CN222182057U - Sludge drying and dewatering treatment system - Google Patents

Abstract

The utility model discloses a sludge drying and drainage treatment system, including 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; 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 to be discharged, the feed port and the drain port are both located below the liquid level of the inner cavity of the pressure tank, the feed port is connected with the discharge port through a material guide pipeline, the drain port is connected with a discharge pipe downstream, and an electric control regulating valve is provided on the discharge pipe; the top of the pressure tank is provided with a steam exhaust port for steam to be discharged, and the steam exhaust port is connected with the steam inlet of the disc drying machine. The sludge drying and drainage treatment system can avoid steam leakage in the sludge drying treatment process, avoid energy waste and heat loss, improve the energy utilization rate in the sludge drying treatment process, and reduce the operating cost of related equipment accordingly.

Description

Sludge drying and dewatering treatment system

Technical Field

The utility model relates to the technical field of sludge innocent treatment technology and matched equipment thereof, in particular to a sludge drying and dewatering treatment system.

Background

In the general sewage treatment or other pollutant treatment processes, sludge is usually generated, the water content of the sludge is high, and can reach 60% -80%, so that the harmless treatment difficulty is high.

The main municipal sludge treatment modes at present comprise heat drying, high-pressure filter pressing and other modes. The sludge drying project cooperated with the garbage incineration plant usually adopts a heat drying mode, namely, the sludge is heated and dried by utilizing a steam heat source of the garbage incineration plant, so that the water content in the sludge is evaporated, the water content of the sludge is reduced, and steam generated after heat exchange is drained and returned into the garbage incineration plant. Common heat drying process types comprise thin layer drying, low-temperature belt drying, disc heat drying and the like, wherein the disc heat drying is the main flow process, and a disc dryer is adopted as core functional equipment, so that the method has the advantages of moderate investment and operation cost, high treatment capacity, low requirements on sludge properties, stable equipment operation, small operation and maintenance quantity and the like.

The disc drying is indirect drying, the steam pressure parameter used in the technical process is usually 0.5-0.8 MPa, and the generated water is discharged through a water drain valve group after indirect heat exchange with wet sludge. After the condensed water is discharged out of the drain valve group, the steam and condensed water mixture enters the drain valve group, and according to the working principle of the mechanical drain valve group, a thermosensitive assembly at the upper end of the drain valve group is heated and expanded due to the entering of high-temperature steam, so that a valve port is blocked.

After the high-temperature steam enters the mechanical drain valve, the heat-sensitive component is heated and expanded, so that the steam is blocked from being further discharged into the rear-end drain pipeline, in the process, the timeliness of the expansion action process of the heat-sensitive component is limited, and steam leakage is unavoidable, so that the steam heat is not fully utilized. Generally, after 0.5MPa steam is subjected to heat exchange by a disc dryer, the obtained hydrophobic temperature is about 110-120 ℃ and the hydrophobic pressure is 0.1-0.3 MPa. Accordingly, mechanical drain valves are usually operated intermittently, pressure fluctuations occur during intermittent start-up and shut-down operations, while the steam pressure used for disc drying is usually around 0.5MPa, the pressure is low, and when the pressure fluctuations cause the drain pressure to drop to a lower value, the drain cannot be directly conveyed into the deaerator of the incineration plant. Aiming at the working condition problems, the drainage is usually sent to a transfer container such as a water tank and the like in the industry, and then the drainage pump in the transfer container is sent to a downstream deaerator and other equipment to ensure that the drainage conveying pressure meets the working condition requirements of the deaerator and other equipment. Generally, in order to avoid cavitation of pumping equipment, heat exchange and cooling are performed on high-temperature hydrophobic water by using heat exchange equipment such as a hydrophobic heat exchanger, and then pumping operation is performed.

