Flue gas waste heat low-temperature sludge drying system with distributed optimized energy configuration

Abstract

The utility model discloses a flue gas waste heat low-temperature sludge drying system and a flue gas waste heat low-temperature sludge drying method capable of optimizing energy configuration in a distributed manner, comprising a sludge drying device, and a wet sludge feeding device, a dried sludge collecting and treating device and a hot gas source or flue gas waste heat utilization device which are respectively connected with the sludge drying device, the sludge drying device comprises first-stage dryers and second-stage dryers, feed ports of the two first-stage dryers are respectively connected with the wet sludge feeding device, and discharge ports of the two first-stage dryers are connected with a feed port of the second-stage dryer through the cooling and conveying device; the two groups of first-stage drying machines and the group of second-stage drying machines are respectively communicated with a hot gas source or a flue gas waste heat utilization device; and a discharge hole of the second-stage drying machine is connected with a dried sludge collecting and treating device. According to the utility model, the two-stage or three-stage drying machine is arranged, so that the sludge material is subjected to distributed energy configuration optimization drying, the sludge drying effect and yield are improved, and the adverse effects that the finished sludge is easy to get damp and form balls, the water content of the finished sludge is high and the like are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of material drying and waste heat utilization, in particular to a flue gas waste heat low-temperature drying sludge system with optimized energy distribution. Background Technique

[0002] In the existing technology of using flue gas to dry sludge, due to unreasonable flue gas waste heat distribution methods and other factors, problems such as low sludge drying production capacity, easy moisture return and caking of the finished sludge, or high moisture content of the finished sludge, which is not conducive to subsequent resource utilization, require optimization of the flue gas distribution to improve the utilization efficiency of flue gas waste heat and increase the sludge drying production capacity. Content of the Utility Model

[0003] The purpose of the utility model is to provide a flue gas waste heat low-temperature drying sludge system and method with optimized energy distribution, which can reasonably distribute and utilize flue gas waste heat, improve the sludge drying effect and output, and reduce the adverse effects such as easy moisture return and caking of the finished sludge and high moisture content of the finished sludge.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A flue gas waste heat low-temperature drying sludge system with optimized energy distribution includes a sludge drying device, a wet sludge feeding device, a sludge collection and treatment device after drying, and a hot gas source or flue gas waste heat utilization device, which are respectively connected to the sludge drying device. The sludge drying device includes a plurality of dryers, and the dryers are two groups of primary dryers and one group of secondary dryers. The feeding ports of the two groups of primary dryers are respectively connected to the wet sludge feeding device, and the discharging ports of the two groups of primary dryers are both connected to the feeding port of the secondary dryer through a cooling and conveying device; the hot air inlets and exhaust outlets of the two groups of primary dryers and one group of secondary dryers are respectively connected to the hot gas source or flue gas waste heat utilization device through an air inlet pipe and an exhaust pipe by respective pipelines; the discharging port of the secondary dryer is connected to the sludge collection and treatment device after drying.

[0006] The sludge drying device of this solution includes multiple dryers, which are divided into two groups, namely primary dryers and secondary dryers. Among them, multiple (two or more) primary dryers correspond to one secondary dryer. The flue gas generated by the hot gas source or the flue gas waste heat utilization device is reasonably distributed through the air inlet pipe and then enters the primary dryers and secondary dryers respectively. Fresh sludge materials are distributed into multiple primary dryers. At this time, the moisture content of the sludge materials is the highest. After being dried by the primary dryers, the sludge materials processed by the multiple primary dryers are sent into the corresponding secondary dryers. At this time, the moisture content of the sludge materials decreases but the total amount increases. The air volume of the flue gas entering different dryers can be adjusted according to the moisture content of the sludge materials. In the primary dryer, when the flue gas dries the sludge materials, water turns into water vapor and mixes in the flue gas. When the water vapor in the flue gas is saturated, the remaining moisture in the sludge materials is difficult to evaporate. Therefore, the secondary dryer can be used to perform secondary drying on the sludge materials processed by the primary dryer. The flue gas introduced into the secondary dryer is dry flue gas, which can carry the water vapor generated by a large amount of secondary-dried sludge materials, making the moisture content of the sludge materials continue to decrease.

