Sludge drying hydrophobic treatment system

Abstract

The utility model discloses a sludge drying and dewatering treatment system which comprises a disc drying machine and a pressure tank, and the disc drying machine is provided with a steam inlet for introducing steam and a discharge port for discharging steam dewatering; the pressure tank is provided with a feeding port allowing steam drain water to be introduced into an inner cavity of the pressure tank and a drain port allowing drain water in the inner cavity of the pressure tank to be discharged, the feeding port and the drain port are both located below the liquid level of the inner cavity of the pressure tank, the feeding port is communicated with the discharging port through a material guiding pipeline, and the downstream of the drain port is communicated with a discharging pipe. An electric control regulating valve is arranged on the discharge pipe; the top of the pressure tank is provided with a steam exhaust port for exhausting steam, and the steam exhaust port is communicated with a steam inlet of the disc drying machine. According to the sludge drying and dewatering treatment system, steam leakage in the sludge drying treatment process can be avoided, energy waste and heat loss are avoided, the energy utilization rate in the sludge drying treatment process is increased, and the operation cost of related equipment is correspondingly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge harmless treatment technology and its supporting equipment, in particular to a sludge drying and drainage treatment system. Background Art

[0002] In the process of general sewage treatment or other pollutant treatment, sludge is usually produced. The water content of this kind of sludge is relatively high, usually reaching 60% to 80%, which makes it difficult to treat it harmlessly.

[0003] The current mainstream methods of municipal sludge disposal include thermal drying, high-pressure filter pressing, etc. Among them, sludge drying projects that cooperate with waste incineration plants usually adopt the form of thermal drying, that is, the steam heat source of the waste incineration plant is used to heat and dry the sludge, thereby evaporating the water in the sludge to reduce the water content of the sludge. The steam generated after heat exchange is then sent back to the waste incineration plant. Common thermal drying process types include thin layer drying, low-temperature belt drying, disc thermal drying, etc. Among them, disc thermal drying is the mainstream process. It uses a disc dryer as the core functional equipment, with the advantages of moderate investment and operation costs, large processing capacity, low requirements for sludge properties, stable equipment operation, and low operation and maintenance.

[0004] Disc drying is indirect drying. The steam pressure parameter used in the process is usually 0.5-0.8MPa. After indirect heat exchange with wet sludge, the generated water is discharged through the steam trap group. After the condensed water is discharged from the steam trap group, the mixture of steam and condensed water enters the steam trap group. According to the working principle of the mechanical steam trap group, the thermal sensitive component at the top of the steam trap group expands due to the entry of high-temperature steam, thereby blocking the valve port.

[0005] Among them, after the high-temperature steam enters the mechanical steam trap, the thermal component expands due to the heat, thereby blocking the steam from being further discharged into the rear-end steam trap pipe. In this process, due to the timeliness of the expansion action process of the thermal component, steam leakage is inevitable, resulting in incomplete utilization of steam heat. Generally, after 0.5MPa steam passes through the disc dryer for heat exchange, the obtained steam trap temperature is about 110-120℃, and the steam trap pressure is 0.1-0.3MPa. Correspondingly, the mechanical steam trap is usually operated intermittently, and pressure fluctuations will occur during its intermittent start-stop operation. The steam pressure used for disc drying is usually around 0.5MPa, which is relatively low. When the pressure fluctuation causes the steam trap pressure to drop to a lower value, the steam trap cannot be directly transported to the deaerator of the incineration plant. At present, for such working conditions, the industry usually first sends the steam trap to a transfer container such as a water tank, and then pumps the steam trap in the transfer container to the downstream deaerator and other equipment to ensure that the steam trap delivery pressure meets the working conditions of the deaerator and other equipment. Generally, in order to avoid cavitation in pumping equipment, it is necessary to use heat exchange equipment such as a drain heat exchanger to cool down the high-temperature drain before performing pumping operations.

