CN114353332B - Atmospheric combustion low-nitrogen wall-mounted furnace - Google Patents
Atmospheric combustion low-nitrogen wall-mounted furnace Download PDFInfo
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- CN114353332B CN114353332B CN202111242547.9A CN202111242547A CN114353332B CN 114353332 B CN114353332 B CN 114353332B CN 202111242547 A CN202111242547 A CN 202111242547A CN 114353332 B CN114353332 B CN 114353332B
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Abstract
The invention discloses an atmospheric combustion low-nitrogen wall-mounted furnace which is characterized by comprising a smoke collecting hood assembly, a heat exchanger, a heating water outlet pipe assembly, a heating water inlet pipe assembly, a water inlet valve assembly, a main controller, a sectional fuel gas proportional valve, a heating water return pipe fitting, a circulating water pump, an air inlet pipe assembly, an atmospheric combustion low-nitrogen burner, an upper-pumping direct-current fan and an ignition needle assembly; the upper direct current suction fan is fixed in the fume collecting hood assembly, and the main controller is connected with the upper direct current suction fan; the heat exchanger is arranged below the fume collecting hood assembly, and water heated by the heat exchanger flows out through the heating water outlet pipe assembly; the ignition needle component is of a three-needle integrated structure, is arranged on the outer side of the atmospheric combustion low-nitrogen burner, and has the functions of ignition and flame feedback. The invention has simple structure, better cost performance, easy control and relatively low technical requirement.
Description
Technical Field
The invention relates to the technical field of wall-mounted furnaces, in particular to an atmospheric combustion low-nitrogen wall-mounted furnace.
Background
The existing low-nitrogen wall-mounted furnaces have three types: the first is to use the water-cooling copper low-nitrogen combustion technology to achieve low NOx emission, but the cost of the burner is high, so that the whole machine is high in cost and has no competitive advantage; the second is to use a full premix burner to control the combustion air-fuel ratio, but the full premix burner has high technical requirements on full premix control, high requirements on air source component difference and high cost investment, and has high after-market technical support requirements; the third is the thick-thin burner technology adopting the water heater structure, which can achieve low NOx emission, but has larger difference with the European hanging stove structure, poorer endurance stability, difficult control and less application in the existing hanging stove industry.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides the atmospheric combustion low-nitrogen wall-mounted furnace which is simple in structure, better in cost performance, easy to control, relatively low in technical requirement and reliable.
The invention adopts the following technical proposal to realize the aim: the atmospheric combustion low-nitrogen wall-mounted furnace is characterized by comprising a smoke collecting hood assembly, a heat exchanger, a heating water outlet pipe assembly, a heating water inlet pipe assembly, a water inlet valve assembly, a main controller, a sectional fuel gas proportional valve, a heating water return pipe fitting, a circulating water pump, an air inlet pipe assembly, an atmospheric combustion low-nitrogen burner, an upper-pumping direct-current fan and an ignition needle assembly; the heating water inlet pipe assembly and the heating water outlet pipe assembly are respectively connected to the input end and the output end of the heat exchanger, the water inlet valve assembly is arranged on the water inlet pipe assembly, the heating water return pipe fitting is connected with the circulating water pump, and the sectional fuel gas proportional valve is connected with the air inlet end of the atmospheric combustion low-nitrogen burner through the air inlet pipe assembly.
The upper DC suction fan is fixed in the fume collecting hood assembly, the main controller is connected with the upper DC suction fan, and the upper DC suction fan can realize the speed regulation function according to different provided voltages.
The heat exchanger is arranged below the fume collecting hood assembly, so that heat after combustion of the burner is conveniently transferred to water in the inner pipeline through fins on the surface of the heat exchanger, the water is circularly heated, and the heated water flows out through the heating water outlet pipe assembly.
The ignition needle component is of a three-needle integrated structure, is arranged on the outer side of the atmospheric combustion low-nitrogen burner and has the functions of ignition and flame feedback; the double-needle ignition is performed, so that the damage of high-frequency discharge to the burner is avoided; the one-needle fire detection feedback is designed to span two adjacent rows of fire detection feedback to improve the fire detection power in order to improve the reality and reliability of the combustion flame feedback.
As a further explanation of the scheme, the atmospheric combustion low-nitrogen burner adopts an atmospheric C-shaped fire row combustion structure, single nozzles are used for guiding premixing, the combustion of each fire row comprises thick combustion and thin combustion, the middle of the fire row is thin flame combustion, and the adjacent edge area of the fire row is thick flame combustion, so that low-nitrogen combustion is realized.
