Sludge treatment system for discharging and recycling sludge

Abstract

The invention relates to the field of sludge discharge, in particular to a sludge treatment system for sludge discharge and recovery, which comprises a pretreatment box for sludge primary treatment; the filter pressing equipment is connected with the pretreatment box and is used for squeezing sludge moisture; the drying equipment is internally provided with a drying bin for drying sludge, the drying bin comprises a first area and a second area, and the second area is communicated with the filter pressing equipment; the incineration equipment communicates with the first area in the drying bin and is used for incinerating harmful substances in the sludge; the heat supply equipment is communicated with the drying bin and is used for supplying hot air to the drying bin; the waste gas bin is communicated with the drying bin and is used for collecting harmful flue gas in the drying bin; and the packaging equipment is communicated with the second area of the drying bin and is used for packaging the treated sludge. The method has the effects that the economic benefit of a sludge discharge plant is improved, and the resource utilization condition of sludge is provided while sewage is treated.

Description

Technical Field

[0001] The present application relates to the field of sludge discharge, and in particular to a sludge treatment system for sludge discharge and recovery. Background Art

[0002] Sludge is a water-containing solid sediment produced during the sludge discharge process, which includes a large number of harmful substances, such as volatile organic impurities, pathogens (bacteria, viruses and parasite eggs, etc.) and toxic substances (such as cyanide, mercury, chromium or some difficult to decompose toxic organic matter). If not treated, these harmful substances may cause serious pollution to the environment, such as contaminating surface and groundwater, destroying the nutrient balance of plants, and even spreading odor through the air to cause air pollution.

[0003] At the same time, in addition to harmful substances, sludge also includes useful substances such as plant nutrients and organic matter, which can be used as agricultural fertilizers, soil conditioners or for energy production, etc. Therefore, in order to protect the environment, reduce pollution and make full use of the useful substances in sludge, the sludge must be properly treated.

[0004] Sludge treatment systems are usually installed inside sludge discharge plants to concentrate, dehydrate, stabilize and dry the sludge produced during sludge discharge to meet national emission standards. In densely populated cities, the amount of sewage generated is large. While safely, environmentally friendly and efficiently treating the sludge treatment system, the stable recycling of the usable substances retained in the sewage can significantly improve economic benefits.

[0005] However, adding equipment for recovering beneficial substances during sludge discharge will increase energy consumption. In comparison, the economic benefits brought by the recovery of beneficial substances are not obvious. Therefore, most sludge discharge plants will not add wastewater resource recovery equipment.

[0006] Therefore, from the perspective of reducing energy consumption, a sludge treatment system is designed for the sludge discharge plant, which has two sludge discharge lines: pollution treatment and recycling. Summary of the invention

[0007] In order to improve the economic benefits of sludge discharge plants and provide conditions for resource utilization of sludge while treating sewage, the present application provides a sludge treatment system for sludge discharge and recovery.

[0008] The sludge treatment system for sludge discharge and recovery provided in this application adopts the following technical solution: A sludge treatment system for sludge discharge and recovery, comprising a pretreatment tank, the pretreatment tank being used for preliminary sludge treatment, and further comprising; A filter press device, connected to the pretreatment box, used to squeeze out moisture from the sludge; A drying device, wherein a drying bin for sludge drying is provided inside, the drying bin comprising a first area and a second area, the second area being connected to the filter press device; Incineration equipment, connected to the first area in the drying bin, used to incinerate harmful substances in the sludge; A heating device, connected to the drying bin, to provide hot air to the drying bin; A waste gas bin connected to the drying bin and used to collect harmful smoke in the drying bin; The packaging equipment is connected to the second area of ​​the drying bin and is used for packaging the processed sludge.

