A low-nitrogen combustion kiln air inlet system and control method

Abstract

The application discloses a low-nitrogen combustion kiln air inlet system and a control method, and relates to the technical field of combustion kilns. The application solves the problem that the air inlet rate determined by the original mode is not the optimal air inlet rate, and can only guarantee normal combustion treatment of the corresponding kiln. The application analyzes past working parameters, confirms the corresponding working waveform curve, analyzes and cuts the waveform curve according to the input range value, confirms a plurality of to-be-analyzed line segments in the cutting process, selects a line segment with the maximum parameter from the plurality of to-be-analyzed line segments, and determines the corresponding rate interval. Subsequently, air is inlet according to the air inlet rate interval and heated. The air inlet mode can improve the overall combustion rate of the kiln, improve the combustion performance, shorten the combustion time, and improve the use effect of the kiln.

Description

Technical Field

[0001] This invention relates to the field of combustion kiln technology, specifically to an air intake system and control method for a horseshoe flame low-NOx combustion kiln. Background Technology

[0002] The combustion furnace consists of a melting pool, a small furnace, a regenerator, and a flue. It uses natural gas as fuel, and the flame flows in a horseshoe-shaped pattern inside the furnace, hence the name horseshoe-flame gas-fired melting furnace. The melting pool includes a large arch, breast wall, end walls, front wall, charging port, discharging port, pool wall, pool bottom, and flow channel; the small furnace includes a small furnace bottom plate, small furnace wall, small furnace arch, tongue arch, and burner nozzle; the regenerator includes checker bricks, grate arch, partition walls, and a flue.

[0003] During normal combustion in a low-NOx combustion kiln, the air intake rate needs to be determined based on the corresponding combustion temperature and combustion parameters. However, the air intake rate determined in this way is not the optimal air intake rate. It can only ensure that the kiln can carry out normal combustion, but it cannot achieve a fast and efficient combustion process and cannot achieve a good combustion effect. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an air intake system and control method for horseshoe flame low-NOx combustion kilns, which solves the problem that the air intake rate determined by the original method is not the optimal air intake rate and can only ensure that the corresponding kiln can carry out normal combustion processing.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: an air intake system for a horseshoe flame low-NOx combustion kiln, wherein the data acquisition end collects the past operating parameters of the horseshoe flame low-NOx combustion kiln and transmits the collected operating parameters to the interval confirmation end, wherein the operating parameters include the heating rate corresponding to different air intake rates;

[0006] At the interval confirmation end, the internal graphics construction unit constructs a graphics of the corresponding combustion kiln based on the different collected working parameters, and then transmits the constructed graphics of the working parameters to the graphics capture unit. The specific method is as follows:

[0007] A two-dimensional coordinate system is constructed with the intake rate parameter as the horizontal coordinate axis and the heating rate parameter as the vertical coordinate axis.

[0008] Based on the specific values ​​of different working parameters, select the corresponding points in the two-dimensional coordinate system, connect several points to confirm the corresponding working parameter graphic, and then transfer the confirmed working parameter graphic to the graphic capture unit.

[0009] The numerical input terminal inputs the working temperature and temperature rise range of the kiln. The input working temperature is transmitted to the control terminal, and the input temperature rise range is transmitted to the graphic capture unit.

[0010] The graphic capture unit receives the input temperature rise range value, captures the corresponding line segment inside the working parameter graphic based on this range value, marks the line segment inside this range value as the line segment to be analyzed, and transmits the marked line segment to be analyzed to the interval locking unit.

[0011] The interval locking unit receives the line segment to be analyzed, performs trend analysis, selects the group of line segments with the largest trend value from several groups of line segments to be analyzed, selects the corresponding intake rate interval from the line segments to be analyzed, and transmits the selected intake rate interval to the control terminal. The specific method is as follows:

[0012] From several sets of line segments to be analyzed, the working parameters of each different point in the line segment are confirmed. The trend parameter is calculated as: heating rate difference ÷ air intake rate difference. Each difference is calculated by subtracting the value of the front point from the value of the rear point. The trend parameters of several sets of line segments to be analyzed are averaged to obtain the verification average value of the corresponding line segments to be analyzed.