Accordingly, the hydrophobic heat exchanger generally exchanges heat between the hydrophobic water and the circulating cooling water, thereby reducing the temperature of the hydrophobic water and increasing the temperature of the cooling water. This results in insufficient utilization of the heat carried by the high temperature drain, and therefore waste of heat. In addition, the circulating cooling water can be conveyed into the cooling tower after heat exchange and temperature rise, and after cooling treatment by the mechanical ventilation cooling tower, the circulating cooling water can be used for heat exchange with the drainage water again, so that the circulating use of the cooling water is realized, the burden of the cooling tower is increased, the further energy waste in the system operation process is caused, the whole energy utilization rate of the sludge drying treatment system is restricted, and the system operation cost is increased.

In view of this, how to avoid steam leakage during sludge drying treatment, avoid energy waste and heat loss, improve the energy utilization rate during sludge drying treatment, and enable the running cost of related equipment to be correspondingly reduced is an important technical problem that needs to be solved at present by those skilled in the art.

Disclosure of utility model

The utility model aims to provide a sludge drying hydrophobic treatment system which can avoid steam leakage in the sludge drying treatment process, avoid energy waste and heat loss, improve the energy utilization rate in the sludge drying treatment process and correspondingly reduce the operation cost of related equipment.

In order to solve the technical problems, the utility model provides a sludge drying and dewatering treatment system, which comprises 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 steam outlet for dewatering and discharging steam;

The pressure tank is provided with a feed port for steam to drain and flow into the inner cavity of the pressure tank and a drain port for drain and flow out of the inner cavity of the pressure tank, the feed port and the drain port are both positioned below the liquid level of the inner cavity of the pressure tank, the feed port and the drain port are communicated through a material guide pipeline, the downstream of the drain port is communicated with a material discharge pipe, and the material discharge pipe is provided with an electric control regulating valve;

The top of the pressure tank is provided with a steam outlet for discharging steam, and the steam outlet is communicated with a steam inlet of the disc drier.

Preferably, the pressure tank comprises a liquid level monitoring section and a material guiding section which are arranged from top to bottom and are communicated, the liquid level of the inner cavity of the pressure tank is positioned in the liquid level monitoring section, and the feeding port and the water draining port are both positioned in the material guiding section.

Preferably, a liquid level meter in communication fit with the electric control regulating valve is arranged on the pressure tank.

Preferably, the hydrophobic port is higher than the feed port.

Preferably, an early warning buffer gap is arranged between the bottom end of the liquid level monitoring section and the feeding port along the vertical direction.

Preferably, the steam generator further comprises a steam supply pipeline and a steam return pipeline, wherein the inlet end of the steam supply pipeline is communicated with an external steam source, and the outlet end of the steam supply pipeline is communicated with the steam inlet;

The inlet end of the steam return pipeline is communicated with the steam outlet, and the outlet end of the steam return pipeline is communicated with the steam supply pipeline.