Further, the air flow organization mesh plate is distributed at the bottom of the atmospheric combustion low-nitrogen burner, so that secondary air is conveniently reduced, primary air premixing capability is improved, and the height of combustion flame is shortened.
Further, the upper suction direct current fan is provided with a fan control connecting port, the fan control connecting port is connected with the main controller, voltage control given by the main controller is combined with a current value and a gas flow opening of the segmented gas proportional valve, variable-frequency speed-regulating combustion control is realized, a rotating speed running value of the fan is fed back to a built-in theoretical value of a main board in real time, comparison and analysis are carried out, whether the fan runs normally is judged, whether a smoke discharging system and a combustion system of the low-nitrogen wall-mounted furnace are normal or not is further fed back, and if abnormal, an alarm is given, a wall-mounted furnace wind pressure continuity monitoring function is provided, wind pressure monitoring parts such as a wall-mounted furnace wind pressure switch or a wind pressure sensor are replaced, control cost is reduced, and reliability is improved.
Further, the heating water outlet pipe assembly is connected with a water outlet valve assembly, the water outlet valve assembly is provided with a three-way switching motor, the water outlet valve assembly is connected with a plate heat exchanger, and heated water flows out through the heating water outlet pipe assembly; after flowing through the water outlet valve assembly, the main controller controls the three-way motor to switch water flow according to the water demand of a user, so that the heating water function is realized or the water flows through the plate heat exchanger again to heat the water inlet of the bathroom, the domestic hot water function is provided, and after heat exchange, the water flows back to the circulating water pump and the heating water return pipe fitting, and then the water is circularly heated again in the heat exchanger.
Further, the upper suction direct current fan comprises a fan connecting plate, so that the upper suction direct current fan is convenient to fix in the fume collecting hood assembly.
The beneficial effects achieved by adopting the technical proposal of the invention are that.
1. The invention adopts a low-nitrogen wall-mounted furnace structure which mainly comprises a smoke collecting hood component, a heat exchanger, a heating water outlet pipe component, a heating water inlet pipe component, a water inlet valve component, a main controller, a sectional fuel gas proportional valve, a heating water return pipe fitting, a circulating water pump, an air inlet pipe component, an atmospheric combustion low-nitrogen burner, an upper-pumping direct-current fan and an ignition needle component, wherein the combustion load is matched with the air quantity required by the real-time control combustion, the variable-frequency speed combustion is realized, the CO emission content is less than 600ppm, the atmospheric C-type premixing low-nitrogen burner is applied, the rich-lean combustion is combined, the NOx emission content is less than 50mg/kw.h, and the 5-level NOx emission standard of the wall-mounted furnace is achieved, and the low-nitrogen emission is realized.
2. The low-nitrogen wall-mounted furnace adopted by the invention has the advantages of replacing a copper water-cooled low-nitrogen burner, canceling a wind pressure switch, adopting a fan for continuous wind pressure monitoring, and being resistant, reliable and strong; an integrated ignition feedback needle is applied to improve the ignition power; by means of the sectional combustion technology, heating and bathing double-sectional control adjustment is achieved, the minimum load of the low-nitrogen wall-mounted furnace is smaller, and water temperature comfort level is high.
Drawings
Fig. 1 is a schematic exploded view of the present invention.
Fig. 2 is a schematic structural view of the present invention.
Fig. 3 is a schematic view of the structure of the ignition needle assembly.
FIG. 4 is a schematic view of an atmospheric combustion low nitrogen burner.
Fig. 5 is an enlarged view of a in fig. 4.
FIG. 6 is a schematic view of an atmospheric combustion low nitrogen burner.
Fig. 7 is a schematic diagram of the structure of the upward-pumping direct-current fan.
Reference numerals illustrate: 1. the smoke collecting hood comprises a smoke collecting hood assembly 2, a heat exchanger 3, a heating water outlet pipe assembly 4, a heating water inlet pipe assembly 5, a water inlet valve assembly 6, a main controller 7, a sectional fuel gas proportional valve 8, a heating water return pipe fitting 9, a circulating water pump 10, an air inlet pipe assembly 11, an atmospheric combustion low-nitrogen burner 11-1, a fire exhaust 11-11, a thick combustion 11-12, a light combustion 11-2, an airflow organization net plate 12, an up-draft direct current fan 12-1, a fan control connecting port 13, an ignition needle assembly 14, a sealing bottom plate 15, an insulating plate 16, a combustion chamber cover plate 17 and a plate heat exchanger.