[0013] From the average values ​​generated by several sets of line segments to be analyzed, select the maximum value and mark the corresponding line segment to be analyzed as the best line segment. Confirm the intake rate parameters at both ends of this best line segment, bundle the two confirmed intake rate parameters into an intake rate range, and transmit this intake rate range to the control terminal.

[0014] The control terminal controls the air intake rate of the kiln according to the air intake rate range and heats it up until it reaches the working temperature and then stops.

[0015] Preferably, it also includes a screen analysis terminal, which includes a burning screen acquisition unit, an analysis unit, and a missing duration determination unit.

[0016] The combustion image acquisition unit acquires combustion images inside the kiln and transmits the real-time acquired combustion images to the analysis unit.

[0017] The analysis unit confirms the area parameters of the collected combustion images, then confirms the specific height of the corresponding combustion images, analyzes whether the corresponding combustion images are fully burned, and marks images that are not fully burned as missing images, transmitting the missing images to the missing duration determination unit; specifically, the method is as follows:

[0018] Confirm the burning scene against the preset grid template, where each grid represents an area parameter.

[0019] Confirm the number of grid cells completely covered by the burning screen and mark them as GS. i , where i represents different burning scenes, and the grids that are not fully covered are marked as half-selected grids;

[0020] Analyze the area proportion parameters of several half-selected squares, and sum the area proportion parameters of different half-selected squares to obtain the sum value QH. i Then use GS i +QH i =MJ i The area value MJ corresponding to the burning scene is obtained. i ;

[0021] The specific height of the corresponding burning image is marked as GD. i ,use Obtain the standard value BZ corresponding to the combustion scene. i C1 and C2 are both preset fixed coefficient factors, where e is the natural base, and the standard value BZ is used. i The value is compared with the preset parameter Ys, and the standard value BZ is evaluated. i Does it meet the BZ requirement? i If ≥Ys, no processing is performed; otherwise, the corresponding burning scene is marked as a missing scene, and the marked missing scene is transmitted to the missing duration determination unit.

[0022] Preferably, the missing duration determination unit receives the missing image and determines the specific duration of the actual image. The control terminal then adds the determined specific duration to the original heating duration and performs combustion processing on the component to be burned.

[0023] A method for controlling the air intake of a horseshoe-flame low-NOx combustion kiln includes the following steps:

[0024] Step 1: Prioritize collecting past operating parameters of the kiln and construct an operating parameter graph for the corresponding combustion kiln from the collected operating parameters.

[0025] Step 2: Input the temperature rise range value of the corresponding kiln, extract the corresponding line segment inside the working parameter graph, and mark the line segment inside this range value as the line segment to be analyzed.

[0026] Step 3: From several groups of line segments to be analyzed, select the group of line segments with the largest trend value, and from the line segments to be analyzed, select the corresponding intake rate range, and transmit the selected intake rate range to the control terminal.

[0027] Step 4: The control unit controls the air intake rate of the kiln according to the air intake rate range and heats up the temperature until it reaches the working temperature and then stops.

[0028] Beneficial effects

[0029] This invention provides an air intake system and control method for a horseshoe flame low-NOx combustion kiln. Compared with the prior art, it has the following advantages:

[0030] This invention analyzes past operating parameters to identify the corresponding operating waveform curve. Subsequently, based on the input range value, the waveform curve is analyzed and truncated. Several line segments to be analyzed are identified during the truncation process. Then, the group of line segments with the largest parameter is selected from these line segments, and the corresponding rate range is determined. Subsequently, air is introduced and heated according to this air intake rate range. By adopting this air intake method, the overall combustion rate of the kiln can be improved, the combustion performance can be enhanced, the combustion time can be reduced, and the overall performance of the kiln can be improved.