Compared with the background art, in the working and running process of the sludge drying and dewatering treatment system provided by the utility model, high-temperature steam sent by the upstream steam supply equipment or other steam sources enters the steam cavity of the disc dryer through the steam inlet so as to exchange heat with sludge in the sludge cavity of the disc dryer, so that liquid mixed in the sludge is evaporated, and drying treatment of the sludge is realized. The steam in the steam cavity of the disc drier after heat exchange is moderately cooled, so that drainage is generated, the drainage is liquid, but still has higher temperature, and part of high-temperature steam still remains in a steam state after heat exchange is completed. And the steam mixed in the steam cavity and the drainage water are discharged from the steam cavity together through the discharge port and sequentially introduced into the pressure tank through the material guide pipeline and the feed port, after reaching the pressure tank, the steam mixed in the steam drainage mixture flows back to the steam inlet through the steam discharge port and enters the steam cavity of the disc dryer again through the steam inlet so as to keep the constant pressure state of the pressure tank, the backflow steam can participate in the next heat exchange process, and the drainage water in the pressure tank is discharged from the pressure tank through the drainage port so as to send the drainage water into downstream related matched equipment such as a downstream deaerator and the like, so that the treatment requirement of the downstream subsequent process is met. During the period, the opening degree of the electric control regulating valve is regulated to flexibly regulate the water drainage amount stored in the pressure tank, and the electric control regulating valve can be directly closed when necessary, so that the liquid level in the pressure tank is always higher than the water drainage port, thereby forming a water seal for the water drainage port, avoiding the steam in the pressure tank leaking into a downstream pipeline through the water drainage port, effectively avoiding the steam flow and the heat energy waste, and the steam flowing back into the disc drying machine through the steam outlet and the steam inlet can be re-participated in the next heat exchange process, fully utilizing the heat energy of the steam at the separation position in the pressure tank, greatly improving the overall energy utilization rate of the system, and the steam flowing back into the disc drying machine can still keep higher temperature, and can participate in the heat exchange process of the disc drying machine, so that the operation cost of the disc drying machine can be correspondingly reduced. In addition, the gas loop formed after the steam outlet is communicated with the steam inlet is utilized, so that the gas environments of a disc drier, a pressure tank and related pipelines in the sludge drying and dewatering treatment system are communicated, the stability and sufficiency of the internal gas pressure of the system are effectively ensured, the dewatering pressure discharged to equipment such as a downstream deaerator and the like through the water outlet and the steam outlet pipe is higher, the working condition requirements of the downstream deaerator and other matched equipment can be met, the smooth conveying and flow guiding of the dewatering can be ensured without additionally providing pumping equipment, and the equipment such as a cooling tower which is specially matched for meeting the working condition temperature requirements of the pumping equipment in the prior art is also not required to be additionally arranged, thereby further simplifying the number of matched equipment of the sludge drying and dewatering treatment system, greatly reducing the overall operation cost of the sludge drying and dewatering treatment system, and improving the dewatering conveying efficiency and the system operation efficiency.

In another preferred scheme of the utility model, the pressure tank comprises a liquid level monitoring section and a material guiding section which are arranged from top to bottom and are communicated, the liquid level of the inner cavity of the pressure tank is positioned in the liquid level monitoring section, and the water drain port is positioned in the material guiding section. The arrangement is convenient for a worker to monitor and observe the liquid level of the inner cavity of the pressure tank in real time, so that the opening degree and the opening and closing state of the electric control regulating valve can be quickly regulated according to the liquid level height state in the inner cavity of the pressure tank in time, the liquid level of the inner cavity of the pressure tank is kept generally stable, the drain port is always under the liquid level of the inner cavity of the pressure tank, the water sealing effect of the drain port in the pressure tank is ensured, and steam leakage through the drain port is avoided.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a layout structure diagram of a sludge drying and dewatering treatment system according to an embodiment of the present utility model.

Wherein:

11-disc drier, 111-steam inlet, 112-discharge outlet;

12-pressure tank, 121-feed inlet, 122-drain outlet, 123-exhaust outlet, 124-liquid level monitoring section and 125-guide section;

13-a material guide pipeline;

14-discharge pipe 141-electric control regulating valve;

15-a liquid level gauge;

16-a steam supply line;

17-a steam return line;

21-a steam source;

22-deaerator.

Detailed Description

The utility model aims to provide a sludge drying hydrophobic treatment system which can avoid steam leakage in the sludge drying treatment process, avoid energy waste and heat loss, improve the energy utilization rate in the sludge drying treatment process and correspondingly reduce the operation cost of related equipment.

In order to better understand the aspects of the present utility model, the present utility model will be described in further detail with reference to the accompanying drawings and detailed description.

It should be noted that, in the present utility model, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, either fixedly connected or detachably connected or integrally connected, either directly or indirectly connected through an intermediate medium, and also include communication between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, in the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact through additional features therebetween.

In addition, the first feature being "above," "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. The terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

Please refer to fig. 1 in combination.

