An explosion-proof system and control method for a rotary sludge drying equipment

Abstract

The present invention provides an explosion-proof system and control method for a rotary sludge drying device, which relates to the technical field of sludge treatment and aims to solve the problem that sludge is prone to explosion during the drying process in the existing drying device. The explosion-proof system for the rotary sludge drying device includes a main body of the drying device, a steam delivery pipeline, and a control system. The steam delivery pipeline is connected to the main body of the drying device, and a steam control valve is arranged on the steam delivery pipeline. A sludge inlet, a sludge outlet, a flue gas inlet, and a flue gas outlet are respectively arranged at both ends of the main body of the drying device. The flue gas outlet is connected to an exhaust pipeline, and an exhaust fan is arranged on the exhaust pipeline. A humidity sensor and an oxygen content detector are arranged at one end of the exhaust pipeline close to the flue gas outlet. The humidity sensor, the oxygen content detector, and the steam control valve are all connected to the control system. The explosion-proof system for the rotary sludge drying device of the present invention can reduce the risk of dust explosion, ensure the safe operation of sludge during the drying process, and ensure the safety of personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and particularly to an explosion-proof system and control method for a rotary sludge drying device. Background Art

[0002] Sludge drying, as an important means of reduction, has a large number of engineering application cases in the process of sludge disposal. However, a large amount of dust is generated during the sludge drying process. Especially for rotary drying devices, under the action of the flight bars, the material is lifted to a certain height and then falls, increasing the contact area between the material and the heat carrier, improving the drying efficiency and pushing the material forward in the cylinder. A large amount of dust will be generated in this process. When the sludge is in a completely dry state, the particle size is generally small. At the same time, due to the friction and impact between the sludge and between the sludge and the drying main body, a large amount of dust with a particle size less than 150 μm is generated in the drying environment. Due to the continuous collision between the sludge and between the sludge and the drying main body, this kind of dust with a high organic matter content has the risk of dust explosion under certain oxygen, temperature and ignition energy conditions.

[0003] The existing patent CN 202415333U discloses a sludge thermal drying and co-firing treatment system with coal, including: a sludge storage tank, a sludge screw conveyor, a screw pump, a dryer, a cyclone separator, a dry sludge screw conveyor and a belt conveyor. The dryer includes: a feed inlet, a drying main body, a screw discharge machine, a driving device, a rotor device, an air inlet, an explosion-proof port and an air outlet. Among them, the drying main body is a cavity structure. The feed inlet is arranged on one side of the drying main body. The screw discharge machine is arranged on the other side of the drying main body opposite to the feed inlet. The rotor device is connected to the driving device and arranged above the screw discharge machine. The air inlet is arranged on the drying main body and above the feed inlet. The air outlet is arranged on the side of the drying main body opposite to the air inlet. The explosion-proof port is arranged on the drying main body and between the air inlet and the air outlet. However, the dryer in this system does not set effective measures to prevent explosion. There is still a risk of dust explosion during the drying process of sludge in the dryer, with low safety, great risks to operators and equipment, and it is necessary to make improvements. Summary of the Invention

[0004] The purpose of the present invention is to provide an explosion-proof system and control method for a rotary sludge drying device to solve the problem that sludge is prone to explosion during the drying process in the dryer in the prior art. The explosion-proof system of the rotary sludge drying device of the present invention can reduce the risk of dust explosion, improve the safety and stability of the system, ensure the safe operation of sludge during the drying process, ensure the personal safety of operators, and has a high degree of automation, reducing personnel operation.

[0005] An explosion-proof system for a rotary sludge drying device provided by the present invention includes a drying device main body, a steam transmission pipeline, and a control system. The steam transmission pipeline is connected to the drying device main body. A steam control valve is provided on the steam transmission pipeline. A sludge inlet, a sludge outlet, a flue gas inlet, and a flue gas outlet are respectively provided at both ends of the drying device main body. The flue gas outlet is connected to an exhaust pipeline. An exhaust fan is provided on the exhaust pipeline. A humidity sensor and an oxygen content detector are provided at one end of the exhaust pipeline close to the flue gas outlet. The humidity sensor, the oxygen content detector, and the steam control valve are all connected to the control system.

[0006] As a preferred solution of the present invention, a VOCs detector is further provided at one end of the exhaust pipeline close to the flue gas outlet, and a pressure sensor is provided inside the drying device main body. The pressure sensor, the VOCs detector, and the exhaust fan are all connected to the control system.