Detailed Description
In the description of the present invention, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present invention that the device or element referred to must have a specific azimuth configuration and operation.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first", "a second" feature may explicitly or implicitly include one or more of such features, and in the description of the invention, "at least" means one or more, unless clearly specifically defined otherwise.
In the present invention, unless explicitly stated and limited otherwise, the terms "assembly," "connected," and "coupled" are to be construed broadly, e.g., as fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; can be directly connected or connected through an intermediate medium, and can be communicated with the inside of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless specified and limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "below," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply representing the first feature as having a higher level than the second feature. The first feature being "above," "below," and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or simply indicating that the first feature is level below the second feature.
The following description of the specific embodiments of the present invention is further provided with reference to the accompanying drawings, so that the technical scheme and the beneficial effects of the present invention are more clear and definite. The embodiments described below are exemplary by referring to the drawings for the purpose of illustrating the invention and are not to be construed as limiting the invention.
As shown in fig. 1-7, the invention relates to an atmospheric combustion low-nitrogen wall-mounted furnace, which comprises a fume collecting hood assembly 1, a heat exchanger 2, a heating water outlet pipe assembly 3, a heating water inlet pipe assembly 4, a water inlet valve assembly 5, a main controller 6, a sectional fuel gas proportional valve 7, a heating water return pipe fitting 8, a circulating water pump 9, an air inlet pipe assembly 10, an atmospheric combustion low-nitrogen burner 11, an upper suction direct-current fan 12, an ignition needle assembly 13 and a sealing bottom plate 14. The atmospheric combustion low nitrogen burner 11 is arranged in a combustion chamber, the front surface of the combustion chamber is provided with an opening, and the opening is provided with an insulating plate 15 and a combustion chamber cover plate 16.
The upper suction direct current fan comprises a fan connecting plate, so that the upper suction direct current fan is conveniently fixed in the fume collecting hood assembly, the upper suction direct current fan can realize a speed regulating function according to different voltages provided by the main board, and the fume collecting hood collects high-temperature fume after heat exchange of the heat exchanger, so that the fan is conveniently discharged; the heat exchanger is arranged below the fume collecting hood assembly, so that heat after combustion of the burner is conveniently transferred to water in the inner pipeline through fins on the surface of the heat exchanger, the water is circularly heated, and the heated water flows out through the heating water outlet pipe assembly; after the water flows through the water outlet valve to be assembled, the main board controls the three-way motor to switch water flow according to the water demand of a user, so that the heating water function is realized or the water flows through the plate heat exchanger 17 again to heat the water inlet of the bathroom, the domestic hot water function is provided, the water flows back to the circulating water pump after heat exchange, and the heating water return pipe is assembled and then is circularly heated again in the heat exchanger. The main board matches the corresponding current of the sectional fuel gas proportional valve according to the deviation between the detected pipeline water temperature and the target temperature of the user, controls the opening degree of the fuel gas valve, and realizes the large-load and small-load combustion by combining with the burner. During combustion, the current value of the main control proportional valve is matched and combined with the speed regulation wind pressure value of the control upper DC draught fan, so that the air quantity required by combustion under different loads is mutually adjusted and matched, the poor combustion working conditions such as flame separation and tempering caused by unmatched air quantity during combustion are avoided, and the low-nitrogen combustor is ensured to burn with low NOx and CO in real time.
The ignition needle component of the low-nitrogen wall-mounted furnace is an ignition feedback needle with a three-needle integrated structure, is arranged on the cover plate of the combustion chamber, and has the functions of ignition and flame feedback; the double-needle ignition is performed, so that the damage of high-frequency discharge to the burner is avoided; the one-needle fire detection feedback is designed to span two adjacent rows of fire detection feedback in order to improve the reality and reliability of the combustion flame feedback.