[0006] Correspondingly, the drain heat exchanger usually exchanges heat with the circulating cooling water, thereby reducing the temperature of the drain and increasing the temperature of the cooling water. This will result in the heat carried by the high-temperature drain not being fully utilized, thus causing heat waste. In addition, the circulating cooling water will be transported to the cooling tower after the heat exchange and temperature rise. After the mechanical ventilation cooling tower is cooled, the circulating cooling water will be used again for heat exchange with the drain, thereby realizing the recycling of cooling water. This not only increases the burden on the cooling tower, but also causes further energy waste during the operation of the system, restricting the overall energy utilization of the sludge drying treatment system and increasing the system operation cost.

[0007] In view of this, how to avoid steam leakage during the sludge drying process, avoid energy waste and heat loss, improve energy utilization during the sludge drying process, and reduce the operating costs of related equipment accordingly is an important technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0008] The purpose of the utility model is to provide a sludge drying and drainage treatment system, which can avoid steam leakage in the sludge drying process, avoid energy waste and heat loss, improve the energy utilization rate in the sludge drying process, and reduce the operating costs of related equipment accordingly.

[0009] In order to solve the above technical problems, the utility model provides a sludge drying and drainage treatment system, comprising a disc drying machine and a pressure tank, wherein the disc drying machine is provided with a steam inlet for steam to enter and a discharge port for steam drainage to be discharged;

[0010] The pressure tank is provided with a feed port for steam drainage to enter the inner cavity of the pressure tank and a drain port for drainage in the inner cavity of the pressure tank, the feed port and the drain port are both located below the liquid level in the inner cavity of the pressure tank, the feed port is connected with the discharge port through a material guide pipeline, the downstream of the drain port is connected with a discharge pipe, and the discharge pipe is provided with an electric control regulating valve;

[0011] The top of the pressure tank is provided with a steam exhaust port for steam exhaust, and the steam exhaust port is communicated with the steam inlet of the disc dryer.

[0012] Preferably, the pressure tank comprises a liquid level monitoring section and a material guiding section which are arranged and connected from top to bottom, the liquid level in the inner cavity of the pressure tank is within the liquid level monitoring section, and the feed port and the drain port are both located within the material guiding section.

[0013] Preferably, the pressure tank is provided with a liquid level gauge which communicates with the electronically controlled regulating valve.

[0014] Preferably, the hydrophobic port is higher than the feed port.

[0015] Preferably, an early warning buffer gap is provided between the bottom end of the liquid level monitoring section and the feed port in the vertical direction.

[0016] Preferably, it further comprises a steam supply pipeline and a steam return pipeline, wherein the inlet end of the steam supply pipeline is connected to an external steam source, and the outlet end of the steam supply pipeline is connected to the steam inlet;

[0017] The inlet end of the steam return pipeline is connected to the steam exhaust port, and the outlet end of the steam return pipeline is connected to the steam supply pipeline.