[0007] A flue gas waste heat low-temperature drying sludge system with optimized energy distribution includes a sludge drying device, a wet sludge feeding device, a sludge collection and treatment device after drying, and a hot gas source or a flue gas waste heat utilization device, which are respectively connected to the sludge drying device. The sludge drying device includes multiple dryers. The dryers are several pairs of primary dryers, several groups of secondary dryers corresponding to the paired primary dryers, and several groups of tertiary dryers corresponding to the paired secondary dryers. The feeding ports of several groups of the primary dryers are respectively connected to the wet sludge feeding device. The discharging ports of two groups of the primary dryers are both connected to the feeding ports of the corresponding secondary dryers through a cooling conveying device. The discharging ports of two groups of the secondary dryers are both connected to the feeding ports of the corresponding tertiary dryers through a cooling conveying device. The hot air inlets and exhaust outlets of the primary dryers, secondary dryers, and tertiary dryers are respectively connected to the hot gas source or the flue gas waste heat utilization device through an air inlet pipe and an exhaust pipe. The discharging port of the tertiary dryer is connected to the sludge collection and treatment device after drying.

[0008] This solution adopts a three - level configuration of a primary dryer, a secondary dryer, and a tertiary dryer. One tertiary dryer corresponds to multiple secondary dryers, and one secondary dryer corresponds to multiple primary dryers. The flue gas generated by the hot gas source or the flue gas waste heat utilization device is reasonably distributed through the air inlet pipeline and then enters the primary dryer, secondary dryer, and tertiary dryer respectively. One tertiary dryer receives the sludge materials processed by multiple secondary dryers, and one secondary dryer receives the sludge materials processed by multiple primary dryers. According to the different water contents of the sludge materials to be processed, the flue gas is reasonably distributed through the air inlet pipeline and enters different dryers. For example, a flow valve is used to control the air volume of the flue gas. After the drying process in the dryer, the flue gas with water vapor enters the exhaust pipeline uniformly and then returns to the original flue gas treatment pipeline. The air volume of the flue gas with water vapor entering the exhaust pipeline can also be controlled by a flow valve or the like to adjust the air volume size.

[0009] As a preferred solution of the present utility model, the flue gas waste heat utilization device includes a flue gas treatment pipeline. The flue gas treatment pipeline is provided with a flue gas inlet, a dust collector, and an exhaust fan. A main valve is provided on the pipeline between the dust collector and the exhaust fan. The pipeline between the dust collector and the main valve is communicated with the air inlet pipeline. The air inlet pipeline is provided with an air inlet valve and an air inlet fan. The pipeline between the main valve and the exhaust fan is communicated with the exhaust pipeline. The exhaust pipeline is provided with an exhaust valve. The combination of the main valve, the air inlet valve, and the exhaust valve in this solution, when drying is required, the main valve is closed or the ventilation volume of the flue gas treatment pipeline is reduced, the air inlet valve and the exhaust valve are opened. The flue gas enters the air inlet pipeline from the intake valve and is distributed into different dryers. After the flue gas comes out of the dryer, it returns to the flue gas treatment pipeline through the exhaust pipeline and the exhaust valve. Both the intake valve and the exhaust valve can adjust the flue gas flow rate.

[0010] As a preferred solution of the present utility model, a multi - tube dust removal device or a gravity dust removal device is further provided on the exhaust pipeline. In this solution, the flue gas is treated by the dust collector in the flue gas treatment pipeline and then enters the air inlet pipeline. After the flue gas passes through the drying furnace, it will carry some dust in the drying furnace. After being dust - removed by the dust removal device on the exhaust pipeline, it returns to the flue gas treatment pipeline.

[0011] As a preferred embodiment of the present utility model, the flue gas waste heat utilization device includes a flue gas treatment pipeline, on which a flue gas inlet, a dust collector, and an exhaust fan are provided. A main valve is provided on the pipeline between the flue gas inlet and the dust collector. The pipeline between the flue gas inlet and the main valve is communicated with an air inlet pipeline, on which an air inlet valve, a multi-tube dust removal device, and an air inlet fan are provided. The pipeline between the main valve and the dust collector is communicated with an exhaust pipeline, on which an exhaust valve is provided. In this solution, the flue gas in the flue gas treatment pipeline enters the air inlet pipeline without being treated by the dust collector. Therefore, a dust removal device is provided on the air inlet pipeline to remove dust from the introduced flue gas and then distribute it into each different dryer. After the flue gas comes out of the dryer, it returns to the flue gas treatment pipeline through the exhaust pipeline for subsequent dust collector treatment.