[0031] During the combustion process, the internal combustion image of the kiln is confirmed and analyzed. Based on the analysis results, it can be determined whether the corresponding kiln is burning sufficiently. If there is insufficient combustion, the duration of insufficient combustion is determined, and the duration of the combustion process is extended through the control terminal to improve the overall combustion effect of the kiln. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the principle framework of the present invention;

[0033] Figure 2 This is a schematic diagram of the principle framework of the interval confirmation end of the present invention;

[0034] Figure 3 This is a schematic diagram of the principle framework of the screen analysis terminal of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0036] Example 1

[0037] Please see Figure 1 This application provides an air intake system for a horseshoe flame low-NOx combustion kiln, including a numerical input terminal, a data acquisition terminal, a range confirmation terminal, a screen analysis terminal, and a control terminal;

[0038] The numerical input terminal and the data acquisition terminal are both electrically connected to the interval confirmation terminal input node, the interval confirmation terminal is electrically connected to the screen analysis terminal input node, and the screen analysis terminal is electrically connected to the control terminal input node.

[0039] Please see Figure 2 The interval confirmation end includes a graphics construction unit, an image cropping unit, and an interval locking unit, wherein the graphics construction unit is electrically connected to the input node of the graphics cropping unit, and the graphics cropping unit is electrically connected to the input node of the interval locking unit.

[0040] Please see Figure 3 The image analysis terminal includes a combustion image acquisition unit, an analysis unit, and a missing duration determination unit, wherein the combustion image acquisition unit is electrically connected to the input node of the analysis unit, and the analysis unit is electrically connected to the input node of the missing duration determination unit.

[0041] The numerical acquisition terminal collects the past operating parameters of the horseshoe flame low-NOx combustion kiln and transmits the collected operating parameters to the interval confirmation terminal. The operating parameters include the heating rate corresponding to different air intake rates. The interval between the heating rate and the air intake rate is in minutes. This means that the specific temperature change is determined when the air intake rate is fixed, and the corresponding heating rate can be confirmed.

[0042] The interval confirmation end, with its internal graphics construction unit, constructs a graphics of the corresponding combustion kiln based on the different collected operating parameters, and transmits the constructed graphics of the operating parameters to the graphics capture unit. The specific method for constructing the graphics of the operating parameters is as follows:

[0043] A two-dimensional coordinate system is constructed with the intake rate parameter as the horizontal coordinate axis and the heating rate parameter as the vertical coordinate axis.

[0044] Based on the specific values ​​of different working parameters, select the corresponding points in the two-dimensional coordinate system, connect several points to confirm the corresponding working parameter graph, and then transmit the confirmed working parameter graph to the graph capture unit.

[0045] The numerical input terminal inputs the kiln's operating temperature and temperature rise range. The input operating temperature is transmitted to the control terminal, and the input temperature rise range is transmitted to the graphic capture unit. Specifically, the temperature rise range needs to be input in advance because the rate of temperature rise affects the kiln's combustion degree. Some parts to be burned need to be burned slowly and thoroughly, while others need to be burned quickly to achieve a rapid temperature rise and combustion. Therefore, it is necessary to control the corresponding temperature rise range to control the degree of combustion.

[0046] The graphic capture unit receives the input temperature rise range value, captures the corresponding line segment inside the working parameter graphic based on this range value, marks the line segment inside this range value as the line segment to be analyzed, and transmits the marked line segment to be analyzed to the interval locking unit. Specifically, based on this range value, the corresponding endpoint value is selected in the Y-axis, and a dividing line parallel to the X-axis is drawn using this endpoint value to confirm the upper and lower dividing lines. The line segment inside the two dividing lines is confirmed, and the confirmed line segment is marked as the line segment to be analyzed.

