Automatic heating coupling control method for coke oven

Abstract

The present application relates to a kind of coke oven automatic heating coupling control method, based on coke oven automatic heating coupling control system implementation, the coke oven automatic heating coupling control system includes automatic monitoring system, exhaust opening-closing device automatic regulating system and expert decision system;The automatic monitoring system includes coke cake automatic temperature measurement system, furnace top space temperature measurement system and small flue exhaust measurement system;Through expert decision system, the production data such as the coke cake temperature of the automatic measurement of external regulation coke oven, furnace top space temperature, exhaust temperature, exhaust oxygen content are coupled determination, and according to the determination result, exhaust opening-closing device is automatically regulated, so that the regulation of coke oven high direction heating is more timely, convenient, and then realize the automation, intelligentization of coke oven high direction heating regulation.

Description

Technical Field

[0001] This invention relates to the field of coke oven production technology, and in particular to an automatic heating coupling control method for coke ovens. Background Technology

[0002] The uniformity of vertical heating in a coke oven directly affects the maturity of the coke cake in the vertical direction and may lead to problems such as graphite buildup in the oven top space and smoke and fire during coke pushing. The uniformity of vertical heating in a coke oven can generally be adjusted using regulating bricks at the gas outlet in the vertical flue. However, since the temperature in the vertical flue can reach over 1400℃ and the adjustment distance is relatively long, adjustment is generally not performed during production. To address these issues, Chinese patent application CN 108728127A discloses a "low-NOx emission coke oven heating system using rich coal gas and its adjustment method," and Chinese patent application CN 108774537A discloses a "low-NOx emission reheating coke oven heating system and its adjustment method." Both systems modify the heating system so that the amount of combustion air or coal gas entering the bottom and middle / upper parts of the vertical flue can be independently and quantitatively adjusted at the cold end of the exhaust gas switch, thereby reducing the generation of nitrogen oxides. This type of externally adjusted coke oven has the advantages of simple and rapid adjustment.

[0003] Furthermore, to automate coke oven production, Chinese patent application CN 113278424 A discloses "An Automatically Adjustable Exhaust Gas On / Off Device," which, by controlling the opening and closing of internal regulating valves, can continuously and rapidly change the lean coal gas flow rate, the air inlet cross-section of the large and small air dampers, and the opening degree of the exhaust gas regulating flap, thereby achieving the purpose of automatically adjusting the coke oven heating gas flow rate. Chinese patent application CN107179129A discloses "A Coke Cake Temperature Detection System and Method for the Coking Process," which can automate coke cake temperature measurement.

[0004] The aforementioned patent documents all describe the automation systems related to the coke oven production process, but they are not related to each other. If the aforementioned automation systems can be integrated and the uniformity of high-altitude heating in the coke oven can be improved on this basis, it will have important practical significance for coke oven production. Summary of the Invention

[0005] This invention provides an automatic heating coupling control method for coke ovens. By using an expert judgment system to couple and judge production data such as coke cake temperature, oven top space temperature, exhaust gas temperature, and exhaust gas oxygen content of automatically measured externally controlled coke ovens, the method automatically adjusts the exhaust gas switch based on the judgment results. This makes the adjustment of the high-level heating of the coke oven more timely and convenient, thereby realizing the automation and intelligence of the high-level heating adjustment of the coke oven.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] An automatic heating coupling control method for a coke oven is disclosed. The coke oven is an externally controlled type, where the air supply to the vertical flue is regulated by an exhaust gas switch. Air entering from the bottom and upper parts of the vertical flue is preheated in corresponding regenerators, and the air flow is regulated by an air flow regulating device on the corresponding exhaust gas switch. The exhaust gas switch is also equipped with an exhaust gas flap to regulate the exhaust gas flow through the corresponding regenerator. A main exhaust gas flap is installed in either the branch flue or the main flue of the coke oven. The automatic heating coupling control method is based on an automatic heating coupling control system for the coke oven, which includes an automatic monitoring system, an automatic exhaust gas switch adjustment system, and an expert judgment system. The automatic monitoring system includes an automatic coke cake temperature measurement system. The system includes a furnace top space temperature measurement system and a small flue gas measurement system. Real-time production data measured by the automatic monitoring system, including coke cake temperature automatically measured by the coke cake automatic temperature measurement system, furnace top space temperature automatically measured by the furnace top space temperature measurement system, and flue gas temperature and oxygen content measured by the small flue gas measurement system, are all transmitted to the expert judgment system. The expert judgment system pre-sets allowable range values ​​for each evaluation parameter, including coke cake temperature, temperature difference between the upper, middle, and lower points of the coke cake, furnace top space temperature, flue gas temperature deviation between two adjacent regenerators, and oxygen content in the flue gas. The expert judgment system makes judgments based on the real-time production data and corresponding evaluation parameters, and issues instructions to the automatic flue gas switch adjustment system based on the judgment results to adjust the flue gas switch.

