Sludge drying and incineration energy-saving system

Abstract

The utility model provides a sludge drying and blending combustion energy-saving system, which relates to the technical field of sludge drying treatment. The sludge drying and blending combustion energy-saving system includes: a storage device, including: a pre-storage pit, a cover plate, an opening and closing plate and a heating pipe group; the pre-storage pit is used to store high-water content sludge; the cover plate is used to cover the pre-storage pit; the opening and closing plate is used to cover or expose the mud inlet; the heating pipe group is arranged in the pre-storage pit, and the exhaust gas passes through the heating pipe group to pre-dehydrate the high-water content sludge to obtain pre-dehydrated sludge and pre-stored waste gas; a drying device, using high-temperature steam to dry the pre-dehydrated sludge to form dried sludge, dried waste gas and dried waste water, and the high-temperature steam becomes exhaust gas after losing heat; a grinding device, used to crush the dried sludge into mud powder; a combustion purification device, used to burn mud powder, dried waste gas and pre-stored waste gas to generate combustion residue and combustion waste gas, and purify the combustion waste gas. The system solves the problem of high sludge treatment cost caused by high sludge water content in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge drying treatment, in particular to a sludge drying and blending combustion energy-saving system. Background Art

[0002] In recent years, the process of urban ecological civilization construction in my country has been accelerating, and the output of urban sludge has increased significantly, but the harmless disposal has not reached 100%. Among the many harmless disposal methods, relying on the efficient combustion system of coal-fired power plants and the centralized pollutant treatment facilities to coordinate the treatment of sludge is considered to be an effective way to solve the rare urban sludge treatment. Sludge drying can increase the calorific value and increase the processing volume, and is deeply favored by the coal-fired boiler coordinated incineration industry. However, the commonly used drying methods have defects such as high energy consumption and high waste gas and wastewater production. The fundamental reason is that the moisture content of the incoming sludge is too high. The moisture content of the outgoing sludge is generally above 60%. It consumes a lot of energy to directly dry this high-moisture sludge through a sludge dryer, resulting in high sludge treatment costs. Therefore, there is an urgent need for a device that can solve at least one of the above problems. Utility Model Content

[0003] The purpose of the embodiment of the utility model is to provide a sludge drying and co-combustion energy-saving system for solving the problem of high sludge treatment cost caused by high sludge water content in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a sludge drying and blending combustion energy-saving system, the sludge drying and blending combustion energy-saving system comprises:

[0005] The storage device comprises: a pre-storage pit, a cover plate, an opening and closing plate and a heating tube group;

[0006] The pre-storage pit is used to store sludge with high water content, and the pre-storage pit has a pit opening;

[0007] The cover plate is provided with a mud inlet, and the cover plate is arranged at the pit opening of the pre-storage pit to cover the pre-storage pit;

[0008] The opening and closing plate is movably arranged at the mud inlet, and is used to cover or expose the mud inlet;

[0009] The heating tube group is arranged in the pre-storage pit, and the exhaust gas is heat-exchanged with the high-water-content sludge in the pre-storage pit through the heating tube group, thereby pre-dehydrating the high-water-content sludge to obtain pre-dehydrated sludge and pre-stored exhaust gas;

[0010] A drying device, connected to the storage device, for drying the pre-dewatered sludge using high-temperature steam to form dried sludge, dried waste gas and dried waste water, wherein the high-temperature steam becomes exhaust gas after losing heat and is transported to the storage device;

[0011] A grinding device, connected to the drying device, for crushing the dried sludge into sludge powder;

[0012] A combustion purification device comprises a combustion component and a purification component; the combustion component is connected to the grinding device, the drying device and the storage device, the combustion component is used to burn the mud powder, the drying waste gas and the pre-stored waste gas to generate combustion residue and combustion waste gas; the purification component is connected to the combustion component and is used to purify and treat the combustion waste gas.

[0013] Specifically, the heating pipe group includes heating pipes arranged at the bottom and wall of the pre-storage pit, and the exhaust gas flows in the heating pipes to achieve heat exchange with the high-water content sludge in the pre-storage pit.

[0014] Specifically, the storage device further includes: a heat conducting plate, which is arranged on the pit bottom and pit wall of the pre-storage pit, and the heating pipe is separated from the high-water content sludge by the heat conducting plate.

