Retorting boiler for coke production based on in-furnace environment control

Abstract

The present invention relates to the field of retorting boilers, and is used to solve the problem that during coke production, the control of the temperature and gas atmosphere inside the furnace will affect each other, resulting in unstable control of the furnace environment and affecting the quality of coke. Specifically, it is a retorting boiler for coke production based on furnace environment control, including a temperature detection unit, an air intake control unit, a fluctuation supervision unit, a conditional branch unit, and a comprehensive evaluation unit; the present invention sets a heat exchange loop outside the retorting boiler, selects and distributes the air intake channels according to the temperature inside the boiler to reduce the impact of the air intake action during boiler operation on the stability of the furnace environment, and at the same time conducts three-dimensional acquisition of the environment inside the retorting boiler to obtain the temperature situation and gas atmosphere situation inside the boiler. At the same time, joint control is carried out according to the temperature and gas atmosphere inside the boiler to avoid interference with each other during the adjustment and control of multiple parameters, resulting in fluctuations in the furnace environment, and ensuring the stability of the environment inside the boiler.

Description

Technical Field

[0001] The present invention relates to the field of retorting boilers, and more particularly to a retorting boiler for coke production based on in-furnace environment control. Background Art

[0002] Coke is an important furnace charge that provides heat and reducing agents for blast furnace smelting. Coke is an indispensable furnace charge in blast furnace ironmaking, and its influence rate on the progress of blast furnace ironmaking technology is more than 30%. It occupies an important position in the burden material technology of blast furnace ironmaking. According to smelting requirements, blast furnace coke must have appropriate chemical and physical properties, including hot state properties at high temperatures. The large-scale expansion of blast furnace volume and the intensification of smelting have put forward more stringent requirements for the quality of blast furnace coke. Through the dissection of blast furnaces, the role and behavior of coke in blast furnaces have been comprehensively and systematically analyzed, and the quality requirements for blast furnace coke have been put forward accordingly. Research has been carried out on reducing the content of coke particles and coke fines in coke. The role of coke in blast furnace ironmaking is as follows: First, it is the main heat source. The heat provided by the combustion of carbon in blast furnace ironmaking accounts for 71% of the total heat source in blast furnace ironmaking. Second, it is a reducing agent. The reduction effect of coke is to reduce iron ore in the form of C and CO. Third, it is the framework role of the furnace charge. Coke plays a framework role in the blast furnace, supporting the ironmaking raw materials and acting as a gas permeable window for gas.

[0003] Therefore, the production quality of coke directly affects the subsequent smelting effect, and more precise production process control is required for the coke production process to ensure the production quality of coke. In the coke production process, the main factors affecting coke are: heating rate, in-furnace gas atmosphere, material layer thickness, and coke discharge thickness. Among them, the material layer thickness and coke discharge thickness can be continuously optimized and controlled through production experiments, and the control effect is relatively stable. However, the heating rate and in-furnace gas atmosphere are easily disturbed by various factors during the production process, resulting in fluctuations, which are the main factors causing differences in coke quality. At the same time, when gas is introduced into the furnace, the entering gas will also affect the furnace temperature, thereby causing mutual interference between the heating rate and the in-furnace gas atmosphere, making it more difficult to control precisely.

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

[0005] In the process of the production of the retorting boiler, the internal environment of the retorting boiler is three-dimensionally collected to obtain the temperature condition and the gas atmosphere condition inside the boiler. At the same time, combined control is carried out according to the temperature and gas atmosphere conditions inside the boiler, so as to avoid the mutual interference during the adjustment and control of multiple parameters, which may cause fluctuations in the internal environment of the boiler, ensure the stability of the internal environment of the boiler, and solve the problem that during the production of coke, the temperature inside the furnace and the gas atmosphere inside the furnace will affect each other, resulting in unstable control of the internal environment of the furnace and affecting the quality of coke. Therefore, a retorting boiler for coke production based on the control of the internal environment of the furnace is proposed.