[0009] By adopting the above technical solution, the filter press equipment, drying equipment, incineration equipment and packaging equipment form a sludge discharge line, wherein the filter press equipment, drying equipment and incineration equipment form a sludge incineration line, incinerating the harmful substances that cannot be recovered in the sludge to avoid the pollution of the environment and the atmosphere caused by the discharge; the filter press equipment, drying equipment and packaging equipment form a sludge recovery line for the beneficial substances in the sludge, which are sealed and processed by the packaging equipment after drying and transported to the subsequent production line to convert the sludge containing the beneficial substances into waste or other resource products; Before the above-mentioned sludge discharge line and sludge recovery line, both need to pass through the pretreatment box. The sewage entering the sludge treatment system is pumped into the sludge discharge box for pretreatment. The sewage pretreatment includes mixing, dosing, regulation, stirring, filtering and other links. The appropriate reagents and regulators are selected to increase the solid content and drying effect of the sludge, ensure the uniformity of the sludge, and filter out large volumes of solid waste. The pollutants that pass the pretreatment should only contain sewage and sludge. The part with nutrients after pretreatment is transported to the subsequent pressing part. The harmful substances are precipitated to the bottom of the pretreatment box by selecting appropriate reagents and regulators. The recyclable sludge after pretreatment enters the subsequent filter press equipment. The internal space of the filter press equipment is reduced, squeezing the sludge and squeezing out the sewage. The pollutants should be squeezed into mud blocks after being discharged from the filter press equipment. The mud blocks are transported to the second area of ​​the drying equipment. The drying bin inside the drying equipment is divided into the first area and the second area. The first area is used for sludge discharge and the second area is used for sludge recovery. The heating equipment supplies hot air to the inside of the drying equipment to dry the sludge inside the drying equipment, reduce the water content in the sludge, and harden it into soil blocks, which are then sent to the subsequent packaging equipment for packaging and storage. The staff sends the stored soil blocks to the subsequent production line in batches. During the pretreatment process, the precipitated and flocculated substances under the action of the reagents are filtered to the bottom of the pretreatment box and transported to the first area of ​​the drying bin. After being dried by the heating equipment, they are transported to the subsequent incinerator to incinerate the unusable harmful substances. The waste gas after combustion is discharged into the waste gas bin for collection; In summary, the above-mentioned drying bin inside the drying equipment is divided into two parts, so that the sludge treatment and sludge recovery can be carried out simultaneously, one set of heating equipment supplies two lines for simultaneous operation, and one set of drying bin supplies sludge for simultaneous transportation on two lines, thereby achieving initial cost savings, and then multiple conveyor belts are arranged in the drying bin to extend the transportation path of the sludge blocks, so as to compensate for the impact of the reduction in the transportation path caused by the reduction in the volume of the drying bin.

[0010] Optionally, the first area in the drying bin is connected to the second area.

[0011] By adopting the above technical solution, the first area is connected with the second area to realize the circulation of air in the drying bin. If the first area and the second area are relatively closed and isolated, the heating equipment needs to be connected with the first area and the second area respectively, and the first area and the second area need to be additionally provided with a channel connected with the exhaust bin to exhaust the air inside each area respectively; Therefore, opening up the first area and the second area to allow the high-temperature hot air to freely communicate between the two areas of the drying bin can achieve the same technical effect as the above-mentioned solution in which the first area and the second area are relatively closed and the heating equipment is independently connected, and the connection between the first area and the second area can save costs in terms of structure; However, in order to ensure the high-temperature drying effect, it is recommended that in actual application, the heating equipment is provided with connecting pipes corresponding to the first area and the second area to ensure heating of the two areas.

[0012] Optionally, the smoke outlet of the incinerator is connected to the first area and the second area of ​​the drying bin.

[0013] By adopting the above technical solution, the first area of ​​the drying bin is used to dry the harmful substances in the sludge that cannot be recycled. The first area of ​​the drying bin is connected to the incinerator to incinerate the dried harmful substances. The combustion of the harmful substances will produce high-temperature harmful flue gas. Although the gaseous substances are harmful to the human body, the heat energy of the high-temperature harmful flue gas can be effectively utilized. Therefore, the high-temperature flue gas is refluxed into the first area and the second area of ​​the drying bin through the smoke outlet of the incinerator, saving the energy consumption of the heating equipment. It should be noted that during the drying process, harmful fumes exist in the drying chamber. The evaporation of water vapor causes most of the harmful substances to be adsorbed in the water vapor or in the liquefied small droplets on the inner wall of the drying chamber. When the water in the drying chamber is discharged, the harmful substances are discharged along with it. A small part of the harmful substances also remain in the sludge. After the sludge recovery process is completed, the relevant personnel will deal with the harmful substances when they process the sludge as a resource. Harmful substances in sludge include pathogenic microorganisms such as bacteria and viruses, harmful substances such as difficult-to-degrade polymers, and some heavy metal substances. If these harmful substances are directly buried or discarded without treatment, they are easy to pollute the environment. Therefore, the harmful substances are incinerated before discharge to become harmful flue gas that can be collected in the waste gas bin. Technicians will collect the solid sludge left at the bottom of the incinerator after incineration.

