A method and system for optimizing dry quenching burn loss rate

Abstract

The application discloses a method and system for optimizing dry quenching coke burn loss rate. The method comprises: obtaining a plurality of sets of actual production data of a dry quenching furnace at a preset data acquisition period; wherein the actual production data comprises circulating air volume; determining coke cold coke screen composition and corresponding circulating gas flow rate ratio in the dry quenching furnace under a plurality of preset circulating air volumes, and determining coke porosity according to the cold coke screen composition; under a preset stable working condition of dry quenching coke, calculating the dry quenching coke burn loss rate corresponding to each preset circulating air volume according to the actual production data; inputting the circulating gas flow rate ratio under each preset circulating air volume, the coke porosity and the dry quenching coke burn loss rate into a burn loss rate optimization model and calculating an adjustment coefficient, and determining whether the dry quenching coke burn loss rate needs to be optimized according to the numerical value of the adjustment coefficient. The technical scheme of the embodiment of the application can quickly and accurately determine and optimize the dry quenching coke burn loss rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optimizing dry quenching coke burn loss rate, and particularly relates to a method and system for optimizing dry quenching coke burn loss rate. BACKGROUND

[0002] Dry quenching coke technology is a quenching process using circulating gas mainly of nitrogen to directly contact with red coke and to occur reverse heat exchange. Dry quenching coke burn (dissolution) loss rate (hereinafter referred to as dry quenching coke burn loss rate) refers to the ratio of the amount of coke lost due to reaction of red coke and circulating gas in the quenching process to the total amount of red coke entering the dry quenching furnace.

[0003] At present, various methods have been proposed at home and abroad to optimize and reduce the dry quenching coke burn loss rate, for example, by supplementing nitrogen in the dry quenching furnace system or using dry quenching coke production data, different algorithms are used to establish a burn loss rate model, so as to optimize and reduce the dry quenching coke burn loss rate. However, due to the tightness of the entire dry quenching system in actual production and the change and lagging adjustment of the corresponding working condition factors of various production data, the dry quenching coke burn loss rate is affected, so that it is difficult to quickly and accurately measure and optimize the dry quenching coke burn loss rate. SUMMARY

[0004] The present application provides a method and system for optimizing dry quenching coke burn loss rate to quickly and accurately measure and optimize the dry quenching coke burn loss rate.

[0005] According to an aspect of the present application, a method for optimizing dry quenching coke burn loss rate is provided, characterized in that it comprises:

[0006] a plurality of sets of actual production data of the dry quenching furnace are obtained at a preset data acquisition period; wherein the actual production data includes a preset circulating air volume;

[0007] the cold coke sieve composition of the coke and the corresponding circulating gas flow ratio in the dry quenching furnace under a plurality of preset circulating air volumes are measured, and the coke porosity is determined according to the cold coke sieve composition; wherein the circulating gas flow ratio represents the ratio of the central flow rate of the circulating gas to the peripheral air flow rate in the dry quenching furnace;

[0008] under a preset stable working condition of dry quenching coke, the dry quenching coke burn loss rate corresponding to each preset circulating air volume is calculated according to the actual production data;

[0009] the circulating gas flow ratio under each preset circulating air volume, the coke porosity and the dry quenching coke burn loss rate are input into a burn loss rate optimization model and an adjustment coefficient is calculated, and according to the numerical value of the adjustment coefficient, it is determined whether the dry quenching coke burn loss rate needs to be optimized.

[0010] Optionally, the cold coke sieve composition includes the mass percentage of each particle size coke.

[0011] The coke porosity is determined according to the cold coke screening group;

[0012] A porosity calculation coefficient of the mass percentage of each particle size group of coke is determined.

[0013] The coke porosity is calculated according to the mass percentage of each particle size group of coke and the corresponding porosity calculation coefficient; wherein the coke porosity is related to the coal blending structure.

[0014] Optionally, the actual production data includes industrial parameters of cold coke, red coke and dust collection, and circulating gas components at the inlet and outlet of the dry quenching furnace; the industrial parameters of the cold coke include the mass of the cold coke and the fixed carbon content of the cold coke; the industrial parameters of the red coke include the mass of the red coke and the fixed carbon content of the red coke; the industrial parameters of the dust collection include the mass of the primary dust removal, the fixed carbon content of the primary dust removal, the mass of the secondary dust removal and the fixed carbon content of the secondary dust removal.

[0015] The coke burn-off rate corresponding to each of the preset circulating air volumes is calculated according to the actual production data, which comprises:

[0016] The cold coke carbon content is calculated according to the mass of the cold coke at the outlet of the dry quenching furnace and the fixed carbon content of the cold coke.

[0017] The red coke carbon content is calculated according to the mass of the red coke and the fixed carbon content of the red coke.

[0018] The sum of the carbon content of the primary dust removal and the carbon content of the secondary dust removal is calculated according to the mass of the primary dust removal, the fixed carbon content of the primary dust removal, the mass of the secondary dust removal and the fixed carbon content of the secondary dust removal.

[0019] The coke burn-off carbon content is calculated according to the circulating gas components at the inlet and outlet of the dry quenching furnace and the circulating gas flow at the inlet and outlet of the dry quenching furnace under standard conditions.

