A method and system for online monitoring and control of slag hanging in gasifier

Abstract

The present invention relates to the field of gasifiers, and specifically to an online monitoring and control method and system for slag hanging in a gasifier, which detects the inner wall slag hanging state data and the slag pile state data of the slag discharge port of the gasifier under the supply of garbage conversion materials, thereby determining the effective slag hanging rate of the molten slag inside the gasifier, thereby adjusting the flux material supply parameters of the gasifier; detecting the slag hanging structure characteristics of the gasifier under the supply of garbage conversion materials and flux materials, and the abnormal slag hanging area on the inner wall of the gasifier; based on the dynamic change characteristics of the heat load of the water-cooled wall of the gasifier, judging whether a coking event will occur in the abnormal slag hanging area, thereby adjusting the oxygen delivery parameters of the gasifier. The present invention can accurately predict the slag hanging formation trend and structure in the gasifier without the need to pre-detect the coal ash melting point and slag viscosity temperature inside the gasifier, accurately control the environmental factors of slag hanging formation in the furnace in real time, and ensure that the slag hanging layer has good structural characteristics, so as to ensure that a dense and smooth slag hanging layer is formed on the inner wall of the gasifier.

Description

Technical Field

[0001] The present invention relates to the field of gasifiers, and in particular to an online monitoring and control method and system for slag hanging in a gasifier. Background Art

[0002] The coal gasification process is mainly realized through the gasifier, and the performance of the gasifier is of great significance to the stable operation of coal gasification. Among them, the gasifier slag has the following advantages during the operation of the gasifier: the gasifier slag can protect the inner wall of the gasifier, ensure the stable operation of the gasifier in the high temperature, high pressure and corrosive gas environment, reduce the probability of direct contact between the corrosive gas and the inner wall of the gasifier, and extend the service life of the gasifier; the gasifier slag can absorb and store heat, which helps to maintain the temperature stability in the gasifier, and the unreacted substances in the slag can continue to participate in the gasification reaction, improving the efficiency of the gasification reaction; the gasifier slag can also play the function of separating slag gas, and reduce the direct impact of the high temperature environment in the furnace on the gasifier by "using slag to fight slag", thereby improving the working reliability of the gasifier.

[0003] Through the above analysis, it can be known that gasifier slag is of great significance to improving the working performance of the gasifier, and the ash content, ash melting point and viscosity-temperature characteristics of coal quality are factors that affect the formation of gasifier slag. Among them, there is a correlation between the ash melting point and the viscosity-temperature characteristics. Too high or too low ash melting point cannot ensure that the slag has a suitable viscosity, which makes the slag flow too fast and it is not easy to form slag on the inner wall of the gasifier, so that a smooth and dense slag layer cannot be formed on the inner wall of the gasifier, and the slag mouth of the gasifier is blocked. The existing technology detects the ash melting point of the coal ash in the gasifier to obtain the viscosity-temperature curve of the slag, thereby quantitatively determining the viscosity of the slag inside the gasifier, and providing a reliable reference for adjusting the ash melting point of the coal ash. However, the above method can only detect the ash melting point of the coal ash in the local area of ​​the furnace, and the workload of viscosity-temperature curve fitting is large, and it is not possible to quickly and comprehensively determine the ash melting point state of the global range in the furnace. It can be seen that how to accurately predict the slag formation trend and structure in the gasifier without the need to pre-detect the ash melting point and viscosity-temperature state of the coal ash inside the gasifier is of great significance for real-time regulation of the slag formation conditions in the furnace and ensuring that the slag layer has good structural characteristics, which is conducive to improving the working performance of the gasifier. Summary of the invention

[0004] In order to accurately predict the formation trend and structure of slag in a gasifier without the need to detect the ash melting point and slag viscosity temperature in the gasifier in advance, to accurately control the environmental factors of slag formation in the furnace in real time and to ensure that the slag layer has good structural characteristics, and to ensure that a dense and smooth slag layer is formed on the inner wall of the gasifier in the whole range, the present invention provides a method for online monitoring and control of slag in a gasifier, the method comprising the following steps:

[0005] Detect and identify the gasifier to obtain the inner wall slag state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials; determine the effective slag rate of the molten slag inside the gasifier based on the inner wall slag state data and the slag accumulation state data of the slag discharge port;

[0006] Based on the effective slag rate, adjusting the flux material supply parameters of the gasifier; detecting and identifying the gasifier to obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and flux materials, so as to determine the abnormal slag area on the inner wall of the gasifier;

[0007] The dynamic change characteristics of the water-cooled wall heat load of the gasifier are obtained; based on the abnormal slag area and the dynamic change characteristics of the water-cooled wall heat load, whether a coking event will occur in the abnormal slag area is determined; based on the judgment result of the coking event in the abnormal slag area, the oxygen delivery parameters of the gasifier are adjusted.

[0008] Preferably, the gasifier is detected and identified to obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials, specifically:

[0009] Thermal infrared imaging is performed on the gasifier to obtain the inner wall slag deposition distribution status data and the slag accumulation distribution status data at the slag discharge port of the gasifier when supplied with garbage conversion materials; wherein the inner wall slag deposition distribution status data include the slag deposition amount change data of the inner wall surface of the gasifier in the global range; the slag distribution status data of the slag discharge port include the slag accumulation amount change data of the slag discharge port of the gasifier in the global range.

[0010] Preferably, the effective slag rate of the molten slag inside the gasifier is determined based on the inner wall slag state data and the slag accumulation state data at the slag discharge port, specifically:

[0011] The inner wall slag deposition state data is analyzed for time domain changes and spatial domain changes to obtain the slag rate characteristics of the slag inside the gasifier during the flow process; wherein the slag rate characteristics refer to the slag generation rate of the slag amount per unit area of ​​the inner wall surface area when the slag inside the gasifier flows; the slag accumulation state data of the slag discharge port is analyzed to obtain the viscosity time domain change characteristics of the slag inside the gasifier during the flow process;

[0012] Based on the time-domain variation characteristics of the viscosity, the slag efficiency characteristics are corrected to obtain the effective slag rate of the slag inside the gasifier; wherein the effective slag rate refers to the ratio between the amount of slag that is maintained for more than a preset time length when the slag inside the gasifier flows through a unit area of ​​the inner wall surface area to the amount of slag initially formed on the inner wall surface area.