[0014] Optionally, it also includes; A filter water tank, connected to the filter press equipment, accommodating wastewater in the sludge discharge process of the filter press equipment; The waste gas bin is provided with: An exhaust gas treatment device is connected to the water filter box.

[0015] By adopting the above technical solution, the above incinerator discharges the combustion flue gas generated by the burning of harmful substances into the drying bin and finally flows into the waste gas bin. The direct discharge of harmful flue gas will pollute the air environment. Therefore, a waste gas treatment device is set in the waste gas bin to treat the harmful flue gas discharged into the waste gas bin to meet the emission standards and reduce air pollution. Since the main components of harmful flue gas generated by the incineration of harmful substances are nitrogen oxides and sulfur dioxide, etc., SNCR denitrification technology and acid gas removal must be applied in the incinerator. Denitrification is to spray urea solution into the incinerator to react with nitrogen oxides in the flue gas to reduce nitrogen oxides to nitrogen; deacidification is to spray strong oxidants and alkaline substances by spraying, washing, etc. to neutralize the acid gas in the flue gas in the tail gas bin; whether it is denitrification or deacidification, water is needed to dissolve the corresponding denitrification and deacidification substances. Therefore, the exhaust gas treatment device is connected to the water filter box, which provides water for the exhaust gas treatment device to reduce the water resource consumption in the exhaust gas treatment process; In the above scheme, the water filter tank is one of the important components of the system. The water squeezed out of the sludge by the filter press equipment flows into the water filter tank from the bottom of the filter press equipment for storage. In addition, during the drying process in the dry water bin, the moisture dried from the sludge is also discharged into the water filter tank. The staff adds relevant reagents and flocculants into the water filter tank to purify the water in the water filter tank. The purified water is one of the sources of consumable water for denitrification and deacidification in the waste gas bin.

[0016] Optionally, exhaust ducts are provided at the outlet and the inlet of the drying equipment.

[0017] By adopting the above technical scheme, taking into account the need for sludge transportation, the drying equipment is in an unsealed state and has a transportation channel that is the same as the outside world. Harmful gases may diffuse into the room through the transportation channel and affect the health of the workers. Therefore, exhaust pipes are provided at the input and output ports of the drying equipment corresponding to the sludge to discharge the harmful gases in the connecting port between the drying equipment and the outside world. Furthermore, a vacuum device may be provided at the above-mentioned exhaust pipe to actively extract the gas that is about to diffuse to the outside world to prevent it from diffusing to the outside.

[0018] Optionally, the water filter tank is connected to the incinerator. By adopting the above technical scheme, in addition to incinerating the harmful substances from the first area of ​​the drying bin, the above incinerator also needs to incinerate the magazines filtered from the water filter box. The staff regularly adds flocculants and specific agents to the water filter box to remove the newly flowing harmful substances in the water filter box. The harmful substances slowly sink to the bottom and are regularly collected by the staff and transported to the incinerator through the specific water filter box and the specific conveying channel of the incinerator. The harmful gases generated after incineration in the incinerator are then discharged through the drying bin and the exhaust gas bin.

[0019] Optionally, the gas outlet of the waste gas bin is connected to the drying bin.

[0020] By adopting the above technical solution, the high-temperature flue gas that meets the denitrification and desulfurization standards in the waste gas bin still contains a large amount of heat energy. A part of the flue gas is directly discharged after subsequent deodorization and filtration, and the other part can be returned to the drying bin again. The heat energy of this part of the gas is utilized, and the harmful gas content in the drying bin is reduced by the gas after denitrification and desulfurization, thereby reducing the burden of waste gas treatment in the subsequent waste gas bin; In practical applications, it should be noted that the gas inflow rate from the waste gas bin in the drying bin should be lower than the gas inflow rate from the incinerator to avoid disrupting the forward flow direction of the gas.

