Returned gas temperature control system suitable for coke production control

Abstract

The invention relates to the field of coke production control, and aims to solve the problem that coke production quality and production cost control are affected by unstable furnace temperature of a coking furnace due to the fact that the temperature in the coking furnace controlled by recycled gas in the coke production process is limited by the influence of the external environment. The invention particularly relates to a recycled gas temperature control system suitable for coke production control. According to the invention, when the recycled gas returns to the coking furnace, the temperature condition in the coking furnace, the return temperature of the recycled gas and the temperature loss of the recycled gas are collected, so that comprehensive analysis of the temperature in the furnace, the return temperature and the heat loss during pipeline return is realized, and further fine control of the return flow rate of the recycled gas is realized; the return temperature of the return coal gas is adjusted through flow rate control, the air inflow of the return coal gas can be controlled through the return flow rate, the quality of coke produced in the coking furnace is improved, and meanwhile the coke production cost is reduced through the return coal gas.

Description

Technical Field

[0001] The invention relates to the field of coke production control, in particular to a return gas temperature control system suitable for coke production control. Background Art

[0002] Coke is the key raw material for smelting steel. In addition to providing thermal energy, coke also plays a role in supporting the skeleton and acting as a reducing agent in the smelting process. From the perspective of current iron-making processes and technologies, the status of coke as a key raw material for blast furnace iron-making will not change for a long time in the future. The rapid development and application of large-scale blast furnaces and coal injection technology have made steel companies place higher requirements on the quality of coke. Metallurgical coke requires low ash content, low sulfur content, high hot and cold strength, and appropriately low reactivity. Therefore, on the premise of ensuring the quality of coke, it is a topic that every coking enterprise must study to expand the types of coking coal, save high-quality coking coal resources, reduce coke production costs, and improve coke quality.

[0003] At present, in coke production, controlling the temperature in the coking furnace by return gas can reduce the coke production cost to a certain extent. However, using the amount of return gas to control the standard temperature of coking is difficult to control due to extreme weather, upstream and downstream branches and emissions. Therefore, it is particularly important to strengthen the temperature control management of coke ovens and ensure that the heating temperature of the return gas is controlled within the test range during the coke production process.

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] In the present invention, when the return gas returns to the coking furnace, the temperature conditions in the coking furnace and the return temperature of the return gas are collected to achieve a comprehensive analysis of the furnace temperature and the return temperature, thereby improving the accuracy of the return gas in controlling the temperature in the coking furnace when it returns, improving the quality of coke produced in the coking furnace, and at the same time reducing the cost of coke production through the return gas, solving the problem that the use of return gas to control the temperature in the coking furnace during coke production is limited by the external environment, resulting in unstable furnace temperature of the coking furnace, affecting the quality of coke production and production cost control, and proposing a return gas temperature control system suitable for coke production control.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A return gas temperature control system suitable for coke production control, comprising a temperature monitoring unit, wherein the temperature monitoring unit is used to monitor the temperature of the return gas, analyze the monitored return gas temperature, and confirm the return gas temperature loss;

[0008] A temperature control unit, wherein the temperature control unit obtains the return gas temperature and temperature loss through the temperature monitoring unit, and controls the return gas operation according to the return gas temperature and temperature loss;

[0009] A furnace temperature control unit, which monitors the temperature in a coking furnace used for coke production, compares the detected furnace temperature with a preset temperature control range, and generates a furnace temperature control signal;

[0010] A re-furnace control unit, wherein the re-furnace control unit obtains a furnace temperature control signal and a furnace temperature through a furnace temperature control unit, and obtains a re-furnace gas temperature through a temperature control unit;

[0011] The recycling control unit performs comprehensive calculation and analysis based on the furnace temperature control signal, the temperature inside the furnace and the recycling gas temperature, performs recycling temperature control, and reintroduces the recycling gas into the coking furnace through recycling control.