[0018] Compared with the above background technology, the sludge drying and drainage treatment system provided by the utility model, during its operation, the high-temperature steam sent by the upstream steam supply equipment or other steam source enters the steam chamber of the disc dryer through the steam inlet, so as to exchange heat with the sludge in the sludge chamber of the disc dryer, so as to evaporate the liquid mixed in the sludge, thereby achieving the drying treatment of the sludge. The steam in the steam chamber of the disc dryer after the heat exchange is properly cooled down to generate drainage, which is in liquid state but still has a relatively high temperature. At the same time, a part of the high-temperature steam will remain in the steam state after the heat exchange is completed. Afterwards, the steam and drain mixed together in the steam chamber are discharged from the steam chamber through the discharge port, and are successively passed into the pressure tank through the material guide pipe and the feed port. After reaching the pressure tank, the steam mixed in the steam-drain mixture will flow back to the steam inlet through the steam discharge port, and enter the steam chamber of the disc dryer again through the steam inlet, so as to maintain the constant pressure state of the pressure tank, and the reflux steam can participate in the next heat exchange process; and the drain in the pressure tank is discharged from the pressure tank through the drain port, so as to be sent to the downstream deaerator and other downstream related supporting equipment to meet the downstream subsequent process processing requirements. During this period, the amount of drain in the pressure tank can be flexibly adjusted by adjusting the opening of the electronically controlled regulating valve, and the electronically controlled regulating valve can be directly closed when necessary, so as to control the liquid level in the pressure tank to always be higher than the drain port, thereby forming a water seal for the drain port, preventing the steam in the pressure tank from leaking into the downstream pipeline through the drain port, thereby effectively avoiding steam loss and heat energy waste, and the steam flowing back to the disc dryer through the exhaust port and the steam inlet can re-participate in the next heat exchange process, making full use of the thermal energy of the steam at the separation point in the pressure tank, greatly improving the overall energy utilization rate of the system, and this part of the steam flowing back to the disc dryer still maintains a relatively high temperature, and can participate in the heat exchange process of the disc dryer, so that its operating cost can be reduced accordingly. In addition, by utilizing the gas loop formed by connecting the exhaust port with the steam inlet, the gas environment of the disc dryer, pressure tank and related pipelines in the sludge drying and draining treatment system is connected, effectively ensuring the stability and sufficiency of the internal air pressure of the system, so that the drain pressure discharged to the downstream deaerator and other equipment through the drain port and the discharge pipe is relatively high, which can meet the working condition requirements of the downstream deaerator and other supporting equipment, thereby ensuring the smooth transportation and diversion of the drain without the need for additional pumping equipment. In the prior art, there is no need to arrange cooling towers and other equipment that can cool the drain to meet the working temperature requirements of the pumping equipment. This further reduces the number of supporting equipment of the sludge drying and draining treatment system, greatly reduces the overall operating cost of the sludge drying and draining treatment system, and improves the drain transportation efficiency and system operation efficiency.

[0019] In another preferred embodiment of the utility model, the pressure tank includes a liquid level monitoring section and a material guiding section arranged from top to bottom and connected, the liquid level of the pressure tank cavity is in the liquid level monitoring section, and the drain port is located in the material guiding section. Such an arrangement facilitates the staff to monitor and observe the liquid level of the pressure tank cavity in real time, so as to promptly adjust the opening and opening and closing state of the electric control regulating valve according to the liquid level height state in the pressure tank cavity, so that the liquid level of the pressure tank cavity remains generally stable, thereby ensuring that the drain port is always below the liquid level of the pressure tank cavity, thereby ensuring the water sealing effect at the drain port in the pressure tank, and preventing steam from leaking through the drain port. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a layout diagram of a sludge drying and drainage treatment system provided in a specific implementation manner of the utility model.

[0022] in:

[0023] 11-disc dryer; 111-steam inlet; 112-discharge port;

[0024] 12-pressure tank; 121-feeding port; 122-draining port; 123-exhaust port; 124-liquid level monitoring section; 125-feeding section;

[0025] 13- material guide pipeline;

[0026] 14-discharge pipe; 141-electrically controlled regulating valve;

[0027] 15-Liquid level gauge;

[0028] 16-steam supply pipeline;

[0029] 17-steam return line;

[0030] 21- Steam source;

[0031] 22-Deaerator. DETAILED DESCRIPTION

[0032] The core of the utility model is to provide a sludge drying and drainage treatment system, which can avoid steam leakage in the sludge drying process, avoid energy waste and heat loss, improve the energy utilization rate in the sludge drying process, and reduce the operating costs of related equipment accordingly.

[0033] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, in the present invention, unless otherwise clearly stipulated and limited, a first feature “on” or “under” a second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature therebetween.

[0036] In addition, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] Please refer to Figure 1 .

[0038] In a specific embodiment, the sludge drying and drainage treatment system provided by the utility model comprises a disc drying machine 11 and a pressure tank 12, and the disc drying machine 11 is provided with a steam inlet 111 for steam to enter and a discharge port 112 for steam drainage to be discharged;

[0039] The pressure tank 12 is provided with a feed port 121 for steam drainage to enter the inner cavity of the pressure tank 12 and a drain port 122 for draining the drainage in the inner cavity of the pressure tank 12. The drain port 122 is located below the liquid level in the inner cavity of the pressure tank 12. The feed port 121 is connected to the discharge port 112 through a material guide pipeline 13. The downstream of the drain port 122 is connected to a discharge pipe 14, and the discharge pipe 14 is provided with an electric control regulating valve 141.