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

[0007] A retorting boiler for coke production based on the control of the internal environment of the furnace, including a boiler furnace body. An exhaust port is provided at the top of the boiler furnace body, and a heat absorption annular channel is fixedly installed on the side wall of the boiler furnace body;

[0008] The inside of the heat absorption annular channel is closely attached to the outer wall of the boiler furnace body. A reversing valve is installed on the outer wall of the boiler furnace body. Multiple groups of first intake pipes are connected to the outer wall of the reversing valve. An intake manifold is installed on the side wall of the reversing valve. The intake manifold is distributed inside the heat absorption annular channel. A second intake pipe is installed at the other end of the heat absorption annular channel, and the second intake pipe is communicated with the boiler furnace body;

[0009] The reversing valve is controlled by an internal furnace environment control system to adjust the operating state and valve opening of the reversing valve;

[0010] The internal furnace environment control system includes a temperature detection unit, an intake control unit, a fluctuation supervision unit, a condition branch unit, and a comprehensive evaluation unit.

[0011] As a preferred embodiment of the present invention, the reversing valve is provided with two groups of gas outlets. One group is directly connected to the boiler furnace body, and the other group is connected to the intake manifold. The two groups of gas outlets are switched and controlled by the reversing valve to control the opening and closing conditions of the two groups of gas outlets of the reversing valve and the valve opening distribution ratio.

[0012] As a preferred embodiment of the present invention, the temperature detection unit is used to monitor the temperature inside the boiler furnace body to obtain the temperature distribution inside the boiler furnace body;

[0013] The intake control unit is used to control the reversing valve to correct the gas outlet direction of the reversing valve;

[0014] The fluctuation supervision unit obtains the temperature distribution through the temperature detection unit and conducts regional temperature fluctuation supervision on the temperature distribution on the time axis;

[0015] The conditional branch unit collects the gas atmosphere inside the boiler furnace body, conducts standardized detection on the production atmosphere according to the collected gas atmosphere, and generates an intake ratio control signal based on the monitoring results;

[0016] The comprehensive evaluation unit conducts statistics on the intake process and the temperature fluctuation signal, conducts comprehensive evaluation based on all the statistical results, and generates a stable evaluation result of the production process.

[0017] As a preferred embodiment of the present invention, the temperature detection unit collects the temperature inside the boiler furnace body by setting high-temperature sensors at different positions inside the boiler furnace body, and records the collected data as the initial temperature;

[0018] Among them, multiple groups of high-temperature sensors are arranged at equal intervals along the vertical direction of the boiler furnace body, and multiple groups are also arranged at equal intervals along the circumferential direction at the bottom of the boiler furnace body.

[0019] As a preferred embodiment of the present invention, the temperature detection unit compares the initial temperatures along the circumferential direction pairwise. If the difference between one group of initial temperatures and other initial temperatures is greater than the set value, the initial temperature is deleted, otherwise it is retained;

[0020] The temperature detection unit calculates the arithmetic mean of the retained temperatures in the circumferential direction, obtains the average temperature, and uses the average temperature as the temperature data at the collection point at the bottom of the boiler;

[0021] The temperature detection unit selects the initial temperatures of the adjacent temperature collection points in the vertical direction at the collection point at the bottom of the boiler, calculates the difference between the two initial temperatures to obtain the interval temperature difference, and compares the interval temperature difference with the set temperature difference threshold, and retains or deletes the initial temperature according to the comparison result.

[0022] As a preferred embodiment of the present invention, the method for the fluctuation supervision unit to conduct regional temperature fluctuation supervision is as follows:

[0023] The fluctuation supervision unit takes each temperature monitoring point in the vertical direction as the center, divides the boiler furnace body into multiple regions, and records the temperature in each region with the initial temperature at the temperature monitoring point;

[0024] When the fluctuation supervision unit obtains the initial temperature each time, it records the time when the initial temperature is obtained, so as to sequentially record the initial temperature in the form of a time axis to obtain the temperature change sequence of each region. The fluctuation supervision unit divides the difference between adjacent initial temperatures in the temperature change sequence by the interval time to obtain the temperature change speed of each region, and records the initial temperature difference as the temperature change amplitude.

