generated during the treatment of municipal sewage and industrial wastewater. Traditional sludge treatment methods typically involve dehydration, drying, and incineration. However, these methods suffer from high energy consumption, low treatment efficiency, and environmental pollution. Therefore, there is an urgent need to develop more efficient and environmentally friendly sludge treatment technologies. Utility Model Content

[0003] In order to solve the defects of the above-mentioned prior art, the utility model provides an electrolytic cold-drying incineration system for sludge. The utility model can shorten the sludge processing time, reduce energy consumption, easily separate the sludge and water, efficiently remove moisture from the sludge, achieve lower sludge moisture content requirements, and inhibit the generation of odor.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: a sludge electrolytic cold-drying incineration system, comprising a sludge mechanical dehydration system, a sludge drying system, a sludge incineration system, and a flue gas treatment system; the outlet of the sludge mechanical dehydration system is connected to the inlet of the sludge drying system to transport semi-dry sludge to the sludge drying system, the outlet of the sludge drying system is connected to the inlet of the sludge incineration system to transport dry sludge to the sludge incineration system, the slag outlet of the sludge incineration system discharges slag, and the flue gas inlet of the flue gas treatment system is connected to the flue gas outlet of the sludge incineration system.

[0005] The sludge mechanical dewatering system includes a wet sludge pit, a plunger pump, a filter press, and a semi-dry sludge conveyor connected in sequence. The wet sludge pit receives wet sludge, and the outlet of the semi-dry sludge conveyor is connected to the sludge drying system.

[0006] The sludge drying system includes a semi-dry sludge silo, a feeding screw machine, a sludge extruder, an electrolytic cold dryer, a water vapor condenser and a first induced draft fan connected in sequence; the electrolytic cold dryer is provided with a freezing subsystem, a sublimation drying subsystem and a vacuum subsystem; a dry sludge conveyor is provided behind the sludge discharge port of the electrolytic cold dryer; and a water circulation tower is provided in parallel with the water vapor condenser.

[0007] The sludge incineration system includes a dry sludge silo, a furnace feeding system, a fluidized bed incinerator, a sedimentation chamber and a waste heat boiler connected in sequence; the dry sludge silo is connected to the dry sludge conveyor; a calcium carbonate quantitative feeder is provided in parallel above the furnace feeding system, and an evaporator is installed at the top and outlet of the sedimentation chamber; an air preheater and an economizer are provided below the waste heat boiler; a spray cooling device is provided above the fluidized bed incinerator, and a connected slag cooling system is provided at the bottom of the fluidized bed incinerator, the sedimentation chamber and the waste heat boiler; the outlet of the first induced draft fan is connected to the inlet of the fluidized bed incinerator through a pipeline.

[0008] The flue gas treatment system includes an electrostatic precipitator, a dry reactor, a bag dust collector, a second induced draft fan and a desulfurization tower connected in sequence. The flue in front of the dry reactor is connected to a slaked lime quantitative feeder and an activated carbon quantitative feeder. A chimney is provided above the desulfurization tower.

[0009] The sludge incineration system also includes a primary fan and a secondary fan connected in parallel. The primary fan is connected to the wet sludge pit to transport the odor from the sludge bin to the air preheater for heating, and finally to the fluidized bed incinerator; the secondary fan is connected to the wet sludge pit to transport the odor from the sludge bin directly to the fluidized bed incinerator.

[0010] A steam cylinder is further provided in parallel between the waste heat boiler and the electrolytic cold dryer, the inlet of the steam cylinder is connected to the top of the waste heat boiler, and the outlet of the steam cylinder is connected to the steam inlet of the sublimation drying subsystem of the electrolytic cold dryer.

[0011] The dry sludge silo is provided with a feeder to evenly deliver the dry sludge to the furnace feeding system.

[0012] The outlet of the waste heat boiler is connected to the inlet of the electrostatic precipitator through a pipeline.

[0013] In summary, the present invention has achieved the following technical effects:

[0014] The utility model provides an electrolytic cold-drying and incineration treatment system for sludge. The electrolytic cold-drying machine dries and treats the sludge under low temperature and vacuum environment, which greatly reduces the flammability of the sludge after drying, improves safety, and effectively reduces the degree of sludge odor emission during the drying process.

[0015] The utility model provides an electrolytic cold-drying incineration treatment system for sludge. Drying and sublimation can efficiently remove moisture from the sludge, achieve lower sludge moisture content requirements, make subsequent incineration more stable, and reduce the use of auxiliary fuel.

