An in-situ dewatering and desulfurization system and method for treating printing and dyeing sludge

Abstract

The application discloses a kind of in-situ dewatering and desulfurization systems for treating printing and dyeing sludge, and relates to the technical field of sludge treatment.The system includes a sludge mixing bin, which is provided with a first feeding port for adding sludge, a second feeding port for adding quicklime, and a discharge port for discharging mixed sludge; a flat plate for laying the mixed sludge discharged from the discharge port, with the mixed sludge in a plate shape on the flat plate; a wood chip laying mechanism for laying wood chips on top of the plate-shaped mixed sludge; an incinerator for incinerating the mixed sludge with wood chips laid on top; a rack rod inside the incinerator for placing the flat plate, with a flue on the incinerator for discharging flue gas; and a desulfurization tower connected to the flue for desulfurizing the flue gas.The application can achieve sufficient dewatering and desulfurization of printing and dyeing sludge, and avoid the damage to the environment caused by sulfur dioxide carried by flue gas generated during incineration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment, and in particular to an in-situ dewatering and desulfurization system and method for treating printing and dyeing sludge. BACKGROUND

[0002] Sludge refers to a mixture of organic and inorganic substances containing solid suspended matter, sediment and microorganisms and other impurities generated in the process of wastewater treatment, pollution control and waste treatment, and has a wide source and complex composition. The sludge may contain a large amount of organic matter, nitrogen, phosphorus, sulfur, chlorine and heavy metals, and if not properly treated, it will pollute the environment.

[0003] Sludge incineration is a high-temperature incineration treatment technology, which organizes the combustion process to completely burn the organic and combustible components in the sludge. Compared with landfill and composting, the sludge incineration has a short reaction time and a small land occupation. During the incineration process, all bacteria and pathogens are completely killed, and toxic and harmful organic residues are thermally oxidized and decomposed. In addition, energy can be recovered for power generation and heating.

[0004] However, the sludge generally contains sulfur, and therefore the sulfur dioxide generated during the incineration process will be discharged into the atmosphere with the flue gas, causing pollution to the environment. In addition, the existing sludge incineration process also has the problem of insufficient incineration.

[0005] Therefore, how to develop a sludge treatment process capable of dewatering and desulfurizing is one of the difficult problems to be solved. SUMMARY

[0006] In order to solve at least one of the technical problems mentioned in the background art, the purpose of the present application is to provide an in-situ dewatering and desulfurization system and method for treating printing and dyeing sludge, which can realize sufficient dewatering and desulfurization of the printing and dyeing sludge and avoid the damage to the environment caused by the sulfur dioxide carried by the flue gas generated during incineration.

[0007] In a first aspect, the present application provides an in-situ dewatering and desulfurization system for treating printing and dyeing sludge, comprising:

[0008] a sludge stirring bin, a first feeding port for adding sludge, a second feeding port for adding quicklime, and a discharge port for discharging mixed sludge are arranged on the sludge stirring bin;

[0009] a flat plate for laying the mixed sludge discharged from the discharge port, the mixed sludge being in a plate shape on the flat plate;

[0010] a wood chip laying mechanism for laying wood chips on the top of the mixed sludge in a plate shape;

[0011] The incinerator is used for incinerating mixed sludge laid with wood chips; the incinerator is provided with a rack rod for placing the flat plate, and a flue for discharging flue gas is arranged on the incinerator;

[0012] The desulfurization tower is connected with the flue to desulfurize the flue gas.

[0013] In some embodiments of the first aspect of the present application, the sludge stirring bin is provided with a stirrer.

[0014] In some embodiments of the first aspect of the present application, the first end of the flue is arranged at the bottom of the incinerator, and a fan for sucking air into the incinerator is arranged in the flue to make the air flow in the incinerator flow downward.

[0015] In some embodiments of the first aspect of the present application, the top of the incinerator is provided with a plurality of air inlet holes.

[0016] In some embodiments of the first aspect of the present application, the incinerator is provided with an igniter above the rack rod for igniting the wood chips on the top of the mixed sludge.

[0017] In some embodiments of the first aspect of the present application, the wood chip laying mechanism comprises a plurality of nozzles for spraying wood chips.

[0018] In some embodiments of the first aspect of the present application, the sludge stirring bin is further provided with a third feeding port for adding carbon powder.

[0019] The second aspect of the present application provides an in-situ dewatering and desulfurization method for treating printing and dyeing sludge, comprising the following steps:

[0020] S1, adding sludge and lime, and stirring uniformly after mixing;

[0021] S2, laying the mixed sludge on a flat plate to make the mixed sludge into a plate shape;

[0022] S3, laying wood chips on the plate-shaped mixed sludge;

[0023] S4, incinerating the mixed sludge laid with wood chips and discharging flue gas;

[0024] S5, desulfurizing the flue gas.