[0007] As a preferred solution of the present invention, a feed hopper is connected to the sludge inlet of the drying device main body, and a discharge hopper is connected to the sludge outlet of the drying device main body. Gravity sensors are provided on both the feed hopper and the discharge hopper. The gravity sensors are connected to the control system.

[0008] As a preferred solution of the present invention, a temperature sensor is further provided at one end of the exhaust pipeline close to the flue gas outlet. The flue gas inlet of the drying device main body is connected to the flue gas outlet of a heating furnace through a smoke inlet pipeline. The heating furnace and the temperature sensor are both connected to the control system.

[0009] As a preferred solution of the present invention, an explosion-proof port is provided on the drying device main body.

[0010] As a preferred solution of the present invention, the drying device main body is a rotary dryer. A kiln head hood and a kiln tail hood are respectively provided at both ends of the drying device main body. The sludge inlet and the flue gas outlet are provided on the kiln head hood, and the sludge outlet and the flue gas inlet are provided on the kiln tail hood.

[0011] As a preferred solution of the present invention, two steam branch pipelines are connected to the steam transmission pipeline, and the two steam branch pipelines are respectively connected to the kiln head hood and the kiln tail hood.

[0012] As a preferred solution of the present invention, the steam branch pipeline is connected to the kiln head hood or the kiln tail hood through a flange.

[0013] The present invention also provides a control method for an explosion-proof system of a rotary sludge drying device as described above, characterized in that the control method includes:

[0014] The humidity sensor obtains the humidity value of the exhaust flue gas, and the oxygen content detector obtains the oxygen content in the exhaust flue gas;

[0015] Compare the humidity value and the oxygen content with the set abnormal range to determine whether the humidity value and the oxygen content reach the abnormal range;

[0016] If the humidity value and the oxygen content are within the abnormal range, the control system controls the opening degree of the steam control valve to be greater than 50%;

[0017] If the oxygen content and the humidity value are within the normal range, the control system sets a target humidity value according to the numerical range where the oxygen content is located and controls the opening degree of the steam control valve to make the humidity value reach the target humidity value.

[0018] As a preferred solution of the present invention, the pressure sensor obtains the pressure value inside the drying main body, and the VOCs detector obtains the VOCs content in the exhaust flue gas,

[0019] Compare the pressure value and the VOCs content with the set abnormal range to determine whether the pressure value and the VOCs content reach the abnormal range;

[0020] If the pressure value and the VOCs content are within the abnormal range, the control system controls the wind speed of the exhaust fan to the maximum value;

[0021] If the pressure value and the VOCs content are within the normal range, the control system controls the wind speed of the exhaust fan according to the pressure value.

[0022] Compared with the prior art, the present invention has the following positive effects:

[0023] 1. The explosion-proof system of the rotary sludge drying equipment provided by the present invention comprises a drying equipment body, a steam conveying pipeline and a control system. The steam conveying pipeline is connected to the drying equipment body, a steam control valve is arranged on the steam conveying pipeline, a sludge inlet and a sludge outlet as well as a smoke inlet and a smoke outlet are arranged at both ends of the drying equipment body, the smoke outlet is connected to the smoke exhaust pipeline, a smoke exhaust fan is arranged on the smoke exhaust pipeline, a humidity sensor and an oxygen content detector are arranged at one end of the smoke exhaust pipeline close to the smoke outlet, and the humidity sensor, the oxygen content detector and the steam control valve are all connected to the control system. The explosion-proof system of the present invention is provided with a humidity sensor and an oxygen content detector for respectively detecting the humidity value and oxygen content of the exhaust flue gas, which are used to react to the air humidity and oxygen content during the drying process of the sludge inside the main body of the drying equipment. The control system collects the humidity value and oxygen content in real time. When the humidity value and the oxygen content exceed their safety set values, the steam control valve is automatically opened, and the opening of the steam control valve is controlled to control the amount of steam transported into the main body of the drying equipment. The steam introduced into the main body of the drying equipment can reduce the oxygen concentration in the main body of the drying equipment, and increase the air humidity to allow the sludge dust to settle quickly, so that the dust explosion conditions cannot be met during the sludge drying process, thereby reducing the risk of dust explosion, improving the safety and stability of the system, ensuring the safe operation of the sludge during the drying process, and ensuring the personal safety of the operators. The system has a high degree of automation and reduces human operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of the explosion-proof system of the rotary sludge drying equipment of the present invention;

[0026] Figure 2 The control principle diagram of the explosion-proof system of the rotary sludge drying equipment of the present invention;

[0027] Figure 3 A method for controlling a steam control valve of an explosion-proof system of a rotary sludge drying equipment of the present invention;

[0028] Figure 4 The invention discloses a method for controlling a smoke exhaust fan of an explosion-proof system of a rotary sludge drying equipment.