[0015] Specifically, the heating tube group includes: two main air supply pipes and a plurality of branch air supply pipes;

[0016] Two air supply main pipes are arranged on the inner surface of the cover plate at a given interval, wherein each air supply main pipe is provided with an air inlet and multiple air outlets, the air outlets on the two air supply main pipes correspond to each other, and an air supply branch pipe is arranged between the corresponding air outlets of the two air supply main pipes, and the exhausted gas enters through the air inlet of one of the air supply main pipes, flows through multiple air supply branch pipes, and then flows out from the air inlet of the other air supply main pipe.

[0017] Specifically, the storage device also includes: a sump and a filter grille;

[0018] The water collection pit is a sunken pit formed by a part of the bottom of the pre-storage pit being sunken downward, and is used to collect wastewater seeping from the high-water content sludge;

[0019] The filter grid is a part of the bottom of the pre-storage pit, covering the pit mouth of the sump.

[0020] The filter grid has filter holes, and wastewater in the high-water content sludge enters the sump through the filter holes on the filter grid.

[0021] Specifically, a plurality of drainage grooves are provided at the bottom of the pre-storage pit, and each drainage groove is connected to the sump.

[0022] Specifically, the sludge drying and co-combustion energy-saving system also includes: a wastewater treatment device, which is connected to the drying device and the sump and is used to purify and treat the wastewater seeping from the high-water content sludge and the drying wastewater.

[0023] Specifically, the sludge drying and incineration energy-saving system also includes: a micro-negative pressure device, which is connected to the storage device and the drying device and is used to adjust the vacuum degree in the storage device and the drying device.

[0024] Specifically, the micro-negative pressure device includes: a vacuum degree detector, an exhaust fan and a frequency conversion regulator;

[0025] The vacuum degree detector is used to detect the vacuum degree in the pre-storage pit and the drying device;

[0026] The exhaust fan is connected to the pre-storage pit, the drying device and the combustion purification device through a pipeline, and is used to extract the pre-stored waste gas in the pre-storage pit and the dried waste gas from the drying device to the combustion purification device;

[0027] The variable frequency regulator is connected to the vacuum detector and the exhaust fan signal, and is used to adjust the start and stop of the exhaust fan according to the vacuum degree in the pre-storage pit and the drying device.

[0028] Specifically, the sludge drying and co-combustion energy-saving system further includes: an exhaust gas control device;

[0029] The exhaust gas control device includes a temperature sensor, an exhaust gas controller and an exhaust gas control valve;

[0030] The temperature sensor is arranged in the pre-storage pit and is used to detect the temperature of the high-water content sludge in the pre-storage pit;

[0031] The exhaust gas controller is connected to the temperature sensor and the exhaust gas control valve signal, and is used to control the opening and closing of the exhaust gas control valve according to the temperature of the high-water content sludge;

[0032] The exhaust gas control valve is arranged at the exhaust gas inlet of the heating tube assembly, and is used to control the flow state of the exhaust gas in the heating tube assembly.

[0033] The utility model provides a sludge drying and co-combustion energy-saving system, in which high-water-content sludge is stored in a pre-storage pit of a storage device, a heating pipe group is arranged in the pre-storage pit, and exhaust gas is used to enter the heating pipe group to perform pre-dehydration treatment on the high-water-content sludge to reduce the water content of the high-water-content sludge, thereby playing a role in preliminary dehydration of the high-water-content sludge. After the high-water-content sludge is pre-dehydrated, pre-dehydrated sludge and pre-stored exhaust gas are obtained. In order to prevent the pre-stored exhaust gas from overflowing, a cover plate is arranged at the pit mouth of the pre-storage pit to seal the pre-storage pit, and an openable and closable opening and closing plate is arranged at the mud inlet on the cover plate to facilitate the high-water-content sludge to enter the pre-storage pit from the mud inlet, the pre-dehydrated sludge enters the drying device, the drying device further dries the pre-dehydrated sludge by high-temperature steam, the high-temperature steam performs heat exchange with the pre-dehydrated sludge in the drying device, and the high-temperature steam After losing heat, the steam becomes exhaust gas and is transported to the storage device as a heat source for pre-dehydration of high-moisture content sludge. The dried sludge formed after the pre-dehydrated sludge is dried enters the grinding device, and the dried sludge is crushed into mud powder by the grinding device and transported to the combustion component of the combustion purification device for combustion. The pre-stored waste gas formed by the pre-dehydration treatment of the high-moisture content sludge in the storage device and the dry waste gas formed by the drying device when drying the pre-dehydrated sludge also enter the combustion component for combustion. The combustion waste gas formed after combustion is purified by the purification component and then discharged. In this way, the high-moisture content sludge is harmlessly treated. At the same time, the waste heat of high-temperature steam is fully utilized through the pre-dehydration treatment of the high-moisture content sludge, which reduces the energy consumption in the sludge drying process and solves the problem of high sludge treatment cost caused by high sludge moisture content in the prior art.

