Cooling and discharging system for sludge heat drying device

Abstract

The utility model relates to the technical field of cooling after sludge heat drying, and provides a cooling and discharging system for a sludge heat drying device. The system mainly comprises a cooling chamber, a screw conveyer and a sludge drying chamber, and the cooling chamber is directly communicated with the sludge heat drying device and is connected with the sludge drying chamber through the screw conveyer. The cooling chamber is provided with an inert gas supply system, a first sealing valve and a second sealing valve, the first sealing valve is arranged between the sludge heat drying device and the cooling chamber, and the second sealing valve is arranged between the cooling chamber and the screw conveyor. According to the system, inert gas is adopted for cooling, so that the temperature of the dried sludge is effectively reduced, and dust explosion is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of post-cooling of sludge thermal drying, in particular to a cooling and discharging system for a sludge thermal drying device. Background Art

[0002] Sludge treatment is a critical component of modern wastewater treatment and solid waste management. With increasingly stringent environmental regulations and a growing emphasis on resource recycling, sludge thermal drying has become a key technology in sludge treatment, as it significantly reduces sludge volume, kills pathogens, and stabilizes organic matter.

[0003] Sludge thermal drying equipment typically uses high-temperature steam or thermal oil as a heat source, using indirect heating to further dry the initially dehydrated sludge (moisture content approximately 60%), further reducing the moisture content to approximately 30%. This process not only reduces the volume and weight of the sludge but also facilitates subsequent storage, transportation, and resource utilization. However, the dried sludge is relatively hot (approximately 90°C) upon discharge and contains a high amount of organic matter, posing a risk of dust explosion during cooling and discharge.

[0004] To ensure the safety of the dried sludge and facilitate its subsequent storage, transportation, and resource utilization, the dried sludge discharged from the sludge thermal drying unit must be cooled in a sealed manner. The cooling process must avoid using traditional water spraying or air cooling methods, which can cause the sludge to absorb moisture. This is because water spraying increases the moisture content of the sludge, while air cooling may introduce oxygen, increasing the risk of dust explosions.

[0005] Therefore, there is an urgent need to develop a cooling and discharging system that can effectively cool the dried sludge, keep it dry, and prevent dust explosions. Utility Model Content

[0006] The purpose of the utility model is to address the deficiencies of the prior art and provide a cooling and discharging system for a sludge thermal drying device, which uses inert gas to cool the dried sludge. The entire process is sealed to avoid dust explosions. In addition, the inert gas is recycled to achieve efficient, safe, and environmentally friendly cooling and discharging of the sludge, providing reliable technical support for subsequent treatment and resource utilization of the sludge.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A cooling and discharging system for a sludge thermal drying device comprises a cooling chamber, a screw conveyor and a dried sludge bin; the cooling chamber is connected to the sludge thermal drying device; the screw conveyor connects the cooling chamber and the dried sludge bin; and the cooling chamber is connected to an inert gas supply system; the cooling chamber is provided with a first sealing valve, a second sealing valve, an inert gas inlet and an inert gas outlet; the first sealing valve is provided between the sludge thermal drying device and the cooling chamber, and the second sealing valve is provided between the cooling chamber and the screw conveyor.

[0009] Preferably, the inert gas supply system includes a dust removal device, an air cooler, and a circulating fan, which are connected in series in sequence. The dust removal device is connected to the inert gas outlet, and the circulating fan is connected to the inert gas inlet.

[0010] Preferably, the inert gas supply system further comprises an inert gas buffer tank connected between the circulating fan and the inert gas inlet, and the inert gas buffer tank is provided with an inert gas replenishment port and an ash discharge port.

[0011] Preferably, a first check valve and a first control valve are sequentially provided between the dust removal device and the inert gas outlet, and a second check valve and a second control valve are sequentially provided between the inert gas buffer tank and the inert gas inlet.

[0012] Preferably, the dust removal device includes a primary dust collector and a secondary dust collector connected in series, and the primary dust collector and the secondary dust collector are bag dust collectors.

[0013] Preferably, the cooling chamber is provided with temperature and material level sensors, and the sensors are electrically connected to the first sealing valve, the second sealing valve, the first control valve and the second control valve.

