CN115636568A - Explosion-proof system of rotary sludge drying equipment and control method - Google Patents
Explosion-proof system of rotary sludge drying equipment and control method Download PDFInfo
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- CN115636568A CN115636568A CN202211357064.8A CN202211357064A CN115636568A CN 115636568 A CN115636568 A CN 115636568A CN 202211357064 A CN202211357064 A CN 202211357064A CN 115636568 A CN115636568 A CN 115636568A
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Abstract
The invention provides an explosion-proof system of rotary sludge drying equipment and a control method, which relate to the technical field of sludge treatment and aim to solve the problem that sludge is easy to explode in the drying process of the drying equipment in the prior art. The explosion-proof system of the rotary sludge drying equipment can reduce the risk of dust explosion, ensure the safe operation of sludge in the drying process and ensure the safety of personnel.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to an explosion-proof system of rotary sludge drying equipment and a control method.
Background
Sludge drying is an important means for reduction, and has a large number of engineering application cases in the sludge disposal process. However, a large amount of dust is generated in the sludge drying process, especially for rotary drying equipment, under the action of a shoveling plate, sludge falls down after being shoveled to a certain height, so that the contact surface between the material and a heat carrier is increased, the drying efficiency is improved, the material is pushed to advance in a cylinder, and a large amount of dust is generated in the process. The sludge generally has small particle size in a full dry state, and a large amount of dust less than 150 mu m is generated in a drying environment due to friction and impact among the sludge and between the sludge and a drying main body. Due to the constant collision between the sludge and the drying body, the dust with high organic content has the risk of dust explosion under certain oxygen, temperature and ignition energy conditions.
The prior patent CN 202415333U discloses a sludge heat drying and coal blending combustion treatment system, which comprises: mud reservoir, mud screw conveyer, screw pump, desicator, cyclone, dry mud screw conveyer and band conveyer, the desicator includes: feed inlet, dry main part, spiral ejection of compact machine, drive arrangement, rotor device, air intake, explosion-proof mouth and air outlet, wherein dry main part is cavity structure, the feed inlet sets up one side of dry main part, spiral ejection of compact machine sets up dry main part with the opposite side that the feed inlet is relative, the rotor device with drive arrangement is connected and sets up spiral ejection of compact machine upside, the air intake sets up in the dry main part and lie in the feed inlet upside, the air outlet sets up in the dry main part with one side that the air intake is relative, explosion-proof mouth sets up in the dry main part and lie in the air intake with between the air outlet. However, the dryer in the system is not provided with effective measures for preventing explosion, the sludge is easily subjected to the risk of dust explosion in the drying process in the dryer, the safety is low, and the risk to operators and equipment is high, so that improvement is needed.
Disclosure of Invention
The invention aims to provide an explosion-proof system of rotary sludge drying equipment and a control method, which aim to solve the problem that sludge is easy to explode in the drying process of a dryer in the prior art.
The invention provides an explosion-proof system of rotary sludge drying equipment, which comprises a drying equipment main body, a steam conveying pipeline and a control system, wherein the steam conveying pipeline is connected with the drying equipment main body, a steam control valve is arranged on the steam conveying pipeline, a sludge inlet, a sludge outlet, a smoke inlet and a smoke outlet are respectively arranged at two ends of the drying equipment main body, the smoke outlet is connected with a 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, close to the smoke outlet, of the smoke exhaust pipeline, and the humidity sensor, the oxygen content detector and the steam control valve are all connected with the control system.
As a preferred scheme of the invention, a VOCs detector is further arranged at one end of the smoke exhaust pipeline close to the smoke outlet, a pressure sensor is arranged in the drying equipment main body, and the pressure sensor, the VOCs detector and the smoke exhaust fan are all connected with the control system.
As a preferable scheme of the present invention, a sludge inlet of the drying apparatus main body is connected to a feed hopper, a sludge outlet of the drying apparatus main body is connected to a discharge hopper, and the feed hopper and the discharge hopper are both provided with gravity sensors, and the gravity sensors are connected to the control system.