[0008] Furthermore, the expert judgment system's judgment method is as follows:

[0009] (1) When the temperature of the upper part of the coke cake is higher than that of the lower part, or the temperature of the furnace top space is higher than the set maximum temperature, or there is graphite accumulation in the furnace top space, the expert judgment system issues an adjustment command to increase the opening of the air flow regulating device of the bottom air corresponding to the exhaust gas switch and / or decrease the opening of the air flow regulating device of the middle and upper air corresponding to the exhaust gas switch, so as to increase the amount of air entering from the bottom of the self-supporting flue and / or decrease the amount of air entering from the middle and upper parts of the self-supporting flue.

[0010] When the temperature at the bottom of the coke cake is higher than that at the top, or the temperature at the top of the furnace is lower than the set minimum temperature, or there is coking at the top of the coke cake, the expert judgment system issues an adjustment command to reduce the opening of the air flow regulating device of the bottom air corresponding to the air shut-off switch and / or increase the opening of the air flow regulating device of the middle and upper air corresponding to the exhaust gas shut-off switch, so as to reduce the amount of air entering from the bottom of the self-supporting flue and / or increase the amount of air entering from the middle and upper parts of the self-supporting flue.

[0011] (2) When the temperature difference of the exhaust gas in two adjacent heat storage chambers is greater than the set maximum value, the expert judgment system issues an adjustment command to adjust the exhaust gas switch corresponding to the heat storage chamber with the higher exhaust gas temperature, reduce the opening of the exhaust gas flap of the corresponding exhaust gas switch, and reduce the amount of exhaust gas in the corresponding heat storage chamber.

[0012] (3) When the oxygen content in the exhaust gas of a certain small flue exceeds the set maximum value, the expert judgment system issues an adjustment command to reduce the opening degree of the air flow regulating device of the corresponding exhaust gas switch and / or the opening degree of the exhaust gas flap, thereby reducing the amount of air entering the corresponding rising vertical flue of the small flue; conversely, when the oxygen content in the exhaust gas of a certain small flue is lower than the set minimum value, the expert judgment system issues an adjustment command to increase the opening degree of the air flow regulating device of the corresponding exhaust gas switch and / or the opening degree of the exhaust gas flap, thereby increasing the amount of air entering the corresponding rising vertical flue of the small flue.

[0013] Furthermore, the real-time data measured by the automatic monitoring system is periodically calibrated, and the calibration results are input into the expert judgment system.

[0014] Furthermore, after each coke pushing operation, the expert judgment system analyzes and adjusts the exhaust gas switches corresponding to the two heat storage chambers below the coking chamber. The adjustment of all exhaust gas switches is completed in one coking cycle.

[0015] Furthermore, the automatic coke cake temperature measurement system has six temperature measuring points symmetrically arranged at the upper, middle, and lower positions on both sides of the coke guide grid to measure the temperature of the upper, middle, and lower parts of the coke cake; at least one temperature measuring point is arranged at the middle position of the rear part of the coke guide grid to measure the center temperature of the coke cake; the temperature measuring device adopts a non-contact infrared photoelectric thermometer.

