A sludge treatment system

Abstract

The present invention discloses a sludge treatment system, comprising: a municipal sludge treatment system and an oily sludge treatment system. The municipal sludge treatment system at least comprises a bubbling fluidized bed for incinerating municipal sludge. The oily sludge treatment system at least comprises a continuous pyrolysis furnace and a liquid separation, cooling and pressure stabilization device. The continuous pyrolysis furnace is used to perform pyrolysis treatment on the oily sludge and obtain pyrolysis oil and gas. The liquid separation, cooling and pressure stabilization device separates combustible gas from the pyrolysis oil and gas, and the combustible gas output port of the liquid separation, cooling and pressure stabilization device is connected to the fuel inlet of the bubbling fluidized bed via a pipeline. In the sludge treatment system provided by the present invention, the auxiliary fuel required for incinerating municipal sludge in the bubbling fluidized bed is provided by the oily sludge treatment system, and there is no need to provide additional auxiliary fuel natural gas. In addition, the separated combustible gas of the oily sludge treatment system is lower in cost than the natural gas used in the prior art. Therefore, the sludge treatment system provided by the present invention effectively reduces the cost of incinerating municipal sludge.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and in particular to a sludge treatment system. Background Art

[0002] Municipal sludge is a residual solid product produced by domestic sewage treatment plants. It has high viscosity, high water content (about 80%) and low calorific value. Currently, the main methods for treating municipal sludge include landfill, land utilization, and incineration.

[0003] Among them, the sludge landfill method has the problems of large area occupation and secondary pollution. With the increasingly stringent environmental protection standards and the promotion of "zero-waste cities", the disadvantages of sludge landfill are more prominent and it is not a long-term solution.

[0004] Land use is the application of sewage sludge on the soil surface or in the soil by covering, spraying, injecting or incorporating to improve soil conditions or increase soil fertility. However, sewage sludge land use must meet three basic requirements:

[0005] 1. Sludge contains high levels of nutrients necessary for plants;

[0006] 2. The content of toxic and harmful substances in sludge shall not exceed the national standards for agricultural use of sludge;

[0007] 3. The sludge must undergo strict harmless treatment.

[0008] Therefore, the land use law has many restrictions, resulting in a large workload and a relatively complicated process.

[0009] Sludge incineration primarily involves mechanical dehydration and thermal drying pretreatment to increase the calorific value of the sludge. The sludge is then fed into coal-fired boilers, waste incinerators, cement kilns for co-incineration, or independently incinerated in fluidized beds. The flue gas heat is recovered and treated in a flue gas purification system until it meets standards before discharge. Therefore, incineration-based treatment is the most thorough sludge disposal method, effectively destroying organic matter and pathogens, avoiding secondary contamination from harmful substances and maximizing the harmlessness and reduction of municipal sludge.

[0010] The existing independent incineration technology for municipal sludge mainly uses discs, paddles, and thin-layer dryers to thermally dry sludge with a moisture content of 80%, and then sends it to a bubbling fluidized bed for incineration. The hot flue gas recovers heat through a high-temperature air preheater and a waste heat boiler, and then enters the flue gas purification system for dust removal and deacidification before being discharged.

[0011] However, due to the low calorific value and large fluctuations of municipal sludge in my country, the sludge incineration process needs to be supplemented with external auxiliary fuel natural gas to meet the incineration treatment requirements, which makes the existing sludge incineration method more expensive.

[0012] Therefore, how to reduce the cost of incineration of municipal sludge is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0013] In view of this, an object of the present invention is to provide a sludge treatment system to reduce the incineration cost of municipal sludge.

[0014] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0015] A sludge treatment system comprising:

[0016] A municipal sludge treatment system and an oily sludge treatment system, wherein the municipal sludge treatment system comprises at least a bubbling fluidized bed, and the bubbling fluidized bed is used for incineration treatment of municipal sludge;

[0017] The oily sludge treatment system includes at least a continuous pyrolysis furnace and a liquid separation, cooling and pressure stabilization device. The continuous pyrolysis furnace is used to pyrolyze the oily sludge and obtain pyrolysis oil and gas. The liquid separation, cooling and pressure stabilization device is used to process the pyrolysis oil and gas and separate the combustible gas. The combustible gas output port of the liquid separation, cooling and pressure stabilization device is connected to the fuel inlet of the bubbling fluidized bed through a pipeline.