[0029] In the figure: 1. Main body of the drying equipment; 11. Kiln head hood; 111. Sludge inlet; 112. Flue gas outlet; 12. Kiln tail hood; 121. Sludge outlet; 122. Flue gas inlet; 13. Explosion-proof opening; 31. Smoke inlet pipe; 32. Smoke exhaust pipe; 4. Steam delivery pipe; 41. Steam control valve; 42. Flowmeter; 43. Steam branch pipe; 5. Smoke exhaust fan; 6. Control system; 61. Humidity sensor; 62. Oxygen content detector; 63. VOCs detector; 64. Temperature sensor; 65. Pressure sensor; 7. Heating furnace; 8. Chimney. Detailed implementation manners

[0030] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] The following further describes in detail the specific implementation manners of the present invention with reference to the drawings.

[0033] Embodiment 1:

[0034] An explosion-proof system for a rotary sludge drying equipment provided in this embodiment is as Figure 1 - Figure 2As shown in the figure, it includes a drying equipment main body 1, a steam delivery pipeline 4, and a control system 6. The steam delivery pipeline 4 is connected to the drying equipment main body 1. A steam control valve 41 is provided on the steam delivery pipeline 4. A sludge inlet 111, a sludge outlet 121, a flue gas inlet 122, and a flue gas outlet 112 are respectively provided at both ends of the drying equipment main body 1. The flue gas outlet 112 is connected to an exhaust smoke pipeline 32. An exhaust smoke fan 5 is provided on the exhaust smoke pipeline 32. A humidity sensor 61 and an oxygen content detector 62 are provided at one end of the exhaust smoke pipeline 32 close to the flue gas outlet 112. The humidity sensor 61, the oxygen content detector 62, and the steam control valve 41 are all connected to the control system 6. The exhaust smoke pipeline 32 is connected to a chimney 8. The steam control valve 41 selects a globe valve and can control the required gas volume. The steam pressure in the steam delivery pipeline 4 is 0.5 MPa, and the temperature is 159 °C. A flowmeter 42 is provided on the steam delivery pipeline 4, and the flowmeter 42 is connected to the control system 6.

[0035] Since dust explosion needs to meet the following conditions: a. Combustible dust is suspended in the air at an appropriate concentration; b. There is sufficient air and oxidant; c. There is a fire source or strong vibration and friction. During the sludge drying process, sludge drying is a process of dehydrating organic sludge to prepare for subsequent carbonization. It is impossible to avoid the dust source, and the dust contains organic matter and is combustible; and generally, the flue gas of a heating furnace is used as the heat source for sludge drying, so air or oxygen enters the drying equipment; during the sludge drying process, friction between the sludge and the furnace body will generate a fire source. Therefore, dust explosion is likely to occur during the sludge drying process.

[0036] In the explosion-proof system of this embodiment, by setting a humidity sensor 61 and an oxygen content detector 62 to respectively detect the humidity value and oxygen content of the discharged flue gas, which are used to reflect the air humidity and oxygen content during the drying process of the sludge inside the drying equipment main body 1. The control system collects the humidity value and oxygen content in real time. When the humidity value and oxygen content exceed their safety set values, the steam control valve 41 is automatically opened, and the opening degree of the steam control valve 41 is controlled to control the steam volume delivered into the drying equipment main body. The steam introduced into the drying equipment main body can reduce the oxygen concentration in the drying equipment main body 1 and increase the air humidity to quickly settle the sludge dust, so that the dust explosion conditions cannot be met during the sludge drying process, thereby reducing the risk of dust explosion, improving the safety and stability of the system, ensuring the safe operation of the sludge during the drying process, ensuring the personal safety of the operators, and having a high degree of automation and reducing personnel operation.

[0037] Preferably, a VOCs detector 63 is further provided at one end of the exhaust smoke pipeline 32 close to the flue gas outlet 112, and a pressure sensor 65 is provided inside the drying equipment main body 1. The pressure sensor 65, the VOCs detector 63, and the exhaust smoke fan 5 are all connected to the control system 6. The exhaust smoke fan 5 is a centrifugal fan and adopts variable frequency control.