[0040] The top of the pressure tank 12 is provided with a steam exhaust port 123 for exhausting steam, and the steam exhaust port 123 is connected to the steam inlet 111 of the disc dryer 11 .

[0041] During the specific operation process, the high-temperature steam sent from the upstream steam supply equipment or other steam source 21 enters the steam chamber of the disc dryer 11 through the steam inlet 111, so as to exchange heat with the sludge in the sludge chamber of the disc dryer 11, so as to evaporate the liquid mixed in the sludge, thereby achieving the drying treatment of the sludge.

[0042] After the heat exchange is completed in the steam chamber of the disc dryer 11, the steam is cooled appropriately to generate hydrophobicity. Although these hydrophobicity are in liquid state, they still have a relatively high temperature. At the same time, a part of the high-temperature steam will remain in the steam state after the heat exchange is completed, but only the temperature will be reduced. After that, the steam and hydrophobicity mixed in the steam chamber are discharged from the steam chamber through the discharge port 112, and are successively passed into the pressure tank 12 through the guide pipe 13 and the feed port 121. After reaching the pressure tank 12, the steam mixed in the steam-hydrophobic mixture will flow back to the steam inlet 111 through the exhaust port 123, and enter the steam chamber of the disc dryer 11 again through the steam inlet 111 to participate in the next heat exchange process; and the hydrophobicity in the pressure tank 12 is discharged from the pressure tank 12 through the hydrophobicity port 122, so as to send the hydrophobicity to the downstream deaerator 22 and other downstream related supporting equipment to meet the downstream subsequent process processing requirements. During this period, the amount of drain stored in the pressure tank 12 is flexibly adjusted by adjusting the opening of the electronically controlled regulating valve 141, and the electronically controlled regulating valve 141 can be directly closed when necessary, so as to control the liquid level in the pressure tank 12 to always be higher than the drain port 122, thereby forming a water seal for the drain port 122, and preventing the steam in the pressure tank 12 from leaking into the downstream pipeline through the drain port 122, thereby effectively avoiding steam loss and heat energy waste, and the steam that flows back to the disc dryer 11 through the exhaust port 123 and the steam inlet 111 can re-participate in the next heat exchange process, making full use of the thermal energy of the steam at the separation point in the pressure tank 12, greatly improving the overall energy utilization rate of the system, and this part of the steam flowing back to the disc dryer 11 still maintains a relatively high temperature, and can participate in the heat exchange process of the disc dryer 11, so that its operating cost can be reduced accordingly.

[0043] In addition, by utilizing the gas loop formed by connecting the exhaust port 123 with the steam inlet 111, the gas environment of the disc dryer 11, the pressure tank 12 and related pipelines in the sludge drying and draining treatment system is connected, effectively ensuring the stability and sufficiency of the internal air pressure of the system, so that the drain pressure discharged to the downstream deaerator 22 and other equipment through the drain port 122 and the discharge pipe 14 is relatively high, which can meet the working condition requirements of the downstream deaerator 22 and other supporting equipment, thereby ensuring the smooth transportation and diversion of the drain without the need for additional pumping equipment. In the prior art, there is no need to arrange cooling towers and other equipment that can cool the drain to meet the working temperature requirements of the pumping equipment. This further simplifies the number of supporting equipment for the sludge drying and draining treatment system, greatly reduces the overall operating cost of the sludge drying and draining treatment system, and improves the drain transportation efficiency and system operation efficiency.

[0044] It should be noted that, in actual applications, the disc dryer 11 can also be replaced by other types of dryers. However, it should be noted that the selected dryer should be able to meet the application conditions of high-temperature steam and match the operating requirements of the corresponding pressure tank 12 and other supporting equipment to ensure the smooth operation of the sludge drying and drainage treatment system.