[0018] Optionally, in the above sludge treatment system, the continuous pyrolysis furnace provides heat energy for pyrolyzing the oily sludge through a hot blast furnace, and the combustible gas output port of the liquid separation, cooling and pressure stabilization device is connected to the fuel inlet of the hot blast furnace through a pipeline.

[0019] Optionally, in the above sludge treatment system, the municipal sludge treatment system further comprises a municipal sludge pretreatment system, and the municipal sludge pretreatment system comprises a wet sludge storage bin, a dryer, a cyclone dust collector device and a condenser device;

[0020] The wet sludge storage bin is used to store municipal sludge and transport the municipal sludge to the dryer;

[0021] The dried tail gas output port of the dryer is connected to the air inlet of the cyclone dust collector device through a pipeline, and the dried sludge outlet of the dryer is connected to the bubbling fluidized bed through a conveying device;

[0022] The air inlet of the condenser device is communicated with the air outlet of the cyclone dust collector device through a pipeline, and the air outlet of the condenser device is communicated with the air inlet of the bubbling fluidized bed through a pipeline.

[0023] Optionally, in the above-mentioned sludge treatment system, the municipal sludge pretreatment system also includes a pre-furnace buffer hopper, the dried sludge outlet of the dryer is connected to the bubbling fluidized bed through the pre-furnace buffer hopper, the wet sludge storage bin is used to transport the municipal sludge to the pre-furnace buffer hopper, and the pre-furnace buffer hopper is used to process the dried sludge discharged from the dryer and the municipal sludge discharged from the wet sludge storage bin into semi-dry sludge, and transport the semi-dry sludge to the bubbling fluidized bed.

[0024] Optionally, in the above-mentioned sludge treatment system, the municipal sludge treatment system further comprises a high-temperature air preheater and a waste heat boiler, and the flue gas inlet of the high-temperature air preheater is connected to the incineration flue gas outlet of the bubbling fluidized bed through a pipeline;

[0025] The air outlet of the high-temperature air preheater is connected to the bubbling fluidized bed; the flue gas inlet of the waste heat boiler is connected to the flue gas outlet of the high-temperature air preheater, and the flue gas outlet of the waste heat boiler is connected to the exhaust gas treatment and emission system;

[0026] The water feed inlet of the waste heat boiler is used to connect to a water source, and the steam outlet of the waste heat boiler is connected to the steam inlet of the dryer.

[0027] Optionally, in the above-mentioned sludge treatment system, the hot air exhaust gas outlet of the continuous pyrolysis furnace is connected to the auxiliary heat input port of the waste heat boiler through a pipeline, so that the hot air exhaust gas discharged from the continuous pyrolysis furnace flows into the waste heat boiler, and the flue gas output port of the waste heat boiler is connected to the exhaust gas treatment and emission system.

[0028] Optionally, in the above-mentioned sludge treatment system, the heat exchange pipeline of the waste heat boiler is provided with a plurality of auxiliary heat input ports on different paths, and each of the auxiliary heat input ports is connected to the hot air exhaust gas outlet through a conveying branch, and the hot air exhaust gas outlet switches the connection status of each of the conveying branches through a switching valve.

[0029] Optionally, in the above-mentioned sludge treatment system, the tail gas treatment and emission system includes an electrostatic precipitator and a bag filter, and the tail gas outlet of the waste heat boiler is connected to the flue gas inlet of the electrostatic precipitator through a pipeline;

[0030] The smoke inlet of the bag filter is connected to the smoke outlet of the electrostatic precipitator, and the smoke outlet of the bag filter is connected to the chimney.

[0031] Optionally, in the above-mentioned sludge treatment system, a dry deacidification device and an activated carbon injection device are provided between the electrostatic precipitator and the bag filter, and the dry deacidification device and the activated carbon injection device are both connected to the flue between the electrostatic precipitator and the bag filter through pipelines;

[0032] The activated carbon injection device is located downstream of the dry deacidification device along the flue gas flow direction.