In a specific embodiment, the sludge drying and dewatering treatment system provided by the utility model comprises a disc dryer 11 and a pressure tank 12, wherein the disc dryer 11 is provided with a steam inlet 111 for steam to enter and a discharge outlet 112 for dewatering and discharging steam;

The pressure tank 12 is provided with a feed inlet 121 for steam to drain and flow into the inner cavity of the pressure tank 12 and a drain outlet 122 for drain and discharge in the inner cavity of the pressure tank 12, the drain outlet 122 is positioned below the liquid level in the inner cavity of the pressure tank 12, the feed inlet 121 and the drain outlet 112 are communicated through a material guide pipeline 13, the downstream of the drain outlet 122 is communicated with a material discharge pipe 14, and the material discharge pipe 14 is provided with an electric control regulating valve 141;

The top of the pressure tank 12 is provided with a steam outlet 123 for discharging steam, and the steam outlet 123 is communicated with the steam inlet 111 of the disc dryer 11.

In a specific working operation process, high-temperature steam sent by an upstream steam supply device or other steam sources 21 enters the steam cavity of the disc dryer 11 through the steam inlet 111 so as to exchange heat with sludge in the sludge cavity of the disc dryer 11, so that liquid mixed in the sludge is evaporated, and drying treatment of the sludge is realized.

The steam in the steam chamber of the disc dryer 11 after the heat exchange is properly cooled, so that water is generated, and the water is still in a liquid state but still has a higher temperature, and a part of high-temperature steam still remains in a steam state after the heat exchange is completed and only has a reduced temperature. The steam mixed in the steam cavity and the drain water are discharged from the steam cavity together through the discharge port 112 and sequentially introduced into the pressure tank 12 through the material guide pipeline 13 and the feed port 121, after reaching the pressure tank 12, the steam mixed in the steam-drain mixture flows back to the steam inlet 111 through the steam outlet 123 and enters the steam cavity of the disc dryer 11 again through the steam inlet 111 so as to participate in the next heat exchange process, and the drain water in the pressure tank 12 is discharged from the pressure tank 12 through the drain port 122 so as to send the drain water into downstream related matched equipment such as the downstream deaerator 22 and the like so as to meet the treatment requirements of downstream subsequent processes. During the period, the opening degree of the electric control regulating valve 141 is adjusted to flexibly regulate the drain amount stored in the pressure tank 12, and the electric control regulating valve 141 can be directly closed when necessary, so that the liquid level in the pressure tank 12 is always higher than the drain port 122, thereby forming a water seal for the drain port 122, avoiding the steam in the pressure tank 12 leaking into a downstream pipeline through the drain port 122, effectively avoiding the steam flow and heat energy waste, and the steam flowing back into the disc dryer 11 through the steam outlet 123 and the steam inlet 111 can be re-participated in the next heat exchange process, fully utilizing the heat energy of the steam separated in the pressure tank 12, greatly improving the overall energy utilization rate of the system, and the steam flowing back into the disc dryer 11 still maintains higher temperature, and can participate in the heat exchange process of the disc dryer 11, so that the operation cost is correspondingly reduced.

In addition, the gas loop formed after the steam outlet 123 is communicated with the steam inlet 111 is utilized, so that the disc drier 11, the pressure tank 12 and the gas environment of related pipelines in the sludge drying and dewatering treatment system are communicated, the stability and sufficiency of the internal gas pressure of the system are effectively ensured, thereby, the dewatering pressure discharged to the downstream deaerator 22 and other equipment through the water outlet 122 and the discharge pipe 14 is higher, the working condition requirements of the downstream deaerator 22 and other matched equipment can be met, the smooth conveying and the diversion of the dewatering can be ensured without additionally providing pumping equipment, and the equipment which can cool down the dewatering in order to meet the working condition temperature requirements of the pumping equipment such as a cooling tower and the like in the prior art is also not additionally arranged, so that the number of the matched equipment of the sludge drying and dewatering treatment system is further reduced, the integral operation cost of the sludge drying and dewatering treatment system is greatly reduced, and the dewatering conveying efficiency and the system operation efficiency are improved.

In practical application, the disc dryer 11 may be replaced by another type of dryer. It should be noted that the dryer selected should be able to meet the conditions of the application of high temperature steam and match the operational requirements of the corresponding pressure tank 12 and other associated equipment to ensure smooth operation of the sludge drying and dewatering treatment system.