[0012] As a preferred embodiment of the present utility model, a multi-tube dust removal device or a gravity dust removal device is further provided on the exhaust pipeline. The dust removal device on the exhaust pipeline in this solution removes dust from the flue gas coming out of the dryer and then returns it to the flue gas treatment pipeline, which can reduce the dust removal pressure of the dust collector in the flue gas treatment pipeline.

[0013] As a preferred embodiment of the present utility model, the wet sludge feeding device includes an anti-arching bin, a plunger pump, a filter, and bifurcated pipelines corresponding to the first-stage dryers, which are connected to each other. Feed valves, buffer bins, screw pumps, and cloth spraying nozzles extending into the feed ports of the first-stage dryers are respectively provided on the bifurcated pipelines. In this solution, wet materials are added to the anti-arching bin and are respectively transported to two or more parallel pipelines through the plunger pump and the filter, and then through the valves to the buffer bins and the screw pumps. The cloth spraying nozzles respectively add the materials into multiple parallel first-stage dryers. The materials are dispersed and dried into pellets in the first-stage dryers. The dried materials are discharged from the discharge ports of the first-stage dryers and are conveyed to the feed port of the second-stage dryer by a discharge conveyor. The materials are dried into pellets in the second-stage dryer. The discharge port of the second-stage dryer is connected to a discharge conveyor. After the sludge is dried, it can be directly co-fired, or can be made into embryos or briquettes for resource utilization. The discharge port of the second-stage dryer can also be connected to the feed port of the third-stage dryer through a discharge conveyor. After being dried by the third-stage dryer, the sludge can be directly co-fired, or can be made into embryos or briquettes for resource utilization.

[0014] As a preferred embodiment of the present utility model, the wet sludge feeding device includes an arch-breaking bin, a metering feeding device, a filter, and a screw conveyor that are connected to each other. The screw conveyor is connected to the feeding port of the first-stage drying machine. In this embodiment, wet materials are added to the feeding bin, and are respectively conveyed to a plurality of parallel first-stage drying machines through the metering feeding device, the filter, and the screw conveyor. The materials are dispersed and dried into pellets in the first-stage drying machine. The dried materials are discharged from the discharge port of the first-stage drying machine and are conveyed to the feeding port of the second-stage drying machine through a discharge conveyor for further drying and pelletizing in the second-stage drying machine. The discharge port of the second-stage drying machine is connected to a discharge conveyor. After the sludge is dried, it can be directly co-fired, or can be made into embryos or briquettes for resource utilization. The discharge port of the second-stage drying machine can also be connected to the feeding port of the third-stage drying machine through a discharge conveyor. After being dried in the third-stage drying machine, the sludge can be directly co-fired, or can be made into embryos or briquettes for resource utilization.

[0015] As a preferred embodiment of the present utility model, air volume regulating valves are respectively provided at the connection ends of the air inlet pipe and the air outlet pipe with the drying machine. The air volume regulating valves in this embodiment can be used to separately adjust the flue gas flow rate into and out of each drying machine.

[0016] As a preferred embodiment of the present utility model, the cooling and conveying device includes a cooler, and the cooler is a rotary cooler or a belt cooler. When the sludge material is dried in the drying machine, due to the saturation of water vapor, when the water content of the sludge material drops to a certain amount, the water can no longer evaporate, but the temperature of the sludge material has increased. When the sludge material comes out of the drying machine and enters the cooler, during the conveying process in the cooler, the temperature of the sludge material is reduced by ventilation, and at the same time, part of the water vapor formed by the water in the sludge material can be released, further reducing the water content in the sludge material.

