Steam dewatering of sludge system

Abstract

The present application provides a kind of steam sludge drying system, it is related to sludge treatment drying technical field.The steam sludge drying system includes: drying device, including rotatable drying furnace, centrifugal force is generated by the rotation of drying furnace, and the sludge in drying furnace can be continuously thrown from the center of drying furnace to the wall of drying furnace, drying furnace has mud inlet and mud outlet, sludge enters drying furnace from mud inlet, and the sludge after drying is discharged from mud outlet;Steam delivery device is used to deliver steam to drying furnace through mud inlet to dry the sludge in drying furnace;Sludge feeding device is used to deliver sludge to drying furnace;Sludge discharging device is used to deliver the sludge after drying from mud outlet;Steam heat storage device is used to collect, store steam and provide steam to drying furnace through steam delivery device.The steam sludge drying system improves the drying efficiency of sludge, solves the problem of low efficiency of sludge drying by steam in the prior art.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and more specifically, to a steam drying sludge system. Background Technology

[0002] Currently, co-firing sludge into power plant boilers is an important measure. However, sludge typically has a high water content, and high-proportion co-firing inevitably affects the boiler's combustion stability. Therefore, minimizing the water content of the sludge is a problem that needs to be solved. Sludge is currently mainly dried using direct drying and steam drying technologies. Direct drying does not require the treatment of large amounts of wastewater and has good application prospects, but it consumes a lot of energy. Steam drying technology has advantages such as simple process, controllable degree of sludge drying, and powdered dried product. In existing technologies, sludge is dried by simultaneously stirring the sludge and introducing steam into the drying furnace. However, the steam can only contact the sludge on the surface, resulting in long drying time and low drying efficiency. Therefore, there is an urgent need for a device that can improve the efficiency of sludge drying. Summary of the Invention

[0003] The purpose of this invention is to provide a steam drying sludge system to solve the problem of low efficiency in steam drying sludge in the prior art.

[0004] To achieve the above objectives, the present invention provides a steam drying sludge system, the steam drying sludge system comprising:

[0005] The drying device includes a rotatable drying furnace. The rotation of the drying furnace generates centrifugal force, which can continuously throw the sludge inside the drying furnace from the center of the drying furnace to the furnace wall. The drying furnace has a sludge inlet and a sludge outlet. The sludge enters the drying furnace from the sludge inlet and the dried sludge is discharged from the sludge outlet.

[0006] A steam conveying device, connected to the mud inlet, is used to convey steam into the drying furnace through the mud inlet;

[0007] A sludge feeding device is installed at the sludge inlet for conveying sludge into the drying furnace;

[0008] A sludge discharge device is installed at the sludge outlet for conveying the dried sludge discharged from the sludge outlet.

[0009] A steam heat storage device is connected to the steam conveying device. The steam heat storage device is used to collect and store steam, and to supply steam to the drying furnace through the steam conveying device to dry the sludge in the drying furnace.

[0010] Specifically, the drying furnace has a cylindrical structure, the rotation center line of the drying furnace forms a first given angle with the horizontal plane, and the horizontal height of the mud inlet is higher than the horizontal height of the mud outlet.

[0011] Specifically, the drying device also includes multiple grinding blocks, which are movably arranged inside the drying furnace to grind the sludge as the drying furnace rotates and drives the sludge to rotate.

[0012] Specifically, the drying device also includes multiple heat storage blocks arranged circumferentially within the drying furnace to absorb and store the heat of the steam and to drive the multiple grinding blocks to rotate.

[0013] Specifically, the drying device further includes: multiple guide blocks, which are evenly distributed around the circumference of the drying furnace at the sludge outlet, for guiding the dried sludge to the sludge discharge device during the rotation of the drying furnace.

[0014] Specifically, the drying device also includes multiple humidity detectors installed at the sludge outlet inside the drying furnace to detect the humidity of the dried sludge.

[0015] Specifically, the steam drying sludge system also includes a steam circulation pipeline disposed between the sludge outlet and the sludge inlet, for recovering the steam discharged from the sludge outlet and sending the discharged steam back into the drying furnace through the sludge inlet.

[0016] Specifically, the steam drying sludge system further includes a cooling device for receiving the dried sludge conveyed by the sludge discharge device and cooling the dried sludge.

