CN210004445U - Boiler fresh air self-balancing adjusting equipment - Google Patents
Boiler fresh air self-balancing adjusting equipment Download PDFInfo
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Abstract
The utility model relates to an kinds of boiler new trend self-balancing adjusting device, it is through adjusting a plurality of times a plurality of wind , make the new amount of wind that wind lets in reach the balance with the coal-fired volume, include the new fan for air delivery, with new fan air outlet department links to each other, is used for controlling the wind pipeline of new trend output volume, set up the boiler of wind pipeline output end, the boiler is inside to be equipped with the fire coal, is used for receiving the air and burns and produce the heat, with wind pipeline links to each other, is used for detecting and controlling the control unit of new trend output volume in the wind pipeline, the utility model discloses a carry out a plurality of times to wind and detect and adjust, can accomplish the control to wind pipeline stroke aperture progressively to accomplish the accurate matching to the wind coal-fired ratio in the boiler progressively.
Description
Technical Field
The utility model relates to a heating temperature self-interacting technical field especially relates to kinds of boiler new trend self-balancing adjusting equipment.
Background
The optimal condition of boiler combustion is the accurate matching of air-coal ratio, in the matching process, the boiler adopts new fans to supply air, a plurality of air is blown in, the opening proportion of the air is samples due to various reasons of air design and installation positions, but the deviation of the fresh air blown into the boiler is very large for every air , a traditional industry fireman adopts an air opening control method, the fresh air cannot be accurately controlled, the boiler hearth combustion is unbalanced, some hearth positions are burnt completely (the fresh air is larger than the oxygen needed by fire coal), some hearth positions are burnt insufficiently (the fresh air is smaller than the oxygen needed by fire coal), energy waste and equipment operation efficiency are reduced.
Chinese patent publication No. CN206545939U discloses boiler combustion systems, which include a boiler, a air channel for providing times of air to the boiler, a secondary air channel for providing secondary air to the boiler, a cold air loop for providing pressure cold air to the boiler, a smoke exhaust pipeline connected with a smoke outlet of the boiler, and a smoke loop arranged among the air channels, the second air channel and the smoke exhaust pipeline, wherein the smoke loop comprises a smoke backflow section, a fresh air section and an air mixing section, wherein the end of the smoke backflow section, the end of the smoke backflow section and the end of the air mixing section are in butt joint, the second end of the smoke backflow section is connected with the smoke exhaust pipeline between an electric dust removal system and a chimney, the second end of the fresh air section is used for introducing fresh air, the second end of the air mixing section is connected with the -time side air channel and the secondary-side air channel of the boiler combustion system, an induced draft fan arranged at the second end of the smoke backflow section, and a blower arranged at the second end of the fresh air section, therefore, the:
, the system only uses two flue gas pipelines, and can not supplement fresh air to the boiler in all directions, so that the deviation of the fresh air in the boiler is large, and the fire coal in the boiler can not be fully combusted.
Secondly, a device for adjusting the air flow inside the flue gas pipeline of the system is not arranged in the flue gas pipeline, and the air flow in the pipeline cannot be controlled when the boiler operates, so that the air-coal ratio in the boiler cannot be accurately matched.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides an kinds of boiler new trend self-balancing check out test set for overcome the problem that the wind-coal ratio can't accurately match among the prior art in the boiler.
In order to achieve the above object, the utility model provides an kinds of boiler new trend self-balancing controlgear, include:
a fresh air blower for delivering air;
an air pipeline connected with the air outlet of the fresh air fan and used for controlling fresh air output quantity;
the boiler is arranged at the output end of the wind pipeline, and fire coal is arranged in the boiler and used for receiving air and combusting to generate heat;
and the control unit is connected with the wind pipeline and is used for detecting and controlling the output quantity of fresh wind in the wind pipeline.
, at least ten conveying pipelines are arranged in the wind pipeline in parallel.
, wind is arranged in each branch pipeline of the wind pipeline.
, each wind is opened by 50% before the equipment is operated, so as to reserve the adjusting margin of each wind .