[0012] As a preferred embodiment of the present invention, the temperature monitoring unit collects the starting point temperature and the ending point temperature at the starting point and the ending point of the recycled coal gas transmission pipeline respectively;

[0013] The temperature monitoring unit compares the starting temperature and the end temperature of the return gas to obtain the temperature loss. If the temperature loss is greater than a preset loss threshold, a loss excess signal is generated and sent to the central control screen for reminder.

[0014] As a preferred embodiment of the present invention, the method for the temperature monitoring unit to obtain the temperature loss is:

[0015] S1: The temperature monitoring unit collects multiple sets of data within a certain period of time, and calculates the difference between the starting temperature and the end temperature at the same time to obtain the temperature difference data at the corresponding time;

[0016] S2: Count all the temperature difference data, and compare the temperature difference data at different times to obtain the difference data between the temperature difference data at different times;

[0017] S3: Compare the difference data with a preset difference threshold, and if the difference data is not greater than the preset difference threshold, generate a data normal signal;

[0018] S4: Calculate the mean of all difference data of the normal signal of the generated data by arithmetic averaging to obtain the temperature loss.

[0019] As a preferred embodiment of the present invention, the temperature monitoring unit eliminates unreasonable data in the terminal temperature and then averages the terminal temperature to obtain the return gas temperature.

[0020] As a preferred embodiment of the present invention, the furnace temperature control unit can obtain the temperature in the furnace and the temperature control range preset in the production process, wherein the temperature control range includes T1-T2, T2-T3, T3-T4, wherein T1-T4 is the temperature control range in the production process, T1-T2 is the low temperature warning range, T3-T4 is the high temperature warning range, T1<T2<T3<T4;

[0021] If the temperature inside the furnace is within the low temperature warning range, a low temperature warning is generated; if the temperature inside the furnace is within the high temperature warning range, a high temperature warning is generated;

[0022] If the temperature inside the furnace is lower than T1 in the temperature control range, a low temperature alarm is generated; if the temperature inside the furnace is higher than T4 in the temperature control range, a high temperature alarm is generated;

[0023] The furnace temperature control unit generates a temperature increase fine-tuning signal after generating a low temperature warning, and generates a temperature decrease fine-tuning signal after generating a high temperature warning.

[0024] As a preferred embodiment of the present invention, the furnace control unit obtains the furnace gas temperature through the temperature monitoring unit, obtains the furnace temperature control signal and the furnace temperature through the furnace temperature control unit, and the furnace control unit generates the required furnace gas temperature r according to the furnace temperature. , where R is the heat provided by the fuel in the furnace, v is the gas inlet velocity of the return furnace, Tx is the current temperature in the furnace, and t is the preset coefficient;

[0025] The furnace control unit obtains the loop gas temperature control range through the loop gas temperature r and the preset fluctuation range. , y is the fluctuation amplitude, and the value range of y is 0.05.

[0026] As a preferred embodiment of the present invention, after obtaining the return gas temperature, the temperature control unit compares the return gas temperature with the return temperature control range, and generates a return gas temperature normal signal if the return gas temperature is within the return temperature control range, and generates a return gas temperature abnormal signal if the return gas temperature is outside the return temperature control range;

[0027] After the temperature control unit generates an abnormal return gas temperature signal, if the return gas temperature is less than the minimum value in the return temperature control range, it generates an insufficient return gas temperature signal; if the return gas temperature is greater than the maximum value in the return temperature control range, it generates an excessive return gas temperature signal.

[0028] As a preferred embodiment of the present invention, after the temperature control unit generates the insufficient return gas temperature signal, the temperature control unit increases the intake speed of the return gas until a normal return gas temperature signal is generated;

[0029] After generating a return coal gas temperature excessively high signal, the temperature control unit reduces the intake speed of the return coal gas until generating a return coal gas temperature normal signal.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the present invention, when the recycled coal gas returns to the coking furnace, the temperature conditions in the coking furnace and the return temperature of the recycled coal gas are collected to achieve a comprehensive analysis of the furnace temperature and the return temperature, thereby improving the accuracy of the recycled coal gas in controlling the temperature in the coking furnace when it returns, improving the quality of the coke produced in the coking furnace, and reducing the cost of coke production through the recycled coal gas.