[0017] As a preferred embodiment of the present utility model, the drying machine is one or more combinations of a single-cylinder rotary kiln drying machine, a rotary belt drying machine, a double-cylinder rotary kiln drying machine, a belt drying machine, and a rotary dryer with a dispersing shaft. The drying machine in this embodiment can be a combination of the same type of drying machines or a combination of different types of drying machines, with strong adaptability.

[0018] As a preferred embodiment of the present utility model, the drying machine is a single-cylinder rotary kiln drying machine, and a chain dispersing area and a lifting plate pelletizing area are provided inside the single-cylinder rotary kiln drying machine, and a material striking device is provided outside the single-cylinder rotary kiln drying machine. The single-cylinder rotary kiln drying machine in this embodiment can break the materials into smaller particles, so that the water contained in the materials is more easily evaporated.

[0019] As a preferred solution of the present utility model, the drying machine is a belt dryer. A strip extruder or a cloth feeder is provided at the feeding port of the belt dryer. The discharging port of the belt dryer is connected to a discharging conveyor. One or more drying belts are provided inside the belt dryer. The drying belts inside the belt dryer in this solution can drive the materials to move back and forth inside the drying machine, prolong the drying time, and improve the drying efficiency.

[0020] As a preferred solution of the present utility model, the sludge drying and collection treatment device includes a briquetting device, and the briquetting device is used to briquette or pelletize the dried sludge for utilization. The briquetting device in this solution directly utilizes the dried sludge to make building materials and other objects, realizing the resource utilization of sludge.

[0021] As a preferred solution of the present utility model, the flue gas waste heat utilization device includes a flue gas inlet, a denitration device, a dust collector, a desulfurization device, a smoke exhaust fan, a wet electrostatic precipitator, and an exhaust device connected in sequence. After the waste heat of the flue gas in this solution is utilized by the drying machine, it can continue to be environmentally treated into clean gas and then discharged.

[0022] As a preferred solution of the present utility model, two or more groups of the hot gas source or flue gas waste heat utilization devices are provided, and each group of the hot gas source or flue gas waste heat utilization devices is respectively connected to a plurality of drying machines in a corresponding manner. In the case of a large number of drying machines used in groups, when the flue gas flow of one flue gas source is insufficient or the flue gas source needs to be overhauled, more flue gas sources can be introduced for use by the drying machines.

[0023] A method for low-temperature drying of sludge with waste heat of flue gas for optimized energy distribution includes a flue gas process and a material process. Multiple groups of dryers are used for drying the sludge. In the flue gas process, low-temperature flue gas is introduced from the flue gas treatment pipeline into the total inlet air pipeline. The low-temperature flue gas is distributed through the total inlet air pipeline and enters multiple groups of dryers respectively. After the drying process in multiple groups of dryers, the low-temperature flue gas enters the total exhaust air pipeline through air volume adjustment respectively. The total exhaust air pipeline discharges the low-temperature flue gas after the drying process back into the flue gas treatment pipeline. The low-temperature flue gas enters the total inlet air pipeline after dust removal treatment in the flue gas treatment pipeline, or the low-temperature flue gas returns to the flue gas treatment pipeline after dust removal treatment in the total inlet air pipeline and the total exhaust air pipeline. In the material process, multiple groups of dryers are divided into a first-stage drying unit group, a second-stage drying unit group or a first-stage drying unit group, a second-stage drying unit group, and a third-stage drying unit group. The material is sent into the first-stage drying unit group through a cloth spraying head or a screw conveyor respectively. After being dried in the first-stage drying unit group, the material is output to the first cooling conveyor belt. The material continues to be dried during the cooling and conveying process until it is conveyed to the second-stage drying unit group. After being dried again, it is output to the sludge drying and post-collection treatment device or output to the second cooling conveyor belt. The material output to the second cooling conveyor belt continues to be dried during the cooling and conveying process until it is conveyed to the third-stage drying unit group. After being dried by the third-stage drying unit group, it is output to the sludge drying and post-collection treatment device.

[0024] As a preferred solution of the present utility model, the low-temperature drying system of sludge with waste heat of flue gas adopts multiple parameter optimization controls. The parameters include the opening degree of the air valve, the rotation speed of the fan, the moving speed of the material in the dryer, the weight of the dry sludge, the image of the dry sludge, and the online moisture parameter of the dry sludge.