, the control unit includes:
the timing module is connected with the boiler and used for recording the operation time of the boiler;
a detection module connected to the wind duct for detecting an inlet temperature of each wind in the wind duct;
the calculation module is connected with the detection module and is used for counting and calculating the temperature measured by the detection module;
and the control module is connected with the wind pipeline and used for controlling the opening degree of the wind inside the control module.
, a temperature detector is externally connected to the detection module and is disposed at each wind inlet to detect the temperature at each wind inlet and transmit the detected temperature value to the detection module.
, the control unit detects and adjusts the air duct at least four times, including coarse, fine and post adjustments, to ensure equal air flow in each branch of the air duct.
, when the control unit performs coarse tuning, the number of the high-temperature group and the low-temperature group extracted by the calculation module is 30% of the total data amount;
when the control unit performs coarse adjustment, the quantity of the high-temperature group and the low-temperature group extracted by the calculation module is 20% of the total data quantity;
when the control unit carries out coarse adjustment, the quantity of the high-temperature group and the low-temperature group extracted by the calculation module is 10% of the total data quantity;
when the control unit carries out coarse adjustment, the number of the high-temperature groups and the low-temperature groups extracted by the calculation module is 1.
Compared with the prior art, the beneficial effects of the utility model reside in that, the utility model discloses a carry out a lot of to wind and detect and adjust, can accomplish the control to wind pipeline apoplexy aperture gradually to accomplish gradually the accurate matching to the boiler internal wind coal ratio.
In particular, a plurality of parallel conveying pipelines are arranged in the wind pipeline, and the conveying pipelines are uniformly connected with the outer wall of the boiler, so that air can enter the boiler from a plurality of directions, and the sufficient air in the boiler is ensured.
, the opening degree of each wind is set at 50% before the equipment operates, so that when the wind is adjusted, sufficient adjustment allowance of each wind can be guaranteed, the situation that the opening degree of the wind reaches the limit in the adjustment process, the opening degree cannot be increased or reduced continuously is avoided, and the adjustment precision of the equipment is improved.
, the timing module in the control unit will time the operation time of the boiler, and by restricting the operation time, relatively equal statistical data can be obtained, thereby steps can be taken to improve the adjustment precision of the equipment.
Particularly, the detection module is provided with the externally-connected temperature detectors at the inlets of the wind respectively, and the temperature at the inlet of the wind is checked to determine whether the air inflow in the pipeline where the wind is located is sufficient or not, so that the air flow in each pipeline can be accurately and quickly detected, and the detection precision of the device is improved.
Particularly, the calculation module can calculate the detected data and count the calculation result, and the wind with too high and too low temperature can be quickly and accurately found through the calculation and the statistics of the data, so that the detection efficiency of the equipment is improved by a step .
, when the device is adjusted for a plurality of times, the number of the adjusted wind can be gradually reduced, the operation is simple and convenient, and the temperature in the boiler can be stably adjusted.
Drawings
Fig. 1 is the utility model discloses a boiler new trend self-balancing controlgear's schematic structure diagram.
Detailed Description
In order to make the objects and advantages of the invention more apparent, the invention is described in with reference to the following embodiments, it being understood that the specific embodiments described herein are only for the purpose of illustrating the invention and are not to be construed as limiting the invention.
The above and further features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" in the description of the present invention shall be construed as , for example, they may be fixedly connected, detachably connected, or physically connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, and communicating between two elements.
Please refer to fig. 1, which is a schematic structural diagram of a new air self-balancing adjusting device of a boiler according to the present invention, including a new air blower 1, an air pipeline 2, a boiler 3 and a control unit 4, wherein an inlet of the air pipeline 2 is connected to an air outlet of the new air blower 1 to deliver air output by the new air blower 1, the boiler 3 is connected to an outlet of the air pipeline 2 to receive air delivered by the air pipeline to combust coal inside the boiler 3 and generate heat, the control unit 4 is respectively connected to the air pipeline 2 and the boiler 3 to detect an operation condition of the device and adjust a flow rate of air in the air pipeline 2, when the device operates, the new air blower 1 starts blowing air and outputs the air to the air pipeline 2, the air pipeline 2 delivers air to the boiler 3, the boiler 3 combusts coal inside the boiler 3 to generate heat, when the device operates, the control unit 4 records an operation time of the boiler 3 and controls a flow rate of air in the boiler 354 to adjust a working temperature of the boiler 3, and the boiler 3 can be adjusted according to a specific air flow rate after the device operates, the air flow rate detection and the air flow rate can be adjusted by a specific air flow rate detection unit that the air flow rate detection and a working temperature adjustment unit can be calculated by using air flow rate detection unit .