The burner of the low-nitrogen wall-mounted furnace adopts an atmospheric C-shaped fire-exhaust combustion structure, and a single nozzle is provided with premixing; the space between the combustion surfaces of the fire rows is smaller in structural design, the combustion area is enlarged, the combustion similar to the flat plate type combustion surface is formed, the combustion of each fire row 11-1 consists of thick combustion 11-11 and thin combustion 11-12, the fire row is provided with a fire cover specific structural design, the middle of the fire row is thin flame combustion, and the adjacent edge area of the fire row is thick flame combustion, so that low-nitrogen combustion is realized; the air flow organization blending net plate 11-2 is distributed at the bottom of the burner, so that secondary air is reduced, primary air premixing capability is improved, and the height of combustion flame is shortened. Furthermore, the combustion area of the burner is increased, so that the heat intensity of a unit area is reduced, and the reduction of the production amount of NOx is directly influenced; in order to ensure the heat exchange efficiency with the heat exchanger, the heat exchange distance between the combustion surface and the heat exchanger is shortened, so that the volume of the combustion chamber in the wall-mounted boiler is reduced compared with that of a common wall-mounted boiler, the high-temperature flue gas discharging efficiency is accelerated, the residence time is shortened, the conversion amount of NOx is reduced indirectly, and the effect of low nitrogen emission is further realized.
The upper-drawing direct current speed regulation fan of the low-nitrogen wall-mounted furnace is provided with a fan control connecting port 12-1, is connected with a main board of a main controller, is controlled by voltage given by the main board, is combined with a current value and a gas flow opening of a main board control proportional valve, realizes variable-frequency speed regulation combustion control, feeds back a rotating speed running value of the fan to a built-in theoretical value of the main board in real time, performs comparison and analysis, judges whether the fan runs normally, further feeds back whether a smoke discharging system and a combustion system of the low-nitrogen wall-mounted furnace are normal, gives an alarm if abnormal, has a wall-mounted furnace wind pressure continuity monitoring function, replaces wind pressure monitoring parts such as a wall-mounted furnace wind pressure switch or a wind pressure sensor, reduces control cost and improves reliability.
In this embodiment, heating inlet tube subassembly and heating outlet pipe subassembly are connected respectively in heat exchanger's input and output, and inlet valve subassembly sets up on the inlet tube subassembly, and heating return water pipe fitting is connected with circulating water pump, and sectional gas proportional valve passes through the inlet tube subassembly and is connected with the air inlet end of atmospheric combustion low nitrogen combustor.
Compared with the prior art, the novel atmospheric stainless steel low-nitrogen burner is combined with the upper-pumping direct-current speed regulation fan, the air quantity required by combustion is controlled in real time according to the combustion load of the high-nitrogen low-nitrogen burner, the CO emission content is less than 600ppm, the NOx emission content is less than 50mg/kw.h, the 5-level NOx emission standard of the wall-mounted furnace is achieved, the low-nitrogen wall-mounted furnace has the advantages of higher cost, no wind pressure switch, high durability and stability, and the heating and bathing double-sectional control and regulation are adopted, so that the minimum load of the low-nitrogen wall-mounted furnace is smaller, and the water temperature comfort level is high.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which falls within the scope of the present invention.
Claims (5)
1. The atmospheric combustion low-nitrogen wall-mounted furnace is characterized by comprising a smoke collecting hood assembly, a heat exchanger, a heating water outlet pipe assembly, a heating water inlet pipe assembly, a water inlet valve assembly, a main controller, a sectional fuel gas proportional valve, a heating water return pipe fitting, a circulating water pump, an air inlet pipe assembly, an atmospheric combustion low-nitrogen burner, an upper-pumping direct-current fan and an ignition needle assembly; the heating water inlet pipe component and the heating water outlet pipe component are respectively connected with the input end and the output end of the heat exchanger, the water inlet valve component is arranged on the water inlet pipe component, the heating water return pipe fitting is connected with the circulating water pump, the sectional fuel gas proportional valve is connected with the air inlet end of the atmospheric combustion low nitrogen burner through the air inlet pipe component,
the upper direct current extraction fan is fixed in the fume collecting hood assembly, the main controller is connected with the upper direct current extraction fan, and the upper direct current extraction fan can realize a speed regulation function according to different provided voltages;
the heat exchanger is arranged below the fume collecting hood assembly, and water heated by the heat exchanger flows out through the heating water outlet pipe assembly;
the ignition needle component is of a three-needle integrated structure, is arranged on the outer side of the atmospheric combustion low-nitrogen burner and has the functions of ignition and flame feedback; the double-needle ignition is performed, so that the damage of high-frequency discharge to the burner is avoided; the fire detection feedback is designed to span two adjacent rows in order to improve the reality and reliability of the fire detection feedback;
the upper suction direct current fan comprises a fan connecting plate, and the fume collecting hood collects high-temperature fume after heat exchange of the heat exchanger, so that the fan is convenient to discharge; according to the water demand of a user, the main board controls the three-way motor to switch water flow, so that the heating water function is realized or the water flows through the plate heat exchanger again to heat the bathroom water inlet, the domestic hot water function is provided, the water flows back to the circulating water pump after heat exchange, and the heating water return pipe is assembled and then is circularly heated again in the heat exchanger; the main board matches the corresponding current magnitude of the sectional fuel gas proportional valve according to the deviation between the detected pipeline water temperature and the target temperature of the user, controls the magnitude opening of the fuel gas valve, and realizes the magnitude load combustion in combination with the burner; during combustion, the current value of the main control proportional valve is matched and combined with the speed regulation wind pressure value of the upper suction direct current fan, so that the air quantity required by combustion under different loads is mutually adjusted and matched, and the low-nitrogen combustor is ensured to burn low NOx and CO in real time.
