Sludge treatment system

Abstract

The utility model discloses a sludge treatment system. The sludge treatment system comprises sludge drying equipment, a condensation system, a sludge incineration system and an incineration product treatment system, the sludge drying equipment is provided with a sludge outlet, a wastewater outlet and a steam outlet, the steam outlet is connected with the condensing system, the condensing system is provided with a condensed water outlet, the sludge outlet is connected with the sludge incineration system, and the sludge incineration system is provided with a flue gas outlet and a fly ash outlet; the incineration product treatment system comprises a flue gas deacidification system, the flue gas outlet is connected with the flue gas deacidification system, and at least one of the wastewater outlet and the condensate water outlet is connected with the flue gas deacidification system; and / or the incineration product treatment system comprises a fly ash chelating system, the fly ash outlet is connected with the fly ash chelating system, and at least one of the wastewater outlet and the condensate water outlet is connected with the fly ash chelating system. According to the system, sludge drying wastewater can be recycled, the burden of a wastewater treatment station is relieved, and the use amount of process water for flue gas deacidification treatment or fly ash chelation treatment is reduced.

Description

Technical Field

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

[0002] The sludge generated by municipal sewage treatment (hereinafter referred to as "wet sludge") has a high water content and is usually dried using sludge drying equipment such as disc dryers. In the sludge drying equipment, the heat exchange medium such as high-temperature steam is introduced to exchange heat with the wet sludge, so that the water inside the wet sludge evaporates to produce water vapor, and the macromolecular substances decompose to produce volatile substances. The volatile substances and water vapor are mixed to form high-humidity waste gas, which is sent to the condensation system for condensation to produce condensed wastewater. At the same time, wastewater is also produced inside the sludge drying equipment. The two parts of wastewater are collectively referred to as sludge drying wastewater. Sludge drying wastewater is a highly polluted wastewater and needs to be treated before it can be discharged.

[0003] In the related art, the sludge treatment system directly sends the sludge drying wastewater to the wastewater treatment station for treatment, which fails to utilize the sludge drying wastewater, resulting in a waste of resources and increasing the burden on the wastewater treatment station. In addition, the drying of wet sludge produces dry sludge, which is often sent to a waste incineration plant for co-incineration or to a fluidized bed for separate incineration. The incineration produces flue gas and fly ash. The flue gas can be sent to a flue gas deacidification system for deacidification treatment, and the fly ash can be sent to a fly ash chelation system for chelation treatment. Both the deacidification treatment and the chelation treatment use process water for reaction, and the process water consumption is relatively high.

[0004] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects is still a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a sludge treatment system to achieve the recycling of sludge drying wastewater, which can save resources, reduce the burden on wastewater treatment stations, and reduce the amount of process water used in flue gas deacidification treatment or fly ash chelation treatment.

[0006] In order to solve the above technical problems, the present application provides a sludge treatment system, including sludge drying equipment, a condensation system, a sludge incineration system and an incineration product treatment system; the sludge drying equipment has a sludge outlet, a wastewater outlet and a steam outlet, the steam outlet is connected to the condensation system, the condensation system has a condensed water outlet, the sludge outlet is connected to the sludge incineration system, and the sludge incineration system has a flue gas outlet and a fly ash outlet;

[0007] The incineration product treatment system comprises a flue gas deacidification system, the flue gas outlet is connected to the flue gas deacidification system, and at least one of the waste water outlet and the condensed water outlet is connected to the flue gas deacidification system; and / or,

[0008] The incineration product treatment system includes a fly ash chelating system, the fly ash outlet is connected to the fly ash chelating system, and at least one of the wastewater outlet and the condensed water outlet is connected to the fly ash chelating system.

[0009] Optionally, the sludge treatment system further includes a water storage device;

[0010] The wastewater outlet and the condensed water outlet are both connected to the water storage device, and the wastewater outlet of the water storage device is connected to the incineration product treatment system.

[0011] Optionally, the wastewater outlet of the water storage device is connected to a wastewater treatment station; and / or, when the incineration product treatment system includes the flue gas deacidification system, the wastewater outlet of the flue gas deacidification system is connected to the wastewater treatment station.

[0012] Optionally, the wastewater outlet is connected to a wastewater delivery pipe, and the wastewater delivery pipe is provided with a water pump.