[0017] Specifically, the cooling device includes a cooling cylinder and a cooling drive;

[0018] The cooling cylinder is provided with a cooling channel. The cooling cylinder is used to receive the dried sludge conveyed by the sludge discharge device. The cooling medium conveyed into the cooling channel can cool the dried sludge entering the cooling cylinder.

[0019] The cooling actuator is used to drive the cooling cylinder to rotate.

[0020] Specifically, the cooling cylinder includes an inner sleeve and an outer sleeve, the outer sleeve is fitted onto the inner sleeve, a cooling cavity is formed between the outer sleeve and the inner sleeve, and the cooling flow channel is disposed in the cooling cavity.

[0021] The steam drying sludge system provided by this invention involves a steam storage device continuously supplying steam to the drying furnace through the sludge inlet via a steam conveying device. Sludge is fed into the drying furnace through the sludge feeding device. Under the centrifugal force generated by the rotation of the drying furnace, the sludge is continuously thrown against the furnace wall, allowing for better dispersion and contact with the steam, thus significantly improving the drying efficiency. The dried sludge is then discharged through a sludge discharge device, completing the sludge drying process. This steam drying sludge system improves sludge drying efficiency and solves the problem of low efficiency in existing steam drying sludge technologies.

[0022] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the layout structure of the steam drying sludge system provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the drying furnace in the steam drying sludge system provided by the present invention;

[0026] Figure 3 yes Figure 2 BB cross-sectional view of the drying furnace in the steam drying sludge system;

[0027] Figure 4 yes Figure 2 A cross-sectional view (AA) of the drying furnace in a steam-dried sludge system;

[0028] Figure 5 This is a CC-direction sectional view of the cooling cylinder of the cooling device in the steam drying sludge system provided by the present invention.

[0029] Explanation of reference numerals in the attached figures

[0030] 1-Drying furnace; 2-Steam conveying device; 3-Sludge feeding device; 4-Sludge discharge device; 5-Steam heat storage device; 6-Steam circulation pipeline; 7-Cooling device; 11-Grinding block; 12-Guide block; 13-Heat storage block; 21-Steam pipe; 71-Cooling cylinder; 710-Inner sleeve; 711-Outer sleeve. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0032] Figure 1 This is a schematic diagram of the layout and structure of a steam-dried sludge system. Figure 2 This is a schematic diagram of the drying furnace in a steam-dried sludge system. Figure 3 yes Figure 2 BB cross-sectional view of the drying furnace in the steam drying sludge system. Figure 4 yes Figure 2 A cross-sectional view (AA) of the drying furnace in a steam-dried sludge system. Figure 5 This is a CC-direction sectional view of the cooling cylinder of the cooling device in a steam-drying sludge system. (Example) Figures 1-5 As shown, the steam drying sludge system provided by the present invention includes:

[0033] The drying device includes a rotatable drying furnace 1. The rotation of the drying furnace 1 generates centrifugal force, which can continuously throw the sludge inside the drying furnace 1 from the center of the drying furnace 1 to the furnace wall of the drying furnace 1. The drying furnace 1 has a sludge inlet and a sludge outlet. The sludge enters the drying furnace 1 from the sludge inlet and the dried sludge is discharged from the sludge outlet.

[0034] Steam conveying device 2 is connected to the mud inlet and is used to convey steam into the drying furnace 1 through the mud inlet;

[0035] The sludge feeding device 3 is installed at the sludge inlet and is used to transport sludge into the drying furnace 1.

[0036] Sludge discharge device 4 is installed at the sludge outlet and is used to transport the dried sludge discharged from the sludge outlet.

[0037] A steam heat storage device 5 is connected to the steam conveying device 2. The steam heat storage device 5 is used to collect and store steam, and to supply steam to the drying furnace 1 through the steam conveying device 2 to dry the sludge in the drying furnace 1.