[0013] Preferably, based on the effective slag rate, the flux material supply parameters of the gasifier are adjusted; the gasifier is detected and identified to obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and flux materials, so as to determine the abnormal slag area on the inner wall of the gasifier, specifically:

[0014] Based on the effective slag rate, predict the increase in slag thickness per unit area of ​​the inner wall surface area of ​​the gasifier in a future preset time interval; based on the increase in slag thickness, adjust the flux material supply rate and flux material supply transmission speed to the gasifier;

[0015] Thermal imaging is performed on the gasifier to obtain the surface structural characteristics of the slag hanging on the inner wall of the gasifier when the waste conversion material and the fluxing material are supplied; wherein the surface structural characteristics of the slag hanging on the inner wall include the density characteristics and the roughness characteristics of the slag surface formed inside the gasifier; based on the surface structural characteristics of the slag hanging on the inner wall, the abnormal slag hanging area on the inner wall of the gasifier is determined; wherein the abnormal slag hanging area includes the abnormal slag hanging surface density area and the abnormal slag hanging surface roughness area.

[0016] Preferably, the step of acquiring the dynamic change characteristics of the water-cooled wall heat load of the gasifier; judging whether a coking event will occur in the abnormal slag area based on the abnormal slag area and the dynamic change characteristics of the water-cooled wall heat load; and adjusting the oxygen delivery parameters of the gasifier based on the judgment result of the occurrence of the coking event in the abnormal slag area, specifically comprises:

[0017] Performing global temperature dynamic detection on the water-cooled wall of the gasifier to obtain global temperature dynamic change data of the water-cooled wall; analyzing the temperature dynamic change data to estimate the dynamic change characteristics of the heat load of the water-cooled wall; wherein the dynamic change characteristics of the heat load of the water-cooled wall refer to the heat distribution change characteristics inside the water-cooled wall of the gasifier;

[0018] Based on the dynamic change characteristics of the heat load of the water-cooled wall, it is determined whether the range of the water-cooled wall corresponding to the slag abnormal area is in a state of timely heat dissipation; if so, it is determined that a coking event will not occur in the slag abnormal area; if not, it is determined that a coking event will occur in the slag abnormal area, thereby reducing the oxygen delivery flow to the slag abnormal area where a coking event will occur.

[0019] On the other hand, the present invention provides a gasifier slag online monitoring and control system, the system comprising the following modules:

[0020] The first detection and identification module is used to detect and identify the gasifier, and obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials;

[0021] A furnace slag rate determination module, used to determine the effective slag rate of the molten slag inside the gasifier based on the inner wall slag state data and the slag accumulation state data at the slag discharge port;

[0022] A flux material supply adjustment module, used for adjusting flux material supply parameters to the gasifier based on the effective slag rate;

[0023] The second detection and identification module is used to detect and identify the gasifier, obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and fluxing materials, so as to determine the abnormal slag area on the inner wall of the gasifier;

[0024] A water-cooled wall heat load identification module, used to obtain the dynamic change characteristics of the water-cooled wall heat load of the gasifier;

[0025] The oxygen delivery parameter adjustment module is used to determine whether a coking event will occur in the abnormal slag area based on the dynamic change characteristics of the abnormal slag area and the water-cooled wall heat load; and adjust the oxygen delivery parameters of the gasifier based on the judgment result of the coking event in the abnormal slag area.

[0026] Preferably, the first detection and identification module is used to detect and identify the gasifier, and obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials, specifically:

[0027] Thermal infrared imaging is performed on the gasifier to obtain the inner wall slag deposition distribution status data and the slag accumulation distribution status data at the slag discharge port of the gasifier when supplied with garbage conversion materials; wherein the inner wall slag deposition distribution status data include the slag deposition amount change data of the inner wall surface of the gasifier in the global range; the slag distribution status data of the slag discharge port include the slag accumulation amount change data of the slag discharge port of the gasifier in the global range.

[0028] Preferably, the furnace slag rate determination module is used to determine the effective slag rate of the molten slag inside the gasifier based on the inner wall slag state data and the slag accumulation state data of the slag discharge port, specifically:

[0029] The inner wall slag deposition state data is analyzed for time domain changes and spatial domain changes to obtain the slag rate characteristics of the slag inside the gasifier during the flow process; wherein the slag rate characteristics refer to the slag generation rate of the slag amount per unit area of ​​the inner wall surface area when the slag inside the gasifier flows; the slag accumulation state data of the slag discharge port is analyzed to obtain the viscosity time domain change characteristics of the slag inside the gasifier during the flow process;

[0030] Based on the time-domain variation characteristics of the viscosity, the slag efficiency characteristics are corrected to obtain the effective slag rate of the slag inside the gasifier; wherein the effective slag rate refers to the ratio between the amount of slag that is maintained for more than a preset time length when the slag inside the gasifier flows through a unit area of ​​the inner wall surface area to the amount of slag initially formed on the inner wall surface area.

[0031] Preferably, the flux material supply adjustment module is used to adjust the flux material supply parameters of the gasifier based on the effective slag rate, specifically:

[0032] Based on the effective slag rate, predict the increase in slag thickness per unit area of ​​the inner wall surface area of ​​the gasifier in a future preset time interval; based on the increase in slag thickness, adjust the flux material supply rate and flux material supply transmission speed to the gasifier;

[0033] The second detection and identification module is used to detect and identify the gasifier, obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and fluxing materials, and thereby determine the abnormal slag area on the inner wall of the gasifier, specifically:

[0034] Thermal imaging is performed on the gasifier to obtain the surface structural characteristics of the slag hanging on the inner wall of the gasifier when the waste conversion material and the fluxing material are supplied; wherein the surface structural characteristics of the slag hanging on the inner wall include the density characteristics and the roughness characteristics of the slag surface formed inside the gasifier; based on the surface structural characteristics of the slag hanging on the inner wall, the abnormal slag hanging area on the inner wall of the gasifier is determined; wherein the abnormal slag hanging area includes the abnormal slag hanging surface density area and the abnormal slag hanging surface roughness area.