As a preferable scheme of the invention, a temperature sensor is further arranged at one end of the smoke exhaust pipeline close to the smoke outlet, the smoke inlet of the drying equipment main body is connected with the smoke outlet of the heating furnace through a smoke inlet pipeline, and the heating furnace and the temperature sensor are both connected with the control system.
In a preferred embodiment of the present invention, the drying apparatus main body is provided with an explosion-proof port.
As a preferable scheme of the present invention, the drying apparatus main body is a rotary dryer, a kiln head cover and a kiln tail cover are respectively disposed at two ends of the drying apparatus main body, the sludge inlet and the flue gas outlet are disposed on the kiln head cover, and the sludge outlet and the flue gas inlet are disposed on the kiln tail cover.
As a preferable scheme of the invention, the steam conveying pipeline is connected with two steam branch pipelines, and the two steam branch pipelines are respectively connected with the kiln head cover and the kiln tail cover.
As a preferable scheme of the present invention, the steam branch pipe is connected to the kiln head hood or the kiln tail hood through a flange.
The invention also provides a control method of the explosion-proof system of the rotary sludge drying equipment, which is characterized by comprising the following steps:
the humidity sensor acquires the humidity value of the discharged flue gas, and the oxygen content detector acquires the oxygen content in the discharged flue gas;
comparing the humidity value and the oxygen content with a set abnormal range, and judging whether the humidity value and the oxygen content reach the abnormal range;
if the humidity value and the oxygen content are in abnormal ranges, the control system controls the opening of the steam control valve to be larger than 50%;
and if the oxygen content and the humidity value are in the normal range, the control system sets a target humidity value according to the numerical range of the oxygen content and controls the opening of the steam control valve to enable the humidity value to reach the target humidity value.
As a preferable aspect of the present invention, the pressure sensor acquires a pressure value in the drying main body, the VOCs detector acquires a VOCs content in the exhaust flue gas,
comparing the pressure value and the content of VOCs with a set abnormal range, and judging whether the pressure value and the content of VOCs reach the abnormal range;
if the pressure value and the content of VOCs are in the abnormal range, the control system controls the wind speed of the smoke exhaust fan to be the maximum value;
and if the pressure value and the content of VOCs are within a normal range, the control system controls the wind speed of the smoke exhaust fan according to the pressure value.
Compared with the prior art, the invention has the following positive effects:
1. the invention provides an explosion-proof system of rotary sludge drying equipment, which comprises a drying equipment main body, a steam conveying pipeline and a control system, wherein the steam conveying pipeline is connected with the drying equipment main body, a steam control valve is arranged on the steam conveying pipeline, a sludge inlet, a sludge outlet, a smoke inlet and a smoke outlet are respectively arranged at two ends of the drying equipment main body, the smoke outlet is connected with a 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, close to the smoke outlet, of the smoke exhaust pipeline, and the humidity sensor, the oxygen content detector and the steam control valve are all connected with the control system. The explosion-proof system is provided with the humidity sensor and the oxygen content detector which are respectively used for detecting the humidity value and the oxygen content of discharged flue gas and are used for reflecting the air humidity and the oxygen content of sludge in the drying process in the drying equipment main body, the control system collects the humidity value and the oxygen content in real time, when the humidity value and the oxygen content exceed safety set values, the steam control valve is automatically opened, the opening degree of the steam control valve is controlled to control the steam quantity conveyed into the drying equipment main body, steam introduced into the drying equipment main body can reduce the oxygen concentration in the drying equipment main body, and the air humidity is increased to enable sludge and dust to be rapidly settled, so that the dust explosion condition cannot be met in the sludge drying process, the risk of dust explosion is reduced, the safety and stability of the system are improved, the safe operation of the sludge in the drying process is ensured, the personal safety of operators is ensured, the automation degree is high, and the personnel operation is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an explosion-proof system of a rotary sludge drying apparatus according to the present invention;
FIG. 2 is a control schematic diagram of the explosion-proof system of the rotary sludge drying equipment of the present invention;
FIG. 3 is a control method for a steam control valve of an explosion-proof system of a rotary sludge drying equipment of the invention;
fig. 4 is a control method of the smoke exhaust fan of the explosion-proof system of the rotary sludge drying equipment of the invention.