[0038] The steam drying sludge system provided by this invention includes a steam heat storage device 5 that continuously supplies steam to the drying furnace 1 via a steam conveying device 2, and a sludge feeding device 3 that conveys sludge into the drying furnace 1 through an inlet. During the rotation of the drying furnace 1, the sludge inside is continuously thrown against the furnace wall by the centrifugal force generated by the rotation of the drying furnace 1, which makes the sludge entering the drying furnace 1 more dispersed and thus allows for better contact with the steam, accelerating the drying speed of the sludge. After drying, the sludge is discharged through the outlet and then transported to a designated area by a sludge discharge device 4. The steam drying sludge system provided by this invention continuously throws the sludge from the center of rotation of the drying furnace 1 to the surrounding areas by the centrifugal force generated by the rotation of the drying furnace 1, increasing the contact area between the sludge and the steam, improving the sludge drying efficiency, and solving the problem of low efficiency in the existing technology of using steam to dry sludge.

[0039] In one embodiment, the drying furnace 1 has a cylindrical structure, the center line of rotation of the drying furnace 1 forms a first given angle with the horizontal plane, and the horizontal height of the mud inlet is higher than the horizontal height of the mud outlet. For example... Figure 2 As shown, the drying furnace 1 is inclined, with a first given angle between its rotation center line and the horizontal plane. This first given angle is set according to actual needs. To ensure the sludge can smoothly enter from the sludge inlet and move to the sludge outlet, the sludge inlet is higher than the sludge outlet, allowing the sludge to slowly flow to the outlet under the action of rotation and its own gravity. Figure 2 As shown, the steam conveying device 2 includes a steam pipe 21 with multiple steam ports. One end of the steam pipe 21 is connected to the steam heat storage device 5, and the other end extends into the drying furnace 1. The steam ports are located at the end of the steam pipe 21 that extends into the drying furnace 1. In order for the steam to better contact with the sludge to dry the sludge, the steam pipe 21 is located in the middle of the drying furnace 1. The steam provided by the steam heat storage device 5 is conveyed through the steam pipe 21 and sprayed into the drying furnace 1 from the multiple steam ports on the steam pipe 21. In order to improve energy utilization, the steam heat storage device 5 can be connected to the steam outlet of the steam turbine to store the steam generated by the steam turbine, thereby improving energy utilization.

[0040] To make the sludge finer, the drying device also includes multiple grinding blocks 11, which are movably arranged inside the drying furnace 1 to grind the sludge as the drying furnace 1 rotates and drives the sludge to rotate.

[0041] To prevent the steam fed into the drying furnace 1 from escaping through the sludge outlet and thus carrying away heat, the drying device also includes multiple heat storage blocks 13. These heat storage blocks 13 are arranged circumferentially within the drying furnace 1 to absorb and store the heat from the steam and to drive the rotation of the grinding blocks 1. The heat absorbed by the heat storage blocks 13 from the steam allows them to dry the sludge during contact with it, thereby accelerating the drying efficiency.

[0042] During the rotation of the drying furnace 1, multiple heat storage blocks 13 arranged along the inner circumference of the drying furnace 1 can not only absorb and store the heat in the steam, but also drive the grinding blocks 11 to rotate. Usually, the grinding blocks 11 are relatively heavy. During the rotation of the drying furnace 1, the heat storage blocks 13 can drive the grinding blocks 11 to the highest point in the furnace. Then, the grinding blocks 11 fall and hit the sludge in the furnace, which can break up large particles in the sludge. At the same time, as the multiple grinding blocks 11 rotate with the sludge in the furnace, the grinding blocks 11 continuously rub against the sludge in the furnace and other grinding blocks 11 to grind the sludge, making the sludge finer.

[0043] The drying device further includes a plurality of guide blocks 12, which are evenly distributed around the circumference of the drying furnace 1 at the sludge outlet inside the drying furnace 1, for guiding the dried sludge to the sludge discharge device 4 during the rotation of the drying furnace 1.

[0044] like Figure 4 The heat storage blocks 13 installed inside the drying furnace 1 quickly absorb and store the heat from the steam, preventing the steam discharged from the sludge outlet from carrying away the heat. The heat storage blocks 11, evenly distributed along the circumference of the inner wall of the drying furnace 1, also drive multiple grinding blocks 11 to rotate as the drying furnace 1 rotates. This causes the grinding blocks 11 to continuously rub against the sludge, grinding it to make it finer. After drying for a period of time, the sludge flows to the sludge outlet of the drying furnace 1. Under the centrifugal force generated by the rotation of the drying furnace 1, the sludge is thrown towards the furnace wall. In order to ensure that the dried sludge thrown towards the furnace wall of the drying furnace 1 can be smoothly fed into the sludge discharge device 4, multiple guide blocks 12 set at the sludge outlet of the drying furnace 1 guide all the sludge thrown towards the furnace wall of the drying furnace 1 into the sludge discharge device 4. Then, the dried sludge is discharged through the sludge discharge device 4. The sludge feeding device 3 and the sludge discharge device 4 can be shafted screw conveyors or shaftless screw conveyors.