[0025] As a preferred embodiment of the present invention, the conditional branch unit records the collected gas atmosphere to obtain the component ratio corresponding to each gas, compares the component ratio of each gas with the set range, and records the component ratio as a qualified ratio or an unqualified ratio according to the comparison result;

[0026] The conditional branch unit records the unqualified ratio and adaptively adjusts the components with the unqualified ratio during air intake.

[0027] As a preferred embodiment of the present invention, the air intake control unit obtains the temperature change speed and the temperature change amplitude, compares the temperature change speed and the temperature change amplitude with the corresponding thresholds respectively, generates a temperature fluctuation signal or a temperature stable signal according to the comparison result. At the same time, the air intake control unit obtains the air intake opening ratio of the current reversing valve. If a temperature fluctuation signal is generated, the air intake opening ratio is adjusted to increase the flow ratio of the intake manifold.

[0028] As a preferred embodiment of the present invention, the comprehensive evaluation unit counts the number of times of generating the unqualified ratio and the number of times of generating the temperature fluctuation signal, records them as the total change times, and calculates the ratio of the total change times to the set number threshold to obtain the change ratio. If the change ratio is greater than the set threshold, a production instability signal is generated. If the change ratio is less than the set threshold, a production stability signal is generated to obtain the production process stability evaluation result.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. By arranging a heat exchange loop outside the retorting boiler, when controlling the gas atmosphere inside the boiler, the intake channel is selected and distributed according to the temperature inside the boiler. The intake pipe is wound in the heat exchange loop and then introduced into the boiler, so as to reduce the impact of the intake action during the operation of the boiler on the stability of the furnace environment, improve the stability of the furnace environment, and reduce the periodic oscillation of temperature.

[0031] 2. In the present invention, during the production of the retorting boiler, the environment inside the retorting boiler is collected three-dimensionally to obtain the temperature situation and the gas atmosphere situation inside the boiler. At the same time, joint control is carried out according to the temperature and gas atmosphere inside the boiler, so as to control the temperature situation and the gas atmosphere situation inside the boiler at the same time, ensure the stability of the environment inside the boiler, and avoid the interference between multiple parameter adjustment controls resulting in fluctuations in the environment inside the boiler.

[0032] 3. In the present invention, the gas grouping situation and temperature fluctuation situation during the production process of the retorting boiler are statistically analyzed, and the production process of the boiler is evaluated according to the statistical analysis results, so as to predict the production quality of coke to a certain extent in advance, and correct the production situation according to the evaluation situation of the production process in subsequent production, thereby realizing the optimization of the production process control. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0034] Figure 1 is the front view structural schematic diagram of the present invention;

[0035] Figure 2 is the structural schematic diagram of the second intake pipe of the present invention;

[0036] Figure 3 is the system block diagram of the present invention;

[0037] Figure 4 is the system flow chart of the present invention.

[0038] In the figure: 1, boiler furnace body; 2, heat absorption loop; 3, exhaust port; 4, intake manifold; 5, reversing valve; 6, first intake pipe; 7, second intake pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0040] Embodiment 1:

[0041] Please refer to Figure 1 - Figure 4 As shown, the retorting boiler for coke production based on in-furnace environment control includes a boiler furnace body 1. An exhaust port 3 is provided at the top of the boiler furnace body 1, and a heat absorption loop 2 is fixedly installed on the side wall of the boiler furnace body 1;