[0014] Preferably, the first sealing valve and the second sealing valve both use electric high-temperature resistant gates.

[0015] The utility model discloses a cooling and discharging system for a sludge thermal drying device, which has the following beneficial effects.

[0016] First, inert gas is used to cool the dried sludge, which quickly reduces the temperature of the dried sludge while ensuring that the dried sludge with a high organic matter content does not spontaneously combust or cause dust explosions;

[0017] Secondly, the first sealing valve and the second sealing valve are used and their opening and closing states are reasonably controlled to ensure the sealing of the dried sludge cooling process and prevent the dried sludge from increasing its moisture content due to contact with water during the cooling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of a cooling and discharging system for a sludge thermal drying device in the utility model.

[0019] In the attached figure: 1. Sludge thermal drying device; 2. Cooling chamber; 21. First sealing valve; 22. Second sealing valve; 23. Inert gas inlet; 24. Inert gas outlet; 3. Inert gas supply system; 31. First check valve; 32. First control valve; 33. Dust removal device; 331. Primary dust collector; 332. Secondary dust collector; 34. Air cooler; 35. Circulating fan; 36. Inert gas buffer tank; 361. Inert gas replenishment port; 362. Ash discharge port; 37. Second control valve; 38. Second check valve; 4. Screw conveyor; 5. Drying sludge bin. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0022] The utility model discloses a cooling and discharging system for a sludge thermal drying device, which cools the dried sludge and quickly reduces the temperature of the dried sludge while ensuring that the dried sludge with a high organic matter content does not spontaneously combust or cause dust explosion, thereby achieving a scenario of safe cooling of the dried sludge.

[0023] Reference Figure 1 A cooling and discharging system for a sludge thermal drying device includes a cooling chamber 2, a screw conveyor 4, and a dried sludge bin 5. The cooling chamber is connected to the sludge thermal drying device 1 through a pipeline. The screw conveyor 4 connects the cooling chamber 2 and the dried sludge bin 5. The cooling chamber 2 is connected to an inert gas supply system 3 through a pipeline. The cooling chamber 2 allows the low-temperature inert gas provided by the inert gas supply system 3 to directly collide and contact with the material to cool the dried sludge.

[0024] A first sealing valve 21, a second sealing valve 22, an inert gas inlet 23 and an inert gas outlet 24 are provided on the cooling chamber 2; the first sealing valve 21 is provided on the pipe connecting the sludge thermal drying device 1 and the cooling chamber 2, and the second sealing valve 22 is provided on the pipe connecting the cooling chamber 2 and the screw conveyor 4. The first sealing valve 21 and the second sealing valve 22 are used and their opening and closing states are reasonably controlled to ensure the sealing of the cooling process of the dried sludge, thereby preventing the dried sludge from increasing its moisture content due to contact with moisture during the cooling process. The cooling chamber 2 is placed below the discharge port of the sludge thermal drying device 1. The first sealing valve 21 is intermittently opened to allow the dried sludge to fall into the cooling chamber 2 by gravity. When the first sealing valve 21 is opened, the second sealing valve 22 remains closed. The first sealing valve 21 and the second sealing valve 22 both adopt electric high-temperature resistant gate form, and use inert gas to cool the dried sludge. While quickly reducing the temperature of the dried sludge, it is ensured that the dried sludge with a high organic matter content does not spontaneously combust or cause dust explosion.

[0025] Specifically, the inert gas supply system 3 includes a dust removal device 33, an air cooler 34, and a circulating fan 35. These are connected in series. The dust removal device 33 is connected to the inert gas outlet 24 via a pipe, and the circulating fan 35 is connected to the inert gas inlet 23 via a pipe. To maintain an inert gas atmosphere, the inert gas supply system 3 also includes an inert gas buffer tank 36 connected between the circulating fan 35 and the inert gas inlet 23. The inert gas buffer tank 36 is provided with an inert gas replenishment port 361. The dust removal device 33 includes a primary dust collector 331 and a secondary dust collector 332 connected in series. Both the primary dust collector 331 and the secondary dust collector 332 utilize bag filters. To facilitate the discharge of dust from the inert gas buffer tank 36, an ash discharge port 362 is provided at the bottom of the inert gas buffer tank 36, with a control valve at the front end of the ash discharge port 362. In order to better control the contact timing between the inert gas and the dried sludge and reduce the mixing of dried sludge in the inert gas, a first check valve 31 and a first control valve 32 are provided in sequence between the inert gas outlet 24 and the dust removal device 33, and a second check valve 38 and a second control valve 37 are provided in sequence between the inert gas buffer tank 36 and the inert gas inlet 23.