[0032] 2. In the present invention, when collecting the return gas, the temperature loss of the return gas is analyzed, and the heat loss of the return gas when returning through the pipeline is obtained according to the temperature loss, thereby realizing fine control of the return flow rate of the return gas. The return temperature of the return gas can be adjusted by flow rate control, and the intake amount of the return gas can be controlled by the return flow rate, thereby improving the accuracy of controlling the temperature in the coking furnace by the return gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0034] Figure 1 is a system block diagram of the present invention;

[0035] Figure 2 It is a system flow chart of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] See also Figure 1 - Figure 2As shown, a return gas temperature control system suitable for coke production control includes a temperature monitoring unit, a temperature control unit, a return furnace control unit and a furnace temperature control unit. The temperature monitoring unit is used to monitor the temperature of the return gas. During monitoring, multiple groups of collection points are set at the starting point and the end point of the return gas transmission pipeline, so as to respectively collect the starting point temperature and the end point temperature of the return gas when it is transported in the pipeline;

[0039] The temperature monitoring unit compares the starting temperature and the end temperature of the recycled coal gas to obtain the temperature loss between the starting temperature and the end temperature of the recycled coal gas. The temperature monitoring unit compares the temperature loss with the preset loss threshold. If the temperature loss is greater than the preset loss threshold, a loss exceeding standard signal is generated. If the temperature loss is not greater than the preset loss threshold, a loss qualified signal is generated. After obtaining the loss exceeding standard signal, the temperature monitoring unit sends the loss exceeding standard signal to the central control screen via a wired or wireless network, and the central control screen reminds the loss exceeding standard signal.

[0040] The method for the temperature monitoring unit to obtain the temperature loss is:

[0041] S1: When the temperature monitoring unit collects the starting temperature and the end temperature, it collects multiple sets of data within a certain period of time, and calculates the difference between the starting temperature and the end temperature at the same time to obtain the temperature difference data at the corresponding time;

[0042] S2: Count all the temperature difference data, and compare the temperature difference data at different times to obtain the difference data between the temperature difference data at different times;

[0043] S3: Compare the difference data with a preset difference threshold, and if the difference data is greater than the preset difference threshold, generate a data abnormality signal; if the difference data is not greater than the preset difference threshold, generate a data normal signal;

[0044] S4: Select all difference data that generate normal data signals, and calculate the mean of the selected difference data by arithmetic averaging to obtain the temperature loss.

[0045] The temperature monitoring unit counts the terminal temperature of the return gas, eliminates the unreasonable data in the terminal temperature, and averages the terminal temperature to obtain the return gas temperature;

[0046] The method by which the temperature monitoring unit eliminates unreasonable data in the endpoint temperature is:

[0047] A set of endpoint temperatures is compared with two sets of endpoint temperatures before and after the adjacent collection time to obtain two sets of temperature fluctuation values. The temperature fluctuation values ​​are compared with the preset fluctuation threshold. If both sets of temperature fluctuation values ​​are greater than the preset fluctuation threshold, the endpoint temperature is recorded as unreasonable data. If both sets of temperature fluctuation values ​​are not all greater than the preset fluctuation threshold, the endpoint temperature is recorded as normal temperature.

[0048] Embodiment 2:

[0049] See also Figure 1 - Figure 2 As shown, the furnace temperature control unit monitors the temperature in the coking furnace, obtains the temperature in the furnace and the temperature control range preset in the production process, wherein the temperature control range includes T1-T2, T2-T3, T3-T4, wherein T1-T4 is the temperature control range in the production process, T1-T2 is the low temperature warning range, T3-T4 is the high temperature warning range, T1<T2<T3<T4;

[0050] The furnace temperature control unit compares the temperature inside the furnace with the preset temperature control range. If the temperature inside the furnace is between the preset temperature control range T2 and T3, no response is made. If the temperature inside the furnace is within the low temperature warning range, a low temperature warning is generated. If the temperature inside the furnace is within the high temperature warning range, a high temperature warning is generated.