[0021] Optionally, the drying bin is provided with: A plurality of drying belts are horizontally arranged in the first area and the second area and vertically distributed along the inner wall of the drying bin. Adjacent drying belts in the first area or the second area are alternately distributed on opposite side walls to form a sludge conveying channel.

[0022] By adopting the above technical scheme, the drying belt plays the role of transporting sludge in the drying bin. The drying belt can adopt an ordinary conveyor belt. When the sludge is transported in the drying bin, multiple drying belts are alternately distributed on the opposite side walls, so that the sludge is transported back and forth in the drying bin, extending the sludge transportation path. During the sludge transportation process, the staff needs to preset the conveying speed of the drying belt to give the sludge sufficient drying time.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The products of built-in devices in the sludge treatment system can be refluxed and supplied as the source of system consumption products, thereby reducing energy consumption costs. For example, the water in the filter tank is used as the source of water for denitrification and deacidification in the waste gas bin. For example, the high-temperature flue gas in the incinerator and the waste gas bin can be used to provide a source of heat energy in the drying bin. 2. The drying bin is divided into two parts, one for sludge recovery and the other for sludge discharge. The two parts are connected and heated by a unified heating equipment. Without adding additional equipment, the two lines of sludge can be dried simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0025] Figure 2 This is a cross-sectional view made to highlight the interior of the drying box in the embodiment of the present application.

[0026] Figure 3 This is a cross-sectional view made in the embodiment of the present application to highlight the interior of the heating box.

[0027] Figure 4 This is a schematic diagram of the overall structure from another angle in the embodiment of the present application to highlight the water filter box.

[0028] Explanation of the reference numerals: 1. Pretreatment box; 2. Filter press equipment; 21. Belt filter press; 3. Drying equipment; 31. Drying box; 32. Drying bin; 321. First area; 322. Second area; 33. Drying belt; 34. Safety bin; 4. Heating box; 41. Electric heating pipe; 5. Packaging equipment; 6. Incineration equipment; 61. Incinerator; 7. Waste gas bin; 8. Water filter tank. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The present application embodiment discloses a sludge treatment system for sludge discharge and recovery. Figure 1 A sludge treatment system for sludge discharge and recovery includes a pretreatment box 1, a filter press 2, a drying equipment 3, a heating equipment, an incineration equipment 6, a waste gas bin 7, a water filter box 8 and a packaging equipment 5. The above multiple devices or multiple devices are interconnected and work in coordination to form the sludge treatment system of this embodiment.

[0031] Reference Figure 1The pretreatment tank 1 is connected to the sewage treatment system of the front-end sewage treatment plant and is the front-end node of the sludge treatment system of this embodiment. The sludge filtered out during the sewage treatment system's sewage purification process is extracted into the pretreatment tank 1 for temporary storage, which is the sludge source of the sludge treatment system. However, the sludge cannot flow directly into the subsequent equipment and devices of the system. Relevant staff members need to perform pretreatment steps in the pretreatment tank 1 regularly to make the sludge meet the subsequent treatment conditions. These pretreatment steps include adding medicine, adjusting, stirring, filtering, etc. to ensure the uniformity and stability of the sludge. First, relevant staff members need to select appropriate agents and regulators according to the sludge composition detected at the front end of the sewage treatment plant and the given treatment requirements to prepare for the subsequent drying of the sludge. Secondly, the sludge after adding medicine in the pretreatment tank 1 should be filtered and treated to filter out the harmful parts of the sludge that are difficult to treat and recycle in the pretreatment tank 1, and the remaining treatable parts should be stirred evenly and prepared to be transported to the subsequent equipment and devices of the sludge treatment system.

[0032] Reference Figure 1 , the filter press equipment 2 is connected to the pretreatment box 1, and the processable and recyclable part stirred evenly in the pretreatment box 1 is squeezed to squeeze out a large amount of water contained in the sludge, and the sludge with high fluidity is squeezed into wet mud blocks, which is convenient for the subsequent process. In any embodiment of the present application, the filter press equipment 2 can adopt a common belt filter press 21, and in this embodiment, the filter press equipment 2 adopts a belt filter press 21 with high filtration efficiency and adapted to an automated production line. A conveyor belt connecting the belt filter press 21 and the drying equipment 3 is provided at the outlet of the belt filter press 21, and the wet mud blocks squeezed out of the belt filter press 21 are conveyed to the inside of the drying equipment 3 through the conveyor belt.