As shown in fig. 1, the fresh air machine 1 of the present invention is connected to the wind pipeline 2 to deliver air to the wind pipeline 2, when the device starts to operate, the fresh air machine 1 starts to start up to suck and output air in the environment to the wind pipeline 2, it can be understood that the type of the fresh air machine 1 may be a self-balancing fresh air machine, a humidity-controlled fresh air machine, a bidirectional heat recovery fresh air machine, or another type of fresh air machine, as long as the requirement that the fresh air machine 1 can deliver air to the wind pipeline 2 during operation is satisfied.
Please refer to fig. 1, an inlet of the wind pipeline 2 of the present invention is connected to the fresh air fan 1 for conveying the air output by the fresh air fan 1, an outlet of the wind pipeline 2 is 10 parallel pipelines uniformly disposed on the sidewall of the boiler 3 and connected thereto for conveying the air to the interior of the boiler 3, a wind 21 is disposed in each branch of the wind pipeline 2 for controlling the air flow rate in each branch according to the opening, the wind 21 is set to 50% opening when the wind pipeline 2 conveys the air, and the control unit 4 adjusts the opening of the wind 21 according to the combustion condition of the coal in the boiler 3 to achieve the precise matching of the wind-coal ratio in the boiler 3.
As shown in fig. 1, the control unit 4 of the present invention is connected to the wind pipeline 2 and the boiler 3 respectively, and is configured to adjust the air flow rate of each branch in the wind pipeline 2, and includes a timing module 41, a detection module 42, a calculation module 43, and a control module 44, wherein the timing module 41 is connected to the boiler 3 and is configured to record the operation time of the boiler 3, the detection module 42 is connected to each wind 21 respectively and is configured to detect the inlet temperature of each wind 21, the calculation module 43 is connected to the detection module 42 and is configured to calculate the temperature value measured by the detection module 42, and the control module 44 is connected to each wind 21 respectively and is configured to control the designated wind 21 to adjust the opening degree according to the calculation result of the calculation module 43.
When the equipment is operated, the timing module 41 starts to record the operation time of the boiler 3, when the operation time of the passing reaches the rated time, the detection module 42 starts to detect the air temperature at the inlets of the wind 21 in the wind pipeline 2, the detection module 42 transmits the detected data to the calculation module 43 and the timing module 41 performs zero clearing timing, the calculation module 43 performs statistics and calculation on the transmitted data, selects the wind 21 with overhigh and overlow temperature after calculation, and sends a control signal to the control module 44 to control the designated wind 21, and controls the air flow of the branch where the wind is located by adjusting the opening of the wind 21.
Specifically, the detection module 42 is externally connected with temperature detectors, which are respectively arranged at the inlets of the wind 21 and are used for measuring the temperature at the inlet of each wind 21, when the detection module 42 measures the temperature at the inlet of the wind 21, the temperature detectors start to measure the temperature at the inlet of the wind 21 and transmit the measured data to the detection module 42, and it is understood that the type of the temperature detectors is not particularly limited as long as the temperature detectors can accurately detect the temperature at the inlet of each wind 21.
Specifically, the calculation module 43 is connected to the detection module 42 and configured to count and calculate data measured by the detection module 42, after the detection module 42 detects the inlet temperature of the wind 21, the detected temperature value is transmitted to the calculation module 43, the calculation module 43 establishes a table for the data and calculates an average value in the data, the average value is subtracted from each temperature data to calculate a temperature difference of each wind 21, each temperature difference is compared with the average temperature to calculate a temperature error percentage, and a specified number of high-temperature groups and low-temperature groups are extracted according to the error percentage.