[0045] To accurately determine the moisture content of the dried sludge and whether it meets the requirements, the drying device also includes multiple moisture detectors installed at the sludge outlet inside the drying furnace 1 to detect the moisture content of the dried sludge. By using the moisture detectors at the outlet, operators can accurately obtain the moisture content of the dried sludge, providing a reference for adjusting the temperature of the steam fed into the drying furnace 1.

[0046] To fully utilize energy, the steam drying sludge system also includes a steam circulation pipeline 6 installed between the sludge outlet and the sludge inlet. This pipeline recovers the steam discharged from the sludge outlet and reintroduces it into the drying furnace 1 via the sludge inlet. The steam circulation pipeline 6 allows the steam discharged from the sludge outlet to be reintroduced into the drying furnace 1 via the sludge inlet, preventing heat waste. A control valve can also be installed on the steam circulation pipeline 6 to control the flow rate of the steam reintroduced into the drying furnace 1.

[0047] In one embodiment, the sludge discharged by the sludge discharge device 4 is at a high temperature, which may cause spontaneous combustion and thus pose a danger. The steam drying sludge system further includes a cooling device 7, which is used to receive the dried sludge transported by the sludge discharge device 4 and cool the dried sludge.

[0048] The cooling device 7 includes a cooling cylinder 71 and a cooling driver;

[0049] The cooling cylinder 71 is provided with a cooling channel, and the cooling cylinder 71 is used to receive the dried sludge conveyed by the sludge discharge device 4; conveying a cooling medium into the cooling channel can cool the dried sludge entering the cooling cylinder 71.

[0050] The cooling driver is used to drive the cooling cylinder 71 to rotate.

[0051] The cooling cylinder 71 includes an inner sleeve 710 and an outer sleeve 711. The outer sleeve 711 is fitted onto the inner sleeve 710, and a cooling cavity is formed between the outer sleeve 711 and the inner sleeve 710. The cooling channel is disposed in the cooling cavity.

[0052] The dried sludge is fed into the cooling cylinder 71 through the sludge discharge device 4. The cooling cylinder 71 has a cooling inlet and a cooling outlet. The cooling cylinder 71 is inclined so that the cooling inlet is higher than the cooling outlet, so that the dried sludge can be discharged smoothly from the cooling outlet. The cooling cavity between the inner sleeve 710 and the outer sleeve 711 of the cooling cylinder 71 can be regarded as a cooling flow channel. A cooling medium, which can be a coolant, cooling oil, or cooling gas, is introduced into the cooling cavity. The cooling medium introduced into the cooling cavity exchanges heat with the dried sludge entering the cooling cylinder 71 to cool the dried sludge. The dried sludge is discharged from the cooling outlet of the cooling cylinder 71. The cooling drive drives the cooling cylinder 71 to rotate. The rotating cooling cylinder 71 causes the dried sludge to tumble inside the cooling cylinder 71, which can better facilitate heat exchange between the dried sludge and the cooling medium in the cooling cavity. Multiple stirring bars can also be evenly distributed on the inner wall of the cooling cylinder 71. When the cooling cylinder 71 rotates, the multiple stirring bars can carry the dried sludge to the highest point of the cooling cylinder 71, accelerating the cooling efficiency of the dried sludge.

[0053] In another embodiment, a cooling channel is arranged in the cooling cavity between the inner sleeve 710 and the outer sleeve 711. Multiple medium guide plates can be arranged in the cooling cavity. Each medium guide plate is simultaneously connected and fixed to the inner sleeve 710 and the outer sleeve 711. The cooling channel is separated in the cooling cavity by the multiple medium guide plates. The flow direction of the cooling medium is controlled by the cooling channel separated by the medium guide plates.