In the figure: 1. a drying apparatus main body; 11. a kiln head cover; 111. a sludge inlet; 112. a flue gas outlet; 12. a kiln tail cover; 121. a sludge outlet; 122. a flue gas inlet; 13. an explosion-proof port; 31. a smoke inlet pipeline; 32. a smoke exhaust duct; 4. a steam delivery conduit; 41. a steam control valve; 42. a flow meter; 43. a steam branch pipe; 5. a smoke exhaust fan; 6. a control system; 61. a humidity sensor; 62. an oxygen content detector; 63. a VOCs detector; 64. a temperature sensor; 65. a pressure sensor; 7. heating furnace; 8. and (4) a chimney.
Detailed Description
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing and simplifying the present invention, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Example 1:
the explosion-proof system of the rotary sludge drying equipment provided by the embodiment comprises a drying equipment main body 1, a steam conveying pipeline 4 and a control system 6, as shown in fig. 1-2. The steam conveying pipeline 4 is connected with the drying equipment main body 1, the steam conveying pipeline 4 is provided with a steam control valve 41, and two ends of the drying equipment main body 1 are respectively provided with a sludge inlet 111 and a sludge outlet 121, and a flue gas inlet 122 and a flue gas outlet 112. The smoke outlet 112 is connected with the smoke exhaust pipeline 32, the smoke exhaust fan 5 is arranged on the smoke exhaust pipeline 32, the humidity sensor 61 and the oxygen content detector 62 are arranged at one end, close to the smoke outlet 112, of the smoke exhaust pipeline 32, and the humidity sensor 61, the oxygen content detector 62 and the steam control valve 41 are all connected with the control system 6. The smoke exhaust duct 32 is connected to the stack 8. The steam control valve 41 selects a stop valve, and can control the required gas quantity. The steam pressure in the steam conveying pipeline 4 is 0.5MPa, and the temperature is 159 ℃. A flow meter 42 is arranged on the steam delivery line 4, and the flow meter 42 is connected to the control system 6.
The following conditions are required due to dust explosion: a. the combustible dust is suspended in the air at a proper concentration; b. sufficient air and oxidant are available; c. fire sources or strong vibration and friction. In the sludge drying process, the sludge drying is a process of dehydrating organic sludge, and is prepared for subsequent carbonization, so that a dust source cannot be avoided, and the dust contains organic matters and is flammable; in addition, the sludge drying generally takes the flue gas of a heating furnace as a heat source, so that air or oxygen enters drying equipment; the sludge is rubbed with the furnace body in the drying process to generate a fire source, so that dust explosion is easy to occur in the sludge drying process.
The explosion-proof system in this embodiment is provided with a humidity sensor 61 and an oxygen content detector 62, which are respectively used for detecting the humidity value and the oxygen content of the discharged flue gas, and are used for reflecting the air humidity and the oxygen content of the sludge in the drying process inside the drying equipment main body 1, the control system collects the humidity value and the oxygen content in real time, when the humidity value and the oxygen content exceed the safety set values, the steam control valve 41 is automatically opened, the opening degree of the steam control valve 41 is controlled to control the steam quantity conveyed 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 the air humidity is increased to enable the sludge and dust to be rapidly settled, so that the dust explosion conditions cannot be met in 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 in the drying process, and ensuring the personal safety of operators, and having high automation degree, and reducing the operation of the operators.
Preferably, a VOCs detector 63 is further provided at an end of the smoke exhaust duct 32 near the smoke outlet 112, and a pressure sensor 65 is provided in the drying apparatus main body 1. The pressure sensor 65, the VOCs detector 63 and the smoke exhaust fan 5 are all connected with the control system 6. The smoke exhaust fan 5 is a centrifugal fan and adopts variable frequency control.
In this embodiment, the VOCs detector 63 and the pressure sensor 65 are respectively used for detecting the VOCs content in the exhaust flue gas and the pressure value in the main body of the drying apparatus. Because mud can produce volatile organic compounds at the mummification in-process, when volatile organic compounds exceeded safe concentration, produce the risk of gas explosion easily, VOCs detector 63 is used for detecting volatile organic compounds content to reach control system 6 with the real-time teletransmission of testing result. The control system 6 timely regulates and controls the rotating speed of the smoke exhaust fan 5 by monitoring the content of VOCs to prevent explosion caused by overhigh concentration of VOCs. The control system 6 can monitor the pressure in the system in real time, and the internal pressure of the drying equipment main body is kept in a micro-negative pressure state by adjusting the rotating speed of the fan 5.