Specifically, the pressure tank 12 includes a liquid level monitoring section 124 and a material guiding section 125, which are arranged from top to bottom and are communicated, the liquid level in the inner cavity of the pressure tank 12 is located in the liquid level monitoring section, and the drain port 122 is located in the material guiding section 125. The arrangement is convenient for a worker to monitor and observe the liquid level in the inner cavity of the pressure tank 12 in real time, so that the opening degree and the opening and closing state of the electric control regulating valve 141 can be quickly regulated according to the liquid level height state in the inner cavity of the pressure tank 12 in time, the liquid level in the inner cavity of the pressure tank 12 is kept generally stable, the drain port 122 is always kept below the liquid level in the inner cavity of the pressure tank 12, the water sealing effect of the drain port 122 in the pressure tank 12 is further ensured, and steam leakage through the drain port 122 is avoided.

On the basis, a liquid level meter 15 in communication with an electrically controlled regulating valve 141 is arranged on the pressure tank 12. The liquid level meter 15 can monitor the liquid level position in the inner cavity of the pressure tank 12 in real time, and feed back a control signal to the electric control regulating valve 141 accordingly, so as to adjust the opening of the electric control regulating valve 141, thereby correspondingly adjusting the water drain amount discharged from the water drain port 122, and controlling the electric control regulating valve 141 to be directly closed or re-opened when necessary.

Specifically, when the liquid level meter 15 monitors that the liquid level in the inner cavity of the pressure tank 12 gradually decreases from the ideal liquid level, the liquid level meter 15 feeds back a signal to the electric control regulating valve 141 to control the opening degree of the electric control regulating valve 141 to shrink, thereby reducing the drain flow discharged through the drain port 122 until the liquid level in the inner cavity of the pressure tank 12 is restored to the ideal position state, when the liquid level meter 15 monitors that the page in the inner cavity of the pressure tank 12 gradually increases from the ideal liquid level, the liquid level meter 15 feeds back a signal to the electric control regulating valve 141 to control the opening degree of the electric control regulating valve 141 to increase the drain flow discharged through the drain port 122 until the liquid level in the inner cavity of the pressure tank 12 is restored to the ideal position state, when the liquid level meter 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 working condition reasonable liquid level position, the liquid level meter 15 feeds back a signal to the electric control regulating valve 141 to control the electric control regulating valve 141 to be directly closed, thereby temporarily stopping the drain to the outside through the drain port 122, so that the liquid level in the inner cavity of the pressure tank 12 can be quickly restored to the reasonable liquid level range, and after the liquid level in the inner cavity of the pressure tank 12 is restored to the reasonable liquid level range, the liquid level meter is restored to the liquid level is controlled to the reasonable, and the liquid level meter 141 is controlled to be opened again, so that the opening degree is stable.

It should be noted that the reasonable liquid level range is usually a liquid level height interval, and the ideal liquid level is usually a central position of the reasonable liquid level range. Considering the adaptation application requirements under most working conditions, the lower limit of the reasonable liquid level range is usually 500mm above the top edge of the drain port 122, and of course, the size can be flexibly selected and adjusted according to the pressure tank 12 with different size specifications and different practical application conditions. In principle, the sludge drying and hydrophobic treatment system can meet the practical application requirements of the sludge drying and hydrophobic treatment system.

In addition, it should be noted that, in general, the assembly height of the disc dryer 11 should be higher than that of the pressure tank 12, so that smooth conveying and guiding of the steam drainage in the material guiding pipeline 13 can be completed by utilizing the gravity of the steam drainage, and efficient conveying of the steam drainage between the material outlet 112 and the material inlet 121 is ensured. Of course, in practical application, if the layout space of the device is limited or the working condition is not allowed, only the discharge port 112 may be ensured to be higher than the feed port 121. If the actual working conditions cannot be met for the above-mentioned equipment layout, pumping equipment can be arranged on the material guiding pipeline 13 to ensure that the steam hydrophobic energy can be smoothly conveyed from the material discharging port 112 to the material feeding port 121.