[0020] The dry quenching coke burn-off rate is calculated according to the coke burn-off carbon content and the red coke carbon content.

[0021] Optionally, the method for calculating the circulating gas flow at the inlet and outlet of the dry quenching furnace under standard conditions comprises:

[0022] The circulating gas flow at the inlet of the dry quenching furnace under standard conditions is calculated according to the circulating air volume, the temperature after the fan and the pressure after the fan.

[0023] The circulating gas flow at the outlet of the dry quenching furnace under standard conditions is calculated according to the circulating gas flow at the outlet of the dry quenching furnace under standard conditions, the amount of supplementary air, the ambient temperature and the ambient pressure.

[0024] Optionally, the method for calculating the adjustment coefficient comprises:

[0025]

[0026] wherein, ψ represents the coke dry quenching burn-off rate, ε represents the coke porosity, v represents the circulating air volume, and δ represents the circulating gas flow ratio in the dry quenching furnace.

[0027] Optionally, the determining whether the coke dry quenching burn-off rate needs to be optimized according to the value of the adjustment coefficient comprises:

[0028] comparing the adjustment coefficient with a first adjustment threshold and a second adjustment threshold to generate a comparison result, wherein the first adjustment threshold is smaller than the second adjustment threshold;

[0029] if the comparison result is that the adjustment coefficient is smaller than or equal to the first adjustment threshold, the coke dry quenching burn-off rate does not need to be optimized;

[0030] if the comparison result is that the adjustment coefficient is greater than the first adjustment threshold and smaller than the second adjustment threshold, the coke dry quenching burn-off rate needs to be optimized;

[0031] if the comparison result is that the adjustment coefficient is greater than or equal to the second adjustment threshold, it indicates that the dry quenching furnace has a fault.

[0032] Optionally, the optimizing the coke dry quenching burn-off rate comprises:

[0033] adjusting the opening degree of a baffle at the inlet of a coke dry quenching air duct to adjust the circulating gas flow ratio;

[0034] or, generating a circulating air volume working condition parameter and adjusting the circulating air volume.

[0035] Optionally, the preset stable working condition comprises that the coke dry quenching material level is within a preset material level range, the circulating gas carbon monoxide concentration is within a preset gas concentration range, the coke discharge volume is within a preset coke discharge volume range, the coke discharge temperature is within a preset coke discharge temperature range, and / or the circulating air volume is within a preset circulating air volume range.

[0036] Optionally, the preset material level range comprises 12-14 meters, the preset gas concentration range comprises 4%-6%, the preset coke discharge volume range comprises 100-120 t / h, the preset coke discharge temperature range comprises 170-200℃, and the preset circulating air volume range comprises 120000-150000 m 3 / h.

[0037] According to another aspect of the present application, there is provided a system for optimizing the coke dry quenching burn-off rate, which performs the method for optimizing the coke dry quenching burn-off rate as described in any embodiment of the first aspect;

[0038] The system for optimizing the dry quenching coke burn-off rate comprises a circulating gas flow ratio adjustment and interlocking device to optimize the dry quenching coke burn-off rate.

[0039] The method for optimizing the dry quenching coke burn-off rate provided in the embodiments of the present application acquires a plurality of sets of actual production data of the dry quenching furnace in a preset data acquisition period, measures the cold coke sieve fraction of the coke and determines the coke porosity, and measures the circulating gas flow ratio under a plurality of preset circulating air volumes. Compared with the working condition change situation of the plurality of production data in the related art, the embodiments of the present application simplify the optimization judgment of the dry quenching coke burn-off rate by introducing the two parameters of the coke porosity and the circulating gas flow ratio. In the preset stable working condition of the dry quenching coke, the dry quenching coke burn-off rate under different preset circulating air volumes is calculated according to the actual production data. A plurality of sets of the circulating gas flow ratio, the coke porosity and the dry quenching coke burn-off rate corresponding to different preset circulating air volumes are input into a burn-off rate optimization model, an adjustment coefficient is calculated, and whether to optimize the dry quenching coke burn-off rate is determined according to the size relationship of the adjustment coefficient. The embodiments of the present application can directly and accurately determine whether the dry quenching coke burn-off rate needs to be optimized by establishing the burn-off rate optimization model and calculating the size of the adjustment coefficient, and the influence of the adjustment on the dry quenching coke burn-off rate can be directly reflected on the numerical size of the adjustment coefficient, so that the adjustment does not have hysteresis. In this way, it can be quickly and accurately determined whether the dry quenching coke burn-off rate needs to be optimized, so as to realize reasonable and effective control of the dry quenching coke burn-off rate.

[0040] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating any labor on the basis of these drawings.