[0047] The interval locking unit receives the line segment to be analyzed, performs trend analysis, selects the group of line segments with the largest trend value from several groups of line segments to be analyzed, selects the corresponding intake rate interval from the line segments to be analyzed, and transmits the selected intake rate interval to the control terminal. The specific method for selecting the intake rate interval is as follows:

[0048] From several sets of line segments to be analyzed, the working parameters of each different point in the line segment are confirmed. The trend parameter is calculated as: heating rate difference ÷ air intake rate difference. Each difference is calculated by subtracting the value of the front point from the value of the rear point. The trend parameters of several sets of line segments to be analyzed are averaged to obtain the verification average value of the corresponding line segments to be analyzed.

[0049] From the average values ​​generated by several sets of line segments to be analyzed, select the maximum value and mark the corresponding line segment to be analyzed as the best line segment. Confirm the intake rate parameters at both ends of this best line segment, bind the two confirmed intake rate parameters into an intake rate range, and transmit this intake rate range to the control terminal.

[0050] The control terminal controls the air intake rate of the kiln according to the air intake rate range and heats it up until it reaches the working temperature and then stops.

[0051] Example 2

[0052] In the implementation of this embodiment, the specific differences compared to Embodiment 1 are as follows:

[0053] The combustion image acquisition unit collects combustion images inside the kiln and transmits the real-time collected combustion images to the analysis unit. Specifically, the instruments used for image acquisition are all specialized instruments with extremely strong heat resistance and heat dissipation, and their installation positions are specified by external operators.

[0054] The analysis unit confirms the area parameters of the collected combustion images, then confirms the specific height of the corresponding combustion images, analyzes whether the corresponding combustion images are fully burned, and marks images that are not fully burned as missing images, transmitting the missing images to the missing duration determination unit. The specific method of analysis is as follows:

[0055] Confirm the burning scene against the preset grid template. The grid template is a preset template, and each group of grids represents an area parameter. The unit of the area parameter is determined in advance by the operator.

[0056] Confirm the number of grid cells completely covered by the burning screen and mark them as GS. i , where i represents different burning scenes, and the grids that are not fully covered are marked as half-selected grids;

[0057] Analyze the area proportion parameters of several half-selected squares, and sum the area proportion parameters of different half-selected squares to obtain the sum value QH. i Then use GS i +QH i =MJ i The area value MJ corresponding to the burning scene is obtained. i ;

[0058] The specific height of the corresponding burning image is marked as GD. i ,use Obtain the standard value BZ corresponding to the burning image. i C1 and C2 are both preset fixed coefficient factors, where e is the natural base, and the standard value BZ is used. i The value of Ys is compared with the preset parameter Ys, where the specific value of Ys is determined by the operator based on experience, and the standard value BZ is evaluated. i Does it meet the BZ requirement? i If ≥Ys, no processing is performed; otherwise, the corresponding burning image is marked as a missing image, and the marked missing image is transmitted to the missing duration determination unit.

[0059] Specifically, by analyzing the corresponding area parameters and specific height, the degree of combustion of the corresponding combustion scene can be determined. By analyzing the degree of combustion, the specific combustion situation of the corresponding kiln can be known, and a comprehensive analysis and evaluation can be carried out to judge the overall degree of combustion of the corresponding kiln.

[0060] The missing duration determination unit receives the missing image, determines the specific duration of the actual image, and transmits the determined specific duration to the control terminal. The control terminal adds the determined specific duration to the original heating duration and performs combustion processing on the component to be burned.

[0061] Example 3

[0062] A method for controlling the air intake of a horseshoe-flame low-NOx combustion kiln includes the following steps:

[0063] Step 1: Prioritize collecting past operating parameters of the kiln and construct an operating parameter graph for the corresponding combustion kiln from the collected operating parameters.

[0064] Step 2: Input the temperature rise range value of the corresponding kiln, extract the corresponding line segment inside the working parameter graph, and mark the line segment inside this range value as the line segment to be analyzed.

[0065] Step 3: From several groups of line segments to be analyzed, select the group of line segments with the largest trend value, and from the line segments to be analyzed, select the corresponding intake rate range, and transmit the selected intake rate range to the control terminal.