[0013] Optionally, the sludge drying equipment has a drying chamber, which is used to dry the sludge. A water collecting chamber is connected below the drying chamber. The water collecting chamber gradually shrinks into an inverted cone from top to bottom, and the wastewater outlet is formed at the bottom.

[0014] Optionally, the angle between the side wall of the water collecting chamber and the horizontal plane is 20°~30°.

[0015] Optionally, the wastewater outlet is provided with a filtering component.

[0016] Optionally, the condensation system includes a condenser and a first dust collector, the steam outlet is connected to the condenser through the first dust collector, and the condenser has the condensed water outlet.

[0017] Optionally, the sludge incineration system includes a dry sludge bin, a sludge incinerator and a dust removal system which are connected in sequence, the sludge outlet is connected to the dry sludge bin, and the dust removal system has the flue gas outlet and the fly ash outlet.

[0018] Optionally, the flue gas deacidification system includes a flue gas heat exchanger, a deacidification tower and a chimney, the flue gas outlet is connected to the original flue gas inlet of the flue gas heat exchanger, the original flue gas outlet of the flue gas heat exchanger is connected to the flue gas inlet of the deacidification tower, the flue gas outlet of the deacidification tower is connected to the clean smoke gas inlet of the flue gas heat exchanger, and the clean smoke gas outlet of the flue gas heat exchanger is connected to the smoke inlet of the chimney.

[0019] The sludge treatment system provided in the present application is provided with sludge drying equipment, a condensation system, a sludge incineration system and an incineration product treatment system. The sludge drying equipment has a sludge outlet, a wastewater outlet and a steam outlet. The steam outlet is connected to the condensation system. The condensation system has a condensate outlet. The sludge outlet is connected to the sludge incineration system. When the incineration product treatment system includes a flue gas deacidification system, the flue gas outlet of the sludge incineration system is connected to the flue gas deacidification system, and at least one of the wastewater outlet and the condensate outlet is connected to the flue gas deacidification system. When the incineration product treatment system includes a fly ash chelating system, the fly ash outlet of the sludge incineration system is connected to the fly ash chelating system, and at least one of the wastewater outlet and the condensate outlet is connected to the fly ash chelating system. When in use, the sludge drying wastewater can be sent to the flue gas deacidification system to cool and deacidify the flue gas produced by the incineration of dry sludge, or the sludge drying wastewater can be sent to the fly ash chelation system to chelate the fly ash produced by the incineration of sludge, thereby realizing the recycling of the sludge drying wastewater, saving resources, reducing the burden on the wastewater treatment station, and reducing the amount of process water used in the flue gas deacidification treatment or fly ash chelation treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the sludge treatment system of the embodiment provided in this application;

[0021] Figure 2 This is a schematic diagram of the structure of the sludge drying equipment in the sludge treatment system of the embodiment provided in this application.

[0022] The reference numerals in the above drawings are described as follows:

[0023] 1-sludge drying equipment, 1a-sludge outlet, 1b-wastewater outlet, 1c-steam outlet, 11-drying chamber, 12-water collection chamber;

[0024] 2-condensation system, 2a-condensation water outlet, 21-condenser, 22-first dust collector;

[0025] 3-sludge incineration system, 3a-flue gas outlet, 3b-fly ash outlet, 31-dry sludge bin, 32-sludge incinerator, 33-electrostatic precipitator, 34-bag dust collector;

[0026] 4- flue gas deacidification system, 41- flue gas heat exchanger, 42- deacidification tower, 43- chimney;

[0027] 5-Fly ash chelation system;

[0028] 6- Water storage equipment;

[0029] 7- Wastewater treatment station;

[0030] 81-wastewater delivery pipe, 82-water pump;

[0031] 9-Wet sludge silo. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] It should be noted that the "wet" in the wet sludge and the "dry" in the dry sludge described in this application are relative. The water content of wet sludge is higher than that of dry sludge. Wet sludge needs to be dehydrated to form dry sludge.

[0034] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the sludge treatment system of the embodiment provided in this application.