[0042] Figure 1 is a flow diagram of a method for optimizing the dry quenching coke burn-off rate according to an embodiment of the present application;

[0043] Figure 2 is a specific flow diagram of step S120 in a method for optimizing the dry quenching coke burn-off rate according to an embodiment of the present application;

[0044] Figure 3 is a specific flow diagram of step S130 in a method for optimizing the dry quenching coke burn-off rate according to an embodiment of the present application;

[0045] Figure 4 This is a schematic diagram of the specific process of step S140 in a method for optimizing the burn-off rate of dry quenching coke according to an embodiment of the present invention. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0048] This invention provides a method for optimizing the burn-off rate of dry quenching coke. Figure 1 This is a flowchart illustrating a method for optimizing the burn-off rate of dry quenching coke according to an embodiment of the present invention. This embodiment is applicable to situations where the burn-off rate of dry quenching coke needs to be optimized. Figure 1 As shown, the method for optimizing the dry quenching coke burn-off rate specifically includes the following steps:

[0049] S110. Acquire multiple sets of actual production data of the dry quenching furnace according to a preset data acquisition cycle; wherein, the actual production data includes the preset circulating air volume.

[0050] The preset data acquisition period is the time frequency of collecting the actual production data of the dry quenching furnace, so as to determine and optimize the coke burning loss rate of the dry quenching furnace within a certain preset data acquisition period. The preset data acquisition period can be set by the user according to actual needs, for example, the preset data acquisition period can be 12 hours, or can also be 24 hours, which is not limited herein. The actual production data of the dry quenching furnace is the data representing the running state of the dry quenching furnace in multiple aspects. Exemplarily, the actual production data can include the circulating gas carbon monoxide concentration, the circulating air volume, the material level height in the dry quenching furnace, the coke discharge volume, the coke discharge temperature, the supplementary air volume, the dust collection volume, and the industrial analysis data of red coke, cold coke and dust collection, etc., which is not limited herein. Within one preset data acquisition period, a plurality of sets of actual production data are obtained, wherein the plurality of sets of actual production data are the production data corresponding to a plurality of different preset circulating air volumes.

[0051] S120, determining the cold coke screen composition of the coke and the corresponding circulating gas flow ratio in the dry quenching furnace under a plurality of preset circulating air volumes, and determining the coke porosity according to the cold coke screen composition; wherein the circulating gas flow ratio represents the ratio of the circulating gas center flow to the peripheral air flow in the dry quenching furnace.

[0052] The cold coke screen composition of the coke refers to a physical property representing the particle size distribution of the coke, which is an index for evaluating the size and uniformity of the coke. The cold coke screen composition is the percentage of the mass of different particle sizes in the total mass of the coke. The determination of the cold coke screen composition of the coke can be performed by screening the coke by a mechanical screen to determine the particle size of the coke and the mass of the corresponding particle size coke. According to the determined cold coke screen composition of the coke, the specific surface and the void volume of the coke accumulation body can be estimated, and under the condition of ignoring the small pores of the coke itself, the coke accumulation pore in the dry quenching furnace can be regarded as the coke porosity. The circulating gas flow ratio in the dry quenching furnace, i.e. the ratio of the circulating gas center flow to the peripheral air flow in the dry quenching furnace, can be adjusted and determined by adjusting the opening value of the baffle set at the inlet of the air duct of the dry quenching furnace under different preset circulating air volumes.

[0053] S130, under the preset stable working condition of the dry quenching coke, calculating the dry quenching coke burning loss rate corresponding to each preset circulating air volume according to the actual production data.

[0054] Specifically, the preset stable working condition can include most of the working conditions that can occur in the dry quenching coke oven in the case of normal operation state. Illustratively, the preset stable working condition includes that the dry quenching coke level is within a preset level range, the circulating gas carbon monoxide concentration is within a preset gas concentration range, the coke discharge amount is within a preset coke discharge amount range, the coke discharge temperature is within a preset coke discharge temperature range, and / or the circulating air volume is within a preset circulating air volume range. For example, the preset level range includes 12-14 meters, the preset gas concentration range includes 4%-6%, the preset coke discharge amount range includes 100-120 t / h, the preset coke discharge temperature range includes 170-200°C, and the preset circulating air volume range includes 120000-150000 m 3 / h. According to the actual production data of the dry quenching coke oven corresponding to different preset circulating air volumes obtained, the dry quenching coke burn-off rate under each preset circulating air volume is calculated.

[0055] In S140, the circulating gas flow ratio, the coke porosity, and the dry quenching coke burn-off rate under each preset circulating air volume are input into a burn-off rate optimization model, and an adjustment coefficient is calculated. According to the numerical value of the adjustment coefficient, it is determined whether the dry quenching coke burn-off rate needs to be optimized.

[0056] Specifically, according to the circulating gas flow ratio and the coke porosity under different preset circulating air volumes obtained, and the dry quenching coke burn-off rate under different preset circulating air volumes calculated, a burn-off rate optimization model is established to represent the relationship between the circulating gas flow ratio and the coke porosity and the dry quenching coke burn-off rate. For dry quenching coke in a preset stable working condition, the influence on the dry quenching coke burn-off rate can only be considered by the two parameters of the coke porosity and the circulating gas flow ratio. Since other working condition parameters are in a stable state, it is not necessary to consider and adjust other multiple working condition parameters in the production data, thereby simplifying the optimization and adjustment of the dry quenching coke burn-off rate. Since the circulating gas flow ratio can be adjusted by the baffle opening degree, compared with other working condition parameters in the production data, the determination and adjustment of the circulating gas flow ratio will not have hysteresis, and thus the dry quenching coke burn-off rate can be quickly and accurately optimized and determined. According to the established burn-off rate optimization model, an adjustment coefficient can be calculated. The adjustment coefficient, as a data representing whether the dry quenching coke burn-off rate meets the requirements, can directly and accurately determine whether the dry quenching coke burn-off rate needs to be optimized according to the size of the adjustment coefficient, thereby realizing reasonable and effective control of the dry quenching coke burn-off rate.