[0045] Specifically, the pressure tank 12 includes a liquid level monitoring section 124 and a material guiding section 125 arranged from top to bottom and connected, the liquid level of the inner cavity of the pressure tank 12 is in the liquid level monitoring section, and the drain port 122 is located in the material guiding section 125. Such an arrangement facilitates the staff to monitor and observe the liquid level of the inner cavity of the pressure tank 12 in real time, so as to promptly adjust the opening and opening and closing state of the electric control regulating valve 141 according to the liquid level height state in the inner cavity of the pressure tank 12, so that the liquid level of the inner cavity of the pressure tank 12 remains substantially stable, thereby ensuring that the drain port 122 is always below the liquid level of the inner cavity of the pressure tank 12, thereby ensuring the water sealing effect at the drain port 122 in the pressure tank 12, and preventing steam from leaking through the drain port 122.

[0046] On this basis, the pressure tank 12 is provided with a liquid level gauge 15 that communicates with the electric control valve 141. The liquid level gauge 15 can monitor the liquid level in the inner cavity of the pressure tank 12 in real time, and accordingly feed back a control signal to the electric control valve 141, thereby adjusting the opening of the electric control valve 141, thereby correspondingly adjusting the amount of drainage discharged from the drainage port 122, and can control the electric control valve 141 to directly close or reopen when necessary.

[0047] Specifically, when the liquid level gauge 15 detects that the liquid level in the inner cavity of the pressure tank 12 gradually decreases from the ideal liquid level, the liquid level gauge 15 feeds back a signal to the electronically controlled regulating valve 141 to control the opening of the electronically controlled regulating valve 141 to reduce, thereby reducing the drain flow discharged through the drain port 122 until the liquid level in the inner cavity of the pressure tank 12 returns to the ideal position state; if the liquid level gauge 15 detects that the liquid level in the inner cavity of the pressure tank 12 gradually rises from the ideal liquid level, the liquid level gauge 15 feeds back a signal to the electronically controlled regulating valve 141 to control the opening of the electronically controlled regulating valve 141 to increase, thereby increasing the drain flow discharged through the drain port 122 until the liquid level in the inner cavity of the pressure tank 12 returns to the ideal position state. The liquid level in the cavity returns to an ideal position; if the liquid level gauge 15 detects that the liquid level in the inner cavity of the pressure tank 12 is close to or reaches the lower limit of the preset reasonable liquid level position under the working conditions, the liquid level gauge 15 feeds back a signal to the electronically controlled regulating valve 141 to control the electronically controlled regulating valve 141 to close directly, thereby temporarily stopping the discharge of drain water outward through the drain port 122, so that the liquid level in the inner cavity of the pressure tank 12 can be quickly restored to a reasonable liquid level range. After the liquid level in the inner cavity of the pressure tank 12 returns to a reasonable liquid level range, the liquid level gauge 15 feeds back a signal to the electronically controlled regulating valve 141 to control the electronically controlled regulating valve 141 to reopen and operate stably with an appropriate opening.

[0048] It should be noted that the above-mentioned reasonable liquid level range is usually a liquid level height interval, and the ideal liquid level is usually the center position of the above-mentioned reasonable liquid level range. Taking into account the application requirements under most working conditions, the lower limit of the above-mentioned reasonable liquid level range is usually 500mm above the top edge of the drain port 122. Of course, this size can be flexibly selected and adjusted with reference to different sizes of pressure tanks 12 and actual application conditions. In principle, as long as it can meet the actual application needs of the sludge drying and draining treatment system.

[0049] In addition, it should be noted that, in general, the assembly height of the disc dryer 11 should be higher than the assembly height of the pressure tank 12, so that the steam trap can be smoothly transported and guided in the material guide pipe 13 by utilizing the gravity of the steam trap itself, and the efficient transportation of the steam trap between the discharge port 112 and the feed port 121 is ensured. Of course, in actual applications, if the equipment layout space is limited or the working conditions do not allow, it is also possible to only ensure that the discharge port 112 is higher than the feed port 121. If the actual working conditions cannot meet the above equipment layout, a pumping device can be arranged on the material guide pipe 13 to ensure that the steam trap can be smoothly transported from the discharge port 112 to the feed port 121.

[0050] Of course, the steam drainage transportation method between the disc dryer 11 and the pressure tank 12 is not limited to the above description. In actual application, the staff can flexibly select and adjust the structural layout and adaptation method of each related equipment according to the specific working conditions and operation requirements. In principle, as long as it can meet the actual application needs of the sludge drying and drainage treatment system, it can be used.