Specifically, the control module 44 is connected to each of the winds 21, and is configured to control the designated wind 21 to adjust the opening degree thereof to adjust the air flow rate of the branch in which the wind 21 is located, when the calculation module 43 extracts a designated number of high-temperature groups and low-temperature groups, the control module 44 sends a control signal to the control module 44, and after receiving the control signal, the control module 44 controls the designated wind 21 to adjust the opening degree, so as to ensure the air flow rate of each branch in the wind pipeline 2.
Example 1
This embodiment will use boiler new trend self-balancing controlgear is right airflow adjusts in wind pipeline 2, wherein be equipped with ten branch road pipelines in the wind pipeline 2, five settings are at 3 left side walls of boiler, and five settings are at 3 right side walls of boiler.
Specifically, this embodiment the cylindrical barrel is selected for use to the boiler, and its heating process includes:
(1) stage
Step a1, setting the stage temperature to be reached by the boiler as t1The th stage temperature t will be reached1The required time is set to T1In the invention, because the boiler is heated by selecting the resistor and utilizing an electric heating method, the resistor needs to be selected in the stage;
w is the amount of heat required to heat the boiler to the th stage temperature1Then W is1The following can be obtained by the formula (1):
W1＝cmΔt1(1)
wherein c is the air concentration in the boiler, m is the quality of the coal in the boiler, and delta t1Is the initial temperature t in the boiler0Raising the temperature to stage temperature t1Temperature difference of time;
step b 1: calculate W1Then, the heat W was expressed by the formula (2) to determine the heat W at the th stage of production1Required stage power P1：
W1＝ηP1T1(2)
η is the heat absorption efficiency of the air in the boiler;
step c1, calculating the power P of stage1Then, a specific resistance value R of the resistor is obtained by using an equation (3) according to a voltage U used by the resistor:
step d 1: the resistance value R can be determined by equation (4):
R＝ρls (4)
rho is resistivity, the specific numerical value of the rho is related to the material of the resistance, l is the length of the resistance wire, and s is the sectional area of the resistance wire;
step e 1: the radius of the resistance wire interface is r, the sectional area s of the resistance wire is pi r2Then, the compound is brought into formula (4) to obtain:
R＝ρlπr2(5)
assuming that the height of the boiler is H and the diameter is d, equation (6) can be obtained:
wherein
The length l and the section radius r of the resistance wire can be calculated for the number of turns of the resistance wire wound on the cracking reaction kettle through the formula;
step f 1: after l and R are solved, the resistivity rho is solved according to the required resistance value R by using the formula (5), a material corresponding to the resistivity rho is selected as a resistance wire, and the resistance wire is used for heating the cracking reaction kettle by using a specified voltage value U after the installation is finished, so that the pretreated waste oil can be heated to a specified temperature within a specified time;
(2) second stage
When the th stage is completed, the control system controls the heating temperature of the resistance to maintain the temperature of the boiler in fixed range;
since in the second stage the standard temperature t of the boiler is2And the second stage temperature t1And the control system does not need to adjust parameters in the second stage, so that the heat emitted by the resistance wire is the same as the heat in the boiler, and the heat of the resistance wire and the heat in the boiler cannot be transferred or transferred according to the law of thermal conservation, so that the temperature in the boiler is maintained within a specified range.
At the beginning of adjustment, the opening of all the winds 21 is set to 50%, and coarse adjustment, fine adjustment, accurate adjustment and supplementary adjustment are respectively performed, wherein:
the coarse adjustment step comprises the steps of measuring the inlet temperature of each wind 21, establishing a spreadsheet according to th time of measured temperature data, calculating a temperature average, subtracting the average temperature from the temperature measured by each inlet to calculate each temperature difference, comparing each temperature difference with the average temperature of fresh air to calculate the percentage of temperature error, establishing three groups of data according to the error number, namely a highest temperature of 30% 0 group, a lowest temperature of 30% 1 group and a residual 40% 2 group, adjusting the highest temperature of group, adjusting the opening degree of the fresh air 21 according to the error proportion, adjusting the lowest temperature of group, adjusting the opening degree of the fresh air 21 according to the error proportion, adjusting the residual group for 30 minutes through th time without adjustment, allowing the boiler equipment to run for 30 minutes, and re-coupling the fresh air according to the adjustment proportion, and re-measuring the temperature of each fresh air inlets.