[0051] If the temperature inside the furnace is lower than T1 in the temperature control range, a low temperature alarm is generated, and if the temperature inside the furnace is higher than T4 in the temperature control range, a high temperature alarm is generated.

[0052] The furnace temperature control unit generates a temperature increase fine-tuning signal after generating a low temperature warning, and generates a temperature decrease fine-tuning signal after generating a high temperature warning. The furnace temperature control unit generates a rapid temperature increase signal after generating a low temperature alarm, and generates a rapid temperature decrease signal after generating a high temperature alarm.

[0053] The furnace temperature control unit sends a temperature increase fine-tuning signal or a temperature decrease fine-tuning signal to the reheat control unit;

[0054] After generating a rapid temperature rise signal and a rapid temperature drop signal, the furnace temperature control unit controls the temperature in the coking furnace by controlling the air intake and the fuel in the coking furnace;

[0055] Among them, the rapid temperature reduction signal, the rapid temperature increase signal, the temperature increase fine-tuning signal and the temperature reduction fine-tuning signal are furnace temperature control signals.

[0056] Embodiment three:

[0057] See also Figure 1 - Figure 2As shown, the furnace control unit obtains the furnace gas temperature through the temperature monitoring unit, obtains the furnace temperature control signal and the furnace temperature through the furnace temperature control unit, and the furnace control unit generates the required furnace gas temperature r according to the furnace temperature. , where R is the heat provided by the furnace fuel, v is the loop gas intake speed, Tx is the current furnace temperature, and t is the preset coefficient;

[0058] The furnace control unit obtains the loop gas temperature control range through the loop gas temperature r and the preset fluctuation range. , y is the fluctuation amplitude, and the value range of y is 0.05.

[0059] Embodiment 4:

[0060] See also Figure 1 - Figure 2 As shown, after obtaining the return gas temperature, the temperature control unit compares the return gas temperature with the return temperature control range. If the return gas temperature is within the return temperature control range, a return gas temperature qualified signal is generated; if the return gas temperature is outside the return temperature control range, an abnormal return gas temperature signal is generated;

[0061] After generating a qualified return gas temperature signal, the temperature control unit generates a normal return gas temperature signal and continues to maintain the current gas return operation. After generating an abnormal return gas temperature signal, if the return gas temperature is less than the minimum value in the return temperature control range, the temperature control unit generates an insufficient return gas temperature signal; if the return gas temperature is greater than the maximum value in the return temperature control range, the temperature control unit generates an excessively high return gas temperature signal.

[0062] After generating a return gas temperature insufficient signal, the temperature control unit increases the intake speed of the return gas until generating a return gas temperature normal signal;

[0063] After generating a return coal gas temperature excessively high signal, the temperature control unit reduces the intake speed of the return coal gas until generating a return coal gas temperature normal signal.

[0064] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A return gas temperature control system suitable for coke production control, characterized in that: It includes a temperature monitoring unit, which is used to monitor the temperature of the return gas, analyze the monitored return gas temperature, and confirm the temperature loss of the return gas; A temperature control unit, wherein the temperature control unit obtains the return gas temperature and temperature loss through the temperature monitoring unit, and controls the return gas operation according to the return gas temperature and temperature loss; A furnace temperature control unit, which monitors the temperature in a coking furnace used for coke production, compares the detected furnace temperature with a preset temperature control range, and generates a furnace temperature control signal; A re-furnace control unit, wherein the re-furnace control unit obtains a furnace temperature control signal and a furnace temperature through a furnace temperature control unit, and obtains a re-furnace gas temperature through a temperature control unit; The furnace return control unit performs comprehensive calculation and analysis based on the furnace temperature control signal, the furnace temperature and the furnace return gas temperature, performs furnace return temperature control, and re-introduces the furnace return gas into the coking furnace through furnace return control; The furnace control unit obtains the furnace gas temperature through the temperature monitoring unit, obtains the furnace temperature control signal and the furnace temperature through the furnace temperature control unit, and the furnace control unit generates the required furnace gas temperature r according to the furnace temperature. , where R is the heat provided by the furnace fuel, v is the loop gas intake speed, Tx is the current furnace temperature, and t is the preset coefficient; The recycle control unit obtains the loop gas temperature control range (1±y)*r through the loop gas temperature r and the preset fluctuation range, where y is the fluctuation range and the value range of y is 0.