[0016] The utility model provides an electrolytic cold-drying incineration treatment system for sludge. The outlet of the fluidized bed incinerator is equipped with a settling chamber to avoid the influence of a large amount of sludge ash on the heat exchange of the tail heating surface, thereby generating steam to the greatest extent; the steam is recycled and used in the sludge drying system, realizing the utilization of waste heat and having good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a connection diagram of a sludge electrolytic cold-drying incineration system provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below with reference to the accompanying drawings.

[0019] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0022] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0023] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] Example:

[0025] Freeze-drying technology is an efficient and mature drying technology, which is widely used in the fields of food, medicine, etc. The utility model applies freeze-drying technology to the field of environmental protection to achieve sludge treatment.

[0026] like Figure 1 As shown, a sludge electrolytic cold-drying incineration system includes a sludge mechanical dehydration system, a sludge drying system, a sludge incineration system, and a flue gas treatment system; the outlet of the sludge mechanical dehydration system is connected to the inlet of the sludge drying system to transport semi-dry sludge to the sludge drying system, the outlet of the sludge drying system is connected to the inlet of the sludge incineration system to transport dry sludge to the sludge incineration system, the slag outlet of the sludge incineration system discharges slag, and the flue gas inlet of the flue gas treatment system is connected to the flue gas outlet of the sludge incineration system.

[0027] The sludge mechanical dewatering system includes a wet sludge pit 1, a plunger pump 2, a filter press 3, and a semi-dry sludge conveyor 4 connected in sequence. The wet sludge pit 1 receives wet sludge, and the outlet of the semi-dry sludge conveyor 4 is connected to the sludge drying system.

[0028] The sludge drying system includes a semi-dry sludge silo 5, a feeding screw machine 6, a sludge extruder 7, an electrolytic cold dryer 8, a water vapor condenser 9 and a first induced draft fan 10 connected in sequence; the electrolytic cold dryer 8 is provided with a freezing subsystem 11, a sublimation drying subsystem 12 and a vacuum subsystem 13; a dry sludge conveyor 14 is provided behind the sludge discharge port of the electrolytic cold dryer 8; and a water circulation tower 15 is provided in parallel with the water vapor condenser 9.

[0029] The sludge incineration system includes a dry sludge silo 16, a furnace feeding system 17, a fluidized bed incinerator 19, a sedimentation chamber 20 and a waste heat boiler 21 connected in sequence; the dry sludge silo 16 is connected to the dry sludge conveyor 14; a calcium carbonate quantitative feeder 18 is provided in parallel above the furnace feeding system 17, and an evaporator is installed at the top and outlet of the sedimentation chamber 20; an air preheater 22 and an economizer are provided below the waste heat boiler 21; a spray cooling device is provided above the fluidized bed incinerator 19, and a slag cooling system 35 is connected to the lower parts of the fluidized bed incinerator 19, the sedimentation chamber 20 and the waste heat boiler 21; the outlet of the first induced draft fan 10 is connected to the inlet of the fluidized bed incinerator 19 through a pipeline.

[0030] An SNCR is further provided on the upper portion of the fluidized bed incinerator 19 , and limestone is placed inside the fluidized bed incinerator 19 for in-furnace desulfurization. A layer of SCR is further provided at the tail end of the waste heat boiler 21 .

[0031] The flue gas treatment system includes an electrostatic precipitator 25, a dry reactor 26, a bag filter, a second induced draft fan, and a desulfurization tower 30, which are connected in sequence. A slaked lime dosing machine 28 and an activated carbon dosing machine 29 are connected to the flue before the dry reactor 26. A chimney 32 is located above the desulfurization tower 30. A soft water tank 33 is installed in the chimney 32.

[0032] The sludge incineration system also includes a primary fan 23 and a secondary fan 24 connected in parallel. The primary fan 23 is connected to the wet sludge pit 1, and transports the odor from the sludge bin to the air preheater 22 for heating, and finally to the fluidized bed incinerator 19; the secondary fan 24 is connected to the wet sludge pit 1, and transports the odor from the sludge bin directly to the fluidized bed incinerator 19.

[0033] A steam sub-cylinder 34 is also provided in parallel between the waste heat boiler 21 and the electrolytic cold dryer 8 . The inlet of the steam sub-cylinder 34 is connected to the top of the waste heat boiler 21 , and the outlet of the steam sub-cylinder 34 is connected to the steam inlet of the sublimation drying subsystem 12 of the electrolytic cold dryer 8 .

[0034] The dry sludge silo 16 is provided with a feeder to evenly deliver the dry sludge to the furnace feeding system 17.

[0035] The outlet of the waste heat boiler 21 is connected to the inlet of the electrostatic precipitator 25 through a pipeline.