[0033] Reference Figure 1 and Figure 2 The drying device 3 is arranged on one side of the pretreatment box 1 and the belt filter press 21. In this embodiment, the drying box 31 is the main part of the drying device 3, and a drying bin 32 is provided inside the drying box. The wet mud blocks from the belt filter press 21 are transported from the conveyor belt to the drying bin 32, where they are dried to remove moisture from the wet mud blocks. The internal area of ​​the drying bin 32 is divided into two identical areas, a first area 321 and a second area 322. The first area 321 is used to dry the harmful part of the sludge that is difficult to treat and recycle that is directly filtered out of the pretreatment box 1, and the second area 322 is used to dry the wet mud blocks transported from the belt filter press 21.

[0034] Reference Figure 1 and Figure 2In the first area 321 and the second area 322 of the drying box 31, multiple conveyor belts, which are drying belts 33, are horizontally arranged. The multiple drying belts 33 in the same area are evenly spaced along the vertical direction, and two vertically adjacent drying belts 33 in the same area are alternately fixed on the side walls of the opposite sides. Therefore, the drying belts 33 in the first area 321 or the second area 322 form multiple "S-shaped" return conveying channels in the same area. The sludge entering the drying box 31 can be transported along the longest path in the first area 321 or the second area 322, thereby increasing the drying time in the drying box 31 and ensuring the drying quality.

[0035] Reference Figure 1 and Figure 2 Among the above-mentioned multiple drying belts 33, the drying belts 33 at the top of the first area 321 and the second area 322 are both input drying belts 33 of the drying bin 32, and the drying belts 33 at the bottom of the first area 321 and the second area 322 are both output drying belts 33 of the drying bin 32. The side walls of the first area 321 and the second area 322 of the drying box 31 opposite to each other are provided with conveying openings at the top and bottom of the side walls corresponding to the top and bottom of the side walls. The top and bottom drying belts 33 in the first area 321 of the drying box 31 and the top and bottom drying belts 33 in the second area 322 of the drying box 31 extend their respective corresponding conveying openings, so that the input and output drying belts 33 in the two areas of the drying bin 32 can be connected to other equipment to complete the sludge transportation before and after drying.

[0036] Reference Figure 1 and Figure 3 A heating box 4 is formed on one side wall of the drying box 31. In any embodiment of the present application, a space for arranging a heating component is opened in the heating box 4. The staff can arrange the heating component inside the heating box 4 according to actual conditions. The heating component can be an ordinary electric heating pipe 41, a PTC heater, a water heating pipe, etc. In this embodiment, a heating pipe is selected, and multiple heating pipes are arranged horizontally, and both ends are fixed to the inner walls of the opposite sides of the heating box 4; a fan is arranged on one side of the heating box 4, and the fan is connected to the inside of the heating box 4. The fan supplies air to the inside of the heating box 4. After being heated by the electric heating pipe 41, the inside of the heating box 4 is filled with high-temperature hot air; at one side wall where the heating box 4 and the drying box 31 are integrally formed, the first area 321 and the second area 322 corresponding to the drying box 31 are respectively provided with channels for allowing the hot air inside the heating box 4 to enter the drying box 31, thereby, the hot air in the heating box 4 enters the drying box 31, providing high-temperature hot air for drying the sludge in the drying box 31.

[0037] Reference Figure 1The packaging equipment 5 is arranged in the drying box 31. The packaging equipment 5 can be a granulator, a packaging machine, etc., which can crush or package the dried soil. In this embodiment, a packaging machine is taken as an example. The feed port on one side of the packaging machine extends to the end of the drying belt 33 for sludge output at the bottom of the second area 322. The sludge transported from the drying belt 33 falls directly into the packaging machine through the feed port.

[0038] Reference Figure 1 and Figure 4 The filter water box 8 is arranged between the belt filter press 21 and the drying box 31, and is used to contain the water pressed out by the belt filter press 21; in order to realize the positive flow of water into the filter water box 8, the height of the top of the water box is lower than the height of the bottom of the belt filter press 21, and the top of the water box is connected to the bottom of the belt filter press 21. Since there are still a lot of harmful substances in the water filtered out by the belt filter press 21, these harmful substances will flow into the filter water box 8 together with the water flow of the belt filter press 21. Therefore, the technicians should regularly put customized agents into the filter water box 8 for the harmful substances to purify the water in the filter water box 8.