[0066] Step 4: The control unit controls the air intake rate of the kiln according to the air intake rate range and heats up the temperature until it reaches the working temperature and then stops.

[0067] Example 4

[0068] In its specific implementation, this embodiment includes all the implementation processes of the above three sets of embodiments.

[0069] Some of the data in the above formulas are numerical calculations with dimensions removed, and the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0070] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. An air intake system for a horseshoe-flame low-NOx combustion kiln, characterized in that, include: The numerical acquisition end collects the past operating parameters of the horseshoe flame low-NOx combustion kiln and transmits the collected operating parameters to the interval confirmation end. The operating parameters include the heating rate corresponding to different air intake rates. In the interval confirmation end, the internal graphics construction unit constructs a working parameter graphic belonging to the corresponding combustion kiln based on the different working parameters collected, and transmits the constructed working parameter graphic to the graphics capture unit. The numerical input terminal inputs the working temperature and temperature rise range of the kiln. The input working temperature is transmitted to the control terminal, and the input temperature rise range is transmitted to the graphic capture unit. The graphic capture unit receives the input temperature rise range value, captures the corresponding line segment inside the working parameter graphic based on this range value, marks the line segment inside this range value as the line segment to be analyzed, and transmits the marked line segment to be analyzed to the interval locking unit. The interval locking unit receives the line segment to be analyzed, performs trend analysis, selects the line segment with the largest trend value from several groups of line segments to be analyzed, selects the corresponding intake rate interval from the line segment to be analyzed, and transmits the selected intake rate interval to the control terminal. The control terminal controls the air intake rate of the kiln according to the air intake rate range and heats it up until it reaches the working temperature and then stops.

2. The horseshoe flame low-NOx combustion kiln air intake system according to claim 1, characterized in that, The specific method for constructing the working parameter graph at the interval confirmation end is as follows: A two-dimensional coordinate system is constructed with the intake rate parameter as the horizontal coordinate axis and the heating rate parameter as the vertical coordinate axis. Based on the specific values ​​of different working parameters, select the corresponding points in the two-dimensional coordinate system, connect several points to confirm the corresponding working parameter graph, and then transmit the confirmed working parameter graph to the graph capture unit.

3. The horseshoe flame low-NOx combustion kiln air intake system according to claim 2, characterized in that, The specific method by which the interval locking unit selects the intake rate interval is as follows: From several sets of line segments to be analyzed, the working parameters of each different point in the line segment are confirmed. The trend parameter is calculated as: heating rate difference ÷ air intake rate difference. Each difference is calculated by subtracting the value of the front point from the value of the rear point. The trend parameters of several sets of line segments to be analyzed are averaged to obtain the verification average value of the corresponding line segments to be analyzed. From the average values ​​generated by several sets of line segments to be analyzed, select the maximum value and mark the corresponding line segment to be analyzed as the best line segment. Confirm the intake rate parameters at both ends of this best line segment, bind the two confirmed intake rate parameters into an intake rate range, and transmit this intake rate range to the control terminal.

4. A method for controlling the air intake of a horseshoe-flame low-NOx combustion kiln, wherein the control method operates according to any one of claims 1-3 of the horseshoe-flame low-NOx combustion kiln air intake system, characterized in that, Includes the following steps: Step 1: Prioritize collecting past operating parameters of the kiln and construct an operating parameter graph for the corresponding combustion kiln from the collected operating parameters. Step 2: Input the temperature rise range value of the corresponding kiln, extract the corresponding line segment inside the working parameter graph, and mark the line segment inside this range value as the line segment to be analyzed. Step 3: From several groups of line segments to be analyzed, select the group of line segments with the largest trend value, and from the line segments to be analyzed, select the corresponding intake rate range, and transmit the selected intake rate range to the control terminal. Step 4: The control unit controls the air intake rate of the kiln according to the air intake rate range and heats up the temperature until it reaches the working temperature and then stops.

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