[0042] The inside of the heat absorption loop 2 is closely attached to the outer wall of the boiler furnace body 1. A reversing valve 5 is installed on the outer wall of the boiler furnace body 1. Multiple groups of first intake pipes 6 are connected to the outer wall of the reversing valve 5. An intake manifold 4 is installed on the side wall of the reversing valve 5. The intake manifold 4 is distributed inside the heat absorption loop 2. The intake manifold 4 is provided with a second intake pipe 7 at the other end of the heat absorption loop 2, and the second intake pipe 7 is communicated with the boiler furnace body 1;

[0043] The reversing valve 5 is provided with two sets of gas outlets. One set is directly connected to the boiler furnace body 1, and the other set is connected to the intake manifold 4. The two sets of gas outlets are switched and controlled by the reversing valve 5 to control the opening and closing conditions of the two sets of gas outlets of the reversing valve 5 and the valve opening distribution ratio. The reversing valve 5 is controlled by the in-furnace environment control system, thereby adjusting the operating state of the reversing valve 5 and the valve opening.

[0044] Embodiment 2:

[0045] Please refer to Figure 1 - Figure 4 As shown in the figure, the in-furnace environment control system includes a temperature detection unit, an intake control unit, a fluctuation monitoring unit, a condition branch unit, and a comprehensive evaluation unit;

[0046] The temperature detection unit collects the temperature inside the boiler furnace body 1 by setting high-temperature temperature sensors at different positions inside the boiler furnace body 1, and records the collected data as the initial temperature;

[0047] Among them, multiple groups of high-temperature temperature sensors are arranged at equal intervals along the vertical direction of the boiler furnace body 1, and multiple groups are also arranged at equal intervals along the circumferential direction at the bottom of the boiler furnace body 1;

[0048] The temperature detection unit compares the initial temperatures along the circumferential direction pairwise. If the difference between one set of initial temperatures and other initial temperatures is greater than the set value, the initial temperature is deleted, otherwise it is retained;

[0049] The temperature detection unit calculates the arithmetic mean of the retained circumferential temperatures to obtain the average temperature, and uses the average temperature as the temperature data at the bottom collection point of the boiler;

[0050] The temperature detection unit selects the initial temperatures of the adjacent temperature collection points in the vertical direction at the bottom collection point of the boiler, calculates the difference between the two initial temperatures to obtain the interval temperature difference, and compares the interval temperature difference with the set temperature difference threshold. If the interval temperature difference is greater than the set temperature difference threshold, the initial temperature is deleted. If the interval temperature difference is less than or equal to the set temperature difference threshold, the initial temperature is retained, thereby obtaining the temperature distribution inside the boiler furnace body 1;

[0051] The fluctuation monitoring unit obtains the temperature distribution through the temperature detection unit, and divides the boiler furnace body 1 into multiple regions with each temperature monitoring point in the vertical direction as the center. The temperature in each region is based on the initial temperature at the temperature monitoring point, thereby obtaining the temperature distribution in each region;

[0052] When the fluctuation monitoring unit obtains the initial temperature each time, it records the time of obtaining the initial temperature, so as to record the initial temperature sequentially in the form of a time axis, obtain the temperature change sequence of each area. The fluctuation monitoring unit divides the difference between adjacent initial temperatures in the temperature change sequence by the interval time to obtain the temperature change speed of each area, and records the difference between the initial temperatures as the temperature change amplitude;

[0053] The condition distribution unit collects the gas atmosphere in the boiler furnace body 1, records the collected gas atmosphere, obtains the component ratio corresponding to each gas, and compares the component ratio of each gas with the set range. If the gas component ratio is within the set component ratio range, the component ratio is recorded as the qualified ratio. If the gas component ratio is outside the set component ratio range, the component ratio is recorded as the unqualified ratio. The unqualified ratio includes two cases: too high components and too low components, corresponding to the gas component ratio being higher than the set component ratio range and the gas component ratio being lower than the set component ratio range respectively;