[0034] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0036] Figure 1 It is a schematic diagram of the layout of the sludge drying and blending energy-saving system provided by the embodiment of the utility model;

[0037] Figure 2 The utility model provides a storage device in the sludge drying and blending energy-saving system.

[0038] Schematic diagram;

[0039] Figure 3 It is a structural schematic diagram of a storage device in a sludge drying and blending energy-saving system provided by another embodiment of the utility model;

[0040] Figure 4 yes Figure 3Top view of the storage device in the sludge drying and co-combustion energy-saving system.

[0041] Description of Reference Numerals

[0042] 1-storage device; 2-drying device; 3-grinding device; 4-combustion purification device; 7-wastewater treatment device; 8-circulating water treatment system; 11-pre-storage pit; 12-cover plate; 13-heating pipe group; 14-water collection pit; 15-filter grid; 16-opening and closing plate; 131-heating pipe; 132-air supply main pipe; 133-air supply branch pipe. DETAILED DESCRIPTION

[0043] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0044] Figure 1 It is a schematic diagram of the layout of the sludge drying and blending energy-saving system provided by the embodiment of the utility model; Figure 2 It is a structural schematic diagram of a storage device in a sludge drying and blending energy-saving system provided by an embodiment of the utility model; Figure 3 It is a structural schematic diagram of a storage device in a sludge drying and blending energy-saving system provided by another embodiment of the utility model; Figure 4 yes Figure 3 Top view of the storage device in the sludge drying and co-combustion energy-saving system.

[0045] like Figure 1-Figure 4 As shown, the utility model provides a sludge drying and blending combustion energy-saving system, and the sludge drying and blending combustion energy-saving system comprises:

[0046] The storage device 1 is used for storing high-water content sludge and pre-dehydrating the high-water content sludge by using the exhaust gas to obtain pre-dehydrated sludge and pre-stored waste gas;

[0047] A drying device 2, connected to the storage device 1, for drying the pre-dewatered sludge using high-temperature steam to form dried sludge, dried waste gas and dried waste water, wherein the high-temperature steam becomes exhaust gas after losing heat and is transported to the storage device 1;

[0048] A grinding device 3, connected to the drying device 2, for crushing the dried sludge into sludge powder;

[0049] The combustion purification device 4 includes a combustion component and a purification component; the combustion component is connected to the grinding device 3, the drying device 2 and the storage device 1, and the combustion component is used to burn the mud powder, the drying waste gas and the pre-stored waste gas to generate combustion residue and combustion waste gas; the purification component is connected to the combustion component and is used to purify and treat the combustion waste gas.