The fine adjustment step comprises the steps of measuring the inlet temperature of each wind 21 after times of adjustment is finished, establishing a spreadsheet for inputting the measured temperature for the second time, calculating the average of the inlet temperatures, subtracting the average temperature from the temperature measured by each wind 021 to calculate the temperature difference of each fresh wind 2, comparing the temperature difference of each fresh wind with the average temperature of wind 21 to calculate the temperature error percentage, establishing three groups of data by using the error number, namely a maximum temperature group of 20% 1, a minimum temperature group of 20% 3 and a residual 60% 4, adjusting a maximum temperature group of , adjusting the opening degree of the fresh wind 21 according to the error ratio, adjusting a minimum temperature group of , adjusting the opening degree of the wind 21 according to the error ratio, not adjusting the residual group, operating the boiler equipment for 30 minutes through the second adjustment, re-coupling the fresh wind according to the adjustment ratio, and measuring the inlet temperature of each new wind of .
The method comprises the steps of measuring the temperature of an inlet of each wind 21 after the second adjustment is finished, establishing a spreadsheet for inputting the measured temperature for the third time, calculating the average of the inlet temperatures, subtracting the average temperature from the temperature measured by the inlet of each wind 21 to calculate the temperature difference of each fresh wind 1, comparing the temperature difference of each fresh wind with the average temperature of the wind 21 to calculate the temperature error percentage, establishing three groups of data by using the error number, namely a maximum temperature 10% 0 group, a minimum temperature 10% 2 group and a residual 80% 3 group, adjusting the maximum temperature group, adjusting the opening degree of the wind 21 according to the error ratio, adjusting the minimum temperature group, increasing the opening degree of the wind 21 according to the error ratio, not adjusting the residual group, operating the boiler equipment for 30 minutes through the third adjustment, re-coupling the fresh wind according to the adjustment ratio, and measuring the temperature of each fresh wind inlets.
The supplementary regulation step comprises the steps of measuring the inlet temperature of each wind 21 after the third regulation is finished, establishing a spreadsheet for inputting the measured temperature for the fourth time, calculating the average of the inlet temperature, subtracting the average temperature from the temperature measured by each wind 21 inlet to calculate the temperature difference of each fresh wind 0, comparing the temperature difference of each fresh wind 1 with the average temperature of the wind 21 to calculate the temperature error percentage, establishing three groups of data of error numbers, namely a maximum temperature 2, a minimum temperature and a residual , then regulating the maximum temperature wind 21, regulating the opening of the small wind 21 according to the error ratio, regulating the minimum temperature wind 21, regulating the opening of the wind 21 according to the error ratio, and not regulating the residual groups to ensure that the wind-coal ratio in the boiler 3 reaches the specified ratio.
The parameters of each wind 21 after coarse adjustment of the device are shown in table 1:
TABLE 1
The adjusting method comprises the following steps: 16 × 30% ═ 4.8, the number of adjustments was at least 4 and at most 5.
8 wind over 55.5 degrees, 4 adjusted.
5 wind with the temperature lower than 55.5 degrees and 4 wind with the temperature lower than 55.5 degrees are adjusted.
The remaining 8 winds are automatically coupled to form a new balance.
The parameters of each wind 21 after the device is finely tuned are shown in table 2:
TABLE 2
The adjusting method comprises the following steps: 16 × 20% ═ 3.2, the number was adjusted to 3.
8 wind over 53.6 degrees, 3 regulation.
6 wind with the temperature lower than 53.6 degrees are adjusted by 3.
The remaining 12 winds are automatically coupled to form a new balance.