[0025] As a preferred embodiment of the present utility model, the low-temperature flue gas temperature is 110°C - 200°C. When the multiple dryers are divided into a first-stage dryer unit and a second-stage dryer unit, the material handling capacity is not less than 60 tons per day. When the multiple dryers are divided into a first-stage dryer unit, a second-stage dryer unit, and a third-stage dryer unit, the material handling capacity is not less than 150 tons per day. When batch-processing material drying, the commonly used dryer diameter is between 2 meters and 2.2 meters. When a single dryer or a series connection of single dryers is used for drying operations, the material handling capacity meeting the drying requirements is relatively low. The smaller the diameter of the dryer, the less the processing capacity. Although the processing capacity of a larger-diameter dryer will increase, the cost of the dryer will also increase, resulting in a relatively low cost performance. In this solution, multiple dryers of the previous stage are used to process the material and then convey it into a single dryer. For example, two first-stage dryers correspond to one second-stage dryer, and two second-stage dryers correspond to one third-stage dryer. When using dryers with a diameter between 2 meters and 2.2 meters, the material handling capacity with the combination of the first-stage dryer unit and the second-stage dryer unit is not less than 60 tons per day, and the material handling capacity with the combination of the first-stage dryer unit, the second-stage dryer unit, and the third-stage dryer unit is not less than 150 tons per day. After the low-temperature flue gas passes through the drying process of the dryer, through the adjustment of the air volume and the drying amount, the temperature drops by about 10 - 30°C, that is, from 110°C - 200°C to 100°C - 170°C.

[0026] Compared with the prior art, the beneficial effects of the present utility model are as follows: Through the setting of two or three levels of dryers before and after, the drying process of sludge materials and the like is carried out with optimized energy configuration distribution, improving the sludge drying effect and output, and reducing the adverse effects such as the easy moisture return and caking of the finished sludge and the high moisture content of the finished sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a dryer unit of the present utility model.

[0028] Figure 2 It is another structural schematic diagram of a dryer unit of the present utility model.

[0029] Figure 3 It is a structural schematic diagram of a flue gas waste heat utilization device of the present utility model.

[0030] Figure 4 It is another structural schematic diagram of a flue gas waste heat utilization device of the present utility model.

[0031] Figure 5 It is a structural schematic diagram of a wet sludge feeding device of the present utility model.

[0032] Figure 6 It is another structural schematic diagram of a wet sludge feeding device of the present utility model.

[0033] Figure 7 This is a structural schematic diagram of the device for collecting and treating sludge after drying in the utility model. Specific embodiments

[0034] To facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the utility model are given. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the utility model belongs. The terms used herein in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] Please refer to Figure 1-7 , the utility model provides the following technical solutions:

[0038] As Figure 1 shown, a flue gas waste heat low-temperature drying sludge system for optimizing energy distribution includes a sludge drying device and a wet sludge feeding device, a device for collecting and treating sludge after drying, and a hot gas source or a flue gas waste heat utilization device, which are respectively connected to the sludge drying device. The sludge drying device includes a plurality of dryers, and the dryers are two groups of primary dryers and one group of secondary dryers. The feeding ports of the two groups of primary dryers are respectively connected to the wet sludge feeding device, and the discharging ports of the two groups of primary dryers are both connected to the feeding port of the secondary dryer through a cooling and conveying device; the hot air inlets and exhaust outlets of the two groups of primary dryers and one group of secondary dryers are respectively connected to the hot gas source or the flue gas waste heat utilization device through an air inlet pipe and an exhaust pipe by respective pipelines; the discharging port of the secondary dryer is connected to the device for collecting and treating sludge after drying.