[0050] The utility model provides a sludge drying and co-combustion energy-saving system. After the high-temperature steam dries the pre-dehydrated sludge in the drying device 2, it loses heat and becomes exhaust gas. The exhaust gas is used to pre-dehydrate the high-water content sludge stored in the storage device 1, which not only makes full use of the waste heat of the high-temperature steam, but also reduces the energy consumption of subsequent sludge drying. The exhaust gas enters the storage device 1 and exchanges heat with the high-water content sludge to heat the high-water content sludge to reduce the water content in the high-water content sludge, thereby completing the pre-dehydration treatment of the high-water content sludge. After the pre-dehydration treatment of the high-water content sludge, pre-dehydrated sludge and pre-stored exhaust gas are formed. The pre-dehydrated sludge is passed through the storage device 1. The sludge is sent to the drying device 2 for drying through a screw conveyor, and the high-temperature steam enters the drying device 2 for heat exchange with the pre-dehydrated sludge. The high-temperature steam exchanges heat with the pre-dehydrated sludge to heat the pre-dehydrated sludge, thereby reducing the water content in the pre-dehydrated sludge. After the high-temperature steam exchanges heat with the pre-dehydrated sludge, it loses heat and becomes exhaust gas. The exhaust gas temperature is about 100-110°C. The exhaust gas is transported to the storage device 1. The exhaust gas loses heat and becomes condensed waste water after pre-dehydrating the high-water content sludge in the storage device 1. The condensed waste water is sent to the circulating water treatment system 8 for treatment, and the treated condensed waste water is sent to the coal-fired power plant for use. After the pre-dehydrated sludge is dried in the drying device 2, dried sludge, dried waste gas and dried waste water are formed. The dried sludge is sent to the grinding device 3 to be ground into mud powder. The grinding device 3 is a coal mill. The grinding device 3 can grind the dried sludge and fuel coal together, and then the ground mud powder and coal powder are sent to the combustion component of the combustion purification device 4 for combustion. The combustion component is a boiler. The pre-stored waste gas and the dried waste gas obtained in the pre-dehydration treatment of the high-water content sludge are also sent to the combustion component of the combustion purification device 4 for combustion. The combustion waste residue generated after combustion is discharged from the combustion component, and the combustion waste gas is discharged after purification by the purification component of the combustion purification device 4. The purification component is a waste gas treatment equipment, thereby completing the harmless treatment of the sludge, which solves the problem of pollution caused by the high water content of the sludge in the prior art.

[0051] The problem of high sludge treatment cost is solved by pre-dehydration treatment, which makes full use of the waste heat of high-temperature steam, reduces the energy consumption in the sludge drying process, and also reduces the output of dried wastewater.

[0052] In order to use the exhaust gas to pre-dehydrate the sludge with high water content, the storage device 1 includes: a pre-storage pit 11, a cover plate 12, an opening and closing plate 16 and a heating pipe group 13;

[0053] The pre-storage pit 11 is used to store sludge with high water content, and the pre-storage pit 11 has a pit opening;

[0054] The cover plate 12 is provided with a mud inlet, and the cover plate 12 is arranged at the pit opening of the pre-storage pit 11 to cover the pre-storage pit 11;

[0055] The opening and closing plate 16 is movably arranged at the mud inlet, and is used to cover or expose the mud inlet;

[0056] The heating tube group 13 is disposed in the pre-storage pit 11 , and the exhaust gas is heat-exchanged with the high-water-content sludge in the pre-storage pit 11 through the heating tube group 13 to perform pre-dehydration treatment on the high-water-content sludge.

[0057] A cover plate 12 is provided at the pit opening of the pre-storage pit 11 to prevent the high-water content sludge odor or pre-stored waste gas from overflowing and polluting the environment. In order to facilitate the transportation of high-water content sludge into the pre-storage pit 11, a mud inlet is provided on the cover plate 12. When the high-water content sludge is transported into the pre-storage pit 11, the opening and closing plate 16 is opened to expose the mud inlet, and the high-water content sludge enters the pre-storage pit 11 through the mud inlet. After the high-water content sludge is transported into the pre-storage pit 11, the opening and closing plate 16 is closed to cover the mud inlet to prevent the odor or pre-stored waste gas from overflowing from the mud inlet. In order to pre-dehydrate the high-water content sludge by exhaust gas, a heating pipe group 13 is provided in the pre-storage pit 11. The exhaust gas flows in the heating pipe group 13 to exchange heat with the high-water content sludge stored in the pre-storage pit 11 to pre-dehydrate the high-water content sludge, making full use of the waste heat of the exhaust gas.

[0058] In one example, if Figure 2 As shown, the heating pipe group 13 includes heating pipes 131 arranged at the pit bottom and pit wall of the pre-storage pit 11, and the exhaust gas flows in the heating pipes 131 to achieve heat exchange with the high-water content sludge in the pre-storage pit 11.

[0059] The storage device 1 further comprises: a heat conducting plate, which is arranged at the pit bottom and pit wall of the pre-storage pit 11, and the heating pipe 131 is separated from the high-water content sludge by the heat conducting plate.