[0016] Furthermore, the furnace top space temperature measurement system is equipped with thermocouples at the root of each carbonization chamber riser pipe, with the measuring end of the thermocouple extending into the furnace top space below the riser pipe for real-time online measurement of the furnace top space temperature of the carbonization chamber.

[0017] Furthermore, the small flue gas measurement system includes a gas temperature measuring device and a gas oxygen content measuring device; the gas temperature measuring device is installed on the connecting pipe of the two small flues of the gas switch, and the gas oxygen content measuring device is installed on the gas connecting cylinder, used to measure the gas temperature and gas oxygen content of two adjacent downflow heat storage chambers.

[0018] Furthermore, the automatic adjustment system for the exhaust gas switch includes an exhaust gas switch and a coke oven exchange transmission system; the air flow is automatically controlled by an air flow regulating device on the exhaust gas switch, including independently adjusting the amount of air entering each small flue; the exhaust gas flow is automatically controlled by an exhaust gas flap on the exhaust gas switch, including independently adjusting the amount of exhaust gas entering each regenerator.

[0019] Furthermore, when the real-time production data is transmitted to the expert judgment system, it is transmitted wirelessly and via wired means, with the coke cake temperature signal being transmitted wirelessly.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The expert system is used to couple the coke cake automatic temperature measurement system, the waste gas switch automatic adjustment system, the furnace top space temperature measurement system, and the small flue waste gas measurement system. The measured coke cake temperature, furnace top space temperature, waste gas temperature, waste gas oxygen content and other production parameters are comprehensively judged. Based on the judgment results, the waste gas switch is automatically adjusted, realizing timely and automatic adjustment of the external adjustment type coke oven high-temperature heating, and further promoting the automation and intelligence process of coke oven production.

[0022] (2) By automatically adjusting the air volume and exhaust gas volume at the exhaust gas switch, the coke cake matures more evenly in the upper direction, solving problems such as graphite accumulation in the furnace top space, local coking of the coke cake, and smoke and fire during coke pushing. At the same time, it can also reduce the generation of nitrogen oxides in the vertical flue.

[0023] (3) By adjusting the oxygen content in the exhaust gas in a timely manner and solving problems such as temperature segregation in the regenerator, it is beneficial to reduce the amount of heating gas used and achieve energy conservation and emission reduction in coke oven production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an automatic heating coupling control method for coke ovens as described in this invention. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0026] like Figure 1 As shown, the automatic heating coupling control method for coke ovens described in this invention is applicable to externally controlled coke ovens where the air supply to the vertical flue is adjusted by an exhaust gas switch. The air supply to the bottom and upper middle parts of the vertical flue can be adjusted by exhaust gas switches corresponding to adjacent regenerators.

[0027] The coke oven automatic heating coupling control method of this invention includes an automatic monitoring system consisting of an automatic coke cake temperature measurement system, a furnace top space temperature measurement system, and a small flue gas measurement system; an automatic adjustment system for the waste gas switch; and an expert judgment system. Real-time production data measured by the automatic monitoring system, including parameters such as coke cake temperature, furnace top space temperature, waste gas temperature, and oxygen content in the waste gas, are transmitted to the expert judgment system. The expert judgment system then issues adjustment commands to the waste gas switch based on the judgment results, optimizing the amount of air entering the vertical flue and the amount of waste gas entering the regenerator, ultimately achieving the goal of improving the uniformity of vertical heating in the coke oven.

[0028] The automatic coke cake temperature measurement system of this invention preferably has six temperature measuring points symmetrically arranged at three positions (upper, middle, and lower) on both sides of the coke guide grid. These points measure the surface temperature of the coke cake at its upper, middle, and lower sides, respectively. The upper and lower temperature measuring points are located 200–500 mm from the corresponding upper and lower surfaces of the coke cake. Continuous temperature measurement is performed during the coke pushing operation, and the average value is used as the coke cake surface temperature. Based on this, the longitudinal temperature distribution of the coke cake can also be obtained, replacing the measurement of the transverse temperature, which is of reference value for adjusting the longitudinal heating uniformity of the coke oven. At least one temperature measuring point is set at the middle of the rear of the coke guide grid to measure the center temperature of the coke cake. All temperature measurements are performed using a non-contact infrared photoelectric thermometer. To prevent the influence of coke powder and tar, the infrared photoelectric thermometer needs to be inspected regularly.