[0036] In the embodiment provided in the present application, the sludge treatment system includes a sludge drying device 1, a condensation system 2, a sludge incineration system 3 and an incineration product treatment system; the sludge drying device 1 has a sludge outlet 1a, a wastewater outlet 1b and a steam outlet 1c, the steam outlet 1c is connected to the condensation system 2, the condensation system 2 has a condensed water outlet 2a, the sludge outlet 1a is connected to the sludge incineration system 3, and the sludge incineration system 3 has a flue gas outlet 3a and a fly ash outlet 3b. Figure 1 It is understood that the incineration product treatment system includes a flue gas deacidification system 4, the flue gas outlet 3a is connected to the flue gas deacidification system 4, and at least one of the wastewater outlet 1b and the condensed water outlet 2a is connected to the flue gas deacidification system 4; the incineration product treatment system includes a fly ash chelating system 5, the fly ash outlet 3b is connected to the fly ash chelating system 5, and at least one of the wastewater outlet 1b and the condensed water outlet 2a is connected to the fly ash chelating system 5.

[0037] It can be understood that the wet sludge is dried by the sludge drying equipment 1 to produce dry sludge, which is sent to the sludge incineration system 3 for incineration. The incineration of dry sludge produces flue gas and fly ash. The flue gas contains more Sox, which can be sent to the flue gas deacidification system 4 to react with the alkaline slurry as expected and undergo deacidification treatment to make the flue gas meet the emission standards; the fly ash has a high content of heavy metals and does not meet the leaching limit requirements. It can be sent to the fly ash chelation system 5 to mix with water and chelating agent to stabilize the heavy metals in the form of fly ash chelates, and then the fly ash chelates are landfilled. During the wet sludge drying process, the moisture inside the wet sludge will evaporate to produce steam, and the volatile substances produced by the decomposition of mixed macromolecular substances will form high-humidity waste gas. The waste gas is sent to the condensation system 2 for condensation to produce condensed water. At the same time, liquid wastewater will also be produced inside the sludge drying equipment 1. This part of wastewater and the condensed water produced by the condensation system 2 are collectively referred to as sludge drying wastewater.

[0038] In the embodiment of the present application, at least one of the wastewater outlet 1b and the condensed water outlet 2a is connected to the flue gas deacidification system 4 and the fly ash chelating system 5, and at least a portion of the sludge drying wastewater can be sent to the flue gas deacidification system 4 to cool and deacidify the flue gas produced by the incineration of dry sludge. At least a portion of the sludge drying wastewater can be sent to the fly ash chelating system 5 to chelate the fly ash produced by the incineration of dry sludge, thereby realizing the recycling of at least a portion of the sludge drying wastewater and saving resources. The sludge drying wastewater that is not recycled can be directly sent to the wastewater treatment station for treatment, which can reduce the burden on the wastewater treatment station.

[0039] Moreover, compared with the prior art in which the flue gas deacidification system 4 uses process water for cooling and slurrying, the sludge treatment system provided in the embodiment of the present application can use sludge drying wastewater to cool the flue gas. Since the sludge drying wastewater is alkaline, the sludge drying wastewater can also be used to prepare alkaline slurry for deacidification, thereby greatly reducing the amount of process water used and reducing the cost of flue gas deacidification. At the same time, the sludge drying wastewater used for cooling and the sludge drying wastewater in the alkaline slurry can also improve the flue gas deacidification efficiency.

[0040] Compared with the fly ash chelating system 5 in the prior art that uses process water to chelate fly ash, the sludge treatment system provided in the embodiment of the present application can use sludge drying wastewater to chelate fly ash, which can reduce the amount of process water and reduce the cost of fly ash chelation. At the same time, sludge drying wastewater is generally alkaline, and when used together with the chelating agent, it can stabilize the heavy metals in the fly ash in the form of chelates, improve the fly ash chelation efficiency, and improve the stability of the fly ash chelate, reduce the leaching rate of heavy metals in the fly ash, and reduce the pollution risks of landfills.

[0041] As can be seen from the above, the sludge treatment system provided in the embodiment of the present application can realize the coordinated treatment of wastewater during the sludge drying process by connecting at least one of the wastewater outlet 1b and the condensed water outlet 2a to the flue gas deacidification system 4 and the fly ash chelating system 5, thereby improving the recycling rate of sludge drying wastewater, and also improving the treatment efficiency of multiple links of the entire sludge treatment system, and reducing the treatment cost of the entire sludge treatment system.

[0042] It is worth noting that the above-mentioned incineration product treatment system is used to treat the dry sludge incineration products - flue gas and fly ash, which may include a flue gas deacidification system 4, and may also include a fly ash chelating system 5, or may include a flue gas deacidification system 4 and a fly ash chelating system 5 as shown in the above embodiment. It is specifically configured according to the processing requirements and is not limited to the embodiments of the present application.