[0025] In some embodiments of the second aspect of the present application, carbon powder is also added synchronously in step S1.

[0026] In some embodiments of the second aspect of the present application, in step S4, air is sucked from the bottom while incinerating to form an air flow from top to bottom around the mixed sludge.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1、The present application adds quicklime in the stirring process, which can realize the dewatering of sludge and remove part of sulfur; combined with the desulfurization tower, the two-stage desulfurization in the printing and dyeing sludge treatment process is realized, and the desulfurization effect is improved.

[0029] 2、In the incineration process, the gas flow is downward, so that the flame of the sludge top incineration extends downward, which makes the incineration of sludge more sufficient, and ensures the treatment of dewatering and pathogenic microorganisms in the sludge. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a system structure schematic diagram of the present application.

[0031] In the figure:

[0032] 1, sludge stirring bin; 11, first feeding port; 12, second feeding port; 13, discharge port; 14, stirrer;

[0033] 2, flat plate; 21, mixed sludge; 22, wood chips;

[0034] 3, wood chip laying mechanism;

[0035] 4, incinerator; 41, frame rod; 42, igniter; 43, air inlet hole;

[0036] 5, flue; 51, fan;

[0037] 6, desulfurization tower. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0039] Embodiment one:

[0040] The embodiment provides an in-situ dewatering and desulfurization system for treating printing and dyeing sludge, mainly including a sludge stirring bin 1, a flat plate 2, a wood chip laying mechanism 3, an incinerator 4, a flue 5 and a desulfurization tower 6.

[0041] Each component will be introduced one by one as follows:

[0042] The sludge stirring bin 1 is used for mixing and stirring sludge. Specifically, the sludge stirring bin 1 is provided with a first feeding port 11 for adding sludge, a second feeding port 12 for adding quicklime, and a discharge port 13 for discharging mixed sludge;

[0043] In order to mix more evenly, the sludge stirring bin 1 is provided with a stirrer 14. After the sludge and quicklime are mixed in the sludge stirring bin 1, the quicklime removes a large amount of water in the sludge and reacts with the internal sulfur substances.

[0044] The flat plate 2 is used for laying the mixed sludge 21 discharged from the discharge port 13, and the mixed sludge 21 is generally plate-shaped on the flat plate 2. The flat plate 2 can be manually moved, or a corresponding moving mechanism can be provided to achieve, such as a conveyor belt.

[0045] The wood chip laying mechanism 3 is used for laying wood chips 22 on the top of the plate-shaped mixed sludge 21. The thickness of the wood chips 22 can be set according to specific conditions, and is generally 5% to 10% of the thickness of the mixed sludge 21. The wood chip laying mechanism 3 specifically includes a plurality of nozzles for spraying wood chips.

[0046] The incinerator 4 is used for incinerating the mixed sludge 21 on which the wood chips 22 are laid. The incinerator 4 is provided with a rack rod 41 for placing the flat plate 2, and is provided with a flue 5 for discharging flue gas;

[0047] In order to ignite the wood chips 22, the igniter 42 for igniting the wood chips 22 on the top of the mixed sludge 21 is arranged above the rack rod 41 in the incinerator 4.

[0048] It is worth mentioning that, since the wood chips 22 are located on the top of the mixed sludge 21, due to the characteristic of upward extension of the flame, it will cause the condition that the internal mixed sludge is not fully incinerated. Therefore, the first end of the flue 5 is arranged at the bottom of the incinerator 4, and the flue 5 is provided with a fan 51 for drawing air into the incinerator 4, so that the air flow in the incinerator 4 flows downward, so that the flame generated by the wood chips 22 extends downward, forming sufficient combustion of the mixed sludge 21.

[0049] At the same time, in order to ensure the smoothness of the air flow, the top of the incinerator 4 is provided with a plurality of air inlet holes 43.

[0050] Since the water content in the mixed sludge 21 is high, in order to ensure that the flame is not easily extinguished, the scheme also adds carbon powder to the mixed sludge 21 to enhance the incineration effect. Specifically, the sludge stirring bin 1 is also provided with a third feeding port (not shown in the figure) for adding carbon powder, and it is worth mentioning that the third feeding port can share one with the second feeding port.

[0051] The desulfurization tower 6 is connected with the flue 5 to desulfurize the flue gas. The desulfurization tower adopts a limestone-gypsum wet desulfurization method to realize two-stage desulfurization in the printing and dyeing sludge treatment process, and avoid the damage to the environment caused by the flue gas carrying sulfur dioxide generated by incineration.