[0057] The method for optimizing the dry quenching coke burn-off rate provided by the embodiment of the present application obtains a plurality of sets of actual production data of the dry quenching furnace in a preset data acquisition period, measures the cold coke screen composition of the coke and determines the coke porosity, and measures the circulating gas flow ratio under a plurality of preset circulating air volumes. Compared with the working condition change situation of the plurality of production data in the related art, the embodiment of the present application simplifies the optimization judgment of the dry quenching coke burn-off rate by introducing the two parameters of the coke porosity and the circulating gas flow ratio. In a preset stable working condition of the dry quenching coke, the dry quenching coke burn-off rate under different preset circulating air volumes is calculated according to the actual production data. A plurality of sets of circulating gas flow ratios, coke porosities and dry quenching coke burn-off rates corresponding to different preset circulating air volumes are input into a burn-off rate optimization model, an adjustment coefficient is calculated, and whether the dry quenching coke burn-off rate is optimized is determined according to the size relationship of the adjustment coefficient. The embodiment of the present application can directly and accurately determine whether the dry quenching coke burn-off rate needs to be optimized by establishing the burn-off rate optimization model and calculating the size of the adjustment coefficient, and the influence of the adjustment on the dry quenching coke burn-off rate can be directly reflected on the numerical size of the adjustment coefficient, so that the adjustment does not have hysteresis. In this way, it can be quickly and accurately determined whether the dry quenching coke burn-off rate needs to be optimized, thereby realizing reasonable and effective control of the dry quenching coke burn-off rate.

[0058] Optionally, Figure 2 is a specific flowchart of step S120 in the method for optimizing the dry quenching coke burn-off rate provided by the embodiment of the present application. On the basis of the above embodiment, the cold coke screen composition includes the mass percentage of each particle size coke. As shown in Figure 2 determining the coke porosity according to the cold coke screen composition in step S120 specifically includes the following steps:

[0059] S121, determining the porosity calculation coefficient of the mass percentage of each particle size coke.

[0060] Specifically, the porosity calculation coefficient is determined for the corresponding particle size coke component according to the different particle size or block size coke components existing in the coke. For example, Table 1 shows the cold coke screen composition of a kind of coke, and Table 1 is as follows.

[0061] Table 1: Cold coke screen composition table of a kind of coke

[0062]

[0063] In the coke, the mass percentage of the coke with a particle size greater than 80 mm is a1, the mass percentage of the coke with a particle size between 60 and 80 mm is a2, the mass percentage of the coke with a particle size between 40 and 60 mm is a3, the mass percentage of the coke with a particle size between 25 and 40 mm is a4, the mass percentage of the coke with a particle size between 10 and 25 mm is a5, and the mass percentage of the coke with a particle size less than 10 mm is a6.

[0064] According to the particle size of each coke component, the porosity calculation coefficient of coke with particle size greater than 80 mm can be set to 15.5, the porosity calculation coefficient of coke with particle size between 60 and 80 mm can be set to 11.3, the porosity calculation coefficient of coke with particle size between 40 and 60 mm can be set to 9.1, the porosity calculation coefficient of coke with particle size between 25 and 40 mm can be set to 7.6, the porosity calculation coefficient of coke with particle size between 10 and 25 mm can be set to 6.7, and the porosity calculation coefficient of coke with particle size less than 10 mm can be set to 6.3.

[0065] S122, according to the mass percentage of each particle size coke and the corresponding porosity calculation coefficient, the coke porosity is calculated; wherein the coke porosity is related to the coal blending structure.

[0066] Exemplarily, according to the mass percentage of different particle size coals in the coke and the corresponding porosity calculation coefficient, the coke porosity can be calculated according to formula (1). Formula (1) can be expressed in the following form:

[0067] ε = 0.0005 x (15.5a1 + 11.3a2 + 9.1a3 + 7.6a4 + 6.7a5 + 6.3a6) (1)

[0068] Wherein, ε represents the coke porosity.

[0069] It should be noted that the coke porosity is only related to the coal blending structure of the coke, and under the same coal blending structure, the coke porosity can be considered not to change. In actual production process, when the coal blending structure of the coke changes, the coke porosity of the coke with new coal blending structure needs to be recalculated to ensure the accuracy of the burn loss rate optimization model related to the coke porosity, so as to facilitate the accurate determination and optimization of the dry quenching coke burn loss rate.

