CN111322759A - Wall-mounted furnace capable of achieving staged combustion and control method thereof - Google Patents
Wall-mounted furnace capable of achieving staged combustion and control method thereof Download PDFInfo
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- CN111322759A CN111322759A CN202010150597.3A CN202010150597A CN111322759A CN 111322759 A CN111322759 A CN 111322759A CN 202010150597 A CN202010150597 A CN 202010150597A CN 111322759 A CN111322759 A CN 111322759A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a wall-mounted furnace capable of realizing sectional combustion and a control method thereof, wherein the wall-mounted furnace comprises a control main board and a combustor, and is characterized in that the combustor comprises a square pipe and a plurality of rows of combustion fire rows arranged on the square pipe, wherein each combustion fire row comprises a first fire row and a second fire row which are separately segmented, the first fire row and the second fire row are respectively and correspondingly provided with a sectional valve, and the square pipe is provided with two air inlets which respectively correspond to the sectional valves; the first fire row is provided with a group of ignition needles to enable a burner to ignite, a group of flame feedback needles are arranged between the first fire row and the second fire row to simultaneously detect and feed back flames of the first fire row and the second fire row and feed back flame signals, and switching of the segment valve is convenient to control. The invention can realize three-segment combustion on the basis of the general structure of the existing two-segment valve, the minimum combustion load can be smaller, and the minimum temperature rise can be reduced.
Description
Technical Field
The invention relates to the technical field of wall-mounted furnaces, in particular to a wall-mounted furnace capable of achieving staged combustion and a control method thereof.
Background
The atmospheric combustion mode of the existing wall-mounted furnace is generally a non-sectional combustion mode and a sectional combustion mode, and the control of the sectional combustion is generally realized by a plurality of sectional combustion corresponding to a plurality of sectional valves, for example, two sections need two stop sectional valves to realize, and three sections need three stop sectional valves to realize. However, the existing staged combustion mainly has the following problems: if two-segment combustion is adopted, the minimum combustion load cannot be minimized, the minimum temperature rise is limited, the phenomenon that the temperature of domestic hot water is too high and uncomfortable in summer at a small flow is caused, the water is easy to break when the segment proportion is set unreasonably, the water temperature fluctuation is large, the segment valve is frequently switched at the moment, and the service life of the segment valve is influenced; if three-subsection combustion is adopted, the minimum load can be smaller, but three subsection valve groups are needed to control subsection switching, the subsection control cost is increased, the structural change is large, the device is not convenient to use universally, and the investment cost is large.
As shown in fig. 1-2, the conventional two-segment burner has N rows of combustion rows, where N1 is the number of rows after individual segmentation, and N1 < N; the square tube of the burner comprises two air inlets which are respectively corresponding to the air inlet of a left segment valve and a right segment valve, wherein the fire row number N1 of the single segment corresponds to an air inlet interface of the segment valve; a group of ignition needles and flame feedback needles are contained in the fire row number N1 section which is independently segmented, so that the successful ignition and fire detection of the burner can be normally realized, and flame signals are fed back.
As shown in fig. 3, the load of the two-segment burner segment changes, and the combustion load of the single-row fire row of the general burner is Qmin at the minimum and Qmax at the maximum, i.e., [ Qmin, Qmax ]; in the same way, the combustion load intervals of the full-row N fire discharge and the half-row N1 fire discharge are respectively as follows: [ QN, min, QN, max ], [ QN1, min, QN1, max ]; in order to ensure that the burner is not shifted continuously, the minimum load of the full-row N load is required to be smaller than the maximum load of the half-row N1 load, namely QN and min are less than or equal to QN1 and max, and the load transition section is the area A shown in the figure. Therefore, the load change of the two-segment combustor is in [ QN1, min, QN, max ].
As shown in fig. 4, when the wall-hanging stove of the two-segment burner is operated to burn, if a certain hot water temperature is required, the burning control logic of the wall-hanging stove is as follows: the wall-mounted boiler is ignited after self-checking is carried out, the gas proportional valve is opened to admit gas, the wall-mounted boiler can be ignited by fully discharging N and also can be ignited by half discharging N1, after the wall-mounted boiler is ignited successfully, the control program judges according to the required hot water temperature and the inflow flow, and whether segmented combustion is carried out is determined. If the required combustion load is large, the fuel can be combusted in a non-sectional mode, the two sectional valves are fully opened, and the full-discharge N-row fire is stably combusted; if the required load is small, the half-row N1 can meet the load requirement by burning, namely, the two sectional valves are switched, the left sectional valve is closed, only the right sectional valve is opened, and the half-row N1 is burnt until the required hot water temperature is stable and the load is stably burnt.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide the wall-mounted furnace which can realize three-segment combustion on the basis of the approximate structure of the existing two-segment valve, the minimum combustion load can be reduced, the minimum temperature rise is reduced, the problem of overhigh temperature of domestic hot water under small flow in summer is solved, the problem of easy gear breakage caused by unreasonable two segments is avoided, and the cost for realizing the segment combustion is reduced.