[0029] The furnace top space temperature measurement system of this invention preferably installs thermocouples at the root of the riser pipe in each carbonization chamber. The measuring end of the thermocouple is inserted into the top space of the carbonization chamber below the riser pipe, with the insertion depth sufficient not to affect normal production operations such as coal charging and coke pushing. The temperature of the furnace top space in the carbonization chamber is measured in real time through the thermocouples. The measured temperature curve can also serve as a basis for coke oven fire control and guide coke oven production.

[0030] The small flue gas measurement system of the present invention includes a flue gas temperature measuring device and a flue gas oxygen content measuring device. The flue gas temperature measuring device is installed on the connecting pipe of the two small flues of the flue gas switch, and the flue gas oxygen content measuring device is installed on the flue gas connecting cylinder between the flue gas switch and the branch flue. It is used to measure the temperature and oxygen content of the flue gas in two adjacent downflow heat storage chambers.

[0031] The automatic adjustment system for the exhaust gas switch described in this invention includes an exhaust gas switch and a coke oven exchange transmission system, etc. It automatically controls the flow rate of air and exhaust gas through the air flow adjustment device and flap valve on the exhaust gas switch, including but not limited to independently adjusting the amount of air entering each small flue, independently adjusting the amount of exhaust gas flowing out of each heat storage chamber, and the total amount of exhaust gas flowing through the exhaust gas switch.

[0032] The real-time data measured by the automatic monitoring system described in this invention needs to be calibrated periodically, and then the calibration results are input into the expert judgment system. Signal transmission can be wireless or wired. However, since the coke cake temperature measurement system is installed on the coke quenching car, operating in a high-temperature environment and subject to constant movement, wireless signal transmission is required.

[0033] The coke cake temperature, the temperature difference between the upper, middle, and lower temperature measuring points, the temperature of the furnace top space, the temperature deviation of the exhaust gas from two adjacent regenerators, and the allowable range of oxygen content in the exhaust gas all need to be pre-entered into the expert judgment system and adjusted according to the actual coke oven production situation. Only when the expert judgment system determines that the corresponding parameters exceed the limits will the exhaust gas switch be adjusted accordingly. The adjustment range is related to the deviation between the measured values ​​from the automatic monitoring system and the allowable range of the corresponding parameters; the larger the deviation, the larger the adjustment range.

[0034] After each coke pushing operation is completed, the automatic monitoring system collects data such as temperature and oxygen content. The expert judgment system analyzes and adjusts the air intake and exhaust gas volume of the exhaust gas switches corresponding to the two regenerators below the coking chamber where the coke pushing operation took place. Adjustments to all exhaust gas switches can be completed within one coking cycle. After adjustment, a period of time (e.g., one coking cycle) can be allowed until the coke oven production process stabilizes after parameter adjustments before starting the next adjustment cycle, until the real-time production data of each coking chamber is controlled within the limits set by the expert judgment system.

[0035] The expert judgment system described in this invention can also have other interfaces, such as a horizontal temperature input interface and a NOx measurement data interface in the exhaust gas, which can be coupled with the adjustment of the horizontal temperature of the coke oven to further replace manual operation, promote the automation and intelligence of coke oven production, and achieve the goal of energy conservation and emission reduction.

[0036] To make the objectives, technical solutions, and technical effects of this invention clearer, the technical solutions in the embodiments of this invention are now described clearly and completely. However, the embodiments described below are only some embodiments of this invention, not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0037]

Example

[0038] In this embodiment, the expert judgment system's judgment process is as follows:

[0039] (1) When the measured coke cake temperature is higher at the top and lower at the bottom and the temperature difference exceeds 50°C, or the temperature of the furnace top space is higher than 850°C, or there is graphite accumulation in the furnace top space, the expert judgment system issues an adjustment command to increase the opening of the air flow adjustment device of the bottom air corresponding to the exhaust gas switch and decrease the opening of the air flow adjustment device of the middle and upper air corresponding to the exhaust gas switch, so that the amount of air entering from the bottom of the self-supporting flue increases and the amount of air entering from the middle and upper parts of the self-supporting flue decreases.