[0070] Optionally, Figure 3 is a specific flowchart of step S130 in a method for optimizing dry quenching coke burn loss rate provided by the embodiments of the present application. On the basis of the above embodiments, the actual production data includes the industrial parameters of cold coke, red coke and dust collection, and the circulating gas components at the inlet and outlet of the dry quenching furnace; the industrial parameters of cold coke include cold coke mass and cold coke fixed carbon content; the industrial parameters of red coke include red coke mass and red coke fixed carbon content; the industrial parameters of dust collection include primary dust mass, primary dust fixed carbon content, secondary dust mass and secondary dust fixed carbon content. The red coke carbon content in the dry quenching system cannot be directly measured, and the carbon content of the same furnace wet quenching coke can be used instead; the coke powder is collected through the ground collection station, the coke powder carbon content of multiple preset data collection periods is counted and the average value is calculated as the carbon content of the dry quenching furnace coke powder; the carbon content of the cold coke is also obtained by statistical method. For example, the carbon content of the cold coke can be obtained by statistical method as follows:Figure 3 As shown, the calculation of the dry quenching loss rate corresponding to each of the preset circulating air volume according to the actual production data in step S130 specifically includes the following steps:

[0071] S131, calculating the cold coke carbon content according to the cold coke quality and the cold coke fixed carbon content at the outlet of the dry quenching furnace.

[0072] Exemplarily, by obtaining the cold coke quality and the cold coke fixed carbon content at the outlet of the dry quenching furnace, the cold coke carbon content can be calculated according to formula (2). Formula (2) can be expressed in the following form:

[0073] G lj (c)=G lj ×FC d,lj (2)

[0074] Wherein, G lj represents the cold coke quality at the outlet of the dry quenching furnace, FC d,lj represents the cold coke fixed carbon content, and G lj (c) represents the cold coke carbon content.

[0075] S132, calculating the red coke carbon content according to the red coke quality and the red coke fixed carbon content.

[0076] Exemplarily, by obtaining the red coke quality and the red coke fixed carbon content, the red coke carbon content can be calculated according to formula (3). Wherein, formula (3) can be expressed in the following form:

[0077]

[0078] Wherein, FC d,hj represents the red coke fixed carbon content, G hj represents the red coke quality, and G hj (c) represents the red coke carbon content.

[0079] S133, calculating the sum of the carbon content of the primary dust removal and the carbon content of the secondary dust removal according to the primary dust removal quality, the fixed carbon content of the primary dust removal, the secondary dust removal quality and the fixed carbon content of the secondary dust removal.

[0080] Exemplarily, by obtaining the parameters of the primary dust removal quality, the fixed carbon content of the primary dust removal, the secondary dust removal quality and the fixed carbon content of the secondary dust removal, the sum of the carbon content of the primary dust removal and the carbon content of the secondary dust removal can be calculated according to formula (4). Wherein, formula (4) can be expressed in the following form:

[0081] G jc (c)=G 1DC ×FC d,1DC +G 2DC ×FC d,2DC (4)

[0082] wherein FC d,1DC represents the fixed carbon content of the primary dedusting, FC d,2DC represents the fixed carbon content of the secondary dedusting, G 1DC represents the mass of the primary dedusting, G 2DC represents the mass of the secondary dedusting, G jc (c) represents the sum of the primary dedusting carbon content and the secondary dedusting carbon content.

[0083] S134, calculating the coke burn-off carbon content according to the circulating gas composition at the inlet and outlet of the dry quenching furnace and the circulating gas flow rate at the inlet and outlet of the dry quenching furnace under standard conditions.

[0084] Exemplarily, the circulating gas composition at the inlet and outlet of the dry quenching furnace can include the percentage content of carbon monoxide and carbon dioxide at the inlet of the dry quenching furnace and the percentage content of carbon monoxide and carbon dioxide at the outlet of the dry quenching furnace. For the determination of the circulating gas composition at the inlet and outlet of the dry quenching furnace, sampling is performed at a total depth of one-half to three-quarters of the total height after removing the thickness of the external insulation layer, and the measurement data is the working condition at the outlet of the dry quenching furnace. The circulating gas flow rate at the inlet and outlet of the dry quenching furnace under standard conditions can be calculated. According to the circulating gas composition at the inlet and outlet of the dry quenching furnace and the circulating gas flow rate at the inlet and outlet of the dry quenching furnace under standard conditions, the coke burn-off carbon content can be calculated according to formula (5). Formula (5) can be expressed in the following form:

[0085]

[0086] wherein n(CO)1 and n(CO2)1 represent the percentage content of carbon monoxide and carbon dioxide at the inlet of the dry quenching furnace, respectively, and n(CO)2 and n(CO2)2 represent the percentage content of carbon monoxide and carbon dioxide at the outlet of the dry quenching furnace, respectively, represents the circulating gas flow rate at the inlet of the dry quenching furnace under standard conditions, represents the circulating gas flow rate at the outlet of the dry quenching furnace under standard conditions, G ss(c) represents the coke burn-off carbon content.

[0087] Optionally, the method for calculating the circulating gas flow rate at the inlet and outlet of the dry quenching furnace under standard conditions can include the following steps:

[0088] According to the circulating air volume, the temperature after the fan, and the pressure after the fan, the circulating gas flow rate at the inlet of the dry quenching furnace under standard conditions is calculated.

[0089] Exemplarily, according to the circulating air volume, the temperature after the fan, and the pressure after the fan, the circulating gas flow rate at the inlet of the dry quenching furnace under standard conditions can be calculated according to formula (6). Formula (6) can be expressed in the following form:

[0090]

[0091] wherein, V xh represents the circulating air flow, t fj represents the temperature behind the fan, P fj represents the pressure behind the fan.