The invention further provides a control method based on the wall-mounted furnace.
The invention adopts the following technical scheme to realize the purpose:
a wall-mounted furnace capable of achieving segmented combustion comprises a control main board and a combustor, and is characterized in that the combustor comprises a square pipe and a plurality of rows of combustion fire rows arranged on the square pipe, wherein each combustion fire row comprises a first fire row and a second fire row which are individually segmented, a segmented valve is respectively arranged on each of the first fire row and the second fire row in a corresponding mode, and two air inlets are formed in the square pipe and respectively correspond to one segmented valve; the first fire row is provided with a group of ignition needles which can ignite a burner, a group of flame feedback needles are arranged between the first fire row and the second fire row, and the flame feedback needles are in signal connection with the control main board, can simultaneously detect and feed back flames of the first fire row and the second fire row, feed back flame signals and are convenient for controlling the switching of the segment valves.
As a further explanation of the above solution, the number of rows of the first fire rows is less than the number of rows of the second fire rows.
Further, a baffle is arranged in the square pipe and separates the air inlet channel between the first fire grate and the second fire grate.
Furthermore, the flame feedback needle main body is bent and formed, one end of the main body corresponds to the output end of the first fire grate, and the other end of the main body corresponds to the output end of the second fire grate.
Further, the minimum load of the combustion fire row is less than the maximum load of the second fire row, and the minimum load of the second fire row is less than the maximum load of the first fire row.
A wall-hanging stove staged combustion control method comprises the following control steps:
1) starting the wall-mounted boiler, performing self-checking on the machine, and igniting after no fault exists;
2) after the ignition is successful, the control program judges according to the required hot water temperature and the water inlet flow, and determines whether to perform the sectional combustion: if the required combustion load is small, selecting a staged combustion working mode, and skipping to the step 3); if the required combustion load is large, selecting a non-segmented combustion working mode, and jumping to the step 6);
3) determining whether the required combustion load requires the supply of the minimum combustion load: if so, jumping to the step 4); if not, jumping to the step 5);
4) executing first fire row combustion control: after the burner is ignited, the left segment valve is closed, the right segment valve is kept open, the flame feedback needle can normally detect a combustion flame signal of the first fire grate and can feed back the signal to the main board control program to realize the combustion of the first fire grate until the temperature of the required hot water is stable and the load is stable;
5) executing second fire row combustion control: after the combustor is lighted, keep right segment valve to open, according to the load segmentation demand, open left segment valve, close right segment valve again after several seconds of delay, ensure that flame feedback needle can normally detect the burning flame signal that the second fire was arranged, can feed back signal to mainboard control program, realize that the second fire is arranged the burning, until demand hot water temperature is stable, the load stable combustion.
6) Executing full-emission combustion control: after the burner is lighted, the left subsection valve and the right subsection valve are opened simultaneously, the flame feedback needle can normally detect a combustion flame signal and can feed back the signal to the main board control program, and full-row N combustion is realized until the temperature of required hot water is stable and the load is stable.
The invention adopts the technical proposal to achieve the following beneficial effects:
1. on the basis of the two sectional valves, the three-sectional combustion of the first fire row combustion, the second fire row combustion and the full-row combustion is realized by controlling the combination of the sectional valve switches of the first fire row and the second fire row, and the sectional control cost is reduced.
2. Because the row number of arranging of first fire row is less than the row number of arranging of second fire row, first fire row promptly can provide minimum burning load, has reduced minimum load, realizes the hot water demand of low temperature rise under the little flow, has avoided because of the unreasonable phenomenon that leads to burning to cut off the shelves of segmentation design, has improved the life of segmentation valve.
Drawings
Fig. 1 is a schematic structural view of a conventional two-segment burner.
Fig. 2 is a schematic structural view of a conventional two-segment burner.
Fig. 3 is a graph showing a load change of a conventional two-segment type burner.