[0033] Optionally, in the above-mentioned sludge treatment system, the tail gas treatment and emission system further includes a wet tower, the flue gas outlet of the bag filter is connected to the air inlet of the wet tower through a pipeline, and the air outlet of the wet tower is connected to the chimney through a pipeline.

[0034] The present invention provides a sludge treatment system comprising a municipal sludge treatment system and an oily sludge treatment system. The bubbling fluidized bed of the municipal sludge treatment system incinerates the municipal sludge, and the fuel required for the bubbling fluidized bed incineration is provided by the combustible gas separated by the oily sludge treatment system.

[0035] The continuous pyrolysis furnace of the oily sludge treatment system pyrolyzes the oily sludge and obtains pyrolysis oil and gas, while the liquid separation, cooling and pressure stabilization device processes the pyrolysis oil and gas and separates the combustible gas. The combustible gas output port of the liquid separation, cooling and pressure stabilization device is connected to the fuel inlet of the bubbling fluidized bed through a pipeline, so that the bubbling fluidized bed can incinerate the municipal sludge.

[0036] Compared with the existing technology, in the sludge treatment system provided by the present invention, the auxiliary fuel required for the bubbling fluidized bed incineration of municipal sludge is provided by the oily sludge treatment system, and no additional auxiliary fuel is required, thereby saving fuel consumption outside the system. In addition, the combustible gas separated by the oily sludge treatment system is lower in cost than the natural gas used in the existing municipal sludge incineration. Therefore, the sludge treatment system provided by the present invention effectively reduces the incineration treatment cost of municipal sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic diagram of the process of a municipal sludge pretreatment system disclosed in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the treatment process of the municipal sludge bubbling fluidized bed incineration and the oily sludge continuous pyrolysis furnace disclosed in an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the process flow of the tail gas treatment and emission system disclosed in an embodiment of the present invention;

[0041] Figure 4This is a schematic diagram of the process of the sludge treatment system disclosed in an embodiment of the present invention.

[0042] Among them, 101 is a bubbling fluidized bed, 102 is a liquid separation, cooling and pressure stabilization device, 103 is a wet sludge storage bin, 104 is a dryer, 105 is a cyclone dust collector, 106 is a condenser, 107 is a pre-furnace buffer hopper, 108 is a high-temperature air preheater, 109 is a waste heat boiler, 110 is a hot blast furnace, 111 is an oily sludge silo, 112 is a continuous pyrolysis furnace, 113 is an electrostatic precipitator, 114 is a bag filter, 115 is a wet process tower, and 116 is a chimney. DETAILED DESCRIPTION

[0043] The core of the present invention is to provide a sludge treatment system to reduce the incineration cost of municipal sludge.

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Oily sludge mainly refers to oil sludge and oil sands produced in the production process of oil exploration and development and petrochemical industry. It is produced in large quantities, has high oil content and is difficult to treat. It is one of the main pollutants and pollution sources in oil production and poses a great threat to the environment. Therefore, the proper and safe disposal of oily sludge is particularly urgent.

[0046] Although oily sludge is listed as hazardous waste, it still possesses distinct energy properties. Current treatment and disposal technologies for oily sludge include chemical thermal washing, hydrothermal dehydration and oil extraction, drying, and pyrolysis / thermal desorption. Pyrolysis / thermal desorption involves decomposing oily sludge at high temperatures, where the organic polymer components undergo thermal decomposition and desorption to produce pyrolysis oil and gas. Further processing of the pyrolysis oil and gas yields combustible gas of high purity and stable composition. However, exhaust heat recovery is difficult and requires a separate flue gas purification system.

[0047] The inventors of this application have discovered that the large amount of combustible gas generated during the pyrolysis process of oily sludge can be used to provide the fuel required for the incineration of municipal sludge. Furthermore, in order to further optimize the treatment of tail gas from the pyrolysis process of oily sludge and achieve the coordinated treatment and comprehensive utilization of municipal sludge and oily sludge, the present invention discloses a sludge treatment system comprising a municipal sludge treatment system and an oily sludge treatment system.