[0039] Reference Figure 1 The incineration equipment 6 is arranged on the side of the drying box 31 away from the belt filter press 21, and includes an incinerator 61. The incinerator 61 is connected to the first area 321 of the drying box 31, and the harmful part of the sludge that is difficult to handle and recovered and directly filtered out in the first area 321 of the drying box 31 is incinerated; the harmful substances precipitated by the regular addition of reagents by the staff in the above-mentioned filter water box 8 also need to be incinerated. Therefore, the filter water box 8 is connected to the incinerator 61, which is used to transport the harmful residues regularly filtered out by the filter water box 8 to the incinerator 61 for incineration.

[0040] Reference Figure 1 , the incinerator 61 is connected to the heating box 4. Furthermore, the smoke outlet of the incinerator 61 is only connected to the heating box 4, and the high-temperature flue gas is supplied to the inside of the drying box 31 through the heating box 4. In this embodiment, in order to avoid flue gas concentration, two pipes are arranged between the incinerator 61 and the heating box 4 in this embodiment, which respectively correspond to the two connected channels between the heating box 4 and the drying box 31, that is, they respectively correspond to the first area 321 and the second area 322 of the drying box 31. Although the high-temperature flue gas generated by the combustion of harmful substances in the incinerator 61 is harmful to the human body, it contains a large amount of heat energy. Direct discharge will not only pollute the environment, but also waste a lot of heat energy and reduce economic benefits. Therefore, in this embodiment, the high-temperature flue gas is introduced into the drying box 31 through a pipe to utilize the heat energy inside it. In addition to the electric heating pipe 41 and the fan, the incinerator 61 is also one of the heat sources for the drying box 31.

[0041] Reference Figure 1 and Figure 2, the flue gas directly introduced by the incinerator 61 into the heating box 4 and the drying box 31 contains harmful gases generated by the burning of harmful substances, and the harmful gases diffuse in the drying box 31. However, considering that the inside and outside of the drying box 31 are connected, there is a channel opening for conveying sludge on it. The harmful gases diffuse into the room through the channel opening, affecting the health of the staff. Therefore, the opposite side walls of the drying box 31 correspond to the first area 321 and the second area 322 for input and output of the drying belt 33. A safety chamber is formed in the direction away from the drying box 31. The harmful gases inside the drying box 31 diffuse to the outside through the channel opening and must pass through the safety chamber. In order to minimize the gas leakage, in this embodiment, a pipeline connected to the heating box 4 is set at the safety chamber, and a fan is equipped to extract the harmful gases in the safety chamber. Therefore, when the harmful gases leak, they are extracted by the fan when passing through the safety chamber and drawn back to the heating box 4 through the pipeline, so as to minimize the gas leakage.

[0042] Reference Figure 1 and Figure 4 The waste gas bin 7 is arranged on one side of the drying box 31 close to the incinerator 61. The waste gas bin 7 is connected to the heating box 4, and the first area 321 and the second area 322 of the drying box 31 are connected through the heating box 4. The high-temperature flue gas containing harmful substances in the sludge drying process in the drying bin 32 is finally discharged into the waste gas bin 7. A waste gas treatment device is arranged in the waste gas bin 7 to treat the harmful gas in the waste gas bin 7. In this embodiment, the waste gas treatment device mainly includes devices for denitration, deacidification, and ultraviolet sterilization. The waste gas treatment device is a common technology for pollution control, which will not be described in detail in this embodiment.

[0043] Reference Figure 1 and Figure 4 In this embodiment, two connected pipes are arranged between the heating box 4 and the waste gas bin 7, one of which is used for the high-temperature flue gas in the drying box 31 to flow into the waste gas bin 7, and the other pipe is used for the flue gas treated by the waste gas treatment device to flow back into the waste gas bin 7, thereby reducing the distribution content of harmful substances in the waste gas bin 7 and reusing the thermal energy of the high-temperature flue gas in the waste gas bin 7 to improve energy utilization.