[0039] As Figure 2As shown in the figure, a flue gas waste heat low-temperature drying sludge system for distributed optimized energy configuration includes a sludge drying device, a wet sludge feeding device, a sludge collection and treatment device after drying, and a hot gas source or flue gas waste heat utilization device, all of which are connected to the sludge drying device. The sludge drying device includes multiple dryers, which are several pairs of primary dryers, several groups of secondary dryers corresponding to the paired primary dryers, and several groups of tertiary dryers corresponding to the paired secondary dryers. The feeding ports of several groups of primary dryers are respectively connected to the wet sludge feeding device. The discharge ports of two groups of primary dryers are both connected to the feeding ports of the corresponding secondary dryers through a cooling conveying device. The discharge ports of two groups of secondary dryers are both connected to the feeding ports of the corresponding tertiary dryers through a cooling conveying device. The hot air inlets and exhaust outlets of the primary dryers, secondary dryers, and tertiary dryers are respectively connected to the hot gas source or flue gas waste heat utilization device through air inlet pipes and exhaust pipes by their respective pipes. The discharge port of the tertiary dryer is connected to the sludge collection and treatment device after drying.

[0040] As Figure 1 、 Figure 2 shown in the figure, valves are respectively provided at the connection ends of the air inlet pipe and the exhaust pipe with the dryer, and the valves are air volume regulating valves.

[0041] As Figure 3 shown in the figure, the flue gas waste heat utilization device includes a flue gas treatment pipeline, on which a flue gas inlet, a dust collector, and an induced draft fan are provided. The flue gas inlet includes a boiler flue gas source and a denitration device. A main valve is provided on the pipeline between the dust collector and the induced draft fan. A desulfurization tower is provided between the induced draft fan and the main valve. The pipeline between the dust collector and the main valve is communicated with the air inlet pipe, and an air inlet valve and an air inlet fan are provided on the air inlet pipe. The pipeline between the main valve and the induced draft fan is communicated with the exhaust pipe, and an exhaust valve is provided on the exhaust pipe.

[0042] Particularly, a multi-tube dust removal device or a gravity dust removal device is also provided on the exhaust pipe.

[0043] As Figure 4 shown in the figure, the flue gas waste heat utilization device includes a flue gas treatment pipeline, on which a flue gas inlet, a dust collector, and an induced draft fan are provided. The flue gas inlet includes a boiler flue gas source and a denitration device. A main valve is provided on the pipeline between the denitration device and the dust collector. The pipeline between the denitration device and the main valve is communicated with the air inlet pipe, and an air inlet valve, a multi-tube dust removal device, and an air inlet fan are provided on the air inlet pipe. The pipeline between the main valve and the dust collector is communicated with the exhaust pipe, and an exhaust valve is provided on the exhaust pipe.

[0044] Particularly, a multi-tube dust removal device or a gravity dust removal device is also provided on the exhaust pipe.

[0045] As Figure 5As shown in the figure, the wet sludge feeding device includes an anti-arching silo, a plunger pump, a filter, and bifurcated pipes corresponding to the first-stage drying machines one by one. Feed valves, buffer silos, screw pumps, and cloth spray nozzles extending into the feed ports of the first-stage drying machines are respectively provided on the bifurcated pipes.

[0046] As Figure 6 shown in the figure, the wet sludge feeding device includes an anti-arching silo, a metering feeding device, a filter, and a screw conveyor, and the screw conveyor is connected to the feed port of the first-stage drying machine.

[0047] As Figure 1 、 Figure 2 shown in the figure, the cooling and conveying device includes a cooler, and the cooler is a rotary cooler or a belt cooler (cooling conveyor belt).

[0048] The drying machine is one or more of a single-cylinder rotary kiln drying machine, a rotary belt drying machine, a double-cylinder rotary kiln drying machine, a belt drying machine, and a single-shaft or double-shaft rotary dryer with a scattered shaft connected.

[0049] The drying machine is a single-cylinder rotary kiln drying machine. A chain scattering area and a material lifting plate granulation area are arranged inside the single-cylinder rotary kiln drying machine, and a material striking device is arranged outside the single-cylinder rotary kiln drying machine.

[0050] The drying machine is a belt drying machine. An extrusion bar machine or a cloth feeding machine is arranged at the feed port of the belt drying machine. The discharge port of the belt drying machine is connected to a discharge conveyor, and one or more drying belts are arranged inside the belt drying machine.

[0051] As Figure 7 shown in the figure, the sludge drying and post-treatment device includes a dry sludge conveyor, a sludge storage, and a sludge treatment device. The dry sludge conveyor is connected to the discharge port of the sludge drying device. When the dry sludge is used as a building material raw material, the sludge treatment device includes a blanking device, and the blanking device forms blanks or presses balls from the dried sludge for utilization.