Of course, the steam drainage conveying mode between the disc dryer 11 and the pressure tank 12 is not limited to the above, and in practical application, a worker can flexibly select and adjust the structural layout and the adapting mode of each related device according to specific working conditions and operation requirements, and in principle, the steam drainage conveying mode can meet the practical application requirements of the sludge drying drainage treatment system.

On the other hand, the feed port 121 is located within the guide section 125. The feeding port 121 is correspondingly arranged in the material guiding section 125, so that the feeding port 121 is always below the liquid level of the inner cavity of the pressure tank 12, and water seal is formed on the feeding port 121 and the water drain port 122 by utilizing water drain in the inner cavity of the pressure tank 12, so that steam in the pressure tank 12 can be prevented from leaking into a downstream pipeline through the water drain port 122, and steam in the pressure tank 12 can be prevented from flowing back into the material guiding pipeline 13 through the feeding port 121, and stable and smooth operation of the pressure tank 12 and related matched pipelines can be further ensured.

Further, the drain port 122 is higher than the feed port 121. The arrangement is such that the drain water introduced into the pressure tank 12 via the feed port 121 can be moderately buffered and stabilized in the bottom space of the inner cavity of the pressure tank 12 to ensure a smoother and smoother drain water flow state discharged via the drain port 122, and the drain water discharge efficiency is correspondingly improved.

More specifically, an early warning buffer gap is provided between the bottom end of the liquid level monitoring section 124 and the feed port 121 in the vertical direction. The early warning buffer clearance can ensure that when the liquid level in the inner cavity of the pressure tank 12 rapidly drops, enough reaction time is given to the liquid level meter 15 to feed back signals so as to control the electric control regulating valve 141 to implement corresponding opening degree regulation and opening and closing control, and corresponding remedy and regulation measures can be implemented for staff so as to avoid abnormal operation of the pressure tank 12 and related equipment and ensure stable and efficient operation of the pressure tank 12.

Referring to the description of the reasonable liquid level range of the inner cavity of the pressure tank 12, for the general working condition requirement, the pre-warning buffer gap can be correspondingly set to be 500mm, and other dimension specifications can be selected according to specific working condition and application requirement. In principle, it is sufficient if the smooth operation of the pressure tank 12 and its associated equipment is ensured and the operational requirements of the sludge drying and dewatering system are met.

In addition, the sludge drying and dewatering treatment system further comprises a steam supply pipeline 16 and a steam return pipeline 17, wherein the inlet end of the steam supply pipeline 16 is communicated with an external steam source 21, and the outlet end of the steam supply pipeline 16 is communicated with a steam inlet 111. The steam provided by the external steam source 21 can be smoothly and efficiently introduced into the steam cavity of the disc dryer 11 through the air inlet through the steam supply pipeline 16, and the smooth operation of the disc dryer 11 is ensured.

The inlet end of the steam return line 17 is connected to the steam outlet 123, and the outlet end of the steam return line 17 is connected to the steam supply line 16. The outlet end of the steam return pipeline 17 is communicated with the steam supply pipeline 16, so that the steam discharged from the pressure tank 12 through the steam discharge port 123 can be combined with the high-temperature steam sent from the external steam source 21 in the steam supply pipeline 16, the energy utilization rate is further improved, and the overall operation cost of the sludge drying and dewatering treatment system is further reduced.