[0044] Reference Figure 4 The water filter box 8 is connected to the waste gas bin 7 through a pipe. The filtered water in the water filter box 8 is passed into the waste gas bin 7 and can be used as the source of water in the waste gas bin 7. Specifically, whether it is denitrification or deacidification, water is required to dissolve the corresponding denitrification and deacidification substances. Therefore, in this embodiment, the water filter box 8 is used to reduce the water resource consumption in the waste gas treatment process.

[0045] It should be noted that the embodiments of the present application do not limit the form of connection between the above-mentioned devices. They can be connected through pipelines or conveyor belts, but for harmful gases, they must be closed pipelines.

[0046] The implementation principle of a sludge treatment system for sludge discharge and recovery in an embodiment of the present application is as follows: the pretreatment box 1 is connected to the first area 321 of the drying box 31 and the belt filter press 21 at the same time, and the harmful substances filtered by the pretreatment are discharged into the first area 321 of the drying box 31; the belt filter press 21 is connected to the second area 322 of the drying box 31, and the sludge from which the moisture is initially removed is sent to the second area 322 of the drying box 31; the harmful substance waste residue dried from the first area 321 is transported to the incinerator 61; and the dried sludge transported out of the second area 322 is transported to the packaging machine for packaging and storage.

[0047] The harmful flue gas generated by the incinerator 61 burning harmful substances is discharged into the drying box 31 before being discharged into the waste gas bin 7 for collection. As one of the heat sources of the drying box 31, the high-temperature heat energy in the high-temperature flue gas in the incinerator 61 is used, and then the high-temperature flue gas with harmful substances in the drying box 31 is discharged into the waste gas bin 7 for collection and then purified in the waste gas bin 7. A part of the waste gas purified by the waste gas purification device flows back to the drying box 31, and the concentration of harmful substances in the drying box 31 is reduced while the heat energy of the high-temperature flue gas is used, and the other part is discharged into the atmosphere.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sludge treatment system for sludge discharge and recovery, comprising a pretreatment tank (1), wherein the pretreatment tank (1) is used for preliminary sludge treatment, and is characterized in that: Also includes; A filter press device (2), connected to the pretreatment box (1), used for squeezing water out of the sludge; A drying device (3) is provided with a drying bin (32) for drying sludge inside, the drying bin (32) comprises a first area (321) and a second area (322), and the second area (322) is connected to the filter press device (2); An incineration device (6), connected to the first area (321) in the drying bin (32), for incinerating harmful substances in the sludge; A heating device, connected to the drying bin (32), to provide hot air to the drying bin (32); A waste gas bin (7) connected to the drying bin (32) and used for collecting harmful smoke in the drying bin (32); The packaging device (5) is connected to the second area (322) of the drying bin (32) and is used for packaging the treated sludge.

2. A sludge treatment system for sludge discharge and recovery according to claim 1, characterized in that: The first area (321) and the second area (322) in the drying bin (32) are in communication.

3. A sludge treatment system for sludge discharge and recovery according to claim 1, characterized in that: The smoke outlet of the incinerator (61) is connected to the first area (321) and the second area (322) of the drying bin (32).

4. A sludge treatment system for sludge discharge and recovery according to claim 1, characterized in that: Also includes; A filter water box (8), connected to the filter press device (2), and accommodating wastewater generated during the sludge discharge process of the filter press device (2); The waste gas bin (7) is provided with: An exhaust gas treatment device is connected to the water filter box (8).

5. A sludge treatment system for sludge discharge and recovery according to claim 1, characterized in that: Exhaust pipes are provided at the outlet and the inlet of the drying equipment (3).

6. A sludge treatment system for sludge discharge and recovery according to claim 4, characterized in that: The water filter box (8) is connected to the incinerator (61).

7. A sludge treatment system for sludge discharge and recovery according to claim 1, characterized in that: The gas outlet of the waste gas bin (7) is connected to the drying bin (32).

8. A sludge treatment system for sludge discharge and recovery according to claim 1, characterized in that: The drying bin (32) is provided with: A plurality of drying belts (33) are horizontally arranged in the first area (321) and the second area (322), and are vertically distributed along the inner wall of the drying bin (32). Adjacent drying belts (33) in the first area (321) or the second area (322) are alternately distributed on opposite side walls to form a sludge conveying channel.

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