2. The atmospheric combustion low-nitrogen wall-mounted furnace according to claim 1, wherein the atmospheric combustion low-nitrogen burner adopts an atmospheric C-shaped fire grate combustion structure, premixing is arranged in a single nozzle, combustion of each fire grate comprises thick combustion and thin combustion, the middle of the fire grate is thin flame combustion, and the adjacent edge area of the fire grate is thick flame combustion.
3. The atmospheric combustion low-nitrogen wall-mounted furnace according to claim 1, wherein an air flow organization deployment net plate is distributed at the bottom of the atmospheric combustion low-nitrogen burner.
4. The atmospheric combustion low-nitrogen wall-mounted furnace according to claim 1, wherein the upper-pumping direct-current fan is provided with a fan control connection port, the fan control connection port is connected with a main controller, voltage control is given by the main controller, the fan control connection port is combined with a current value and a gas flow opening of a sectional gas proportional valve, variable-frequency speed-regulating combustion control is realized, a rotating speed running value of the fan is fed back to a built-in theoretical value of a main board in real time, comparison and analysis are carried out, whether the fan is normal is judged, whether a smoke discharging system and a combustion system of the low-nitrogen wall-mounted furnace are normal is further fed back, and an alarm is given if the smoke discharging system and the combustion system are abnormal.
5. The atmospheric combustion low nitrogen wall-mounted boiler according to claim 1, wherein the heating water outlet pipe assembly is connected with a water outlet valve assembly, the water outlet valve assembly is provided with a three-way switching motor, and the water outlet valve assembly is connected with a plate heat exchanger; the main controller is connected with the three-way motor to switch water flow, so that the heating water function is realized or the water flows through the plate heat exchanger again to heat the water inlet of the bathroom, flows back to the circulating water pump after heat exchange and is circularly heated again in the heat exchanger after the water flows back to the heating backwater pipe fitting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111242547.9A CN114353332B (en) | 2021-10-25 | 2021-10-25 | Atmospheric combustion low-nitrogen wall-mounted furnace |
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| CN202111242547.9A CN114353332B (en) | 2021-10-25 | 2021-10-25 | Atmospheric combustion low-nitrogen wall-mounted furnace |
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| CN114353332B true CN114353332B (en) | 2023-09-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504485A (en) * | 2017-09-21 | 2017-12-22 | 广东万和新电气股份有限公司 | Shade burner |
| CN207006358U (en) * | 2017-07-12 | 2018-02-13 | 浙江双菱戴纳斯帝电气有限公司 | Wall-hung boiler igniter with functions of flame detection |
| CN212253131U (en) * | 2020-05-08 | 2020-12-29 | 浙江昂科拉热能科技有限公司 | Airflow distribution type low-nitrogen emission variable-frequency wall-mounted furnace |
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2021
- 2021-10-25 CN CN202111242547.9A patent/CN114353332B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207006358U (en) * | 2017-07-12 | 2018-02-13 | 浙江双菱戴纳斯帝电气有限公司 | Wall-hung boiler igniter with functions of flame detection |
| CN107504485A (en) * | 2017-09-21 | 2017-12-22 | 广东万和新电气股份有限公司 | Shade burner |
| CN212253131U (en) * | 2020-05-08 | 2020-12-29 | 浙江昂科拉热能科技有限公司 | Airflow distribution type low-nitrogen emission variable-frequency wall-mounted furnace |
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| CN114353332A (en) | 2022-04-15 |
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