[0054] To determine whether the dried sludge has cooled to a suitable temperature, the cooling device 7 also includes a temperature detector, which is installed inside the cooling cylinder 71 to detect the temperature of the dried sludge inside the cooling cylinder 71. The temperature detector is located at the cooling outlet of the cooling cylinder 71.

[0055] The steam drying sludge system provided by this invention involves a steam storage device continuously supplying steam to the drying furnace through the sludge inlet via a steam conveying device. Sludge is fed into the drying furnace through the sludge feeding device. Under the centrifugal force generated by the rotation of the drying furnace, the sludge is continuously thrown against the furnace wall, allowing for better dispersion and contact with the steam, thus significantly improving the drying efficiency. The dried sludge is then discharged through a sludge discharge device, completing the sludge drying process. This steam drying sludge system improves sludge drying efficiency and solves the problem of low efficiency in existing steam drying sludge technologies.

[0056] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0057] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0058] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A steam-drying sludge system, characterized in that, The steam drying sludge system includes: The drying device includes a rotatable drying furnace (1). The rotation of the drying furnace (1) generates centrifugal force, which can continuously throw the sludge in the drying furnace (1) from the center of the drying furnace (1) to the furnace wall of the drying furnace (1). The drying furnace (1) has a sludge inlet and a sludge outlet. The sludge enters the drying furnace (1) from the sludge inlet and is discharged from the sludge outlet after drying. A steam conveying device (2) is connected to the mud inlet and is used to convey steam into the drying furnace (1) through the mud inlet; A sludge feeding device (3) is installed at the sludge inlet and is used to transport sludge into the drying furnace (1); A sludge discharge device (4) is installed at the sludge outlet and is used to transport the dried sludge discharged from the sludge outlet. A steam heat storage device (5) is connected to the steam conveying device (2). The steam heat storage device (5) is used to collect and store steam, and to supply steam to the drying furnace (1) through the steam conveying device (2) to dry the sludge in the drying furnace (1). Multiple grinding blocks (11) are movably arranged inside the drying furnace (1) for grinding the sludge during the process of the drying furnace (1) rotating and driving the sludge to rotate. Multiple guide blocks (12) are evenly distributed along the circumference of the drying furnace (1) at the sludge outlet inside the drying furnace (1) to guide the dried sludge to the sludge discharge device (4) during the rotation of the drying furnace (1). Cooling device (7) is used to receive the dried sludge conveyed by the sludge discharge device (4) and cool the dried sludge. The cooling device (7) includes a cooling cylinder (71) and a cooling drive. The cooling cylinder (71) is provided with a cooling channel. The cooling cylinder (71) is used to receive the dried sludge conveyed by the sludge discharge device (4). The cooling medium conveyed into the cooling channel can cool the dried sludge entering the cooling cylinder (71). The cooling driver is used to drive the cooling cylinder (71) to rotate; The cooling cylinder (71) includes an inner sleeve (710) and an outer sleeve (711). The outer sleeve (711) is fitted onto the inner sleeve (710). A cooling cavity is formed between the outer sleeve (711) and the inner sleeve (710). The cooling channel is disposed in the cooling cavity. Multiple medium guide plates are disposed in the cooling cavity. Each medium guide plate is fixed to both the inner sleeve (710) and the outer sleeve (711). The multiple medium guide plates separate the cooling channel in the cooling cavity to control the flow direction of the cooling medium.

2. The steam drying sludge system according to claim 1, characterized in that, The drying furnace (1) has a cylindrical structure. The rotation center line of the drying furnace (1) forms a first given angle with the horizontal plane. The horizontal height of the mud inlet is higher than the horizontal height of the mud outlet.

3. The steam drying sludge system according to claim 1, characterized in that, The drying device also includes multiple heat storage blocks (13), which are arranged circumferentially in the drying furnace (1) to absorb and store the heat of the steam and drive multiple grinding blocks (11) to rotate.

4. The steam drying sludge system according to claim 1, characterized in that, The drying device also includes multiple humidity detectors, which are installed at the sludge outlet inside the drying furnace (1) to detect the humidity of the dried sludge.

5. The steam drying sludge system according to claim 1, characterized in that, The steam drying sludge system also includes a steam circulation pipeline (6), which is set between the sludge outlet and the sludge inlet, for recovering the steam discharged from the sludge outlet and sending the discharged steam back into the drying furnace (1) through the sludge inlet.

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