[0092] According to the circulating gas flow at the outlet of the dry quenching furnace under standard conditions, the amount of supplemental air, the ambient temperature and the ambient pressure, the circulating gas flow at the outlet of the dry quenching furnace under standard conditions is calculated.

[0093] Exemplarily, according to the amount of supplemental air obtained, the ambient temperature and the ambient pressure, and the circulating gas flow at the outlet of the dry quenching furnace under standard conditions calculated, the circulating gas flow at the outlet of the dry quenching furnace under standard conditions can be calculated according to formula (7). Formula (7) can be expressed in the following form:

[0094]

[0095] wherein, V xh1 represents the circulating gas flow at the inlet of the dry quenching furnace; V bqq represents the amount of supplemental air; t hjw represents the ambient temperature; P hjw represents the ambient pressure, which can be taken as the standard atmospheric pressure, i.e. 101325 Pa.

[0096] S135, according to the coke burn-off carbon content and the red coke carbon content, the dry quenching coke burn-off rate is calculated.

[0097] Exemplarily, according to the red coke carbon content and the coke burn-off carbon content calculated, the dry quenching coke burn-off rate can be calculated by formula (8) using the carbon balance method. Wherein, formula (8) can be expressed in the following form:

[0098]

[0099] wherein, represents the dry quenching coke burn-off rate.

[0100] The method for optimizing the dry quenching coke burn-off rate provided in this embodiment can calculate the dry quenching furnace burn-off rate corresponding to the actual production data under different preset circulating air flows by using the carbon balance method, so as to subsequently establish a burn-off rate optimization model.

[0101] Optionally, on the basis of each of the above embodiments, the calculation method of the adjustment coefficient in step S140 comprises:

[0102]

[0103] wherein, ψ represents the dry quenching coke burn-off rate, ε represents the coke porosity, v represents the circulating air flow, δ represents the circulating gas flow ratio in the dry quenching furnace, and H represents the adjustment coefficient.

[0104] The adjustment coefficient can be calculated by substituting the obtained circulation air volume and circulation gas flow ratio, and the calculated dry quenching coke burn-off rate and coke porosity into the above formula.

[0105] Optionally, Figure 4 is a specific flowchart of step S140 in a method for optimizing dry quenching coke burn-off rate provided by the embodiments of the present application. Based on the above embodiments, whether the dry quenching coke burn-off rate needs to be optimized according to the numerical value of the adjustment coefficient in step S140, specifically includes the following steps:

[0106] S141, compare the adjustment coefficient with the first adjustment threshold and the second adjustment threshold to generate a comparison result; wherein the first adjustment threshold is less than the second adjustment threshold.

[0107] Exemplarily, the first adjustment threshold and the second adjustment threshold are two critical values for judging whether the dry quenching coke burn-off rate needs to be optimized, and the first adjustment threshold and the second adjustment threshold can be set by the user according to actual needs, which is not limited herein, so that the adjustment coefficient can be better judged according to the first adjustment threshold and the second adjustment threshold, and the dry quenching coke burn-off rate can be reasonably and effectively controlled.

[0108] S142, if the comparison result is that the adjustment coefficient is less than or equal to the first adjustment threshold, the dry quenching coke burn-off rate does not need to be optimized.

[0109] Exemplarily, when the adjustment coefficient is less than or equal to the first adjustment threshold, it indicates that the dry quenching coke burn-off rate is low and meets the production requirements, so the dry quenching coke burn-off rate does not need to be optimized.

[0110] S143, if the comparison result is that the adjustment coefficient is greater than the first adjustment threshold and less than the second adjustment threshold, the dry quenching coke burn-off rate needs to be optimized.

[0111] Exemplarily, when the adjustment coefficient is greater than the first adjustment threshold and less than the second adjustment threshold, it indicates that the dry quenching coke burn-off rate is large, and the dry quenching coke burn-off rate needs to be optimized, so as to reduce the dry quenching coke burn-off rate and make the dry quenching coke burn-off rate meet the production requirements.

[0112] S144, if the comparison result is that the adjustment coefficient is greater than or equal to the second adjustment threshold, it indicates that the dry quenching furnace has a fault.

[0113] Exemplarily, when the adjustment coefficient is greater than or equal to the second adjustment threshold value, it indicates that the coke dry quenching burn-off rate is too large. At this time, the value of the adjustment coefficient is not a possible situation in the normal operation process of the coke dry quenching furnace, and thus indicates that a fault occurs in the operation process of the coke dry quenching furnace. The fault can specifically include that the negative pressure section of the coke dry quenching furnace can leak. Therefore, when the adjustment coefficient is greater than or equal to the second adjustment threshold value, the negative pressure section of the coke dry quenching furnace needs to be checked for leakage.

[0114] Exemplarily, the first adjustment threshold value can be 1.1, and the second adjustment threshold value can be 1.5. That is, when the adjustment coefficient is less than or equal to 1.1, the coke dry quenching burn-off rate does not need to be optimized; when the adjustment coefficient is greater than 1.1 and less than 1.5, the coke dry quenching burn-off rate needs to be optimized; and when the adjustment coefficient is greater than or equal to 1.5, it indicates that the coke dry quenching furnace has a fault.