The parameters of each wind 21 after the apparatus was calibrated are shown in table 3:
TABLE 3
The adjusting method comprises the following steps: 16 × 10% ═ 1.6, the number was adjusted to 2.
4 wind with the temperature exceeding 52 degrees and 2 wind with the temperature exceeding 52 degrees are adjusted.
7 wind with the temperature lower than 52 degrees are adjusted for 1.
The remaining 13 winds are automatically coupled to form a new balance.
The parameters of each wind 21 after the device is adjusted are shown in table 4:
TABLE 4
The adjusting method comprises the following steps:
1 wind with the wind of over 52 degrees are adjusted by 1.
1 wind with the wind of less than 52 degrees are adjusted by 1.
Equilibrium is reached.
According to the four tables, the air flow is adjusted to be accurate to 2.8 thousandths, and the accurate time is about 5 times.
So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1, kinds of boiler new trend self-balancing adjusting equipment, its characterized in that includes:
a fresh air blower for delivering air;
an air pipeline connected with the air outlet of the fresh air fan and used for controlling fresh air output quantity;
the boiler is arranged at the output end of the wind pipeline, and fire coal is arranged in the boiler and used for receiving air and combusting to generate heat;
and the control unit is connected with the wind pipeline and used for detecting and controlling the fresh wind output quantity in the wind pipeline, and a control module is arranged in the control unit and used for controlling the wind opening degree in the wind pipeline so as to adjust the combustion air quantity.
2. The boiler fresh air self-balancing adjusting device of claim 1, wherein at least ten conveying pipelines are arranged in the wind pipeline and are connected in parallel.
3. The boiler fresh air self-balancing regulation device of claim 2, characterized in that wind is provided in each branch duct of the wind ducts.
4. The boiler fresh air self-balancing regulating device of claim 3, wherein each of the air is set to 50% open before the device is operated to reserve a regulating margin of each air .
5. The boiler fresh air self-balancing adjusting device of claim 1, wherein the control unit comprises:
the timing module is connected with the boiler and used for recording the operation time of the boiler;
a detection module connected to the wind duct for detecting an inlet temperature of each wind in the wind duct;
the calculation module is connected with the detection module and is used for counting and calculating the temperature measured by the detection module;
and the control module is connected with the wind pipeline and used for controlling the opening degree of the wind inside the control module.
6. The boiler fresh air self-balancing regulation device of claim 5, wherein the detection module is externally connected with a temperature detector, and the temperature detector is arranged at the inlet of each wind and is used for detecting the temperature at the inlet of each wind and transmitting the detected temperature value to the detection module.
7. The boiler fresh air self-balancing regulating device of claim 5, wherein the control unit detects and regulates the air duct at least four times, including coarse, fine and supplementary, to ensure the same air flow in each branch of the air duct.
8. The boiler fresh air self-balancing adjusting device of claim 7, wherein when the control unit performs coarse adjustment, the number of the high-temperature groups and the low-temperature groups extracted by the calculation module is 30% of the total data amount;
when the control unit performs coarse adjustment, the quantity of the high-temperature group and the low-temperature group extracted by the calculation module is 20% of the total data quantity;
when the control unit carries out coarse adjustment, the quantity of the high-temperature group and the low-temperature group extracted by the calculation module is 10% of the total data quantity;
when the control unit carries out coarse adjustment, the number of the high-temperature groups and the low-temperature groups extracted by the calculation module is 1.
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| CN201822246264.1U CN210004445U (en) | 2018-12-28 | 2018-12-28 | Boiler fresh air self-balancing adjusting equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519964A (en) * | 2018-12-28 | 2019-03-26 | 启明星宇节能科技股份有限公司 | Boiler fresh air self-balancing adjustment equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519964A (en) * | 2018-12-28 | 2019-03-26 | 启明星宇节能科技股份有限公司 | Boiler fresh air self-balancing adjustment equipment |
| CN109519964B (en) * | 2018-12-28 | 2023-12-01 | 启明星宇节能科技股份有限公司 | Boiler fresh air self-balancing adjusting equipment |
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