[0038] In this embodiment, a VOCs detector 63 and a pressure sensor 65 are provided to detect the VOCs content in the discharged flue gas and the pressure value inside the main body of the drying equipment respectively. Since volatile organic compounds will be generated during the sludge drying process, when the volatile organic compounds exceed the safe concentration, there is a risk of gas explosion. The VOCs detector 63 is used to detect the content of volatile organic compounds and transmit the detection results to the control system 6 in real time. The control system 6 adjusts the rotation speed of the exhaust fan 5 in time by monitoring the VOCs content to prevent explosion caused by too high VOCs concentration. The control system 6 can monitor the pressure in the system in real time and keep the pressure inside the main body of the drying equipment in a slightly negative pressure state by adjusting the rotation speed of the fan 5.

[0039] Specifically, the humidity sensor 61, the oxygen content detector and the VOCs detector 63 are arranged on the upper side of the exhaust duct 32 to prevent dust from accumulating on the surface of the detection element and causing inaccurate measurement results.

[0040] Preferably, a feed hopper is connected to the sludge inlet 111 of the main body 1 of the drying equipment, and a discharge hopper is connected to the sludge outlet 121 of the main body 1 of the drying equipment. Gravity sensors are arranged on both the feed hopper and the discharge hopper, and the gravity sensors are connected to the control system 6. The gravity sensors are used to detect the feeding and discharging conditions of the main body 1 of the drying equipment.

[0041] During the operation of the sludge drying equipment, due to the evaporation of sludge moisture, it plays a role in increasing moisture and promoting dust settlement, and is not prone to explosion. However, when the equipment is started, since the amount of sludge material initially entering the equipment is relatively small and the generated vapor is quickly discharged, it will cause the dust to quickly form an aggregated state and is prone to explosion. When the equipment stops running, since the equipment no longer feeds materials, and the remaining dried sludge material inside the equipment needs to be discharged, the temperature inside the main body 1 of the drying equipment is still very high, and it is also prone to explosion.

[0042] When the sludge drying equipment in this embodiment is started, the steam control valve 41 is opened to reduce the oxygen concentration and increase the humidity in the cavity of the main body 1 of the drying equipment to increase the dust settlement property. After the gravity sensor on the discharge hopper monitors the discharge, the steam control valve 41 is closed and the steam supply is stopped. When the sludge drying equipment stops, when the gravity sensor on the feed hopper monitors the stop of feeding, the steam control valve 41 is opened to reduce the oxygen concentration and increase the humidity in the cavity of the main body 1 of the drying equipment to increase the dust settlement property. After the gravity sensor on the discharge hopper monitors the stop of discharging, the equipment stops working, and at the same time the steam control valve 41 is closed and the steam supply is stopped.

[0043] Preferably, a temperature sensor 64 is further provided at one end of the smoke exhaust pipe 32 close to the smoke outlet 112. The smoke inlet 122 of the drying equipment main body 1 is connected to the smoke outlet of the heating furnace 7 through a smoke inlet pipe 31. Both the heating furnace 7 and the temperature sensor are connected to the control system. High-temperature flue gas is introduced into the drying equipment, where it exchanges heat with the sludge. The moisture of the sludge vaporizes and is discharged from the system through the smoke exhaust pipe 32.

[0044] The temperature sensor 64 in this embodiment is used to detect the smoke exhaust temperature. When the smoke exhaust temperature exceeds 200 °C, the temperature of the smoke inlet is reduced to lower the temperature inside the cavity of the drying equipment main body 1.

[0045] Preferably, an explosion-proof port 13 is provided on the drying equipment main body 1. When the pressure sensor 65 detects that the internal cavity pressure of the drying equipment main body 1 exceeds 1000 Pa, the explosion-proof port 13 automatically opens to discharge the tail gas and prevent explosion. By setting the explosion-proof port, the overall explosion-proof ability of the equipment is improved.

[0046] Preferably, the drying equipment main body 1 is a rotary dryer. A kiln head hood 11 and a kiln tail hood 12 are respectively provided at both ends of the drying equipment main body. The sludge inlet 111 and the smoke outlet 112 are provided on the kiln head hood 11, and the sludge outlet 121 and the smoke inlet 122 are provided on the kiln tail hood 12.

[0047] In this embodiment, during the drying process of the sludge, the sludge enters the rotary dryer from the feed hopper at the sludge inlet 111 and is discharged from the discharge hopper at the sludge outlet 121. The heat transfer with the flue gas adopts a countercurrent method. If the moisture content of the wet sludge is 80%, the moisture content can be reduced to 20% after drying.