In summary, in the sludge drying and dewatering treatment system provided by the utility model, high-temperature steam sent by the upstream steam supply equipment or other steam sources enters the steam cavity of the disc dryer through the steam inlet so as to exchange heat with sludge in the sludge cavity of the disc dryer, so that liquid mixed in the sludge is evaporated, and drying treatment of the sludge is realized. The steam in the steam cavity of the disc drier after heat exchange is moderately cooled, so that drainage is generated, the drainage is liquid, but still has higher temperature, and part of high-temperature steam still remains in a steam state after heat exchange is completed. And the steam mixed in the steam cavity and the drainage water are discharged from the steam cavity together through the discharge port and sequentially introduced into the pressure tank through the material guide pipeline and the feed port, after reaching the pressure tank, the steam mixed in the steam drainage mixture flows back to the steam inlet through the steam discharge port and enters the steam cavity of the disc dryer again through the steam inlet so as to keep the constant pressure state of the pressure tank, the backflow steam can participate in the next heat exchange process, and the drainage water in the pressure tank is discharged from the pressure tank through the drainage port so as to send the drainage water into downstream related matched equipment such as a downstream deaerator and the like, so that the treatment requirement of the downstream subsequent process is met. During the period, the opening degree of the electric control regulating valve is regulated to flexibly regulate the water drainage amount stored in the pressure tank, and the electric control regulating valve can be directly closed when necessary, so that the liquid level in the pressure tank is always higher than the water drainage port, thereby forming a water seal for the water drainage port, avoiding the steam in the pressure tank leaking into a downstream pipeline through the water drainage port, effectively avoiding the steam flow and the heat energy waste, and the steam flowing back into the disc drying machine through the steam outlet and the steam inlet can be re-participated in the next heat exchange process, fully utilizing the heat energy of the steam at the separation position in the pressure tank, greatly improving the overall energy utilization rate of the system, and the steam flowing back into the disc drying machine can still keep higher temperature, and can participate in the heat exchange process of the disc drying machine, so that the operation cost of the disc drying machine can be correspondingly reduced. In addition, the gas loop formed after the steam outlet is communicated with the steam inlet is utilized, so that the gas environments of a disc drier, a pressure tank and related pipelines in the sludge drying and dewatering treatment system are communicated, the stability and sufficiency of the internal gas pressure of the system are effectively ensured, the dewatering pressure discharged to equipment such as a downstream deaerator and the like through the water outlet and the steam outlet pipe is higher, the working condition requirements of the downstream deaerator and other matched equipment can be met, the smooth conveying and flow guiding of the dewatering can be ensured without additionally providing pumping equipment, and the equipment such as a cooling tower which is specially matched for meeting the working condition temperature requirements of the pumping equipment in the prior art is also not required to be additionally arranged, thereby further simplifying the number of matched equipment of the sludge drying and dewatering treatment system, greatly reducing the overall operation cost of the sludge drying and dewatering treatment system, and improving the dewatering conveying efficiency and the system operation efficiency.

The sludge drying and dewatering treatment system provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (7)

1. The sludge drying and dewatering treatment system is characterized by 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 dewatering and discharging steam;

The pressure tank is provided with a feed port for leading steam into the inner cavity of the pressure tank in a drainage way and a drainage port for discharging the steam from the inner cavity of the pressure tank, the drainage port is positioned below the liquid level of the inner cavity of the pressure tank, the feed port is communicated with the discharge port through a material guide pipeline, the downstream of the drainage port is communicated with 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 outlet for discharging steam, and the steam outlet is communicated with a steam inlet of the disc drier.

2. The sludge drying and dewatering treatment system of claim 1, wherein the pressure tank comprises a liquid level monitoring section and a material guiding section which are arranged from top to bottom and are communicated, the liquid level of the inner cavity of the pressure tank is positioned in the liquid level monitoring section, and the dewatering opening is positioned in the material guiding section.

3. The sludge drying and dewatering treatment system according to claim 2, wherein a liquid level meter in communication with the electrically controlled regulating valve is arranged on the pressure tank.

4. The sludge drying hydrophobic treatment system of claim 2, wherein said feed inlet is located within said guide section.

5. The sludge drying hydrophobic treatment system of claim 4, wherein said hydrophobic mouth is higher than said feed mouth.

6. The sludge drying hydrophobic treatment system of claim 5, wherein an early warning buffer gap is provided between the bottom end of the liquid level monitoring section and the feed inlet in a vertical direction.

7. The sludge drying hydrophobic treatment system of claim 1, further comprising a steam supply line and a steam return line, an inlet end of the steam supply line being in communication with an external steam source, an outlet end of the steam supply line being in communication with the steam inlet;

The inlet end of the steam return pipeline is communicated with the steam outlet, and the outlet end of the steam return pipeline is communicated with the steam supply pipeline.