[0060] A heating pipe 131 is laid on the pit bottom and pit wall of the pre-storage pit 11. The heating pipe 131 is arranged in a serpentine shape on the pit bottom and pit wall. Exhaust gas enters from a port at one end of the heating pipe 131, and exchanges heat with the high-water content sludge in the process of flowing through the heating pipe 131. After losing heat, the exhaust gas becomes condensed wastewater and is discharged from the other end of the heating pipe 131 into the circulating water treatment system 8 for treatment. In order to prevent the high-water content sludge from adhering to the surface of the heating pipe 131 and between the pit bottom and pit wall, thereby affecting the heat exchange efficiency, a heat conducting plate is arranged to separate the high-water content sludge and the heating pipe 131. The heat conducting plate is arranged in contact with the surface of the heating pipe 131, and the heating pipe 131 is isolated from the heat conducting plate and the pit bottom and pit wall by the heat conducting plate. The heat of the exhaust gas is transferred to the heat conducting plate through the heating pipe 131, and then transferred to the high-water content sludge through the heat conducting plate, thereby completing the pre-dehydration treatment of the high-water content sludge.

[0061] In another embodiment, if Figure 3As shown, the heating tube group 13 includes: two air supply main pipes 132 and a plurality of air supply branch pipes 133;

[0062] Two air supply main pipes 132 are arranged on the inner surface of the cover plate 12 at a given interval, wherein each air supply main pipe 132 is provided with an air inlet and multiple air outlets, the air outlets of the two air supply main pipes 132 correspond to each other, and an air supply branch pipe 133 is arranged between the corresponding air outlets of the two air supply main pipes 132. The exhausted gas enters through the air inlet of one of the air supply main pipes 132, flows through multiple air supply branch pipes 133, and then flows out from the air inlet of the other air supply main pipe 132.

[0063] The cover plate 12 covers the pit opening of the pre-storage pit 11, and a mud inlet is provided on the cover plate 12. When the opening and closing plates 16 at the mud inlet are opened, the sludge with high water content can enter the pre-storage pit 11 from the mud inlet. When the opening and closing plates 16 at the mud inlet are closed, the odor in the pre-storage pit 11 can be prevented from overflowing. Two air supply main pipes 132 are arranged on the side of the cover plate 12 facing the pit bottom of the pre-storage pit 11, and an air supply branch pipe 133 is arranged between the corresponding air outlets of the two air supply main pipes 132. After the exhausted gas enters from the air inlet of one of the air supply main pipes 132, it enters into the corresponding air supply branch pipe 133 through the multiple air outlets of the air supply main pipe 132. Figure 3 As shown, when the cover plate 12 is sealed at the pit mouth of the pre-storage pit 11, each air supply branch pipe 132 is sunk into the pre-storage pit 11, and the exhaust gas exchanges heat with the high-water content sludge when passing through each air supply branch pipe 133, thereby pre-dehydrating the high-water content sludge, and the exhaust gas after losing heat becomes condensed wastewater from the intake air of another air supply main pipe 132.

[0064] The exhaust gas is discharged from the outlet and enters the circulating water treatment system 8 for treatment. In order to make full use of the waste heat of the exhaust gas, each air supply branch pipe 133 is arranged in a serpentine shape, extending the flow path of the exhaust gas in the air supply branch pipe 133 so that the waste heat of the exhaust gas can be fully utilized, saving energy.

[0065] The high-water content sludge has a relatively high water content. In order to collect the sewage seeping from the high-water content sludge, the storage device 1 further includes: a sump 14 and a filter grid 15;

[0066] The water collection pit 14 is a sunken pit formed by a part of the bottom of the pre-storage pit 11 being sunken downward, and is used to collect wastewater seeping from the high-water content sludge;

[0067] The filter grid 15 serves as a part of the bottom of the pre-storage pit 11 and covers the pit opening of the sump 14 . The filter grid 15 has filter holes, and wastewater in the high-water content sludge enters the sump 14 through the filter holes on the filter grid 15 .

[0068] A plurality of drainage grooves are provided at the bottom of the pre-storage pit 11 , and each drainage groove is connected to the sump 14 .