Specifically, the humidity sensor 61 and the oxygen content detection and VOCs detector 63 are disposed on the upper side of the smoke exhaust duct 32, so that dust is prevented from accumulating on the surface of the detection element to cause inaccurate measurement results.
Preferably, the sludge inlet 111 of the drying device main body 1 is connected with a feed hopper, the sludge outlet 121 of the drying device main body 1 is connected with a discharge hopper, and the feed hopper and the discharge hopper are both provided with gravity sensors which are connected with the control system 6. The gravity sensor is used for detecting the feeding and discharging conditions of the drying equipment main body 1.
In the operation process of the sludge drying equipment, due to the evaporation of sludge moisture, the sludge drying equipment plays a role in increasing moisture and promoting dust sedimentation, and is not easy to explode. However, when the equipment is started, because the sludge entering the equipment is relatively less, the generated steam is quickly discharged, so that the dust is quickly formed into an accumulation state, and the explosion is easily generated. When the equipment stops operating, because the equipment is not fed any more, and residual dried sludge in the equipment needs to be discharged, the temperature in the drying equipment main body 1 is still high, and explosion is easy to occur.
When the sludge drying equipment in this embodiment is started, the steam control valve 41 is opened to reduce the oxygen concentration in the cavity of the drying equipment main body 1 and increase the humidity, so as to increase the dust settleability, and after the gravity sensor on the discharge hopper monitors the discharge, the steam control valve 41 is closed to stop the introduction of steam. When sludge drying equipment shut down, after gravity sensor on the feeder hopper monitored and stopped the feeding, steam control valve 41 was opened for reduce drying equipment main part 1 cavity oxygen concentration and increase humidity, in order to increase dust settleability, treat that gravity sensor on the hopper monitors no longer the ejection of compact after, equipment stop work, close steam control valve 41 simultaneously, stop letting in steam.
Preferably, a temperature sensor 64 is further disposed on the end of the smoke exhaust duct 32 close to the smoke outlet 112, the smoke inlet 122 of the drying apparatus main body 1 is connected with the smoke outlet of the heating furnace 7 through the smoke inlet duct 31, and the heating furnace 7 and the temperature sensor are both connected with the control system. The high-temperature flue gas is introduced into the drying equipment, heat exchange is carried out between the high-temperature flue gas and the sludge in the drying equipment main body 1, and the water content of the sludge is vaporized and discharged out of the system along with the smoke discharge pipeline 32.
The temperature sensor 64 in this embodiment is used to detect the temperature of the exhaust smoke, and when the temperature of the exhaust smoke exceeds the value of 200 ℃, the temperature of the inlet of the exhaust smoke is reduced to reduce the temperature in the cavity of the main body 1 of the drying apparatus.
Preferably, an explosion-proof port 13 is provided on the drying apparatus main body 1. When the pressure sensor 65 detects that the pressure in the inner cavity of the drying equipment main body 1 exceeds 1000pa, the explosion-proof port 13 is automatically opened, tail gas is discharged, and explosion is prevented. Through setting up explosion-proof mouthful, improve equipment's whole blast resistance.
Preferably, the drying apparatus main body 1 is a rotary dryer, a kiln head cover 11 and a kiln tail cover 12 are respectively arranged at two ends of the drying apparatus main body, the sludge inlet 111 and the flue gas outlet 112 are arranged on the kiln head cover 11, and the sludge outlet 121 and the flue gas inlet 122 are arranged on the kiln tail cover 12.
In the drying process of the sludge in the embodiment, the sludge enters the rotary dryer from the feed hopper at the sludge inlet 111, the sludge is discharged from the discharge hopper at the sludge outlet 121 and is subjected to heat transfer with the flue gas in a counter-current mode, and if the moisture content of the wet sludge is 80%, the moisture content can be reduced to 20% after drying.