[0048] like Figure 1As shown, the bubbling fluidized bed 101 of the municipal sludge treatment system performs combustion and decomposition treatment on the municipal sludge by incineration, and the auxiliary fuel required by the bubbling fluidized bed 101 is the combustible gas separated during the pyrolysis treatment of the oily sludge in the oily sludge treatment system.

[0049] The continuous pyrolysis furnace 112 of the oily sludge treatment system heats the oily sludge to 400°C ~ 600°C, and the organic polymer components of the oily sludge produce pyrolysis oil and gas under the action of thermal desorption, and the pyrolysis oil and gas are transported to the liquid separation, cooling and pressure stabilization device 102 through a pipeline. The liquid separation, cooling and pressure stabilization device 102 is composed of a liquid separation function part, a cooling function part and a pressure stabilization function part. The liquid separation, cooling and pressure stabilization device 102 processes the pyrolysis oil and gas to obtain combustible gas with high purity and stable composition, and the combustible gas output port of the liquid separation, cooling and pressure stabilization device 102 is connected to the fuel inlet of the bubbling fluidized bed 101 through a pipeline to transport the combustible gas to the auxiliary burner of the bubbling fluidized bed 101. The auxiliary burner is arranged in the dilute phase zone of the bubbling furnace of the bubbling fluidized bed 101, thereby assisting the municipal sludge incineration flue gas to reach 850°C and realize harmless disposal.

[0050] To fully utilize the combustible gas separated by the oily sludge treatment system, the combustible gas outlet of the liquid separation, cooling, and pressure stabilization device 102 is also equipped with a pipeline connected to the fuel inlet of the hot blast furnace 110 to transport a portion of the combustible gas to the hot blast furnace 110. After the oily sludge is transferred from the oily sludge silo 111 to the continuous pyrolysis furnace 112, the hot blast furnace 110 burns the combustible gas to provide heat energy for the continuous pyrolysis furnace 112 to pyrolyze the oily sludge. This also reduces the hot blast furnace 110's demand for external fuel.

[0051] like Figure 1 As shown, in order to improve the thoroughness of the municipal sludge treatment system, the municipal sludge treatment system also includes a municipal sludge pretreatment system, which includes a wet sludge storage bin 103, a dryer 104, a cyclone dust collector device 105 and a condenser device 106.

[0052] The wet sludge storage silo 103 is used to store municipal sludge and transport it to the dryer 104. The municipal sludge stored in the wet sludge storage silo 103 has a moisture content of approximately 80%. To increase the calorific value of the municipal sludge, the dryer 104 uses high-temperature steam to dry the municipal sludge. The resulting moisture content is approximately 30% to 40%. The dryer 104 then transports the dried sludge via a conveyor to the dense phase zone of the bubbling furnace of the bubbling fluidized bed 101 for incineration.

[0053] The dryer 104 disclosed in this embodiment is an indirect heat exchange type sludge dryer using saturated steam as a heat source, and may adopt a disc dryer, a paddle dryer or a thin layer dryer, or those skilled in the art may design other types of dryers according to actual needs, such as a low-temperature belt dryer, etc., which will not be listed one by one in this article.

[0054] The dried tail gas generated during the process of drying municipal sludge in the dryer 104 is transported to the cyclone dust collector device 105 through a pipeline connecting the output port of the dryer 104 and the air inlet of the cyclone dust collector device 105. The cyclone dust collector device 105 is then transported to the condenser device 106 through a pipeline. After dust removal and condensation, the dried tail gas is output by the condenser device 106 as dried tail gas containing non-condensable odor, and the air outlet of the condenser device 106 is connected to the air inlet of the dilute phase zone of the bubbling fluidized bed 101 through a pipeline, so that the non-condensable odor enters the dilute phase zone of the bubbling furnace of the bubbling fluidized bed 101.

[0055] Furthermore, the pipeline is arranged to be tangentially connected to the cavity wall of the bubbling fluidized bed 101, so that the dried tail gas containing non-condensable odors flows tangentially into the dilute phase zone of the bubbling furnace, generating relatively strong airflow disturbances within the dilute phase zone of the bubbling furnace. This in turn strengthens the mixing of the air mass and the unburned solid fine particles of the municipal sludge, replenishing the air required for sludge incineration while improving combustion efficiency and promoting the combustion and decomposition of harmful non-condensable odors in the sludge and dried tail gas. Therefore, the incineration of the dried sludge in the dense phase zone of the bubbling furnace and the incineration of the dried tail gas containing unburned solid fine particles of the municipal sludge in the dilute phase zone of the bubbling furnace are multi-layered staged combustion, thereby minimizing the concentration of NOx (nitrogen oxides) emissions.