[0052] As Figure 3 、 Figure 4 shown in the figure, the flue gas waste heat utilization device includes a flue gas inlet (boiler flue gas), a denitration device, a dust collector, a desulfurization device, a smoke exhaust fan, a wet electrostatic precipitator, and an exhaust device (chimney or exhaust stack) connected in sequence.

[0053] As Figure 2 shown in the figure, there are two or more groups of hot gas sources or flue gas waste heat utilization devices, and each group of hot gas sources or flue gas waste heat utilization devices is respectively connected to a plurality of drying machines.

[0054] The working process of the present utility model: The method for low-temperature drying of sludge by optimizing the energy configuration of distributed flue gas waste heat includes a flue gas process and a material process, and multiple groups of drying machines are used for drying the sludge;

[0055] In the flue gas flow process, low-temperature flue gas is introduced from the flue gas treatment pipeline into the main air inlet pipeline. The low-temperature flue gas is distributed through the main air inlet pipeline and enters multiple groups of dryers respectively. After passing through the drying process in the multiple groups of dryers, the low-temperature flue gas enters the main exhaust pipeline through air volume adjustment respectively. The main exhaust pipeline discharges the low-temperature flue gas after the drying process back into the flue gas treatment pipeline; the low-temperature flue gas enters the main air inlet pipeline after dust removal treatment in the flue gas treatment pipeline, or the low-temperature flue gas returns to the flue gas treatment pipeline after dust removal treatment in the main air inlet pipeline and the main exhaust pipeline;

[0056] In the material flow process, multiple groups of dryers are divided into a first-level drying unit group, a second-level drying unit group or a first-level drying unit group, a second-level drying unit group, and a third-level drying unit group. The materials are sent into the first-level drying unit group through a cloth spraying head or a screw conveyor respectively. After being dried in the first-level drying unit group, the materials are output to the first cooling conveyor belt. The materials continue to be dried during the cooling and conveying process until they are conveyed to the second-level drying unit group. After being dried again, the materials are output to the sludge drying and post-treatment device or output to the second cooling conveyor belt. The materials output to the second cooling conveyor belt continue to be dried during the cooling and conveying process until they are conveyed to the third-level drying unit group. After being dried by the third-level drying unit group, the materials are output to the sludge drying and post-treatment device.

[0057] The low-temperature drying sludge system using flue gas waste heat adopts intelligent control optimized by multiple parameters. The parameters include the opening degree of the air valve, the rotation speed of the fan, the moving speed of the materials in the dryer, the weight of the dry sludge, the image of the dry sludge, and the online moisture parameter of the dry sludge.

[0058] The temperature of the low-temperature flue gas is 110°C - 200°C. When multiple groups of dryers are divided into a first-level drying unit group and a second-level drying unit group, the material processing capacity is not less than 60 tons per day. When multiple groups of dryers are divided into a first-level drying unit group, a second-level drying unit group, and a third-level drying unit group, the material processing capacity is not less than 150 tons per day.

[0059] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flue gas waste heat low temperature sludge drying system with distributed optimized energy configuration, comprising a sludge drying device and a wet sludge feeding device, a sludge post-drying collection and processing device, and a hot air source or flue gas waste heat utilization device respectively connected to the sludge drying device, characterized in that: The sludge drying device comprises a plurality of dryers, wherein the dryers are two groups of primary dryers and one group of secondary dryers, the feed inlets of the two groups of primary dryers are respectively connected to the wet sludge feeding device, and the discharge ports of the two groups of primary dryers are connected to the feed inlet of the secondary dryer through the cooling and conveying device; The hot air inlets and exhaust outlets of the two groups of primary drying machines and one group of secondary drying machines are connected to the hot air source or the flue gas waste heat utilization device through the air inlet duct and the exhaust duct respectively through their own pipes; The discharge port of the secondary drying machine is connected to a sludge collection and processing device after drying.

