CN-121248103-B - Sludge drying treatment system capable of accurately controlling oxygen content

CN121248103BCN 121248103 BCN121248103 BCN 121248103BCN-121248103-B

Abstract

The invention relates to the technical field of sludge drying treatment, in particular to a sludge drying treatment system capable of accurately controlling oxygen content. According to the invention, the oxygen concentration of different areas is monitored in real time by arranging a plurality of groups of oxygen content probes, when risks exist, an inert gas protection module is immediately started to control a nitrogen injection valve to be opened, meanwhile, different coping strategies are executed by executing continuous leakage diagnosis, and through analyzing the matching degree of the air quantity of the induced draft fan and the system state, the operation parameters are automatically adjusted, so that the system is always kept in an optimal and most energy-saving safe state, and when the real-time oxygen content is lower, whether the false image of temporary reduction of the oxygen content reading caused by dilution of combustible gas exists is analyzed, so that the judgment capability of the system on complex working conditions is improved, the situation is prevented, and the safety and the energy consumption of the system are ensured.

Inventors

ZHU MINGXING
QIN GUOFU

Assignees

北京艺高进益环境工程技术有限公司

Dates

Publication Date: 20260508
Application Date: 20251023

Claims (6)

1. The utility model provides a sludge drying treatment system of accurate control oxygen content which characterized in that includes: the oxygen content monitoring module comprises oxygen content probes arranged at a plurality of monitoring points in the drying equipment and is used for acquiring the real-time oxygen content of the monitoring points; the safety state judging module is connected with the oxygen content monitoring module and is used for outputting a first prevention and control state signal or a second prevention and control state signal according to the comparison result of the real-time oxygen content and a first preset threshold value; the inert gas protection module is connected with the safety state judging module and is used for responding to the first prevention and control state signal to start an emergency protection mode so as to inject inert gas into the drying equipment; The protection effect monitoring module is respectively connected with the oxygen content monitoring module and the inert gas protection module and is used for executing continuous leakage diagnosis after the inert gas protection module is started, positioning a leakage area according to a diagnosis result and executing corresponding parameter optimization; The safety state analysis module is connected with the safety state judging module and is used for responding to the second prevention and control state signal, and performing explosion risk analysis according to the real-time oxygen content and the combustible gas concentration so as to send out an early warning prompt; the safety state analysis module comprises a combustible gas analysis unit and a risk analysis unit; the combustible gas analysis unit is used for acquiring the concentration of the combustible gas, and performing explosion risk analysis according to the real-time oxygen content and the concentration of the combustible gas so as to identify whether false safety signals exist; The risk analysis unit is used for analyzing a risk source and generating an early warning prompt when a false safety signal exists; the combustible gas analysis unit comprises an oxygen content change curve monitoring subunit, a curve analysis subunit and a combustible gas concentration analysis subunit; The oxygen content change curve monitoring subunit is used for acquiring a change curve of the real-time oxygen content along with time to obtain an oxygen content change curve; The curve analysis subunit is used for obtaining the absolute value of the slope of the oxygen content change curve, obtaining a real-time slope, and comparing the real-time slope with a standard slope; the combustible gas concentration analysis subunit is used for judging whether the running state is normal or false safety signals exist according to the comparison of the real-time combustible gas concentration and the first standard combustible gas concentration when the real-time slope is larger than the standard slope; the risk analysis unit comprises a combustible gas distinguishing subunit, a rotating speed distinguishing subunit and a micro negative pressure distinguishing subunit; the combustible gas distinguishing subunit is used for comparing the real-time combustible gas concentration with the second standard combustible gas concentration when false safety signals exist; The rotating speed judging subunit is used for responding to the fact that the real-time combustible gas concentration is smaller than the second standard combustible gas concentration and determining whether the rotating speed of the induced draft fan is adjusted according to the comparison result of the real-time rotating speed and the standard rotating speed range; The micro negative pressure judging subunit is used for verifying the micro negative pressure in the drying equipment in response to the real-time rotating speed within the standard rotating speed range, and determining whether to reduce the temperature of a preset heat source or reduce the rotating speed of an induced draft fan according to the verification result; the risk analysis unit further comprises an early warning subunit; the early warning subunit comprises a first early warning subunit, a second early warning subunit and a third early warning subunit; The first early warning subunit responds to the fact that the real-time combustible gas concentration is larger than or equal to the second standard combustible gas concentration and sends out an alarm prompt for the release of the combustible gas; the second early warning subunit sends out an alarm prompt of sealing failure when the real-time drying pressure is larger than the maximum value of the preset drying pressure range; and the third early warning subunit sends out an alarm prompt of emergency shutdown if the real-time rotating speed is greater than the second preset rotating speed.
2. The sludge drying treatment system with accurate control of oxygen content according to claim 1, wherein the safety state discrimination module comprises a first discrimination module and a second discrimination module; The first judging module is used for sending out a first prevention and control state signal when the real-time oxygen content monitored by any one of the oxygen content probes is greater than a first preset threshold value; the second judging module is used for sending out a second prevention and control state signal when the real-time oxygen content monitored by each oxygen content probe is smaller than or equal to a first preset threshold value.
3. The sludge drying treatment system with the accurate control of the oxygen content according to claim 1, wherein the protection effect monitoring module comprises a leakage analysis unit and a parameter optimization unit; The leakage analysis unit is used for determining whether a continuous leakage point exists according to a comparison result of the real-time oxygen content and a first preset threshold value, and determining the area where the continuous leakage point exists according to the real-time oxygen content and the real-time response time of each oxygen content probe when the continuous leakage point exists; The parameter optimization unit is used for sending a positioning alarm signal according to the type of the area where the continuous leakage point is located or optimizing the operation parameters of the induced draft fan according to the comparison result of the operation air quantity and the theoretical air extraction quantity of the induced draft fan.
4. The sludge drying treatment system with precisely controlled oxygen content of claim 3, wherein the leakage analysis unit comprises a leakage determination subunit, a marking subunit, and a leakage point positioning subunit; the leakage determination subunit is used for determining whether a first recovery moment and a second exceeding moment exist on the corresponding oxygen content recovery curve based on the comparison result of the real-time oxygen content of any monitoring point and a first preset threshold value so as to determine whether a continuous leakage point exists; the marking subunit is used for marking the monitoring point as a target monitoring point when a continuous leakage point exists; and the leakage point positioning subunit determines the area where the continuous leakage point is positioned according to the real-time oxygen content and the real-time response time of the oxygen content probe of each target monitoring point.
5. A sludge drying treatment system with accurate control of oxygen content according to claim 3, wherein the parameter optimization unit comprises a matching analysis subunit and a parameter optimization subunit; the matching analysis subunit is used for analyzing the real-time matching degree of the induced draft fan and the theoretical extraction amount required by the current evaporated moisture and leakage gas to obtain an analysis result; And the parameter optimization subunit is used for determining whether to adjust the rotation speed of the induced draft fan according to the analysis result.
6. The sludge drying treatment system with precisely controlled oxygen content according to claim 1, wherein the oxygen content monitoring module further comprises a combustible gas detector and a pressure sensor; The combustible gas detector is arranged on the upper part of the drying equipment or an exhaust gas outlet pipeline and is used for monitoring the concentration of the combustible gas; The pressure sensor is arranged inside the drying equipment and used for monitoring the real-time drying pressure inside the drying equipment.