05.

2. A return gas temperature control system suitable for coke production control according to claim 1, characterized in that: The temperature monitoring unit collects the starting point temperature and the ending point temperature at the starting point and the ending point of the recycled gas transmission pipeline respectively; The temperature monitoring unit compares the starting temperature and the end temperature of the return gas to obtain the temperature loss. If the temperature loss is greater than a preset loss threshold, a loss excess signal is generated and sent to the central control screen for reminder.

3. A return gas temperature control system suitable for coke production control according to claim 2, characterized in that: The method for the temperature monitoring unit to obtain the temperature loss is: S1: The temperature monitoring unit collects multiple sets of data within a certain period of time, and calculates the difference between the starting temperature and the end temperature at the same time to obtain the temperature difference data at the corresponding time; S2: Count all the temperature difference data, and compare the temperature difference data at different times to obtain the difference data between the temperature difference data at different times; S3: Compare the difference data with a preset difference threshold, and if the difference data is not greater than the preset difference threshold, generate a data normal signal; S4: Calculate the mean of all difference data of the normal signal of the generated data by arithmetic averaging to obtain the temperature loss.

4. A return gas temperature control system suitable for coke production control according to claim 3, characterized in that: The temperature monitoring unit eliminates unreasonable data in the end point temperature and then averages the end point temperature to obtain the return gas temperature.

5. A return gas temperature control system suitable for coke production control according to claim 1, characterized in that: The furnace temperature control unit can obtain the temperature in the furnace and the temperature control range preset in the production process, wherein the temperature control range includes T1-T2, T2-T3, T3-T4, wherein T1-T4 is the temperature control range in the production process, T1-T2 is the low temperature warning range, T3-T4 is the high temperature warning range, T1<T2<T3<T4; If the temperature inside the furnace is within the low temperature warning range, a low temperature warning is generated; if the temperature inside the furnace is within the high temperature warning range, a high temperature warning is generated; If the temperature inside the furnace is lower than T1 in the temperature control range, a low temperature alarm is generated; if the temperature inside the furnace is higher than T4 in the temperature control range, a high temperature alarm is generated; The furnace temperature control unit generates a temperature increase fine-tuning signal after generating a low temperature warning, and generates a temperature decrease fine-tuning signal after generating a high temperature warning.

6. A return gas temperature control system suitable for coke production control according to claim 1, characterized in that: After obtaining the return gas temperature, the temperature control unit compares the return gas temperature with the return temperature control range. If the return gas temperature is within the return temperature control range, a return gas temperature normal signal is generated; if the return gas temperature is outside the return temperature control range, an return gas temperature abnormal signal is generated; After the temperature control unit generates an abnormal return gas temperature signal, if the return gas temperature is less than the minimum value in the return temperature control range, it generates an insufficient return gas temperature signal; if the return gas temperature is greater than the maximum value in the return temperature control range, it generates an excessive return gas temperature signal.

7. A return gas temperature control system suitable for coke production control according to claim 6, characterized in that: After the temperature control unit generates a signal indicating that the temperature of the recycled coal gas is insufficient, the temperature control unit increases the intake speed of the recycled coal gas until a signal indicating that the temperature of the recycled coal gas is normal is generated; After generating a return coal gas temperature excessively high signal, the temperature control unit reduces the intake speed of the return coal gas until generating a return coal gas temperature normal signal.

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