[0035] Preferably, the water-cooled wall heat load identification module is used to obtain the dynamic change characteristics of the water-cooled wall heat load of the gasifier, specifically:

[0036] Performing global temperature dynamic detection on the water-cooled wall of the gasifier to obtain global temperature dynamic change data of the water-cooled wall; analyzing the temperature dynamic change data to estimate the dynamic change characteristics of the heat load of the water-cooled wall; wherein the dynamic change characteristics of the heat load of the water-cooled wall refer to the heat distribution change characteristics inside the water-cooled wall of the gasifier;

[0037] The oxygen delivery parameter adjustment module is used to determine whether a coking event will occur in the abnormal slag area based on the characteristics of the dynamic change of the abnormal slag area and the heat load of the water-cooled wall; and adjust the oxygen delivery parameters of the gasifier based on the judgment result of the coking event in the abnormal slag area, specifically:

[0038] Based on the dynamic change characteristics of the heat load of the water-cooled wall, it is determined whether the range of the water-cooled wall corresponding to the slag abnormal area is in a state of timely heat dissipation; if so, it is determined that a coking event will not occur in the slag abnormal area; if not, it is determined that a coking event will occur in the slag abnormal area, thereby reducing the oxygen delivery flow to the slag abnormal area where a coking event will occur.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The gasifier is detected and identified to obtain the inner wall slag state data and the slag accumulation state data of the gasifier under the supply of garbage conversion materials; based on the inner wall slag state data and the slag accumulation state data of the slag discharge port, the effective slag rate of the slag inside the gasifier is determined. By detecting and analyzing the slag formation on the inner wall surface of the gasifier and the slag accumulation state at the slag discharge port of the gasifier, the fluidity and viscosity change characteristics of the garbage conversion materials after gasification in the gasifier can be directly and comprehensively identified. For this purpose, thermal infrared imaging is performed on the gasifier to obtain the thermal infrared image of the inner wall surface and the global image of the slag discharge port of the gasifier when the input garbage conversion materials are supplied; then the thermal infrared image of the inner wall surface and the global image of the slag discharge port are identified and analyzed to obtain the inner wall slag deposition distribution state data of the gasifier and the slag accumulation distribution state data of the slag discharge port, which provides a reliable basis for further identification and determination of the viscosity characteristics and slag formation efficiency characteristics of the slag formed by the garbage conversion materials inside the gasifier. Based on the slag status data of the inner wall and the slag accumulation status data of the slag discharge port, the slag that can be maintained for a long time formed on the inner wall surface of the gasifier is determined, which provides a reference for the subsequent judgment that the melting point of the waste conversion material currently supplied to the gasifier is sufficient to support the molten slag after gasification to stably and continuously form a structurally reliable slag layer on the inner wall surface of the gasifier.

[0041] Based on the effective slag rate, the flux material supply parameters of the gasifier are adjusted; the gasifier is detected and identified to obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and flux materials, so as to determine the abnormal slag area on the inner wall of the gasifier. Based on the above effective slag rate, the increase in slag thickness per unit area of ​​the inner wall surface area inside the gasifier in the future preset time interval is predicted, and by dynamically adjusting the flux material supply rate and flux material supply transmission speed to the gasifier, the input flux material can be fully and evenly mixed with the garbage conversion material in the gasifier, ensuring that the melting point of the garbage conversion material changes to a suitable melting point range, improving the slag formed by the gasification of the garbage conversion material to have sufficient viscosity to adhere to the inner wall surface of the gasifier, and improving the slag efficiency and stability of the inner wall surface.

[0042] The dynamic change characteristics of the heat load of the water-cooled wall of the gasifier are obtained; based on the abnormal slag area and the dynamic change characteristics of the heat load of the water-cooled wall, it is judged whether a coking event will occur in the abnormal slag area; based on the judgment result of the coking event in the abnormal slag area, the oxygen delivery parameters of the gasifier are adjusted. In order to avoid excessive heat load in the water-cooled wall area corresponding to the abnormal slag area, which in turn causes slag coking in the abnormal slag area, based on the internal heat distribution change characteristics of the water-cooled wall of the gasifier, it is judged whether the range of the water-cooled wall corresponding to the abnormal slag area is in a state of timely heat dissipation, so as to judge whether a coking event will occur in the abnormal slag area. In addition, by reducing the oxygen delivery flow rate to the abnormal slag area, the gasification reaction efficiency of the abnormal slag area is suppressed, and further coking degradation of the abnormal slag area is avoided, so as to ensure that a dense and smooth slag layer is formed on the global inner wall of the gasifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work. Among them:

[0044] Figure 1 The present invention provides a flow chart of a method for online monitoring and controlling slag hanging in a gasifier.

[0045] Figure 2 It is a structural diagram of a gasifier slag online monitoring and control system provided by the present invention. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention rather than all structures are shown in the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] The terms "including" and "having" and any variations thereof in the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] See also Figure 1 As shown, the present invention provides a method for online monitoring and control of slag hanging in a gasifier, the method comprising the following steps:

[0050] S100, detecting and identifying the gasifier, obtaining the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials; based on the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port, determining the effective slag hanging rate of the molten slag inside the gasifier.

[0051] Furthermore, the gasifier is detected and identified to obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials, specifically:

[0052] Thermal infrared imaging is performed on the gasifier to obtain the inner wall slag deposition distribution status data and the slag accumulation distribution status data at the slag discharge port of the gasifier under the supply of garbage conversion materials; wherein the inner wall slag deposition distribution status data include the slag deposition amount change data of the inner wall surface of the gasifier in the global range; the slag distribution status data of the slag discharge port include the slag accumulation amount change data of the slag discharge port of the gasifier in the global range.