[0056] To improve the efficiency of municipal sludge incineration and purification, the municipal sludge pretreatment system is also equipped with a pre-furnace buffer hopper 107. The dried sludge after drying in the dryer 104 and the municipal sludge from the wet sludge storage bin 103 are both conveyed to the pre-furnace buffer hopper 107. The pre-furnace buffer hopper 107 processes the dried sludge discharged from the dryer 104 and the municipal sludge discharged from the wet sludge storage bin 103 into semi-dry sludge, which is then conveyed to the bubbling fluidized bed 101.

[0057] like Figure 2 As shown, the bubbling fluidized bed 101 will generate high-temperature incineration flue gas during the incineration process. In order to improve the utilization rate of thermal energy and avoid the heat energy loss of the incineration flue gas, the municipal sludge treatment system also includes a high-temperature air preheater 108 and a waste heat boiler 109.

[0058] The flue gas inlet of the high-temperature air preheater 108 is connected to the combustion flue gas outlet of the bubbling fluidized bed 101 through a pipeline, so that the combustion flue gas enters the high-temperature air preheater 108. After the external air enters the high-temperature air preheater 108 through the air inlet of the high-temperature air preheater 108, the high-temperature combustion flue gas heats the air. After the air temperature rises to 200°C to 600°C, it flows into the bubbling fluidized bed 101 through the air outlet of the high-temperature air preheater 108 through the pipeline. After passing through the wind chamber and air distribution device in the bubbling fluidized bed 101, it enters the dense phase zone of the bubbling furnace of the bubbling fluidized bed 101, providing high-temperature air for the incineration of semi-dry sludge in the dense phase zone of the bubbling furnace, thereby facilitating the sufficient incineration of the semi-dry sludge.

[0059] The flue gas inlet of waste heat boiler 109 is connected to the flue gas outlet of high-temperature air preheater 108, allowing the incineration flue gas to flow into waste heat boiler 109. Feed water enters waste heat boiler 109 through its feed water inlet, where the incineration flue gas in waste heat boiler 109 heats the water to 1 MPa saturated steam. The steam outlet of waste heat boiler 109 is connected to the steam inlet of dryer 104, allowing the saturated steam generated by waste heat boiler 109 to replenish the steam required by dryer 104 after passing through the temperature and pressure reduction device. At this point, the flue gas temperature in waste heat boiler 109 drops to approximately 220°C. The flue gas then enters the exhaust gas treatment and exhaust system through a pipeline connecting the flue gas outlet of waste heat boiler 109 to the exhaust gas treatment and exhaust system for purification.

[0060] In a specific implementation, steam drainage after the dryer 104 dries the municipal sludge is transported back to the waste heat boiler 109 as feed water, thereby improving the recycling rate of water within the municipal sludge treatment system.

[0061] like Figure 2 As shown, in order to further recycle and utilize the waste heat of the hot air exhaust gas from the continuous pyrolysis furnace 112 and provide sufficient thermal energy for the waste heat boiler 109 to generate water vapor, the hot air exhaust gas outlet of the continuous pyrolysis furnace 112 is connected to the auxiliary heat input port of the waste heat boiler 109 through a pipeline, so that the hot air exhaust gas discharged from the continuous pyrolysis furnace 112 flows into the waste heat boiler 109, thereby heating the water inside the waste heat boiler 109 and increasing the steam production of the waste heat boiler 109 to make up for the insufficient steam required by the dryer 104. This realizes the recycling and synergy of thermal energy in the municipal sludge drying and incineration process and the oily sludge pyrolysis process, significantly improving the utilization rate of thermal energy in the sludge treatment process. Similarly, the flue gas outlet of the waste heat boiler 109 is connected to the exhaust gas treatment and exhaust system, so that the hot air exhaust gas from the continuous pyrolysis furnace 112 enters the exhaust gas treatment and exhaust system, thereby allowing the municipal sludge and oily sludge exhaust gas to share a set of exhaust gas treatment and exhaust systems, improving the utilization rate of the exhaust gas treatment and exhaust system and reducing the exhaust gas treatment cost.