[0048] Preferably, two steam branch pipes 43 are connected to the steam transmission pipe 4. The two steam branch pipes 43 are respectively connected to the kiln head hood 11 and the kiln tail hood 12. Steam enters the drying equipment main body 1 from both ends of the drying equipment main body 1, making the steam distribution in the drying equipment main body 1 more uniform to facilitate the rapid settlement of sludge dust.

[0049] Preferably, the steam branch pipe 43 is connected to the kiln head hood 11 or the kiln tail hood 12 through a flange for easy disassembly.

[0050] This embodiment also provides a control method for an explosion-proof system of a rotary sludge drying equipment as described above, characterized in that, as Figure 3 shown, the control method includes the following steps:

[0051] Step S11: The humidity sensor 61 obtains the humidity value h of the discharged flue gas, and the oxygen content detector 61 obtains the oxygen content w in the discharged flue gas.

[0052] Step S12: Compare the humidity value h and the oxygen content w with the set abnormal range to determine whether the humidity value h and the oxygen content w reach the abnormal range; wherein, the humidity value h is compared with the abnormal range H of humidity orv and the oxygen content w is compared with the abnormal range W of oxygen content orv .

[0053] Step S13: If the humidity value h and the oxygen content w are within the abnormal range, the control system 6 controls the opening degree of the steam control valve to be greater than 50%; wherein, the humidity value h is within the abnormal range H of humidity orv or the oxygen content w is within the abnormal range W of oxygen content orv .

[0054] Step S14: If the oxygen content w and the humidity value h are within the normal range, the control system 6 sets the target humidity value according to the numerical range where the oxygen content is located and controls the opening degree of the steam control valve to make the humidity value reach the target humidity value. Specifically, the normal range of the oxygen content is divided into W nrv1 and W nrv2 , where W nrv1 is 6%-8%; W nrv2 is 4%-6% and 8%-10%; if the oxygen content w is within the range of 6%-8% of W nrv1 , set the target humidity value to 15%; if the oxygen content w is within the range of 4%-6% or 8%-10% of W nrv2 , set the target humidity value to 30%.

[0055] Specifically, the abnormal range H of humidity orv is less than 10%; the abnormal range W of oxygen content orv is greater than 10% or less than 4%.

[0056] In the control method of this embodiment, during the process of controlling the steam control valve, when the humidity value h is less than 10%, or the oxygen content w is greater than 10%, or the oxygen content w is less than 4%, it is regarded as an abnormal deflagration state, and the control system 6 controls the opening degree of the steam control valve 41 to be greater than 50%, so that the steam quickly enters the main body 1 of the drying equipment to avoid explosion. When the humidity value h and the oxygen content w are not within the abnormal range, the control system 6 determines that the normal range to which the oxygen content w belongs is W nrv1 or W nrv2 , sets the target humidity value to 15% or 30%, and the control system 6 controls the opening degree of the steam control valve 41 to make the oxygen content w gradually approach the target humidity value for PID control adjustment.

[0057] In one embodiment, the pressure sensor 65 acquires the pressure value p inside the main body of the drying equipment, and the VOCs detector 63 acquires the VOCs content H in the discharged flue gas VOC .

[0058] Compare the pressure value p and the VOCs content H VOC with the set abnormal range to determine whether the pressure value p and the VOCs content H VOC reach the abnormal range.

[0059] If the pressure value p and the VOCs content H VOC are within the abnormal range, the control system 6 controls the wind speed of the exhaust fan to the maximum value.

[0060] If the pressure value p and the VOCs content H VOC are within the normal range, the control system 6 controls the wind speed of the exhaust fan according to the pressure value.

[0061] During the process of controlling the exhaust fan by the control method of this embodiment, when the detected pressure value p and the VOCs content H VOC are within the abnormal range, the control system 6 controls the wind speed of the exhaust fan to the maximum value to quickly decompress the inside of the main body 1 of the drying equipment or reduce the VOCs concentration; when the VOCs content H VOC is within the normal range, the controller uses the furnace pressure p as a determination index, and generally sets the target furnace pressure to -50 Pa according to experience to perform PID control adjustment on the wind speed of the exhaust fan.

[0062] The above is only the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can make several deformations and improvements without departing from the creative concept of the present invention, and all of them should be covered within the protection scope of the present invention.