[0053] The existing gasifiers all convert coal powder into molten slag by gasifying coal powder in the furnace, so that the molten slag adheres to the inner wall of the gasifier to form a slag layer. In view of the relatively simple composition of coal powder, the ash melting points of different types of coal powder are not much different. When the slag layer is formed on the inner wall of the furnace by coal ash gasification, it is only necessary to pre-determine the ash melting point of the coal powder to fix the flux material addition method, adjust the actual ash melting point of the coal powder in the gasifier, and ensure that a slag layer with a suitable structural thickness is formed on the inner wall surface. However, in actual work, in order to save the amount of coal powder used, garbage conversion materials have been used to carry out gasification reaction in the gasifier to form a slag layer on the inner wall surface of the furnace. Among them, the garbage conversion materials can be but are not limited to solid materials that are difficult to handle, such as construction waste, sand and gravel, and shells, which are selected from domestic waste. The above solid materials are crushed to obtain powdered solid materials. This can not only improve the recycling efficiency of domestic waste, but also make full use of the higher mechanical strength of the above solid materials so that the formed slag layer has good impact resistance. However, the sources of domestic waste are diverse, so the components of the above solid materials in the domestic waste collected each time are different (that is, the proportions of materials such as construction waste, sand and gravel, and shells are different), resulting in different melting points of the waste materials generated each time. Considering that the surface area of ​​the inner wall of the gasifier is large, it is necessary to input the waste conversion materials into the gasifier for gasification reaction multiple times to ensure that a uniform and solid slag layer is formed on the entire surface of the inner wall of the gasifier. However, the composition of the waste conversion materials input into the gasifier each time is quite different, and it is impossible to ensure that the waste conversion materials input into the gasifier each time can efficiently and stably form a slag layer on the inner wall surface.

[0054] If the existing technology is used to directly detect the melting point of the garbage conversion material input into the gasifier each time to determine the viscosity-temperature curve of the slag formed after the material is melted, it will not only increase the manpower and time cost of inputting the garbage conversion material into the gasifier for melting point detection each time, but also fail to ensure that slag is continuously formed inside the gasifier and that the viscosity-temperature curve truly reflects the viscosity characteristics of the slag formed by the garbage conversion material inside the gasifier. It can be seen that the existing method of ash melting point detection and viscosity-temperature curve fitting inside the gasifier is not suitable for the scenario of using garbage conversion materials to gasify slag in the gasifier. Through the above analysis, it can be known that when the melting point of the garbage conversion material supplied to the gasifier is within the appropriate range, the slag formed after the garbage conversion material is gasified also has the appropriate viscosity characteristics, and the above slag will flow at an appropriate speed in the gasifier and evenly adhere to the inner wall surface of the gasifier to form slag; when the melting point of the garbage conversion material supplied to the gasifier exceeds the appropriate range, the slag formed after the garbage conversion material is gasified will show a faster fluidity, and cannot form a continuous and effective contact with the inner wall surface of the gasifier, and cannot form slag on the inner wall surface. Instead, it will quickly deposit around the slag discharge port of the gasifier, which is easy to cause slag accumulation at the slag discharge port. Therefore, by detecting and analyzing the slag formation on the inner wall surface of the gasifier and the slag accumulation at the slag discharge port of the gasifier, the fluidity and viscosity change characteristics of the garbage conversion material after gasification in the gasifier can be directly and comprehensively identified. To this end, thermal infrared imaging of the gasifier was carried out to obtain a thermal infrared image of the inner wall surface and a global image of the slag discharge port of the gasifier when the input garbage conversion material is supplied; then the thermal infrared image of the inner wall surface and the global image of the slag discharge port were identified and analyzed to obtain the distribution status data of slag deposition on the inner wall of the gasifier and the distribution status data of slag accumulation at the slag discharge port, and the changes in slag deposition on the inner wall surface and the slag discharge port of the gasifier were comprehensively and accurately characterized, thereby obtaining the global change data of slag deposition amount on the inner wall surface of the gasifier and the global change data of slag accumulation amount at the slag discharge port of the gasifier, which provides a reliable basis for further identification and determination of the viscosity characteristics and slag formation efficiency characteristics of the slag formed by the garbage conversion material inside the gasifier.

[0055] Furthermore, based on the inner wall slag state data and the slag accumulation state data at the slag discharge port, the effective slag rate of the slag inside the gasifier is determined, specifically:

[0056] The slag deposition state data of the inner wall is analyzed for time domain and space domain changes to obtain the slag rate characteristics of the slag inside the gasifier during the flow process; the slag rate characteristics refer to the slag generation rate of the slag flowing through the unit area of ​​the inner wall surface area of ​​the gasifier; the slag accumulation state data at the slag discharge port are analyzed to obtain the viscosity time domain change characteristics of the slag inside the gasifier during the flow process;

[0057] Based on the time-domain variation characteristics of viscosity, the slag efficiency characteristics are corrected to obtain the effective slag rate of the slag inside the gasifier; wherein the effective slag rate refers to the ratio between the amount of slag that is maintained for more than a preset time length when the slag flows through a unit area of ​​the inner wall surface area inside the gasifier to the amount of slag initially formed on the inner wall surface area.