Description

Sludge drying treatment system capable of accurately controlling oxygen content Technical Field The invention relates to the technical field of sludge drying treatment, in particular to a sludge drying treatment system capable of accurately controlling oxygen content. Background The powdered sludge belongs to combustible dust, when the powdered sludge is dispersed in air to form a dust-air mixture, the powder is in danger of dust explosion when encountering an ignition source, dust generated after drying the sludge is suspended in the air in proper concentration to form dust cloud, if the dust concentration is higher than the lowest explosion lower limit concentration, the powder is in danger of dust explosion, a certain oxygen content is the basis of burning the dust, and when the oxygen content reaches enough concentration, the powder is in danger of dust explosion, and in the sludge drying process, the links of dust explosion accidents are mainly in a main dryer, a dust collecting and treating device, a granulating device and a final treating device, and the reasons of dust explosion are often caused by cross superposition and accumulation of multiple factors The Chinese patent publication No. CN103034184A discloses a safety control system of a sludge heat drying dry material bin, which is provided with an online instrument group and comprises an online temperature sensor, an online pressure transmitter, an online oxygen content probe, an online carbon monoxide detection probe, a guided wave radar material level gauge for measuring the material level height in the dry material bin and an online material level switch, wherein a nitrogen pipeline and an automatic control valve are also arranged in the dry material bin, a PLC control unit and an upper computer controller are arranged, and the control method comprises 1) micro-positive pressure inert environment control, 2) smoldering early warning control, 3) material level control and 4) alarm operation, so that the existing drying treatment system control technology lacks an intelligent safety barrier caused by single oxygen content alarm and is low in safety protection by actively diagnosing leakage and predicting the risk of combustible gas, identifying false reduction of the oxygen content caused by the accumulation of the combustible gas volume, diagnosing whether the root cause of the overheat of the accumulated sludge or the failure of the system seal caused by the too low rotation speed when false safety signals occur, and executing targeted measures. Disclosure of Invention Therefore, the invention provides a sludge drying treatment system capable of accurately controlling the oxygen content, which is used for solving the problems that the prior art fails to identify false reduction of the oxygen content caused by the volume aggregation of combustible gas through active diagnosis and combustible gas risk pre-judgment, the safety protection strategy is passive, hidden danger cannot be automatically eliminated from the source, and the intelligent level of the system is low. In order to achieve the above object, the present invention provides a sludge drying treatment system for precisely controlling oxygen content, comprising: the oxygen content monitoring module comprises oxygen content probes arranged at a plurality of monitoring points in the drying equipment and is used for acquiring the real-time oxygen content of the monitoring points; the safety state judging module is connected with the oxygen content monitoring module and is used for outputting a first prevention and control state signal or a second prevention and control state signal according to the comparison result of the real-time oxygen content and a first preset threshold value; the inert gas protection module is connected with the safety state judging module and is used for responding to the first prevention and control state signal to start an emergency protection mode so as to inject inert gas into the drying equipment; The protection effect monitoring module is respectively connected with the oxygen content monitoring module and the inert gas protection module and is used for executing continuous leakage diagnosis after the inert gas protection module is started, positioning a leakage area according to a diagnosis result and executing corresponding parameter optimization; And the safety state analysis module is connected with the safety state judging module and is used for responding to the second prevention and control state signal, and performing explosion risk analysis according to the real-time oxygen content and the combustible gas concentration so as to send out an early warning prompt. Further, the safety state judging module comprises a first judging module and a second judging module; The first judging module is used for sending out a first prevention and control state signal when the real-time oxygen content monitored by any one of the oxygen content probes is greater t