Preferably, two steam branch pipes 43 are connected to the steam delivery pipe 4, and 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 the two ends of the drying equipment main body 1, so that the steam is more uniformly distributed in the drying equipment main body 1, and the sludge and dust can be rapidly settled.
Preferably, the steam branch pipe 43 is connected with the kiln head cover 11 or the kiln tail cover 12 through a flange, so as to be convenient to disassemble.
The embodiment also provides a control method of the explosion-proof system of the rotary sludge drying equipment, which is characterized in that as shown in fig. 3, the control method comprises the following steps:
step S11: the humidity sensor 61 acquires a humidity value h of the exhaust flue gas, and the oxygen content detector 61 acquires an oxygen content w in the exhaust flue gas.
Step S12: comparing the humidity value h and the oxygen content w with a set abnormal range, and judging whether the humidity value h and the oxygen content w reach the abnormal range; wherein the humidity value H and the abnormal range H of humidity orv Comparing the oxygen content W with an abnormal range of oxygen content W orv And (6) comparing.
Step S13: if the humidity value h and the oxygen content w are in the abnormal range, the control system 6 controls the opening of the steam control valve to be more than 50 percent; wherein the humidity value H is in the abnormal range H of humidity orv The internal or oxygen content W is in an abnormal range W of oxygen content orv And (4) the following steps.
Step S14: if the oxygen content w and the humidity value h are in the normal range, the control system 6 sets a target humidity value according to the numerical range of the oxygen content and controls the opening of the steam control valve to enable the humidity value to reach the target humidity value. Specifically, the normal range of oxygen content is divided into W nrv1 And W nrv2 Wherein W is nrv1 6% -8%; w nrv2 4% -6% and 8% -10%; if the oxygen content W is W nrv1 Within the range of 6% -8%, the target humidity value is set to 15%; if the oxygen content W is W nrv2 In the range of 4% -6% or 8% -10%, the target humidity value is set to 30%.
Specifically, the abnormal range H of humidity orv Less than 10%; abnormal range of oxygen content W orv Greater than 10% or less than 4%.
In the control method of the embodiment, in the process of controlling the steam control valve, when the humidity value h is less than 10%, or the oxygen content w is more than 10%, or the oxygen content w is less than 4%, it is regarded as explosionIn the abnormal combustion state, the control system 6 controls the opening of the steam control valve 41 to be larger than 50%, so that the steam can rapidly enter the drying equipment main body 1, and explosion is avoided. When the humidity value h and the oxygen content W are not in the abnormal ranges, the control system 6 judges that the normal range to which the oxygen content W belongs is W nrv1 Or W nrv2 The target humidity value is set to 15% or 30%, and the control system 6 controls the opening degree of the steam control valve 41 so that the oxygen content w gradually approaches the target humidity value, and performs PID control adjustment.
In one embodiment, the pressure sensor 65 obtains the pressure value p in the main body of the drying apparatus, and the VOCs detector 63 obtains the VOCs content H in the exhaust flue gas VOC 。
The pressure value p and the content H of VOCs are measured VOC Comparing with the set abnormal range, and judging the pressure value p and the content H of the VOCs VOC Whether the abnormal range is reached.
If the pressure value p and the VOCs content H VOC In the abnormal range, the control system 6 controls the wind speed of the smoke exhaust fan to the maximum value.
If the pressure value p and the VOCs content H VOC In the normal range, the control system 6 controls the air speed of the smoke exhaust fan according to the pressure value.
In the process of controlling the smoke exhaust fan by the control method of the embodiment, when the detected pressure value p and the content H of VOCs are detected VOC When the temperature is within the abnormal range, the control system 6 controls the air speed of the smoke exhaust fan to the maximum value so as to quickly reduce the pressure inside the drying equipment main body 1 or reduce the concentration of VOCs; when the content of VOCs is H VOC And when the temperature is within the normal range, the controller takes the furnace pressure p as a determination index, the target furnace pressure is set to-50 Pa through general experience, and the PID control adjustment is carried out on the wind speed of the smoke exhaust fan.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can make several variations and modifications without departing from the inventive concept, and all such variations and modifications are intended to be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides an explosion-proof system of rotation sludge drying equipment, its characterized in that, including drying equipment main part (1), steam conveying pipeline (4) and control system (6), steam conveying pipeline (4) with drying equipment main part (1) is connected be provided with steam control valve (41) on steam conveying pipeline (4) the both ends of drying equipment main part (1) are provided with mud import (111) and mud export (121) and flue gas import (122) and exhanst gas outlet (112) respectively, exhanst gas outlet (112) are connected with exhaust pipe (32) be provided with smoke exhaust fan (5) on exhaust pipe (32) be close to on exhaust pipe (32) the one end of exhanst gas outlet (112) is provided with humidity transducer (61) and oxygen content detector (62), humidity transducer (61) oxygen content detector (62) with steam control valve (41) all with control system (6) are connected.