[0051] On the other hand, the feed port 121 is located in the material guide section 125. The feed port 121 is also arranged in the material guide section 125, which can ensure that the feed port 121 is always below the liquid level in the inner cavity of the pressure tank 12, so that the hydrophobicity in the inner cavity of the pressure tank 12 forms a water seal for the feed port 121 and the hydrophobicity 122 at the same time, thereby not only preventing the steam in the pressure tank 12 from leaking into the downstream pipeline through the hydrophobicity 122, but also preventing the steam in the pressure tank 12 from flowing back into the material guide pipeline 13 through the feed port 121, thereby further ensuring the smooth operation of the pressure tank 12 and its related supporting pipelines.

[0052] Furthermore, the drain port 122 is higher than the feed port 121. With such an arrangement, the drain entering the pressure tank 12 through the feed port 121 can be appropriately buffered and stabilized in the bottom space of the inner cavity of the pressure tank 12, so as to ensure that the drain discharged through the drain port 122 flows more smoothly and the drain discharge efficiency is correspondingly improved.

[0053] More specifically, there is an early warning buffer gap between the bottom end of the liquid level monitoring section 124 and the feed port 121 in the vertical direction. The early warning buffer gap can ensure that when the liquid level in the inner cavity of the pressure tank 12 drops rapidly, the liquid level meter 15 is given enough reaction time to feedback the signal so as to control the electronically controlled regulating valve 141 to implement corresponding opening adjustment and opening and closing control, and can also implement corresponding remedial and adjustment measures for the staff to avoid abnormal operation of the pressure tank 12 and its related equipment, and ensure the smooth and efficient operation of the pressure tank 12.

[0054] Referring to the description of the reasonable liquid level range of the inner cavity of the pressure tank 12 in the previous text, for general working conditions, the above-mentioned warning buffer gap can be set to 500mm, and other size specifications can also be selected according to specific working conditions and application requirements. In principle, as long as it can ensure the smooth operation of the pressure tank 12 and its related equipment and meet the working needs of the sludge drying and drainage treatment system.

[0055] In addition, the sludge drying and drainage treatment system also includes a steam supply pipeline 16 and a steam return pipeline 17. The inlet end of the steam supply pipeline 16 is connected to the external steam source 21, and the outlet end of the steam supply pipeline 16 is connected to the steam inlet 111. The steam supply pipeline 16 can ensure that the steam provided by the external steam source 21 can smoothly and efficiently pass into the steam chamber of the disc dryer 11 through the air inlet, thereby ensuring the smooth operation of the disc dryer 11.

[0056] The inlet end of the steam return pipe 17 is connected to the exhaust port 123, and the outlet end of the steam return pipe 17 is connected to the steam supply pipe 16. By connecting the outlet end of the steam return pipe 17 to the steam supply pipe 16, the steam discharged from the pressure tank 12 through the exhaust port 123 can first be combined with the high-temperature steam sent from the external steam source 21 in the steam supply pipe 16, thereby further improving the energy utilization rate and further reducing the overall operating cost of the sludge drying and drainage treatment system.