FIG. 4 is a schematic diagram of the control logic of a conventional two-stage combustor.
Fig. 5 is a schematic structural diagram of a burner provided by the present invention.
Fig. 6 is a schematic structural diagram of a burner provided by the present invention.
FIG. 7 is a graph of load variation for a combustor provided by the present invention.
FIG. 8 is a schematic diagram of the control logic for the combustor provided by the present invention.
Description of reference numerals: n, a combustion fire row, N1', a first fire row, N2, a second fire row, 1, a square tube, 1-1, a baffle, 2, a section valve, 3, an ignition needle, 4 and a flame feedback needle.
Detailed Description
The technical solution is described in detail with reference to specific embodiments below.
As shown in fig. 5-6, the invention is a wall-hanging stove with sectional combustion, which comprises a control main board and a burner, and is characterized in that the burner comprises a square pipe 1 and a plurality of rows of combustion fire rows N arranged on the square pipe, wherein each combustion fire row N comprises a first fire row N1' and a second fire row N2 which are separately segmented, the first fire row and the second fire row are respectively provided with a sectional valve 2 correspondingly, and the square pipe 1 is provided with two air inlets respectively corresponding to the sectional valves 2; the first fire row N1' is provided with a group of ignition needles 3 which can ignite a burner, a group of flame feedback needles 4 are arranged between the first fire row and the second fire row, the flame feedback needles are in signal connection with the control main board, and can simultaneously detect and feed back flames of the first fire row and the second fire row and feed back flame signals, thereby being convenient for controlling the switching of the segment valves.
Further, the number of rows of the first fire row N1' is less than the number of rows of the second fire row N2; a baffle plate 1-1 is arranged in the square tube 1 to separate an air inlet channel between the first fire grate and the second fire grate; the flame feedback needle 4 is formed by bending a main body, one end of the main body is arranged corresponding to the output end of the first fire grate, and the other end of the main body is arranged corresponding to the output end of the second fire grate; the minimum load of the combustion fire row N is less than the maximum load of the second fire row N2, and the minimum load of the second fire row N2 is less than the maximum load of the first fire row N1
A wall-hanging stove staged combustion control method comprises the following control steps:
1) starting the wall-mounted boiler, performing self-checking on the machine, and igniting after no fault exists;
2) after the ignition is successful, the control program judges according to the required hot water temperature and the water inlet flow, and determines whether to perform the sectional combustion: if the required combustion load is small, selecting a staged combustion working mode, and skipping to the step 3); if the required combustion load is large, selecting a non-segmented combustion working mode, and jumping to the step 6);
3) determining whether the required combustion load requires the supply of the minimum combustion load: if so, jumping to the step 4); if not, jumping to the step 5);
4) executing first fire row combustion control: after the burner is ignited, the left segment valve is closed, the right segment valve is kept open, the flame feedback needle can normally detect a combustion flame signal of the first fire grate and can feed back the signal to the main board control program to realize the combustion of the first fire grate until the temperature of the required hot water is stable and the load is stable;
5) executing second fire row combustion control: after the combustor is lighted, keep right segment valve to open, according to the load segmentation demand, open left segment valve, close right segment valve again after several seconds of delay, ensure that flame feedback needle can normally detect the burning flame signal that the second fire was arranged, can feed back signal to mainboard control program, realize that the second fire is arranged the burning, until demand hot water temperature is stable, the load stable combustion.
6) Executing full-emission combustion control: after the burner is lighted, the left subsection valve and the right subsection valve are opened simultaneously, the flame feedback needle can normally detect a combustion flame signal and can feed back the signal to the main board control program, and full-row N combustion is realized until the temperature of required hot water is stable and the load is stable.
In the practical application process, as shown in fig. 7, the load of the novel two-segment combustor is changed in segments, the minimum combustion load of the same combustor single row fire row is Qmin, and the maximum Qmax is [ Qmin, Qmax ]; similarly, the combustion load intervals of the combustion fire row N, the first fire row N1' and the second fire row N2 are respectively as follows: in order to ensure that the burner is segmented and is not shifted, [ QNmin, QNmax ], [ QN1 ' min, QN1 ' max ], [ QN2min, QN2max ] to ensure that the minimum load of the whole fire bank N is required to be smaller than the maximum load of the second fire bank N2 and the minimum load of the second fire bank N2 is required to be smaller than the maximum load of the first fire bank N1 ', namely QNmin is less than or equal to QN2 max; QN2min is less than or equal to QN 1' max, and the load transition sections are respectively in the region C, B shown in the figure. The load variation of the three-segment burner segment is in [ QN 1' min, QNmax ]. Compared with the existing two-segment combustor, N1 'is smaller than N1, namely QN 1' min is smaller than QN1min, so that the minimum load is reduced.