[0069] A sump 14 is formed by excavating the bottom of the pre-storage pit 11, and a drainage trough is set at the bottom of the pre-storage pit 11. Each drainage trough is connected to the sump 14. The multiple drainage troughs can better guide the seeping sewage into the sump 14. In order to prevent sludge from entering the sump 14, an interception filter is set at one end of each drainage trough connected to the sump 14. The sewage enters the sump 14 through the interception filter, and the sludge cannot pass through the interception filter. In order to speed up the drainage efficiency of the drainage trough, each The horizontal height of one end port of the drainage trough connected to the sump 14 is lower than the horizontal height of the other end port of the drainage trough. A filter grille 15 is arranged at the pit mouth of the sump 14 to prevent sludge from entering the sump 14 and to allow wastewater to pass through the filter holes on the filter grille 15 and enter the sump 14. In order to transport the wastewater in the sump 14 to the wastewater treatment device 7, a submersible sewage pump is arranged in the sump 14, and the wastewater collected in the sump 14 is pumped to the wastewater treatment device 7 by the submersible sewage pump.

[0070] In order to treat the wastewater in the sludge, the sludge drying and incineration energy-saving system also includes: a wastewater treatment device 7, which is connected to the drying device 2 and the sump 14, and is used to purify the wastewater seeping from the high-water content sludge and the drying wastewater.

[0071] The wastewater seeping from the sludge with high moisture content and the dried wastewater generated by the drying device 2 during the sludge drying process are sent to the wastewater treatment device 7 for treatment. The wastewater treatment device 7 can use advanced oxidation method or biological treatment method to treat the wastewater seeping from the sludge with high moisture content and the dried wastewater.

[0072] In order to avoid the overflow of pre-stored waste gas in the storage device 1 and the overflow of dried waste gas in the drying device 2, the sludge drying and co-combustion energy-saving system also includes: a micro-negative pressure device, which is connected to the storage device 1 and the drying device 2, and is used to adjust the vacuum degree in the storage device 1 and the drying device 2.

[0073] The micro-negative pressure device comprises: a vacuum degree detector, an exhaust fan and a frequency conversion regulator;

[0074] The vacuum degree detector is used to detect the vacuum degree in the pre-storage pit 11 and the drying device 2;

[0075] The exhaust fan is connected to the pre-storage pit 11, the drying device 2 and the combustion purification device 4 through a pipeline, and is used to pump the pre-stored exhaust gas in the pre-storage pit 11 and the dried exhaust gas from the drying device 2 to the combustion purification device 4;

[0076] The frequency conversion regulator is connected to the vacuum detector and the exhaust fan signal, and is used to start and stop the exhaust fan according to the vacuum degree in the pre-storage pit 11 and the drying device 2.

[0077] The exhaust fan of the micro-negative pressure device extracts the pre-stored waste gas in the pre-storage pit 11 and the dried waste gas in the drying device 2 to the combustion purification device 4 for combustion. After the exhaust fan extracts the pre-stored waste gas and the dried waste gas, the storage device 1 and the drying device 2 are in a micro-negative pressure state, which can prevent the waste gas in the storage device 1 and the drying device 2 from leaking out. In order to facilitate the staff to better grasp the vacuum state in the pre-storage pit 11 and the drying device 2, a vacuum detector is provided to monitor the vacuum degree in the pre-storage pit 11 and the drying device 2 in real time. The frequency converter controls the start and stop of the exhaust fan according to the vacuum degree in the pre-storage pit 11 and the drying device 2, thereby controlling the vacuum degree in the pre-storage pit 11 and the drying device 2 within the required range, so that the pre-storage pit 11 and the drying device 2 are in a micro-negative pressure state. Under the micro-negative pressure state, the overflow of the pre-storage waste gas in the pre-storage pit 11 and the overflow of the dried waste gas in the drying device 2 can be better avoided.

[0078] In order to avoid energy waste, the sludge drying and blending energy-saving system further comprises: an exhaust gas control device;

[0079] The exhaust gas control device includes a temperature sensor, an exhaust gas controller and an exhaust gas control valve;

[0080] The temperature sensor is arranged in the pre-storage pit 11, and is used to detect the temperature of the high-water content sludge in the pre-storage pit 11;

[0081] The exhaust gas controller is connected to the temperature sensor and the exhaust gas control valve signal, and is used to control the opening and closing of the exhaust gas control valve according to the temperature of the high-water content sludge;

[0082] The exhaust gas control valve is disposed at the exhaust gas inlet of the heating tube assembly 13 to control the flow state of the exhaust gas in the heating tube assembly 13 .