[0043] In actual settings, for the flue gas deacidification system 4, the wastewater outlet 1b can be connected to the flue gas deacidification system 4 to use the wastewater inside the sludge drying equipment 1 for flue gas deacidification, or the condensate outlet 2a can be connected to the flue gas deacidification system 4 to use the wastewater after condensation of the waste gas produced by sludge drying for flue gas deacidification, or the wastewater outlet 1b and the condensate outlet 2a can be connected to the flue gas deacidification system 4 to use the wastewater inside the sludge drying equipment 1 and the wastewater produced by the condensation of the waste gas for flue gas deacidification, and there is no specific limitation. For the fly ash chelating system 5, the connection between the wastewater outlet 1b and the condensate outlet 2a and the fly ash chelating system 5 is similar to that of the flue gas deacidification system 4, and will not be repeated here. In addition, the wastewater outlet 1b and the condensed water outlet 2a can be directly connected to the incineration product treatment system to send part of the sludge drying wastewater directly to the subsequent flue gas deacidification and fly ash chelation processes. Of course, an intermediate buffer device can also be set to cache the sludge drying wastewater, and the sludge drying wastewater can be distributed to the flue gas deacidification and fly ash chelation processes through the intermediate buffer device. There is no specific limitation.

[0044] As an alternative, please refer to Figure 1 The sludge treatment system further includes a water storage device 6; the wastewater outlet 1b and the condensed water outlet 2a are both connected to the water storage device 6, and the wastewater outlet of the water storage device 6 is connected to the incineration product treatment system. The structure of the water storage device 6 is not limited, for example, it can be a water storage tank, a water storage tank, or a water storage tank.

[0045] In this way, the wastewater inside the sludge drying equipment 1 and the wastewater generated by the condensation system 2 can be first stored in the water storage device 6 to cache the sludge drying wastewater, making the wastewater supply of subsequent processes more controllable and more stable, thereby improving the processing efficiency of subsequent processes.

[0046] In the embodiment of the present application, the wastewater outlet of the water storage device 6 can also be connected to the wastewater treatment station 7, and the wastewater outlet of the flue gas deacidification system 4 can also be connected to the wastewater treatment station 7. In this way, on the basis that the sludge drying wastewater inside the water storage device 6 meets the requirements of the flue gas deacidification and fly ash chelation processes, part of the sludge drying wastewater can be sent to the wastewater treatment station 7 for treatment, and the sludge drying wastewater entering the flue gas deacidification system 4 can also be sent to the wastewater treatment station 7 for treatment after playing the role of cooling and flue gas deacidification. Since only part of the sludge drying wastewater is sent to the wastewater treatment station 7, the processing burden of the wastewater treatment station 7 is reduced compared with the prior art.

[0047] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the sludge drying equipment in the sludge treatment system of the embodiment provided in this application.

[0048] In actual configuration, the structural form of the sludge drying device 1 is not limited. It can pass heat exchange media such as high-temperature steam and heat transfer oil to exchange heat with the wet sludge, so that the moisture contained in the wet sludge can be removed in the form of steam.

[0049] As an alternative, please refer to Figure 2 The sludge drying device 1 is a disc dryer. When in use, the wet sludge can be sent from the wet sludge bin 9 to the disc dryer for drying, which can improve the uniformity of the wet sludge drying and improve the drying efficiency.

[0050] In the embodiment provided in the present application, the wastewater outlet 1b is connected to a wastewater delivery pipe 81, and the wastewater delivery pipe 81 is provided with a pump 82. The outlet of the pump 82 can be connected to the water storage device 6 to pump out the wastewater and send it to the water storage device 6 for storage.

[0051] In the related art, the disc dryer is usually provided with a drain valve at the wastewater outlet. When the drain valve is opened to drain water, it is easy to cause a large amount of heat inside the disc dryer to be lost, so the drain valve cannot be opened frequently, which results in that the wastewater generated inside the disc dryer cannot be discharged in time, making the internal humidity high and the temperature low, which will reduce the drying efficiency of wet sludge. The above embodiment of the present application sets a wastewater delivery pipe 81 at the wastewater outlet 1b, and sets a pump 82 in the wastewater delivery pipe 81. When the pump 82 is turned on, the heat loss inside the disc dryer is small, so that during the wet sludge drying process, the wastewater inside the disc dryer can be pumped out in time, thereby improving the drying efficiency of wet sludge.