[0040] When the measured coke cake temperature is high at the top and low at the bottom with a temperature difference exceeding 50°C, or the temperature of the furnace top space is below 750°C, or there is coking on the top of the coke cake, the expert judgment system issues an adjustment command to reduce the opening of the air flow regulating device of the bottom air corresponding to the exhaust gas switch, while increasing the opening of the air flow regulating device of the middle and upper air corresponding to the exhaust gas switch, so that the amount of air entering from the bottom of the self-supporting flue is reduced, and the amount of air entering from the middle and upper parts of the self-supporting flue is increased.

[0041] (2) When the temperature difference of the exhaust gas in two adjacent heat storage chambers exceeds 30°C, the expert judgment system issues an adjustment command to adjust the exhaust gas switch corresponding to the heat storage chamber with higher exhaust gas temperature, reduce the opening of the exhaust gas flap of the corresponding exhaust gas switch, and reduce the amount of exhaust gas in the corresponding heat storage chamber.

[0042] (3) During normal coke oven production, the excess air coefficient in the coke oven is generally 1.15 to 1.25. When the oxygen content in the exhaust gas increases and the excess air coefficient exceeds 1.3, the expert judgment system issues an adjustment command to reduce the opening of the air flow regulating device of the corresponding exhaust gas switch, or at the same time reduce the opening of the exhaust gas flap of the corresponding exhaust gas switch, thereby reducing the amount of air entering the corresponding rising vertical flue of the small flue; conversely, when the oxygen content in the exhaust gas of a certain small flue is lower than the set minimum value, the expert judgment system issues an adjustment command to increase the opening of the air flow regulating device of the corresponding exhaust gas switch, or at the same time increase the opening of the exhaust gas flap of the corresponding exhaust gas switch, thereby increasing the amount of air entering the corresponding rising vertical flue of the small flue.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for automatic heating coupling control of a coke oven, characterized in that, The coke oven is an externally controlled coke oven where the air supply to the vertical flue is regulated by an exhaust gas switch. Air entering from the bottom of the vertical flue and air entering from the upper part of the vertical flue are preheated in corresponding regenerators, and the air flow is regulated by an air flow regulating device installed on the corresponding exhaust gas switch. The exhaust gas switch is also equipped with an exhaust gas flap to regulate the exhaust gas flow through the corresponding regenerator. A main exhaust gas flap is installed in the branch flue or main flue of the coke oven. The coke oven automatic heating coupling control method is based on the coke oven automatic heating coupling control system, which includes an automatic monitoring system, an exhaust gas switch automatic adjustment system, and a dedicated system. The system includes an expert evaluation system; the automatic monitoring system comprises an automatic coke cake temperature measurement system, an oven top space temperature measurement system, and a small flue gas measurement system; the real-time production data measured by the automatic monitoring system, including the coke cake temperature automatically measured by the automatic coke cake temperature measurement system, the oven top space temperature automatically measured by the oven top space temperature measurement system, the exhaust gas temperature measured by the small flue gas measurement system, and the oxygen content in the exhaust gas, are all transmitted to the expert evaluation system; the expert evaluation system pre-sets the allowable range values ​​for each evaluation parameter, including the coke cake temperature, the temperature difference between the upper, middle, and lower points of the coke cake, the oven top space temperature, the exhaust gas temperature deviation between two adjacent regenerators, and the oxygen content in the exhaust gas; The expert judgment system makes a judgment based on real-time production data and corresponding evaluation parameters, and issues instructions to the automatic adjustment system of the exhaust gas switch based on the judgment results to adjust the exhaust gas switch. The expert judgment system's judgment method includes: When the measured temperature of the upper part of the coke cake is higher than that of the lower part, or the temperature of the furnace top space is higher than the set maximum temperature, or there is graphite accumulation in the furnace top space, the expert judgment system issues an adjustment command to increase the opening of the air flow regulating device of the bottom air corresponding to the exhaust gas switch and / or decrease the opening of the air flow regulating device of the middle and upper air corresponding to the exhaust gas switch, so as to increase the amount of air entering from the bottom of the self-supporting flue and / or decrease the amount of air entering from the middle and upper parts of the self-supporting flue. When the temperature at the bottom of the coke cake is higher than the temperature at the top, or the temperature at the top of the furnace is lower than the set minimum temperature, or there is coking at the top of the coke cake, the expert judgment system issues an adjustment command to reduce the opening of the air flow regulating device of the bottom air corresponding to the exhaust gas switch and / or increase the opening of the air flow regulating device of the middle and upper air corresponding to the exhaust gas switch, so as to reduce the amount of air entering from the bottom of the self-supporting flue and / or increase the amount of air entering from the middle and upper parts of the self-supporting flue.

2. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, The expert judgment system also includes the following judgment methods: When the temperature difference of the exhaust gas in two adjacent heat storage chambers exceeds the set maximum value, the expert judgment system issues an adjustment command to adjust the exhaust gas switch corresponding to the heat storage chamber with the higher exhaust gas temperature, reducing the opening of the exhaust gas flap of the corresponding exhaust gas switch, thereby reducing the amount of exhaust gas in the corresponding heat storage chamber. When the oxygen content in the exhaust gas of a certain small flue exceeds the set maximum value, the expert judgment system issues an adjustment command to reduce the opening degree of the air flow regulating device of the corresponding exhaust gas switch and / or the opening degree of the exhaust gas flap, thereby reducing the amount of air entering the corresponding rising flue of the small flue. Conversely, when the oxygen content in the exhaust gas of a certain small flue is lower than the set minimum value, the expert judgment system issues an adjustment command to increase the opening degree of the air flow regulating device of the corresponding exhaust gas switch and / or the opening degree of the exhaust gas flap, thereby increasing the amount of air entering the corresponding rising flue of the small flue.

3. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, The real-time data measured by the automatic monitoring system is periodically calibrated, and the calibration results are input into the expert judgment system.

4. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, After each coke pushing operation, the expert judgment system analyzes and adjusts the exhaust gas switches corresponding to the two heat storage chambers below the coking chamber. The adjustment of all exhaust gas switches is completed in one coking cycle.

5. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, The automatic coke cake temperature measurement system has six temperature measuring points symmetrically set at the upper, middle, and lower positions on both sides of the coke guide grid to measure the temperature of the upper, middle, and lower parts of the coke cake; at least one temperature measuring point is set at the middle position of the rear part of the coke guide grid to measure the center temperature of the coke cake; the temperature measuring device adopts a non-contact infrared photoelectric thermometer.

6. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, The furnace top space temperature measurement system is equipped with thermocouples at the root of each carbonization chamber riser pipe. The measuring end of the thermocouple extends into the furnace top space below the riser pipe to measure the temperature of the carbonization chamber furnace top space in real time.

7. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, The small flue gas measurement system includes a flue gas temperature measuring device and a flue gas oxygen content measuring device. The flue gas temperature measuring device is installed on the connecting pipe of the two small flues of the flue gas switch, and the flue gas oxygen content measuring device is installed on the flue gas connecting cylinder. It is used to measure the flue gas temperature and flue gas oxygen content of two adjacent downflow heat storage chambers.

8. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, The automatic adjustment system for the exhaust gas switch includes an exhaust gas switch and a coke oven exchange transmission system; the air flow is automatically controlled by an air flow regulating device on the exhaust gas switch, including independently adjusting the amount of air entering each small flue; the exhaust gas flow is automatically controlled by an exhaust gas flap on the exhaust gas switch, including independently adjusting the amount of exhaust gas entering each regenerator.

9. The automatic heating coupling control method for a coke oven according to claim 1, characterized in that, When the real-time production data is transmitted to the expert judgment system, it is transmitted wirelessly and via wired means, with the coke cake temperature signal being transmitted wirelessly.

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