[0083] The temperature of the high-water-content sludge is detected by a temperature sensor and sent to the exhaust gas controller. The exhaust gas controller determines that the temperature of the high-water-content sludge is lower than the set temperature, and the exhaust gas controller controls the exhaust gas control valve to open, so that the exhaust gas can enter the heating tube group 13 and flow in the heating tube group 13 to exchange heat with the high-water-content sludge to perform pre-dehydration treatment. The exhaust gas controller determines that the temperature of the high-water-content sludge is higher than the set temperature, and the exhaust gas controller controls the exhaust gas control valve to close, and the exhaust gas stops entering the heating tube group 13.

[0084] The utility model provides a sludge drying and co-combustion energy-saving system, in which high-water-content sludge is stored in a storage device, and exhaust gas is used to pre-dehydrate the high-water-content sludge to reduce the water content of the high-water-content sludge, thereby playing a role in preliminary dehydration of the high-water-content sludge. After pre-dehydration, the high-water-content sludge becomes pre-dehydrated sludge and pre-stored exhaust gas, and the pre-dehydrated sludge enters the drying device, and the drying device further dries the pre-dehydrated sludge by high-temperature steam. The high-temperature steam performs heat exchange with the pre-dehydrated sludge in the drying device, and the high-temperature steam becomes exhaust gas after losing heat and is transported to the storage device as the pre-dehydration of the high-water-content sludge. Heat source, the dried sludge formed after the pre-dewatered sludge is dried enters the grinding device, and the dried sludge is crushed into mud powder by the grinding device and transported to the combustion component of the combustion purification device for combustion. The pre-stored waste gas formed by the pre-dewatering treatment of the high-water content sludge in the storage device and the dried waste gas formed by the drying device when drying the pre-dewatered sludge also enter the combustion component for combustion. The combustion waste gas formed after combustion is purified by the purification component and then discharged. In this way, the high-water content sludge is harmlessly treated. At the same time, the high-water content sludge is fully utilized through the pre-dehydration treatment of the high-water content sludge, which reduces the sludge drying process.

[0085] The energy consumption is reduced, and the problem of high sludge treatment cost caused by high sludge moisture content in the prior art is solved.

[0086] The optional implementation modes of the embodiments of the utility model are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the utility model, the technical scheme of the embodiments of the utility model can be subjected to various simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0087] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the utility model will not further describe various possible combinations.

[0088] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A sludge drying and blending energy-saving system, characterized in that: The sludge drying and blending energy-saving system comprises: The storage device (1) comprises: a pre-storage pit (11), a cover plate (12), an opening and closing plate (16) and a heating tube group (13); The pre-storage pit (11) is used to store sludge with high water content, and the pre-storage pit (11) has a pit opening; The cover plate (12) is provided with a mud inlet, and the cover plate (12) is arranged at the pit opening of the pre-storage pit (11) to cover the pre-storage pit (11); The opening and closing plate (16) is movably arranged at the mud inlet and is used to cover or expose the mud inlet; The heating tube group (13) is arranged in the pre-storage pit (11), and the exhaust gas is heat-exchanged with the high-water-content sludge in the pre-storage pit (11) through the heating tube group (13), thereby pre-dehydrating the high-water-content sludge to obtain pre-dehydrated sludge and pre-stored exhaust gas; A drying device (2) connected to the storage device (1) is used to use high-temperature steam to dry the pre-dewatered sludge to form dried sludge, dried waste gas and dried waste water, and the high-temperature steam becomes exhaust gas after losing heat and is transported to the storage device (1); A grinding device (3), connected to the drying device (2), for crushing the dried sludge into sludge powder; A combustion purification device (4) comprises a combustion component and a purification component; the combustion component is connected to the grinding device (3), the drying device (2) and the storage device (1), and the combustion component is used to burn the mud powder, the drying waste gas and the pre-stored waste gas to generate combustion residue and combustion waste gas; the purification component is connected to the combustion component and is used to purify and treat the combustion waste gas.