As shown in fig. 8, the combustion control logic of the novel two-segment combustor for realizing three-segment combustion is as follows: if the domestic hot water requires a certain hot water temperature, the wall-mounted boiler is self-checked and ignited after no fault, the gas proportional valve is opened to admit gas, and the ignition of the wall-mounted boiler can be performed by full-row N ignition or half-row N1'. After the ignition is successful, the control program judges according to the required hot water temperature and the water inlet flow, and determines whether to perform the sectional combustion. If the required combustion load is large, the fuel can be combusted in a non-sectional mode, the two sectional valves are fully opened, and the full-discharge N-row fire is stably combusted; if the demand load is low, half row N1 ' or the other half row N2 can be selected for combustion, specifically half row QN1 ', min < QN2, min, i.e., half row N1 ' can provide the minimum combustion load and reduce the minimum temperature rise.
Because only two section valves are arranged, the same flame feedback needle controls the section modes in the process of realizing three sections (N1', N2, N) as follows:
1. half-rank N1' combustion control: after the burner is ignited, the left segment valve is closed, the right segment valve is kept to be opened, the feedback needle can normally detect a combustion flame signal of the half-row N1 ', a signal can be fed back to a main board control program, and the half-row N1' is combusted until the temperature of required hot water is stable and the load is stable.
2. Half bank N2 combustion control: after the combustor is lighted, keep right segment valve to open, according to the load segmentation demand, open left segment valve, close right segment valve again after several seconds of delay, ensure that the feedback needle can normally detect half row N2's burning flame signal, can feedback signal to mainboard control program, realize half row N2 burning, until demand hot water temperature is stable, the load is stably burnt.
3. And (3) full-row N combustion control: after the burner is lighted, the left segment valve and the right segment valve are opened simultaneously, the feedback needle can normally detect a burning flame signal and feed back the signal to a main board control program, and full-row N burning is realized until the temperature of required hot water is stable and the load is stable.
Example one
In the present embodiment, 12 rows are set for the full row, and 0.8kW and 2kW are set for the minimum and maximum combustion loads of the single row fire, respectively;
the current two subsections can be selected from 6/6 subsections or 7/5 subsections, and the corresponding load change interval is (4.8, 24) or (4.0, 24); wherein the load A transition section of the 6/6 subsection is [ 9.6,12 ], and the load transition section is 2.4kW more surplus without gear break; and the load A transition section of the 7/5 subsection is 9.6,10, and the load transition section is only 0.4kW, so that the control is difficult and the gear breaking is easy. Namely, the preferable segment of the full row of 12 rows is 6/6 segments, and the combustion load interval is [ 4.8,24 ].
If two-section valve and three-section control are adopted: 7/5 subsections or 8/4 subsections can be selected as the original two subsections, and the corresponding combustion load change interval is [ 4.0,24 ] or [ 3.2,24 ]; wherein, the load B, C transition section intervals of the 7/5 segments are respectively [ 5.6,10 ] and [ 9.6,14 ], the load B, C transition section intervals of the 8/4 segments are respectively [ 6.4,8 ] and [ 9.6,12 ], and the load transition sections are more abundant. Compared with 8/4 sections, the minimum load is smaller, namely the three-section optimization, and the combustion load interval is [ 3.2,24 ].
Compared with the minimum load of 4.8kW of the original two sections, the minimum load is reduced to 3.2kW, and the minimum load is reduced by 33.3% (1.6 kW).