[0054] The condition distribution unit records the unqualified ratio and adaptively adjusts the components of the unqualified ratio during air intake, that is, reduces the corresponding component ratio in the intake air when the components are too high, and increases the corresponding component ratio in the intake air when the components are too low;

[0055] The intake air control unit obtains the temperature change speed and the temperature change amplitude, and compares the temperature change speed and the temperature change amplitude with the corresponding thresholds respectively. If the temperature change speed is greater than the set threshold, a temperature change too fast signal is generated. If the temperature change speed is less than or equal to the set threshold, a temperature change normal signal is generated. If the temperature change amplitude is greater than the set threshold, a temperature change too large signal is generated. If the temperature change amplitude is less than or equal to the set threshold, a temperature change normal signal is generated;

[0056] When two temperature change normal signals are generated, a temperature stability signal is generated. When any one of the temperature change too large signal or the temperature change too fast signal is generated, a temperature fluctuation signal is generated;

[0057] At the same time, the intake air control unit obtains the intake air opening ratio of the current reversing valve 5. If a temperature stability signal is generated, the intake air opening ratio of the current reversing valve 5 is maintained unchanged;

[0058] If a temperature fluctuation signal is generated, the temperature fluctuation signal is judged. If it is a temperature change too large signal, the intake air opening ratio is adjusted so that all intake air passes through the intake manifold 4, circulates in the heat exchange loop for one week, and then enters through the second intake pipe 7. If it is a temperature change too fast signal, the intake air opening ratio is adjusted to increase the flow ratio of the intake manifold 4;

[0059] The comprehensive evaluation unit counts the temperature distribution of the boiler furnace body 1 and the unqualified ratio during the air intake process, counts the number of times of generating the unqualified ratio and the number of times of generating the temperature fluctuation signal, records it as the total number of fluctuations, calculates the ratio of the total number of fluctuations to the set number threshold to obtain the fluctuation ratio. If the fluctuation ratio is greater than the set threshold, a production instability signal is generated. If the fluctuation ratio is less than the set threshold, a production stability signal is generated, and the stable evaluation result of the production process is obtained.

[0060] 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 present invention to the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A dry distillation boiler for coke production based on furnace environment control, characterized in that: It comprises a boiler furnace body (1), the top of the boiler furnace body (1) is provided with an exhaust port (3), and the side wall of the boiler furnace body (1) is fixedly provided with a heat absorption ring channel (2); The interior of the heat absorption loop (2) is in close contact with the outer wall of the boiler furnace body (1), the outer wall of the boiler furnace body (1) is installed with a reversing valve (5), the outer wall of the reversing valve (5) is connected to multiple groups of first air intake pipes (6), the side wall of the reversing valve (5) is installed with an air intake manifold (4), the air intake manifold (4) is distributed inside the heat absorption loop (2), and the air intake manifold (4) is installed with a second air intake pipe (7) at the other end of the heat absorption loop (2), wherein the second air intake pipe (7) is connected to the boiler furnace body (1); The reversing valve (5) is controlled by the furnace environment control system, thereby adjusting the operating state and valve opening of the reversing valve (5); The furnace environment control system includes a temperature detection unit, an air intake control unit, a fluctuation supervision unit, a condition management unit and a comprehensive evaluation unit; The reversing valve (5) is provided with two groups of gas outlets, one group is directly connected to the boiler furnace body (1), and the other group is connected to the intake manifold (4). The two groups of gas outlets are switched and controlled by the reversing valve (5) to control the opening and closing conditions of the two groups of gas outlets of the reversing valve (5) and the valve opening distribution ratio; The temperature detection unit is used to monitor the temperature inside the boiler furnace (1) and obtain the temperature distribution inside the boiler furnace (1); The air intake control unit is used to control the reversing valve (5) and correct the gas outlet direction of the reversing valve (5); The fluctuation monitoring unit obtains the temperature distribution through the temperature detection unit, and performs regional temperature fluctuation monitoring on the temperature distribution on the time axis; The condition management unit collects the gas atmosphere in the boiler furnace (1), performs standardized detection of the production atmosphere based on the collected gas atmosphere, and generates an air intake ratio control signal based on the monitoring result; The comprehensive evaluation unit performs statistics on the air intake process and the temperature fluctuation signal, performs a comprehensive evaluation based on all statistical results, and generates a production process stability evaluation result.