Claims

1. A control method for an explosion-proof system of a rotary sludge drying device, characterized in that, The explosion-proof system of the rotary sludge drying equipment includes a drying equipment main body (1), a steam delivery pipeline (4), and a control system (6). The steam delivery pipeline (4) is connected to the drying equipment main body (1). A steam control valve (41) is provided on the steam delivery pipeline (4). A sludge inlet (111), a sludge outlet (121), a flue gas inlet (122), and a flue gas outlet (112) are respectively provided at both ends of the drying equipment main body (1). The flue gas outlet (112) is connected to an exhaust pipeline (32). An exhaust fan (5) is provided on the exhaust pipeline (32). A humidity sensor (61) and an oxygen content detector (62) are provided at one end of the exhaust pipeline (32) close to the flue gas outlet (112). The humidity sensor (61), the oxygen content detector (62), and the steam control valve (41) are all connected to the control system (6); The humidity sensor (61) and the oxygen content detector (62) are respectively used to detect the humidity value and the oxygen content of the discharged flue gas. The control system collects the humidity value and the oxygen content in real time. When the humidity value and the oxygen content exceed their safety set values, the steam control valve (41) is automatically opened, and the amount of steam delivered into the drying equipment main body is controlled by controlling the opening degree of the steam control valve (41); The control method includes: comparing the humidity value and the oxygen content with a set abnormal range to judge whether the humidity value and the oxygen content reach the abnormal range; If the humidity value and the oxygen content are within the abnormal range, the control system (6) controls the opening degree of the steam control valve (41) to be greater than 50%; If the oxygen content and the humidity value are within the normal range, the control system (6) sets a target humidity value according to the numerical range where the oxygen content is located and controls the opening degree of the steam control valve (41) to make the humidity value reach the target humidity value.

2. The control method of an explosion-proof system for a rotary sludge drying device according to claim 1, characterized in that, A VOCs detector (63) is also provided at one end of the exhaust pipeline (32) close to the flue gas outlet (112). A pressure sensor (65) is provided inside the drying equipment main body (1). The pressure sensor (65), the VOCs detector (63), and the exhaust fan (5) are all connected to the control system (6).

3. The control method of an explosion-proof system for a rotary sludge drying device according to claim 2, characterized in that, A feed hopper is connected to the sludge inlet (111) of the drying equipment main body (1). A discharge hopper is connected to the sludge outlet (121) of the drying equipment main body (1). Gravity sensors are provided on both the feed hopper and the discharge hopper. The gravity sensors are connected to the control system (6).

4. The control method of an explosion-proof system for a rotary sludge drying equipment according to claim 3, characterized in that, A temperature sensor (64) is also provided at one end of the exhaust pipeline (32) close to the flue gas outlet (112). The flue gas inlet (122) of the drying equipment main body (1) is connected to the flue gas outlet of a heating furnace (7) through a flue gas pipeline (31). The heating furnace (7) and the temperature sensor are both connected to the control system.

5. The control method of an explosion-proof system for a rotary sludge drying device according to claim 2, characterized in that, An explosion-proof port (13) is provided on the drying equipment main body (1).

6. The control method of an explosion-proof system for a rotary sludge drying device according to claim 1, characterized in that, The main body (1) of the drying equipment is a rotary dryer. A kiln head hood (11) and a kiln tail hood (12) are respectively arranged at both ends of the main body of the drying equipment. The sludge inlet (111) and the flue gas outlet (112) are arranged on the kiln head hood (11), and the sludge outlet (121) and the flue gas inlet (122) are arranged on the kiln tail hood (12).

7. The control method of an explosion-proof system for a rotary sludge drying device according to claim 6, characterized in that, Two steam branch pipes (43) are connected to the steam conveying pipe (4). The two steam branch pipes (43) are respectively connected to the kiln head hood (11) and the kiln tail hood (12).

8. The control method of an explosion-proof system for a rotary sludge drying device according to claim 6, characterized in that, The steam branch pipe (43) is connected to the kiln head hood (11) or the kiln tail hood (12) through a flange.

9. The control method of an explosion-proof system for a rotary sludge drying device according to claim 2, characterized in that The pressure sensor (65) obtains the pressure value inside the drying main body, and the VOCs detector (63) obtains the VOCs content in the discharged flue gas. Compare the pressure value and the VOCs content with the set abnormal range to judge whether the pressure value and the VOCs content reach the abnormal range. If the pressure value and the VOCs content are within the abnormal range, the control system (6) controls the wind speed of the exhaust fan (5) to the maximum value. If the pressure value and the VOCs content are within the normal range, the control system (6) controls the wind speed of the exhaust fan (5) according to the pressure value.

Images