Compared with the existing two-segment combustor, the invention is changed on the basis of the existing two segments to realize three-segment combustion, and the number of fire rows of the novel segmented half-row N1' which is less than the number of fire rows of the original half-row N1 is reduced to realize the minimum load reduction; the same group of ignition needles and flame feedback needles are shared, the structure of the feedback needles is changed, but the feedback needles can simultaneously monitor and feedback combustion flame signals on the left side and the right side of the segment; the switching of the half-row N2 staged combustion is to switch the full-row N combustion first, then close the right-side staged valve after stabilizing for several seconds, and keep the staged valve open to realize the half-row N2 combustion.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (6)
1. A wall-mounted furnace capable of achieving segmented combustion comprises a control main board and a combustor, and is characterized in that the combustor comprises a square pipe and a plurality of rows of combustion fire rows arranged on the square pipe, wherein each combustion fire row comprises a first fire row and a second fire row which are individually segmented, a segmented valve is respectively arranged on each of the first fire row and the second fire row in a corresponding mode, and two air inlets are formed in the square pipe and respectively correspond to one segmented valve; the first fire row is provided with a group of ignition needles which can ignite a burner, a group of flame feedback needles are arranged between the first fire row and the second fire row, and the flame feedback needles are in signal connection with the control main board and can simultaneously detect and feed back flames of the first fire row and the second fire row and feed back flame signals.
2. The staged combustion wall hanging stove according to claim 1, wherein the number of rows of the first fire row is smaller than the number of rows of the second fire row.
3. The staged combustion wall hanging stove according to claim 1, wherein a baffle is provided in the square tube to separate the air intake passage between the first fire row and the second fire row.
4. The staged combustion wall hanging stove as claimed in claim 1, wherein the flame feedback needle body is formed by bending, and one end of the flame feedback needle body is disposed corresponding to the output end of the first fire row, and the other end of the flame feedback needle body is disposed corresponding to the output end of the second fire row.
5. The staged combustion wall hanging stove according to claim 1, wherein the minimum load of the combustion fire row is less than the maximum load of the second fire row, and the minimum load of the second fire row is less than the maximum load of the first fire row.
6. A staged combustion method for a wall-hanging stove corresponding to the staged combustion wall-hanging stove of any one of claims 1 to 5, wherein the staged combustion method comprises the following control steps:
1) starting the wall-mounted boiler, performing self-checking on the machine, and igniting after no fault exists;
2) after the ignition is successful, the control program judges according to the required hot water temperature and the water inlet flow, and determines whether to perform the sectional combustion: if the required combustion load is small, selecting a staged combustion working mode, and skipping to the step 3); if the required combustion load is large, selecting a non-segmented combustion working mode, and jumping to the step 6);
3) determining whether the required combustion load requires the supply of the minimum combustion load: if so, jumping to the step 4); if not, jumping to the step 5);
4) executing first fire row combustion control: after the burner is ignited, the left segment valve is closed, the right segment valve is kept open, the flame feedback needle can normally detect a combustion flame signal of the first fire grate and can feed back the signal to the main board control program to realize the combustion of the first fire grate until the temperature of the required hot water is stable and the load is stable;
5) executing second fire row combustion control: after the combustor is lighted, keep right segment valve to open, according to the load segmentation demand, open left segment valve, close right segment valve again after several seconds of delay, ensure that flame feedback needle can normally detect the burning flame signal that the second fire was arranged, can feed back signal to mainboard control program, realize that the second fire is arranged the burning, until demand hot water temperature is stable, the load stable combustion.
6) Executing full-emission combustion control: after the burner is lighted, the left subsection valve and the right subsection valve are opened simultaneously, the flame feedback needle can normally detect a combustion flame signal and can feed back the signal to the main board control program, and full-row N combustion is realized until the temperature of required hot water is stable and the load is stable.
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| CN202010150597.3A CN111322759A (en) | 2020-03-06 | 2020-03-06 | Wall-mounted furnace capable of achieving staged combustion and control method thereof |
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| CN202010150597.3A CN111322759A (en) | 2020-03-06 | 2020-03-06 | Wall-mounted furnace capable of achieving staged combustion and control method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111322760A (en) * | 2020-03-06 | 2020-06-23 | 万家乐热能科技有限公司 | Wall-mounted furnace capable of expanding combustion load ratio and control method thereof |
| CN111981698A (en) * | 2020-08-17 | 2020-11-24 | 海信(广东)厨卫***有限公司 | Gas water heater and control method thereof |
| CN112577205A (en) * | 2020-12-15 | 2021-03-30 | 珠海格力电器股份有限公司 | Burner subsection switching control method and device of heat supply equipment and heat supply equipment |
| CN113898949A (en) * | 2021-10-18 | 2022-01-07 | 东莞市艾瑞科热能设备有限公司 | Balanced control method of sectional type combustor, combustor and wall-mounted furnace |
| CN113898948A (en) * | 2021-10-18 | 2022-01-07 | 东莞市艾瑞科热能设备有限公司 | Staged combustion balance control method for combustor, combustor and wall-hanging stove |
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