[0052] Example two:

[0053] The embodiment provides an in-situ dewatering and desulfurization method for treating printing and dyeing sludge, and comprises the following steps.

[0054] S1, adding sludge and quicklime, and stirring after mixing; in order to enhance the incineration effect in the later period, carbon powder can also be added synchronously in this step.

[0055] S2, the mixed sludge is laid on a flat plate, so that the mixed sludge is in a plate shape.

[0056] S3, wood chips are laid on the mixed sludge in a plate shape; the thickness of the wood chips can be set according to specific conditions, and is generally 5% to 10% of the thickness of the mixed sludge 21, which is used as the main medium for incineration in the later period.

[0057] S4, the mixed sludge on which the wood chips are laid is incinerated, and flue gas is discharged; while incinerating, air is drawn from the bottom to form an air flow from top to bottom around the mixed sludge. Specifically, in order to achieve this incineration effect, the incineration in this step adopts the incinerator and the flue setting as described in embodiment one. That is:

[0058] The incinerator 4 is used for incinerating the mixed sludge 21 on which the wood chips 22 are laid. The incinerator 4 is provided with a rack rod 41 for placing the flat plate 2, and the incinerator 4 is provided with a flue 5 for discharging flue gas.

[0059] In order to ignite the wood chips 22, the incinerator 4 is provided with an igniter 42 above the rack rod 41 for igniting the wood chips 22 on the top of the mixed sludge 21.

[0060] It is worth mentioning that, since the wood chips 22 are located on the top of the mixed sludge 21, due to the characteristics of the upward extension of the flame, the internal incineration of the mixed sludge will not be sufficient. Therefore, the first end of the flue 5 is arranged at the bottom of the incinerator 4, and the flue 5 is provided with a fan 51 for drawing air into the incinerator 4, so that the air flow in the incinerator 4 flows downward, so that the flame generated by the wood chips 22 extends downward, forming sufficient combustion of the mixed sludge 21.

[0061] At the same time, in order to ensure the smoothness of the air flow, the top of the incinerator 4 is provided with a plurality of air inlet holes 43.

[0062] S5, the flue gas is desulfurized, and specifically adopts limestone-gypsum wet desulfurization.

[0063] It is apparent for a person skilled in the art that the present application is not limited to the details of the above described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than the above description, and all changes coming within the meaning and equivalency range of the claims are intended to be embraced therein.

Claims

1. An in-situ dewatering and desulfurization system for treating dyeing and printing sludge, characterized in that, include: The sludge mixing chamber is provided with a first feeding port for adding sludge, a second feeding port for adding quicklime, and a discharge port for discharging mixed sludge. A flat plate for spreading the mixed sludge discharged from the outlet, the mixed sludge being plate-shaped on the flat plate; A sawdust laying mechanism for laying sawdust on top of slabs of mixed sludge; An incinerator is used to incinerate mixed sludge with wood chips laid on it; the incinerator is equipped with a support frame for placing the flat plate, and a flue for discharging flue gas is provided on the incinerator. A desulfurization tower, connected to a flue gas duct, is used to desulfurize the flue gas; The first end of the flue is located at the bottom of the incinerator, and a fan is installed inside the flue to draw air into the incinerator so that the airflow inside the incinerator flows downward. The sludge mixing chamber is also equipped with a third feeding port for adding charcoal powder; The thickness of the wood chips is 5% to 10% of the thickness of the mixed sludge; An igniter for igniting the sawdust on top of the mixed sludge is installed above the frame in the incinerator. The sawdust spreading mechanism includes several nozzles for spraying sawdust.

2. The in-situ dewatering and desulfurization system for treating dyeing and printing sludge according to claim 1, characterized in that, The sludge mixing chamber is equipped with a mixer.

3. The in-situ dewatering and desulfurization system for treating dyeing and printing sludge according to claim 1, characterized in that, The incinerator is equipped with several air inlets on its top.

4. A method for in-situ dewatering and desulfurization of dyeing and printing sludge, characterized in that, Includes the following steps: S1. Add sludge and quicklime, mix and stir evenly; S2. Spread the mixed sludge evenly on a flat plate so that the mixed sludge is in plate shape; S3. Lay sawdust on the plate-shaped mixed sludge; S4. Burn the mixed sludge covered with sawdust and release flue gas; S5. Desulfurize the flue gas; In step S1, charcoal powder is also added simultaneously; In step S4, air is drawn from the bottom during incineration to create a downward airflow around the mixed sludge. The thickness of the wood chips is 5% to 10% of the thickness of the mixed sludge.

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