[0052] Moreover, in the related art, the disc dryer usually needs to heat the wastewater generated inside to promote its evaporation into gas and send it to the condensation equipment for condensation and discharge, which leads to high energy consumption. The sludge treatment system provided in the embodiment of the present application can use the water pump 82 to extract the wastewater inside the disc dryer in time, so that there is no need to add additional heat to discharge the wastewater by the evaporation-condensation path, which can reduce the energy consumption of the disc dryer and save resources.

[0053] In the examples of this application, please refer to Figure 2 The sludge drying equipment 1 has a drying chamber 11, which is used to dry the sludge. The drying chamber 11 is connected to a water collecting chamber 12 below. The water collecting chamber 12 gradually shrinks from top to bottom into an inverted cone, and forms a wastewater outlet 1b at the bottom. In this way, the wastewater generated by the drying process inside the drying chamber 11 is easily concentrated in the water collecting chamber 12, which is conducive to the pumping pump 82 to pump out the wastewater in time, and can also be pumped out as much as possible, thereby reducing the humidity inside the disc dryer, reducing the impact of the internal wastewater on the internal temperature of the disc dryer, and improving the drying efficiency.

[0054] During the specific setting, the inclination angle of the side wall of the water collecting chamber 12, that is, the angle between it and the horizontal plane is not limited. For example, it can be 20°~30°, which can achieve a better effect of wastewater concentration and reduce the impact of the downward tilt of the water collecting chamber 12 on the internal thermal field and steam flow of the disc dryer, thereby further improving the drying efficiency.

[0055] In the embodiment provided in the present application, the wastewater outlet 1b is provided with a filtering component, which can filter the wastewater flowing out through the wastewater outlet 1b, so that the discharged wastewater is not easily mixed with sludge and clogs the pipeline.

[0056] In specific configuration, the structure of the filter component is not limited, for example, it can be filter cotton or a filter net.

[0057] The condensation system 2 is used to condense the waste gas generated by the drying of wet sludge, and its structure is not limited.

[0058] As an optional solution, the condensation system 2 includes a condenser 21 and a first dust collector 22. The steam outlet 1c is connected to the condenser 21 through the first dust collector 22. The condenser 21 has a condensate outlet 2a. In this way, the waste gas generated by the drying of the wet sludge can be dedusted by the first dust collector 22, so that the waste gas is not easily mixed with sludge and blocks the condenser 21. The condensate outlet 2a of the condenser 21 can be as follows: Figure 1 As shown, it is connected to the above-mentioned water storage device 6 to send the condensed waste water into the water storage device 6 for storage.

[0059] The sludge incineration system 3 is used to incinerate the dry sludge produced by drying the wet sludge, and its specific structure is not limited.

[0060] As an alternative, please refer to Figure 1 The sludge incineration system 3 includes a dry sludge bin 31, a sludge incinerator 32 and a dust removal system which are connected in sequence. The sludge outlet 1a is connected to the dry sludge bin 31, and the dust removal system has a flue gas outlet 3a and a fly ash outlet 3b.

[0061] In this way, the dry sludge produced by the drying of wet sludge can be stored in the dry sludge bin 31, and then sent from the dry sludge bin 31 to the sludge incinerator 32 for incineration. The incineration will produce tail gas and slag, and the tail gas can enter the dust removal system for dust removal. The dust removal system can improve the separation effect of flue gas and fly ash in the tail gas, which is beneficial to the subsequent deacidification treatment of the flue gas and the chelation treatment of the fly ash.

[0062] When setting up the dust removal system, the structure is not limited. For example, please refer to Figure 1 The dust removal system may specifically include an electrostatic precipitator 33 and a bag filter 34, and the ash outlet of the electrostatic precipitator 33 and the ash outlet of the bag filter 34 may both be fly ash outlets 3b. In this way, the electrostatic precipitator 33 may be used to treat the tail gas from the dry sludge incineration to preliminarily separate the flue gas and the fly ash; the preliminarily separated flue gas may be sent to the bag filter 34 for treatment, so that the fly ash mixed in the flue gas and the flue gas are further separated, and the obtained flue gas is transported to the flue gas deacidification system 4 for treatment, and the fly ash is sent from the ash outlet of the electrostatic precipitator 33 and the ash outlet of the bag filter 34 to the fly ash chelating system 5 for treatment. Among them, before the flue gas enters the bag filter 34 from the electrostatic precipitator 33, activated carbon may be used to adsorb heavy metals and dioxins in the flue gas, and dry powdered slaked lime may be used to preliminarily deacidify the flue gas.