[0058] The slag state data of the inner wall of the gasifier characterizes the amount of slag deposition at different positions on the inner wall of the gasifier. The slag formation principle of the inner wall of the gasifier is that the slag in the gasifier contacts the inner wall of the gasifier during the flow process, and adheres to the inner wall due to its own viscosity characteristics during the contact process. The larger the amount of slag formed by the slag passing through the inner wall surface per unit area during the flow of the slag inside the gasifier, the better the viscosity characteristics of the slag, and the more the melting point of the slag itself matches the preset appropriate melting point range. By analyzing the time domain and spatial domain changes of the inner wall slag deposition state data, the slag generation rate of the inner wall surface area per unit area of ​​the slag inside the gasifier during the flow process is obtained, thereby quantifying the speed of slag generation on the inner wall surface of the gasifier during the current waste conversion material supply input process, and providing a benchmark for the subsequent judgment of whether the melting point of the waste conversion material inside the gasifier can make the corresponding slag have good viscosity characteristics. In addition, the inner wall surface of the gasifier is relatively large, and the slag rate characteristics obtained from the analysis of the inner wall slag deposition state data cannot accurately quantify the actual viscosity characteristics of the slag. Considering that if the viscosity of the slag is small, it will not be able to effectively adhere to the inner wall surface during the flow inside the gasifier and will be directly discharged from the slag discharge port. When the slag flows to the slag discharge port, the temperature drops suddenly, and it will cool and accumulate around the slag discharge port. The greater the slag accumulation rate at the slag discharge port, the smaller the viscosity of the slag. That is, by analyzing the slag accumulation state data at the slag discharge port, the viscosity time domain change characteristics of the slag inside the gasifier during the flow process (that is, the viscosity change characteristics over time) can be inverted. By utilizing the above-mentioned viscosity time-domain variation characteristics, the slag generation rate of the molten slag flowing through a unit area of ​​the inner wall surface area inside the gasifier is corrected, and the ratio of the slag amount that is maintained for more than a preset time length when the molten slag flows through a unit area of ​​the inner wall surface area inside the gasifier to the slag amount initially formed on the inner wall surface area is obtained. In this way, the slag formed on the inner wall surface of the gasifier that can be maintained for a long time can be determined, which provides a reference for the subsequent judgment that the melting point of the waste conversion material currently supplied to the gasifier is sufficient to support the gasified slag to stably and continuously form a structurally reliable slag layer on the inner wall surface of the gasifier.

[0059] S200, based on the effective slag rate, adjusting the flux material supply parameters of the gasifier; detecting and identifying the gasifier, obtaining the slag structure characteristics of the gasifier under the supply of garbage conversion materials and flux materials, so as to determine the abnormal slag area on the inner wall of the gasifier.

[0060] Furthermore, based on the effective slag rate, the flux material supply parameters of the gasifier are adjusted; the gasifier is detected and identified to obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and flux materials, so as to determine the abnormal slag area on the inner wall of the gasifier, specifically:

[0061] Based on the effective slag rate, predict the increase in slag thickness per unit area of ​​the inner wall surface of the gasifier in a preset time interval in the future; based on the increase in slag thickness, adjust the flux material supply rate and flux material supply transmission speed to the gasifier;

[0062] Thermal imaging is performed on the gasifier to obtain the surface structural characteristics of the slag hanging on the inner wall of the gasifier when the waste conversion material and the fluxing material are supplied; wherein, the surface structural characteristics of the slag hanging on the inner wall include the density characteristics and the roughness characteristics of the slag surface formed inside the gasifier; based on the surface structural characteristics of the slag hanging on the inner wall, the abnormal slag hanging area on the inner wall of the gasifier is determined; wherein, the abnormal slag hanging area includes the abnormal slag hanging surface density area and the abnormal slag hanging surface roughness area.

[0063] Considering that the effective slag rate refers to the ratio between the amount of slag that is maintained for more than a preset time length when the slag flows through the unit area of ​​the inner wall surface of the gasifier and the amount of slag initially formed on the inner wall surface, it represents the proportion of slag that adheres to the inner wall surface and adheres for a long time (without falling off) after the slag flows through the inner wall surface. Only the slag that adheres to the inner wall surface for a long time can gradually deposit and effectively cover the inner wall surface. For this reason, based on the above effective slag rate, the increase in slag thickness per unit area of ​​the inner wall surface of the gasifier in the future preset time interval is predicted, and the above increase in slag thickness is compared with the preset thickness increase threshold. If the above increase in slag thickness is greater than or equal to the preset thickness increase threshold, it is judged that the melting point of the waste conversion material currently supplied to the gasifier is sufficient to maintain the stable deposition and formation of slag on the inner wall surface; if the above increase in slag thickness is less than the preset thickness increase threshold, it is judged that the melting point of the waste conversion material currently supplied to the gasifier is sufficient to maintain the stable deposition and formation of slag on the inner wall surface. The point is not enough to maintain the stable deposition and formation of slag on the inner wall surface. At this time, the flux material supply rate and flux material supply and transmission speed of the gasifier are adjusted, for example, the flux material supply rate and flux material supply and transmission speed can be increased or decreased; wherein, the flux material can be but not limited to limestone and / or silicon dioxide; the flux material supply rate refers to the weight of the flux material supplied to the gasifier per unit time; the flux material supply and transmission speed refers to the movement speed of the flux material supplied to the gasifier in the furnace. By dynamically adjusting the flux material supply rate and flux material supply and transmission speed, the input flux material can be fully and evenly mixed with the waste conversion material in the gasifier, ensuring that the melting point of the waste conversion material changes to a suitable melting point range, improving the slag formed by the gasification of the waste conversion material to have sufficient viscosity to adhere to the inner wall surface of the gasifier, and improving the slag hanging efficiency and stability of the inner wall surface.

[0064] In addition, the structure of the slag layer adhered and deposited on the inner wall surface of the gasifier affects the protective performance of the slag layer on the inner wall surface. Generally speaking, the denser the slag layer structure and the smoother the surface, the more effectively it can resist the impact of the high temperature in the gasifier on the inner wall surface, and it is also more conducive to the slag layer to insulate the furnace environment; if there are many gaps inside the slag layer and it cannot form a dense structure or the surface roughness of the slag layer is large, the hot air flow in the gasifier will penetrate into the slag layer, which will have an adverse effect on the stability of the slag layer structure and cause the slag layer to disintegrate, and will also make the inner wall surface directly contact with the high-temperature hot air flow, causing thermal shock to the gasifier. Therefore, it is also necessary to detect and identify the slag layer structure on the inner wall surface of the gasifier. Specifically, thermal imaging of the gasifier is performed to obtain the inner wall slag surface image of the gasifier under the supply of garbage conversion materials and fluxing materials, and then the above inner wall slag surface image is identified and analyzed to obtain the density characteristics and roughness characteristics of the slag surface formed inside the gasifier. In addition, based on the density characteristics and roughness characteristics of the slag surface formed inside the gasifier, areas on the inner wall surface of the gasifier where the slag density is less than a preset density threshold or the roughness is greater than a preset roughness threshold are identified as abnormal slag areas on the inner wall surface, thereby locating and identifying areas with abnormal slag surface density and abnormal slag surface roughness on the inner wall surface, providing a reliable basis for subsequent targeted adjustment of the oxygen supply status inside the gasifier, thereby improving the slag layer structure on the inner wall surface, ensuring that the slag layer comprehensively and tightly covers the inner wall surface, and providing good protection for the inner wall surface.