[0062] Furthermore, in order to improve the thermal energy utilization rate of the waste heat boiler 109 for hot air exhaust gases of different temperatures, the heat exchange pipeline of the waste heat boiler 109 is provided with multiple auxiliary heat input ports on different flue gas paths, and each auxiliary heat input port is connected to the hot air exhaust gas outlet through a transmission branch. The hot air exhaust gas outlet switches the connection state of each transmission branch through a switching valve, thereby adjusting the position of the hot air exhaust gas entering the flue gas side of the waste heat boiler 109 according to the different temperatures of the hot air exhaust gas, so that the hot air exhaust gas enters from the municipal sludge incineration flue gas side with a temperature similar to its own, thereby maximizing the utilization of waste heat.

[0063] like Figure 3 As shown, in a specific embodiment, the exhaust gas treatment and emission system for treating exhaust gas includes an electrostatic precipitator 113 and a bag filter 114. The exhaust gas outlet of the waste heat boiler 109 is connected to the flue gas inlet of the electrostatic precipitator 113 via a pipeline, while the flue gas inlet of the bag filter 114 is connected to the flue gas outlet of the electrostatic precipitator 113. Finally, the flue gas outlet of the bag filter 114 is connected to a chimney 116, which discharges the purified exhaust gas. Alternatively, other dust removal devices are designed in the art based on actual needs, and are not listed here.

[0064] To further remove harmful gases such as acid from the exhaust, the exhaust gas treatment and emission system is equipped with a dry deacidification device and an activated carbon injection device. Both devices are connected to the flue between the electrostatic precipitator 113 and the bag filter 114 via pipelines. Deacidification materials and activated carbon are injected into the pipeline to purify the flue gas. The activated carbon injection device is located downstream of the dry deacidification device along the flue gas flow direction.

[0065] In another specific embodiment, in order to further remove acidic gases in the exhaust gas, a wet tower 115 is further provided in the exhaust gas treatment and emission system. The wet tower 115 is provided between the bag dust collector 114 and the chimney 116, and the flue gas outlet of the bag dust collector 114 is connected to the air inlet of the wet tower 115 through a pipeline, and the air outlet of the wet tower 115 is connected to the chimney 116 through a pipeline, thereby performing wet deacidification on the exhaust gas so that the gas discharged from the chimney 116 meets the emission standards.

[0066] like Figure 4 As shown, the sludge treatment system disclosed in this embodiment processes the pyrolysis residue discharged from the continuous pyrolysis furnace 112, the slag produced by the bubbling fluidized bed 101 and the fly ash filtered by the electrostatic precipitator 113 together with cement, stone chips and other materials into brick building materials, so as to recycle the pyrolysis residue, slag and fly ash, thereby improving the terminal resource utilization rate of the coordinated disposal of municipal sludge and oily sludge. The sludge treatment system disclosed in this embodiment realizes the triple synergy of energy, materials and environmental protection.