[0063] The structure of the flue gas deacidification system 4 in the incineration product treatment system is not limited. For example, the flue gas deacidification system 4 may include a deacidification tower 42, and the deacidification tower 42 is used to perform deacidification treatment on the flue gas.

[0064] In the examples of this application, please refer to Figure 1 The flue gas deacidification system 4 may also include a flue gas heat exchanger 41 and a chimney 43. The flue gas outlet 3a of the bag filter 34 may be connected to the original flue gas inlet of the flue gas heat exchanger 41, the original flue gas outlet of the flue gas heat exchanger 41 may be connected to the flue gas inlet of the deacidification tower 42, the flue gas outlet of the deacidification tower 42 may be connected to the clean flue gas inlet of the flue gas heat exchanger 41, and the clean flue gas outlet of the flue gas heat exchanger 41 may be connected to the flue gas inlet of the chimney 43. In this way, the flue gas transported by the bag filter 34 is the original flue gas, and the flue gas output by the deacidification tower 42 is relatively clean flue gas. The original flue gas can be used to heat the clean flue gas after deacidification in the flue gas heat exchanger 41, so that the temperature of the clean flue gas is increased to above the dew point, which can reduce the corrosion of the clean flue gas to the subsequent chimney 43. At the same time, the temperature of the original flue gas can also be reduced, reducing the corrosion of the deacidification tower 42 by the original flue gas, thereby extending the service life of the deacidification tower 42 and the chimney 43.

[0065] The following is a description of the working process of the sludge treatment system provided in the embodiment of the present application with reference to the accompanying drawings:

[0066] Wet sludge drying: a heat exchange medium is introduced into the sludge drying device 1, and at the same time, the wet sludge is sent to the sludge drying device 1, and the wet sludge is dried by the heat exchange medium to produce dry sludge, wastewater and waste gas, and the waste gas is sent to the condensation system 2 for condensation to produce condensed water;

[0067] Dry sludge incineration: The dry sludge is sent to the sludge incineration system 3 for incineration, generating flue gas and fly ash;

[0068] Flue gas deacidification: the flue gas is sent to the flue gas deacidification system 4, and at the same time, at least one of the waste water and the condensed water is sent to the flue gas deacidification system 4 to deacidify the flue gas;

[0069] Fly ash chelation: The fly ash is sent to the fly ash chelation system 5. At the same time, at least one of the wastewater and the condensed water is sent to the fly ash chelation system 5, and a chelating agent is added to the fly ash chelation system 5 to perform chelation treatment on the fly ash.

[0070] In the embodiment of the present application, the wastewater outlet 1b is connected to the water storage device 6 through a water pump 82. The wastewater can be pumped out of the sludge drying equipment 1 and sent to the water storage device 6 every 20-60 minutes using the water pump 82, thereby realizing the timed extraction of wastewater in the sludge drying equipment 1, reducing the impact of internal wastewater on the sludge drying process, and improving the sludge drying efficiency.

[0071] In the embodiment provided in the present application, the moisture content of the wet sludge to be treated is 80%. After being dried by the sludge drying equipment 1, dry sludge with a moisture content of 40% and sludge drying wastewater can be obtained. The dry sludge is incinerated and dust-removed in the sludge incineration system 3 to generate flue gas and fly ash. The flue gas is sent to the flue gas deacidification system 4 for deacidification treatment, and the fly ash is sent to the fly ash chelation system 5 for chelation treatment.

[0072] In the embodiment of the present application, the sludge drying wastewater is sent to the flue gas deacidification system 4 as cooling water to deacidify the flue gas for one week. In a pair of ratios, the sludge drying wastewater is not used, but the traditional process water is used as cooling water to deacidify the flue gas in the flue gas deacidification system 4 for one week. By comparison, it is found that the flue gas deacidification efficiency using the sludge drying wastewater in the embodiment of the present application is higher.

[0073] In the embodiment of the present application, 300 kg of fly ash is sent to the fly ash chelation system 5, and at the same time, 9 kg of chelating agent and 75 kg of sludge drying wastewater are added to perform chelation treatment on the fly ash. In another comparative example, 300 kg of fly ash is sent to the fly ash chelation system 5, and at the same time, 9 kg of chelating agent and 75 kg of process water are added to perform chelation treatment on the fly ash. By comparison, it is found that the fly ash chelate obtained by using sludge drying wastewater in the embodiment of the present application has higher stability and higher chelation efficiency.