2. The sludge drying and blending energy-saving system according to claim 1 is characterized in that: The heating pipe group (13) comprises heating pipes (131) arranged at the bottom and the wall of the pre-storage pit (11), and the exhaust gas flows in the heating pipes (131) to achieve heat exchange with the high-water content sludge in the pre-storage pit (11).

3. The sludge drying and blending energy-saving system according to claim 1 is characterized in that: The storage device (1) further comprises: a heat conducting plate, which is arranged at the bottom and the wall of the pre-storage pit (11), and the heating pipe (131) is separated from the high-water content sludge by the heat conducting plate.

4. The sludge drying and blending energy-saving system according to claim 1 is characterized in that: The heating pipe group (13) comprises: two air supply main pipes (132) and a plurality of air supply branch pipes (133); Two air supply main pipes (132) are arranged on the inner surface of the cover plate (12) at a given interval, wherein each air supply main pipe (132) is provided with an air inlet and a plurality of air outlets, the air outlets of the two air supply main pipes (132) correspond to each other, and an air supply branch pipe (133) is arranged between the corresponding air outlets of the two air supply main pipes (132), and the exhausted gas enters through the air inlet of one of the air supply main pipes (132), flows through the plurality of air supply branch pipes (133), and then flows out from the air inlet of the other air supply main pipe (132).

5. The sludge drying and blending energy-saving system according to claim 1 is characterized in that: The storage device (1) further comprises: a sump (14) and a filter grid (15); The water collection pit (14) is a sunken pit formed by a portion of the bottom of the pre-storage pit (11) being sunken downward, and is used to collect wastewater seeping from the high-water content sludge; The filter grid (15) serves as a part of the bottom of the pre-storage pit (11), covering the pit opening of the sump (14); the filter grid (15) has filter holes, and wastewater in the high-water content sludge enters the sump (14) through the filter holes on the filter grid (15).

6. The sludge drying and blending energy-saving system according to claim 5 is characterized in that: The bottom of the pre-storage pit (11) is provided with a plurality of drainage grooves, and each drainage groove is connected to the sump (14).

7. The sludge drying and blending energy-saving system according to claim 6 is characterized in that: The sludge drying and incineration energy-saving system also includes: a wastewater treatment device (7), which is connected to the drying device (2) and the sump (14) and is used to purify the wastewater seeping from the high-water content sludge and the dried wastewater.

8. The sludge drying and blending energy-saving system according to claim 1 is characterized in that: The sludge drying and incineration energy-saving system also includes: a micro-negative pressure device, which is connected to the storage device (1) and the drying device (2) and is used to adjust the vacuum degree in the storage device (1) and the drying device (2).

9. The sludge drying and blending energy-saving system according to claim 8 is characterized in that: The micro-negative pressure device comprises: a vacuum degree detector, an exhaust fan and a frequency conversion regulator; The vacuum degree detector is used to detect the vacuum degree in the pre-storage pit (11) and the drying device (2); The exhaust fan is connected to the pre-storage pit (11), the drying device (2) and the combustion purification device (4) through a pipeline, and is used to extract the pre-stored waste gas in the pre-storage pit (11) and the dried waste gas from the drying device (2) into the combustion purification device (4); The variable frequency regulator is connected to the vacuum detector and the exhaust fan signal, and is used to adjust the start and stop of the exhaust fan according to the vacuum degree in the pre-storage pit (11) and the drying device (2).

10. The sludge drying and blending energy-saving system according to claim 1 is characterized in that: The sludge drying and blending energy-saving system also includes: an exhaust gas control device; The exhaust gas control device includes a temperature sensor, an exhaust gas controller and an exhaust gas control valve; The temperature sensor is arranged in the pre-storage pit (11) and is used to detect the temperature of the high-water content sludge in the pre-storage pit (11); The exhaust gas controller is connected to the temperature sensor and the exhaust gas control valve signal, and is used to control the opening and closing of the exhaust gas control valve according to the temperature of the high-water content sludge; The exhaust gas control valve is arranged at the exhaust gas inlet of the heating tube assembly (13) and is used to control the flow state of the exhaust gas in the heating tube assembly (13).

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