[0026] To better ensure a sealed cooling process for the dried sludge, temperature and level sensors are installed in the cooling chamber 2. These sensors are electrically connected to the first sealing valve 21, the second sealing valve 22, the first control valve 32, and the second control valve 37. When the temperature and level are higher than the set values, the first sealing valve 21 and the second sealing valve 22 remain closed, while the second control valve 37 and the first control valve 32 open to cool the dried sludge. To prevent waste of inert gas, the second control valve 37 and the first control valve 32 are closed when any sealing valve in the cooling chamber 2 is open.

[0027] In this embodiment, the inert gas after cooling and drying the sludge passes through the primary dust collector 331 and the secondary dust collector 332 for dust removal, and its temperature is reduced by the air cooler 34. It is then pressurized by the circulating fan 35 and enters the inert gas buffer tank 36. The inert gas is controlled to enter the cooling chamber 2 by the second control valve 37.

[0028] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Replacements may include partial structures, devices, or method steps, or they may be complete technical solutions. Equivalent replacements or modifications based on the technical solution and its concept of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A cooling and discharging system for a sludge thermal drying device, characterized in that: It comprises a cooling chamber (2), a screw conveyor (4) and a drying sludge chamber (5), wherein the cooling chamber is connected to the sludge thermal drying device (1), the screw conveyor (4) connects the cooling chamber (2) to the drying sludge chamber (5), and the cooling chamber (2) is connected to the inert gas supply system (3); The cooling chamber (2) is provided with a first sealing valve (21), a second sealing valve (22), an inert gas inlet (23) and an inert gas outlet (24); the first sealing valve (21) is provided between the sludge thermal drying device (1) and the cooling chamber (2), and the second sealing valve (22) is provided between the cooling chamber (2) and the screw conveyor (4).

2. A cooling and discharging system for a sludge thermal drying device according to claim 1, characterized in that: The inert gas supply system (3) comprises a dust removal device (33), an air cooler (34), and a circulating fan (35). The dust removal device (33), the air cooler (34), and the circulating fan (35) are connected in series in sequence. The dust removal device (33) is connected to the inert gas outlet (24), and the circulating fan (35) is connected to the inert gas inlet (23).

3. A cooling and discharging system for a sludge thermal drying device according to claim 2, characterized in that: The inert gas supply system (3) further comprises an inert gas buffer tank (36) connected between the circulating fan (35) and the inert gas inlet (23), wherein the inert gas buffer tank (36) is provided with an inert gas replenishment port (361) and an ash discharge port (362).

4. A cooling and discharging system for a sludge thermal drying device according to claim 3, characterized in that: A first check valve (31) and a first control valve (32) are sequentially provided between the dust removal device (33) and the inert gas outlet (24), and a second check valve (38) and a second control valve (37) are sequentially provided between the inert gas buffer tank (36) and the inert gas inlet (23).

5. The cooling and discharging system for a sludge thermal drying device according to claim 2, characterized in that: The dust removal device (33) comprises a primary dust collector (331) and a secondary dust collector (332) connected in series, wherein the primary dust collector (331) and the secondary dust collector (332) are bag dust collectors.

6. The cooling and discharging system for a sludge thermal drying device according to claim 5, characterized in that: The first sealing valve (21) and the second sealing valve (22) both use electric high-temperature resistant gates.

7. The cooling and discharging system for a sludge thermal drying device according to claim 1, characterized in that: The cooling chamber (2) is provided with a temperature and material level sensor, and the sensor is electrically connected to the first sealing valve (21), the second sealing valve (22), the first control valve (32) and the second control valve (37).

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