[0115] Optionally, on the basis of the above embodiment, the optimization of the coke dry quenching burn-off rate in step S143 can include the following method:

[0116] Adjusting the opening degree of the baffle at the inlet of the coke dry quenching air duct to adjust the circulating gas flow ratio; or generating a circulating air volume working condition parameter and adjusting the circulating air volume.

[0117] Exemplarily, when the adjustment coefficient is greater than the first adjustment threshold value and the adjustment coefficient is less than the second adjustment threshold value, the opening degree value of the baffle arranged at the inlet of the coke dry quenching air duct can be adjusted, so as to adjust the circulating gas flow ratio in the coke dry quenching furnace, so that the value of the adjustment coefficient is adjusted to the normal range. Alternatively, the circulating air volume entering the coke dry quenching furnace can also be adjusted according to the working condition parameter related to the circulating air volume, so as to reasonably and effectively optimize and control the coke dry quenching burn-off rate.

[0118] An implementable embodiment takes a 140t / h coke dry quenching furnace of a certain coking plant which is in stable operation as the research object, and a method for optimizing the coke dry quenching burn-off rate can specifically include the following steps:

[0119] S1, testing and collecting production data of the coke dry quenching furnace which is in stable operation; wherein the testing content includes gas components at different positions, changes of gas components at the inlet and outlet of the coke dry quenching furnace under different working conditions, and operating parameters of the coke dry quenching furnace and property parameters of the coke of the coking plant.

[0120] Exemplarily, Table 2 shows the working condition parameters of the 140t / h coke dry quenching furnace of a certain coking plant, and Table 2 is shown as follows:

[0121] Table 2 Working condition parameter table of the 140t / h coke dry quenching furnace of a certain coking plant

[0122]

[0123] S2, measure and analyze the parameters of cold coke and red coke in dry quenching coke, dust collection parameters, and the gas composition and content of the inlet and outlet of the dry quenching furnace, and calculate the dry quenching furnace burn loss rate by carbon balance method.

[0124] Exemplarily, Table 3 shows the gas composition and content of the inlet and outlet of the dry quenching furnace, and Table 3 is as follows:

[0125] Table 3 Gas composition and content table of dry quenching furnace inlet and outlet circulating gas

[0126]

[0127] S3, taking the prepared coke with the same coal blending structure as the object, measuring the cold coke sieve composition, ignoring the small pores of the coke itself, and taking the coke stacking porosity in the dry quenching furnace as the coke porosity; and measuring the different circulating gas center and peripheral airflow flow rate ratio under the corresponding circulating air volume.

[0128] S4, according to the actual working condition dry quenching data and the burn (dissolution) loss rate calculated by the carbon balance method, the relationship model and adjustment coefficient H between the dry quenching burn (dissolution) loss rate Ψ and the coke void ratio ε, the circulating gas center and peripheral airflow flow rate ratio δ and the circulating air volume v are judged by production data combined with multiple linear regression analysis optimization.

[0129] When H≤1.1, the circulating gas flow rate ratio and the circulating air volume do not need to be adjusted;

[0130] When 1.1<H<1.5, reduce the circulating air volume or the circulating gas flow rate ratio;

[0131] When H≥1.5, the dry quenching negative pressure section needs to be checked for leakage.

[0132] S5, according to the judgment, automatically adjust the dry quenching air duct inlet baffle opening, adjust the circulating gas center and peripheral airflow flow rate ratio, and optimize the circulating air volume working condition parameters and perform data feedback and adjustment.

[0133] Exemplarily, the burn (dissolution) loss rates before and after optimization under the same working condition in a period are shown in Table 4 as follows:

[0134] Table 4 Comparison of dry quenching burn loss rates before and after optimization

[0135]

[0136] Therefore, the method for optimizing the dry quenching burn loss rate can effectively reduce and control the dry quenching burn loss rate to a reasonable level.

[0137] The embodiment of the present application also provides a system for optimizing dry quenching coke burn loss rate. The system executes the method for optimizing dry quenching coke burn loss rate provided by any of the above embodiments, and has the same beneficial effects as the method for optimizing dry quenching coke burn loss rate. The system is provided with a circulating gas flow ratio adjusting and interlocking device to optimize the dry quenching coke burn loss rate. Specifically, in the process of executing the method, the system simplifies the optimization judgment of the dry quenching coke burn loss rate by introducing two parameters of coke porosity and circulating gas flow ratio. By establishing a burn loss rate optimization model and calculating the size of the adjustment coefficient, it can be directly and accurately determined whether the dry quenching coke burn loss rate needs to be optimized. When optimizing the dry quenching coke burn loss rate, the circulating gas flow ratio adjusting and interlocking device can automatically adjust the opening value of the baffle at the inlet of the dry quenching coke wind channel, so as to adjust the flow ratio of the circulating gas central airflow and the surrounding airflow, and the influence of the adjustment on the dry quenching coke burn loss rate can be directly reflected on the size of the adjustment coefficient, so there is no lag in the adjustment. Therefore, it can be quickly and accurately determined whether the dry quenching coke burn loss rate needs to be optimized, so as to realize reasonable and effective control of the dry quenching coke burn loss rate.