2. A flue gas waste heat low temperature sludge drying system with distributed optimized energy configuration, comprising a sludge drying device and a wet sludge feeding device, a sludge post-drying collection and processing device, and a hot air source or flue gas waste heat utilization device respectively connected to the sludge drying device, characterized in that: The sludge drying device comprises a plurality of dryers, wherein the dryers are several groups of paired primary dryers, several groups of secondary dryers corresponding to the paired primary dryers, and several groups of tertiary dryers corresponding to the paired secondary dryers. The feed inlets of the several groups of primary dryers are respectively connected to the wet sludge feeding devices, the discharge ports of the two groups of primary dryers are connected to the feed inlets of the corresponding secondary dryers through cooling and conveying devices, and the discharge ports of the two groups of secondary dryers are connected to the feed inlets of the corresponding tertiary dryers through cooling and conveying devices. The hot air inlet and exhaust outlet of the first-stage drying machine, the second-stage drying machine and the third-stage drying machine are respectively connected to the hot air source or the flue gas waste heat utilization device through the air inlet duct and the exhaust duct through their own pipelines; The discharge port of the three-stage drying machine is connected to the sludge collection and treatment device after drying.

3. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The flue gas waste heat utilization device comprises a flue gas treatment pipeline, on which a flue gas inlet, a dust collector and a smoke exhaust fan are provided, a main valve is provided on the pipeline between the dust collector and the smoke exhaust fan, the pipeline between the dust collector and the main valve is connected to an air inlet pipeline, on which an air inlet valve and an air inlet fan are provided; the pipeline between the main valve and the smoke exhaust fan is connected to an exhaust pipeline, on which an exhaust valve is provided.

4. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 3 is characterized by: The exhaust duct is also provided with a multi-tube dust removal device or a gravity dust removal device.

5. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The flue gas waste heat utilization device comprises a flue gas treatment pipeline, on which a flue gas inlet, a dust collector and a smoke exhaust fan are provided, a main valve is provided on the pipeline between the flue gas inlet and the dust collector, the pipeline between the flue gas inlet and the main valve is connected to the air inlet pipeline, the air inlet pipeline is provided with an air inlet valve, a multi-tube dust removal device and an air inlet fan, the pipeline between the main valve and the dust collector is connected to the exhaust pipeline, and the exhaust pipeline is provided with an exhaust valve.

6. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 5 is characterized by: The exhaust duct is also provided with a multi-tube dust removal device or a gravity dust removal device.

7. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The wet sludge feeding device includes interconnected arch-breaking silos, plunger pumps, filters, and bifurcated pipes corresponding to the primary dryers one by one. The bifurcated pipes are respectively provided with feed valves, buffer silos, screw pumps, and material distribution nozzles extending into the feed port of the primary dryer.

8. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The wet sludge feeding device comprises an arch-breaking silo, a quantitative feeding device, a filter, and a screw conveyor which are connected to each other. The screw conveyor is connected to the feed port of the primary drying machine.

9. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The air inlet duct, the air exhaust duct and the connection end of the drying machine are respectively provided with an air volume regulating valve.

10. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The cooling and conveying device comprises a cooler, and the cooler is a rotary cooler or a belt cooler.

11. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The drying machine is one or more of a single-drum rotary kiln drying machine, a rotary mesh belt drying machine, a double-drum rotary kiln drying machine, a belt drying machine, and a breaking shaft rotary drying machine.

12. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The drying machine is a single-cylinder rotary kiln drying machine, the interior of which is provided with a chain breaking area and a material lifting plate granulating area, and the exterior of which is provided with a material striking device.

13. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The dryer is a belt dryer, the feed port of the belt dryer is provided with an extruder or a distributor, the discharge port of the belt dryer is connected to a discharge conveyor, and the belt dryer is provided with one or more drying belts.

14. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The device for collecting and processing the dried sludge comprises an embryo making device, and the embryo making device makes embryos or presses the dried sludge into balls for use.

15. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The flue gas waste heat utilization device comprises a flue gas inlet, a denitrification device, a dust collector, a desulfurization device, a smoke exhaust fan, a wet electrostatic precipitator, and an exhaust device which are connected in sequence.

16. The flue gas waste heat low temperature drying sludge system with distributed optimized energy configuration according to claim 1 or 2, characterized in that: The hot air source or flue gas waste heat utilization device is provided with two or more groups, and each group of hot air source or flue gas waste heat utilization device is respectively connected to a plurality of dryers.

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