[0067] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0068] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0069] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0070] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0071] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A sludge treatment system, characterized in that: include: A municipal sludge treatment system and an oily sludge treatment system, wherein the municipal sludge treatment system comprises at least a bubbling fluidized bed (101), and the bubbling fluidized bed (101) is used for incineration treatment of municipal sludge; The oily sludge treatment system comprises at least a continuous pyrolysis furnace (112) and a liquid separation, cooling and pressure stabilization device (102), wherein the continuous pyrolysis furnace (112) is used to perform pyrolysis treatment on the oily sludge and obtain pyrolysis oil and gas, and the liquid separation, cooling and pressure stabilization device (102) is used to process the pyrolysis oil and gas and separate out combustible gas, and the combustible gas output port of the liquid separation, cooling and pressure stabilization device (102) is connected to the fuel inlet of the bubbling fluidized bed (101) through a pipeline; The municipal sludge treatment system further comprises a municipal sludge pretreatment system, which comprises a wet sludge storage bin (103), a dryer (104), a cyclone dust collector device (105) and a condenser device (106); the wet sludge storage bin (103) is used to store municipal sludge and transport the municipal sludge to the dryer (104); the output port of the dryer (104) is connected to the air inlet of the cyclone dust collector device (105) through a pipeline, and the dried sludge outlet of the dryer (104) is connected to the bubbling fluidized bed (101) through a conveying device; the air inlet of the condenser device (106) is connected to the air outlet of the cyclone dust collector device (105) through a pipeline, and the air outlet of the condenser device (106) is connected to the air inlet of the bubbling fluidized bed (101) through a pipeline; The municipal sludge treatment system further includes a high-temperature air preheater (108) and a waste heat boiler (109), wherein the flue gas input port of the high-temperature air preheater (108) is connected to the incineration flue gas output port of the bubbling fluidized bed (101) through a pipeline; the air outlet of the high-temperature air preheater (108) is connected to the bubbling fluidized bed (101); the flue gas input port of the waste heat boiler (109) is connected to the flue gas output port of the high-temperature air preheater (108), and the flue gas outlet of the waste heat boiler (109) is connected to the tail gas treatment and emission system; the water inlet of the waste heat boiler (109) is used to connect to a water source, and the steam outlet of the waste heat boiler (109) is connected to the steam inlet of the dryer (104).

2. The sludge treatment system according to claim 1, characterized in that: The continuous pyrolysis furnace (112) provides heat energy for pyrolyzing the oily sludge via the hot blast furnace (110), and the combustible gas output port of the liquid separation, cooling and pressure stabilization device (102) is connected to the fuel inlet of the hot blast furnace (110) via a pipeline.

3. The sludge treatment system according to claim 1, characterized in that: The municipal sludge pretreatment system further includes a pre-furnace buffer hopper (107), the dried sludge outlet of the dryer (104) is connected to the bubbling fluidized bed (101) through the pre-furnace buffer hopper (107), the wet sludge storage bin (103) is used to transport the municipal sludge to the pre-furnace buffer hopper (107), and the pre-furnace buffer hopper (107) is used to process the dried sludge discharged from the dryer (104) and the municipal sludge discharged from the wet sludge storage bin (103) into semi-dry sludge, and transport the semi-dry sludge to the bubbling fluidized bed (101).

4. The sludge treatment system according to claim 1, characterized in that: The hot air tail gas outlet of the continuous pyrolysis furnace (112) is connected to the auxiliary heat input port of the waste heat boiler (109) through a pipeline, so that the hot air tail gas discharged from the continuous pyrolysis furnace (112) flows into the waste heat boiler (109).

5. The sludge treatment system according to claim 4, characterized in that: The heat exchange pipeline of the waste heat boiler (109) is provided with a plurality of auxiliary heat input ports on different paths, and each of the auxiliary heat input ports is connected to the hot air exhaust gas outlet via a delivery branch, and the hot air exhaust gas outlet switches the connection state of each of the delivery branches via a switching valve.

6. The sludge treatment system according to claim 5, characterized in that: The tail gas treatment and emission system includes an electrostatic precipitator (113) and a bag filter (114), and the tail gas outlet of the waste heat boiler (109) is connected to the flue gas inlet of the electrostatic precipitator (113) through a pipeline; The smoke inlet of the bag filter (114) is in communication with the smoke outlet of the electrostatic precipitator (113), and the smoke outlet of the bag filter (114) is in communication with the chimney (116).

7. The sludge treatment system according to claim 6, characterized in that: A dry deacidification device and an activated carbon injection device are provided between the electrostatic precipitator (113) and the bag filter (114), and both the dry deacidification device and the activated carbon injection device are connected to the flue between the electrostatic precipitator (113) and the bag filter (114) through pipelines; The activated carbon injection device is located downstream of the dry deacidification device along the flue gas flow direction.

8. The sludge treatment system according to claim 7, characterized in that: The tail gas treatment and emission system further comprises a wet tower (115), the flue gas outlet of the bag filter (114) is connected to the air inlet of the wet tower (115) through a pipeline, and the air outlet of the wet tower (115) is connected to the chimney (116) through a pipeline.

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