[0065] S300, obtaining the dynamic change characteristics of the water-cooled wall heat load of the gasifier; judging whether a coking event will occur in the abnormal slag area based on the abnormal slag area and the dynamic change characteristics of the water-cooled wall heat load; adjusting the oxygen delivery parameters of the gasifier based on the judgment result of the coking event in the abnormal slag area.

[0066] Furthermore, the dynamic change characteristics of the water-cooled wall heat load of the gasifier are obtained; based on the abnormal slag area and the dynamic change characteristics of the water-cooled wall heat load, it is judged whether a coking event will occur in the abnormal slag area; based on the judgment result of the coking event in the abnormal slag area, the oxygen delivery parameters of the gasifier are adjusted, specifically:

[0067] Perform global temperature dynamic detection on the water-cooled wall of the gasifier to obtain the global temperature dynamic change data of the water-cooled wall; analyze the temperature dynamic change data to estimate the dynamic change characteristics of the water-cooled wall heat load; the dynamic change characteristics of the water-cooled wall heat load refer to the heat distribution change characteristics inside the water-cooled wall of the gasifier;

[0068] Based on the dynamic change characteristics of the water-cooled wall heat load, it is determined whether the range of the water-cooled wall corresponding to the slag abnormal area is in a state of timely heat dissipation; if so, it is determined that a coking event will not occur in the slag abnormal area; if not, it is determined that a coking event will occur in the slag abnormal area, thereby reducing the oxygen delivery flow to the slag abnormal area where a coking event will occur.

[0069] Through the above analysis, it can be seen that the abnormal slag areas such as the abnormal density area of ​​the slag surface and the abnormal roughness area of ​​the slag surface cannot effectively block the invasion of the hot air flow in the furnace. The hot air flow in the furnace will penetrate into the slag layer and directly contact the inner wall surface, resulting in an increase in the heat load of the water-cooled wall of the gasifier and the corresponding area of ​​the inner wall surface. When the corresponding area of ​​the water-cooled wall cannot dissipate the heat in time, the heat load of the corresponding area of ​​the water-cooled wall will in turn cause the corresponding slag layer to rise too high and produce coking. Once the slag layer is coked, the internal structure of the slag layer will be destroyed and unstable, and it is easy to fall off from the inner wall surface. In order to avoid the water-cooled wall corresponding to the abnormal slag area where the heat load is too large, which in turn causes the above abnormal slag area to coke, it is necessary to perform global temperature dynamic detection on the water-cooled wall of the gasifier to obtain the dynamic temperature change data of the global range of the water-cooled wall, so as to estimate the internal heat distribution change characteristics of the water-cooled wall of the gasifier (that is, the change characteristics of the internal heat size distribution of the water-cooled wall over time). Generally speaking, the longer the duration of a sub-range in the global range of the water-cooled wall is in the over-high temperature state, the greater the heat of the corresponding sub-range. Based on the heat distribution change characteristics inside the water-cooled wall of the gasifier, it is determined whether the range of the water-cooled wall corresponding to the abnormal slag area is in a state of timely heat dissipation, so as to determine whether a coking event will occur in the abnormal slag area; wherein, the determination of whether the range of the water-cooled wall corresponding to the abnormal slag area is in a state of timely heat dissipation can be based on the heat distribution change characteristics inside the water-cooled wall of the gasifier, and whether the temperature of the range of the water-cooled wall corresponding to the abnormal slag area can be reduced by a preset temperature difference within a predetermined time interval. And when a coking event occurs in the abnormal slag area, the oxygen delivery flow rate to the abnormal slag area where the coking event will occur is reduced, and by reducing the oxygen delivery flow rate to the abnormal slag area, the gasification reaction efficiency of the abnormal slag area is suppressed, and the above-mentioned abnormal slag area is prevented from further coking and degradation, so as to ensure that a dense and smooth slag layer is formed on the global range of the inner wall of the gasifier.

[0070] See also Figure 2 As shown, the present invention provides a gasifier slag online monitoring and control system, which includes the following modules:

[0071] The first detection and identification module is used to detect and identify the gasifier, and obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials;

[0072] A furnace slag rate determination module is used to determine the effective slag rate of the molten slag inside the gasifier based on the inner wall slag state data and the slag accumulation state data at the slag discharge port;

[0073] A flux material supply adjustment module, used to adjust flux material supply parameters to the gasifier based on the effective slag rate;

[0074] The second detection and identification module is used to detect and identify the gasifier, obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and fluxing materials, so as to determine the abnormal slag area on the inner wall of the gasifier;

[0075] The water-cooled wall heat load identification module is used to obtain the dynamic change characteristics of the water-cooled wall heat load of the gasifier;

[0076] The oxygen delivery parameter adjustment module is used to determine whether a coking event will occur in the abnormal slag area based on the dynamic change characteristics of the abnormal slag area and the water-cooled wall heat load; based on the judgment result of the coking event in the abnormal slag area, adjust the oxygen delivery parameters of the gasifier.

[0077] Furthermore, the first detection and identification module is used to detect and identify the gasifier, and obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials, specifically:

[0078] Thermal infrared imaging is performed on the gasifier to obtain the inner wall slag deposition distribution status data and the slag accumulation distribution status data at the slag discharge port of the gasifier under the supply of garbage conversion materials; wherein the inner wall slag deposition distribution status data include the slag deposition amount change data of the inner wall surface of the gasifier in the global range; the slag distribution status data of the slag discharge port include the slag accumulation amount change data of the slag discharge port of the gasifier in the global range.