2. The rotary sludge drying equipment explosion-proof system as claimed in claim 1, wherein a VOCs detector (63) is further arranged at one end of the smoke exhaust pipe (32) close to the smoke outlet (112), a pressure sensor (65) is arranged in the drying equipment main body (1), and the pressure sensor (65), the VOCs detector (63) and the smoke exhaust fan (5) are all connected with the control system (6).
3. The rotary sludge drying equipment explosion-proof system as claimed in claim 2, wherein 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), and gravity sensors are disposed on the feed hopper and the discharge hopper, and are connected to the control system (6).
4. The rotary sludge drying equipment explosion-proof system as claimed in claim 3, wherein a temperature sensor (64) is further disposed 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), and the heating furnace (7) and the temperature sensor are both connected to the control system.
5. The rotary sludge drying equipment explosion-proof system as claimed in claim 2, wherein the drying equipment main body (1) is provided with an explosion-proof port (13).
6. The rotary sludge drying equipment explosion-proof system as claimed in claim 1, wherein the drying equipment main body (1) is a rotary dryer, a kiln head cover (11) and a kiln tail cover (12) are respectively arranged at two ends of the drying equipment main body, the sludge inlet (111) and the flue gas outlet (112) are arranged on the kiln head cover (11), and the sludge outlet (121) and the flue gas inlet (122) are arranged on the kiln tail cover (12).
7. The rotary sludge drying equipment explosion-proof system as claimed in claim 6, wherein two branch steam pipes (43) are connected to the steam delivery pipe (4), and the two branch steam pipes (43) are respectively connected to the kiln head hood (11) and the kiln tail hood (12).
8. The rotary sludge drying equipment explosion-proof system as claimed in claim 6, wherein the steam branch pipe (43) is connected with the kiln head hood (11) or the kiln tail hood (12) through a flange.
9. The control method of the explosion-proof system of the rotary sludge drying equipment as claimed in any one of claims 2 to 8, characterized in that the control method comprises the following steps:
the humidity sensor (61) acquires the humidity value of the discharged flue gas, and the oxygen content detector (62) acquires the oxygen content in the discharged flue gas;
comparing the humidity value and the oxygen content with a set abnormal range, and judging whether the humidity value and the oxygen content reach the abnormal range or not;
if the humidity value and the oxygen content are in abnormal ranges, the control system (6) controls the opening degree of the steam control valve (41) to be larger than 50%;
if the oxygen content and the humidity value are within a normal range, the control system (6) sets a target humidity value according to the numerical range of the oxygen content and controls the opening of the steam control valve (41) to enable the humidity value to reach the target humidity value.
10. The control method according to claim 9, wherein the pressure sensor (65) acquires a pressure value in the drying main body, the VOCs detector (63) acquires a VOCs content in exhaust fumes,
comparing the pressure value and the content of VOCs with a set abnormal range, and judging whether the pressure value and the content of VOCs reach the abnormal range;
if the pressure value and the content of VOCs are in the abnormal range, the control system (6) controls the wind speed of the smoke exhaust fan (5) to be the maximum value;
and if the pressure value and the content of VOCs are within a normal range, the control system (6) controls the wind speed of the smoke exhaust fan (5) according to the pressure value.
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| CN202211357064.8A CN115636568A (en) | 2022-11-01 | 2022-11-01 | Explosion-proof system of rotary sludge drying equipment and control method |
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| CN202211357064.8A CN115636568A (en) | 2022-11-01 | 2022-11-01 | Explosion-proof system of rotary sludge drying equipment and control method |
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