2. The dry distillation boiler for coke production based on furnace environment control according to claim 1, characterized in that: The temperature detection unit is configured to provide high-temperature sensors at different positions inside the boiler furnace body (1), collect the temperature inside the boiler furnace body (1) according to the high-temperature sensors, and record the collected data as the initial temperature; A plurality of high-temperature sensors are arranged at equal intervals in a vertical direction of the boiler furnace body (1), and a plurality of high-temperature sensors are arranged at equal intervals in a circumferential direction at the bottom of the boiler furnace body (1).

3. The dry distillation boiler for coke production based on furnace environment control according to claim 2, characterized in that: The temperature detection unit compares the initial temperatures along the circumferential direction in pairs. If the difference between a group of initial temperatures and other initial temperatures is greater than a set value, the initial temperatures are deleted, otherwise they are retained. The temperature detection unit performs arithmetic averaging on the retained circumferential temperatures to obtain an average temperature, and uses the average temperature as the temperature data at the collection point at the bottom of the boiler; The temperature detection unit selects the initial temperature of the temperature collection point adjacent to the collection point at the bottom of the boiler in the vertical direction, calculates the difference between the two initial temperatures to obtain the interval temperature difference, compares the interval temperature difference with the set temperature difference threshold, and retains or deletes the initial temperature according to the comparison result.

4. The dry distillation boiler for coke production based on furnace environment control according to claim 1, characterized in that: The method for the fluctuation supervision unit to perform regional temperature fluctuation supervision is: The fluctuation monitoring unit divides the boiler body (1) into a plurality of regions with each temperature monitoring point in the vertical direction as the center, and the temperature in each region is recorded based on the initial temperature at the temperature monitoring point; Each time the fluctuation monitoring unit obtains the initial temperature, the fluctuation monitoring unit records the time of obtaining the initial temperature, thereby recording the initial temperature sequentially in the form of a time axis to obtain a temperature change sequence for each area. The fluctuation monitoring unit divides the adjacent initial temperature differences in the temperature change sequence by the interval time to obtain the temperature change speed for each area, and records the initial temperature difference as the temperature change amplitude.

5. The dry distillation boiler for coke production based on furnace environment control according to claim 1, characterized in that: The condition management unit records the collected gas atmosphere, obtains the component ratio corresponding to each gas, and compares the component ratio of each gas with the set range, and records the component ratio as a qualified ratio or an unqualified ratio according to the comparison result; The condition management unit records the unqualified proportions and adaptively adjusts the components of the unqualified proportions during air intake.

6. The dry distillation boiler for coke production based on furnace environment control according to claim 1, characterized in that: The air intake control unit obtains the temperature change speed and the temperature change amplitude, compares the temperature change speed and the temperature change amplitude with corresponding threshold values, and generates a temperature fluctuation signal or a temperature stability signal according to the comparison result. At the same time, the air intake control unit obtains the current air intake opening ratio of the reversing valve (5). If a temperature fluctuation signal is generated, the air intake opening ratio is adjusted to increase the flow ratio of the intake manifold (4).

7. The dry distillation boiler for coke production based on furnace environment control according to claim 1, characterized in that: The comprehensive evaluation unit will count the number of times the unqualified ratio is generated and the number of times the temperature fluctuation signal is generated, and record them as the total number of changes, and calculate the ratio of the total number of changes to the set number threshold to obtain the change ratio. If the change ratio is greater than the set threshold, a production instability signal is generated. If the change ratio is less than the set threshold, a production stability signal is generated to obtain a production process stability evaluation result.

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