[0079] Furthermore, the furnace slag rate determination module is used to determine the effective slag rate of the molten slag inside the gasifier based on the inner wall slag state data and the slag accumulation state data at the slag discharge port, specifically:

[0080] The slag deposition state data of the inner wall is analyzed for time domain and space domain changes to obtain the slag rate characteristics of the slag inside the gasifier during the flow process; the slag rate characteristics refer to the slag generation rate of the slag flowing through the unit area of ​​the inner wall surface area of ​​the gasifier; the slag accumulation state data at the slag discharge port are analyzed to obtain the viscosity time domain change characteristics of the slag inside the gasifier during the flow process;

[0081] Based on the time-domain variation characteristics of viscosity, the slag efficiency characteristics are corrected to obtain the effective slag rate of the slag inside the gasifier; wherein the effective slag rate refers to the ratio between the amount of slag that is maintained for more than a preset time length when the slag flows through a unit area of ​​the inner wall surface area inside the gasifier to the amount of slag initially formed on the inner wall surface area.

[0082] Furthermore, the flux material supply adjustment module is used to adjust the flux material supply parameters of the gasifier based on the effective slag rate, specifically:

[0083] Based on the effective slag rate, predict the increase in slag thickness per unit area of ​​the inner wall surface of the gasifier in a preset time interval in the future; based on the increase in slag thickness, adjust the flux material supply rate and flux material supply transmission speed to the gasifier;

[0084] The second detection and identification module is used to detect and identify the gasifier, obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and fluxing materials, and thereby determine the abnormal slag area on the inner wall of the gasifier, specifically:

[0085] Thermal imaging is performed on the gasifier to obtain the surface structural characteristics of the slag hanging on the inner wall of the gasifier when the waste conversion material and the fluxing material are supplied; wherein, the surface structural characteristics of the slag hanging on the inner wall include the density characteristics and the roughness characteristics of the slag surface formed inside the gasifier; based on the surface structural characteristics of the slag hanging on the inner wall, the abnormal slag hanging area on the inner wall of the gasifier is determined; wherein, the abnormal slag hanging area includes the abnormal slag hanging surface density area and the abnormal slag hanging surface roughness area.

[0086] Furthermore, the water-cooled wall heat load identification module is used to obtain the dynamic change characteristics of the water-cooled wall heat load of the gasifier, specifically:

[0087] Perform global temperature dynamic detection on the water-cooled wall of the gasifier to obtain the global temperature dynamic change data of the water-cooled wall; analyze the temperature dynamic change data to estimate the dynamic change characteristics of the water-cooled wall heat load; the dynamic change characteristics of the water-cooled wall heat load refer to the heat distribution change characteristics inside the water-cooled wall of the gasifier;

[0088] The oxygen delivery parameter adjustment module is used to determine whether a coking event will occur in the abnormal slag area based on the dynamic change characteristics of the abnormal slag area and the water-cooled wall heat load; based on the judgment result of the coking event in the abnormal slag area, the oxygen delivery parameters of the gasifier are adjusted, specifically:

[0089] Based on the dynamic change characteristics of the water-cooled wall heat load, it is determined whether the range of the water-cooled wall corresponding to the slag abnormal area is in a state of timely heat dissipation; if so, it is determined that a coking event will not occur in the slag abnormal area; if not, it is determined that a coking event will occur in the slag abnormal area, thereby reducing the oxygen delivery flow to the slag abnormal area where a coking event will occur.

[0090] The operation and effect of the gasifier slag online monitoring and control system of the present invention are corresponding to and consistent with the above-mentioned gasifier slag online monitoring and control method, and the gasifier slag online monitoring and control system will not be repeated here.

[0091] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by adding a necessary general hardware platform, and of course can also be implemented by combining hardware and software. Based on such an understanding, the above technical solution can essentially or in other words be embodied in the form of a computer product, and the present invention can be implemented in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it, and other embodiments may also be used. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for online monitoring and control of slag hanging in a gasifier, characterized in that: The method comprises the following steps: Detect and identify the gasifier to obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials; Based on the inner wall slag state data and the slag accumulation state data at the slag discharge port, the effective slag rate of the molten slag inside the gasifier is determined, which is specifically: The inner wall slag deposition state data is analyzed for time domain changes and spatial domain changes to obtain the slag rate characteristics of the slag inside the gasifier during the flow process; wherein the slag rate characteristics refer to the slag generation rate of the slag amount per unit area of ​​the inner wall surface area when the slag inside the gasifier flows; the slag accumulation state data of the slag discharge port is analyzed to obtain the viscosity time domain change characteristics of the slag inside the gasifier during the flow process; Based on the viscosity time-domain variation characteristics, the slagging efficiency characteristics are corrected to obtain the effective slagging rate of the slag inside the gasifier; wherein the effective slagging rate refers to the ratio between the amount of slagging that the slag inside the gasifier flows through a unit area of ​​the inner wall surface area for more than a preset time length and the amount of slagging initially formed on the inner wall surface area; Based on the effective slag rate, the flux material supply parameters of the gasifier are adjusted; the gasifier is detected and identified to obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and flux materials, so as to determine the abnormal slag area on the inner wall of the gasifier, which is specifically: Based on the effective slag rate, predict the increase in slag thickness per unit area of ​​the inner wall surface area of ​​the gasifier in a future preset time interval; based on the increase in slag thickness, adjust the flux material supply rate and flux material supply transmission speed to the gasifier; Thermal imaging recognition is performed on the gasifier to obtain the surface structural features of the inner wall slag of the gasifier under the supply of garbage conversion materials and fluxing materials; wherein the surface structural features of the inner wall slag include the density features and roughness features of the slag surface formed inside the gasifier; based on the surface structural features of the inner wall slag, an abnormal slag area on the inner wall of the gasifier is determined; wherein the abnormal slag area includes an abnormal slag surface density area and an abnormal slag surface roughness area; The dynamic change characteristics of the water-cooled wall heat load of the gasifier are obtained; based on the abnormal slag area and the dynamic change characteristics of the water-cooled wall heat load, whether a coking event will occur in the abnormal slag area is determined; based on the judgment result of the coking event in the abnormal slag area, the oxygen delivery parameters of the gasifier are adjusted.