[0036] The above equipment can all adopt common models on the market.

[0037] Working principle:

[0038] The wet sludge is transported and poured into the wet sludge pit 1, and then pumped to the hopper above the filter press 3 by the plunger pump 2. The sludge dehydrated by the filter press is sent to the semi-dry sludge silo 5 for temporary storage through the semi-dry sludge conveyor 4.

[0039] The screw feeder uniformly sends the semi-dry sludge from the semi-dry sludge bin 5 to the sludge extruder 7, and the sludge is cut into strips after being extruded and then falls into the electrolytic drier 8 for drying treatment. The sludge is first frozen at low temperature and then heated to sublimate to remove the condensed water in the electrolytic drier 8. The high-temperature steam required for heating comes from the waste heat boiler 21, and the steam enters the sublimation drying subsystem 12 of the electrolytic drier 8 through the steam coil to reduce the moisture content of the outlet sludge to a specified range. After drying, the sludge is sent to the dry sludge bin 16 through the dry sludge conveyor 14 containing water cooling.

[0040] After the dry water vapor entrains fine sludge particles and the flue gas comes out of the electrolytic drier 8, it passes through the water vapor condenser 9, and more than 80% of the entrained water vapor is condensed and removed. The condensed water directly enters the water treatment link. The flue gas after removing the water vapor is sent to the fluidized bed incinerator 19 through the first induced draft fan 10 for blending burning.

[0041] After drying, the sludge is sent to the dry sludge bin 16 through the dry sludge conveyor 14. A raking device is arranged in the bin to uniformly send the sludge to the furnace front feeding system 17 at the bottom of the bin, so that the sludge can stably enter the fluidized bed incinerator 19. The hearth of the fluidized bed incinerator 19 is an adiabatic hearth, and the temperature is maintained at 850-950℃. A particle settling chamber 20 is arranged at the outlet, and an evaporator is installed at the upper part of the settling chamber 20. An evaporator is also installed at the outlet of the settling chamber 20, so as to generate more low-pressure steam for heating the electrolytic drier 8. After passing through the evaporator, the flue gas temperature of the fluidized bed incinerator 19 decreases from 930℃ to 500℃. The air sent out by the primary air fan 23 is preheated by the air preheater 22, and the temperature increases from 20℃ to about 200℃ and is sent into the fluidized bed incinerator 19 for combustion. In order to fully utilize the waste heat, an economizer is installed in the waste heat boiler 21 to heat the boiler evaporation water. The flue gas in the waste heat boiler 21 decreases from 500℃ to 200℃ after passing through the air preheater 22 and the economizer, and then enters the electrostatic precipitator 25. A spray cooling device is arranged above the fluidized bed incinerator 19 to avoid excessive outlet temperature. The fluidized bed incinerator 19, the settling chamber 20 and the waste heat boiler 21 are connected to a slag cooling system 35 at the lower part, and a roller slag cooler cools the high-temperature slag to about 100℃.

[0042] The fluidized bed incinerator 19 is added with SNCR in the upper part, and the tail flue of the waste heat boiler 21 is reserved with an SCR, so that the nitrogen oxide is less than 50mg / Nm3 after excess ammonia is sprayed through the SNCR. Limestone is added in the fluidized bed incinerator 19 for in-furnace desulfurization, and the desulfurization efficiency can reach more than 60%. After the flue gas generated by the fluidized bed incineration passes through the electrostatic precipitator 25, 99.9% of the sludge particles are removed, and the flue gas after dust removal enters the dry reaction machine 26. The dry reaction machine 26 sprays calcium hydroxide for desulfurization and sprays activated carbon powder for adsorbing heavy metals and dioxins in the inlet flue, and the flue gas enters the dry reaction machine 26 and is fully reacted. Then the outlet flue gas enters the bag filter, and after filtration, the particulate matter concentration is less than 10mg / Nm3. A second induced draft fan is arranged after the bag filter, and a desulfurization tower 30 is arranged behind the second induced draft fan, so that the SO2 emission is less than 35mg / Nm3, and the HCl emission is also better than the national emission standard. Finally, the treated flue gas enters the atmosphere through the chimney 32 arranged on the desulfurization tower 30.

[0043] Compared with the traditional sludge heat drying method, the sludge and water can be separated more easily, the water in the sludge can be removed efficiently, and the water content of the sludge can be reduced to a lower requirement. Moreover, the sludge electrolysis cold drying technology freezes the sludge at low temperature, and then performs a heating and sublimation step in a vacuum sealed space, so that the generation of odor can be inhibited. In addition, the water separated from the sludge through sublimation is recovered to recover high-purity water, and the range of water recycling is expanded.