[0074] It can be seen that the sludge treatment system provided in the embodiment of the present application can send the sludge drying wastewater output from the wastewater outlet 1b and the condensed water outlet 2a into the flue gas deacidification system 4 and the fly ash chelating system 5, which can improve the deacidification treatment efficiency of the flue gas produced by the incineration of dry sludge and the chelating treatment efficiency of the fly ash produced, and realize the efficient recycling of the sludge drying wastewater.

[0075] The principles and implementation methods of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the device and its core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A sludge treatment system, characterized in that: The invention comprises a sludge drying device (1), a condensation system (2), a sludge incineration system (3) and an incineration product treatment system; the sludge drying device (1) has a sludge outlet (1a), a wastewater outlet (1b) and a steam outlet (1c); the steam outlet (1c) is connected to the condensation system (2); the condensation system (2) has a condensate outlet (2a); the sludge outlet (1a) is connected to the sludge incineration system (3); and the sludge incineration system (3) has a smoke outlet (3a) and a fly ash outlet (3b); The incineration product treatment system comprises a flue gas deacidification system (4), the flue gas outlet (3a) is connected to the flue gas deacidification system (4), and at least one of the waste water outlet (1b) and the condensed water outlet (2a) is connected to the flue gas deacidification system (4); and / or, The incineration product treatment system comprises a fly ash chelating system (5), the fly ash outlet (3b) is connected to the fly ash chelating system (5), and at least one of the wastewater outlet (1b) and the condensed water outlet (2a) is connected to the fly ash chelating system (5).

2. The sludge treatment system according to claim 1, characterized in that: The sludge treatment system further comprises a water storage device (6); The wastewater outlet (1b) and the condensed water outlet (2a) are both connected to the water storage device (6), and the wastewater outlet of the water storage device (6) is connected to the incineration product treatment system.

3. The sludge treatment system according to claim 2, characterized in that: The wastewater outlet of the water storage device (6) is connected to a wastewater treatment station (7); and / or, when the incineration product treatment system includes the flue gas deacidification system (4), the wastewater outlet of the flue gas deacidification system (4) is connected to the wastewater treatment station (7).

4. The sludge treatment system according to any one of claims 1 to 3, characterized in that: The wastewater outlet (1b) is connected to a wastewater delivery pipe (81), and the wastewater delivery pipe (81) is provided with a water pump (82).

5. The sludge treatment system according to claim 4, characterized in that: The sludge drying equipment (1) comprises a drying chamber (11), wherein the drying chamber (11) is used for drying sludge, and a water collecting chamber (12) is connected below the drying chamber (11). The water collecting chamber (12) gradually tapers from top to bottom into an inverted cone shape, and forms the wastewater outlet (1b) at the bottom.

6. The sludge treatment system according to claim 5, characterized in that: The angle between the side wall of the water collecting chamber (12) and the horizontal plane is 20° to 30°.

7. The sludge treatment system according to any one of claims 1 to 3, characterized in that: The wastewater outlet (1b) is provided with a filtering component.

8. The sludge treatment system according to any one of claims 1 to 3, characterized in that: The condensation system (2) comprises a condenser (21) and a first dust collector (22); the steam outlet (1c) is connected to the condenser (21) via the first dust collector (22); and the condenser (21) has the condensed water outlet (2a).

9. The sludge treatment system according to any one of claims 1 to 3, characterized in that: The sludge incineration system (3) comprises a dry sludge bin (31), a sludge incinerator (32) and a dust removal system which are connected in sequence; the sludge outlet (1a) is connected to the dry sludge bin (31); and the dust removal system has the flue gas outlet (3a) and the fly ash outlet (3b).

10. The sludge treatment system according to any one of claims 1 to 3, characterized in that: The flue gas deacidification system (4) comprises a flue gas heat exchanger (41), a deacidification tower (42) and a chimney (43); the flue gas outlet (3a) is connected to the original flue gas inlet of the flue gas heat exchanger (41); the original flue gas outlet of the flue gas heat exchanger (41) is connected to the flue gas inlet of the deacidification tower (42); the flue gas outlet of the deacidification tower (42) is connected to the clean flue gas inlet of the flue gas heat exchanger (41); and the clean flue gas outlet of the flue gas heat exchanger (41) is connected to the flue gas inlet of the chimney (43).

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