2. The method according to claim 1, characterized in that The detection and identification of the gasifier is performed to obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials, specifically: Thermal infrared imaging is performed on the gasifier to obtain the inner wall slag deposition distribution status data and the slag accumulation distribution status data at the slag discharge port of the gasifier when supplied with garbage conversion materials; wherein the inner wall slag deposition distribution status data include the slag deposition amount change data of the inner wall surface of the gasifier in the global range; the slag distribution status data of the slag discharge port include the slag accumulation amount change data of the slag discharge port of the gasifier in the global range.

3. The method according to claim 1, characterized in that: The step of obtaining the dynamic change characteristics of the water-cooled wall heat load of the gasifier; judging whether a coking event will occur in the abnormal slag area based on the abnormal slag area and the dynamic change characteristics of the water-cooled wall heat load; and adjusting the oxygen delivery parameters of the gasifier based on the judgment result of the coking event in the abnormal slag area, specifically comprises: Performing global temperature dynamic detection on the water-cooled wall of the gasifier to obtain global temperature dynamic change data of the water-cooled wall; analyzing the temperature dynamic change data to estimate the dynamic change characteristics of the heat load of the water-cooled wall; wherein the dynamic change characteristics of the heat load of the water-cooled wall refer to the heat distribution change characteristics inside the water-cooled wall of the gasifier; Based on the dynamic change characteristics of the heat load of the water-cooled wall, it is determined whether the range of the water-cooled wall corresponding to the slag abnormal area is in a state of timely heat dissipation; if so, it is determined that a coking event will not occur in the slag abnormal area; if not, it is determined that a coking event will occur in the slag abnormal area, thereby reducing the oxygen delivery flow to the slag abnormal area where a coking event will occur.

4. A gasifier slag online monitoring and control system, characterized in that: The system includes the following modules: The first detection and identification module is used to detect and identify the gasifier, and obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials; The furnace slag rate determination module is used to determine the effective slag rate of the molten slag inside the gasifier based on the inner wall slag state data and the slag accumulation state data of the slag discharge port, which is specifically: The inner wall slag deposition state data is analyzed for time domain changes and spatial domain changes to obtain the slag rate characteristics of the slag inside the gasifier during the flow process; wherein the slag rate characteristics refer to the slag generation rate of the slag amount per unit area of ​​the inner wall surface area when the slag inside the gasifier flows; the slag accumulation state data of the slag discharge port is analyzed to obtain the viscosity time domain change characteristics of the slag inside the gasifier during the flow process; Based on the viscosity time-domain variation characteristics, the slagging efficiency characteristics are corrected to obtain the effective slagging rate of the slag inside the gasifier; wherein the effective slagging rate refers to the ratio between the amount of slagging that the slag inside the gasifier flows through a unit area of ​​the inner wall surface area for more than a preset time length and the amount of slagging initially formed on the inner wall surface area; The flux material supply adjustment module is used to adjust the flux material supply parameters of the gasifier based on the effective slag rate, which is specifically: Based on the effective slag rate, predict the increase in slag thickness per unit area of ​​the inner wall surface area of ​​the gasifier in a future preset time interval; based on the increase in slag thickness, adjust the flux material supply rate and flux material supply transmission speed to the gasifier; The second detection and identification module is used to detect and identify the gasifier, obtain the slag structure characteristics of the gasifier under the supply of garbage conversion materials and fluxing materials, and thereby determine the abnormal slag area on the inner wall of the gasifier, which is specifically: Thermal imaging recognition is performed on the gasifier to obtain the surface structural features of the inner wall slag of the gasifier under the supply of garbage conversion materials and fluxing materials; wherein the surface structural features of the inner wall slag include the density features and roughness features of the slag surface formed inside the gasifier; based on the surface structural features of the inner wall slag, an abnormal slag area on the inner wall of the gasifier is determined; wherein the abnormal slag area includes an abnormal slag surface density area and an abnormal slag surface roughness area; A water-cooled wall heat load identification module, used to obtain the dynamic change characteristics of the water-cooled wall heat load of the gasifier; The oxygen delivery parameter adjustment module is used to determine whether a coking event will occur in the abnormal slag area based on the dynamic change characteristics of the abnormal slag area and the water-cooled wall heat load; and adjust the oxygen delivery parameters of the gasifier based on the judgment result of the coking event in the abnormal slag area.

5. The system according to claim 4, characterized in that The first detection and identification module is used to detect and identify the gasifier, and obtain the inner wall slag hanging state data and the slag accumulation state data of the slag discharge port of the gasifier under the supply of garbage conversion materials, specifically: Thermal infrared imaging is performed on the gasifier to obtain the inner wall slag deposition distribution status data and the slag accumulation distribution status data at the slag discharge port of the gasifier when supplied with garbage conversion materials; wherein the inner wall slag deposition distribution status data include the slag deposition amount change data of the inner wall surface of the gasifier in the global range; the slag distribution status data of the slag discharge port include the slag accumulation amount change data of the slag discharge port of the gasifier in the global range.

6. The system according to claim 4, characterized in that The water-cooled wall heat load identification module is used to obtain the dynamic change characteristics of the water-cooled wall heat load of the gasifier, specifically: Performing global temperature dynamic detection on the water-cooled wall of the gasifier to obtain global temperature dynamic change data of the water-cooled wall; analyzing the temperature dynamic change data to estimate the dynamic change characteristics of the heat load of the water-cooled wall; wherein the dynamic change characteristics of the heat load of the water-cooled wall refer to the heat distribution change characteristics inside the water-cooled wall of the gasifier; The oxygen delivery parameter adjustment module is used to determine whether a coking event will occur in the abnormal slag area based on the dynamic change characteristics of the abnormal slag area and the water-cooled wall heat load; and adjust the oxygen delivery parameters of the gasifier based on the judgment result of the coking event in the abnormal slag area, specifically: Based on the dynamic change characteristics of the heat load of the water-cooled wall, it is determined whether the range of the water-cooled wall corresponding to the slag abnormal area is in a state of timely heat dissipation; if so, it is determined that a coking event will not occur in the slag abnormal area; if not, it is determined that a coking event will occur in the slag abnormal area, thereby reducing the oxygen delivery flow to the slag abnormal area where a coking event will occur.

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