[0057] In summary, in the sludge drying and drainage treatment system provided in the utility model, during its operation, the high-temperature steam sent from the upstream steam supply device or other steam source enters the steam chamber of the disc dryer through the steam inlet, so as to exchange heat with the sludge in the sludge chamber of the disc dryer, so as to evaporate the liquid mixed in the sludge, thereby achieving the drying treatment of the sludge. The steam in the steam chamber of the disc dryer after the heat exchange is properly cooled down to generate drainage, which is in liquid state but still has a relatively high temperature, and a part of the high-temperature steam will remain in the steam state after the heat exchange is completed. Afterwards, the steam and drain mixed together in the steam chamber are discharged from the steam chamber through the discharge port, and are successively passed into the pressure tank through the material guide pipe and the feed port. After reaching the pressure tank, the steam mixed in the steam-drain mixture will flow back to the steam inlet through the steam discharge port, and enter the steam chamber of the disc dryer again through the steam inlet, so as to maintain the constant pressure state of the pressure tank, and the reflux steam can participate in the next heat exchange process; and the drain in the pressure tank is discharged from the pressure tank through the drain port, so as to be sent to the downstream deaerator and other downstream related supporting equipment to meet the downstream subsequent process processing requirements. During this period, the amount of drain in the pressure tank can be flexibly adjusted by adjusting the opening of the electronically controlled regulating valve, and the electronically controlled regulating valve can be directly closed when necessary, so as to control the liquid level in the pressure tank to always be higher than the drain port, thereby forming a water seal for the drain port, preventing the steam in the pressure tank from leaking into the downstream pipeline through the drain port, thereby effectively avoiding steam loss and heat energy waste, and the steam flowing back to the disc dryer through the exhaust port and the steam inlet can re-participate in the next heat exchange process, making full use of the thermal energy of the steam at the separation point in the pressure tank, greatly improving the overall energy utilization rate of the system, and this part of the steam flowing back to the disc dryer still maintains a relatively high temperature, and can participate in the heat exchange process of the disc dryer, so that its operating cost can be reduced accordingly. In addition, by utilizing the gas loop formed by connecting the exhaust port with the steam inlet, the gas environment of the disc dryer, pressure tank and related pipelines in the sludge drying and draining treatment system is connected, effectively ensuring the stability and sufficiency of the internal air pressure of the system, so that the drain pressure discharged to the downstream deaerator and other equipment through the drain port and the discharge pipe is relatively high, which can meet the working condition requirements of the downstream deaerator and other supporting equipment, thereby ensuring the smooth transportation and diversion of the drain without the need for additional pumping equipment. In the prior art, there is no need to arrange cooling towers and other equipment that can cool the drain to meet the working temperature requirements of the pumping equipment. This further reduces the number of supporting equipment of the sludge drying and draining treatment system, greatly reduces the overall operating cost of the sludge drying and draining treatment system, and improves the drain transportation efficiency and system operation efficiency.

[0058] The above is a detailed introduction to the sludge drying and drainage treatment system provided by the utility model. This article uses specific examples to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A sludge drying and drainage treatment system, characterized in that: It comprises a disc dryer and a pressure tank, wherein the disc dryer is provided with a steam inlet for steam to enter and a discharge port for steam to drain; The pressure tank is provided with a feed port for steam drainage to enter the inner cavity of the pressure tank and a drain port for drainage in the inner cavity of the pressure tank, the drain port is located below the liquid level in the inner cavity of the pressure tank, the feed port is connected to the discharge port through a material guide pipeline, the downstream of the drain port is connected to a discharge pipe, and the discharge pipe is provided with an electric control regulating valve; The top of the pressure tank is provided with a steam exhaust port for steam exhaust, and the steam exhaust port is communicated with the steam inlet of the disc dryer.

2. The sludge drying and drainage treatment system according to claim 1, characterized in that: The pressure tank comprises a liquid level monitoring section and a material guiding section which are arranged and connected from top to bottom. The liquid level of the inner cavity of the pressure tank is located in the liquid level monitoring section, and the drain port is located in the material guiding section.

3. The sludge drying and drainage treatment system according to claim 2, characterized in that: The pressure tank is provided with a liquid level meter which communicates with the electronically controlled regulating valve.

4. The sludge drying and drainage treatment system according to claim 2, characterized in that: The feed inlet is located in the material guiding section.

5. The sludge drying and drainage treatment system according to claim 4, characterized in that: The hydrophobic port is higher than the feed port.

6. The sludge drying and drainage treatment system according to claim 5, characterized in that: An early warning buffer gap is provided between the bottom end of the liquid level monitoring section and the feed port in the vertical direction.

7. The sludge drying and drainage treatment system according to claim 1, characterized in that: It also includes a steam supply pipeline and a steam return pipeline, wherein the inlet end of the steam supply pipeline is connected to an external steam source, and the outlet end of the steam supply pipeline is connected to the steam inlet; The inlet end of the steam return pipeline is connected to the steam exhaust port, and the outlet end of the steam return pipeline is connected to the steam supply pipeline.

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