[0044] The application integrates advanced freeze drying technology, emerging fluidized bed incineration technology and mature and stable flue gas treatment system, can improve the sludge treatment efficiency, produce dry sludge with lower water content, reduce the overall energy consumption, and realize the recycling of water resources and heat energy.

[0045] The above only describes the preferred embodiments of the application, and does not limit the application in any form. Any simple modification, equivalent change and modification made according to the technical essence of the application to the above embodiments are within the scope of the technical scheme of the application.

Claims

1. A sludge electrolytic cold-drying incineration system, characterized by: Including sludge mechanical dewatering system, sludge drying system, sludge incineration system, flue gas treatment system; The outlet of the sludge mechanical dewatering system is connected to the inlet of the sludge drying system to transport the semi-dry sludge to the sludge drying system, the outlet of the sludge drying system is connected to the inlet of the sludge incineration system to transport the dry sludge to the sludge incineration system, the sludge outlet of the sludge incineration system discharges the sludge, and the flue gas inlet of the flue gas treatment system is connected to the flue gas outlet of the sludge incineration system; the sludge mechanical dewatering system comprises a wet sludge material pit (1), a plunger pump (2), a filter press (3), and a semi-dry sludge conveyor (4) connected in sequence, the wet sludge material pit (1) receives the wet sludge. The outlet of the semi-dry sludge conveyor (4) is connected to the sludge drying system; the sludge drying system comprises a semi-dry sludge silo (5), a feeding screw machine (6), a sludge extruder (7), an electrolytic cold dryer (8), a water vapor condenser (9) and a first induced draft fan (10) connected in sequence; the electrolytic cold dryer (8) is provided with a freezing subsystem (11), a sublimation drying subsystem (12) and a vacuum subsystem (13); a dry sludge conveyor (14) is provided behind the sludge outlet of the electrolytic cold dryer (8); and a water circulation tower (15) is provided in parallel with the water vapor condenser (9).

2. The electrolytic cold-drying incineration system for sludge according to claim 1, characterized in that: The sludge incineration system comprises a dry sludge silo (16), a furnace front feeding system (17), a fluidized bed incinerator (19), a settling chamber (20) and a waste heat boiler (21) connected in sequence; the dry sludge silo (16) is connected to the dry sludge conveyor (14); a calcium carbonate quantitative feeder (18) is provided in parallel above the furnace front feeding system (17), and an evaporator is installed at the upper part and outlet of the settling chamber (20); an air preheater (22) and a coal economizer are provided below the waste heat boiler (21); a spray cooling device is provided above the fluidized bed incinerator (19), and a slag cooling system (35) is provided below the fluidized bed incinerator (19), the settling chamber (20) and the waste heat boiler (21); the outlet of the first induced draft fan (10) is connected to the inlet of the fluidized bed incinerator (19) through a pipeline.

3. The electrolytic cold-drying incineration system for sludge according to claim 2, characterized in that: The flue gas treatment system comprises an electrostatic precipitator (25), a dry reactor (26), a second induced draft fan and a desulfurization tower (30) connected in sequence, a slaked lime quantitative feeder (28) and an activated carbon quantitative feeder (29) being connected to a flue in front of the dry reactor (26), and a chimney (32) being provided above the desulfurization tower (30).

4. The electrolytic cold-drying incineration system for sludge according to claim 2, characterized in that: The sludge incineration system further comprises a primary fan (23) and a secondary fan (24) connected in parallel, wherein the primary fan (23) is connected to the wet sludge material pit (1) and transports the odor from the sludge bin to the air preheater (22) for heating, and finally transports the odor from the sludge bin to the fluidized bed incinerator (19); the secondary fan (24) is connected to the wet sludge material pit (1) and transports the odor from the sludge bin directly to the fluidized bed incinerator (19).

5. The electrolytic cold-drying incineration system for sludge according to claim 2, characterized in that: A steam cylinder (34) is also provided in parallel between the waste heat boiler (21) and the electrolytic cold dryer (8), the inlet of the steam cylinder (34) being connected to the upper portion of the waste heat boiler (21), and the outlet of the steam cylinder (34) being connected to the steam inlet of the sublimation drying subsystem (12) of the electrolytic cold dryer (8).

6. The electrolytic cold-drying incineration system for sludge according to claim 2, characterized in that: The dry sludge silo (16) is provided with a feeder to evenly deliver the dry sludge to the furnace feeding system (17).

7. The electrolytic cold-drying incineration system for sludge according to claim 3, characterized in that: The outlet of the waste heat boiler (21) is connected to the inlet of the electrostatic precipitator (25) through a pipeline.

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