[0138] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for optimizing the coke burn-off rate in dry quenching, characterized in that, include: Multiple sets of actual production data of the dry quenching furnace are acquired at a preset data acquisition cycle; wherein, the actual production data includes a preset circulating air volume; The cold coke sieve composition and the corresponding circulating gas flow ratio in the dry quenching furnace under multiple preset circulating air volumes are determined, and the coke porosity is determined based on the cold coke sieve composition; wherein, the circulating gas flow ratio characterizes the ratio of the central flow rate of the circulating gas in the dry quenching furnace to the flow rate of the surrounding airflow. Under preset stable operating conditions, the dry quenching burn-off rate corresponding to each preset circulating air volume is calculated based on the actual production data. The circulating gas flow ratio, coke porosity, and dry quenching burn-off rate under each preset circulating air volume are input into the burn-off rate optimization model and the adjustment coefficient is calculated. Based on the magnitude of the adjustment coefficient, it is determined whether the dry quenching burn-off rate needs to be optimized. The method for calculating the adjustment coefficient includes: in, This indicates the dry quenching coke burn-off rate. This indicates the porosity of the coke. This indicates the preset circulating air volume. This indicates the circulating gas flow rate ratio within the dry quenching furnace; The step of determining whether to optimize the dry quenching burn-off rate based on the value of the adjustment coefficient includes: The adjustment coefficient is compared with the first adjustment threshold and the second adjustment threshold to generate a comparison result; wherein the first adjustment threshold is smaller than the second adjustment threshold. If the comparison result is that the adjustment coefficient is less than or equal to the first adjustment threshold, then there is no need to optimize the dry quenching burn-off rate. If the comparison result is that the adjustment coefficient is greater than the first adjustment threshold and the adjustment coefficient is less than the second adjustment threshold, then the dry quenching burn-off rate needs to be optimized. If the comparison result is that the adjustment coefficient is greater than or equal to the second adjustment threshold, it indicates that there is a fault in the dry quenching furnace; The optimization of the dry quenching coke burn-off rate includes: Adjust the opening of the baffle at the inlet of the dry quenching air duct to adjust the circulating gas flow ratio; Alternatively, generate circulating air volume operating parameters and adjust the preset circulating air volume.

2. The method for optimizing dry quenching coke burn-off rate according to claim 1, characterized in that, The cold coke screening composition includes the mass percentage of coke in each particle size fraction; The determination of coke porosity based on the cold coke sieving composition includes: Determine the porosity calculation coefficient for the mass percentage of coke of each particle size; The coke porosity is calculated based on the mass percentage of each coke particle size and the corresponding porosity calculation coefficient; wherein the coke porosity is related to the coal blending structure.

3. The method for optimizing dry quenching coke burn-off rate according to claim 1, characterized in that, The actual production data includes the industrial parameters of red coke and the composition of the circulating gas at the inlet and outlet of the dry quenching furnace; the industrial parameters of red coke include the red coke mass and the fixed carbon content of red coke. The step of calculating the dry quenching coke loss rate corresponding to each preset circulating air volume based on the actual production data includes: The carbon content of the red coke is calculated based on the mass of the red coke and the fixed carbon content of the red coke. Calculate the carbon content of coke burn-off based on the circulating gas composition at the inlet and outlet of the dry quenching furnace and the circulating gas flow rate at the inlet and outlet of the dry quenching furnace under standard conditions. The dry quenching coke burn-off rate is calculated based on the coke burn-off carbon content and the red coke carbon content.

4. The method for optimizing dry quenching coke loss rate according to claim 3, characterized in that, The method for calculating the circulating gas flow rate at the inlet and outlet of the dry quenching furnace under standard conditions includes: Calculate the circulating gas flow rate at the inlet of the dry quenching furnace under standard conditions based on the preset circulating air volume, the temperature after the blower, and the pressure after the blower. Calculate the circulating gas flow rate at the outlet of the dry quenching furnace under standard conditions, based on the circulating gas flow rate, supplementary air volume, ambient temperature, and ambient pressure.

5. The method for optimizing dry quenching coke burn-off rate according to claim 1, characterized in that, The preset stable operating conditions include the dry quenching coke material level being within a preset material level range, the circulating gas carbon monoxide concentration being within a preset gas concentration range, the coke discharge rate being within a preset coke discharge rate range, the coke discharge temperature being within a preset coke discharge temperature range, and / or the circulating air volume being within a preset circulating air volume range.

6. The method for optimizing dry quenching coke burn-off rate according to claim 5, characterized in that, The preset material level range includes 12-14 meters, the preset gas concentration range includes 4%-6%, the preset coke discharge rate range includes 100-120 t / h, the preset coke discharge temperature range includes 170-200℃, and the preset circulating air volume range includes 120,000-150,000 m³ / h. 3 / h.

7. A system for optimizing dry quenching coke burn-off rate, characterized in that, Perform the method for optimizing dry quenching burn-off rate as described in any one of claims 1-6; The system for optimizing dry quenching coke burn-off rate includes a circulating gas flow ratio adjustment and interlocking device to optimize the dry quenching coke burn-off rate.

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